US20090092444A1 - Double-bladed vibrating concrete screed - Google Patents
Double-bladed vibrating concrete screed Download PDFInfo
- Publication number
- US20090092444A1 US20090092444A1 US12/315,419 US31541908A US2009092444A1 US 20090092444 A1 US20090092444 A1 US 20090092444A1 US 31541908 A US31541908 A US 31541908A US 2009092444 A1 US2009092444 A1 US 2009092444A1
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- Prior art keywords
- screed
- blade
- hand side
- concrete
- arm
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- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000007790 scraping Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- -1 for example Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 239000011395 ready-mix concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
- E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
- E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
- E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
- E01C19/40—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers
- E01C19/405—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers with spreading-out, levelling or smoothing means other than the tamping or vibrating means for compacting or smoothing, e.g. with screws for spreading-out the previously dumped material, with non-vibratory lengthwise reciprocated smoothing beam
Definitions
- the present invention is related to an apparatus for leveling concrete. More particularly, the present invention is directed to leveling concrete in an area between two forms for retaining poured concrete.
- the present invention is a double-bladed vibrating concrete screed for leveling poured concrete within a form, such as a driveway. Concrete is often poured from a chute at the back of a concrete truck or through a hose or nozzle. Although the chute or hose can be moved about to some extent, the concrete is invariably not level when poured and must be subsequently leveled before setting. In many applications, the leveling is carried out by a hand tool known as a screed that a worker drags across the concrete.
- the present invention is designed to reduce the labor needed for this operation by providing a screed that can be attached to a front loader, excavator, or the like which can control the elevation of the screed and drag it back and forth across the concrete, thereby leveling the concrete more quickly and easily.
- U.S. Pat. No. 7,121,762 B2 issued to Quenzi et al. on Oct. 17, 2006, discloses an Apparatus for Screening Uncured Concrete Surfaces, comprising a screeding device having a primary screed member, or vibratory beam that is mounted to a framework.
- the device includes a strike-off plow, which strikes the concrete before the vibratory beam. This device is pulled by a user as he walks backward
- U.S. Patent Application Publication Number US 2005/0265786 A1 describing an invention by Gresser et al. and published on Dec. 1, 2005, discloses a Method and Apparatus for Leveling Spreadable Material, comprising a screed member supported by a pair of parallel rails that are rigidly is attached to the bucket of a front loader through a pair of receiving sleeves attached to the bucket.
- the actual screed is supported by a pair of ski-like skids that rest on the ground or other substrate that must be moved through the material being graded.
- the screed arms have some up-and-down adjustment relative to the skids, there appears to be none where the arms are attached to the bucket of a front loader.
- U.S. Pat. No. 6,203,244 B1 issued to Van Ornum on Mar. 20, 2001, discloses a Screeding Apparatus, comprising a screed blade connected to a rear edge of a square frame that is supported by casters near the end opposite from the screed blade and having a fitting along the rear edge for receiving the prongs of a front loader or the like, which pulls the screed blade across concrete or the like. Since the casters ride on the ground, the screed will cause the material that is spread to have a surface contour related to the contour of the ground.
- U.S. Pat. No. 6,022,171 B1 discloses an Apparatus and Method for Preparing a Site and Finishing Poured Concrete, comprising a concrete finishing device 24 attached to the front of a motorized vehicle 20 ( FIG. 1 ).
- the concrete finishing device includes first and second vibrating floats.
- a screed plate comprises a first screed plate in the concrete finishing device, which comprises a second screed blade located and attached forward of the vibrating floats and they will push the material during fine grading.
- U.S. Pat. No. 5,567,075 B1 issued to Allen on Oct. 22, 1996, discloses an Offset Screed System and Quick Connect Mounting Therefore, comprising a triangular truss frame 40 with a leading strike-off member for scraping off excess concrete followed by an identically shaped float, both of which are formed from angle iron or the like, with the leading strike-off member leading with its horizontal edge, while the float member leads with its vertical face.
- Vibrators are used to vibrate discrete and may be driven by a conventional motor driving the eccentrically weighted shaft 45 or by pneumatic or electric vibrators (column 6, lines 13-23).
- the device comprises a pair of opposed vertically oriented and rearwardly converging side plates disposed between the two side plates lies a vertically disposed rectangular plate which serves as the screed.
- U.S. Pat. No. 5,129,803 B1 issued to Normura et al. on Jul. 14, 1992, discloses a Concrete Leveling Machine, comprising a motor vehicle having a drive system that pulls a leveling unit. The wheels of the motor vehicle are designed to ride on the reenforcing bar for the concrete.
- the leveling unit includes an elongated leveling augur, a leveling plate and a tamper.
- the tamper is supported by two tamper support rods attached to the level of platform.
- the support rod is forced down with a coil compression spring.
- a tamper motor causes the tamper to shake up and down.
- the screed is illustrated as being convex from bottom to top in the direction of travel and being physically higher than the tamper, although this appears not to be discussed in the verbal specification.
- U.S. Pat. No. 5,039,249 B1 issued to Hansen et al. on Aug. 13, 1991, discloses an Apparatus for Screening (sic; it should read Screeding) and Trowelling Concrete, comprising telescopic boom attached to a motor vehicle located away from the poured concrete.
- a screed attachment includes screed blade and a concrete float that is connected to a support member that is connected to two lifting rods. This entire assembly is connected to the boom.
- the screed blade is convex from top to bottom relative to the direction of travel, that is, is shaped like a short snow plow blade
- U.S. Pat. No. 4,995,760 B1 issued to Probst et al. on Feb. 26, 1991, discloses a Scraping Device for Making a Subgrade, comprising a scraper blade connected to a bucket for accumulating grade material, for example, sand, as they scraper is dragged across a pair of parallel rails set at the desired grade level.
- grade material for example, sand
- U.S. Pat. No. 4,685,826 B1 issued to Allen on Aug. 11, 1987, discloses a Vibratory Screed Including a Laterally Displaceable Oscillating Strike-Off, comprising a self-contained hydraulic system for vibrating a strike-off attachment ( FIG. 16 ) of a vibratory screed.
- the apparatus includes front and rear screed blades, both of which are flat, making them actually floats rather than screeds. This device is vibrated by the gasoline engine apparatus mounted on top of the apparatus.
- U.S. Pat. No. 3,786,997 B1 issued to Viner on Jan. 22, 1974 discloses an Apparatus for Removing Unused Concrete, that is used for reclaiming ready-mix concrete that is left over after a job.
- the excess concrete is poured into a shallow form, allow to set and is then crushed by advancing a curved blade on a front end loader.
- the resulting debris can be used as aggregate and additional concrete.
- U.S. Pat. No. 2,734,433 B1 issued to Brown on Feb. 14, 1956, discloses a Trowel Device comprising a screed or trowel laid across uncured pavement material.
- the trowel is connected to a platform 22 where an operator stands and rocks an activation lever back and forth, thereby causing the trowel to slide back and forth and to smooth the pavement surface.
- a pair of parallel frame arms that can be attached to a skid loader or the like to pull the screed blade attached to the distant end of the frame side arms.
- the screed blade is perpendicular to the frame side arms and is designed to overhang the concrete forms, as riding along the tops of the concrete forms allows the screed blade to level and smooth poured concrete at the level of the tops of the concrete forms.
- Hydraulic vibrators vibrate the screed blade to puddle and smooth the poured concrete as the screed blade is drawn across it.
- Attached to the front face of the screed blade is a V-shaped pre-screed screeding blade for knocking down high spots or piles in the poured concrete before the primary screed blade passes over the concrete.
- the pre-screed screeding blade helps prevent the poured concrete from piling up against and overtopping the screed blade, which would require making a second pass over the poured concrete or would require additional manual working of the concrete.
- the primary screed blade is connected to the distal ends of the frame side arms by a mechanism that allows the screed blade to vibrate up and down.
- the concrete screed includes a pair of pulling arms that actually transmit the force to pull the screed blade, while the point of attachment of the frame side arms to the screed blade have very little, or no, pulling force exerted on them.
- the pulling arms are pivotally connected to the screed blade at one of their ends and are pivotally connected to the frame side arms at a point along the arms.
