Automatic grapple control system

Details Automatic grapple control system Automatic grapple control system

1978-04-27

1980-05-06

Paperner, L. J.

Material or article handling

Vertically swinging load support

Grab

60420, 91518, 294 88, B66C 316

Patent

active

042015103

ABSTRACT:
A grapple tong system has first and second hydraulic lines for closing and raising the grapple tongs, respectively. A hydraulic system is provided for automatically, controllably passing fluid from the second to the first line in response to a preselected pressure in the first line and a higher pressure in the second line for automatically, controllably urging the grapples to a closed position.

REFERENCES:
patent: 3631989 (1972-01-01), McCormick
patent: 3854766 (1974-12-01), Jordan
patent: 3865424 (1975-02-01), Jabkowski

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