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WO2003038199A1 - Support de bras de levage pour petite chargeuse et configuration de rangement - Google Patents

Support de bras de levage pour petite chargeuse et configuration de rangement Download PDF

Info

Publication number
WO2003038199A1
WO2003038199A1 PCT/US2002/034581 US0234581W WO03038199A1 WO 2003038199 A1 WO2003038199 A1 WO 2003038199A1 US 0234581 W US0234581 W US 0234581W WO 03038199 A1 WO03038199 A1 WO 03038199A1
Authority
WO
WIPO (PCT)
Prior art keywords
lift arm
arm assembly
lift
cylinder
cross member
Prior art date
Application number
PCT/US2002/034581
Other languages
English (en)
Inventor
Mark F. Bares
James H. Page
Original Assignee
Clark Equipment Company
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US10/000,847 external-priority patent/US6695568B2/en
Priority claimed from US10/044,104 external-priority patent/US6698114B2/en
Application filed by Clark Equipment Company filed Critical Clark Equipment Company
Publication of WO2003038199A1 publication Critical patent/WO2003038199A1/fr

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
    • E02F3/3414—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines the arms being pivoted at the rear of the vehicle chassis, e.g. skid steer loader
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/34—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with bucket-arms, i.e. a pair of arms, e.g. manufacturing processes, form, geometry, material of bucket-arms directly pivoted on the frames of tractors or self-propelled machines
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/24—Safety devices, e.g. for preventing overload

