US2375445A - Precision squeezer yoke - Google Patents

Description

May 8, 1945.

H. s. slNEs 2,375,445

PRECISION SQUEEZER YOKE Filed D96. 8, 1943 Agl Jai D.

Patented May `8, 1945 s PRECISION SQUEEZER. YoKE Harvey S. Sines, Montebello, Calif.assignor to Consolidated Vultee Aircraft Corporation, San

Diego, Calif., a corporation of Delaware v Application December s, 194s, serial No. 513,414

' 9 claims. 01. 164-86) I The invention relates to pressure operated tools.

Portable tools now in common use comprise a frame equipped with power means, such for example as a cylinder and a piston, for the operation is supported from a bracket in such a manner that any deilection of or bending in the bracket by the compression forces duringthe riveting operation will not vary the normal relationshipkbeby pressure of a ram r tool which is slidably g guided in the frame anda thrust-receiving bracket with a device, such as asocketdie, for lthe punch or anv anvil for a riveting tool. In the operation of these devices,the compression forces.

of the ram transmitted to the opposed thrustreceiving bracket, for the socket die when metal is to be .pierced or the anvil when a rivet is to be upset, frequently cause bending in or deflection of the bracket. This deflection causes the relationship of the normally coaxial punching tool 'and the socket to be changed, or angular variation between the normally parallel opposed compression faces on the tool and the die or anvil. This results in lack of precision in punching or irregular upsetting in riveting and frequently results in injury to the ram.l In piercing holes where precision is necessaryI it is important-,Ito maintain parallelism of the opposed compression faces and the coaxial relation of the punch and socket or die in order to insure regularity and the true or desired axes of the holes punched -in the Work.

One object of the invention isto provide an improved tool of this type in which the power operated ram or tool-and the coacting thrust-receiving devices, such asv a 'socket or anvil, are rigidly connected by a yoke which is supported at the end of the thrust-receiving bracket and supports the ram at its other end so that any bending in or deflection ofthe bracket, produced .by

Vpressure from the ram, will maintain the opposed compression faces in normally parallel,` or the punch Vand the socketdie in normally coaxial, relation.

Another object of the invention is to provide a precision yoke-structure which may be used as an attachment to the frames of power units.

Another object ofl the invention is` to provide a portable Apunching devicein which the'punch and socket-die are conjointly movable by a rigid yoke so that their compression faces and axial relation Will be maintained notwithstanding any deflection of or bending in the thrust-receiving` yoke-supporting bracket during the punching operation.

Another object of the invention is to provide a pressure operable riveting tool in which the v ram and the anvil are supported by a rigid yoke which is adapted to receive the Work and which tween the opposed compressionfaces on the anvil and the ram. V I

Other objects of the invention will appear lfrom `the detailed description.

The invention consists in the several novel features hereinafter set forth and more particularly delined `byclaims at the conclusion hereof.

In the drawing: 4

Fig. 1 vis a side elevation of a power unit equipped with a device embodying the invention. l

Fig. 2 is a perspective, parts being brokenaway, of the supporting bracket which is attached to l the frame of the power unit and is provided -with an arm for receiving thrust through a socket-die and the yoke for supporting the 'ramirom the thrust-receiving end of the supporting bracket. Fig. 3 is a section taken on line 3-3 of Fig.` 1. Fig. 4 is a section taken on lined-4 ofFig. 1. Fig. 5 is a section taken on line 5-5 of Fig. 1. Fig; 6 is aside elevation of a modied form of the invention.

IFig. 7 is a section taken on line 'l1-l rof Fig. 6.

The invention is exemplified in a portable unit which comprises a casing or frame I0 for power m'eans, such as a piston (not shown) operable by compressed air in a cylinder II for operating a stem I2 which is slidablyl mounted in the frame I0 and adapted to shift a ram 29. The unit also comprises a handle I3 and a throttle-lever I4 for manually controlling the operation .of the power means for the operation vof the stem I2, all of which may be of any suitable construction. In Figs. l to 5, the unit is exemplified as used for punching or piercing holes in a plate of metal and 'the ram 29 functions as apunching tool. l

A generally C-shapled bracket I6 is adapted to extend around or receive the work, such as the plates to be punched or pierced and comprises an arm I6a on the side of the Work at whichthe power-means is located, and an arm Ib extended to the opposite side of the work, the arms .being integrallyconnected by the `bend between them. The arm IBais provided with a groove Il for receiving a flange I6 which. is rigid or integral with the frame II) and ybolts I9 extend through said ange and an extension on arm I6a of bracket, I6

for rigidly attaching said arm to the frame Ill' and supporting the bracket I6. Thefend of arm I6b functions as a thrust-receiving member, on the side opposite the power side.

