US2046991A - Threading device - Google Patents

Description

July '7, 1936; Z- 2,046,991 THREADING V-IDEVICE Filed Aug. 2, 1955 A INVENTOR d 7 we T/M6 W ATTORNEY Patented July 7, 1936 v attain PATENT .orricr 2,046,991 ,THREADING DEVICE Ludwig Zeller,

Thiensville, Wis.

" Application August-2, 1935, Serial No. 34,330

8 Claims.

This invention relates to pipe threading apparatus and particularly to a device which is selfcontained and'readily transportable. I An object of the invention is to provide a pipe threading mechanism which is readily manually operable, even for relatively large pipe diameters, and therefore adapted for use in locations where power is not available tor the threading operation.

Another object is to provide an improved manually operable and self-contained pipe threading device having certain automatic and control features greatly improving the convenience, accuracy and certainty of operation of the device.

Another object is-to provide improved threading means in which the threading tool is positively fed forward at a rate corresponding to the pitch of the threads to be cut and simultaneously rotated and in a form adapted for manual operation and to be used in a self-contained and easily transportable unit.

Another object is to provide improved means for the simultaneous forward and rotational movement while providing for reverse movement at relatively rapid rate without the rotation of the threading tool, and in a self-contained transportable and manually operable unit.

Another object is, to provide a self-:opening threading die of improved form and particularly adapted for use in a structure for one or more of the objects previously mentioned. I

A further object is generally to simplify and improve the construction and operation of thread cutting machines and particularly of machines adapted for manual operation and unitarily transportable. I

The invention consists in construction and combination of parts as herein illustrated, described and claimed and in such modifications of the structure illustrated and described as may be equivalent to the structure of the claims.

In the specification like reference characters denote the same parts throughout and in the drawing:

Figure 1 is a front elevation of a device incor- "porating'the invention, partly in section along the axis of a threading tool spindle incorporated therein.

Figure 2 is a partial elevation of the same device viewed from the line'Z-Z of Fig. 1 and enlarged.

Figure 3 is a sectional development taken along the line 3-3 of Fig. 2.

Figure 4 is a partial section taken approximately along the line 4-4 of Fig. 2.

Figure 5 is a partial section taken along line 5--5 of Fig. 1, in reduced scale.

The device includes a' base I having slotted cars such as 2 adapted to receive holding .bolts such as 3 by the means of which the unit may be attached to any convenient support such as for instance a bench. Fixed on base I is a pipe support generally denoted by the numeral 4, for a pipe 5 which is to be threaded. Support 4 includes a threaded bore 4a, adapted to interchangeably receive bushings such as lb, respectively having different diametered bores to receive difierent sizes of pipe, the bushings 4b having a flange ie, for purposes later described, and being threaded to engage the bore 4a to provide for axial adjustment as the bushing is rotated. Support 4 provides pipe clamp means, consisting of a screw 6 which may be operated by a suitable wrench, not shown, the support being slotted as at Sat, and the'bushings 4b also being slotted to permit the contraction of the bores to clamp the pipe.

A die head generally denoted by the numeral I is carried by a spindle 8 rotatably mounted in a support generally denoted by the numeral 9 fixed on base I and providing spindle bearings in axial alignment with the pipe 5. Spindle B is slidably keyed in the bore of a worm wheel II] which is prevented from axial movement by the bearing faces II and I2.

A worm I3 fixed on a shaft I4 engages worm wheel I0, and is supported from bearings I31; and I322, fixed on base I, which restrain the worm against axial movement. Worm I3 may be manually rotated by the means of a crank, not shown, applied to the squared end portion I5 of the worm shaft.

p The rear end of the spindle 8 engages a threaded portion I6 of a member i! carried on a bearing or support I8 fixed on base I, the member I! being restrained against axial movement by an enlarged portion I9 and a collar i9a, removably fixed on the member by a pin I912. The enlarged portion I9 of the member I1 is provided with one or more notches such as 20. A manually operable latch 2 I pivoted at 22 may be moved to the one position to engage notch 29, as shown in Fig. 1, thereby locking member Ilagainst rota- 1 tion, or may be swung about pivot 22 to another position disengaged from the slot .25 to permit rotation of the member, which may be effected by applying a suitable crank, not shown, to a squared end 23 of the member.

The die head 1 includes a body portion 24 fixed on the spindle by the means of screws such as 24a, Fig. 1, there being a suitable spindle flange 24b, Fig. 3 engaging a complementary bore in the body 24 for co-axially aligning the spindle and body. The body 24 provides a plurality of slots such as 25 in which die blades or chasers 26 are radially movable and restrained against axial movement by a plate 2'! fixed on the body 24 by themeans of screws such as 28, theblades 26 slidably engaging the plate 21 on the one hand and the bottom of slots 25 on the other hand.

and 33, the adjacent ends of the members.., 3l providing a continuation of the slots as at 34, and also providing, for each of the chasers26, a tongue such as 35 engaging a tongue slot such as 36 in the chaser, the tongues 35 and slots 36' being disposed at an angle, as-indicatedin Fig,

4, corresponding to the cone angle of the bore 29. As a result of the arrangement just described 5 a movement of the member axially of the body 24 will simultaneously equally move, each of the chasers 36 inwardly or outwardly radially, while at any point in the movement the chasers will be rigidly held against either radial or axial movement.

