Multi-speed drop leg mechanical jack for use with a trailer

Details Multi-speed drop leg mechanical jack for use with a trailer Multi-speed drop leg mechanical jack for use with a trailer

2005-05-17

2005-05-17

Wilson, Lee D. (Department: 3723)

Implements or apparatus for applying pushing or pulling force

Vehicle attached jack

Screw actuated

C254S419000

Reexamination Certificate

active

06893006

ABSTRACT:
A mechanical jack that is used with trailers that has a functional combination of several working gears as well as a drop leg feature is disclosed. The mechanical jack has a gearbox having gears that not only have the capacity to handle a relatively heavy load, but also have the ability to handle small and midsize loads while maintaining sufficient and commercially acceptable cranking speeds without excessive force required. The jack includes a crank or handle for use with the mechanical jack that assists in both effective raising and lowering of the jack, as well as efficient transition from one working gear to another. The crank provides an efficient way to change from one operating gear of the jack to another, and facilitates operator use of the mechanical jack to which it is connected, in order to provide improved cranking and improved changing of one operating gear to another. The invention facilitates multiple working speeds and a drop leg speed to create a commercially valuable selection of working gear ratios and mechanical jack load capacities in a trailer (e.g., gooseneck, flatbed, etc.) operating environment.

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