Safety system for use in association with material handling equi

Details Safety system for use in association with material handling equi Safety system for use in association with material handling equi

1978-02-21

1980-08-26

Kunin, Stephen G.

Traversing hoists

With haul-in line

340685, G08B 2100

Patent

active

042191211

ABSTRACT:
An improved apparatus is used on a crane to prevent engagement of a block with the outer end portion of a boom. When the block comes within a predetermined distance of the outer end portion of the boom, a detector assembly provides a danger signal. In response to this danger signal, an audio-visual alarm is activated and all control valves which are actuated to a position to cause the block to come in contact with the boom are moved toward to neutral positions. A linkage between a manually actuatable control lever and a control valve for a particular crane function includes a hydraulic cylinder. This cylinder is normally pressurized to a fully extended position, but when a danger signal is received indicating that the block is too close to the boom, the cylinder is retracted. This shortens the linkage and shifts the control valve to a neutral position.

REFERENCES:
patent: Re22525 (1944-08-01), White
patent: 1558635 (1925-10-01), Rutan
patent: 1834985 (1931-12-01), Stoner
patent: 2744637 (1956-05-01), Stewart
patent: 3204720 (1965-09-01), Eitel
patent: 3265220 (1966-08-01), Knight
patent: 3266638 (1966-08-01), Popov
patent: 3586841 (1971-06-01), Griffin
patent: 3792780 (1974-02-01), Spain
patent: 3952827 (1976-04-01), Drutchas
patent: 3969714 (1976-07-01), Greer
Advertising Circular, "Hydraulic Cranes," Grove Manufacturing Co., pp. 81.00, 82.00.

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