Frederick Demond Wilson

US Patent:

44973900, Feb 5, 1985

Filed:

May 23, 1983

Appl. No.:

6/497121

Inventors:

Frederick D. Wilson - Hendersonville NC

International Classification:

E06C 744

US Classification:

182202

Abstract:

There is provided a self-leveling ladder which is particularly useful on uneven surfaces. The ladder includes an attachment generally U-shaped in form having parallel tubes which are secured to the bottom portion of the legs of the ladder and a tubular bridging mechanism connecting the parallel tubes. Legs are received in the bottom portion of each parallel tube and a plurality of balls are received in the bridge portion and the top portion of the tubes. The balls act to transfer the force from one leg to the other so that when the bottom of the legs are placed on different levels the ladder will automatically level itself.