Method and device for damping the movement of a hammer piston

Details Method and device for damping the movement of a hammer piston Method and device for damping the movement of a hammer piston

1974-12-16

1976-02-24

Leppink, James A.

Tool driving or impacting

Impacting devices

Hammer head driven by spring

173139, E21B 910

Patent

active

039399214

ABSTRACT:
A method for damping the movement of the hammer piston of a hammer mechanism and for catching the hammer piston in a forward end position when the drill tool is situated outside the operating range of the hammer piston is disclosed. During the return stroke of the hammer piston gas is driven from one chamber to another chamber through a slot. When the hammer piston exceeds its normal range of operation gas is driven through the slot in the other direction and also through a channel in the machine housing so that a weaker damping is obtained than during the return stroke. A hammer mechanism to be operated according to the above method is also disclosed.

REFERENCES:
patent: 2926637 (1960-03-01), Sparlin
patent: 3570608 (1971-03-01), Erma
patent: 3720269 (1970-12-01), Wanner et al.

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