Mobile crane with main and auxiliary counterweight assemblies

Details Mobile crane with main and auxiliary counterweight assemblies Mobile crane with main and auxiliary counterweight assemblies

1995-12-14

1996-12-24

Brahan, Thomas J.

Traversing hoists

Having counterweight or counterbalancing means

Counterweight movable relative to load support

212195, 212298, B66C 2376

Patent

active

055866670

ABSTRACT:
A mobile crane has main and auxiliary counterweight assemblies and is arranged such that the spar or mast on which the auxiliary counterweight assembly is mounted is of a two-piece construction such that, upon the imposition of a load on the main boom of the crane which is sufficient to deflect the boom, the outer end or tip of the spar pivots to lift the auxiliary counterweight assembly from the ground, thereby opposing the bending forces imposed on the boom and allowing the platform to rotate about a vertical slewing axis without obstruction from the auxiliary counterweight assembly. The spar and thus the entire crane is compact, lightweight, easy to assemble and disassemble, and can operate in a relatively restricted space without interference from obstacles around its rear. In the case of a crane having a telescoping boom, parts of the load line can be used to create a pendant effect which takes some of the bending forces out of the boom in addition to lifting the auxiliary counterweight assembly, thereby obviating the need for external pendant pay-out systems required on most telescoping cranes.

REFERENCES:
patent: 3842984 (1974-10-01), Brown et al.
patent: 4166542 (1979-09-01), Bryan, Jr.
patent: 4258852 (1981-03-01), Juergens
patent: 4492312 (1985-01-01), Poock
patent: 4540097 (1985-09-01), Wadsworth et al.
patent: 5005714 (1991-04-01), Kroll et al.
patent: 5035337 (1991-07-01), Juergens
patent: 5222613 (1993-06-01), McGhie
Grove Manufacturing Company, "Grove RT630 Hydraulic Cranes" Form No. SBRT630-15M pp. 1-14.

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