US2231918A

US2231918A - Last for attaching heels

Info

Publication number: US2231918A
Application number: US291520A
Authority: US
Inventors: Jacob S Kamborian
Original assignee: General Research Inc
Current assignee: General Research Inc
Priority date: 1939-08-23
Filing date: 1939-08-23
Publication date: 1941-02-18
Anticipated expiration: 1958-02-18

Description

1941- J. s. KAMBORIAN LAST FOR ATTACHING HEELS File d Aug. 23, 1939 7 Weak? W Q2625 a Patented Feb. 18, 1941 UNITED STATES PATENT OFFICE LAST FOR ATTACHING HEELS Application August 23, 1999, Serial No. 291,520

12 Claims. (01. 12-103) This invention pertains to the manufacture of shoes and particularly to a device for temporarily attaching heels to shoes during setting of the cement and insertion of the permanent fastenmgs.

In making womens shoes, the heel is first cemented to the outer surface of the sole and afterward is permanently secured by means of screws or nails which extend downwardly from the in- 10 side of the shoe through the sole and into the heel. Various kinds of clamping devices have been used for holding the heel against the heelseat while the adhesive is setting.

Preparatory to attaching a heel to a womans shoe, it is customary to prepare the heel-seat of the lasted shoe by cutting or otherwise shaping the outsole of the shoe into the desired form and fastening the shaped outsole to the insole by 20 some means such as tacks. After coating the cup surface of the heel, or the heel seat, or both, with adhesive, the heel is then clamped to the heel-seat thus prepared, and by operating through a passage extending from top to bottom through the rear part of the last, a hole is drilled through the heel-seat into the heel clamped thereon. The drill is then removed, and the heel-cup and heel-seat are drawn closely together by inserting a screw through the passage 30 in the last and the drilled hole in the heel and setting the screw by the application of a screw driver or other tool. After the adhesive has set, this clamping screw is removed and the permanent attaching fasteners are inserted.

Certain disadvantages are inherent in such a procedure. The numerous insertions of the drill, followed by the application of the screw to the heel through the passage in the last, result in a breakage of the drill, excessive wear of the screw,

and a reduction in the holding power of the screw, which often results in partial displacement of the heel, the displacement being in a .5 direction away from the breast of the shoe due to the angle at which the heel attaching screw intersects the line of contact of the heel seat of the shoe and the cup of the heel. This procedure has the added disadvantage of involving 50- two distinct operations in attaching the heels, with an undue expenditure of time consumed and resultant high cost of manufacturing the shoes.

The principal object of this invention is to provide means whereby the operation of clamping the heel to the heel seat while the adhesive is'seta gradual enlargement of the passage which causes ting is facilitated and the cost of the operation is reduced.

With this object in view, the invention contemplates the employment of a last having, as a permanent part of its structure, an implement 5 designed first to drill a hole through the heel seat into the heel and then, without removal of the drilling element, firmly to clamp the heel in place. In the embodiment here chosen for illustration, the last is provided, in its heel end portion, with a chamber which normally houses a heel clamping screw, whose tip is shaped to form a drill bit, designed and arranged to enter the heel from the last substantially perpendicularly to the heel plate of the last. Preferably the screw is arranged in the spindle hole of the last, and driven by a screw driving device which operates through the spindle hole, and is entirely withdrawn into the last when not in use as a V heel attaching medium.

A further object of this invention is to provide a device contained within the last by means of which a hole is drilled in a heel and the heel temporarily clamped to a shoe by a heel attaching screw under the impulse of the single application of a rotary motion imparted by a screw driver or other tool.

As a consequence of the novel construction here provided, the permanent heel-attaching screw may be inserted in such a way that the plane of the surface of thehead of the screw will lie in the plane of the insole.

Other objects and advantages of this invention Will be manifested in the following detailed description and by reference to the accompanying drawing, in which:

Figure 1 is a side elevation, partly in section, of a last revealing the heel clamping device constructed in accordance with this invention;

Figure 2 is a side elevation of the combination heel attaching screw and drill bit removed from the last;

Figure 3 is a plan view of the combination heel attaching screw and drill bit;

Figure 4 is a section on 4-4 as shown in Figure 2; and

Figure 5 is a fragmentary side elevation showing the attached heel with the permanent fastening screw in place.

