US2176228A - Chisel - Google Patents

Description

N. A. SHERIDAN CHISEL Oct. 17, 19 39,

Filed March '7, 1939 I INVENT OR.

Z ATTORNEYS Patented Oct. 17, 1939 UNITED STATES PATENT OFFICE CHISEL Nicholas A. Sheridan, Flushing, N. Y. Application March '1, 1939, Serial No. 266,286

My invention relates to a new and improved combination chisel and guard.

One of the objects of my invention is to provide a device in which a suitable guard is connected movably to a chisel, so as to provide a combination tool, thus making it unnecessary to apply the guard to the chisel when it is desired to use the chisel.

Another object of the invention is to provide a combination tool and guard which will be particularly useful in transversely cutting round pipe and the like.

Another object of the invention is to provide a guard which is connected movably to a chisel so as to facilitate the transverse cutting of round pipe.

Other objects of my invention will be set forth in the following description and drawing which illustrate a preferred embodiment thereof, it

if) being understood that the above statement of the objects of my invention'is intended generally to explain the same without limiting it in any manner.

Fig. 1 is a side elevation of the improved tool, part of the representation of the guard being broken away so as to illustrate the guard more clearly. In this figure the full-line position of the guard shows the operative position thereof and the broken-line position of the guard shows the so inoperative position thereof.

Fig. 2 is a sectional view on the line 2-2 of Fig. 1.

Fig. 3 is a bottom plan view of Fig. 1.

a Fig. 4 is aside elevation of the guard, taken at the right-hand side of Fig. 1. I

The device includes a chisel l which is suitably connected to a handle 2. The chisel I has the I usual cutting edge 3. As shown in Fig. 2, the

chisel I is provided with a lateral bore 4. The

shield or guard 5 is made of any suitable metal.

It is provided with lugs 6 having slots or perforations 1. A pivot pin 8 extends through the perforations I and the bore 4. The pivot pin 8 is provided at one side thereof with a head whose diameter exceeds the width of the adjacent slot I. The other end of the pivot pin 8 is provided with a cotter-pin 9 or other suitable device for maintaining the assembly between the parts.

As shown in Fig. l, the slots I are of general 5 rectangular shape. The height of each slot 1 is greater than the width thereof. The lugs 6 extend above the front or left-hand wall of the guard 5, referring to Fig. 1. The rear or righthand side of the guard 5, referring to Fig. 1 does 55 not have a lateral wall. when the shield is in the full-line position shown in Fig. 1, there ,is a clearance between the left-hand wall of the chisel and the adjacent edge of the left-hand wall of the guard 5. The guard 5 can therefore be turned to the broken-line position shown in Fig. I' 1. The guard can also have a limited up-anddown movement relative to the chisel, since the 5:11:15 of the pivot pin 8 is easily movable in the s o a In using the device, the bottom edge-walls of 'U the guard are placed upon the surface of the pipe which is to be cut. One man holds the handle 2 and another man strikes the head of the chisel with a hammer. The chisel I and its pivot pin 8 can then move downwardly relative to the ll guard so as to cut the pipe under the blows of the hammer. In cutting cast-iron pipe, chips of the metal of the pipe are frequently thrown with tremendous force under the blow of the chisel and these flying chips have frequently caused very Q serious accidents. The improved device prevents this. Likewise the guard is freely movable and rotatably adjustable relative to the chisel. Hence the guard can readily adjust itself to the curvature of the "pipe, even though its bottom edgeu walls are planar. Since the guard is assembled with the chisel, it is impossible for a negligent workman to use the chisel without the guard.

The device can be manufactured very simply and it can be manufactured at very low cost and so the .use thereof will result in a great reduction in serious accidents.

When the guard hangs, freely from the chisel, the bottom edge-walls of the guard are located below the cutting edge of the chisel. The upper 35 edge of the left-hand wall of the guard then abuts the left-hand wall of the chisel so that the longitudinal axes of the slots 1 are then substantially vertical. The pivot pin I may be turnable relative to the chisel t. o

The width of the tapered portion of the chisel is preferably less than the distance between the inner surfaces'of the opposed side walls of the guard, so that the guard can be shifted sideways relative to the chisel. u

The invention can be applied to any type of chisel, including the diamond point chisel.

I have shown a preferred embodiment of my invention, but it is clear that numerous changes and omissions can be made therein without departing from its spirit.

I claim:

1. A chisel having a cuttingv edge and a pin extending transversely through said chisel and perpendicular to said cutting edge, a guard having 5 slotted portions, said pin extending through said slotted portions and holding the guard movably assembled with the chisel, said guard being pivwalls and a front wall, said guard being open at I its rear end, said guard having lugsextending above the front wall thereof, said lugs having vertical slots, said slots being dimensioned so that the guard can be moved up-and-down and also turned relative to the cutting edge of the chisel, said pin supporting the guard pivotally relative to the chisel, so that the guard can be i turned relative to the-chisel about the axis of the pin.

3. In combination with a chisel having a cutting edge, a guard, pivot means connecting said guard turnably to said chisel, the axis of said pivot means being transverse to said cutting edge, the guard and the chisel being also movable relative to each other up and down relative to said cutting edge.

NICHOLAS A. SHERIDAN.

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