- FIG. 1 is a rear perspective view of a double-bladed vibrating concrete screed according to the present invention showing the double-bladed vibrating concrete screed attached to a skid loader and being used to level poured concrete within a form.
- FIG. 2 is a front perspective view of the double-bladed vibrating concrete screed of FIG. 1 .
- FIG. 3 is rear perspective view of the double-bladed vibrating concrete screed of FIG. 1 shown in use leveling poured concrete within a form.
- FIG. 4 is a rear perspective view of the attachment bracket of the double-bladed vibrating concrete screed of FIG. 1 , which is located at one end of the double-bladed vibrating concrete screed, which is attached to the skid loader.
- FIG. 5 is a front perspective view of the attachment bracket of FIG. 4 .
- FIG. 6 is an enlarged fragmentary rear perspective view of the attachment point of the attachment bracket of FIG. 4 .
- FIG. 7 is a rear view of the screed blade of the double-bladed vibrating concrete screed of FIG. 1 showing the adjustable slot mechanism for allowing the screed blade to be adjusted from straight to an arc to provide a crown in the poured concrete.
- FIG. 8 is a rear perspective view of a spring mounting mechanism of the screed blade on the double-bladed vibrating concrete screed of FIG. 1 that allows the screed blade to vibrate up and down, with the hydraulic vibrator omitted for clarity.
- FIG. 9 is an enlarged fragmentary rear top perspective view of a portion of the screed blade of the double-bladed vibrating concrete screed of FIG. 1 showing an enlarged view of one of the two hydraulic vibrators that are fixed to the screed blade, with the side arm of the frame omitted for clarity.
- a double-bladed vibrating concrete screed (concrete screed) 10 is pivotally connected to a skid loader 12 , or the like, utilizing the attachment fixtures of the skid loader 12 , which pulls the concrete screed 10 forward in the direction of the arrows 14 to pull the primary screed blade, or screed blade 16 along the poured concrete 18 to level and smooth the poured concrete surface 20 , assisted by the two spaced hydraulic vibrators 22 , which are conventional and are actuated by circulating hydraulic fluid pressurized by a conventional hydraulic pump delivering and recovering hydraulic fluid through the hydraulic hoses 23 .
- the hydraulic vibrators 22 are preferably hydraulic motors that rotate a weight off-set from the drive shafts of the hydraulic motors, which rotate at about 800 rpm, providing a stronger and slower vibration than an actual conventional hydraulic vibrator, spreading the poured concrete 18 more effectively.
- the poured concrete 18 is retained within the space defined by a left-hand side concrete form 24 and a right-hand side concrete form 26 , which are conventional, typically dimensional lumber held in place by stakes.
- the left-hand side concrete form 24 and the right-hand side concrete form 26 are straight and parallel, as shown in FIG. 1 , but other shapes can be employed.
- a portion of the screed blade 16 at or along the left-hand end 28 of the screed blade 16 must rest on the top edge 30 of the left-hand side form concrete 24 and a portion of the screed blade 16 at or along the right-hand end 32 of the screed blade 16 must rest on the top edge 34 of the right-hand side concrete form 26 .
- the top edges 30 , 34 of the concrete forms 24 , 26 serve as guides to forming the top surface of the finished concrete. Left and right are defined with respect to the view of an operator in the skid loader 12 , who will be looking toward the concrete screed 10 and driving backward.
- the screed blade 16 is formed from a length of metal angle iron having a front face or plow portion consisting of a vertical face 36 and a horizontal portion or face 38 , that strengthens the screed blade 16 and presents a smoothing lower surface to the poured concrete 18 for better distribution and smoothing of the poured concrete 18 .
- the screed blade 16 can be made from steel, but is preferably made from a strong aluminum alloy to reduce weight.
- a pre-screed screeding blade 40 is fixed to the screed blade 16 and presents itself to the poured concrete 18 in front of the screed blade 16 .
- the purpose of the pre-screed screeding blade 40 is to help level and disburse the poured concrete 18 , which typically is not poured level, but rather tends to have one or more piles that are significantly above the desired finished grade. Without the pre-screed screeding blade 40 , frequently concrete would ride up and over the screed blade 16 as long as it was of any reasonable height, resulting in concrete behind the screed blade 16 that was neither smooth nor level. It is desirable that the screed blade 16 make only a single pass over the poured concrete to save time and to prevent surface voids and to allow the cement to flow over the aggregate to provide an aggregate-free surface for final finishing.
- the pre-screed screeding blade 40 includes a left-hand side member 42 and a right-hand side member 44 fixed together by welding or the like to present a forward-projecting nose portion 46 , forming a V-shape in the pre-screed screeding blade 40 .
- the left-hand side member 42 of the pre-screeding screed blade 40 formed of right-angle material, includes a vertical face 43 and a horizontal face 45 .
- the right-hand side member 44 of the pre-screed screeding blade 40 formed of right-angle material, includes a vertical face 47 and a horizontal face 49 .
- the vertical faces 43 , 47 are presented to the poured concrete prior to screeding, that is, they face forward.
- pre-screed screeding blade 40 Other shapes of a pre-screed screeding blade 40 have been tried, including an arcuate shape and these other shapes may be used. The height and dimensions of the pre-screed screeding blade 40 are different from the screed blade 16 , as discussed below in connection with FIGS. 2 , 3 .
- the screed blade 16 is connected to the skid loader 12 by a pair of elongated spaced apart parallel frame arms, including a left-hand side frame arm 48 and a right-hand side frame arm 50 .
- the frame arms 48 , 50 are designed to be long enough that the screed blade 16 can be drawn across the expanse of poured concrete 18 in a single pass without having the skid loader 12 drive across either the poured concrete 18 or the concrete form into which the concrete is to be poured, which could damage the form.
- the distal end 52 of the left-hand side arm 48 is connected to the left-hand side mounting bracket 54 that is fixed to the screed blade 16 and the distal end 56 of the right-hand side arm 50 is connected to a right-hand side mounting bracket 58 that is fixed to the screed blade 16 .
- the mounting brackets 54 , 58 allow the screed blade 16 to move up and down, within limits, without any corresponding up or down movement by the arms 48 , 50 (See particularly FIG. 8 , below).
- the proximal end 60 of the left-hand side arm 48 is connected to a left-hand mounting pocket 62 in the proximal frame member 64 by the pin 66
- the proximal end 68 of the right-hand side arm 50 is connected to a right-hand mounting pocket 70 by the pin 72
- the pins 66 , 72 allow the arms 48 , 50 to pivot up and down without regard to any up or down movement of the skid loader 12 or the proximal end frame member 64 , thereby allowing the screed blade 16 to ride along the tops 30 , 34 of the concrete form members 24 , 26 regardless of any differences in the terrain or grade of the ground that the skid loader 12 is traveling along. Fittings along the back side of the proximal frame member 64 allow it to be dropped securely onto the attachment plates of the skid loader 12 (see FIGS. 2 , 5 , below).
- the horizontal faces 45 , 49 of the pre-screed screeding blade 40 are in the same plane and at the same level as the horizontal face 38 of the screed blade 16 .
- the pre-screed screeding blade 40 has a V-shape with a leading edge or nose 46 in the middle of the longest dimension, i.e., the width, of the pre-screed screeding screed blade 40 , which forms an angle between the two members 42 , 44 lying in the range of 110°-150°, with the preferred angle being 135° from the leading edge or nose 46 toward the rear of the concrete screed 10 .
- a top edge 74 of the pre-screed screeding blade 40 is somewhat lower than a top edge 76 of the screed blade 16 .
- a left-hand end 78 of the pre-screed screeding blade 40 terminates well inside the left-hand end 28 of the screed blade 16 and is fastened to it.
- a right-hand end 80 of the pre-screed screeding blade 40 terminates well inside the right-hand end 32 of the screed blade 16 and is fastened to it.
- the pre-screed screeding blade 40 is forward-projecting V-shaped and is shorter than the screed blade 16 in order to perform a preliminary and partial spreading and smoothing of the poured concrete 18 sufficiently that the screed blade 16 can finish the poured concrete 18 and to prevent the poured concrete 18 from piling up and on the screed blade 16 and pouring over its top edge.
