US223767A - Gunpowder punching-machine - Google Patents

Description

T. SHAW. Gun-Powder Punching-Machine.

Patented Jan. 20, 1880 k: n

WITNESSES: INVENTOR W: Gum/ML ATTORNEY I UNITED STATES PATENT OFFICE.

THOMAS SHAW, OF PHILADELPHIA, PENNSYLVANIA.

GUNPOWDER PUNCHING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 223,767, dated January 20, 1880.

Application filed November 23, 1878.

' To all whom z't may concern Be it known that I, THOMAS SHAW, of the city and county of Philadelphia, Pennsylvania, have invented a new and Improved Gunpowder Punching-Machine and Ihereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, -and to the letters of reference marked thereon.

My invention consists in the production of a machine actuated by explosive compounds in a confined chamber, that forcibly ejects a piston or plunger, to which is secured the desired punch or other tool that is to out, impress, or shear metal or other material requiring great force to act upon the same, the prin= cipal features of which are constructed and operated in the manner and for the purpose as hereinafter described.

The object of the invention is to furnish a compact powerful machine to perform the maximum labor, limited in its giant strength only by the strength of the material of which it is composed.

In order to enable others to use and practice my invention, I will proceed to describe its construction and operation.

On reference to the accompanying drawings, which form part of the specification, Figure l is a vertical section through the center of the machine, and Fig. 2 is a cross-section on the line 1 and 2 5 and Fig. 3 is a top view of the same.

Similar letters refer to similar parts, of whichA is the cylinder or body of the machine, bored in the center forthe reception of plunger B, die E, and thrust-ring F, and has a cross-aperture, K, for the insertion of bars of metal to be acted upon. H isthe explosionchamber, provided with an aperture on the top for the insertion of explosive compounds, which aperture is closed by plug 0, which plug has a central bore throughout its entire length for the insertion of the firing-pin I, which projects above the plug 0 at the top, and is provided with an enlarged head at the bottom, to prevent blowing the pin out of the plug. There is a slight concavity in the top of plunger B, in which the explosive powder falls, and on which the pin I rests preparatory to discharging the compound. The plunger B has a throughbolt, L, that projects beyond both sides of cylinder A, which cylinder is slotted for its reception and operation. The outer ends of said bolt L are grasped by strong springs D, the upper ends of said springs being secured by bolts G to the outside of cylinder A, and the tension of the springs is to close plunger 13 back into the cylinder from which it is expelled by the explosive force.

The plunger B, Fig. 2, is provided with channel-ways N, to exhaust the pressure after the plunger'B has traveled the length of the explosion-chamber H.

J shows a punch secured to plunger B in any of the ordinary methods of securing punches to punching-machines. over the die E, for the reception of the same, and any forcible downward movement of plunger B will punch from any bar or plate a hole of the configuration of said punch. The punch can be variously fashioned, and shear-blades or other metal-working devices can be secured to said plunger B, and other dies substituted in place of the one shown at E by any of the common methods of securing said dies or other metal-working devices, all of which can be forcibly operated by said plunger B, as hereinafter explained.

O is a cushion of elastic material, to overcome the final momentum of plunger B after the necessary stroke is terminated. The plug 0 is held in place byscrew-thread on the entire or part of its length, or can be held by ordinary cam-grooves.

The machine is operated in this manner: The screw-plug O is removed, and a small portion of percussion material or powder is inserted or allowed to drop upon the top of plunger-head B in the explosion-chamber H; When the plug (3 is inserted or placed in a resisting position to prevent its being blown out, the material to be operated upon is inserted beneath the punch J of plunger B. The pin I is struck with a hammer or other object on the top at I, which causes the percussion material to ignite and create a great pressure in chamber H, which forcibly ejects plunger B and resists obstructions beneath the same, cutting or squeezing material according to the shape and fashion of the dies employed. This force continues until the gas exhausts itself from the The punch J is located channels N, Fig. 2, on the completion of the stroke of chamber H, when a similar charge of percussion material is inserted and a like operation performed, as afore describech'the springs D insuring a return stroke.

The machine is intended for such laborious duty that each blow will have sufficient telling eifect as to warrant its employment on several kinds of metal-work.

It will be evident that this machine can be variously modified and fashioned without any alterations in the result. I therefore do not wish to confine myself to the exactmachine set forth.

What I claim, and desire to secure by Letters Patent, is-

1. The combination of the hollow cylinder -A, the die E, plunger B, and the elastic cushion O, as and for the purpose specified.

3. The combination of the hollow cylinder A, the plunger B, with its explosion-chamber H, the plug 0, and pin I, as and for the purpose set forth.

THOMAS SHAW.

Witnesses: v

ELIAS J. SHAW, -WM. GARWOOD.

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