US 6,607,181 B2 · Scissor jack

Abstract

A scissor jack assembly with double-lead Acme threaded screw. Through use of urethane or similar material as a braking means, the jack assembly is operable with a self locking action over a wider range of loads and especially at lower loads where an Acme loading phenomenon that results in said self locking action has previously been unattainable. Faster and smoother jack operation is made possible by employing a thrust bearing, including a plurality of roller or ball bearings, with the jack assembly. A spacing washer is also provided to retain the threaded shaft within the trunnions of the jack assembly, in order that the ends of each of the trunnions need not be machined or stamped to retain the trunnions within the jack assembly. Utilizing such a spacing washer decreases the costs involved with manufacturing the jack assembly, while increasing the ability to repair the jack assembly.

Claims27

Dependent claims

A scissor jack assembly comprising:

a base member for resting the jack assembly against a substantially flat surface;
a support bracket assembly;
first and second lower arm members each of an open channel construction with outer sidewalls and having one end connected to said base plate;
first and second upper arm members each of an open channel construction with outer sidewalls and having one end connected to said support bracket assembly;
first and second trunnions connecting said upper arms with said lower arms, each said trunnion including a bore;
a rotatable shaft member extending into the bores of said first and second trunnions;
at least one spacer dimensioned to substantially occupy the space between the rotatable shaft and at least one arm member side wall for maintaining the position of said rotatable shaft within the area between planes created by the sidewalls of said upper or lower arm members;
and
a means for locking at least said spacer on said rotatable shaft member.

6 more elements

Dependencies are inferred from the claim text.

Scissor jack

Life of this patent

Scissor jack

Life of this patent

Abstract

Claims27