Two-speed jack

Details Two-speed jack Two-speed jack

1995-03-20

1996-08-06

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Vehicle attached jack

Attached to trailer tongue

254425, 254103, B60S 902

Patent

active

055426476

ABSTRACT:
A jack of the type having inner and outer legs and a screw for extending and retracting the inner leg relative to the outer leg. The screw is mounted on a base fixed to the outer leg for rotating and limited endwise movement between the upper and lower positions relative to the base such that the screw and inner leg can move downwardly to the lower position when the inner leg is out of ground engagement and the inner leg moves the screw toward the upper position when the leg engages the ground. A rotary drive member is mounted for rotation relative to the base about the axis of the screw and a transmission mechanism responsive to rotation of the drive member drives the screw at a high speed ratio when the screw is in the lower position and at a low speed ratio when the screw is in the upper position.

REFERENCES:
patent: 2464890 (1949-03-01), Premo
patent: 2674438 (1954-04-01), Dalton
patent: 2747422 (1956-05-01), Walther
patent: 3632086 (1972-01-01), Mai
patent: 3861648 (1975-01-01), Glassmeyer
patent: 3892141 (1975-07-01), Phillips, Jr. et al.
patent: 4187733 (1980-02-01), Walther et al.
patent: 5199738 (1993-04-01), VanDenberg

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