Definitions

  • the present invention relates to a lift arm assembly construction for use on a small loader that is operated from the rear of the loader.
  • the lift arm assembly can be raised for lifting loads.
  • a mechanical support is provided for holding the lift arms in their raised position and is stored in a cross member of the lift arm assembly.
  • the lift arm assembly has a upright strut for ' intercepting and deflecting objects that may roll from the back of the bucket if the bucket is overfull and the lift' arm assembly is fully raised.
  • Skid steer loaders commonly use a mechanical stop that will carry compression loads and is placed between the rod end cap of an extended cylinder and the lift arm so that the lift arm will not lower and the cylinder cannot retract. Mechanical stops are used when the loader is being serviced. Various mechanical stops that will retract under a spring load have been advanced. In small or mini loaders, space is limited, and compact lift arm geometry is such that typical retractable stop designs cannot be integrated.
  • the present invention relates to a . small, self propelled loader with a lift arm assembly that can be raised and lowered.
  • Controls for the lift arms and ground drive are all at the rear of the machine, and accessible by an operator standing on the ground or standing on a support platform at the rear of the machine.
  • the lift arm pivots are generally a little higher than waist high on an operator.
  • the operating control levers are just to the rear of the lift arm pivots for accessibility of the operator.
  • the lift arms are made into a rigid lift arm assembly with a cross member at the front end of the lift arms that also supports an upright strut for mounting a cylinder or actuator that is used for tilting the bucket or work implement.
  • a structural member is integrated into the strut that mounts the cylinder for tilting the bucket.
  • the structural member acts as a backstop for intercepting and deflecting objects, such as logs or rocks that may fall from the bucket when the lift arms are raised to the top of their travel and the load is not kept level.
  • the cross member of the lift arm assembly opens through one side of lift arms and is utilized for- -storing a mechanical- support "that: -holds' -the - lirft arms in their raised position when the loader is serviced. This eliminates the need for storing the support externally of the lift arm, where it can be in the way or add to the size of the small loader.
  • the support has a key shaped end that includes a tang that fits into a recess formed between side plates to provide a way of knowing the correct orientation for installation.
  • Figure 1 is a side elevational view of a small, compact walk behind loader made according to having lift arms constructed according to the present invention
  • Figure 2 is a perspective view of the loader of Figure 1;
  • Figure 3 is a side view of the loader of Figure 1 showing the lift arm in raised position in dotted lines;
  • Figure 4 is a fragmentary enlarged view showing the upper portions of the lift arms in a raised position and a support strut in place;
  • Figure 5 is a sectional view taken on line 4—4 in Figure 3;
  • Figure 6 is a rear fragmentary exploded perspective view of the forward portions of the lift arm assembly, showing the cross tube that holds the lift arms in an assembly and a lift arm mechanical support;
  • a miniature (mini) loader indicated generally • at 10 is a walk behind power loader that has a body or frame 12.
  • the frame 12 supports a track assembly 14 on each side of the loader for propelling the loader 10 in forward and reverse directions through the use of drive hydraulic motors indicated generally at 16.
  • the drive motors 16 are hydraulic motors operated through a pump 19 and a valve arrangement with a separate valve 18 for each motor 16 which is part of hydraulic valve controls 20 at the upper end of a control panel for the loader.
  • the pump 19 is driven by an internal combustion engine 45 mounted on the body or frame in a housing 17 that has a cover 17A. The engine is centered laterally on the frame.
  • Each track assembly includes a track frame 14A, a drive sprocket 14B and a front idler wheel 14C over which a track 14D is mounted.
  • Bogie wheels 14E are also provided on the track frame for supporting the track.
  • the body or frame 12 has spaced plates forming upright supports 22 at the rear portions, and these supports 22 extend upwardly a little higher than waist level of an operator standing on the ground-.
  • the lift arm assembly 24 includes individual lift arms 24A and 24B, on opposite sides of the body or frame, and each lift arm has a base end portion or rear plate portion 25 that inclines downwardly at an angle essentially parallel to the rear portions of the body frame and engine cover.
  • each lift arm has bend portion 57 forming a forward end of the base portion, which joins a side lift arm portion 32 that extends parallel to the upper length 14F of the respective track 14D of the track assembly on that side of the loader with the lift arm assembly in a lowered position.
  • the side lift arm portions 32 join forward lift arm portions 34 that are curved to fit around the front of the drive tracks, 14D, respectively.
  • the radius portion 60 has a forwardly extending portion indicated generally in dotted lines at 62 that extends into a tubular interior of the tubular side arm portions 32.
  • the rear portions can be plates of steel, or can be tubes if desired.
  • the forward lift arm portions 34 are plates formed with contoured recesses formed with a radiused surface 34R.
  • the lift arm assembly 24 is raised and lowered with extendible and retractable double acting -hydraulic -- cyiinders -or- -actuators 26 opera-ting - with hydraulic pressure from the pump 19 and controlled by valves forming part .of the controls 20.
  • the cylinders 26 (there is one on each side, and only one is shown) have base ends pivotally mounted as at 28 to the upright portions of the body or frame 12, and the cylinders have extendible and retractable rods 29 that ' have rod ends that are pivotally mounted as at 30 to each of the • side lift arm portions 32 of the lift arm assembly 24.
  • the lift arms 24A and 24B include the side lift arm portions 32, and forwardly extending lift arm portions 34 that curve forwardly over the forward ends 36 of the drive tracks. Pivot pins 38 in turn are used for mounting a quick attachment plate 40 of conventional design normally used with the BOBCAT® skid steer loaders made by Bobcat Company, an unincorporated Business Unit of Ingersoll-Rand Company.
  • the attachment plates 40 are well known, and the pins 38 permit the attachment plate to be pivoted about a horizontal axis by a bucket control cylinder 41 that has its base end connected as at 42 to an upright strut 44 mounted on a cross member 70.
