Pneumatic rock drill with peripheral piston clearance space

Details Pneumatic rock drill with peripheral piston clearance space Pneumatic rock drill with peripheral piston clearance space

1974-12-11

1976-11-16

Purser, Ernest R.

Tool driving or impacting

Impacting devices

Impact transmitting anvil

91232, 92162R, E21C 324

Patent

active

039918351

ABSTRACT:
A fluid operated reciprocating piston rock drill wherein the piston has a stem portion closely slidably received in a guide bushing and the cylinder of the rock drill provides clearance space around the head of the piston.

REFERENCES:
patent: 2041690 (1936-05-01), Baumeister et al.
patent: 2101159 (1937-12-01), Stevens
patent: 2694383 (1954-11-01), Larcen
patent: 2878990 (1959-03-01), Zurcher
patent: 2970546 (1961-02-01), White
patent: 3319534 (1967-05-01), Boonshaft
patent: 3666024 (1972-05-01), Beaumont

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