As here illustrated, the invention is shown, by way of example but not by way oflimitation, as embodied in a last of a common type provided with its own clamping means, whereby the heel may be firmly secured to the lasted shoe while the cement is setting.

In the drawing the numeral l indicates a last having a heel plate 2, and having the usual spindle-hole-sleeve of the last replaced by a sleeve 3, which extends through the last from top to bottom substantially perpendicularly to the plane of the heel plate 2. This sleeve 3 is held in position by a transversely extending thrust pin 4 and is internally threaded at 5, the internal threads extending from an internal shoulder 6 of the sleeve 3 to the heel plate 2 of the last I. Within this outer internally screw threaded sleeve 3 is what I prefer to call a thimble unit indicated at 1 in the drawing. The upper part of this unit is hollow, providing the socket 8 which is designed to receive the spindle on which the last is mounted during the performance of various operations in shoe making. The upper part or head of the unit 7 is externally screw threaded at 9 for engagement with the internal screw threads of the sleeve 3. The unit I is also furnished with .an elongate cylindrical stem portion In having a drill bit H at its free end. The exterior surface of this stem 10 is provided with a screw thread l2 between the upper end of the drill bit and the head and has longitudinal grooves l3 extending along the drill bit portion and part of the screw threaded portion. The inner end of the socket 8 is provided with slots I4 for the reception of a screw driver or similar tool.

While the last is being used in ordinary shoe making operations the unit 1 is disposed, as shown in Figure 1, wholly wthdrawn into the rear part of the last. During these operations the socket 8 is available to take the place of the usual last socket. In attaching the heel, the outsole is shaped to form the heel-seat and fastened to the insole in the usual manner, the heel is coated with adhesive and disposed against the heel seat, as indicated in dotted lines in Figure 1 of the drawing, and temporarily held in place, and then by the use of a screw driver or other tool the unit 7 is advanced by turning it relatively to the screw threads 5, thus causing the drill bit I l to enter the heel, the drill bit being directly followed by the screw ID which is slightly larger in diameter than the drill bit and which thus draws the unit 1 down toward the heel, or vice-versa, pulls the heel up toward the heel-seat of the shoe, the unit I eventually holding the heel clamped against the heel seat and transferring the stress caused thereby through the internal threads 5 to the sleeve 3 which is held in position by the thrust pin 4, as illustrated in Figure 1. The heel is thus securely clampedto the lasted shoe while the cement is setting. After the cement has set the unit I may be backed out, the last removed from the shoe, and the heel permanently attached in any usual way, for example, by means of nails driven into the heel through the heel-seat from inside the shoe, or by means of a screw S driven into the hole in the heel made by the heel clamping screw and drill bit, as illustrated in Fig. 5.

It is clear from the foregoing description that I have provided a very simple, efficient, and novel means for clamping heels to lasted shoes so as to preventv displacement of the heel relatively to the lasted shoe durin the setting of the adhesive.

It is also clear that this clamping device is wholly withdrawn into the last when not in use and therefore cannot engage or injure other things with which the last may come into contact.

While certain embodiments of the invention have been disclosed herein by way of example, it is to be understood that the invention is not necessarily limited to the precise construction herein shown and described, but is regarded as inclusive of all proper equivalents thereof and as defined in the appended claims.

I claim:

1. A last having a spindle hole, heel drilling means normally housed within the spindle hole and forming a permanent part of the last, means incombination with the drilling means for temporarily clamping a heel to the last, and means co-operable with the combination drilling means and heel clamping means for advancing the latter into the heel when the drilling and clamping -means is rotated.

2. A last comprising, as a permanent part of its structure, a heel clamping means comprising a clamping screw havin a stem which terminates in a drill bit, and means for advancing the clamping screw into the heel when the clamping screw is rotated.

3. A last having a spindle hole, in which is constructed and arranged an internally screw threaded sleeve, heel drilling and heel clamping means normally housed within the spindle hole and forming a permanent part of the last and having a screw threaded head for engagement with the internally screw threaded sleeve, whereby rotation of the heel drilling and heel clamping means advances the latter into the heel, and a means for permanently fixing the sleeve in the last.

