US2113802A - Shoe shank cementing press - Google Patents

Description

.April l2, 1938. H. vALDlsERRi I 2,113,802

SHOE SHANK CEMENTING PRESS Filed March 22, 1937 Patented Apr. 12,'.1938

UNITED s'mfriask PATENT OFFICE 8 Claims.

This invention relates to a shoe shank cementing press, for cementing the shank portions of half soles to the insteps of shoes.

m The principal object of the invention is to provide a simple, highly ecient device which can be quickly adapted for use upon shoes of any style or size, and which will eiectively clamp the shank portion of a sole to the instep while Y the cement thereon is setting, so as to firmly and securely attach th-e sole at the shank as a preliminary to stitching.

Other objects of the invention are: to provide a last which will automatically expand to accommodate itself to shoes of various sizes; to provide l5 a clamp which can be set at any position throughout the length of a shoe to clamp any portion of the sole for any purpose; to provide an electrilcally heated clamp which can be used for vulcanizing or setting the cement; to provide a clamp which can be quickly and easily attached or removed from the last; to provide a clamp which will actuate pins for securing the sole to the instep so that it cannot slip in the cement thereon while the clamp is being tightened.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efliciency. These will become more apparent from the following description.

In the following detailed description of the-invention reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawingzy Fig. 1 is a side elevation of the improved shoe shank cementing press.

Fig. 2 is a horizontal section therethrough, taken on the line 2 2, Fig. l.

Fig. 3 is a cross section, taken on the line 3 3, Fig. 1.

Fig. 4 is a detail longitudinal section through the heating element.

Fig. 5 is a cross section through the heating element.

Fig. 6 is a detail section through the press member, taken on the line 6 6, Fig. 2.

Fig. 7 is a bottom View, looking upward, of the clamping member.

Fig. 8 is a detail side view of the clamping member illustrating the exing action of the bottom.

A typical last post is indicated at I0. The invention comprises an expansion last consisting of a heel portion I I and a toe portion I2. The toe portion is supported from the heel portion upon a central guide rod I3 and two spring tubes III, all of which slide in respective bearings in the heel portion II.

In each of the spring tubes I4 is a compression spring I5. These springs constantly urge the 5 toe portion forwardly away from the heel portion. The maximum extension is limited by means of a head I I on the rear extremity of the guide rod I3.

The heel portion of course has the usual socket m for the reception of the last post.

The clamping portion of the device comprises an L-shaped yoke member I6 having a depending leg I8. At the opposite side of the yoke member a similar leg I9 is hinged upon a suitable hinge bolt 20. The leg members I3 and I9 are notched adjacent their lower extremities to engage a bail member 2|.

The bail member 2| consists of a relatively stiff metallic rod, the extremities of which are passed into the opposite extremities of a bearing sleeve 22 in the heel portion of the last. The sides of the bail extend along each side of the last, and are prevented from swinging upwardly by means of a pressure bar 23 which vextends from side to side beneath the toe portion I2. The member 23 can be slid along the bail so that it may be positioned at any desired point thereon. The upper face of the pressure bar 23 is provided with suitable padding 24 and the `entire bar is covered by means of a suitable soft cover such as kid.

A threaded clamp shaft 26 is threaded downwardly through the yoke I6. The upper extremity of the shaft 25 forms a hand crank 2l. The lower extremity of the shaft supports a clamp box 28v having slotted ears .29 which guide it upwardly o and downwardly along the legs I8 and I9. The box 28 is suspended from a flange 30 on the bottom of the shaft 25, and is formed with an open bottom.

A heating element housing 3i is positioned in the housing 28 and secured therein by 'means of a suitable set screw 32. The remainder of the housing is packed with suitable heat insulation such as asbestos 33.

'I'he bottom of the housing is closed by means of a iiexble metal plate 34 which is covered by a relatively thick rubber pad 35. A pair of sharpened pins 36 extend downward from the plate 34 through the pad 35.

The plate 34 is secured to the housing 3| only at its middle, by means of suitable attachment screws 31, so that the ends of the'plate may be flexed downwardly by means of pivoted blocks 4I when it is desir-ed to exert pressure against a curved sole. An electrical heating element 38 is CIL contained within the element housing 3l and supplied with current through suitable conductors 39 from any convenient attachment plug 40.