Another member, 31, also mountedon the periphery of the body 24; for axial movement relative thereto, is connected for unitary axial movement with the member 30 by the means of a threaded nut 38, the threaded portions on the members 30 and 31 being respectively of opposite pitch whereby a rotation of the nut 38, adjusts the one member. relative to the other, the nut being lockablewiththe respective members by the means of screws such as 39 and 40.

The members 30 and 31 are unitarily urged to the left in Figs. 1 and 3 by the means of springs. such as 4| abutting in one direction againstthe bottom of the bores 42 and in-the other direction against pins 43' which are fixed in the member 31. Unless. prevented the springs 4| will urge the members 39 and 31 to the left until the left hand end of the member 31 strikes a shoulder portion 44 onspindle 8. The,;.men bers 30 and 31 may, however, be; manually shifted to the right in Figs. 1 and 3 until a spring pressed plunger 45 engages the bore 46-of a bushing-4,1 fixed inYthe body 24, and when this occursv-the engagement of the plungerinthe bore holds the member 31 in a predetermined position,- determined by the plunger engagement,

When the plunger 45 isengagedin thebore 46 as described the threading device'is -ready for operation. Assuming that the pipe ,5 has been suitably clamped in the holder 4, and that the latch 2| has been moved into engagement with the slot 20, thenmanual rotation lofuthe worm shaft l5 .will simultaneously rotate the die head 1 in a cutting direction and advance the die head to the right in Fig. 1 at a rate corresponding to the pitch of ,the threads to becut, and determined by the pitch of the threaded portion iii of the member. H. Thislsimultaneous rotation and axial movement. is continued until the die head 1 has advanced. sufiiciently far to the, right to cut the desired-thread on the end of the pipe. Ordinarily the thread. to. be, cut is. of tapered form, as shown inFigV 1.

Variousdifferently threaded. spindles 8; and members l'l may be interchangeably usedto provide, for pipe, threads of different pitch and yarious sets ofrchasers such as 26 may be used for cutting threads on different diameters of pipe, thev chaser sets being interchangeable inthe, die head 1 merely by removing the plate 21', when the chasers may be readily withdrawn andreplaced.

Whenthe die head has beenadvancedaxially, as described, a sufficient distance to produce the desired thread on the pipe 5, the chasers 36 are automatically withdrawn radially from contact with the threaded portions of the pipe. This is effected by the following means: A ring or plate 48,is ,supportedpn a plurality of plungers 49 which are r/guided in the body 24 and. normally urged to the right in Fig. 3 by the means of springs 50. Plungers 49 operate against radially movable plungers 5| which are urged outwardly as the plungers 49 move to the left in Fig. 3, and aftensuff cient of such left hand movement the plungers 45 are disengaged from the bores 46 d l the springsJt then immediately urge the members 30 and 31 to the left, thereby moving each of the chasers 26 outwardly. The movement of the,-plungers.,49;;to bring thiszabout is effected bythe contact of,the, plate or ring 48 with the flange, 4c on the bushing 4b; from which it, will be seen that at a predetermined point, corresponding, to the point at which the pipe is threadedto the desired extent the chasers 25 will begexpanded clearing the gthreads on the pipe to permit withdrawal of the die. head'L;

The die head I and spindle 8 is then withdrawn inthe, followingmanner. The latch'2 I is manually;mo ved to disengage from the slot 20, a crank is appliedto thensquared end.- 23 ;-as. previously mentioned,- andthe-men ber I'l is rotated. Spindle 8:;is -,preven' edfrom rotation when member l'lg'is rotated by theself-locking engagement oil the worm wheel- I fl-withits worm, and the spindle and diehead 1 are non rotatably movedaxially toi the, left to the startingpositionat a relatively very rapid rate since the rates v between the crankand spindle does. not involve thereduction effected by the worm and wheel, this reduction being necessarydqthe .forwardmovement in orderto permit the manual,.-,operation of the threading die-i Atthe end of the left handmovementthelatch 2| is again moved to engage notch 20.,=the members! and 31. are manually shifted to the right until plungeri45 again engages the bore 46*; and the device is then-ready for another threading operation.

If the size of the thread cut bythe chasers 26 on the pipe- 5; as determined by the point at which the chasers are opened by plate' 48,;is slightly too large or too small in diameter, the

desired; correction in thread diameter may be.

cluding aprimary manually operable element,

means supported from said base for axially nonrotatably -moying saidthreading tool in the other direction including a second primary manually operable element, a pluralityof motion transmitting trains carried by'said base and respectively connecting the different elements for the different movements recited, the, .train for-said other directionbeing adapted for relativelyfast axial movement,, andmeans, carried-by said base, .for rendering-said mean for axiallvmovingi the threading tool in the other direction operative or inoperative.

