US1598650A - Shank and bit punch - Google Patents

Description

Sept. 7', 1926, 1,598,650

H. LEVINE 'SHANK AND BIT PUNCH Filed Dec; 17 1925 3 I INVENTORZ;

Patented Sept. 7, 1926.

umrsn srares Hyman LEVINE, or DENVER, cotonAno, nssienon To rivenasonL-eann coMrAnY,

OLE JERSEY. CIT-Y, NEW; JERSEY, A ,COREORATION 01 iv NEW/JERSEY.

SHANK Ann err PUNCH.

Application filed December This invention relates to shank and bit punches for opening thebores of rock drills but more particularly to that type of machine in which the punch pin is both hammered into and out of the drill steel. Punches of this type generally constitute part of rock drill sharpener outfits in mines, quarries. etc, and in common with the drill sharpeners are subjected to the maximum of hard'usage, often with the minimum of attention. Consequently, just as in the case of the rock drill sharpener, two of the most important features in the design of a shank and bit punch must necessarily be simplicity and ruggedness. The object of my in vention, therefore, is to provide a punch having a minimum of parts while at the same time it loses nothing in effectiveness.

The invention is shown in one of its pre ferred embodiments in the accompanying dra ing, in which Figure 1 is a longitudinal sectional elevation of the machine with the parts in po'-- sition for hammering the punch pin into the drill steel, and I Figure 2 is also a longitudinal sectional elevation of the machine with the parts in position for hammering the punch pin out of the drill steel.

Referring to the drawings, the hammer cylinder A is mounted integrally with the feed cylinder B upon a slide or guide C. In the feed cylinder B the piston D is adapted to reciprocate in such away as to move the hammer cylinder back and forth on the guide at the will of the operator. A suitable valve E is adapted to control the admission of pressure fluid to both the feed cylinder and the hammer cylinder. The drill steel F is clamped in a suitable vise Gr in tegral with the guide C in such a way that proper alignment with the punch pin can be maintained. At the front of this hammer cylinder A an anvil block H is held loosely within the front head J, which in turn is adapted to move slidably within the bore of the cylinder. The punch pin K is held by some suitable means in the anvil block H.

A differential piston L is adapted to reciprocate within the cylinder A. At the back end of the cylinder A a back head 0 is provided with a cylindrical portion adapted to fit slidably within a cylindrical hollow bore in the end of the cylinder.

17, 1925. Serial No. 76,104.

Through bolts P with shoulders Q are used to hold the front head J in fixed relation with the back head 0. The porting in the cylinder is such that no valves are required and the hammer is adapted to reciprocate with a uniform stroke. i

In Figure 1 the parts are so arranged that the front head assembly containing the anvil block is pushed into the cylinder until the abutments R make contact with the end of the cylinder S. As'a result the through bolts P hold the headO at an equivalent distance from the rear end T of the cylinder. In addition to this the anvil block H is forced rearwardly within same time the piston L does not strike against the cylindrical abutment U since the back head 0 is pushed away from the cylinder by means of the through bolts P.

In Figure 2 the piston 'D in the feed cylinder B is forcingthe cylinder A away from the drill steel, and as a result the back head 0 with its cylindrical abutment U is forced against the rearend of the cylinder A and by means of the through bolts P the front head assembly is forced away from the front end of the cylinder and the anvil block H is drawn forwardly in the front head J so that it does not project into the cylinder A. Thus, the piston L is in a position to deliver blows against the back head 0 through the abutmentU and these blows are transmitted by meansof the side bolts P, the front head J and the anvil block H to the punch pin K, tending to drive the punch pin out ofthe drill steel F. The valve assembly E is of any preferred type, such that motive fluid will be admitted into the feed cylinder B to drive the cylinder forward or to drive it backward at the same time that motive fluid is admitted into the cylinder to cause reciprocation of the ham the front head J and projects within the inc ment U nor to the actual means shown for establishing a fixed connection between the back head and the front head. My invention consists essentially in the idea of utiliz- Within the said cylinder a back cylinder ing a back head slidable within the cylinder as a means for receiving the hammer blows of thecylinder in driving out the punch pin.

I claim 1. A shank and bit punch for drill steels comprising a feed cylinder, a hammer cylinder, a reciprocating hammer piston within said hammer cylinder, a front cylinder head, a cylindrical abutment on said head for reciprocation in the end of said hammer cylinder, an anvil block loosely reciprocable in the said front cylinder head and adapted to carry a punch pin, a rear cylinder head, a cylindrical abutment on said head adapted to reciprocate within the rear end of the cylinder and to receive blows from the hamhead, a cylindrical abutment integral with said back head for reciprocation within the rearward end of said cylinder, and adapted to receive the blows of the piston directly under predetermined conditions of penetration of the cylinder, side bolts for holding the said cylinder heads in fixed relation to each other but slidable relation to the said hammer cylinder, whereby the hammer piston will deliver blows of impact to the said anvil block to drive the punch pin into the steel, or will deliver blows of impact to the said abutment on the back cylinder head for driving the said pin out of the steel.

8. In a shank and bit punch for drill steels, the combination of means for holding the drill steel, a hammer cylinder, a difierential hammer piston, a movable front cylinder head with a cylindrical abutment for limited reciprocation Within the front end of thecylinder, an anvil block carried within the said cylinder head and reciprocable therein, a punch pin carried by the anvil block, a movable back cylinder head with a cylindrical abutment for limited reciprocation in the rear end of said cylinder, adapted to receive the blows of the piston directly during its maximum penetration of the cylinder and means independent of the cylinder for holding the said cylinder heads in fixed relation each to each, a feed cylinder and piston for holding the punch against the drill steel and a single valve for motivating the said hammercylinder and the said feed cylinder.

In testimony whereof Ihave signedthis specification.

HYMAN LEVINE.

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