Operation Normally the clamp yoke I6 and all of its appurtenancesv are removed from the last, and the bail 2l is swung downwardly. The toe of the shoe is slipped over the toe portion I2 and the latter is pressed rearwardly toward the heel portion I I compressing the springs I5. The heel of the shoe is then slipped over the heel portion II, thus holding the springs under compression. The bail 2I is now lifted and the pressure bar 23 is adjusted to come under the toe portion I2, as shown in Fig. l.

The xed leg I8 is now engaged with one side of the bail and swung over the shoe. The other leg I9 is then engaged with the other side of the bail, as shown in Fig. 3. The half sole with its cement in place is positioned in its proper position, and the crank 21 is rotated to bring the clamp box downwardly against the sole. The upward pull of the clamp upon the bail is absorbed by the pressure of the member 23 against the shoe. The points 36 rst enter the sole so that it can not move relative to the clamp. When the sole is brought to accurate position further tightening of the clamp will cause these points to pierce the instep so that the sole is firmly locked in place.

The clamp is now given the final tightening to clamp the sole firmly to the instep throughout its entire width so that the cement will be spread over the gripping surface. Heat is now applied through the heating element to heat and dry the cement.

After the cement is dried, the screw shaft 26 is loosened, the leg I9 is unhooked from the bail, and the clamp removed. The bail is now swung downwardly, the toe portion I2 pressed inwardly, and the shoe removed with the sole cemented in place thereon, ready for stitching.

While a specic form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.

Having thus described the invention, what is claimed and desired secured by Letters Patent isz-- 1. A shoe shank press comprising: a last; a bail pivoted to said last and extending along each side thereof; a crossmember extendingbetweenthe opposite sides of said bail beneath said last to prevent upward movement of said bail; a clamping yoke extending from opposite sides of said bail over said last, said clamping member, and said cross member being slidably mounted on said bail so that they may be moved to any desired position therealong.

2. A shoe shank press comprising: a last; a bail pivoted to said last and extending along each side thereof; a cross member extending between the opposite sides of said bail beneath said last to prevent upward movement of said bail; a clamping yoke extending from opposite sides of said bail over said last; a pressure plate in said clamping member; a threaded shaft for forcing said pressure plate downwardly toward said last; and an electrical heating element adjacent said pressure plate.

3. A shoe shank press comprising: a last; a ball pivoted to said last and extending along each side thereof; a cross member extending between the opposite sides of said bail beneath said last to prevent upward movement of said bail; a clamping yoke extending from opposite sides of said bail over said last; a hollow clamp box slidable in said yoke; an electrical heating element mounted within said box; and means for forcing said box downward against said last.

4. A shoe shank press comprising: a last; a bail pivoted to said last and extending along each side thereof; a cross member extending between the opposite sides of said bail beneath said last to prevent upward movement of said bail; a clamping yoke extending from opposite sides of said bail over said last; a hollow clamp box slidable in said yoke; an electrical heating element mounted within said box; means for forcing said box downward against said last; a exible bottom plate on said box; and means for flexing said bottom plate to impart a curvature thereto.

5. A shoe shank press comprising: a last; a bail pivoted to said last and extending along each side thereof; a cross member extending between the opposite sides of said bail beneath said last to prevent upward movement of said bail; a clamping yoke extending from opposite sides of said bail over said last; a hollowV clamp box slidable in said yoke; an electrical heating element mounted within said box; means for forcing said box downward against said last; and sharpened pins projecting downwardly from said box.

6. A shoe shank press comprising: a last; a bail pivoted to said last and extending along each side thereof; a cross member extending between the opposite sides of said bail beneath said last to prevent upward movement of said bail; a clamping yoke extending from opposite sides of said bail over said last; and a hinged leg on said yoke which may be swung to and 'from engagement with said bail.

7. A shoe shank press comprising: a last; horizontal members pivoted to and extending along each side of said last; a clamping yoke extending from said members over said last; a pressure plate in said clamping yoke; an electrical heating element for heating said plate; and means in said yoke for forcing said plate toward said last.

8. A shoe shank press comprising: a last; hori- Zontal members pivoted to and extending along each side of said last; a clamping yoke extending from said members over said last; a pressure plate in said clamping yoke; an electrical heating element for heating said plate; means in said yoke for forcing said plate toward said last; and means for flexing said plate to impart a desired curvature thereto.

HERMAN VALDISERRI.

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