US2011967A - Bending fixture - Google Patents

Description

Aug. 2o, 1935. R w 'BROOMHAM 2,011,967

BENDING FIXTURE v Filed July 24, 1935 I 2 sheets-'sheet 1 v5, q, I8 al INVENTOR mzwwmmgm ATTO RNEYS ug. 20, 1935. R w. BRooMHAM 2,011,967

- Y BENDING FIXTURE Filed July 24, 1935 2 Sheets-Sheet 2 INVENTOR j MJ/AMMMM ATTORNEY.;`

Y PatentedA Aug. V270, 1935 BENDING FIXTURE n Richard W. Broolnham, Detroit,. Mich., assigner to Motor Products Corporation, Detroit, Mich.,

a corporation of NewYorkY v Application July j24., 193s,v serial No.,V 682,007 14 claims. (o1. 15s-e46) f This invention relates generally to bending iixtures `and refers more particularly to devices of curvature therein. Y

rthiscl'iaracter for bending strip metal to form a fOne of theprincipal objects of this invention isto improve generally bending fixtures of the Y type set forth by simplifying the construction v various degrees of curvature by'merely `inter l zo aswell as the operation thereof and by reducing the number of parts of theisame to a minimum.

' Another-advantageous feature of thislinven' l tion resides in the provisionvof a bendingfixture capable of morev accurately bending strip stock to a predetermined contour in av relatively shorter time and lwith the minimum amount of manual eifortwor attention.

Afurther objectoi thi's'invention resides inv lthe provision of a bending nxture capable of beingv expediently adapted to bend stripstock to changing the relatively fixed bending die for one corresponding to the vdesired contour. y

Aj still further object of the` present invention which contributes' materially in "obtainingfthe results set forth in theprecedingparagraphs re. v sides in the provision of a bending fixture havingan actuating member movable throughouta predetermined path of travel relativeto the bending die and @having means cooperating with the aforesaid die to bend the stock'to the contour'of the latterincluding 'a shoe connected to the actuating member for advancementtherewith by means permitting" simultaneous displacement of the shoe in a direction transverse to the die. as Well as in a direction transverseto thelatter direction. It necessarily vfollows from this ar' rangement that the shoe will be gudedthrough-A gagement with the die,` and wherein' displacement of the same relative vto the actuating member therefor has no effect on the pressure exerted by the yieldable means. 4This feature prevents the` exertion of undue pressure -upon the strip inthe die ,and provides for uniform operation ofA the xture at all times. f

In addition to the foregoingfthe present in vention contemplates a connection between the y,bending fixture and operating means therefor n automatically releasable upon completionf'of the bending operation so asto permit imparting an4 accurate predetermined. curvature tofthe stock. The foregoingl aswell as otheriobjects will bel Inadefmore apparent as this description proceeds,

f especially `whenxconsidered in connection; wit

theiaccompanying drawings;` wherein:V z :v

n. Figurezlisfa plan 'viewof abendingiixture constructed in accordance with this invention;

Y Figure'V 2` is fa' sectional view taken on` the line (Figure -3 is atsectional vview talren onzthe line 3-3 ofFigure 1; f I

-Figure 4'; is a sectional vview taken on the line' l :Figure 5 is' a perspectiveview ofl thefbending fixture featuring the: clamp forf securing the strip of metal inassembled relation with the die.

r The bending fixture forming the subject matter of this inventionlcomprises a'die. IIlfxedxupon a suitable platform I Ik and havng'fa curved portion' rI.2fcorrespo1f1ding.to the curvature it is desired. toA

bendthe y strip of stock` designated Figure 2 bythe .reference .character I3; "Asshownparf ticularly inligurey 2,.theiouter face'ioftthe dieV is formed with a recess I4 therein extending for vthe full length of the'die 'and having a cross sec,