A pair of generally C-shaped rigid yokes 2I are disposed at the oppositeA `sides of the` bracket I6, respectively. Each yoke comprises a member or arm 22 which extends `to the end of the thrustreceiving arm 'I6b of bracket I6 and a member or am' 23 which extends to the power or opposite side of the work. The ends or yoke-menibers 22 are rigidly secured by bolts 24 and dowel pins 25 tothe end of `arm I6". The arm Ib'thus functions toA support the yokes at the side opposite the'side of the work where the pressureis applied by the ram 29, from frame I at the 'opposite lside of the work. A guide block 21 nts tion of which may vary in hardness, is 'sometimes between the ends of ryoke-members 23 and is n xedly secured to said members by rivets 28 or may be welded Athereto so that the guide block and the ends' of yoke-members 22 willbe rig-l idly secured together and the guide vblock will be supported throughthe yokes from the thrustreceiving end of yarm I6b of bracket I6. The ram 29'lis-slidably mounted lin the guide block 21 for movement to `and from the thrust-receivingarm I'0. `A coil-spring 36 between the guide block 21 and av head 3l on th'e ram is adapted to retract 'the V'ram after a 'pressure-stroke. The ram 29, rguided-win the block 21 at the power, side'of the work,.is1supported by the yokes 2| which are supported from the thrust-receiving endof the arm vIlbfofbracket I6; Clearance is provided, as at 32, between the inner sides of vyokes 2I and the outer sides of vbracket I6. Clearance is. also provided,` vas at 33, between `the guide block 21 andthe adjacent edge of thewloracketl I6.

A socket-dieu is tted on the top face on the thrust-receiving end of the arm I6b of'brack-` et-I6, and comprisesa flange a which is adapted An opening a2 eX- to abut fagainstfs'aid face 20. tends vertically through the arm vlI-(ib for the punch291which passes through the `socket in the die -a which coacts with the punch to pierce a plate.. The socket in the die a and the ram29,y which 'functions as a punch when used with a socket-die, are coaxial and' the compressionfaces F' Ilb by pressure from the pneumatically operable y stem A"I2 which is slidably mounted -in the frame 'of the :punch and the diea and between the lat- Y ytei-and 'face 2B of arm vI6b are parallel. A characteristic of this construction 'is "that the ram or tool 29 ispsuppor'ted vby the arms 23 'of the rigidy yokes 2l which are 'xedly secured tothe thrustreceiving en 'd of the armlb of the bracket I6 and"the`socketdie 'is rigidly supported by said end o'f said 'thrust-receiving arm, so that when the pressure exerted by the punch during la punching operationis suicien't to produce a deection in the 'connecting bend between the arms ofthe bracket I6, 'the socket-die and the punch will both be shifted together and the normal co'- f' axialf relation of the ypunch and the socket in the die and the' parallelism ofthe compression faces onthe punch and on the die will be maintained."j i, "i

In the use of the unit, it will be manually shifted, which may be 'done by 'grasping thel `handle II3 vin one hand and they yokes 2l in the other hand,` to position'the work between the end of arm I6'D and the ram. The pneumatic device will then be operated under control of lever I4 Vto impart a driving stroke rto the ram 29. The metal will be pierced between thel `compression facesgonthe ram and the 'socket-diej on the end ofthe thrust-receiving armi-6b. In practice itis desired to avoid excessive weight in the squeezler yoke'in its entirety because ofthe necessity golf manually shifting it to and from'the work.v The force required to pierce the metal, the composisufcient to cause they pressure against vthe end of the thrust-receiving arm IIiD to bend the brackf y ,et I 6 between the arm IBb and the arm I 6a which shifted out of parallelism with the'normal planeA of the compression face on the ram or so it will y, not be perpendicular to the prolongation of they normal position of the'axis of the ram when the ramis supported in they arm I6a of bracket I6 or in the frame Ill. Whenthis bending occursin my construction, the yokes 2I, block 21 and the ram '29 will be conjointly shifted or deilected,v

the parallelism .between the compression faces on the rain, and the socket-die will be maintained and the axis of the ram will remain perpendicular to the compressionl faces on the die and the face `2E) on arm y`Iliby and coaxially aligned with the socket in the die a. The ram will not be subjected tollinjuriousstessesand'. the stress of compression ci the metal at the point of Vpiercing will ybe `distributed, as desired betweenA thecompression 'facesnotwithstanding the -bending'which has occurred in the "bracket 16,' and `,precision in the holes in the workwill be achieved.