- a horizontal triangular gusset 84 reinforces the connection between the back end 86 of the right-hand side member 44 of the pre-screeding blade 40 and the screed blade 16 toward its right-hand end 32 and a horizontal triangular gusset 88 reinforces the connection between the back of the left-hand side member 42 of the pre-screed screeding blade 40 and the screed blade 16 toward its right-hand end 32 .
- a pair of spaced parallel reenforcement angle-iron type aluminum struts 92 are fixed to the pre-screed screeding blade 40 at one end and to the screed blade 16 at the other, in the space between the two screed blades 40 , 16 .
- An adjustment mechanism 94 includes a vertical slot 95 in the middle of the vertical face 36 of the screed blade 16 to permit forming concrete with a crown if desired (see FIG. 7 ).
- the proximal frame member 64 includes a lower horizontal frame member 96 and a parallel upper horizontal frame member 98 that are connected by a left-hand vertical member 100 and a spaced parallel right-hand frame member 102 , which are symmetrically offset from the middle of the length of the proximal frame member 64 .
- a right-hand end vertical member 104 and a parallel left-hand end vertical member 106 complete a planar box-type portion of the proximal frame member 64 .
- a right-hand side gusset plate and arm boot 108 secures the pin 68 and the arm 50
- a corresponding left-hand side gusset plate and arm boot 110 secures the pin 66 and the arm 48 (with these gusset plate and arms 108 , 110 being shown more fully in FIGS. 4 , 5 , 6 ).
- An upstanding right-hand side interior gusset plate 112 includes an inward bend 114 , forming an inward leaning flange portion 115 , facilitating placement of the arm 50 into the resulting right-hand mounting pocket 70 .
- a corresponding upstanding left-hand side interior gusset plate 118 includes an inward bend 120 forming an inward leaning flange portion 121 , facilitating placement of the arm 48 into the resulting left-and mounting pocket 62 .
- the proximal frame member 64 can be mounted directly onto the mounting plates of a conventional skid loader 12 (not shown) or the like using the mounting fixtures on the front of the proximal frame member 64 , without the use of any fasteners.
- These fixtures include a right-hand open rectangular bracket 122 fixed along a bottom edge of the proximal frame member 64 and projecting forward, and directly above it a right-hand hooked sheet bracket member 124 , also projecting forward.
- a right-hand locator guide member 126 which includes an outwardly flared portion 128 .
- a symmetrical arrangement on the other side of the middle of the proximal frame member 64 includes a left-hand open rectangular bracket 130 fixed along a bottom edge of the proximal frame member 64 and projecting forward, and directly above it a left-hand hooked sheet bracket member 132 , also projecting forward.
- a left-hand locator guide member 134 Along a left-hand edge of the hooked sheet bracket member 132 is a left-hand locator guide member 134 , which includes an outwardly flared portion 136 .
- the outwardly flared portions 128 , 136 make it easier to locate the proximal frame member 64 onto the skid loader 12 .
- the screed blade 16 and attached pre-screed screeding blade 40 cannot be pulled during screeding by the ends of the frame arms 48 , 50 because they are connected to the screed blade 16 by vertical pins that allow the screed blade 16 to vibrate or float up and down in response to the hydraulic vibrators 22 (see FIG. 8 ) and that are not strong enough to support the screed blade 16 as it is pulled through the poured concrete 18 .
- a right-hand side pulling arm 138 has a proximal end 140 attached to the right-hand side arm 50 by a pivot pin 142 in corresponding apertures, allowing the right-hand side pulling arm 138 to pivot about the pin 142 .
- the right-hand side pulling arm 138 has a downward directed portion 144 , which allows the right-hand pulling arm 138 to pass over the top of the pre-screed screeding blade 40 , then descend to a distal end 146 , which is connected to a pivot pin 150 that is mounted through the reenforced pivot pin mounting bracket 58 , which is fixed to the front of the vertical face of the screed blade 16 , allowing the pulling arm 138 to pivot about the pivot pin 150 .
- the distal end of the right-hand pulling arm 138 is connected near the lower edge of the screed blade 16 so that pulling forces tend to keep the screed blade 16 in contact with the concrete forms 24 , 26 .
- An exact duplicate of the right-hand pulling arm, which is the left-hand pulling arm 154 is similarly fastened to the left-hand side arm 48 , being connected thereto at its proximal end to the pivot pin 156 and having a left-hand pulling arm distal end 156 connected by the pivot pin 160 to the pivot pin mounting bracket 162 , which is fixed to the screed blade 40 .
- the concrete screed 10 is illustrated as an enlarged fragmentary view, showing the screeding portions of the concrete screed 10 more clearly than FIGS. 1 , 2 .
- the left-hand pulling arm 154 is more clearly visible, including the downward directed portion 164 .
- the left-hand side gusset plate and arm boot 110 includes the outer upstanding vertical face portion 168 and an inwardly oriented horizontal flange portion 170 , with the two portions at right angles to each other.
- the left-hand side interior gusset plate 118 is fixed to the horizontal flange portion 170 by welding or the like.
- each of the right-hand side and left-hand side hooked sheet bracket members 124 , 132 as illustrated by the left-hand side hooked sheet bracket member 132 includes an upper, roughly flat horizontal portion 170 , which is fixed to the top edge 172 of the upper horizontal frame member 98 , and a downward bend 174 , resulting in a depending flange portion, or hook portion, 176 that stands away from the front face 178 of the upper horizontal frame member 98 .
- the two resulting hook portions allow the frame 64 to be securely suspended on the face of a typical front loader mounting system (not shown).
- the pivot pin 66 which is the same as all fastening pins in the concrete screed 10 , is conventional and includes a head 180 that will not pass through the apertures used, a tapered nose 182 to facilitate insertion into apertures, a hole 184 perpendicular to the shaft of the pivot pin 66 for receiving a locking pin 186 , which includes a pull ring 188 .
- This pin 66 is inserted into the aperture 190 , which passes through the left-hand side arm 48 adjacent to its proximal end 60 .
- Corresponding apertures are found in both sides of the left-hand side gusset plate and arm boot 110 .
- a flat trough portion 192 is formed between the vertical outer wall of the left-hand side gusset plate and arm boot 110 and the upstanding left-hand side interior gusset plate 118 .
- the flat trough portion 192 serves as a downward stop for the left-hand side arm 48 to limit downward movement, as does the corresponding assembly on the right-hand side of the proximal frame member 64 .
- the adjustment mechanism 94 includes a right-hand side bracket 194 bolted to the rear 198 of the screed blade 16 to the right of the vertical slot 95 and a corresponding left-hand side bracket 196 bolted to the rear 198 of the screed blade 16 to the left of the vertical slot 95 .
- An adjustment screw 200 passes through apertures in a right-hand vertical plate portion 202 of the right-hand side bracket 194 and an aligned aperture in a left-hand vertical plate portion 204 of the left-hand side bracket 196 and is secured by a pair of adjustment nuts 206 abutting the inner faces of the vertical plate portions 202 , 204 and a pair of locking nuts 208 abutting the outer faces of the vertical plate portions 202 , 204 .
- Loosening the locking nuts 208 allows the adjustment screws 206 to be rotated to move farther apart, thereby exerting outward force on the vertical plate portions 202 , 204 , causing the screed blade to bend, with its ends bending downward as shown by the deflection arrows 210 , widening the adjustment slot 95 .
- This mechanism allows the screed blade 16 to be bent to form a high line in a driveway or the like to form a crown, thereby improving drainage, if desired.
- the locking nuts 208 are tightened against the vertical plate portions 202 , 204 , locking the desired deflection into the screed blade 16 . Reversing this sequence returns the screed blade 16 to a flat orientation.
- the left-hand side arm 48 is conveniently made from tubular steel or aluminum having a rectangular cross section.
- An end cap 212 is fixed to the open end of the left-hand side arm 48 .
- a horizontally oriented tongue 214 is fixed to the end cap 212 and includes an aperture 216 adjacent to its distal end.
- a triangular reenforcing gusset 218 is fixed to the top surface of the tongue 214 and the end cap 212 .
- the left-hand side mounting bracket 54 is fixed to a front face 220 of the vertical face 38 of the screed blade 16 and includes a horizontal portion 222 essentially even with the top edge of the screed blade 16 .