tionalcontour identical to the corresponding con-l tourof the `stripvstock I3;r The construction is such tofpermit Athe strip `of stock- I3 to beV telescoped,withinthe/groove` I4 from the .rela tively straight end portion of the die, and, in the presentinstance,"r the strip is prevented from axial movement relativeto thedie by means of extendingears I'I spaced from each other a sufficient distance toL receive therebetween an operating lever` I8 pivotally.A connected intermediate the ends tothe earsas at I9. The outer end .a clamp I5 comprising'a bracket lfrlxedito theV l outerfedge of theplatform and having vertically of the operatinglever ispostioned for'convenient Vmanipulation 'by the operator, while the inner end'of the-same pivotally connected toa jaw section 2i) by means of a pin 2|.. The jaw section 20 is formedwith aninwardly extending projection 22 fashioned to extend into the recess I4 of' the vdie amil. cooperate therewith to secure .the strip` I3 thereto whenA the operating handle I8 is in the positiony thereof shown in Figure 5. It will be apparent :from this Iatter'gm'e that when it isl desired to remove the nished strip from' the die, ythe khandle I 8 is merely rocked downwardly about its fulcrum I9 causing the jaw-,section V20'1to movevoutwardly or in a direction away from the die I0 Ya. distance lsufficient toY release' the 'stock therebetween `andfpermit another'strip to beinserted in-v the. die. Obvious.

ly, after the strip has been properly positioned in the groove of the die, the handle I8 is merely raised causing the die section 2!! to move to a position wherein the stripis clamped between the latter and adjacent'wall of the groove.

Cooperating with the die IU to bend the stock to the contour of they groove in the latter isa shoe 24 slidably supportedupon the platformV il as at4 25 and having a projectionl 2S extending into the groove |4'of the die for engaging theouter surface' of the stock i3. As shown particularly in Figure'2, the projection 2 6 preferably corresponds in cross sectional contour to the corresponding shape of the stock so as to have an extended'area of contact therewith and thereby prevent any tendency for the same to wrinkle or otherwise lose its shape upon movement ,of theshoe relative thereto throughout the length ofthe die. In this connection, it is to be noted that the shoe is procooperating .bearing surfaces 2"! onthe 'die and i shoe not only guide the shoe throughout its movement relative to the die, but, on the other hand,y

prevent `exertion of unduepressure on -the stock during the bending operation.

The 'mechanism for moving. the., shoe .relative to the die comprises an .arm 301 :mounted .forA

rocking `movement in a substantially horizontal plane and. having the i inner end ljournaledbe-"1V tweenga pair .of'spaced bearings 3lY upon valpin 32 which in turn is iixed to theplatform Vl l The free end of. the arm is operatively connected toV the shoe 24, but is not directly" connected thereto, g since if such were the case, the shoewould be compelled to move around the `iixed offswingingmovement of the arm 30,*andthis would be objectionablev in that ituwould restrictbending the st'ripsvftocurvatures having a'c'enterfcoin-vcident with theax'is* of swinging movement of the arm. In ordervto ,provider for bending the. strips to any particular'degreeof curvatureirre-` spective ofthe location of `the. 4axisl of swinging movement of the armrelative .to vthefcenters of. the curvature in the die and at the same time to permit employing the same iixture :with dies of different degrees of curvature, I provide the, following structure@ 3 i InV detaiLthe operative connection between Athev shoe and arm comprises'a vmember 33 interposed between the arm and shoe 2B..as s'hownpa'rticularly in Figure 2. connected intermediate .theends thereof f to the underside of vthe-,arm for swinging movement relative thereto in ar horizontal -plane andisproi vided at the extreme inner end Withfa roller '344 engageable with the 'vertical innerface 35 of thev die which is uninterrupted throughout; the lengthv thereof'so as to accurately guide the. member 33 f along a path coincident withthe longitudinalcon- 'tour-'of the die;

the curvature 'tof the die may be "closerto ,the` axis of swinging movementrthan other pointsi-'itv is necessary to Vvprovide'for sliding movement o'f the member 33 relative to the arm 30 in the direc--y Inasmuchas certain points on tion of length thereof Virl addition to-theiaforesaid relative pivotal movement between these parts; Both the sliding Tan-d pivotal movementsof the member SBrelatiVe-to the arm'30 .are .obtained i by a .pin35 having the.lowenendithreaded in the;

- toy swing-about ,the iixed vaxis of the `pin 32.

detail'the connection betweenthe shoe 124 and, member 33"c0mprises a pair of blocks 4I and 42 The Ymember 33` is pivotally member 33Y intermediate the ends thereof and having the upper end projecting through a slot 31 formed in the arm 3Q. The slot 3l is elongated in the direction of length of the arm so as to provide for the desired sli-ding movement of the member 33 relative thereto, and the width of the slot is such as to prevent movement of the pin 3e in directions transverse to the slot 3l. Disengagement of the pin 36 from the slot is prevented herein bymean's of a washer39 xed to the upper end of the pin as at 4Q and having a diameter greater than the width of the slot so as to bridge the' same.

