Single hand operated tool

Details Single hand operated tool Single hand operated tool

1978-11-09

1980-06-10

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Ram driven by fluid pumped from reservoir

60481, 60DIG10, 60468, 30180, F15B 1518

Patent

active

042066034

ABSTRACT:
A single hand held and operated tool comprising a housing; a hydraulic fluid reservoir located in the housing; a hydraulic pressure cylinder located in the housing; a hydraulic piston moving with respect to the pressure cylinder in response to hydraulic pressure produced therein; a hydraulic pump operable by a single hand while grasping the housing and coupled to the fluid reservoir and to the pressure cylinder for forcing hydraulic fluid received from the reservoir into the cylinder; and valve apparatus governing fluid communication between the hydraulic pump and the pressure cylinder and operative in response to hydraulic pressure in the cylinder for lowering the quantity of hydraulic fluid supplied to the cylinder by each pump stroke when the pressure in the cylinder exceeds a predetermined pressure, thus providing two-speed tool operation.

REFERENCES:
patent: 2250551 (1941-07-01), Pfauser
patent: 2820415 (1958-01-01), Born
patent: 2979032 (1961-09-01), Engquist et al.
patent: 3058214 (1962-10-01), Mekler
patent: 4149381 (1979-04-01), Mekler

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