DE409622C - Jackhammer, in particular rock drill, with device for holding the piston in place when it is empty - Google Patents

Description

GERMAN EMPIRE

ISSUED FEBRUARY 12, 1925

REICH PATENT OFFICE

PATENT LETTERING

CLASS 5 b GROUP

(M ₇₄₅₁₃

of the piston when striking empty.

Patented in the German Empire on July 26, 1921.

The purpose of holding the percussion piston in pneumatic hammers is to strike a blank space of the piston and thus premature wear and tear or breakage of the tool to prevent.

So far, attempts were made to accomplish this detention by a manually closing and opening au inlet element for compressed air, which is housed at the rear end of the rotary hammer in hand.

It is obvious that this facility requires a certain amount of attentive service demanded on the part of the worker and thus tiring in the long run. This evil one sought to counteract that one could hold the piston in place automatically in the event of a blank stroke with the help of introduced various auxiliary elements. The new facility has these familiar facilities with automatic mode of action

compared to the advantage of particular simplicity and reliability by adding no additional Machine parts only through a special design of the rear part of the percussion piston the automatic retention is achieved in the event of a blank strike.

In Fig. Ι and 2 the invention is illustrated, namely shows:

Fig. Ι the percussion piston in return movement after the blow on the hammer and

Fig. 2 the percussion piston at rest.

The operation of the device is as follows:

If the worker presses the tool against the work site, the cylinder lies down of the hammer against the collar of the tool, opening 1 is closed. The percussion piston releases the bypass opening 2 and the compressed air drives the percussion piston back, d. H. the hammer works. Now the hammer makes a blank blow so the insertion end of the tool moves out of the cylinder a little. Of the rear, cylindrical part of the percussion piston now closes the exhaust 3, and the front Part closes the bypass opening2 so that the percussion piston stops. That Any propellant that may collect in the front cylinder space can be discharged through opening 1 escape.

Claims (1)

Patent claim: Pneumatic hammer, especially rock drill, with device for Holding the piston when beating empty, characterized in that the percussion piston has a recess (4), the annular space of which with the rear cylinder chamber communicates, and which mediates the exhaust of the rear cylinder chamber during regular work of the hammer, while the exhaust (3) is closed by the rear piston part offset from the recess as soon as the Piston too far in the blank stroke due to lack of resistance to the tool (5) hits through. Fig.i. Fig. 2.