Land vehicles: bodies and tops – Tops – Let-down type top
Patent
1999-03-01
2000-11-21
Dayoan, D. Glenn
Land vehicles: bodies and tops
Tops
Let-down type top
29610708, 60429, 60476, F16D 3102, B60J 712
Patent
active
061492213
ABSTRACT:
Hydraulic control unit, in particular for the folding roof of a vehicle, comprising a reservoir for hydraulic fluid, a pump for drawing hydraulic fluid out of the reservoir and provided with a delivery port for delivering compressed hydraulic fluid, and also at least one first hydraulic actuator of the double-acting type with a first and a second variable working chamber, which working chambers are separated by a piston and are provided with a first and a second connection respectively for supplying hydraulic fluid to said working chambers, further comprising a control valve assembly with a first exit port and a second exit port, which are connected respectively to the first and the second connection of the first actuator, for controlling the movements of the first actuator. The control valve assembly comprises one or more operable control valves and is designed for selectively connecting one of the two or both exit ports thereof to the delivery port of the pump or the reservoir. In addition, an AND valve is provided, having a first and a second entry port and an exit port. The entry ports of the AND valve are connected here respectively to the first and the second exit port of the control valve assembly. The exit port of the AND valve forms a third exit port for controlling one or more following actuators of the hydraulic control unit.
REFERENCES:
patent: 2657533 (1953-11-01), Schanzlin et al.
patent: 5666873 (1997-09-01), Lindmayer et al.
patent: 5724878 (1998-03-01), Stolle et al.
patent: 5737992 (1998-04-01), Torrekens et al.
patent: 5760695 (1998-06-01), Huber
patent: 6039382 (2000-03-01), Mather et al.
Applied Power Inc.
Chenevert Paul
Dayoan D. Glenn
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