- a vertically oriented pin 224 which is identical to the pin 66 is fixed through an aperture 226 in the left-hand side mounting bracket 54 by the nut 225 and a corresponding nut on the bottom surface of the mounting bracket 54 and passes through the aperture 216 in the tongue 214 .
- the pin 224 is longer than the tongue 214 is thick and an upper coil compression spring 228 is placed between the top of the pin 224 and the upper surface of the tongue 214 and a lower coil compression spring 230 is placed between the lower surface of the tongue 214 and the horizontal portion 222 of the left-hand side mounting bracket 54 , with the pin 224 passing through both of the springs 228 , 230 .
- the top of the pin 224 is closed off with the locking pin 186 .
- This mounting system reduces the mass vibrated by limiting it to essentially the screed blade 16 and its fixed attachments, transmitting little if any of the vibrating force to the frame side arms 48 , 50 .
- the right-hand side arm 50 is identically mounted onto the screed blade 16 .
- each hydraulic vibrator 22 is fixed to the rear face 232 of the vertical face 36 of the screed blade 16 by the bolts 234 .
- the hydraulic vibrators are conventional and their vibration rates and power are selected to be suitable for tamping the poured concrete 18 of the viscosity selected for a particular job.
- the horizontal triangular gusset 84 includes a horizontal face portion 236 and a downwardly oriented vertical face portion 238 that is fixed to the front face 220 of the vertical portion 36 of the screed blade 16 .
- the mounting bracket 58 includes a horizontal plate portion 240 that is fixed to the front face 220 of the vertical portion 36 of the screed blade 16 and a vertically oriented buttressing plate member 242 located adjacent to the pin 224 . This distal end 146 of the right-hand side pulling arm 138 is fixed by the pin 150 to a lower portion of the buttressing plate member 242 .
- the screed blade 16 is preferably made from strong aluminum alloy to save weight, while most other components are preferably made from steel to provide strength and to save money. Connections not intended to be disassembled are mostly welded, some, as shown in the drawing, are bolted. The connector pins e.g., 66 , are all used for connections designed to be disassembled.
- the concrete screed 10 can be broken down into pieces or segments that can be readily handled by one person and can be readily loaded into and transported by a pickup truck. It has been found that the concrete screed 10 can eliminate at least one job on small concrete jobs such as residential driveways, patios, small parking lots and so forth.
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- Road Paving Machines (AREA)
Abstract
A concrete screed includes an engaging frame for readily engaging the mounting fixture of a skid loader or the like, with a pair of spaced parallel frame arms long enough to keep the skid loader off the concrete form, with a screed blade attached to the distal ends of the two frame arms. A pre-screed screeding blade having a V-shape is fixed to the screed blade for knocking down high spots in poured concrete. The side frame arms are free to pivot up and down at both ends. A pair of pulling arms, each pivotally connected to the screed blade at one end and to a side frame arm at the other, exert the actual pulling force that pulls the screed blade across the poured concrete. A pair of hydraulic vibrators fixed to the screed blade vibrates the screed blade to puddle and settle the concrete for leveling.
Description
- Not Applicable.
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- The present invention is related to an apparatus for leveling concrete. More particularly, the present invention is directed to leveling concrete in an area between two forms for retaining poured concrete.
- The present invention is a double-bladed vibrating concrete screed for leveling poured concrete within a form, such as a driveway. Concrete is often poured from a chute at the back of a concrete truck or through a hose or nozzle. Although the chute or hose can be moved about to some extent, the concrete is invariably not level when poured and must be subsequently leveled before setting. In many applications, the leveling is carried out by a hand tool known as a screed that a worker drags across the concrete. The present invention is designed to reduce the labor needed for this operation by providing a screed that can be attached to a front loader, excavator, or the like which can control the elevation of the screed and drag it back and forth across the concrete, thereby leveling the concrete more quickly and easily.
- The requirement for leveling poured concrete has prompted the development of many different techniques and inventions, some of which have been patented. Some of these are discussed below.
- U.S. Pat. No. 7,121,762 B2, issued to Quenzi et al. on Oct. 17, 2006, discloses an Apparatus for Screening Uncured Concrete Surfaces, comprising a screeding device having a primary screed member, or vibratory beam that is mounted to a framework. The device includes a strike-off plow, which strikes the concrete before the vibratory beam. This device is pulled by a user as he walks backward
- U.S. Patent Application Publication Number US 2005/0265786 A1, describing an invention by Gresser et al. and published on Dec. 1, 2005, discloses a Method and Apparatus for Leveling Spreadable Material, comprising a screed member supported by a pair of parallel rails that are rigidly is attached to the bucket of a front loader through a pair of receiving sleeves attached to the bucket. The actual screed is supported by a pair of ski-like skids that rest on the ground or other substrate that must be moved through the material being graded. Although the screed arms have some up-and-down adjustment relative to the skids, there appears to be none where the arms are attached to the bucket of a front loader.
- U.S. Pat. No. 6,203,244 B1, issued to Van Ornum on Mar. 20, 2001, discloses a Screeding Apparatus, comprising a screed blade connected to a rear edge of a square frame that is supported by casters near the end opposite from the screed blade and having a fitting along the rear edge for receiving the prongs of a front loader or the like, which pulls the screed blade across concrete or the like. Since the casters ride on the ground, the screed will cause the material that is spread to have a surface contour related to the contour of the ground.
- U.S. Pat. No. 6,022,171 B1, issued to Munoz on Feb. 8, 2000, discloses an Apparatus and Method for Preparing a Site and Finishing Poured Concrete, comprising a
concrete finishing device 24 attached to the front of a motorized vehicle 20 (FIG. 1 ). The concrete finishing device includes first and second vibrating floats. A screed plate comprises a first screed plate in the concrete finishing device, which comprises a second screed blade located and attached forward of the vibrating floats and they will push the material during fine grading. - U.S. Pat. No. 5,567,075 B1, issued to Allen on Oct. 22, 1996, discloses an Offset Screed System and Quick Connect Mounting Therefore, comprising a
triangular truss frame 40 with a leading strike-off member for scraping off excess concrete followed by an identically shaped float, both of which are formed from angle iron or the like, with the leading strike-off member leading with its horizontal edge, while the float member leads with its vertical face. Vibrators are used to vibrate discrete and may be driven by a conventional motor driving the eccentrically weightedshaft 45 or by pneumatic or electric vibrators (column 6, lines 13-23). - U.S. Pat. No. 5,273,375 B1 issued to Plourde on Dec. 28, 1993, discloses a Trench Paving Device, comprising a screed for attaching directly to the lower lip of a front loader bucket by clamps. The device comprises a pair of opposed vertically oriented and rearwardly converging side plates disposed between the two side plates lies a vertically disposed rectangular plate which serves as the screed.
- U.S. Pat. No. 5,129,803 B1, issued to Normura et al. on Jul. 14, 1992, discloses a Concrete Leveling Machine, comprising a motor vehicle having a drive system that pulls a leveling unit. The wheels of the motor vehicle are designed to ride on the reenforcing bar for the concrete. The leveling unit includes an elongated leveling augur, a leveling plate and a tamper. The tamper is supported by two tamper support rods attached to the level of platform. The support rod is forced down with a coil compression spring. A tamper motor causes the tamper to shake up and down. The screed, is illustrated as being convex from bottom to top in the direction of travel and being physically higher than the tamper, although this appears not to be discussed in the verbal specification.
- U.S. Pat. No. 5,039,249 B1, issued to Hansen et al. on Aug. 13, 1991, discloses an Apparatus for Screening (sic; it should read Screeding) and Trowelling Concrete, comprising telescopic boom attached to a motor vehicle located away from the poured concrete. A screed attachment includes screed blade and a concrete float that is connected to a support member that is connected to two lifting rods. This entire assembly is connected to the boom. The screed blade is convex from top to bottom relative to the direction of travel, that is, is shaped like a short snow plow blade
- U.S. Pat. No. 4,995,760 B1, issued to Probst et al. on Feb. 26, 1991, discloses a Scraping Device for Making a Subgrade, comprising a scraper blade connected to a bucket for accumulating grade material, for example, sand, as they scraper is dragged across a pair of parallel rails set at the desired grade level.
