Tool driving or impacting – Drive controlled by relative axial movement of tool – Reciprocating drive member connected to pulsing fluid column
Patent
1976-09-10
1977-12-27
Staab, Lawrence J.
Tool driving or impacting
Drive controlled by relative axial movement of tool
Reciprocating drive member connected to pulsing fluid column
173116, E21C 300
Patent
active
040649490
ABSTRACT:
In an electropneumatic hammer including an exciter piston and a percussion piston reciprocally displaceable within the bore of a guide cylinder, a sleeve-like clamping member is secured in an axially stationary position within the bore of the guide cylinder with the percussion piston passing through the clamping member. If there is no tool in the hammer and under certain other operating conditions, an axially displaceable tubular member located within the bore and laterally enclosing the clamping member, presses the clamping member inwardly into gripping contact with the percussion piston.
REFERENCES:
patent: 974267 (1910-11-01), Hennessy et al.
patent: 2260070 (1941-10-01), Wilhide
patent: 2260172 (1941-10-01), Decker
patent: 3741317 (1973-06-01), Unterschweiger et al.
patent: 3841418 (1974-10-01), Biersack
patent: 3921729 (1975-11-01), Schmuck
Hilti Aktiengesellschaft
Staab Lawrence J.
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