Hydraulic jack

Details Hydraulic jack Hydraulic jack

1988-05-06

1989-09-12

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Platform type

254 84, 254DIG1, B66F 308

Patent

active

048652938

ABSTRACT:
A hydraulic jack, for lifting a heavy-weight structure such as a wing of an airplane, comprises a vertical primary cylinder, a ram vertically movably inserted in the primary cylinder, a lock nut threadedly mounted on an external thread of the ram, a first gear provided on the lock nut, a nut rotatably supported in a housing, a second gear provided on the nut and releasably meshing with the first gear of the lock nut, and a screw rod extending parallel to the ram and connected to the ram via a bracket. The screw rod has a second external thread and threadedly extends through the nut for vertical movement.

REFERENCES:
patent: 2751191 (1956-06-01), Schroeder
patent: 3188106 (1965-06-01), Vlinski
patent: 3309062 (1967-03-01), Jansz
patent: 3321182 (1967-05-01), Elenburg
patent: 3362351 (1968-01-01), Robertson
patent: 3779399 (1973-12-01), Shigeno et al.
patent: 4013267 (1977-03-01), Kirk
patent: 4149451 (1979-04-01), Axelsson

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