In Figs. 6 and '1, the 'invention is illustrated 7 for use in upsetting rivets.' Infthis formv of the invention, the vstem 3'4 o'f 2a rivet-set 35 ts lin' the opening a2 in the thrust-receiving arm IIIb.Y

The set.has a fla-nge 'which 'abuts against :the L'top face 200i the arm I6b; The rivet-setvis adapted te vhoni a rivet 36 which wil-.1 be upset by the :ram I 29andis substituted 'for the socket-die a. In this' modication the compression faces loff-the rivet-set fand between the rivet-set and arm I 6b, andthe compression tace on 'the ram or riveting tool y-29 will be conjointly shiftedl ory deilec'tedto maintain 'their normal relationship `when vthe compression .forces are suc'ientto produce a bend' in 'the bracket libetween itsxarms, as .be-

`fore described. I- v y i Preferably, fdual yokes are provided for supportingthe ramvfronifthe 'end of vtlie'thrust-receiving arm to'insurefa'gainst transverse movement of the ram, but ithwill be Iunderstood that in some instances 'a single Vyoke may sutce; f

.The yoke structure is adapted 'to-be attached to the frame of a portable powerunitfandmay be applied to `power.units asa -substitute fior brackets withoutfyokes. ,Y

' The invention also 'exemplifies which is adapted -Eor `different work, `suchas :piercing andriveting. The yoke structure is sime Y ple in constructionfand efcient in operation,`

particularlyV where, as in aircraft; precision -is required in thework performed lvby 'the tools;r`

stricted tothe details setv forth, since thesefmay be modied within .the vvscope of' thev appended e claims' without departing from the .spirit'and Thefinvention is not to be understoodas rscope of the invention.

' Having thus described the invention, what i 1 claim 'as'new and desire 'tov secure by Letters Patentiszf L' l. The combination with a portableV frame,

4power operable means mounted in, and portably supported by the frame, for 'operation l atfone'side v of the work, a portable rsubstantially C'eshaped* :bracket havingl one of its members vconnected to ing member onjthe opposite `side joff'th'e'lwork, "of, v

and supported by the frame and lathrust-receiva' yoke structure ing an end portion to which the thrustfrec'eiving member of the bracket is rigidly secured andav member extending to the power side of the work, and a ram operable by said power means for operation on the work andA portably supported by the member of the bracket on the power side of the work, the yoke beingadapted to support the ram for maintaining normal working relation-w ship between the ram and the thrust-receiving member of the bracket when `pressure lfrom `th ported .by the frame for operation at one side of the work, a portable substantially `C-shaped bracket having one of its members connected to and supported by the frame and a-'thrust-receiving member on the opposite side of the work, 'of a portable rigid yoke comprising a member' having an end portionto which the thrust-receiving member of the bracket is rigidly secured and a member extending to the power side of the work, and a portable ram operable by said power means for operation on the work and slidably supported in the member of the bracket on the power side of the work, the yoke being adapted to support the ram'for maintaining normal working relationship between the ram and the thrustreceiving member of the'bracket when pressure from the ram causes deection in the bracket.

3. The combination with a portable frame, power operable means mounted in 'and portably supported by the frame for operation at one side Aof the work, a substantially C-shaped bracket Aformed of a single solid narrow wall with flat side-faces, having one of its members connected to and portably supported by the frame and a thrust-receivingmember on the oposite side of the work of a portable yoke, having a pair of sides in close relationship with the side-faces of the bracket, each comprising a memberhaving an end portion to which is rigidly secured the thrust-receiving member of the bracket and av member extending to the power side'of the work,' and a portable ram operable by said powermeans for operation cn the work and portably support-v ed by the member of the bracket on the power side of the work, the yoke being adapted to support the ram for maintaining normal working relationship between the ram and the thrust-re ceiving member of the bracket when pressure" from the ram causes deflection' in the bracket.