Y From the foregoing construction, it will be observedthat the connection between the member 33 and'arm 35 issucn asr to not only permit advancing the member 33 upon rocking movement of .the ar`m30 about the axis of the pin 32, but to also simultaneously provide for swinging the member33 relative to the arm about theaxis of the pivotal connection-,38, and inaddition,r permits the lmember 33to shift radially Withrespect to the axis of rocking movementof the arm 3).

Movement of the member 33 relativeto the varm 30`is: controlled bythe' curva-ture. of the die, Vdue tothe engagement'of4 the roller 34 with one sidel of lthe diexandto the engagement of the shoeV 24- Y with the .opposite side v'of' the die.; `T he'shoe 24 is operatively connected to the arm 33 for move-` menttherewith, or in otherwords is mounted for displacement relative to the arm 3Q in directionstoward andawayfromthe axis of swinging moveable in two directions.A transverse to eachother,

Also, the two,direotionsfiust.referred to may be saidY to be `transverse to thefdirecti-on of vmovement V'ofjthe arm treinte the latter is compelled In slidably supported;` by the member 33 in a T- shaped slot 43 formed inthe latter member in the directionof lengthpf the same.

44 normally engaging the o uter face of the shoe 24'between vertically spaced shoulders 45 formed on the latter.'l face of the shoe. VIn this connection', it is o benoted that the point of engagement .of the abutment with the shoe and the line of 'engagement fof the roller 34 4with the die are substantially in `alignmentwith the projection 26 on thesnoeso as to insureeflicient engagement o'ffv the latter with the stripof metal in the die.-

In the present instance, the abutment 45t is held f in assembled relation with the shoulders 45 on Ineans'of` the P11151; -ff'lie construction issuch rI he block is provided with an inwardly extending abutment beam 5 2. As shownpartcularlyinFiguren, t e

thatmovement'ofjtheoperating handle 50H1' if Wardly about its pivotal -connec'tionf'l'f member 33 effects anoutwardfmovemen o the block 4l relative'to the block`42nd thereby r' o'luees` the tension on the yspring Ity relieve j' the' p iessi'n'e` exertedby e thefpro-jectien of the; s ho'e4 on the` i strip." f On 'theother hand,` dow'` vWard movement oftheopeating "handle fom'thefpos'iand tens-ions'the springr` H6 so that the"'lattr**will v exert lthe `desired pressure on the shoe through the' aeti'on-ffof'the IblovclLt-"llv `v aforesaid yieldablemeansandfassociatedshoe af f Wvv: that any' displacement-of the-member@ or therfofA ,extends it@ a. metten; wher@ 'if maribe- 33T; Cvolveniently grasped byan'operato'r.l rl` Th eam 52 is connected intermediate thefeifids tofthe'arm pivotally conne'ctedf'for swinging movement about horizontal aiis *to a' bracket 5 5 lQcarrie @yg-the; beam `52. The freeendfof the""linger egteridsfai Sufcieht-disten leibelow the, ,beam 5.2.:'510 Sie er1-i gage the'front edge'oithejarm 30 as 'clearly shownV inf yFigure 5,y "and is ric'irrrijP14115?k heid from swinging;