2. In a threading device of the nature disclosed the combination of a base, a pipe clamping means supported from said base, a threading tool rotatably supported from said base adjacent said clamping means and axially movable, means supported from said base for simultaneously rotating and axially advancing said threading tool in the direction of said clamping means including a primary manually operable element, means supported from said base for non-rotatably axially moving said threading tool in the other direction including a second primary manually operable element, said means including a screw and nut element and a plurality of motion transmitting trains carried by said base and respectively connecting the different manually operable elements through said screw and nut element for the different axial movements recited, the train for said second manually operable element being adapted for relatively fast axial movement of said threading tool, and means carried by said base and shiftable to alternative positions respectively locking and unlocking rotation of one of said screw and nut elements.

3. In a pipe threading device the combination of a pipe clamping means, a threading means rotatably supported adjacent said clamping means and axially movable, means for simultaneously rotating and axially advancing said threading means in the direction of said clamping means including a primary manually operable element, means for axially moving said threading means in the other direction including a second primary manually operable element, said elements being connected for said movements by different motion transmitting trains and said connection for said second element being adapted for relatively fast axial movement of said threading means, means locking said threading means against rotation during axial movement in said other direction and means adjustable for locking said second element against operation.

4. In a pipe threading device the combination of pipe clamping means, a rotatable spindle supported for axial movement toward and from said clamp means and co-axial with a pipe clamped therein, a tool head fixed with said spindle adjacent said clamp means, a manually operable screw thread device directly operative on said spindle for axial non-rotatable movement thereof in a direction away from said clamp means, and a manually operable device for simultaneous rotation and axial movement of said spindle in the other direction including gearing for a material reduction in the relative rate of both axial and rotary movement therefrom, said gearing being of a form and ratio to lock said spindle against rotation during axial movement from the first mentioned manual device.

5. In a pipe threading device the combination of pipe clamp means, a spindle rotatably supported in axial alignment with a pipe held in said clamp means and axially movable toward and from said clamp means, a threading tool fixed on said spindle adjacent said clamp means, a member rotatably journaled co -axially with said spindle adjacent the end opposite said threading tool, said member being fixed against axial movement and threadedly engaging said spindle, a locking device shiftable between alternative positions respectively disengaged from said member to permit rotation thereof and engaging said member to prevent rotation thereof, a worm wheel mounted on said spindle to permit relative axial movement therebetween, a worm engaging said worm wheel, a shaft for said worm, and a plurality of primary manually movable elements respectively fixed with said member and with said shaft.

6. In a pipe threading device the combination of pipe clamp means, a spindle rotatably supported in axial alignment with a pipe held in said clamp means, and axially movable toward and from said clamp means, a threading tool fixed on said spindle adjacent said clamp means, a member rotatably journaled co-axially with said spindle adjacent the end opposite said threading tool, said member being fixed against axial movement and threadedly engaging said spindle, a locking device shiftable between alternative positions respectively disengaged from said member to permit rotation thereof and engaging said member to prevent rotation thereof, a worm wheel mounted on said spindle to permit relative axial movement therebetween, a worm engaging said worm wheel, a shaft for said worm, a plurality of primary manually movable elements respectively fixed with said member and with said shaft, a base unitarily supporting said device and means associated with said base for removably unitarily attaching said device to a support.

'7. In a threading device the combination of a base, a rotatable and axially movable spindle carried by said base, a threading tool eo-axially fixed at one end of said spindle for rotation and axial movement therewith, engaged screw and nut elements co-axial with said spindle, one of said elements being fixed with said spindle for rotation and axial movement therewith and the other element being rotatably carried by said base, means carried by said base and manually shiftable for engaging said other element to prevent rotation thereof and alternatively shiftable to disengage from said element to permit element rotation, a first manually operable train for forward cutting operation of said spindle when said shiftable means is in engaged position and including a primary manually rotatable shaft, a worm fixed against axial movement and a worm wheel fixed against axial movement and slidably splined with said spindle, a second manually operable train including a primary manually operable member connected for rotation of said other element when said shiftable means is in disengaged position.

8. In a threading device of the nature disclosed the combination of a base, pipe clamping means fixed with said base, a rotatable spindle carried by said base and guided for bodily movement in axial alignment with a pipe fixed in said clamping means, a threading tool carried by said spindle adjacent said clamping means, means carried by said base for manually rotating said spindle, means carried by said base and operative simultaneously with the spindle rotation to advance said spindle and threading tool in the direction of said clamping means, means carried by said base for rendering said simultaneously operative means ineiiective, means carried by said base for manually non-rotatably axially moving said spindle and threading tool in the other direction while said simultaneous means is ineffective and means carried by said base for unitarily removably attaching said device to a support.

LUDWIG ZELLER.

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