Hydraulic jack control device

Details Hydraulic jack control device Hydraulic jack control device

1977-11-11

1979-07-17

Michalsky, Gerald A.

Motors: expansible chamber type

With motive fluid valve

Pilot valve

91420, 91447, 91465, 137244, 137557, 13759614, F15B 13042

Patent

active

041611365

ABSTRACT:
A control unit for controlling the supply of fluid to a hydraulic jack, the control device including a main valve having a valve member normally held closed by pressure in a pressure chamber, the pressure chamber being fed with fluid through a bore in a valve member of the main valve. In one embodiment, a valve spindle slides in the bore to stop it being blocked. In another embodiment, designed to control a double-acting jack, the main valve is associated with a second similar main valve the pressure chamber of which is fed from the first main valve instead of through a bore in its valve member.

REFERENCES:
patent: 3598148 (1971-10-01), Kroffke
patent: 3989066 (1976-11-01), Sturman et al.

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