mov'ementiaboututhleaforesaid airisby means off Y l a clamp 56 carried bythe bracketf5.5fbelcw`v`fthe clamp 55 Vcomprisesv a pair offjavvsSlfand'S 'lqi oatedupon opposite sides'fo'i" the "lower end ofthe bracket and having the rear ends piyotallyfsupjf ported from 'thejbracket by'means;of:`pi1f1sf59i The free ends" of thejavvs are providedl with en larged portions 5 0 forxning s lioulde'rsf` I' j for' enj-f gauging `the front sideof: the 'finger 511" adjacent opposite edges tlfiereof"` Thefshoulders 6I 1 are normally'V jyieldably 1 Vmaintainedvv .infj engagement` with the fingerv 54 byr neans'y of a relatiyely'li'ght spring 62`finterposedi between" the pivotedf endsi Y of vtl'iefjavvs beyond "the v.pivotsf5'9 l and arejposi-g tively heldin assembled relation withv the' "linger by means ofa latch'BBmCi/able overxtheiree 'ends' of the javvs. VThe-lafli 63 comprises alever havj-- ingl a slot B4 therethrough of sufficient dimension to receive'the ends Aof `the vjaws-y and is-pi`votally; connected intermediate the 'ends *to V:the xj avv 58 for Vsvvingingmovement out ffengageinent*with thev'jaw'5'i by means' oa pin 5 5". f The 'latchis normallyfheld fin engagement with `both'fjayvsloy means -of` a', spring" having'one end anchored; to the side of the j'aW 58 and havingtheopposite end'connected to thelever beyond the# pin 65 as shown in Figure/Yi. v The ireeV end 'of thel latch lever iextend's vlaterallybeyond the javi/"f1 5] lso: as.` to engage a suitable trip 68 mounted uponfthei bed il 'ofthe'xture i' Assuming' that. the several nparts Vof Ythe Aivirture are inthe relative positions thereof shown in Figurefwherinfthe nngefsllfis heid" againstpivotav movmeiitfrelative thefbeagmtby theljaws andu thjt the-'lbams m'ovdinfthe direction 'or the ar "owl sonni-Figure -15 it wiuflbefnoted that ba'r duel tp lthefegagmentefJ the ringerthere-'j With' v During the nal-movement lof fthe bending fixture -"re1ative 't simultaneois"fmovernentof l "the shoe relative toa said rirein b'ei",V in,tvvo directionsA transverse to each otnerand 1to` -.th'e, direction oi travel thereof by A j n "ng Qfxture having rl in fcombination,- means yfor supporting a stripofstock'tojbe bent,- means rior-bending `said-strip i to l 4a predetermined degree of curvature including jafs'hoe engageable` with; said` st ripjr and? movable 4relative Athereto in.V

the direction of length thereof;, yieldablemea'ns acting `upon the shoe. fonurging the jlatter in-a.

direction-f transversej toy the directiony off-' 'tno-'ve-v ment aforesaid. tllereotteward the,String21--fri1ein5-A berlhayinga predetermined pathaof tra-vel, and a connection between: the1 mn1bei-qfand shoe. operablel toadvancethe-latter relative `to jthe Ystripand tofpermit simultaneous'displacement'of the shoe. relative tojthemembergin adirection op-v posite to lthe direction .of-faction;offthefyieldable P means Without. increasing the pressure exerted byyithe lattenen-thef-shee.fv .s 3.` :A 1 bending 1 :f xture ha ng n Iinw combination; means for-1 supportingga;stringofstock to i be Ybeni` means for bending said strip to a predetermined degree of curvature ineludlns: e ensbeeble; with said lstrip and. movable relative thereto in the direction .ci -lensth thentoix vieldeble means. not-` ing unen the shoefor ureinathe-.latter infn di.- rection transverse tothe direotion ofmovement.

aforesaid thereof toward .thestrim a member henk tien. between the member .and ,shoe operable' to edfvanee the letter-relative. to tbeetrip nndto permit Simultaneous. displaoementof the shoe relative to the .memberlntbe direction of notion-oi Seid vieldeblemeens, 4.. A bending iiirture having in eombinetien..

means for supporting esti-ip. eistoelr tobelbenta means for; bending` seid strip. vto nv predetermined deeree. oiourfvature ineludins. e Shoe enseeeeble with .said strln and movable reletivetheretofln thedireotion of length thereon. a member.- mounted for rocking movement about annee axis., and. a. connection between .Seid memberand Shoe one.

erable to advance the latter relative to the stripv and. to permit Simultaneousdisplaoement Vof the shoe relativefto the member in direotionsredlellyj with respectv to the ax-is of` rockingmovement rof said member and also inrdlrectionstransverse to said lradial directions. -V

, 5, A bending'fixture` having in Aoinnbination.` means. for Supporting` av strip. of stoekto be bent, means for bending saidtilpto a predetermined degree ofcurvature including a shoe engageable Vwith said. strip and mevablerelatve thereto-in the direction of leneth thereof, a member mount-Y without affecting Athe action offsaid lyieldable.

means.

Q6. A bending fixture havingin c.ombination,.a V die having curved nortionjeorrespondinsj to they degree` of curvature itis' desired tQimDflt. t0. 'tif Strip oi stock;y a shoe movable along 'thelou'rved portion oi the'die relative thereto and. cooperate ing therewith to bend a strip vo1' metal tothe curvature of the saine;` yleldablc means normally acting Aupon theshoe for moving Vthe Vlatter in' al direction toward the die, a, member mountedfor rocking movement aboutie. fixed. axis', and anon-f nection between said member and vshoe"opererable to move the latter` from thevformex'l along a path determined by the contour of the diegirrespetive of the locationof said axis relative to the curved sectioriofthe diel Without aiectingthe L action of saidl yieldable means,

"1. A' bending xture having vin 'cinfnbination, a

die having a curvedportion'corresponding to the degreev of curvature it is desired to' impart to a stripv of stock,vr a shoe. movable alongv the curved portion ofthe,de'relative'thereto and cooperating" therewith torben'd a strip of metal to the curv' ature of the same! a member having a fixed path of travel'inV a. plane substantially `parallel te the plane of the die, and a drivingconnection between said member 'and shoe'per-mitting movement of the latter relative` to the former in directions transverse to the general direction of advance-Y ment of the shoeV bysaid member.