- U.S. Pat. No. 4,685,826 B1, issued to Allen on Aug. 11, 1987, discloses a Vibratory Screed Including a Laterally Displaceable Oscillating Strike-Off, comprising a self-contained hydraulic system for vibrating a strike-off attachment (
FIG. 16 ) of a vibratory screed. The apparatus includes front and rear screed blades, both of which are flat, making them actually floats rather than screeds. This device is vibrated by the gasoline engine apparatus mounted on top of the apparatus. - U.S. Pat. No. 3,786,997 B1, issued to Viner on Jan. 22, 1974 discloses an Apparatus for Removing Unused Concrete, that is used for reclaiming ready-mix concrete that is left over after a job. The excess concrete is poured into a shallow form, allow to set and is then crushed by advancing a curved blade on a front end loader. The resulting debris can be used as aggregate and additional concrete.
- U.S. Pat. No. 2,734,433 B1, issued to Brown on Feb. 14, 1956, discloses a Trowel Device comprising a screed or trowel laid across uncured pavement material. The trowel is connected to a
platform 22 where an operator stands and rocks an activation lever back and forth, thereby causing the trowel to slide back and forth and to smooth the pavement surface. - The references described above do not disclose or suggest a concrete screed having the utility or versatility of the present invention, which can be, in the embodiment discussed below, that can be entirely used by a single operator, including assembly, disassembly, use, and transporting.
- Accordingly, it is a primary object of the present invention to provide a double-bladed vibrating concrete screed that levels concrete more effectively by allowing the screed blade to pivot up and down.
- It is another object of the present invention to provide a double-bladed vibrating concrete screed that has two screeding blades with a smaller first screeding blade, or pre-screeding screed blade for knocking down high spots in poured concrete so that the primary screed blade, or screed blade, is not overtopped by poured concrete, enabling most concrete to be sufficiently leveled in a single pass.
- It is another object of the present invention to provide a double-bladed vibrating concrete screed that can be readily assembled and disassembled into easily transportable sections.
- It is another object of the present invention to provide a double-bladed vibrating concrete screed that isolates up and down movement of the frame arms at either end of the frame arms from corresponding movement by the screed blade.
- These and other objects of the present invention are achieved by providing a pair of parallel frame arms that can be attached to a skid loader or the like to pull the screed blade attached to the distant end of the frame side arms. The screed blade is perpendicular to the frame side arms and is designed to overhang the concrete forms, as riding along the tops of the concrete forms allows the screed blade to level and smooth poured concrete at the level of the tops of the concrete forms. Hydraulic vibrators vibrate the screed blade to puddle and smooth the poured concrete as the screed blade is drawn across it. Attached to the front face of the screed blade is a V-shaped pre-screed screeding blade for knocking down high spots or piles in the poured concrete before the primary screed blade passes over the concrete. The pre-screed screeding blade helps prevent the poured concrete from piling up against and overtopping the screed blade, which would require making a second pass over the poured concrete or would require additional manual working of the concrete.
- The primary screed blade is connected to the distal ends of the frame side arms by a mechanism that allows the screed blade to vibrate up and down. In order to pull the screed blade from approximately its lower edge, the concrete screed includes a pair of pulling arms that actually transmit the force to pull the screed blade, while the point of attachment of the frame side arms to the screed blade have very little, or no, pulling force exerted on them. The pulling arms are pivotally connected to the screed blade at one of their ends and are pivotally connected to the frame side arms at a point along the arms.
- Other objects and advantages of the present invention will become apparent from the following description taken in connection with the accompanying drawings, wherein is set forth by way of illustration and example, the preferred embodiment of the present invention and the best mode currently known to the inventor for carrying out his invention.
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FIG. 1 is a rear perspective view of a double-bladed vibrating concrete screed according to the present invention showing the double-bladed vibrating concrete screed attached to a skid loader and being used to level poured concrete within a form. -
FIG. 2 is a front perspective view of the double-bladed vibrating concrete screed ofFIG. 1 . -
FIG. 3 is rear perspective view of the double-bladed vibrating concrete screed ofFIG. 1 shown in use leveling poured concrete within a form. -
FIG. 4 is a rear perspective view of the attachment bracket of the double-bladed vibrating concrete screed ofFIG. 1 , which is located at one end of the double-bladed vibrating concrete screed, which is attached to the skid loader. -
FIG. 5 is a front perspective view of the attachment bracket ofFIG. 4 . -
FIG. 6 is an enlarged fragmentary rear perspective view of the attachment point of the attachment bracket ofFIG. 4 . -
FIG. 7 is a rear view of the screed blade of the double-bladed vibrating concrete screed ofFIG. 1 showing the adjustable slot mechanism for allowing the screed blade to be adjusted from straight to an arc to provide a crown in the poured concrete. -
FIG. 8 is a rear perspective view of a spring mounting mechanism of the screed blade on the double-bladed vibrating concrete screed ofFIG. 1 that allows the screed blade to vibrate up and down, with the hydraulic vibrator omitted for clarity. -
FIG. 9 is an enlarged fragmentary rear top perspective view of a portion of the screed blade of the double-bladed vibrating concrete screed ofFIG. 1 showing an enlarged view of one of the two hydraulic vibrators that are fixed to the screed blade, with the side arm of the frame omitted for clarity. - Referring to
FIG. 1 , a double-bladed vibrating concrete screed (concrete screed) 10 is pivotally connected to askid loader 12, or the like, utilizing the attachment fixtures of theskid loader 12, which pulls theconcrete screed 10 forward in the direction of thearrows 14 to pull the primary screed blade, orscreed blade 16 along the poured concrete 18 to level and smooth the pouredconcrete surface 20, assisted by the two spacedhydraulic vibrators 22, which are conventional and are actuated by circulating hydraulic fluid pressurized by a conventional hydraulic pump delivering and recovering hydraulic fluid through thehydraulic hoses 23. Thehydraulic vibrators 22 are preferably hydraulic motors that rotate a weight off-set from the drive shafts of the hydraulic motors, which rotate at about 800 rpm, providing a stronger and slower vibration than an actual conventional hydraulic vibrator, spreading the poured concrete 18 more effectively. The poured concrete 18 is retained within the space defined by a left-hand sideconcrete form 24 and a right-hand sideconcrete form 26, which are conventional, typically dimensional lumber held in place by stakes. In many applications, the left-hand sideconcrete form 24 and the right-hand sideconcrete form 26 are straight and parallel, as shown inFIG. 1 , but other shapes can be employed. In many cases, there will also be another concrete retaining form at either or both ends of a completed form. In any case, a portion of thescreed blade 16 at or along the left-hand end 28 of thescreed blade 16 must rest on thetop edge 30 of the left-handside form concrete 24 and a portion of thescreed blade 16 at or along the right-hand end 32 of thescreed blade 16 must rest on thetop edge 34 of the right-hand sideconcrete form 26. Thetop edges concrete forms skid loader 12, who will be looking toward theconcrete screed 10 and driving backward. - Still referring to
