US865712A - Last-lock. - Google Patents

Description

No. 865,712. PATENTED SEPT. 10, 1907.

' B. 0. KRBNTLBR.

LAST LOCK.

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EDWIN 0. KRENTLERWF DETROIT, MICHIGAN, ASSHRNUR 'lO KRENTLERFARNOLD HINGE LAST COMPANY, OF DETROIT, MICHIGAN, A UlillllUllA'l'lUN OF WEST VIRGINIA.

LAST-LOCK.

Specification of Letters Patent.

Patented Sept. 10, 190?.

Application filed May 21, 1908. Serial K0. 317,882.

ings, is a specification, like letters on the drawings 1 representing like parts.

For certain purposes, many shoe manufacturers desire 10 that the parts of the hinged last (of the type shown for instance-in my Patent No. 764,894 of July 12, 1904).

shell be positively locked together. Various locks for this purpose have been suggested and provided, but phe usage of lasts is so rough in most of the factories,

and the strains on the last. are so complicated and ex- 1mm, that I have found it desirable and necessary to devise a lock which would provide a more simple and less complicated kind of look, so loaded and arranged to cooperate with the hinge that it may be read- 29 ily operated and yet is capable of withstanding all the severe usage and strains brought to bear upon it.

'I provide above the ordinary hinge plate a locking piece, operated by an outward pull on s projecting portion, and normally impelled at all times toward 25 ldckingsnd tightening position, the hinge plate being pr'pvided ifll {cooperating notch or shoulder for errgaging the locking piece automatically when the last is moved into lengthened position. The locking piece and hinge plate stand in one and the some vertical plane and are retained by the side walls of s. kerf which they qmlgly fit, merely the operating projection of the piece being exposed in the open gap of the last shove the hinge plate. 7 Further constructional details of my invention will a be pointed oil! 'rh' course of the following descriplion, reference being had to the accompanying draw ings, in which I have shown the best embodiment of my invention at present mmtomplalcd by me.

In the drawings, Figures 1 and 3 are views in side 0 olevstion. of a last embodying my invention, parts being. broken away adjacent the sccanl portion in show more clearly the constructional details; Fig. 2 is a [ragmontary view thereof in .top plan, parts being broken away; and Fig. 4 is unenlargcd view in side elevation.

$ of the hinge connection and locking means, showing more clearly the construction and principle of oporntion.

The forcpa'u-t l and hoelpart 2 of the lost may be of any usual or preferred construction, being herein shown as of the identical construction shown in my before-mew linnwl potent. My lullock i8 intended for use wilhwhai is known as the "2-piece knuckle joint last. in which fl oiorcpsrt is pivotally connected at. 3

to [he hcolpori by a vorlicol hinge-plate 4, sccurcd Q5 rigidly to the hoelporf by transverse pins or rivets 5,

. The rear end of the forepart 1 and thoiorward end of the hcolpart 2 are separated by an intervening open space 7 when the last is in lengthened position as shown, and the hinge-plate is retained in s vertical kcrf 8. Above the hinge-plate, and preferably in the (10 same kcrf, which, for this purpose, is simply sawed longer or higher, I mount alocking piece 9, pivolally supported oil a pin 10 and forwardly and downwardly impelled by a spring 11 retained in a, socket 12 in the foropart of the last, said locking'picce having an extension or projecting portion 13 extending upwardly above the engaging and or looking portion of the locking piece and the hinge-plow and oxlcmling into the gap or V-shaped opening Y. llom'mh Ibis projection or locking piece 9 is o Sllfillltlvf l l or -ngngiug a corrospondingly shaped shouldcr l3 l'xll-mllng upwardly from the hinge-plate 4. Th0 \':-lllnn of the pin 10 with relation to the swinging mow-mom of the heelpsrt. 2 and hinge-plate 4 is such that the resisting pressure or locking strain of the contacting shoulders l4. is

brought in direct line with lhe pin ID at all limos, so

lhat thereby the groalcst slrcnglh and stability of position are assured. The prcssul'c or i-csislancc of said surl'nccs is transmitted directly along a line exlnding from the pivot 10, or, in other words, the engaging surfaccs 14, 15, are approximately at right angles to the radius from said pivot. .The locking or enpaging surfaces and the pin 10 are in a line approximately tengenlinl to the swinging movement of the hinge-plate 4 about its router of movement 3, or preferably the pin li) lies slightly outside of said tangential line.

