E - Fixed Constructions – 04 – H
Patent
E - Fixed Constructions
04
H
214/20, 138/71.1
E04H 12/34 (2006.01) B66C 23/70 (2006.01)
Patent
CA 1045586
ABSTRACT OF THE DISCLOSURE There is disclosed a telescoping boom with first and second motors, each connected between adjacent boom sections to extend and retract one boom section with respect to the other. Each motor has a piston slideably received in a cylinder to define an extend chamber on one side of the piston and a retract chamber on the other side thereof. Each piston has a rod extending from the cylinder which has two passages therein, one communicating with the extend chamber and the other communicating with the retract chamber. A control valve has a first portion for control of the first motor and a second portion for control of the second motor. The hydraulic passage between the retract chamber of the second motor and the second valve portion includes the retract chamber of the first motor. The hydraulic passage between the extend chamber of the second motor and the second portion, and only that passage, passes over a real between said members. -1a-
250669
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