Tool driving or impacting – Impacting devices – Length of cyclic travel of hammer head selectively adjustable
Patent
1987-02-10
1989-04-04
Garrett, Robert E.
Tool driving or impacting
Impacting devices
Length of cyclic travel of hammer head selectively adjustable
173119, 173134, 91235, 91277, 91290, 91330, B25D 918, B25D 926
Patent
active
048177377
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.
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Hamada Takatoshi
Huang Wen-Ho
Garrett Robert E.
Kapsalas George
Nittetsu Jitsugyo Co., Ltd.
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