Fluid-control system for a hydraulic percussion instrument

Details Fluid-control system for a hydraulic percussion instrument Fluid-control system for a hydraulic percussion instrument

1982-07-14

1985-04-02

Garrett, Robert E.

Expansible chamber devices

With cushioning means effective over a portion only of stroke

92 86, 92134, 173114, 173116, 173134, B25D 906, F16F 919

Patent

active

045080178

ABSTRACT:
A power cylinder of a hydraulic percussion implement, in whose bore a ram with an enlarged piston head is vertically reciprocable to strike a tool at the lower end of the bore, has a control chamber above the piston head alternately communicating with the high-pressure side and the low-pressure side of a source of hydraulic fluid, an annular recess in the bore being permanently or intermittently connected to high pressure acting upon the underside of the piston head. An annular drainage chamber formed by the bore at a lower level, disposed above an oil seal, collects liquid leaking down from that recess and returns it to the source. A pneumatic buffer lies in or communicates with that drainage chamber for absorbing hydraulic shocks generated when the ram strikes the tool.

REFERENCES:
patent: 1962168 (1934-06-01), Andrus
patent: 2808070 (1957-10-01), Malsbary
patent: 3905278 (1975-09-01), Ourdouille
patent: 3972396 (1976-08-01), Bochnak
patent: 4073350 (1978-02-01), Eklof et al.

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