US2200927A - Work holder - Google Patents

Description

May '14, 1940. 1'. M. LILLEBE RG 2,200,927

I WORK HOLDER Filed March 9, 1939 3 Sheets-Sheet 1 May 14, 1940. 'r. M. LILLEBERG WORK HOLDER 3 Sheets-Sheet 2 Filed March 9} 1939 v Wifizmarz & w

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T. M; LILLEBERG 2,200,927

WORK HOLDER Filed March 9; 1939 3 Sheets-Sheet 3 I Zijya Patented May 14, 1940 UNITED STATES WORK HOLDER Tideman M. Lilleberg,

Chicago, 111., assignor to The Nye Tool & Machine Works, a corporation of Illinois Application March 9, 1939, Serial N0. 260,846

1'7 1 Claims.

My invention relates to work holders of the type having jaws to receive between them the work to be held, such as for example a pipe to be threaded.

v One of my objects is to provide a novel, simple, and positively operating construction of holder of the type referred to. I

Another object is to provide a construction of holder which may be quickly and easily operated to clamp the work therein in properly centered position.

Another object is to provide a construction of holder which may be quickly and easily operated to clamp the work therein regardless of its cross sectional size within certain limits.

Another object is to provide a construction of work holder whereby through a single drive element work, regardless of its cross sectional dimension, within certain limits, may be rigidly clamped in the proper centered position; and other objects as will be manifest from the following description.

Referring to the accompanying drawings:

Figure 1 is a view in end elevation, partly sectional, of pipe threading mechanism comprising a work holder constituting one of the forms in which my invention may be embodied.

Figure 2 is a section taken at the line 2 on Fig. 1 and viewed in the direction of the arrow.

30 Figure 3 is a fragmentary view like Fig. 1 showing. in elevation the parts illustrated in section in Fig. 1 and with other parts sectioned.

Figure 4 is a fragmentarysectional view taken at the line 4 on Fig. 3 and viewed in the direction of the arrow.

Figure 5 is a sectional view of certain of the parts shown in Figs. 1-4. v

Figure 6 isa view in elevation of one of the jaws of the device.

Figure 7 is a plan view of certain of the-parts of the structure shown in Fig. 5, these parts being viewed at the line 1 in this figure.

Figure 8 is an end view of the jaw of Fig. 6.

Figure 9 is a fragmentary view of the structure of Fig. 5 viewing it in the direction of the arrow 9 in this figure.

Figure 10 is a fragmentary sectional view of a jaw-equipped portion of the device of Figs. 1 and 2.

Figure 11 is a view in side elevation, partly sectional, of a gear-equipped sleeve forming a part of the structure shown in Fig. 10.

Figure 12 is a view like Fig. 1 of another form of structure embodying my invention.

Figure 13 is a section taken at the line l3 on Fig. 12 and viewed in the directionof the arrow. Figure 14 is a view like Fig. 1 of still another form of structure embodying my invention; and Figure 15, a section taken at the line l5 on Fig. 14 and viewed in the direction of the arrow. Referring to the construction shown in Figs. 1-11, inclusive, it comprises a ring member l6 formed of sections I! and i8 having registering annular channels forming an annular recess IS,

the sections l1 and [8 being shown as secured tolo gether as by screws 20.

The section l8 has arms one of which is shown at 2|, extending therefrom lengthwise of the device and connected with a ring portion 22 internally threaded at 23 at which it is adapted to u have threaded connection, in accordance with common practice, with a carrier 24 (a portion only of which is shown) for the thread-cutting chasers (not shown) for cutting a thread on a pipe, such as the pipe 25 rigidly clamped, against rotation, in the work holder of which the rings l6 and 22 are parts.

The ring section I1 is provided with a pluv rality of radially movable jaws shown as three in number and designated at 26, 21 and 28, and sub- 25 stantially equidistantly spaced around the ring I6.

The jaws 26-48 are ings in the ring section circular cross sectional shape as shown of'one 30 of these openings at 29 in Figs. 5 and 9. The jaws 26-28 at their inner end portions are of a cross sectional shape to slidingly fit the openings in the ring section ll, having opposite flat sides as represented at 30, whereby these jaws are held against rotation.

