Percussion drilling apparatus

Details Percussion drilling apparatus Percussion drilling apparatus

1987-03-24

1989-04-18

Yost, Frank T.

Tool driving or impacting

Impacting devices

Hammer head constitutes piston of drive motor

173 91, 91416, B23B 4516

Patent

active

048218138

ABSTRACT:
A percussion drilling apparatus has a control unit in which a displacement reversing unit is arranged axially adjacent to a piston control unit, with the result that the control edges for the apparatus advance and apparatus return can be arranged in separate control sleeves. This control unit makes it possible to achieve better apparatus characteristics and higher overall efficiency of the apparatus.

REFERENCES:
patent: 3970153 (1976-07-01), Gien et al.
patent: 4221157 (1980-09-01), Schmidt
patent: 4530407 (1985-07-01), Rean

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