Multistage telescope boom

Details Multistage telescope boom Multistage telescope boom

1995-01-09

1996-03-26

Focarino, Margaret A.

Traversing hoists

Boom or mast

Extensible by sliding sections

212231, B66C 2304

Patent

active

055013465

ABSTRACT:
A multistage telescopic boom or jib, in particular for a loading crane on a truck, has hydraulic units each including a piston and a cylinder arranged between the successive, telescopically nested arms. A pipe projects axially from the bottom of the cylinder into the chamber of the cylinder, sealingly extending into the hollow piston rod when the piston is retracted and sealing the chamber of the cylinder from an inner chamber of the hollow piston rod. In order to ensure an automatic extension sequence of the telescopic arms, the inner chamber of each hollow piston rod is linked to the cylinder chamber of the next outer hydraulic unit by a preferably rigid line, and the inner chamber of each hollow piston rod communicates with the cylinder chamber of the same hydraulic unit when the piston is fully extended.

REFERENCES:
patent: 3658189 (1972-04-01), Brown et al.

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