Robust consumer lifting device- three stage jack stand

Details Robust consumer lifting device- three stage jack stand Robust consumer lifting device- three stage jack stand

2006-10-31

2008-08-12

Wilson, Lee D (Department: 3723)

Implements or apparatus for applying pushing or pulling force

Hoisting truck

Single throw lever

C254S00200C

Reexamination Certificate

active

07410149

ABSTRACT:
A three stage jack stand has a base plate, and includes a first stage tubular rectangular housing. A second stage “U” shaped ratchet shaft has ratchet teeth on the forward edges, and is telescopically positioned in the housing. An upper base is attached to the ratchet shaft having a lower portion also extendable and retractable within the housing; and having a vertical cylindrical opening. A third stage tubular shaft has ratchet teeth in the left and right sides, and is telescopically positioned within the opening in the upper base, and has a lift collar mounted on the upper end. The tubular shaft is automatically controlled by a pair of pivotal upper dogs. The dogs have upper ends biased into a tooth of the tubular shaft, and have inclined lower ends that pivot the upper ends into disengagement when the lower ends are within the tubular housing. The second-stage ratchet shaft is controlled by a pair of pivotal lower pawls aligned with the teeth on the edges of the ratchet shaft, and is actuated by a spring handle.

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