The end faces of the jaws 26-28 have cross grooves 3i and are chamfered as shown at 32 to form biting edges.

The jaws 26 and 21 are externally threaded at their outer ends as represented at 33 at which" portions they screw into the internal threads of rotatable sleeves 34 surrounding them and. located in similar recesses in the ring section H, the recess for the one of the sleeves 34 surrounding the jaw 26, being shown at 35. I The inner ends of the sleeves 34 are provided with similar pinions, the pinion for the sleeve 34 surrounding the jaw 26, being shown at 36, bushings 31 screwed into the threaded outer ends of the recesses referred to, in conjunction with the end walls of these recesses, holding the sleeves 34 against longitudinal movement.

The pinions on the sleeves 34 mesh with a ring gear 38 'rotatably' confined in the recess IS,

slidable in radial open- Il, each being of nonend asshown at 39 at which portion it engages threaded connection with the move the latter outwardly.

an internal thread 40 on a rotatable sleeve 4| extending at its inner end into a recess 42 ..in

the ring section H at the opening 29, the inner end of the sleeve 4| having an external annular flange 43. Surrounding the sleeve 4| is, a rotatable sleeve 44 annularly recessed at 45 torreceive the flange 43 and having a pinion 46 thereon identical with the pinions on the sleeves 34. A

bushing 4'! screwed into the recess 42,'in con junction with the end wall of this recess, prevents lengthwise movement of the sleeve 44 and such movement of the sleeve 4| is prevented bythe overlapping of the flange 43 with the inner end of the sleeve 44.

Surrounding the outer end of the sleeve 48 and secured thereto, as by rivets 48, "is asleeve 49 having an expanded end 50 surrounding the outer end of the sleeve 44, the'sleeve 53 having arcuate recess 5| for a purpose hereinafter explained. v

Located between the expanded endfiii of the sleeve 49 and the sleeve"4|,is a coil spring '52, 'under tension tending'to'uncoil, one end thereof, represented at 53, being connected with the sleeve 49 and its other end 54 connected with the gear sleeve 44.

vTheg'ear sleeve 44 is provided with a pin 55 'which'extends into the arcuate recessfil. The'sleeves 4| and 49 which form a single rotatable unit, are provided with handl'e'means by which to rotate them, as forexample the sliding bar handle shown'at 56a which is slidable crosswise of these sleeves in openings provided therein. "Inthe use of the work holder the operator rotates the sleeves 4| and 49 in counterclockwise direction in Fig. 4 to withdraw the jaws 26, 21 and 28 sufficiently'to permit the-pipe '25 to be slid into the space between these jaws. The jaw 23 is moved outwardly by the threaded engage merit "of the sleeve 4 with the jaw and'the jaws 26 and El aresimilarly moved simultaneously -with the jaw 28 by the rotationof the gear sleeve "'44 through the engagement of 1 the end Wall 5 la of the slot 5| with the pin 55', the gear sleeve 44 "in rotating driving the rmgear w which latter,

in turn, rotates the sleeves 34 which through their jaws 253 and 2'! To clamp'the'pipe in place, the operatorrotates the sleeves 4| and 45 in clockwise direction'in Fig. 4. The jaw'28 is'moved inwardly bythe frotation of the sleeve 4| and the jaws-26 and "21 are simultaneously moved inwardly with the "jaw' 28 through the medium of thesleeves 34,

ringgear 38, gear sleeve 44, and spring 52, the

spring'52 being under such tension in the normal position of the parts that through "it thejaws' 26 and 21 move simultaneouslyihward, with the jaw ?|i,*it being understood that the drive of the gear-sl-eeve *44= is through the medium of this spring. All of the jaws continue'their simultaneous inward movement until they engage the pipe "25'urider a pressure exceeding the tension of the spring 52.

