William B Shrum

US Patent:

46839887, Aug 4, 1987

Filed:

Sep 27, 1985

Appl. No.:

6/782800

Inventors:

William M. Shrum - Los Angeles CA

International Classification:

B66B 920

US Classification:

187 9E

Abstract:

A hydraulic drive system has a pair of cylinder/piston assemblies cascaded together and interfaced by a frame. The two assemblies are parallel, but not co-axial, so that in retracted position they may reside side-by-side, thereby minimizing the longitudinal space required to accommodate the system when in retracted position. Lateral torque resulting from the offset between the axes of the two cylinder/piston assemblies is resisted by causing the interfacing frame to slide against and ride between a pair of longitudinal rails, which resist the lateral forces resulting from the torquing of the frame.