Tool driving or impacting – Impacting devices – With means for rotating tool
Patent
1975-05-05
1976-12-07
Leppink, James A.
Tool driving or impacting
Impacting devices
With means for rotating tool
173119, 173134, B25D 900
Patent
active
039957039
ABSTRACT:
A portable power tool wherein the housing contains a pump, a tank for a supply of oil for the pump, an electric motor for the pump and one or more hydraulic motors which receive pressurized oil from the pump and impart movements to a rotary and/or reciprocable tool, such as a rock drill or chisel. The motor which imparts reciprocatory movements to the tool is a cylinder and piston unit whose piston is rigid with a piston rod serving to strike against the tool whenever the piston performs a forward stroke. A valve assembly having a motor-driven rotary spool controls the flow of pressurized fluid to and the outflow of spent fluid from the cylinder. A spring brakes the rearward movements of the piston, and a bladder type accumulator is connected with the outlet of the pump. The tank is cooled by currents of air which are induced by a blower on the output shaft of the electric motor and which cool the electric motor before they reach cooling fins provided at the outer side of the tank.
REFERENCES:
patent: 2861778 (1958-11-01), Spurlin
patent: 3009522 (1961-11-01), Bedner
patent: 3150488 (1964-09-01), Haley
patent: 3620312 (1971-11-01), Krasnoff
patent: 3878902 (1975-04-01), Matsuo
Leppink James A.
Robert Bosch G.m.b.H.
Striker Michael J.
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