US295397A - Blacksmith s punch - Google Patents

Description

(No Model.) 2 Sheets-Sheet 1. W. P. HOLMAN.

BLAGIQSMITHS PUNUEL.

N0. 295,397. Patented Mar. 18, 1884.

2 sheets -sheet 2.

N A M L O H R W Y BLACKSMITHS PUNCH.

- Patented Mar. 18

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llnrrsn Secures r e'rnwr @rrrcno WILLlAlVI P. HOLMAN, OF HOWARD, GEORGIA.

BLACKSMITHS PUNCH.

SR'EGIFICATION forming part of Letters Patent No. 295,397, dated March 18, 1884. duplication filed July 2, 71883. (No model.)

To all whom it may concern.-

Be it known that \VILLIAM PATRICK Hon MAN, a citizen of the United States, residing at Howard, in the county of Taylor and State 50f Georgia, have invented a new and useful Improvement in Blacksmiths Punches, of which the following is a specification.

The-implement is designed for hand use with an anvil and hammer for punching holes of circular or square form in metal. It is to supersede the drill for general work; and its construction is such as to prevent the swelling or bursting of the metal in driving thepunchpin through it, and thereby permit holes to I be punched quite closetogether and quite close to the edge of the metal, which cannot be done with the ordinary punch, especially in castiron. The punch-pin tapers upward from its cutting end, and is carried in a clampingsocket formed upon the end of a springarm, which is preferably integral with a base-arm adapted to receive a die upon which the metal is placed, so that the punch-pin is driven first through the metal and then drops through the die and an opening in the base-arm with the punched-out plug. The opening in the die dares to its bottom and opens into the opening in the base-arm, so that the punched-out plug and the tapered punch-pin will fall freely through the die. It is the taper form of the driven pin or punch, in connection withsupporting the plate or bar to be punched upon the face of a die having a downward-flaring through-opening a little larger than the cut ting end of the tapering punch-pin, which prevents the bursting of the metal and gives a clean cut. The clampingsocketis intended only to hold the tapering pin in position to allow it to be driven down through said socket and through and free of the die, and to allow said pin to be adjusted to suit the thickness of the metal to be punched, so that the cutting end of the punch-pin will be held upon the metal to receive the first blow, and will follow, down until it is driven through the clampingsocket and falls clear of the base-arm. The driven pin is readjusted in theholding-arm by passing its small end first up through the flaring opening in the die from the bottom of the 5 basearni.

Referring to the accompanying drawings,

Figure 1 represents the punching implement in perspective; Fig. 2, a vertical sectional elevation, showing the plate in position to be punched; Fig. 3, a similar view, showing the driven punch falling through the die, with the plug out from the plate. Figs. 4 and 5 are tapering punch-pins of cylindrical. and square form. Figs. 6 and 7 are dies of corresponding form; and Fig. 8 shows a plate with holes punched close together without bursting.

The implement is preferably forged from a bar of steel with a flat base, a, formed at one end with an upturned fiat spring, b, which terminates in a rigid arm, 0, overhanging the flat base, and carries at its free end the tapering pin or driven punch d, in a vertical position within a clamping-socket. The other end of the fiat base has an op ening, e, and is formed on its upper surface with a recessed seat, 6/, adapted to receive and hold a die, f, having an opening corresponding in form but a little larger than the cutting or largest end of the tapering driven pin, and opening into thesaid base-opening. v f

The taperingpin punch cl may be of oylin- I drical or square form, but tapers upward from its cutting end, so thatin being driven through the metal it will make a clean cut, by means of being practically free from the walls of the opening being punched, and thereby prevent binding within the punched hole. The face of the die is flush with the upper surface of the basearm and the opening in the die flares downward, and opens into the base-opening e, "8 5 so as to allow the punch pin to be driven through the die with the punched-out plug without binding. This provision of separate, dies adapts the implement for use with diffen ent'shaped punch-pins; but I may dispense 9 with the separate dies, and form the daring die-opening in the base itself.

The arm for carrying the punch-pin is split vertically at its free end to form a spring socket or clasp, it, within which the tapering 9 5 punch-pin is clamped in by means of a yoke, t, driven over the slit arm toward the socket, so as to bind its socket end hard upon the upper or tapered end of the punch-pin, which projects above the arm to receive the blows of the loo hammer. The punch-pin is 'set so as to bear upon the article to be punched, and the spring of its carrying-arm allows it to descend as the hole is punched.

The fiat base and punch-pin-carrying arm are of suitable length, and the spring is formed by a flattened, bent, or curved part.

Any suitable power may be applied for driving the punch-pin, and the latter may be secured in any suitable manner to its carryingarm; but the clamping-socket shown is preferred, because it allows the clamp to be opened to receive the punch-pin and easily bound upon and released from it.

In using the implement, the die and punchpin to suit the desired form of hole are secured in place, and the punch-pin adjusted to the thickness of the metal, the implement be ing held by the left hand, with its flat base upon the anvil. The plate to be punched is then held upon the die by the right hand, and the punch'pin driven by an assistant workman, using a hammer. Care should be taken to raise the punch-pin-carrying arm in placing the plate upon the die, so as not to strike against the end of the punchpin, which might place it out of proper vertical adjustment; but if properly set in the claniping'socket the punch-pin will not touch the die in passing through it.

The provision described, broadly considered, for adapting the punch-pin to following and be discharged with the punchingthrough the die and through a base-opening eorresponding with the die is not claimed herein, as it is not new; nor is it intended to claim,

broadly, a spring-sustained punch; but my invention consists of the specific implement herein described, having a punch-pin tapering from its cutting to its driving end, held upon the plate to be punched by the positive action of its spring-carrying arm, from the clasping end of'which it is driven, and operating with a die having a downward flaring opening, whereby 15b prevent the binding of the punchpin in the metal, and swelling and bursting of the metal in driving the punch through it, and especially in punching plates near their edges. In the use of the tapered punch carried .b an overhan in s JIlD clam )ing-arm the 1"! it! b c 7 punch-pin is adjusted in its clamp upward through the base-opening in the die, and is set to bear upon the plate, which is placed upon the die after the punch-pin is so set. This positive holding of the punch-pin upon the plate is important in giving a true startingcut and holding the punch-pin firmly upon the plate.

I claim 1. The Within-described punching implement, consisting of a punch-pin, d, tapering from its cutting to its driving end, a springarm, 0, having a clamping-socket, a base-arm, a, joined to said spring-arm, and a die, f, having a downward-fiaring opening, the said punch pin being clamped directly by the spring-arm and held upon the plate to be punched by the positive action of said springarm, substantially as set forth.

2. The punch-pin d, tapering from its cutting to its driving end, in combination with a clamping-arm, c, therefor, a die, f, having a downward-flaring opening, and a base-arm, a,

W. l HOLMAN. I

Witnesses:

D. A. CASTLEBERRY, J. B. FOWLER.

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