8. A bending ixture having in combinationfa die having a curved portion corresponding'to the degree of curvature it is desired to impart -to a strip of stock, aslioev movableA along-thecurved 9, Af'bending fixture having in combination, a `die having a curved portion corresponding to the degree-of vcurvature itis desired to impart to a strip .of stock, a shoe movable along the Vcurved portion of ,thel die relativevthereto and VcooperetinethereWit-h to bend` .a Strip. of metal. to the curvature of the same, amember mounted for rocking movement,l about a iixed taxis, a second member oonneotedto the member aforesaid .for pivotal movement relative thereto inv a plane .parallel to theV plane. of movement thereof end also f ofrfslidinvg)l movement radially of the axis of roekina movementl oiA the, Same, means operaf tively connecting saidshoe to theseconi member t at one side oi 'thepivotel eonneotion of. the letter with thefirstrnexnber,andlmeans carried by the second member at tneopposite side otthe aforosaid pivotalconnection for 'engagingrthe side of the-die oPPoSitelthe side thereof wim which the shoerv engages tooompelfmovement of the eeoond member vtlrrou ghout apath corresponding to the curvature-ofthedief Y il);A A bending ixture having in combination; a die having a curved portion corresponding to the degree'of. ourvature it is. desired to impartito e strip ofi stools, a shoe movable alongV the curved portion of the :die relative thereto and cooperating therewith to bend a. strip of metal to thecurvature of t the saine, a member mounted for rocking movement abQllta fixed axis, a sec-V ond. member oonneetedto the member aforesaid for pivotal movement relative, thereto in e plane yparallel. to the` plane oflnovement thereof and also forsliding movementradially of the axis of rocking movement of the same@ means operatively connecting vsaid'shoe tothe second mem--` ber, and ineens oomneuing movement o f the second member along a path corresponding to the curvature loi the die irrespectiveA of the location of the axisoi rockingl movement of the .first meme berrelative to the curved portion of. the die.`

l11'. .A'bendlng iixture having in combination', aV

dihavinga curved portion corresponding to the degree of curvature itlis. desired to impart. to a o strip of stock, a shoe ,movable along the curved 'portion of the die relativerthcreto andcooper.-V Yating therewith lizo-bend a strip of metal tothe Veuri/alture of' the ineens for moving, the

shoe relative to .the die lil the direction of length of thelatter rinoliicling. a member ymounted for movement lthrough.out a .predetermined nath of f travel.. 'ar second amember operatively oonnected,

to the Vmember aforesaid for actuating theosame,V andmeens iorgreleasins the connection between seid members 'et e predetermined point. in the path of travel. offline lSJ named. milbei'.

ed for rocking movement about a fixed axis, a second member connected to the member aforesaid for pivotal movement "relative theretoV in a plane parallel to the plane of movement thereof and also for sliding movement radially of the axis of rocking movement of the same, means operatively connectingv said shoe to the second member including yieldable means normally arranged under tension between the shoe and a part carried by said second member, and means for releasing the tensionof the yieldable means to release the pressure yexerted on the strip by the shoe.

13. A bending Xture having in combination, a die having a curved portion corresponding tothe degree of curvature it is desired to impart to a strip of stock, a member movable along the curved portion of the die relative thereto and Velement along a path correspondingto the curvature of the die,y and means operatively connecting said member yto the second named element in-V cluding a spring carried by the second named element and acting upon the member tending to urge the latter in a direction toward the die.

14. A bending xture having in combination,

a die having a curved surface at one side cor- Y responding to thepdegree of curvature it is desired to impart to a strip of stock and having a cam face at the opposite side corresponding the latter andproviding for displacement of the second element relative to the first element in directions transverse. to the path of travel of said member and a cam follower upon said second named element inengagement vwith the cam face of said die. RICHARD W. BROOMHAM.

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