US1598426A - Shank and bit punch - Google Patents

Description

eating hammer piston of the machine.

Patented Aug. 31, 1926.

UNITED STATES 1,598,426 PATENT OFFICE.

JESSE DITSON, 0F LITTLETON, COLORADO, ASSIGNOR TO INGERSOLL-RAND COMPANY, 0F JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW' JERSEY.

SHANK A ND BIT PUNCH.

Application filed July 3, 1925.

This invention relates to shank and bit punches for drill steels, but more particularly to that type of machine in which the punch pin for the drill steel is hammered both into and out of the drill steel.

The objects of my invention are to provide a shank and bit punch which can be suspended within a drill sharpening shed by a chain or other iexible means and in which the pin carrying member, preferably in the form of an anvil block, is adapted to be driven in one direction or the other by blows of impact delivered directly to the anvil block by the fluid actuated recipro- A further object of my invention is to provide means whereby the operator can both guide the punch and control the reciprocation of the hammer piston with one hand thereby allowing him the use of the other hand for actuating the drill steel clamping apparatus, or for applying additional pressure on the punch either to force the punch pin into the drill steel bore or to pull it r out therefrom.

Further objects of the invention will hereinafter appear and to these ends the invention consists of the combinations of elements and arrangement of parts for carrying out said objects as illustrated in the .accompanying drawings, in which Figure l is a longitudinal sectional elevation of one form of the machine,

Figure 2 is a detail sectional elevation of the valve mechanism showing the valve in a different position,

Figure 3 is a transverse sectional View taken on the line 3-3 of Figure l looking in the direction of the arrows.

Referring to the drawings, the machine comprises the cylinder A having the front head B and the back head C connected by the usual through bolts D, not seen in Figures 1 and 2 but illustrated in Figure 3.

' The cylinder is provided with a valve chest E shown containing two valve chambers F and G, one chamber for the throttle valve H and the other chamber for the automatic pressure fluid distributing valve J for the hammer cylinder A.

Any suitable means may be provided for clampin and holding the drill steel K as by means oi'g the clamping jaws L and O which may be the jaws on a drill sharpening machine. In the form of the machine as Serial No. 41,271.

shown, the shank and bit punch is adapted to be suspended as by means of a chain P in front of the drill steel K and by grasping the handle Q the machine is guided and pushed towards and pulled away from the drill steel in order to permit the punch pin R tlo be driven into and out of the drill stoe The machine is provided with two rela tvely movable impact members mounted in the hammer cylinder A, one of these members comprising the hammer piston S and the other constituting the anvil 'block T in which the pin R is carried and held as by means of the key U. The anvil block T is formed with the rearwardly extending shank V passing through the piston S and is also provided with the front striking portion or abutment W shown as a collar or shoulder and the rear striking portion in the form of a nut X removably secured to the reduced screw threaded end Y of the anvil shank as by means of the cap nut Z. A washer or suitable packing a is provided between the striking portion or nut X and the securing cap nut Z.

The anvil or anvil block T as it may be termed, is guided in the front head B of the machine and the cap nut Z slidable in the back head C forms a guide for the rearward portion of the anvil. The front head B is formed with an enlarged recess b to receive the collar or striking portion W of the anvil and the back head C is likewise formed with the enlarged recess c to receive the striking portion or nut X of the anvil.

lVhen the machine is pushed towards the drill steel K, the striking portion or nut X of the anvil is carried into the recess c in the back head out of the path of the reciprocating hammer piston S while the forward striking portion iV of the anvil is brought into the path of the piston and the blows of impact of the piston are delivered directly to the anvil to hammer the pin into the steel. By pulling back on the machine the positions of the striking portions W and X of the anvil are reversed and the forward abutment lV is moved out of the path of the piston while the rearward striking portion or nut X is moved into the path of the piston as indicated in Figure 2 so that the blows of impact of the piston are delivered rearwardly against the striking portion X of the anvil and the pin is driven out of the steel by blows delivered directly to the anvil. I

Pressure fluid is supplied to the machine through the inlet d controlled by the throttle valve H having the valve stem e pivotally connected at f to the depending portion g of the handle Q which handle is in turn pivoted at It to the back head C. A guide pin j on the back head C enters a guide slot in the handle Q so that the handle may be rocked about the pivot h to control the throttle valve Il and permit pressure Huid to be supplied to the. machine or shut ofl from tho machine as desired. After the machine has been pushed forward by hand to center the pin in the drill steel, the handle Q is rocked to open the supply of pressure fluid to the hammer cylinder. The distributing valve J may be of any suitable form but in this instance is provided with the heads o, p, g and r controlling suitable ports and passages in the valve chest for supplying pressure fluid alternately to the ends of the hammer cylinder and hausting pressure fluid therefrom as indicated by the arrows. The valve chest in this instance is provided with exhaust ports 8 and t and also with the kicker ports u and 'v for operating the valve as is understood by those skilled in the art.

After the pin R has been driven into the drill steel, the machine is pulled rearwardly which removes the strikin portion IV of the anvil from the path o the piston and carries the striking portion X into the path of the piston and by leaving the throttle valve H open, the hammer S drives the pin out of the drill steel.

I claim:

1. In a shank and bit punch for drill steels, the combination of means for holding the drill steel, a hammer cylinder ada ted to be flexibly suspended within wor ing distance of the said means for holding the drill steel, a fluid actuated reciprocating hammer piston in said cylinder, an anvil block mounted in said cylinder and having a shank extending through the piston, a (pin carried by said anvil block and adapte to enter the drill steel, an abutment on the anvil block forwardly of the hammer piston to receive the blows of the piston for driving the anvil block and pin 1n one direction, another rearward abutment on the anvil block to receive the blows of the piston for driving the anvil block and pin in the op osite direction, a throttle valve normally lleld closed by spring means for actuating the said hammer piston, and a hand grip located on the said cylinder for guiding the punch with relation to the drill steel and adapted to control the said throttle valve for actuating the hammer iston.

2. In a shank and bit punci for drill steels the combination of means for clamping the drill steel, a hammer cylinder adapted to be flexibly suspended in the same longitudinal plane as the said drill steel clamping means and within a suitable working distance therefrom, a Huid actuated reciprocating hammer piston in said cylinder, an anvil block mounted in said cg'linder and having a shank extending t rough the piston, a pin carried by said anvil block and adapted to enter the drill steel, an abutment on the anvil block forwardly of the hammer piston to receive the blows of the piston for driving the anvil block and pin in the opposite direction, a throttle valve for controlling the reciprocation of the piston, spring means for nor mally holding the throttle valve closed, a grip attached to the cylinder for manually driving the cylinder towards the drill steel or for withdrawing it from the drill steel, and means connecting the said handle with the throttle valve whereby manual force a plied either to drive the cylinder towar s the drill steel or to Withdraw it from the drill steel will open the throttle valve and cause reciprocation of the piston.

In testimony whereof I have signed this specification.

JESSE DITSON.

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