Hydraulically powered percussion drill

Details Hydraulically powered percussion drill Hydraulically powered percussion drill

1973-10-29

1976-05-11

Cohen, Irwin C.

Expansible chamber devices

With cushioning means effective over a portion only of stroke

92 9, 173134, 173139, 188284, 188318, B25D 900, F01B 1102

Patent

active

039554783

ABSTRACT:
The improved hydraulically actuated percussion drill described hereinafter is designed to reciprocate a striker piston contained therein regardless of whether or not the striker piston engages the drill steel whereby vibration can be imparted to the drill. The drill includes an overtravel portion that cooperates with the striker piston to prevent metal-to-metal contact of the striker piston with the housing during operation. Means are provided to prevent the loss of fluid from the overtravel chamber whereby the striker piston will be returned to the upper end of its stroke and will not become stalled in the overtravel chamber.

REFERENCES:
patent: 2354340 (1944-07-01), Utter
patent: 3045650 (1962-07-01), Ambrosini
patent: 3220517 (1965-11-01), Lorenz
patent: 3596562 (1971-08-01), Foster et al.
patent: 3701386 (1972-10-01), Feucht
patent: 3887019 (1975-06-01), Reynolds et al.

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