US1372779A - Last - Google Patents

Description

e. G. SCHELTER.

LAST.

APPLICATION HLED AUG. 8, 19x9.

Patented Mar. 29,1921

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.enoraen e. SGHIEL'IER, or aocrrns'rna, NEW YORK, sssmnos. ro Firs-EMPIRE Donner. PIVOT LAST COMPANY, or AUBURN, MAINE, a coaroeerxon or MAINE.

MST.

Application filed August s, 1919. Serial No. 316,215.

vTo all whom it may concern: 7

Be it known that I, GEORGE G. SoHEL'rER,

a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented certain Improvements in Lasts, of which the following description,in connection with the accompanying drawings, is a specification, like reference characters on the drawings indiin the shoe it should be held in the normal,

or extended position with sufficient rigidity to. avoid any danger of its collapse during the shoemaking operations. The shoe is in- Verted during many such operations and also during the last pulling operation, and if a positive lock is used, it is therefore necessary to move it, and in general to hold it,

out of operative position at the time of removing the last. pliance in connect-ion with the jack used in withdrawing the last. Inasmuch as it is This necessitates some apsornetimessiecessary to withdraw the last at other times than the regular last pulling,

' such a lastlock requires special jacks located 5 more or less widely over the shoe factory. the

jacks being so specialized as to render them inconvenient.or-impractical for use in connection with lasts of other makes. manufacturers areunwilhng to equip their factories with such special jacks, and this has mitigated against the use ofhinge lasts having positive locks. Hinge lasts with lock which are not positive are widely used, because the lasts can-be collapsed and withdrawn on" any jack, but such lasts sometimes meet with criticism because of their lack of rigidity." r

The present lnvention provides a novel construction of last having a positive lock, the locking element of which can be moved and held -out'of positive locking position so that accidental return thereto is avoided.

The positively locked condition can thus be terminated with the last in any convenient position in the operators hands. and will so remain, so that no special jack is required for operating the last.

It 1s an mportant object of the present invention to provide a hinge Shoe , desired forms.

Specification of Letters Patent. i Patentefl M 29 1921 last with a positive lock requiring no special tools for."

its manipulation, and accordingly a feature of the invention resides in alast having a positive lock arranged to be rendered impos tive at will. lapsed on the ordinary jack, and removed without difliculty, at the same time afiording the desired rigidity and without sacrificing any of the advantages of known lasts.

so Thelast can thus be col v I I Stated from another viewpoint, the. in-

vention provides a collapsible last having a positive and an impositive locking means. and provision for rendering one of said mean?1 operative and the other inoperative at wi operate'with an abutment in turn, one 'i'or positive and the other for impositive looking, and means for shifting one of said sur- The last illustrated has a locking member with two surfaces arranged to co faces into operative position in place of the v other. i

A further important feature of the invention resides in provision for rendering the last always positively looked after being straightened or extended, This is accomplished, in theform shown, by an automatic means for throwing the lock shiftingmeans out of operative position, preferably'as the last collapses, but in any case before the last reaches extended position. I

Another feature residesin a construction whereby the last parts'are relatively displaced slightly from normal extended positionwhen the last is impositively locked.

These and other features of the invention,

comprising various arrangementsand combeen rendered 'impositive.'

Fig. 3 Shows the last artially collapsed.

Fig. 4 shows the last completely collapsed.

Fig. 5 is a cross-section on the line 5-5 of Fig. 1. I

The last shown is a collapsible last having a heel part and forepart separated by secant faces and united by hinge mechanism of any I have found the last invented by John C. Schelterwhich is disclosed the front, as .shown at 12. until it reaches 'appoximately the. center of the last. At this point the heel part and forepart separate, the cut going upwardly and inclining slightly to the rear upon the heel part, as

'shown at is}, and forward. as shown at 16,

upon the forepart at a somewhat greater slope than-the portion 12. as far as a point about three-quarters of the height of the last and from there nearly vertically, as shown at 18, to the top of the cone. The fore and heel parts are united bv two links 20 and These links are preferably formed in duplicate with the locking mechanism between them as shown in Fig. 5. The link 20 is formed of two separate parts 20 and 20 and the lower link 22 being similarly formed of two parts 22 and 223. llhese: links are joinedto'the last parts by rivets 2.4:, 26. Q8 and 30, passing through the links and seated in the last parts. All the foregoing structure is substantially as shown in the application of John C. tichelter above. referred to.

