Motors: expansible chamber type – With motive fluid valve – Relatively movable serial valves
Patent
1991-10-16
1992-12-29
Look, Edward K.
Motors: expansible chamber type
With motive fluid valve
Relatively movable serial valves
91464, 91466, F15B 1108
Patent
active
051741890
ABSTRACT:
A fluid control apparatus which communicates a fluid cylinder with a fluid supply passage and a return passage, and a piston of the fluid cylinder is connected to a spoiler of an airplane.
The fluid control apparatus comprises a hydraulic passage and a check valve. The hydraulic passage is capable of communicating with cylinder chambers located at both sides of the piston. The check valve is opened by hydraulic pressure generated by backward movement of the piston.
The fluid control apparatus has a blow down valve characteristic so that the piston is allowed to move only in one direction by an external force when supply of fluid to the actuator is stopped because at least one of the supply passage and the return passage is damaged.
The fluid control apparatus further has a retainer and a manually operable member.
The retainer communicates the return passage with the hydraulic passage capable of communicating with cylinder chambers of the actuator. The manually operable member is used to located the retainer at a position wherein the return passage is communicated with the hydraulic passage.
According to the fluid control apparatus, the piston of the actuator can be readily moved upon maintenance and repairs or inspection by releasing the cylinder chambers of the actuator to atmosphere.
REFERENCES:
patent: 3792715 (1974-02-01), Parrett et al.
patent: 3943968 (1976-03-01), Treichler
patent: 4090429 (1978-05-01), Kamimura
patent: 4433615 (1984-02-01), Vick
patent: 4609019 (1986-09-01), Hutson
patent: 4667570 (1987-05-01), Jensen, Jr. et al.
Resnick et al., Physics, Third Edition, John Wiley & Sons, 1977, p. 122.
Look Edward K.
Teijin Seiki Co. Ltd.
Verdier Christopher M.
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