Jeffrey S Clements

US Patent:

20100116592, May 13, 2010

Filed:

Nov 11, 2008

Appl. No.:

12/269016

Inventors:

Jeffrey David Clements - Hartford WI, US
Rodney Wayne Rosenthal - Colgate WI, US

International Classification:

E06C 7/04

US Classification:

1821801

Abstract:

A stepladder with four individually adjustable, self-locking rails so that the ladder can be placed on uneven terrain then safely adjusted to maintain level orientation. The ladder rails will consist of four pairs of outer and inner rails. Each outer and inner rail pair is designed with profiles that when brought together will lock into one another providing stability yet minimal friction. Each inner rail is held in place by a spring-loaded lever with attached hooks. The spring forces the hooks to be engaged with an adjustment bracket that is fixed to the outer rail. A foot will be fixed to the bottom of each inner rail. Each foot will have arched surfaces along 2 perpendicular horizontal axes so that consistent surface area contact is maintained with the ground regardless of the angle of the ground. On a level surface, when the ladder is in an un-adjusted state, the four inner rails are designed to be extended with respect to the outer rails providing equal distance between each step and reducing weight and production costs.