US331414A - Shoe-maker s jack - Google Patents

Description

(No Model.)

J. B. LITGHMAN.

SHOE MAKERS JACK.

N. Pannes4 Pnamumnmpher. wmhingwn, D. c.

UNITED STATES PATENT QEEICE.

JOHN B. LITCHMAN, OF MARBLEHEAD, MASSACHUSETTS.

SHOE-MAKERS JACK.

:l-ECIFICATION forming part of Letters Patent No. 331,414, dated December 1, 1885.

Application filed June 26, 18H5. Serial No. 169,817. (No model.)

To all whom it may concern.-

Beit known that I, JOHN B. Li'rcHMAN, of Marblehead, in the county of Essex and State of Massach usetts, a citizen of the United States, have invented a new and useful Improvement in Shoe-Makers7 Jacks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in explaining its nature.

This improvement relates to the way of constructing and mounting a jack, and also to the way of fastening a last to the jack, and it produces a jack which is adjustable in any direction, has a straight instead of a curved shank, as is usual with jacks, and from its construction it can be used either as a right or left hand jack.

The method of locking the last upon the jack also presents some advantages.

In the drawings, Figurel is an elevation of the jack, showing its connection with a bench, and in the same figure the dotted line shows the position of the same jack connected with a table on the left-hand side of the drawing, instead of the right-hand side, as shown by the full line, and illustrates what is meant by the phrase "right-hand7 and left-hand77 jack. Fig. 2 shows the vertical joint of the Ajack in section. Fig. 4 is a slightly varied form of the vertical joint. Fig. 3 is a form of the vertical joint which has some disadvantages which the form shown in Figs. 2 and 4 are intended to obviate. Fig. Gis a view of amodied form of a part or plate, hereinafter referred to. Fig. 5 is a plan view of the last.

A is the bench. An arm, B, is attached to this bench in any proper position, and on this arm is iXed an ear, b, between which ear b and the arm B is made the vertical joint by which the shank of the jack is adjusted at any desired angle with the arm B. The socket C has on one side two ears, c c, through which the shank D of the jack is passed, and on the other side of the socket C is another ear, c', which makes, with the arm B and its ear b, a vertical joint, around the horizontal pivot of which the jack may be moved into any angle with the horizon lying in the same vertical plane. The shank D of the jack is made with a shoulder, d, that rests upon one of the ears c, and when it is desired that the jack shall be a left-hand .instead of a right-hand jack the collar d, which is at the lower termination of the shank, may be taken off and the jack reversed, as shown in dotted lines in Fig. 1, or by removing plate C and rcversingit. On the upper part of the shank D is a pintle, E, which enters a hole 1n the body of the last. Toward the heel of the last F, in the upper part of it, is made a square hole or niortise, f, which is covered'by a metallic plate, g. To an ear, h, on one side of the shank D is hinged a spring-latch, i t', which is formed at its end to lock behind the plate g, and so fasten down the last upon the 'ack.

J If the vertical joint of this jack were made in the wayin which it is usual to make clampjoints, as shown in Fig. 3, the tightness ofthe joint would depend upon the spring that can be given to the arm B or ear b, or both; but

my improvement consists in forming in the ear b a cavity for the passage of the bolt 7c considerably larger than the size of the bolt, and inserting in this cavity a ferrule or sleeve, m, which may be rigid, as shown in Fig. 4, or a spring, as shown in Fig. 2, by which the pressure of the nut l, when it is turned up, is brought to bear, not against the ear b to spring it sidewise, and so clamp it upon the ear c but against the ear c itself, and so clamp it directly against the arm B.

The drawings show the washer b interposed between the ear c and the arm B; but this is not a matter of absolute necessity. If a spring is used instead of a ferrule, as in Fig. 4, it is desirable to haveawasher, Z', Fig. 2, between the nut Zand the spring.

It will be observed that with this form of jack no toe supportis needed, and that therefore the breaking of the upper across the vamp is prevented. It will also be observed that on account of the peculiar construction of the jack there is no liability of breaking the quarter as it is drawn over the last between the under surface of the last and the upper surface of the jack-support.

I would say that the last may be iniade of cast-iron instead of wood, in which case the recess or hole f and its covering-plate willbe formed in casting.

The socket or socket-plate C, instead of be- IOO ing made and shaped as shown in Fig. 1, may be shaped to bring the upper ear, c, below the hole in the ear c', through which the bolt or pivot connecting it with the arm or support B extends; and on some accounts I prefer this construction, as it brings both bearings of the shank D below the center or pivot k, and I am thereby enabled to more firmly and. securely hold the jack in avertical position. When this form of socketpieceis used, it will be observed that the last, when the shank D is turned horizontally, will be brought into substantially the same position or plane that it occupies when in a vertical position, which I consider to be a material advantage. It also enables me to make the device more compact and to operate it in less space.

It will be seen that the last used with theV jack is of peculiar construction, and that it has one hole for the reception of the pintle or spindle which is like the hole with which lasts are generally provided, with the exception that it is a little farther forward and, in addition to this hole, that it has a locking hole or recess which is adapted to receive the end of the latch or lock in such a manner as to enable the same to hold the last fastened down upon the pin; consequently the recess or space must be under cut and must be covered with a plate. If the last is of cast metal, then the recess can be of proper shape and can be formed in easting; but if made of wood, it will be necessary to form therein holes, substantially as shown in Fig. 1, and to cover the same with a metal plate, g, having holes shaped substantially as represented in plan in Fig. 5.

The state of the art prior to this invention may be understood by patents to Mawhinney, of November 15, 1881, No. 249,651, and to Plummer, April 6, 1869, No. 88,735.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States- 1. 'Ihe combination of the arm B, provided with an ear, b, with the shank of a jack, D, adapted to pass through the socket-piece C, having the ears c c,substantially as described.

2. In an adjustable shoe-makers jack, the clamp-joint composed ofthe members B, b,and c, combined together by means of the nut and bolt 7c Z and sleeve m, substantially as described. p

3. The combination, with the shank D of a jack, of the pintle E and spring-latch z' t", for the purpose of locking the last to the jack,sub stantially as and for the purposes described.

4. In combination with the latch attachment of a pegging-jack, a last having a hole for the pintle, and alocking-recess behind the same of the character described, substantially as and for the purposes set forth.

5. -In combination with the latch attachment of a pegging-jack, the last provided with a metal plate, g, having holes formed therein, as described, all substantially as and 6 for the purposes set forth.

JOHN B. LITCHMAN.

Vitnesses:

JOHN DENNIS, F. F. RAYMOND, 2d.

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