Tool driving or impacting – Impacting devices – Hammer head driven by electric motor
Patent
1976-08-06
1978-06-13
Leppink, James A.
Tool driving or impacting
Impacting devices
Hammer head driven by electric motor
173105, 92144, B25D 1100, B25D 900
Patent
active
040943658
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: 1911813 (1933-05-01), Decker
patent: 1920673 (1933-08-01), Baker
patent: 2638749 (1953-05-01), Sparano
patent: 2873735 (1959-02-01), Deliot
patent: 3150488 (1964-09-01), Haley
patent: 3695366 (1972-10-01), Klessig
Leppink James A.
Robert & Bosch GmbH
Striker Michael J.
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