Overload control for lifting boom

Details Overload control for lifting boom Overload control for lifting boom

1975-02-14

1976-04-27

Spar, Robert J.

Traversing hoists

Overhead

Cable

73141A, 214762, 340267C, B66C 1348

Patent

active

039528790

ABSTRACT:
A machine has a movable boom for lifting a load, and an overload sensing device mounted on the boom to sense boom deflection. The overload sensing device includes a rigid beam having one end secured to a vertical side plate of the boom only by anchors spaced widely apart, welded preferably on opposite sides of the centroid or neutral axis of the boom side plate. The beam has a free end, on which an adjustable contact plate is carried, to engage a switch adjustably carried on a mounting plate secured to the beam side plate.

REFERENCES:
patent: 2030529 (1936-02-01), Nash
patent: 2319299 (1843-05-01), Converse
patent: 2988040 (1961-06-01), Aitken
patent: 3199685 (1965-08-01), Bopp
patent: 3737888 (1973-06-01), Cheze
patent: 3756423 (1973-09-01), Rathi

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