Hydraulically operable landing gear

Details Hydraulically operable landing gear Hydraulically operable landing gear

2005-05-24

2005-05-24

Hurley, Kevin (Department: 3611)

Land vehicles

Wheeled

Attachment

C254S419000

Reexamination Certificate

active

06896289

ABSTRACT:
A vertically adjustable landing gear system for a trailer includes a pair of vertically adjustable lifts, a hydraulic motor having a pair of rotational outputs and a pair of landing gear drive shafts, each rotationally engaging one of the respective lifts and one of the respective rotational outputs to vertically adjust the lifts. A relief valve relieves hydraulic pressure to allow manual operation of the lifts in case of hydraulic system failure. An alternate landing gear system includes a single landing gear drive shaft rotationally engaging the pair of lifts and a drive shaft engagement mechanism engaging the rotational outputs and the drive shaft to transfer rotational motion from the rotational output to the drive shaft.

REFERENCES:
patent: 2875980 (1959-03-01), Grace
patent: 3077120 (1963-02-01), Viehweger, Jr.
patent: 3136527 (1964-06-01), Griffis
patent: 3189322 (1965-06-01), Hadek
patent: 3201087 (1965-08-01), Dalton
patent: 3784160 (1974-01-01), Phillips
patent: 4116315 (1978-09-01), Vandenberg
patent: 4281852 (1981-08-01), Konkle
patent: 4345779 (1982-08-01), Busby
patent: 4466637 (1984-08-01), Nelson
patent: 5004267 (1991-04-01), Busby
patent: 5299829 (1994-04-01), Rivers, Jr. et al.

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