US239958A - Pricking-awl and awl-plate - Google Patents

Description

(No Model.)

G. H. INMAN.

Prioking Aw and-m1 Plate No. 239,958. Patented April 12,1881.

Wang; k fiwentoi 15% M M UNITED STATES PATENT QEFICE.

CHARLES H. INMAN, OF STONEHAM, MASSACHUSETTS.

PRICKING-AWL AND AWL-PLATE.

SPECIFICATION forming part of Letters Patent No. 239,958, dated April 12 1881.

Application filed September 6, '1880. (No model.)

lowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification...

This invention relates to the construction of awls employed in machines for pricking the heels of boots and shoes preparatory to the driving of the nails therein, these prickingawls, so-called, being erected upon a plate by inserting their lower ends in holes in the latter from its under side, the outer lift or tread of the heel being pressed down upon the combined points of the awls from above.

Heretofore these awls have been composed of one piece of steel with a tapering or frustoconical head, as shown in Figure 3 of the drawings, while the holes in the plate, when the latter is new, are slightly tapering and of a diameter less than that of the awls head the head of the awl beingdriven into the hole, in order to insure a close fit, for the purpose not only of confining the awl rigidly erect in place within the plate,but also to prevent the turning of the awl in the hole, as it is important that the original position of the point of the awl shall be preserved, owing to the fact of its being flat. As these awls are frequently broken or injured and require renewal, the holes in the plate become enlarged and do not firmly gripe the awl-head, and in consequence the plate must be discarded.

The purpose of my invention is to provide an awl which shall not interfere with the original size of the hole or injure the plate, and which cannot becomeloose or turn in the hole, and to this end I form the head of the awl of a material softer than that of the plate,-so that repeated removals and insertions of an awl shall not enlarge or injure the hole.

An incidental feature in my invention consists in creating in the walls of each hole in the plate longitudinal or spiral parallel grooves, into which the soft material of the headof the awl is crowded, thereby preventing possibility of turning of the awl in its seat.

The drawings accompanying this specification represent, in Fig. l, a sectional elevation of an awl containing my improvement, and in Fig. 2 a section of the awl as applied to the plate which supports it. Fig. 3 in said draw-- 6o ings represents an elevation of an awl heretofore in use, and Fig. 4 a section of the plate containing it. Figs. 5 and 6 are a horizontal sect-ion of the plate and two of its holes, showing the ribs and grooves, as hereinafter alluded to.

In these drawings, A represents the awlholding plate of a heel-pricking machine, the same being punctured with a series of vertical holes, a a, &c., arranged in the form of the tread of a boot-heel, as usual in such machines, these holes, when originally drilled, being slightly tapering and increasing in diameter toward their lower ends.

B in the drawings represents an awl as here- 7 5 tofore made, it being composed of hardened steel and having an integral frusto-conical head, 0, of a diameter greater than that of a hole, a, and when the awl is inserted in the plate it is diiven into the hole with considerable force, in order, as before stated, to confine. it securely therein, the result being that after several insertions the hole becomes enlarged to such an extent that the plate is useless.

In carrying out my invention I provide the awl B with a head, D, of a metal considerably softer than that of the plate A, in order that when the head is inserted in one of the holes a and driven tightly therein it shall not enlarge or otherwise injure such hole.

The head D may be screwed upon the end of the awl, as shown in Fig. 1 of the drawings, or it may be brazed or riveted thereto, or shrunken upon it. I do not restrict myself to the precise manner of securing the head D to the body 9 5 of the awl, as it may be effected in various ways.

To prevent possibility of turning of the awl in the hole I prefer to create in the walls of such hole one or more longitudinal or spiral 10o grooves, 11, into which the soft metal of the head of the awl is crowded as the latter is and a head of softer metal, screwed upon or otherwise attached thereto, substantially as set forth.

2. In combination with a perforated awl plate, a series of awls having heads which are softer than said plate, said heads beingscrewed upon or otherwise attached to the shanks of the awls.

3. An awl-plate having holes and provided 20 with grooves or ridges in the walls of said holes, in combination with awls having heads of metal softer than said plate.

In testimony whereof I affix my signature in presence of two Witnesses.

CHARLES H. INMAN.

Witnesses: WM. T. ANDREWS,

H. E. LODGE.

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