Sherman W Bushnell

US Patent:

44587856, Jul 10, 1984

Filed:

Oct 25, 1982

Appl. No.:

6/436304

Inventors:

Sherman W. Bushnell - Seattle WA

International Classification:

B66B 920

US Classification:

187 9E

Abstract:

A multistage portable lift has an arm projecting rearwardly from one of the movable lift stages and a reeving system including a cable transferring a downward counterbalancing force to the arm from a load at the front of the lift. In the preferred embodiment, the load support is caused to moved upwardly to the upper end of the top stage before the movable stages move relative to one another responsive to upward movement of the lowermost movable stage by an independent elevating means.

US Patent:

43900801, Jun 28, 1983

Filed:

Jan 26, 1981

Appl. No.:

6/228679

Inventors:

Sherman W. Bushnell - Seattle WA

International Classification:

E06C 520

US Classification:

182115

Abstract:

A multi-stage extensible tower on a wheeled base with a platform at the top has an extensible multi-sectioned ladder which slopes downwardly uniformly from the platform when the tower and ladder are in extended position. When the tower and ladder are in lowered, retracted position, the ladder sections have different slopes from one another. Outriggers are provided on the base which have a retracted position preventing extension of the tower. The platform has a fence which can be swung down level with the platform for conditions of reduced overhead clearance while the unit is being moved.