Differential hydraulic jack with damping system for the control

Details Differential hydraulic jack with damping system for the control Differential hydraulic jack with damping system for the control

1988-04-04

1989-02-28

Garrett, Robert E.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Position responsive

91417R, 91235, 91321, 91394, 91396, 92 85R, 92 85B, 200 82B, 277209, 277236, F15B 1522, F15B 1517

Patent

active

048075140

ABSTRACT:
A differential hydraulic jack with a damping system for the control of electric circuit-breakers is provided with a floating ring which produces a damping action at the end of travel and is also provided with a damping extension stud which forms part of the jack piston and penetrates into the damping ring. No provision is made on the jack piston for any packing ring forming a seal with the jack cylinder. The damping ring carries two projecting lips constituting a double valve which forms a leak-tight seal with the bottom face of the jack piston and the internal face of the cylinder end. At the end of the travel of the piston, the damping ring forms a double sealing valve for shutting-off the supply/drain orifice of the jack.

REFERENCES:
patent: 4026523 (1977-05-01), Gratzmuller
patent: 4065112 (1977-12-01), Leskovec
patent: 4289264 (1981-09-01), Rawlins
patent: 4296675 (1981-10-01), Gies

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