FIG. 1 , thescreed blade 16 is formed from a length of metal angle iron having a front face or plow portion consisting of avertical face 36 and a horizontal portion orface 38, that strengthens thescreed blade 16 and presents a smoothing lower surface to the poured concrete 18 for better distribution and smoothing of the pouredconcrete 18. Thescreed blade 16 can be made from steel, but is preferably made from a strong aluminum alloy to reduce weight. Apre-screed screeding blade 40 is fixed to thescreed blade 16 and presents itself to the poured concrete 18 in front of thescreed blade 16. The purpose of thepre-screed screeding blade 40 is to help level and disburse the poured concrete 18, which typically is not poured level, but rather tends to have one or more piles that are significantly above the desired finished grade. Without thepre-screed screeding blade 40, frequently concrete would ride up and over thescreed blade 16 as long as it was of any reasonable height, resulting in concrete behind thescreed blade 16 that was neither smooth nor level. It is desirable that thescreed blade 16 make only a single pass over the poured concrete to save time and to prevent surface voids and to allow the cement to flow over the aggregate to provide an aggregate-free surface for final finishing. Thepre-screed screeding blade 40 includes a left-hand side member 42 and a right-hand side member 44 fixed together by welding or the like to present a forward-projectingnose portion 46, forming a V-shape in thepre-screed screeding blade 40. The left-hand side member 42 of thepre-screeding screed blade 40, formed of right-angle material, includes avertical face 43 and ahorizontal face 45. The right-hand side member 44 of thepre-screed screeding blade 40, formed of right-angle material, includes avertical face 47 and ahorizontal face 49. The vertical faces 43, 47 are presented to the poured concrete prior to screeding, that is, they face forward. Other shapes of apre-screed screeding blade 40 have been tried, including an arcuate shape and these other shapes may be used. The height and dimensions of thepre-screed screeding blade 40 are different from thescreed blade 16, as discussed below in connection withFIGS. 2 , 3. - Still referring to
FIG. 1 , thescreed blade 16 is connected to theskid loader 12 by a pair of elongated spaced apart parallel frame arms, including a left-handside frame arm 48 and a right-handside frame arm 50. Theframe arms screed blade 16 can be drawn across the expanse of poured concrete 18 in a single pass without having theskid loader 12 drive across either the poured concrete 18 or the concrete form into which the concrete is to be poured, which could damage the form. Thedistal end 52 of the left-hand side arm 48 is connected to the left-handside mounting bracket 54 that is fixed to thescreed blade 16 and thedistal end 56 of the right-hand side arm 50 is connected to a right-handside mounting bracket 58 that is fixed to thescreed blade 16. The mountingbrackets screed blade 16 to move up and down, within limits, without any corresponding up or down movement by thearms 48, 50 (See particularlyFIG. 8 , below). Theproximal end 60 of the left-hand side arm 48 is connected to a left-hand mounting pocket 62 in theproximal frame member 64 by thepin 66, while theproximal end 68 of the right-hand side arm 50 is connected to a right-hand mounting pocket 70 by thepin 72. Thepins arms skid loader 12 or the proximalend frame member 64, thereby allowing thescreed blade 16 to ride along the tops 30, 34 of theconcrete form members skid loader 12 is traveling along. Fittings along the back side of theproximal frame member 64 allow it to be dropped securely onto the attachment plates of the skid loader 12 (seeFIGS. 2 , 5, below). - Referring to
FIG. 2 , the horizontal faces 45, 49 of thepre-screed screeding blade 40 are in the same plane and at the same level as thehorizontal face 38 of thescreed blade 16. Thepre-screed screeding blade 40 has a V-shape with a leading edge ornose 46 in the middle of the longest dimension, i.e., the width, of the pre-screedscreeding screed blade 40, which forms an angle between the twomembers nose 46 toward the rear of theconcrete screed 10. Atop edge 74 of thepre-screed screeding blade 40 is somewhat lower than atop edge 76 of thescreed blade 16. A left-hand end 78 of thepre-screed screeding blade 40 terminates well inside the left-hand end 28 of thescreed blade 16 and is fastened to it. A right-hand end 80 of thepre-screed screeding blade 40 terminates well inside the right-hand end 32 of thescreed blade 16 and is fastened to it. Thepre-screed screeding blade 40 is forward-projecting V-shaped and is shorter than thescreed blade 16 in order to perform a preliminary and partial spreading and smoothing of the poured concrete 18 sufficiently that thescreed blade 16 can finish the poured concrete 18 and to prevent the poured concrete 18 from piling up and on thescreed blade 16 and pouring over its top edge. A horizontaltriangular gusset 84 reinforces the connection between the back end 86 of the right-hand side member 44 of thepre-screeding blade 40 and thescreed blade 16 toward its right-hand end 32 and a horizontaltriangular gusset 88 reinforces the connection between the back of the left-hand side member 42 of thepre-screed screeding blade 40 and thescreed blade 16 toward its right-hand end 32. A pair of spaced parallel reenforcement angle-iron type aluminum struts 92 are fixed to thepre-screed screeding blade 40 at one end and to thescreed blade 16 at the other, in the space between the twoscreed blades adjustment mechanism 94 includes avertical slot 95 in the middle of thevertical face 36 of thescreed blade 16 to permit forming concrete with a crown if desired (seeFIG. 7 ). - Still referring to
FIG. 2 , theproximal frame member 64 includes a lowerhorizontal frame member 96 and a parallel upperhorizontal frame member 98 that are connected by a left-handvertical member 100 and a spaced parallel right-hand frame member 102, which are symmetrically offset from the middle of the length of theproximal frame member 64. A right-hand endvertical member 104 and a parallel left-hand endvertical member 106 complete a planar box-type portion of theproximal frame member 64. A right-hand side gusset plate andarm boot 108 secures thepin 68 and thearm 50, while a corresponding left-hand side gusset plate andarm boot 110 secures thepin 66 and the arm 48 (with these gusset plate andarms FIGS. 4 , 5, 6). An upstanding right-hand sideinterior gusset plate 112 includes aninward bend 114, forming an inward leaningflange portion 115, facilitating placement of thearm 50 into the resulting right-hand mounting pocket 70. A corresponding upstanding left-hand sideinterior gusset plate 118 includes aninward bend 120 forming an inward leaningflange portion 121, facilitating placement of thearm 48 into the resulting left-and mountingpocket 62. - Still referring to
FIG. 2 , theproximal frame member 64 can be mounted directly onto the mounting plates of a conventional skid loader 12 (not shown) or the like using the mounting fixtures on the front of theproximal frame member 64, without the use of any fasteners. These fixtures include a right-hand open rectangular bracket 122 fixed along a bottom edge of theproximal frame member 64 and projecting forward, and directly above it a right-hand hookedsheet bracket member 124, also projecting forward. Along a right-hand edge of the hookedsheet bracket member 124 is a right-handlocator guide member 126, which includes an outwardly flaredportion 128. A symmetrical arrangement on the other side of the middle of theproximal frame member 64 includes a left-hand openrectangular bracket 130 fixed along a bottom edge of theproximal frame member 64 and projecting forward, and directly above it a left-hand hookedsheet bracket member 132, also projecting forward. Along a left-hand edge of the hookedsheet bracket member 132 is a left-handlocator guide member 134, which includes an outwardly flaredportion 136. The outwardly flaredportions proximal frame member 64 onto theskid loader 12. - Still referring to
FIG. 2 , thescreed blade 16 and attachedpre-screed screeding blade 40 cannot be pulled during screeding by the ends of theframe arms screed blade 16 by vertical pins that allow thescreed blade 16 to vibrate or float up and down in response to the hydraulic vibrators 22 (seeFIG. 8 ) and that are not strong enough to support thescreed blade 16 as it is pulled through the pouredconcrete 18. In any event, it is preferable to pull thescreed blade 16 by forces applied adjacent to its bottom edge to prevent any tendency for the top edge to tilt forward, or disengage from theconcrete forms screed blade 16 is actually pulled by a pair of pulling arms. A right-handside pulling arm 138 has aproximal end 140 attached to the right-hand side arm 50 by apivot pin 142 in corresponding apertures, allowing the right-handside pulling arm 138 to pivot about thepin 142. The right-handside pulling arm 138 has a downward directedportion 144, which allows the right-hand pulling arm 138 to pass over the top of thepre-screed screeding blade 40, then descend to adistal end 146, which is connected to apivot pin 150 that is mounted through the reenforced pivotpin mounting bracket 58, which is fixed to the front of the vertical face of thescreed blade 16, allowing the pullingarm 138 to pivot about thepivot pin 150. The distal end of the right-hand pulling arm 138 is connected near the lower edge of thescreed blade 16 so that pulling forces tend to keep thescreed blade 16 in contact with theconcrete forms hand pulling arm 154, is similarly fastened to the left-hand side arm 48, being connected thereto at its proximal end to thepivot pin 156 and having a left-hand pulling armdistal end 156 connected by thepivot pin 160 to the pivotpin mounting bracket 162, which is fixed to thescreed blade 40. - Referring to
FIGS. 3 , theconcrete screed 10 is illustrated as an enlarged fragmentary view, showing the screeding portions of theconcrete screed 10 more clearly thanFIGS. 1 , 2. The left-hand pulling arm 154 is more clearly visible, including the downward directedportion 164. - Referring to
FIG. 4 , the left-hand side gusset plate andarm boot 110 includes the outer upstandingvertical face portion 168 and an inwardly orientedhorizontal flange portion 170, with the two portions at right angles to each other. The left-hand sideinterior gusset plate 118 is fixed to thehorizontal flange portion 170 by welding or the like. - Referring to
