Tool driving or impacting – Impacting devices – Hammer head constitutes piston of drive motor
Patent
1991-10-16
1993-02-02
Yost, Frank T.
Tool driving or impacting
Impacting devices
Hammer head constitutes piston of drive motor
173135, 173212, 91234, E21B 100
Patent
active
051831210
ABSTRACT:
This heavy duty equipment comprises a working cylinder, a striking piston, an upper lid and a holder of a drill bit. An anterior side duct in the wall of an upper working space of the working cylinder, communicating via an upper filling duct and a posterior side duct with a storage space provided in the upper lid, and an anterior bypass duct communicating via an axial duct in an axial pin and a posterior bypass duct with the storage space, axially define in the upper working space of the working cylinder, a compression space confined by the inner wall of the working cylinder, and further by an anterior face of the upper lid and by the external surface of the axial pin. The upper lid together with the axial pin and the in-built storage space form an assembly group in which a water valve is received.
REFERENCES:
patent: 2810549 (1957-10-01), Morrison
patent: 3225841 (1965-12-01), Thompson
patent: 3503459 (1970-03-01), Schindler
patent: 3599730 (1971-08-01), Tyreso et al.
patent: 3724560 (1973-04-01), Tibbott
patent: 4790390 (1988-12-01), Sweeney
patent: 4923018 (1990-05-01), Meek
Permon, statni podnik pan
Smith Scott A.
Yost Frank T.
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