  • Crossmember 70 also holds the lift arms 24A and 24B together to form the lift arm assembly 24.
  • the rod end of the actuator or cylinder 41 is connected as at 45 to a bracket on the attachment plate 40.
  • the upright strut 44 that is used for the bucket cylinder 41 is provided with an upwardly projecting backstop 46, which, as can be seen in Figures 6 and 7, is formed by spaced apart
  • the cylinder 41 fits between these plates.
  • the plates of the backstop form a forward edge 50, that is above the rear lip or corner of the attachment plate 40 and above the back wall 51 of the bucket 48.
  • the excess objects • may tend to roll out, backwardly. If this happens the edge 50 of the two spaced plates that form the strut 46 will tend to stop or deflect the objects tending to roll back along the lift arms 24.
  • the support strut 60 is a channel shaped member that is of size to fit over the cylinder rod 29, and includes a base end 62 that has guides fingers 64 that will position and retain the support strut on the end of the cylinder 26.
  • the base end 62 rests against the end surface 26A of the cylinder 26.
  • the mechanical lift arm support strut 60 has a flange 65 at the opposite end of the support strut.
  • the flange 65 has a recess aligned with the longitudinal channel opening of the lift arm support strut 60, so it fits over the rod 29 like a saddle.
  • the flange 65 engages the lift arm assembly to provide a support or stop for the lift arm assembly adjacent to the connecting pin or pivot 30 for the rod end on the rod 29 of the cylinder 26.
  • the flange 65 rests against a curved edge 67 of the forward lift arm portion 34 and an edge 68 of a side skirt of f-lange 69 that i-s welded- i-n- -the -1-i-f-t -arm- -assembly nd is spaced from the front arm portion 34 sufficient to permit the rod end of cylinder rod 23 to fit in the space .
  • the rectangular tubular cross member 70 forms a structural member and is reinforced to the front lift arm portions 34 with braces or gusset plates 72.
  • the cross member 70 extends across the lift arm assembly.
  • Figure 4 and 6 show the right end of the cross member 70.
  • cross member 70 also provides the main support for the upright strut 44 and the back stop member 46 on the upright strut.
  • the lift arm support strut 60 is stored inside the rectangular cross section tubular cross member 70, and extends across the lift arm assembly when stored.
  • the lift arm support strut 60 is retained in place in the cross member with a U-shaped bracket 74 on the side of the associated lift arm, which receives a tab or key 76 on the end flange 64 of the strut 60 between side walls of the bracket 74.
  • the flange 65 stays on the outer end of the lift arm and cross member 70, and will not slide into the interior of the cross member:
  • a lock pin 78 is passed through openings in the side walls of the U- shaped bracket 74, and is positioned on the outside of the tab 76 to hold the lift arm support strut 60 in the cross tube 70 during use of the loader.
  • the lift arm support strut .60 is used to mechanically support the lift arm assembly.
  • the flange member 65 is placed up near the rod end of the cylinder rod 29.
  • the lift arm support strut rests over the rod 29 and the tab 76 extends upwardly and aligns with the space or recess formed between front lift arm portion 34 and the skirt 69.
  • the tab 76 orients the lift arm support strut so it will not be likely to rotate out of position and fall off.
  • the cylinder ' 26 can then be retracted slightly until the edges 67 and 68 engage flange 65 and the tab 76 slides between the forward lift arm portion 24 and the skirt 69. With the guide fingers 64 in position, the lift arm support strut is locked in position, and will not fall out. The lift arms cannot lower until the support strut 60 is removed by reversing the installation sequence.
  • the lift arm assembly 24 is made to provide a unique support for the tilt cylinder for the bucket, and incorporates in that support a deflector strut that is positioned above the upper edges of the bucket and positioned to deflect objects that may fall out of the bucket when the lift arms are raised fully and the bucket is not kept level.
  • the side rm portions 32 are substantially parallel to and spaced upwardly from an upper length or reach 14U of the track 14D that forms part of the track assembly 14;--The -base portions --2-5 - of the lift- -arms -extend so that the side arm portions 32 are parallel to the longitudinal axis of the hydraulic actuators or cylinders 26.
  • This geometry forms a compact assembly.
  • the cylinder rod is attached to the plates 34 forming the forward lift arm portions so when the lift arms are lowered the cylinders 26 are in the position shown in Figure 1. There is a substantial mechanical advantage even in this lowered position between the pivot point 21 and the pivot 28 of the base of the cylinders 26 where they join the frame.
  • the frame 12 can have counterweights 86 mounted thereon at the rear, the size and number are selected to be suitable for the type of operation that is being carried out with the loader.
  • the operator will stand or walk behind the loader, and operate the controls with the control handles 20 to move the loader through motors 16- -a-nd to -raise and iowe-r the -f-fe- -a-rm- assembly 24 as desired.
  • the side-to-side visibility is greatly enhanced by having the offset section at the base end of the lift arm to drop the side portions 32 down along the sides of the housing for the engine and substantially parallel to the top reach or lengths of the tracks.
  • the moving of the side portions ⁇ of the lift arm aids in lowering the center of gravity of the machine, particularly in the lower portions of the lift path.
  • the lower center of gravity aids stability.
  • the small loader that is disclosed has no operator's platform.
  • the propulsion system for moving the loader is disclosed specifically as a track unit.
  • skid steer loaders are commonly mounted on wheels on the sides that are driven simultaneously on each side, from a separate motor on each side.
  • the present loader can be wheel mounted, with the tops of the wheels on a plane parallel to the center portion of the lift arm and close to the top plane just like the top length of the track is positioned.
  • the propulsion system that supports the loader for movement can be sets of wheels mounted in place of the tracks shown.
  • the controls for operating the lift arms can be conventional valve controls.
  • the propulsion drive motors 16 (there is a motor on each side of the frame) will propel the loader across the ground. There is a separate drive motor 16 for each of the •trac-ks -shown-,- -and- -the d-r-ive motors -are i-nd-i-vi-duaH-y controlled so that the load can be steered as well as being movable in forward direction or reverse direction.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Shovels (AREA)

