Safety valve for tailgates or the like

Details Safety valve for tailgates or the like Safety valve for tailgates or the like

1974-06-26

1976-09-14

Cohen, Irwin C.

Land vehicles: dumping

Tilting

With cover or endgate control

91356, 91426, 13762427, 13762569, B60P 104, F15B 1115, F15B 1304

Patent

active

039803368

ABSTRACT:
A four-way spool valve controls a double acting fluid motor for locking or unlocking a part such as a tailgate. The valve is spring-urged to a locking position and hand-operable to its unlocking position. A position at the end of the valve is pressurized when in the unlocking position to counteract the spring. This piston monitors supply pressure so that the valve will be automatically shifted to its locking position when pressure drops. This will insure a locked position of the part when pressure is reapplied.

REFERENCES:
patent: 2322611 (1943-06-01), Winkler
patent: 2598891 (1952-06-01), Cooke
patent: 2864402 (1958-12-01), Presnell
patent: 2868583 (1959-01-01), Harbers et al.
patent: 3139908 (1964-07-01), Strader
patent: 3354911 (1967-11-01), Fall
patent: 3404918 (1968-10-01), Lackey
patent: 3511276 (1970-05-01), Jessen et al.
patent: 3618984 (1971-11-01), Cook et al.
patent: 3762443 (1973-05-01), Sorenson

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