'sleev es4l and 49 throughout a partial revolution The'operator continues'to rotate the thus causing the jaw 28to continue to move-inwardly and effect tight clamping of the pipe within the holder. It will be understood that" in this final rotative movement of the sleeves 4| and 49 the spring 52, because of its connection with the gear sleeve 44, which latter has 5 become stationary, is increased in tension, the recess 5| permitting the sleeves 4| and 49 to thus-continue their rotation after the movement of the gear sleeve 44 has been arrested. The

threaded connection between the jaw 39 and 10 f the sleeve 4| is sufficiently fine as to prevent the jaw 28 from moving outwardly after having once been set in the clamped position stated.

The initial tensionlng of the spring 52 determines the pressure exerted by the jaws 26, 21 15 and 23 against the pipe in their simultaneous inward movement; the final inward movement of the jaw 28, independently of the jaws 26 and 27, efiecting the final clamping of the pipe in the Work holder. 7

To release the pipe from the holder the oper 'a'tor rotates the "sleeves*4| and 49' in counterclockwise direction in Fig. 4, the initial movement of these sleeves moving the jaw 28 outwardly untilthe pin 55 isengaged by the end wall 5| a 5 of the slot 5|, whereupon all of the jaws move simultaneously outward.

In the particular construction shown'ineans are-provided for holding'the-work in the holder in .such offset-center :positiongif desired,as to {3D produce a so-called crooked thread on the pipev when operated on by the thread-cutting mechanism. These means comprise a jaw member 56' in the form ofa screwthreaded-in the jaw 26 which in this instanceds of tubular form. 'When a crooked thread is to be produced the jaw-mem- "ber 56 is preliminarily screwed -i-nwardly the=desired distance 'beyond the'innerend-of the'jaw 23 for causing the pipe to -be clamped in the" desired off center position whenthe several jaws of the device are movedinwaurollybythemchanism above described.

The construction 'shown'in "Figs. 12 and:l3 is the s'ame'as' that'shown in Figs. 1 11, inclusive, except for the means which operate the ring gear 38 (to actuate"the jaws'zfi and fi) and the final pressureapplying jaw (corresponding to the jaw 28) and'its operating means. V

this construction the final pressure applying jaw represented 'at its inner end as repres ented at' fit at which portion it screws 'ina' threaded radial opening I 59 in the ring section |'|,":its outer-end z being equipped with a handle'tll asin the caseof the sleeves 4|. and 49 of the construction shown in 5 Figs-1:11. I I

The ring section |-'|-conta'ins*a recess filat the opening 59in which a rotatable sleeve 62 is located. This sleeve which::'surrounds, andiis spaced"from, the inner end of. the :jaw 51, has a .pinionts which corresponds to.. the',.pinionsii36 associated with thejaws 26 and 21,:and meshes withlthe ring gear through which thejaws- 26 and 27 .aredriven. ..A bushing 64 screwed into the recess 6|"servesthe same purpose as the H55 bushings 3T.

n coil spring '55, under"tension 'tending to uncoil, is located in 1 the space between the 'jaw 51 and the gear sleeve 62, one end 65 O-f -this spring being'c'onnec-ted with the gear sleeve 62 W I The jaw 51 and the collar 61 are connectedtos at*5'| is' externally threaded 5 Q gether to rotate as a unit, but permit of lengthwise movement of this jaw relative to the'collar, by a key 69 on the collar and extending into a longitudinal groove 18 in the jaw 51.

The collar 61 has a radial pin 1| which extends into an arcuate slot 12 in the gearsleeve 62. The spring 65 is normally under tension tending to uncoil, in whichcondition thepin 1| is in engagement with the end wall. 13 of the slot 12.

To condition the holder to receive the pipe. 25, the operator rotates the jaw 51 in counterclockwise direction in Fig. 13 to withdraw the jaws 26, 21 and 51 sufiiciently to permit the pipe to be slid into the space between these jaws. The jaw 51 in this movement moves outwardly by reason of its rotation in the threaded opening 59; the jaws 26 and 21 moving outwardly simultaneously with the jaw 51, by the pin 1| on the rotating collar 61 (rotated by its key connection with the jaw 51) abutting the end wall 13 of the slot 12.

To clamp the pipe in place, the operator rotates the jaw 51 in clockwise direction injFig. 13.

