Tool driving or impacting – Impacting devices – Impact transmitting anvil
Patent
1990-04-30
1991-11-12
Rosenbaum, Mark
Tool driving or impacting
Impacting devices
Impact transmitting anvil
91170R, 91243, 91300, B25D 918
Patent
active
050640054
ABSTRACT:
Hydraulic hammers are normally controlled by an actuating valve which controls the flow of fluid from a source of pressurized fluid to the hydraulic hammer. During certain periods of operation, the actuating valve totally blocks communication of fluid to the hydraulic hammer, thereby causing the fluid from the source of pressurized fluid to be expelled through a relief valve. The subject hydraulic hammer and control arrangement therefor includes an accumulator for storing the pressurized fluid from the source of pressurized fluid during periods of fluid blockage by the actuating valve and for supplementing the flow of fluid from the source of pressurized fluid when the actuating valve is communicating pressurized fluid to the hydraulic hammer. This increases the overall efficiency thereof.
REFERENCES:
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patent: 4179983 (1977-12-01), Wallace
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patent: 4646854 (1987-03-01), Arndt et al.
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patent: 4715265 (1987-12-01), Graul et al.
patent: 4825960 (1989-05-01), Krone
patent: 4945998 (1990-08-01), Yamanaka
Caterpillar Inc.
Grant John W.
Rosenbaum Mark
Smith Scott A.
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