US1139040A - Collapsible last. - Google Patents

Description

W. A. 'KRENTLHL Y coLLAPsIBLE LAST. APPLICATION FILED JUNE l2, |914.

Patented May 11, 1915.

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WAL'EnA. KRE'NTLER, oF DETROIT, lammeren, AssIGNoia To KRENTLER-AR'NOLD HINGE LAST COMPANY, OF DETROIT, MICHGAN, A CORPQRATION 0F MICHIGAN.

" ooLLAPsIBLE LAST.

Application filed June 12|, 1914. Serial No. 844,665.

To'a'ZZ whoml it may concern:

Be itknownthatl, VALTER A. KRENTLER,

a. citizen of the .United Statesfand resident of Detroit, countyl of' Vvayne, State of Michigan, have invented an Improvement in -Collapsible Lasts', 1of Which the following descriptiomin connection -with the accompanying drawings, is a specification, like letters on the drawings'representing like parts. l

My presentl invention-is an improved colllapsible hinged lastof the type illustrated in the prior Pym Patent No. 673,889, showing the original collapsible .last construction; My present collapsible 'last is also intended to employ the locking feature, and improved hinge construction, so 'far as' the same `is possibleof my prior patent- 1,094,153. My

saidl patentillustrates a. novel form ofI knuckle jointlast, with thel hinge members anchored at their ends most remote,fron i the pintle or hinge pivot on ivhich the parts swing-,so Athatthe solid Wood ofthe last vrilltake' thcstrain and relieve thelnuckle portion of the wood from the 1breaking strain and pressures-of lasting. machines,

leveling machines, heeling machines, and the like,"

An important featureof'inyy present collapsible last construction is that thel hinge members'constitute interlocking` devices to aid in taking up the torsional tivist and strain brought thereon, one hinge 4member beingr inthe form of a.l rounded tub'ular memher fitting;l snugly" in a hored'recess in' one part, preferabliv the forepart of the last, and

the ,other hingemember being a'plate' member,' fitting tightl)y in a savv kerf of a. width substantially'equal to the. width of the plate, and this plate is pivoted through the. tubular xmember, which is slotted to receive the same.

Furthermore, this plate-v is-provlded ivlth an extensionl to engage' the collapsible instep block and depress the same, automatically, when the forepart and heel part of the last are broken or Hened' for the removal ffrom or-'in'sert-ion in a shoe.: By having the plate.

member thus held b v the ivalls of the savv kerf in which it fits Aand also fitting' in the' lslot adapted to vreceive said plate atQthe pivotal portion ofy the tubular hinge. member. the tubular hin'gze is necessarily.prevented fronrturning .or twisting' in the forepart,

:and therefore this :tubular n-ieniber-does not .depend wholly uponthe rlvetor pin which anchors the remote end thereof for its torsional strength. l

Other features of thev invention, details of construction, and novel combinations of parts, will be hereinafter more fully point ed out and claimed. i Referring to the drawings, illustrating a preferred embodimentof the invention, Fig-y ure l is a side vieiv of a last, with-portions broken airajiyand a part ofthe lockingr de'- vice shown in cross section.;` Fig, "lis-a view of the last when lexedor collapsed, portions being broken aivav. and also parts being fshoivn in cross section 1,' and Fig. 3is a top plan vieu' of the hinge members.

I prefer to emboliV the present invention Patented. 31113414915.'

` in the socalled knuckle `icint orA Kant- .brake type of hinged last.'and to arrange the coilapsible instep portion on a line of cut. and spring substantially as shoivnin `Unite`d Statesy Patent No. 947.972.

As illustrated in the annexed the 'forepart l of a. divided last isprovided with its instep portion 2I separated from the for'epartl by a cut vout section indicated by the curved lines of cut el', l .leaving the \vood"of the lastof both sections l and ,2 integral at the point 5. The heel. part, 3 is divided from the forepart l by a partially curved line of cut 6 and partially straight `out T, tov provide the .knuckle joint construction explained in said prior Pvm patent, 'the' forepartfand yheel part l. e1ng-further pro.- A

" vide'dv with secant faces' Sand 9 respectively inthe upper portion of the last to permit of the relative pivotal movement or liexinp,r of the 'tito parts when moved Aon -the hinge members. In the forepart l I bore a recess lO to receive the. tubular hinge member 1l,

which member is anchored to the wood of.v

the forepartbv a pin l2 passing 'through holes provided thereforfi'n the member-lh,

-and through thesolid ivood portions of the 5 Th e last, remote from the, pivot pin l-.

yforward portion of the tubular member 11` is`slottcd at 14 to receive.the'hinge-platcto be described, secured inthe heel part. The heel part 3 has a vertical saw kerf 13 formed vtherein of appropriate.width to ref'clve the hing-e plate 1G. \vhicl1'plate is. anchored .to

the heel portionbfv the pivot pin 1T. passing'- throirgh a hole therefor in'the plate 1f and through the solid portions of the heel remote'from the pivotpin 13, which pivot pin also passes through a hole provided therefor in the forward portion of the plate 16, as Clearly1 indicated in the drawings. This plate 16 is adapted to fit closel)vv through the slot 14 in the tubular member 11, so that it is firmly and pivotall)Y pinned to said tubular member, as well to the ivood on either part of the member v11 in the projecting k-nuclrle portion of the heel part.. This knuckle portion is furthermore bored 'ally as indicated on the line 1S, to receive the projecting end of the tubular hinge member 11, this boring being in elieet acounterboring partially included 'within the saw korf 15.