The jaw 51 moves inwardly by reason of its threaded connection with the ring section I1 and the jaws 26 and 21 are simultaneously moved inwardly with the jaw 51 through the medium of the sleeves 34, the ring gear meshing therewith, the gear sleeve 62 and spring 65, the spring 65 being under such tension in the normal position of the parts that through it the jaws 26 and 21 move simultaneously inward with the jaw 51. All of the jaws continuetheir simultaneous inward movement until they engage the pipe 25 under a pressure exceeding the tension of the spring 65. The operator continues to rotate the jaw 51 throughout a partial revolution thus caus' ing this jaw to continue to move inwardly and efiect clamping of the pipe within the holder, the parts assuming the positions shown in Figs. 12 and 13. In this final rotative movement of the jaw 51 the spring 65, because-of its connection with the gear sleeve 62,- which latter has become stationary, is increased in tension, the slot 12 permitting the jaw 51 tothus continue its rotation after the movement of the gear sleeve 62 has been arrested in which movement of the jaw 51 the pin 1| moves away from the end wall 13 of the slot.

The pipe is released from the holder by reversely rotating the jaw 51, carrying the collar I 61 with it, the initial movement of the jaw 51 causing the latter to move outwardly until the pin 1| engages the end wall 13 of the slot 12, whereupon all of the jaws move simultaneously outward.

The construction shown in Figs. 14 and 15 is also the same as that shown in Figs. 1-11, inclusive,'except for the means which operate the ring gear 28 (to actuate the jaws 26 and 21) and the final pressure applying jaw (corresponding to the jaw 28) and its operating means. I

In this construction I provide, in addition to the jaws 26 and 21', a tubular jaw 14 externally threaded at 15 at which it engages an internal thread 16 in a radial opening 11 in the ring section H, the tubular jaw 14 having a longitudinal key-way 18 and being internally threaded as represented at 19. i

The ring section |1 contains a recess 80 at the opening 11 in which a rotatable sleeve 8| is located. This sleeve, which surrounds, and is spaced from, the inner end of the tubular jaw 14, has a pinion 82 T which corresponds to the pinions 36 associated with the jaws 26 and 21 slid into place between these jaws.

and meshes with the ring gear through which the jaws 26 and 21 are driven. A bushing 83 screwed into the recess serves the same purpose as the bushings 31. I

The tubular jaw 14 and the gear sleeve 8| are connected together to rotate as a unit, but permitting of longitudinal movement of the jaw 14 relative to this sleeve, by a'key 84 on the interior of the gear sleeve 8| and extending into the key-way 18.

Threaded in the jaw 14 is a supplemental jaw 85, its outer end being equipped with a handle 86 as in the case of the sleeves 4| and 49 of the construction shown in Figs. 1-11.

A coil spring 81 undertension tending to uncoil, is located in the space between the jaw and the gear sleeve 8|, one end 88 of this spring being connected with the gear sleeve 8| and its other end 89 connected with a collar 98 surrounding the jaw 85 and located in'the gear sleeve 8|. A washer 9| holds the collar 98 in position in the sleeve.

The jaw 85 and the collar 98 are connected together to rotate as a unit, but to permit of lengthwise movement of this jaw relative to the collar, by a key 92 on the collar and extending into a longitudinal groove 93 in the jaw 85.

The collar has a radial pin 94 which extends intoan arcuate slot 95 in the gear sleeve 8|. The spring 81 is normally under tension tending to uncoil, in which condition the pin 94 is in engagement with the end Wall 96 of the slot 95.

To condition the holder to receive the pipe 25, the operator rotates the jaw 85 in counterclockwise direction in Fig. 15 to withdraw the jaws 26, 21 and 14 (the jaw 65 being in. withdrawn position) sufiiciently to permit the pipe to be The pin 94 being in engagement with the end wall 96 of the slot 95, the gear sleeve 8| and the gear sleeves 34 of the jaws 26 and 21 are rotated, moving all of the jaws outwardly, the key and slot connection 84, 18, between the gear sleeve 8| and the jaw 14 rotating the jaw 14 which latter by reason of its threaded engagement with the threaded opening 15 in the ring flange |1 moves outwardly at the same speed as the jaws 26 and 21.

