Patent GB-655817-A (GB)
Title: Improvements relating to vehicle hood actuating systems
IPC: B60J7/12
Filed: 1948-11-02
Abstract: 655,817. Vehicle hood actuating systems. WILMOT-BREEDON, Ltd. TUNNELL F. G., and DAVIES, J. B. HART-. Nov. 2, 1948, No. 28401. [Class 108(i)] [Also in Group XXIX] A vehicle hood actuating system comprises the combination of at least one double-acting reciprocatory hydraulic jack which actuates the hood, at least one singleacting hydraulic jack which actuates a hood cover, a pump arranged to supply liquid to the jacks, and electromagnetically operable valves which control the action of the system. Single acting hydraulic jacks j. f operating respectively a catch m and a hinged cover b and a double-acting jack d operating a vehicle hood a are controlled by liquid, from a reversible pump p of gear or other type, the liquid being directed by means of solenoid-operated valves g, r, s. Details of the valves q, r are shown in Fig. 2 and of the valve s in Fig. 3. When a switch 2 is closed a solenoid 10 of the valve q is energized and a valve member 5, 6 displaced into a position in which the end of a passage 13 is closed and the end of a passage 11 is opened. At the same time an electric motor t is energized and drives the pump p which supplies liquid in a direction indicated by an arrow 20. Thus liquid from the pump can flow to the jacks j, f and the jack plungers k, g respectively release the catch m and open the cover b. When the cover approaches its fully open position a switch 4 is closed (the switch is actuated by any convenient part of the mechanism associated with the cover) and this causes the valve s to be opened. Liquid can then flow out of the lower end of the jack d to the pump and allow liquid entering the upper end to move the plunger e in a direction for retracting the hood. After the hood has reached the retracted position the operation opens the switch 2 restoring the initial condition of the valves and stopping the motor and pump. Liquid then flows out of the cylinders f, j under the action of springs i, l, which retract the plungers g, k and returns through the valves q, r to the tank w. To extend the hood the switch 3 is closed causing the valve r to be operated instead of the valve q and, the motor and pump to be set in motion in the opposite direction. Liquid passes cut of the pump in the direction of the arrow 21 and through the valves r, q to the cylinders f, j. When the cover b approaches the fully open position the switch 4 is closed causing the valve s to be opened. Liquid can then enter the lower end. of the jack d and extend the hood. When the hood is extended the switch 3 is reopened and the springs i, l respectively return the cover and effect re-engagement of the catch m. There may be a jack d on each side of the vehicle body. When the cover comprises more than one movable part two or more jacks f may be provided. There may be more than one catch and each catch may be operable by a singleacting jack or the/or each catch may be manually operable. A single equivalent switch may replace the switches 2, 3. A shuttle valve v which also includes pressure relief valves is provided for reversing the flow connections with the pump.