Hydraulic striking device with impact frequency control

Details Hydraulic striking device with impact frequency control Hydraulic striking device with impact frequency control

1988-12-27

1990-08-28

Yost, Frank T.

Tool driving or impacting

Impacting devices

Length of cyclic travel of hammer head selectively adjustable

173119, 173134, 91235, 91277, 91290, 91330, B25D 918

Patent

active

049517570

ABSTRACT:
In the hydraulic breaker according to the present invention, oil pressure at a fixed value always flows in the circuit at a low pressure side whenever the piston is raised or lowered, to prevent the need for an accumulator in the circuit at the low pressure side. At the same time, a high pressure oil is required during the raising and lowering of the piston, bringing about less of a change in the surge pressure, attributing to the fact that there is no need for an accumulator in the circuit at the high pressure side. Moreover, the hydraulic breaker of the present invention is advantageous by providing an increased striking force because the high pressure oil is used, in addition to the reaction force of the compressed nitrogen gas, when the piston is lowered to strike the chisel.

REFERENCES:
patent: 3774502 (1973-11-01), Arndt
patent: 4314612 (1982-02-01), Thomas et al.
patent: 4466493 (1984-08-01), Wohlwend
patent: 4817737 (1989-04-01), Hamada

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