To clamp the pipe in place the operator ro-' tates the jaw 85 in clockwise direction in Fig. 15. This causes the gear sleeve 8| to be rotated through the medium of the spring 81 which, through the medium of the ring gear and the gear sleeves 34, moves the jaws 26 and 21 inwardly and through the key andslot connection 84, 81, rotates the jaw 14 thereby causing this jaw to screw inwardly in the opening 15 simultaneously with, and at the same speed as, the jaws 26 and 21; it being noted that the jaw 85 advances inwardly withflthe jaw 14 turning with the latter as a unit. The jaws 26, 21, 14 and 85 continue their simultaneous inward movement until the jaws 26, Hand 14 engage the pipe 25 under a pressure exceeding the tension of the spring 81. The operator continues to rotate the jaw 85 throughout a partial revolution thus causing this jaw to continue to move inwardly, as inward movement of the jaw 14 has been arrested, for efiecting clamping of the pipe within the holder, the parts assuming the position in Figs. 14 and 15. In this final rotative movement of the jaw 85 the spring 81, because of its connection with the gear sleeve 8|, which latter has becomestationary, is increased in tension, the slot 95 permltting the jaw to thus contin'ue its rotation after the movement of the gear sleeve 8| has been arrested, in which movement of the jaw 85 the pin 94 moves away from the end wall 96 of the slot 95.

The pipe is released fromthe holder by reversely rotating the jaw 85, carrying the collar with it, the initial movement of the jaw 85 causing the latter to move outwardly by reason of its threaded connection with the tubular jaw 'ldwhich is stationary at this time, until the'pin 94 engages the end wall 96 of the .slot 95, whereupon the jaws 28, 21 and 14 move outwardly.

As will be understood from the foregoing; the operation of tightening the clamping jaws against the work introduced into the holder is exceedingly simple requiring the application of force to a single member only for properly centering the work, regardless of its cross sectional dimen-' sion within certain limits and finally clamping it insuch centered position, the first portion of the movement of the means engaged by the operator for actuating the jaws serving to center the pipe in the holder, and, the latter part of the movement of these means, continued in the same direction, exertingthefinal rigid clamping effect upon the work. 7 r

While I have illustrated and described certain constructions embodying my invention I do not wish to be understood as intending to limit the invention thereto as the same may be variously modified and altered and the invention embodied in other forms of structure without departing from the spirit of the invention.

What I claim as new and desire, to secure by Letters Patent, is:

1. A work holder having a plurality of workengaging jaws, and means having a single actuating device operating when actuated to move all of said jaws and comprising yieldable means by which certain only of said jaws are operated inwardly, whereby when said device. is actuated all of saidjaws move inwardly until resisted, by

the work, whereupon said yieldable means yield and a predetermined one of the jaws continues its inward movement.

2. A work holder having a plurality of work engaging jaws, a single drive element and means actuated by said element operating when actuated to move all of said jaws and comprising yieldable means by which certain only of said jaws are operated inwardly, whereby when said element is actuated all of said jaws move inwardly until resisted by the work, whereupon said yieldable means yield and a predetermined one of the jaws continues its inward movement.

3. A work holder having a plurality of worken gaging jaws, means operatingwhen actuated to move certain of said jaws, a single drive element, yieldable means by whichsaid drive element drives said first-named means for moving,

said last-referred-to jaws inwardly, and means operated by said drive element for moving another predetermined one of said jaws inwardly with the others thereof and continuing the inward movement of said jaw upon the yielding of said yieldable means. I I

4. A work holder having a plurality of workengaging jaws, gear mechanism operating, when actuated, to move certainof said jaws, a single drive element, yieldable means by which said drive element drives said mechanism for moving said-last-referred-to jaws inwardly, and means operated by said drive element for moving an-v other predeterminedfone of saicljaws inwardly with the others thereof'and continuing the iinward movementof said jaw ;upon' the-yielding of said yieldable meansp.

5. A work holder having a plurality of workengaging. jaws, a threadedrrotatable sleeve with which one of said jaws has threaded enga fiment,

a spring encircling'said sleeve, a .gear member,

said spring being connected with, said rotatable sleeve and said gear member, and means operated by said gear member for moving the others of said jaws.

