Apparatus for suppressing quaky movements of mobile type crane

Details Apparatus for suppressing quaky movements of mobile type crane Apparatus for suppressing quaky movements of mobile type crane

1989-08-22

1990-11-13

Peters, Jr., Joseph F.

Traversing hoists

Having vertically swinging boom

Having means to swing boom vertically

212182, 212238, 91437, 60413, 60469, B66C 2356

Patent

active

049695622

ABSTRACT:
An apparatus for supressing vibration and quaky movements of a pivotally mounted boom on a mobile crane. The boom is supported for pivotal movement by a hydraulic cylinder which is subjected to abrupt forces when the crane is in motion. A hydraulic circuit is constructed to prevent such forces from damaging the hydraulic cylinder and vehicle body of the crane. The circuit is selectively operative to place the hydraulic cylinder in either a working or travel made. The circuit includes an accumulator and three change-over valves to control the flow of fluid in the hydraulic cylinder during the work and travel modes of operation.

REFERENCES:
patent: 4046270 (1977-09-01), Baron et al.
patent: 4085587 (1978-04-01), Garlinghouse
patent: 4341149 (1982-07-01), Dezelan
patent: 4367673 (1983-01-01), Krueck et al.
patent: 4674638 (1987-06-01), Oliphant

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