It will be observed also that in my prclcrrcd construction as horcin shuwh, the surfaces 14 and 15 are wedgeshoped with relation to the swinging movement of the locking piece 9, or are not exactly at right anglee to said are of movement, the surface 14 being prefcrobly formed on the circle shown in dotted lines in Fig. 4, eccentric to the pin 10. This is for the purpose of taking up all wean of the locking surfaces 14 and 15 without permitting any loosoness or uncertainty of locking aciion. The locking piece is retained snugly by the side walls of its holding kerf, said locking piece being set back almost entirely within the wood of the last so that. it. cannot possibly bccomq beut or disarrangcd, but must M; all times stand edge'wise in correct alincmcnt with the hinge-plato 4, so as to tranpmit all closing strains of the lost directly to the pin 10, lhorcby insuring great. strength, pvrumnoncy, and ondursnce. At the some time the conslructiuu is (-xm-mlingly simple and inexpensive.

Having described my invention. what I claim as new and desire to secure by Letters Pnlvnt is,

l. A dividql inst, lmvlm; its hflllnllt and (oi-cont pivomlly cufmcclcd by a verllrnl hinge-plai a shoulder in? log provided: the upper edge or sold Mode-plate, sad I 1 locking plate set on edge in the same vertical plane as said hingepluie and pivotully mounted above the latter in one (if said parts: said lurking} plate having a shoulder for. engagin i'hv Hhullidtl ui mid hingtvpiuic, and being pru- Uided' with pl'ujvvtiun vxlending upwardly aia ve the locking puliinn at tho lu king plate intn ilmnpvn space above said iliimmflatr, and a spring for always hnpeilin said lurking plnlu tmvaalr: int-him; pufillion.

A dividvd lush rmnp isin r a fnrvpari and a heelpnrt, suparaimi at lln'ir mvrling in|| ands Irv an open space win-n in lrng'lhunt d pusitiun. a hinge-plate cunnerliinr, said twn pairiH rigidly Winn-ml tu mm part and provided with an upwardly prnil-t'tinp, shunidul' in muvv with l'rinlion to ilnliltl part, and a lol-king plate sot on mine in said utln-r part. in tin.- xame wrticn] plane as said projecting simnilimg having a un'iprrating shunldur fol engaging said prnjm'ting"Slmnldvr to lock the last in lengthened pusilinn, said locking plate lining pruvillvd with an (Iver hanging, prujectiun extruding: into said upon SIJIH'P allow said hinge-plate. connlrnctmi and urrangrcl to unlock tho parts by an upward swinging movrmvntu! the plate.

locking 3. A divided last, comprising a forepnrt and a heolpart, provided their meeting ends with aimed vertical km'fs, a hinge-plate pivotally connecting said two parts mounted in said kertn and provided with u locking shun] at its edge adjacent the rear wall 0! the torepurt. lot-him: plate set eglgewise in the kerf uf the furepart above said locking plate and provided with'a shoulder for nurmnliy engaging the locking shoulder of said hinge-plate, t1 transverse pin pivotally supporting said locking plate appruxr lnately in tangential line with the arc of movement of said hinge-plate, which includes said locking shoulders and means normally lmpelling said locking plate Inward lucking position, said locking piate having a rearward vxlunsion prnjectinn' into the open gap almve snirl lurking plalv.

In testimony whereof, I have signed my mum in this .N'llll'iiiCiitiDll, in the presence of two subscribing \vilnesse-s,

human liicmmn, (mm I Ilium.

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