6. A work holder having aplurality of workengaging. jaws, a threadedrotatable sleevewith I which oneoi said-jaws-has threaded engagement,

a spring. encircling said sleeve, a gear member encircling said-rotatable sleeve,'a second sleeve rotatable with said rotatable sleeve and encircling said gear member, said spring being connected with said-rotatable sleeve and said. gear men1ber,'said second sleeve having an elongated circumferential recess; a pin on said gear member extending into said recess, said spring being under tension, andmeans. operated by said gear member for moving the others of said jaws. a

7. A work holder having a plurality of workengaging jaws, a singlezdrive element, a rigid drive connection between said element and one of said jaws, and a yieldable. driverconnection b tweensaidelement and the other ofsaid jaws permitting saidelement to be moved and actuate the one of said jaws with which it has rigid drive connection without moving said other jaws when movement of said other work.

8. A work holder having a plurality of'workjaws is resisted by the 7 engaging jaws one of which has'threaded connection with a stationary part of the holder and to which drivingforce is applied for moving all of said jaws, a collar on said la'st-referred-to jaw keyed thereto to'be driven when this jaw is rotated but-relative to which this jaw is longitudinally movable, a spring engaging said collar, and means driven by said spring upon rotating said collar for moving the others of said jaws.

9. A work holder having a plurality of workengaging. J'awsone of, which has threaded connection with astationary part of the holder and to which driving-force is applied for moving all of said jaws, a collar on said last-referredto jaw keyed thereto to be driven when this jaw is rotated but relative to whichthis jaw is longitudinally movable, a spring engaging, said collar, means driven by said spring upon rotating said collar for moving the othersof said jaws, said means having an elongated recess and a pin on said collar extending into said recess, said spring being under tension. 1 s

1-0. A work holder having aplurality of workengaging jaws one of which has threaded connecgear niember engaging said spring, and means driven by said gear member, upon rotating said I co11ar, f0r movingthefothers of said jaws.

11. A work holder having a plurality of workengaging jaws one of which hasthreaded connection with a stationary which driving force is applied for moving all of said jaws, a collar on said last-recferred-to jaw keyed thereto-to be, driven when this jaw is rotated but relative to, which this ,jaw'islongitudinally (Slit part of the holder and to movable, a springengaging said collar, a gear member engaging said spring, means driven by said gear member, upon rotating said collar, for moving the others of saidjaws, said gear member having an elongated recess and a pin on said collar extending into said recess, said spring being under tension.

12. A work holder having a plurality of workengaging jaws, a drive element, yieldable means between said jaws and said driving element actuated by said element for moving all of said jaws to engage the work, said drive element having a jaw portion for engaging the work, and means whereby movement of said drive element after said yieldable means yield causes said last-named jaw to move against the work.-

13. A work holder having a plurality of workengaging jaws one of which has threaded engagement with a stationary part of the holdei and is hollow with an internal thread, a rotatable drive element in said hollow jaw and having a work-engaging portion and a threaded portion at which itlengages said internal thread, and

'yieldable means between said jaws and said drive element actuated by said element for moving all of said jaws, said hollow jaw being movable lengthwise relative to said'means.

14. A work holder having a plurality of Workengaging jaws one of which has threaded .enagement with a stationary part of the holder and is hollow with an internal thread, a rotatable drive element in said hollow jaw and having a work-engaging portion and a threaded portion at which ling device operating during a portion of the movement of said device to cause said jaws to engage the work and in the continuing movement of said means to cause clamping pressure to be initially applied at a predetermined point on one side of the work.

16. A work holder having a single drive element terminating in a work holding jaw, other work holding jaws and a yieldable drive connection between said element and said other jaws permitting said element to be moved and move said first-named jaw without moving said other jaws when movement of said other jaws is resisted by the work.

1'7. A work holder having a single drive element terminating in a work holding jaw, other work holding jaws, a member having drive connection with said element and relative to which said element is longitudinally movable, and a yieldable drive connection between said member and the others of said jaws permitting said element to be moved and move said first-named jaw without moving said other jaws when movement of said other jaws is resisted by the work.

' TIDEMAN M. LILLEBERG.

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