4. The combination with a portable frame, power operable stem mounted'in and portably supported by the frame for operation 'at one side of the work, a portable substantially C-shaped bracket formed of a single narrow solid wall with substantially `ilat side-faces, having one of its members connected to and portably supported by the frame and a thrust-receiving memberon the opposite side of the work, of a portable rigid yoke having a pair of sides in close relationship with the side-faces of the bracket, each side comprising a member having an end portion rigidly sev cured to the thrust-receiving member' of the Jmal working relationship between the ram and the thrust-receiving member of the bracket when s Ka pressure from the ram--causesdeectionin the bracket.

5. .The combination with aportable frame, rpower operable stem slidably mounted inand portablysupported by the frame for operation at one sidev of the work, a portable substantially C-shaped bracket formed orr a single narrow solid wall with substantially at side-faces, vhaving one between the ends of` the bracket-sides at their,v

of its members connected to and portably supported by the frame and a thrust-receiving member on theopposite side of vthe work, of a portable rigid yoke havinga pair of sides in close relationship with the side-faces o'f the bracket,

each side comprising a mem-berhaving an end i ing normal working relationship between the stem Y and the thrust-receiving member ofthe bracket when pressure from the ram causes deflection in the bracket, and a spring between the vram and the block for retracting the ram.

6. The combination with a portable frame,`

power operable stem sldably mounted in and portably supported by the framefor operation at one side of the work, a portable substantially C-shaped bracket formed of a single narrow solid wall'with substantially flat side faces, hav- .Y ing one of its members connected' to and port-y ably supported by the frame and a thrust-receiving member on the opposite side of the work, of a portable rigid yoke having a pair of sides 'in close relationship with the side-faces of the bracket',

each comprising a member having an end portion rigidly secured to the thrustreceiving member of the bracket and a member `extending t'o the power side of the work, a block Xedly secured ends on the power side of the work, and 'a riveting tool slidable in and extending through said block and operable by said stem for operation on the work, and an anvil carried by the end of the thrust-receiving member of the bracket, the yoke f being adapted to support the ram for maintaining normal working relationbetween the ram and the thrust-receiving member of the bracket when' `members provided with means vfor detacl'lablyv connecting it to and supporting it from the frame;

and an integral thrust-receiving member on the opposite side of the work, a substantially C- shaped portable yoke comprising sides in close relation to the bracket, each side having a member with an end portion to which the `thrustreceiving member of the bracket is rigidly secured anda memberextending to the power side of the bracket, a tool slidably mounted between yoke being adapted to support the tool for maintaining normal work relationship between the tool and the die when pressure from the tool causes deflection in the bracket.

8. A unit for attachment to a portable framev carrying power means comprising a portable sub-y stanti'aiiy G-'shaped :soid narrow bracketd'iav'ng one of its members detachably connectabexto :ama-E45 istantiailygmshapedbracket havinga .solid nar- Yand;adaptedto beportabiy suppo'ntedjby the iframe', andan vintegral thrustereceivingmember mounted in thefblook for operation by the power Y' `means a spring lfbetJV-een the tool Aand the block for'retracting the tooland aco-"acting die fcarrie'd'fby the, end fof the member fof the' bracket jat the thrust side of the work, the yoke being3.61am-k edv toisupport the' .tool for maintaining normal work relationshipbemeen the tool anni 'tn-'e die whenepifessurefrorn'the `tool causes ide'e'o'tionin" the bracket. 'l

. "9. Anzinit 1'at-i;achment to "aipontable frame oarryingrpower meansinomfprising :a portabi'efsnb- 4tionioy the power means, a rsprin-g@betwee'n the took-and the block for fretracti-n'g the tool; yand i cIrectaoie to and adapted to be'fpoitabiyrsupported 1 .by the frame, and an integral thrust-receiving mem-heron the lopposite' `side fof thefwork, va Isubstantially` C-shapedl porta-101e 'yoke comprising ks ,iiies in'ciose relation to the sides of the bracket, 1

each yIsideV hav-ing agmember; with( an fend portion towhichihe thrust-receiving 'mem-ber Vof `the binaoket is rigidly secured anda member extending to the power side y'of Vthe ubra-aliena block fixed Ato the lthrust ends between the-yokesidea-a riveting-tool slid'abiymounted inthe .block for 'operar an1=anvi1 rcarried by thefend of themembenfthe bracket at the thrust .side ofthe, Aworlg'xthe yoke vbeing adapted to fsppoit the tool for main taining normal work `relationship between 'the ool andthe anvil when pressure, rompthe-gtool causs deiectioninthe bracket.; i

. v .f HARVEY S. VSINESL-

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