In order to etlect the collapsing feature, depressing the instep block 2 when the last is collapsed and forcibly expanding the same when the last is straightened, the portion 2 is provided with a saw lie-rf 19 to receive the projeeting portion 2O oi' the hinge plate 16, said projecting portion having a cam groove 21 formed therein and adapted to tit about a pin' 22 passing through said cam groove and through the nood of the last on either side of the savv hert 19, The cam path 721 may end in a slightly enlarged seat 23 into which the pin Z2 will snap when the'last is completely flexed and the instep portion in final collapsed condition with the faces oi the lines ot out l. *l in Contact and the opposite secant :tacos S and 9 preferably also t in contact as illustrated in Fig. 21

in automatic loclr is provided, consisting #dinger or ballv preterabljvvv 'of hardened eel, both heing entirely concealed vvithin tine tut-nier member 11. with the spring sea on the pin .an exerting expansive tension through the ball 25 on the plate 16.

'lo operate with the ball Q5 and spring 2 V[orio the edge of the plate 16, Where said plate is fitted through the slot 14 of the i 1lar hinge member 11, in the form of im to he engaged by the hall E5 v." in extended position and to th f i a locking device as may "ig initiative flexing, 'x start theflexi t? ll an last is lien tno last pai 's line of tensio rted by the 1 A sill hold the -1 I "ved,

e a lo nig cle-rice tion, ano to in platel is oess the pin 1will in xtreme c l reces o .vhie

' the last this enel t provided snap as a' an eipansible coiled spring and a` and recess 27. The recess i7 n The operation of the collapsible hinged last vvill, it is believed, be clearly understood.

The engagement oi the Cain plate 21 and pin 22 are such as to collapse or spring the instep portion of the torepart 1 inwardly during the lit-Xing of the lorepart and heel part on the pivotal hinge 13, while the reverse movement to expand the last, forces the instep portion outwardly into its norma-l or expanded position by engagement of the pin 22 on the shorter :tace of the cam groove '21. IThe arrangement of the tubular member 411 and plate 1G verz-'ite to ffreatly assist the entire .last in inannaining original form and rigidity, the plate 16 in the heel part, being supported by the side walls ol. the savv hert' 15 as already explained. Furthermore the plate 1G', having its firivardly projecting portion 2() lirnily supported hy the side Walls of the saw lierf 19 in the instep portion 2 of the orepart, aids greatly in holding the forepart, heel partand hinge member 1l all in proper alinement.

It will be appreciated that. it is of great importance to maintain the forepart, heel part and instep block in their normal relation, both4 in alineinent and contact, especially in a Collapsible last, to' prevent any parts from Working loose during use. As soon as a pivot, a last hinge, a bearing socket, or the keri's or sockets for the hinge parts, become the least Worn', or loose, thev forepart and heel part are quickly driven apart, lose their shape, style and usefulness,

and the last is necessarily discarded. By 100 my present invention, utilizing the remote anchoring pins 12 and 17, and the coperating supporting Walls of the kerfs 15 and 19 for the hinge plate, to hold all the -last parts,

as Well as the hinge member 11, in alinement 105 .and torsional strain, I have proc" d a collapsible last capable of suce y withstanding the great strains incident to the use oit' modern lai-fili speed shoe machines, ynovv in sach al ,i prior construction of yeollapsibl lasts failed to stand up satisfactorily to these requiremei l it :nv present invention has enabled le lasts to be again commercially position to re i ,stribed my invention, Whatl ev.' and desireto secure by Letters lient ist collapsible hinged last, having in com 120 hination, a divided forepart -having` a bored socket and a movable instep portion having a. vertical. saw hert, a heel part having a vertical nerf in central, intersecting, lon almement with the rear'oi` said 125 M with the first named saw leril, a. tuoular innere-d member. fitted in said bored the iorepar; and projecting rearvivardljf troni said i'orepart into the heel part Where it is provided with a vertical slot 13) The the present eXactingshoe-factory alined with said two saw nerfs, and a hinged plate-member fitted in s'aidsaw kerf in the heel part nfsupported engagement with the walls adjacentsad* kerf,' occupying thev slot in said' tubular hinged member, and connceted to the latter by a ypivotpn n the heel part, passing through said Yrear outer end of, the tubular hinged member, said plate? member'having er.projectingy portion fitted- Within the sayY ker of said linstep portion nd supported by the vWalls of said last memtioned saw korf and having a cam groove and pin connection with said instep pornon, and said tubular hinged member being' ironisverscly anchored at its forward @mi within the ''orepalt beyond its pivotal connection in the heel part, with saic plate-nn: In testimony wher-@oil 11 i t name to this spezieftien? n iin... twol subscribing with :it

WALTER A KRENTLER. VVnnesses:

E. O. KREN'HJER, MINNIE R. B011F91,

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