Manually operable hydraulic actuator

Details Manually operable hydraulic actuator Manually operable hydraulic actuator

1977-12-08

1979-05-01

Geoghegan, Edgar W.

Power plants

Pressure fluid source and motor

Ram driven by fluid pumped from reservoir

60482, 60486, 81301, 417429, F15B 1309

Patent

active

041517202

ABSTRACT:
A manually operable hydraulic actuator which utilizes a main pump and an auxiliary pump to quickly develop a relatively large useful hydraulic force, for example, in applying compression accessories to stranded conductors such as cables. The main pump develops a relatively high pressure from a low volume of hydraulic fluid to develop the primary hydraulic force. The auxiliary pump develops a relatively low pressure from a high volume of hydraulic fluid to produce rapid advancement of a force-applying piston relative to a work piece. Both the main and auxiliary pumps are operated by the opposed swinging movement of two manually operable handles. One of the handles is selectively movable between a first position for simultaneously actuating both the main and auxiliary pumps and a second position for actuating the main pump only. A pressure relief system is provided to ensure development of the maximum rated pressure of the force-applying piston before retraction thereof can be effected.

REFERENCES:
patent: 1016692 (1912-02-01), Joyce
patent: 2659307 (1953-11-01), Framhein
patent: 2776624 (1957-01-01), Reinhard
patent: 2815646 (1957-12-01), Swanson
patent: 2821877 (1958-02-01), Swanson

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