The rivet 526 acts as an abutment for the locking means. The locking member is shown as a. [lat steel plate 32 pivoted at one end upon the rivet 30 between the plates 22- and 22*. It has at its other end a downwardly projecting lug 34- arranged to engage a spring 3G seated in one of the'last parts (as illustrated, the forepart), and has on the upper surface of the same end a projection 38 arranged to cooperate with the pin 26. This projection 38 has two operating surfaces, one of which, 40, is substantially perpendicular to the radius vector 42.

extending thereto from the rivet 30. and the other of which, let, is at an acute angle with said radius vector. The portion 40 when in engagement with the rivet 26, as shown in Fig. 1, will positively lock the last in extended position since the reaction between the pin 26 and the locking member is substantially perpendicular to the surface 40. But if the locking member is moved an; held in the position shown in Fig. 2, with the surface 44 in engagement with the pin 26, a collapsing n'essure will :ause a relative slipping motion between the pin and the surface 44 which will permit the last to lapsed by pressure alone.

movement of the member 32 may be contrived in various ways, but I have found the following described construction advantageous. A member all) is pivoted, prefer ably upon the pin 24:. and has a hole 48 con veniently located in it to receive a ball 50 and a spring 52. The member to is located between members 20 and 2t) and the spring-pressed. ball frictionally holds the member is in any position in which it happens to be. The member 4-6 has on its lower surface a lug it and a lug 56. The lug 5%. as shown in Fig. 1 normally rests on the upper surface of the member 32. The member 4.6 extends up into the opening 57 between the last parts so as to be easily acces" sible to the. operator. When displaced by the operator it forces down the member 323 so that the surface A is exchanged for the surt'aeedtl in contact with the pin all At the same time. the lug, 56 slips down behind the projection 38, and wedges the member 32 firmly in the position shown in Fig. 21

At the same time. the stress exerted by the spring 36 rotates the links 20 and 22 and the lock member slightly so as to cause a slight relative displacement of the last parts, all of whieh is clearly shown in Fig.2. This displacement serves as a warning to the operator in case the last is in a shoe, that the last is impositively locked. v

The last is now collapsible by pressure alone aud can he removed from the shoe by the siinple aiid well-known expedient of putting the last upon an upwardly extending jack pin and manipulating the last and shoe in the ordinary manner. This will eansethe last to pass through the-position shown in Fig. 3 to that shown in Fig. 4. The men'iber 32 is preferably provided with an upstanding lug 58'whn-h engages the men'iberlti behind the lug 54 as the last moves from the Fig. 3 position to the completely collapsed position shown in Fig. 4. The reaction betweeirthe lugs 58. and 54 throws themember 46 upwardly, as shown in Fig. 4, so'that when the last is brought back .to extended position the member 46, being trictionally held by the ball 50, will not fall back with the lug 56 engaging ehind the lug The last, therefore, when extended will always come to positively locked position.

It is obvious that the duplicated hinge link construction is not material to the presentinvention but it makes the last stronger and better able to resist twisting strains of the leveling operation.

It is now clear thatmynovel last while providing a positive lock and thereby furnishing ideal conditions for machine, shoen'iaking can be unlocked without the use of any special tools or without requiring a collapsed by pressure alone upon any ordim-an d impositive locking positions. a member of and the other into engagement With said abutment and to lock the swinging member in the second position. 14. In a last, separate fore and heel parts, bonding mechanism joining said parts constructed and arranged to permit the collapse of the last, a member on one of said last parts constructed and arranged to engage the other last part in two relations to hold the last rigidly extended or to permit collapse by pressure, respectively, and a member actuatable to change one of said relations to the other at will, and means for moving said second-named member to inoperative position as the last is collapsed.

15. In alast, separate fore and heel parts, bonding mechanism joining said parts constructed and arranged to permit the collapse of the last, a positive locking means, an im-' positive locking means permitting collapse of the last by pressure only, said positive locking means going automatically into operation as the last is extended after collapsing.

g 16. In a last, separate fore and heel parts, bonding mechanism joining said parts constructed and arranged topermit the collapse of the last, a locking member having positive and impositive locking positions, a member accessible to the operator for moving the locking member from positive to impositive locking position to permit collapse of the last by pressure, there being provision for moving said accessible member into inoperative position before the last reaches extended position after collapse. I

17. In a last, separate fore and heel parts,

bonding mechanism joining said parts constructed and arranged to permit the collapse of'the last, a locking member having positive accessible to the operator for moving the locking member from positive to impositive locking position, to permit collapse of the last by pressure, there being provision for moving said accessible member into inoperative position as the last is collapsed.

I 18. Ina last, separate foreand heel parts, bonding mechanism joining said parts-constructed and arranged to permit the collapse of the last, a normally positive lock, and means for rendering said lock impositive at will, said last parts being slightly relatively displaced from extended position When impositively locked.

19. A locking member for a collapsible last having a portion constructed and arranged to engage an abutment in one last part and a portion constructed and arranged to engage an, operating member for moving last collapses.

20. In a last, separate fore and heel parts, a mechanism between said parts comprising bonding members constructed and arranged to permit the collapse of the last, and com prising a locking member arranged to lock the last positively against collapse, the looking member being further arranged to move into operative engagement with an element of the said mechanism upon being displaced from positive locking position, whereby it is held against accidental return to said positive locking position, and to be moved out of operative engagement with the said GEORGE G. SGHELTER.

.60 said member to inoperative position as the

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