FIG. 5 , each of the right-hand side and left-hand side hookedsheet bracket members sheet bracket member 132 includes an upper, roughly flathorizontal portion 170, which is fixed to thetop edge 172 of the upperhorizontal frame member 98, and adownward bend 174, resulting in a depending flange portion, or hook portion, 176 that stands away from thefront face 178 of the upperhorizontal frame member 98. The two resulting hook portions allow theframe 64 to be securely suspended on the face of a typical front loader mounting system (not shown). - Referring to
FIG. 6 , thepivot pin 66, which is the same as all fastening pins in theconcrete screed 10, is conventional and includes ahead 180 that will not pass through the apertures used, atapered nose 182 to facilitate insertion into apertures, ahole 184 perpendicular to the shaft of thepivot pin 66 for receiving alocking pin 186, which includes apull ring 188. Thispin 66 is inserted into theaperture 190, which passes through the left-hand side arm 48 adjacent to itsproximal end 60. Corresponding apertures are found in both sides of the left-hand side gusset plate andarm boot 110. Aflat trough portion 192 is formed between the vertical outer wall of the left-hand side gusset plate andarm boot 110 and the upstanding left-hand sideinterior gusset plate 118. Theflat trough portion 192 serves as a downward stop for the left-hand side arm 48 to limit downward movement, as does the corresponding assembly on the right-hand side of theproximal frame member 64. - Referring to
FIG. 7 , theadjustment mechanism 94 includes a right-hand side bracket 194 bolted to the rear 198 of thescreed blade 16 to the right of thevertical slot 95 and a corresponding left-hand side bracket 196 bolted to the rear 198 of thescreed blade 16 to the left of thevertical slot 95. Anadjustment screw 200 passes through apertures in a right-handvertical plate portion 202 of the right-hand side bracket 194 and an aligned aperture in a left-handvertical plate portion 204 of the left-hand side bracket 196 and is secured by a pair ofadjustment nuts 206 abutting the inner faces of thevertical plate portions nuts 208 abutting the outer faces of thevertical plate portions nuts 208 allows the adjustment screws 206 to be rotated to move farther apart, thereby exerting outward force on thevertical plate portions deflection arrows 210, widening theadjustment slot 95. This mechanism allows thescreed blade 16 to be bent to form a high line in a driveway or the like to form a crown, thereby improving drainage, if desired. When the desired deflection of thescreed blade 16 has been achieved, the lockingnuts 208 are tightened against thevertical plate portions screed blade 16. Reversing this sequence returns thescreed blade 16 to a flat orientation. - Referring to
FIG. 8 , the left-hand side arm 48 is conveniently made from tubular steel or aluminum having a rectangular cross section. Anend cap 212 is fixed to the open end of the left-hand side arm 48. A horizontally orientedtongue 214 is fixed to theend cap 212 and includes anaperture 216 adjacent to its distal end. Atriangular reenforcing gusset 218 is fixed to the top surface of thetongue 214 and theend cap 212. The left-handside mounting bracket 54 is fixed to afront face 220 of thevertical face 38 of thescreed blade 16 and includes ahorizontal portion 222 essentially even with the top edge of thescreed blade 16. A vertically orientedpin 224, which is identical to thepin 66 is fixed through anaperture 226 in the left-handside mounting bracket 54 by thenut 225 and a corresponding nut on the bottom surface of the mountingbracket 54 and passes through theaperture 216 in thetongue 214. Thepin 224 is longer than thetongue 214 is thick and an uppercoil compression spring 228 is placed between the top of thepin 224 and the upper surface of thetongue 214 and a lowercoil compression spring 230 is placed between the lower surface of thetongue 214 and thehorizontal portion 222 of the left-handside mounting bracket 54, with thepin 224 passing through both of thesprings pin 224 is closed off with thelocking pin 186. This allows the left-hand side arm 48 to vibrate up and down in response to the vibrations of thehydraulic vibrators 22, largely isolating the right-hand side arm 50 and the left-hand side arm 48 from the up and down vibrations caused by thehydraulic vibrators 22. This mounting system reduces the mass vibrated by limiting it to essentially thescreed blade 16 and its fixed attachments, transmitting little if any of the vibrating force to theframe side arms hand side arm 50 is identically mounted onto thescreed blade 16. - Referring to
FIG. 9 , eachhydraulic vibrator 22 is fixed to therear face 232 of thevertical face 36 of thescreed blade 16 by thebolts 234. The hydraulic vibrators are conventional and their vibration rates and power are selected to be suitable for tamping the pouredconcrete 18 of the viscosity selected for a particular job. - Referring to
FIG. 10 , the horizontaltriangular gusset 84 includes a horizontal face portion 236 and a downwardly orientedvertical face portion 238 that is fixed to thefront face 220 of thevertical portion 36 of thescreed blade 16. The mountingbracket 58 includes ahorizontal plate portion 240 that is fixed to thefront face 220 of thevertical portion 36 of thescreed blade 16 and a vertically oriented buttressingplate member 242 located adjacent to thepin 224. Thisdistal end 146 of the right-handside pulling arm 138 is fixed by thepin 150 to a lower portion of the buttressingplate member 242. - The
screed blade 16 is preferably made from strong aluminum alloy to save weight, while most other components are preferably made from steel to provide strength and to save money. Connections not intended to be disassembled are mostly welded, some, as shown in the drawing, are bolted. The connector pins e.g., 66, are all used for connections designed to be disassembled. In the size contemplated and illustrated herein for example, theconcrete screed 10 can be broken down into pieces or segments that can be readily handled by one person and can be readily loaded into and transported by a pickup truck. It has been found that theconcrete screed 10 can eliminate at least one job on small concrete jobs such as residential driveways, patios, small parking lots and so forth. - While the present invention has been described in accordance with the preferred embodiments thereof, the description is for illustration only and should not be construed as limiting the scope of the invention. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention as defined by the following claims.
Claims (20)
1. A concrete screed comprising:
a. a proximal frame member for attaching to a pulling means,
b. a pair of elongated spaced apart parallel frame side arms, said frame side arms further comprising a right-hand side arm and a left-hand side arm, each said side arms having a proximal end pivotally connected to said proximal frame member;
c. a screed blade connected to a distal end of said right-hand side arm and to a distal end of said left-hand side arm, with said screed blade being perpendicular to said right-hand arm and to said left-hand arm; and
d. a pre-screed screeding blade connected to a front face of said screed blade.
2. A concrete screed in accordance with claim 1 further comprising a right-hand side pulling arm having a proximal end connected to said right-hand side arm intermediate its two ends and a distal end connected to said screed blade and a left-hand side pulling arm having a proximal end connected to a said left-hand side arm intermediate its two ends and having a distal end connected to said screed blade.
3. A concrete screed in accordance with claim 1 wherein said screed blade further comprises a vertical face and a horizontal face.
4. A concrete screed in accordance with claim 1 further comprising means for bending said screed blade whereby a crown can be formed in poured concrete.
5. A concrete screed in accordance with claim 1 further comprising means for vibrating said screed blade.
6. A concrete screed in accordance with claim 5 further comprising at least one hydraulic vibrator mounted on said screed blade.
7. A concrete screed in accordance with claim 5 wherein said means for vibrating further comprises means for isolating up and down vibration of said screed blade from said right-hand side arm and from said left-hand side arm.
8. A concrete screed in accordance with claim 7 wherein said means further comprises an upper compression spring and a lower compression spring mounted on a pin with said screed blade having a tongue mounted between said upper compression spring and said lower compression spring at the distal end of each of said right-hand side arm and said left-hand side arm.
9. A concrete screed in accordance with claim 1 wherein said proximal frame member further comprises a right-hand mounting pocket for pivotal attachment of said right-hand side member and a left-hand mounting pocket for pivotal attachment of said left-hand side member.
10. A concrete screed in accordance with claim 9 further comprising means for removably attaching said proximal frame member to the mounting fixtures of a skid loader.
