Method and apparatus for monitoring the effective load carried b

Details Method and apparatus for monitoring the effective load carried b Method and apparatus for monitoring the effective load carried b

1988-07-20

1990-03-06

Swann, III, Glen R.

Communications: electrical

Condition responsive indicating system

Specific condition

212150, G08B 2100

Patent

active

049069810

ABSTRACT:
This is a method and apparatus for monitoring the effective load carried by a crane having a luffing boom of variable effective length. The method includes generating a first signal corresponding to the magnitude of the load supported by the boom and then a second signal corresponding to the effective radius. Calculations are made to calculate a moment value and displaying same. This is then compared with a predetermined maximum permissible moment value and a warning signal is generated it if differs from the maximum load moment value by less than a predetermined amount. The apparatus provides apparatus for carrying out the method by generating a first signal corresponding to the load supported by the boom and a second signal corresponding to the effective radius and includes processing means for performing calculation of the first and second signals to derive the load moment value and displaying same and memory means for storing a predetermined maximum permissible load moment value and comparative means for comparing the calculated load moment value with a predetermined maximum permissible load moment value.

REFERENCES:
patent: 3771667 (1973-11-01), Becker
patent: 3870160 (1975-03-01), Hutchings
patent: 4039084 (1977-08-01), Shinohara
patent: 4185280 (1980-01-01), Wilhelm
patent: 4216868 (1980-08-01), Geppert
patent: 4509376 (1985-04-01), Thomasson
patent: 4752012 (1988-06-01), Juergens
patent: 4833615 (1989-05-01), Bitner et al.

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