Edgar D Engler

US Patent:

47638001, Aug 16, 1988

Filed:

Mar 19, 1986

Appl. No.:

6/848448

Inventors:

Edgar D. Engler - South Milwaukee WI
Gus J. Weber - Hinsdale IL
Melvin G. Stapel - Brookfield WI
John J. Mlaker - Milwaukee WI
Leonard Hanson - Milwaukee WI

International Classification:

B66C 2372

US Classification:

212195

Abstract:

A mobile lifting apparatus has a chassis with front driving wheels and steerable rear wheels. A vertical mast comprised of a pair of extendible hydraulic cylinders is spacedly mounted on the front of the chassis. One or more jam stay cylinders are mounted on the chassis rearwardly of the vertical mast. A pair of extendable booms are mounted on the vertical mast and jam stay cylinders. The load may be attached to the end of the booms. A hydraulic or other power supply extends and retracts the boom and drives the driving wheels. A counterweight is mounted on the rear of the chassis and the chassis may be extended to increase the capacity and stability of the lifting apparatus.