Land vehicles – Wheeled – Attachment
Patent
1979-10-26
1982-03-09
Cohen, Irwin C.
Land vehicles
Wheeled
Attachment
60419, 60478, 60486, 91 4R, B60S 910, F15B 1302
Patent
active
043185509
ABSTRACT:
A hydropneumatic system, especially for operating landing gear of truck trailers, is operable from a source of pressurized air. The system includes separate first and second hydraulic fluid sources. Dual hydraulic cylinders are operated by the fluid. Each has a piston and an extensible member connected to the piston for providing extension and retraction of the gear legs in response to hydraulic pressure in chambers on opposite sides of the pistons. An air valve provides the pressurized air to one of the fluid sources for enabling it to provide hydraulic fluid. An air-operated hydraulic pressure boosting pump is selectively operable to boost the hydraulic fluid pressure thus provided to much greater than air pressure. A control valve selectively connects the hydraulic pressure booster to either the first or second chamber of each hydraulic cylinder for receiving the pressure-boosted hydraulic fluid for gear legs extension or retraction, while connecting the second or first chambers, respectively, to the nonselected hydraulic fluid source for returning hydraulic fluid. Each cylinder includes a pressure release valve to keep the landing gear extended until released by hydraulic pressure provided for retraction. The hydraulic pressure booster is of a reciprocating piston pump type and has an air pressure valving arrangement conserving air provided to its piston and ensuring proper piston reciprocation.
REFERENCES:
patent: 2239893 (1941-04-01), Jackman, Jr.
patent: 3100965 (1963-08-01), Blackburn
patent: 3177664 (1965-04-01), Konkle
patent: 3447319 (1969-06-01), Konkle
patent: 3648458 (1972-03-01), McAlister
patent: 3802318 (1974-04-01), Sibbald
patent: 3853037 (1974-12-01), Denzler et al.
patent: 4223531 (1980-09-01), Fukunaga et al.
Central Hydraulics Co.
Cohen Irwin C.
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