4. A last having a spindle hole, a drill bit normally housed within the spindle hole and forming a permanent part of the last and having a screw threaded shank for clampin a heel to the last, the drill bit having a screw threaded head, and the spindle hole having an internally screw threaded sleeve co-operable with the drill head, whereby rotation of the head advances the drill bit' into the heel, the sleeve being permanently fixed in the last, and a thrust pin to transmit the stresses caused by the drilling and clamping of the heel from the sleeve to the body of the last.

5. A last comprising, as a permanent part of its structure, a heel clamping means comprising a clamping screw, moveable relatively to the last, and which, when disposed in its inoperative position, is wholly within the last, the screw having a stem which terminates in a drill bit, .and means for advancing the clamping screw into the heel when the clamping screw is rotated.

6. A last, having a spindle socket, and comprising, as a permanent part of its structure, a heel clamping means comprising a clamping screw, positioned coaxially with the spindle socket, which is moveable relatively to the last, and which, when disposed in its inoperative position, is wholly within the last, the screw having a stem which terminates in a drill bit of slightly smaller diameter than the minimum external diameter of the screw thread, and means for advancing the clamping screw into the heel when the clamping screw is rotated.

7. A last, having a spindle socket, and comprising, as a permanent part of its structure, a heel clamping means comprising a clamping screw, positioned coaxially with the spindle socket, which is moveable relatively to the last, and which, when disposed in its inoperative position, is wholly housed within the last, the screw being so designed and dimensioned as to provide a spindle socket of normal depth when the screw is disposed in said inoperative position, the screw having a stem which terminates in a drill bit of slightly smaller diameter than the minimum external diameter of the screw thread, and means for advancing the clamping screw into the heel when the clamping screw is rotated.

8. A last, having a spindle socket, and comprising, as a permanent part of its structure, a heel clamping means comprising a clamping screw, positioned coaxially with the spindle socket, which is moveable relatively to the last, and which, when it is disposed in its inoperative position, is wholly concealed within the last, the screw being so designed and dimensioned as to provide a spindle socket of normal depth when the screw is disposed in said inoperative position, the screw having a stem which terminates in a drill bit of slightly smaller diameter than the minimum external diameter of thescrew thread, and having longitudinal grooves extending along the stem, and having a screw threaded head, and a sleeve within the spindle hole of the last having its lower portion internally screw threaded for engagement with the external screw threads on the head of the clamping screw, whereby ro-ta tion of the head advances the clamping screw into the heel.

9. A last comprising, as a permanent part of its structure, a. heel clamping means comprising a heel clamping screw normally housed in a chamber in the rear part of the last and provided with a stem which terminates in a drill bit constructed and arranged to enter a wooden heel by being projected substantially perpendicularly to the heel-plate of the last from said chamber in the rear part of the last, thereby to clamp the heel firmly to the last, and means for guiding and projecting the drill bit.

10. A last comprising, as a permanent part having a passage in its rear part substantially perpendicular to the heel-plate of the last, an internally screw threaded sleeve fixed in said passage, a heel clamping screw having a screw threaded head which engages the sleeve, and having a longitudinally grooved stem portion which terminates in a drill bit, the clamping screw being adapted to enter a heel by being projected axially when the head is rotated in the sleeve.

11. A last, having a spindle socket, and comprising, as a permanent part of its structure, a heel clamping means, the last having fixed therein a sleeve, whose upper part constitutes the upper portion of the spindle socket and whose lower part is internally screw threaded, and which is constructed and arranged substantially perpendicularly to the heel plate of the last and fixed in a passage extending from the top to the bottom in the rear part of the last, and a heel clamping screw, having a stem which terminates in a drill bit and which has longitudinal grooves, and a head which is hollowed to form a spindle seat at the base of the spindle socket and which is externally screw threaded for engagement with the internal screw threads of the spindle sleeve, the heel clamping screw being adapted to enter a heel by being projected from the sleeve into the heel, thereby to clamp the heel firmly to the last, the screw normally being disposed within the body of the last when not in use as a heel clamping medium.

12. A clamping device comprising an internally screw threaded sleeve, and a threaded fastener, which includes an externally threaded head which engages with the internally threaded sleeve, and a threaded stem which terminates in a drill bit of slightly smaller diameter than the minimum external diameter of the screw threads, said fastener being adapted to enter a wooden object and to draw it toward the end of the sleeve.

JACOB S. KAMBORIAN.