Abstract

L'invention concerne un ensemble bras de levage (24) pour une petite ou une mini-chargeuse chenillée (10) qui est monté pivotant sur un châssis à autopropulsion (12) et qui se déplace entre une position de levage et une position d'abaissement. Une entretoise de support (60), qui s'adapte sur la tige en extension (29) du vérin de commande (26) du bras de levage (24) en position relevée, empêche ce dernier de s'abaisser. L'entretoise de support (60) est rangée dans la traverse tubulaire avant (70) de l'ensemble bras de levage (24). Sur la traverse tubulaire avant (70) repose par ailleurs une entretoise verticale (44) qui sert de butée arrière pour le godet chargé (48), ce qui permet d'arrêter ou de dévier un objet qui a tendance à rouler vers l'arrière dans le godet (48). Chaque bras de levage (24A, 24B) comporte une partie arrière (25) orientée vers le bas et l'avant qui est reliée aux flancs (32) des bras de levage (24A, 24B) qui sont sensiblement parallèles aux actionneurs hydrauliques (26) utilisés et qui sont parallèles aux bords supérieurs (14U) des chenilles d'entraînement (14D) respectives lorsque l'ensemble bras de levage (24) est en position abaissée.
PCT/US2002/034581 2001-11-01 2002-10-29 Support de bras de levage pour petite chargeuse et configuration de rangement WO2003038199A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US33531101P 2001-11-01 2001-11-01
US10/000,847 US6695568B2 (en) 2001-11-01 2001-11-01 Low profile lift arm for small skid steer loader
US10/000,847 2001-11-01
US60/335,311 2001-11-01
US10/044,104 2002-01-11
US10/044,104 US6698114B2 (en) 2001-11-01 2002-01-11 Lift arm support and storage construction for small loader

Publications (1)

Publication Number Publication Date
WO2003038199A1 true WO2003038199A1 (fr) 2003-05-08

Family

ID=27356763

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/034581 WO2003038199A1 (fr) 2001-11-01 2002-10-29 Support de bras de levage pour petite chargeuse et configuration de rangement

Country Status (1)

Country Link
WO (1) WO2003038199A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122758A (en) * 1977-06-09 1978-10-31 Caterpillar Tractor Co. Service support
US4352626A (en) * 1980-12-22 1982-10-05 J. I. Case Company Loader arm positioning device
US4904151A (en) * 1988-07-07 1990-02-27 Deere & Company Loader lift arm structure
US4947705A (en) * 1989-05-12 1990-08-14 Ingersoll-Rand Company Method and apparatus for maintaining a load raising linkage in a rasied position
US5009566A (en) * 1989-10-20 1991-04-23 Clark Equipment Company Retractable boom stop
US5575513A (en) * 1995-04-03 1996-11-19 Tuttle; Willis A. Automobile hood strut lock
US5634762A (en) * 1994-12-23 1997-06-03 Daewoo Heavy Industries Ltd. Boom locking device for a skid steer loader
US6171050B1 (en) * 1997-08-29 2001-01-09 Gehl Company Load arm assembly for a skid steer loader

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4122758A (en) * 1977-06-09 1978-10-31 Caterpillar Tractor Co. Service support
US4352626A (en) * 1980-12-22 1982-10-05 J. I. Case Company Loader arm positioning device
US4904151A (en) * 1988-07-07 1990-02-27 Deere & Company Loader lift arm structure
US4947705A (en) * 1989-05-12 1990-08-14 Ingersoll-Rand Company Method and apparatus for maintaining a load raising linkage in a rasied position
US5009566A (en) * 1989-10-20 1991-04-23 Clark Equipment Company Retractable boom stop
US5634762A (en) * 1994-12-23 1997-06-03 Daewoo Heavy Industries Ltd. Boom locking device for a skid steer loader
US5575513A (en) * 1995-04-03 1996-11-19 Tuttle; Willis A. Automobile hood strut lock
US6171050B1 (en) * 1997-08-29 2001-01-09 Gehl Company Load arm assembly for a skid steer loader

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