11. A concrete screed in accordance with claim 10 wherein said attaching means further comprises a right-hand hooked sheet bracket member and a left-hand hooked sheet bracket member, both fixed to an upper horizontal frame member of the proximal frame member and a right-hand locator guide member and a left-hand guide member fixed to said proximal frame member.
12. A concrete screed in accordance with claim 1 wherein said pre-screed screeding blade further comprises a forward projecting V-shaped screed blade having a nose portion.
13. A concrete screed comprising:
a. a proximal frame member for attaching to a pulling means,
b. a pair of elongated spaced apart parallel frame side arms, said frame side arms further comprising a right-hand side arm and a left-hand side arm, each said side arms having a proximal end pivotally connected to said proximal frame member;
c. a screed blade connected to a distal end of said right-hand side arm and to a distal end of said left-hand side arm, with said screed blade being perpendicular to said right-hand arm and to said left-hand arm;
d. a pre-screed screeding blade connected to a front face of said screed blade; and
e. a right-hand side pulling arm having a proximal end connected to said right-hand side arm intermediate its two ends and a distal end connected to said screed blade and a left-hand side pulling arm having a proximal end connected to a said left-hand side arm intermediate its two ends and having a distal end connected to said screed blade.
14. A concrete screed in accordance with claim 13 further comprising means for vibrating said screed blade and said connected pre-screed screeding blade.
15. A concrete screed in accordance with claim 14 further comprising means for isolating said right-hand side arm and said left-hand side arm from vibration of said screed blade and said pre-screed screeding blade.
16. A concrete screed in accordance with claim 13 further comprising means for attaching said proximal frame member to the mounting fixtures of a skid loader.
17. A concrete screed comprising:
a. a proximal frame member for attaching to a pulling means,
b. a pair of elongated spaced apart parallel frame side arms, said frame side arms further comprising a right-hand side arm and a left-hand side arm, each said side arms having a proximal end pivotally connected to said proximal frame member;
c. a screed blade connected to a distal end of said right-hand side arm and to a distal end of said left-hand side arm, with said screed blade being perpendicular to said right-hand arm and to said left-hand arm;
d. a pre-screed screeding blade connected to a front face of said screed blade;
e. a right-hand side pulling arm having a proximal end connected to said right-hand side arm intermediate its two ends and a distal end connected to said screed blade and a left-hand side pulling arm having a proximal end connected to a said left-hand side arm intermediate its two ends and having a distal end connected to said screed blade;
f. means for vibrating said screed blade and said connected pre-screed screeding blade and means for isolating said right-hand side arm and said left-hand side arm from vibration of said screed blade and said pre-screed screeding blade.
18. A concrete screed in accordance with claim 17 further comprising means for attaching said proximal frame member to the mounting fixtures of a skid loader.
19. A concrete screed in accordance with claim 17 wherein said vibrating means further comprises at least one hydraulic vibrator.
20. A concrete screed in accordance with claim 17 wherein said screed blade further comprises a vertical face and a horizontal face and said pre-screed screeding blade further comprises a vertical face and a horizontal face and is V-shaped.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/315,419 US20090092444A1 (en) | 2008-12-03 | 2008-12-03 | Double-bladed vibrating concrete screed |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/315,419 US20090092444A1 (en) | 2008-12-03 | 2008-12-03 | Double-bladed vibrating concrete screed |
Publications (1)
Publication Number | Publication Date |
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US20090092444A1 true US20090092444A1 (en) | 2009-04-09 |
Family
ID=40523370
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US12/315,419 Abandoned US20090092444A1 (en) | 2008-12-03 | 2008-12-03 | Double-bladed vibrating concrete screed |
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US (1) | US20090092444A1 (en) |
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US20110123269A1 (en) * | 2009-11-24 | 2011-05-26 | Kenco Engineering, Inc. | Screed Plate |
US8083005B1 (en) * | 2009-12-29 | 2011-12-27 | Nicolai Troy D | Land leveling device |
CN105113372A (en) * | 2015-09-15 | 2015-12-02 | 郑州大学 | Large-area concrete-pavement trowelling machine |
US9382674B1 (en) | 2012-08-14 | 2016-07-05 | Ronald A. Knapp | Concrete finishing machine |
US9476169B1 (en) | 2012-08-14 | 2016-10-25 | Ronald A. Knapp | Concrete finishing machine |
US9677230B2 (en) * | 2015-10-07 | 2017-06-13 | Luke Terstriep | Wide swath offset concrete screed |
CN108560923A (en) * | 2018-07-25 | 2018-09-21 | 陈素赫 | Double-telescopic-arm sliding four-wheel leveling machine |
CN108660898A (en) * | 2018-07-23 | 2018-10-16 | 中铁四局集团第五工程有限公司 | Concrete leveling machine for railway track closed layer |
CN109914196A (en) * | 2019-03-28 | 2019-06-21 | 中联重科股份有限公司 | Side tensioning device of ironing plate and paver |
CN111576883A (en) * | 2020-07-07 | 2020-08-25 | 台州市椒江预提自动化设备有限公司 | Cement pouring machine capable of vibrating and press polishing cement |
WO2022047482A1 (en) * | 2020-08-26 | 2022-03-03 | Somero Enterprises, Inc. | Concrete screeding machine for tilt-up panels |
US11479928B2 (en) * | 2018-01-15 | 2022-10-25 | Robert Pasqualotto | Screed accessory for levelling uncured concrete surfaces |
GB2623587A (en) * | 2022-10-21 | 2024-04-24 | Pasqualotto Robert | Accessory for concrete surface preparation |
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US20110123269A1 (en) * | 2009-11-24 | 2011-05-26 | Kenco Engineering, Inc. | Screed Plate |
US9103078B2 (en) * | 2009-11-24 | 2015-08-11 | Kenco Engineering, Inc. | Screed plate |
US8083005B1 (en) * | 2009-12-29 | 2011-12-27 | Nicolai Troy D | Land leveling device |
US9382674B1 (en) | 2012-08-14 | 2016-07-05 | Ronald A. Knapp | Concrete finishing machine |
US9476169B1 (en) | 2012-08-14 | 2016-10-25 | Ronald A. Knapp | Concrete finishing machine |
CN105113372A (en) * | 2015-09-15 | 2015-12-02 | 郑州大学 | Large-area concrete-pavement trowelling machine |
US10480133B2 (en) | 2015-10-07 | 2019-11-19 | Dragon Screed Llc | Wide swath offset concrete screed |
US10132047B2 (en) * | 2015-10-07 | 2018-11-20 | Dragon Screed, LLC | Wide swath offset concrete screed |
US10233597B2 (en) | 2015-10-07 | 2019-03-19 | Dragon Screed, LLC | Wide swath offset concrete screed |
US9677230B2 (en) * | 2015-10-07 | 2017-06-13 | Luke Terstriep | Wide swath offset concrete screed |
US11220794B2 (en) | 2015-10-07 | 2022-01-11 | Dragon Screed Llc | Wide swath offset concrete screed |
US11479928B2 (en) * | 2018-01-15 | 2022-10-25 | Robert Pasqualotto | Screed accessory for levelling uncured concrete surfaces |
CN108660898A (en) * | 2018-07-23 | 2018-10-16 | 中铁四局集团第五工程有限公司 | Concrete leveling machine for railway track closed layer |
CN108560923A (en) * | 2018-07-25 | 2018-09-21 | 陈素赫 | Double-telescopic-arm sliding four-wheel leveling machine |
CN109914196A (en) * | 2019-03-28 | 2019-06-21 | 中联重科股份有限公司 | Side tensioning device of ironing plate and paver |
CN111576883A (en) * | 2020-07-07 | 2020-08-25 | 台州市椒江预提自动化设备有限公司 | Cement pouring machine capable of vibrating and press polishing cement |
WO2022047482A1 (en) * | 2020-08-26 | 2022-03-03 | Somero Enterprises, Inc. | Concrete screeding machine for tilt-up panels |
US11965345B2 (en) | 2020-08-26 | 2024-04-23 | Somero Enterprises, Inc. | Concrete screeding machine for tilt-up panels |
GB2623587A (en) * | 2022-10-21 | 2024-04-24 | Pasqualotto Robert | Accessory for concrete surface preparation |
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