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.
申请公布号
US4763800(A)
申请公布日期
1988.08.16
申请号
US19860848448
申请日期
1986.03.19
申请人
ENGLER, EDGAR D.
发明人
ENGLER, EDGAR D.;WEBER, GUS J.;STAPEL, MELVIN G.;MLAKER, JOHN J.;HANSON, LEONARD