US933821A - Last. - Google Patents

Description

- s. s. CAMERON.

LAST.

APPLIUATION FILED NOV. 1' 7, 1906.

933,821, Patented Sept. 14,1909;

Wins'w 3' SIDNEY S. CAMERON, OF DETRCIT, MICHIGAN.

LAST.

Specification of Letters Patent. Patented Sept. 14:, 1909.

Application filed November 17, 1906. Serial No. 343,844.

To all whom it may concern:

Be it known that I, SIDNEY S. CAMERON, a citizen of the United States of America, residing at Detroit, in the county of WVayne and State of Michigan, have invented certain new and useful Improvements in Lasts, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvement in hinged lasts of that kind in which the forepart section and the heel section are hinged together by a lock hinge which holds the sections in their extended position and can be unlocked when desired to withdraw the last from the work. In the prior construction, the lock hinges are composed of associated members and for this reason many misfits result from the use of such hinges on account of the difliculty of accurately securing the hinge members in the sections of the last. Further such lock hinges being more or less bulky and of cast iron much breakage of lasts was incurred either on account of the hinge being weak from cutting away too much of the wood or from the cracking of the cast iron in the heavy operations to which the lasts are subjected. It is also difficult in the use of such lock hinges to change the styles or replace broken lasts without making entire new lasts, while it would effect a considerable saving by replacing only the forepart section which is the one most affected.

My invention is designed to provide a simple and efficient construction in which the hinge connection can be more easily and accurately made and to which the other objections stated do not apply.

To this end the invention embodies the construction of the improved lock hinge as hereinafter more fully described with reference to the accompanying drawings in which Figure 1 is a vertical longitudinal section of my improved last, Fig. 2 is a side elevation thereof, and Fig. 3 is a cross section on line X-X Fig. l.

The last is composed of a fore-part section 1 and a heel section 2 the latter being integrally formed with two forward projecting hinge knuckles 3 which accurately fit into corresponding recesses in the fore-part section and form a continuous abutment therewith on the bottom side of the last.

The two hinge knuckles are separated in the center by a narrow slit 23 which extends rearwardly into the heel section and into this slit engages a hinge plate formed with a corresponding knuckle 4 and having a shank 5 extending into the fore-part section and secured therein by transverse pins 6 and 7. The knuckle of the hinge plate is pivotally connected with the knuckles 3 by a transverse hinge pin 8 which passes through from side to side and is fast in the wood.

The heel section is provided with the usual socket ferrule 9 of uniform diameter for supporting the last upon the jack pin and a coil spring 13 confined between it and the heel plate 14.

It will be noted that the edge of the knuckle plate 4 beyond the shoulder 12 is rounded, and that the portion of the dog 10 in advance of the pivot 11 is correspondingly in-curved along its inner edge. In this way, after disengagement of the dog from the shoulder, the sliding engagement of the knuckle plate with the dog as the last is collapsed will cause practically no further movement of the dog; and for this reason a short spring may be employed. A slot 15 is formed in the wood of the forepart sec tion for the reception of the forward portion of the dog, and this slot is curved to correspond with the curvature of the knuckle plate, thus providing for the proper reception of the dog with a minimum cutting away of the wood.

The heel and fore-part sections being'cut away as usual at one side of the hinge it will be seen that the lastmay be collapsed by engaging it with a jack pin of sufficient length to press the dog out of engagement with the locking shoulder of the hinge. To this end the jack pin upon which the last is secured may be provided with a removable collar adapted to hold it out of contact with the locking dog while the work is carried on.

The importance of causing the pivoted detent to project Within the usual jack-spindle socket of uniform diameter is that, with This dog projects such construction, a special' pin or spindle for unlocking the detent is unnecessary. The same jack-spindle upon which the last has been supported throughout the work will perform the operation by simply removing the collar or similar spacing device whichv has hitherto prevented its contacting with the detent;

With my construction there is but a small amount of wood to cut away to make room for the hinge plate and dog, and the metallic parts are simple and form parts of a strong hinge in which the dog acts as a brace in the support of the fore-part when subjected to pressure. I Since the hingemembers are not composed of parts associated together as a locking hinge independently of the last, the hinge can be fitted to the last more accurately than would be otherwise the case. The abut ting faces between the two sect-ions interlock with each other and hold them in their proper relation and being wholly formed by the wood of the last they can be accurately fitted together before applying the hinge plate. The hinge plate can then be secured in position first in one part and then in the other, the holes for thefastening pins being 7 bored through the wood and the hinge plate at one operation while the last is held in its proper extended position and the dog 1s then secured 1n proper positlon in a slmilar manner. Thus the hinge is completed by a series of simple operations which simplify the construction of such lasts and reduce the number of misfits resulting from the use of lock hinges composed of associated members.

Having thus'fully described my invention 'cut bodily out of said adjacent face of the forepart, the sides of the kerf forming guides bearing against the outer sides of the knuckles, a narrow metal plate embedded in the foresection and extended between the knuckles, a pivot pin passing through the knuckles and plate, the edge of the plate between the knuckles being substantiallyconcentric with the pin except for a shoulder having a radial edge, a jack spindle socket inserted in the rear section in the plane of the plate and provided at its inner end with a deep notch, a dog of thin sheet metal bent in a reverse curve and pivoted between its ends in a narrow slot in the body of the rear section to vibrate in the plane of the plate with its forward end riding on the plate margin between the knuckles and having a squared end adapted to abut the plate shoulder and lock the sections in extended position, and a spring in the socket in compression between the so'cket bottom and the rear end of the dog which extends through the socket notch.

In testimony whereof I aflix my signature in presence of two witnesses.

SIDNEY S. CAMERON. WVitnesses V Lnwis E. Fnanonns, (l'r'ro F. BAR'IHEL.

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