Crane operating aid and sensor arrangement therefor

Details Crane operating aid and sensor arrangement therefor Crane operating aid and sensor arrangement therefor

1978-08-02

1980-09-16

Sheridan, Robert G.

Traversing hoists

With haul-in line

73141A, 340685, 364567, B66C 2390

Patent

active

042224918

ABSTRACT:
A crane operating aid comprises a load moment computer and a number of transducers which monitor crane parameters such as boom length, boom angle, and boom reaction forces. The computer then calculates the percentage of load capacity as a function of the crane manufacturer's published load rating tables. In cranes having booms which are luffed by a plurality of hydraulic lift rams, boom reaction forces are determined by providing separate pressure transducers on the lower or high pressure end of each ram. The upper or low pressure ends of the rams are in fluid communication with one another, requiring only a single pressure transducer. Each transducer generates an output signal as a function of the pressure which it is monitoring. The signals from the transducers associated with the high pressure ends of the rams are averaged and the difference between the output signal of the transducer associated with the low pressure ends of the rams and the average signal is used to generate a reaction force signal.

REFERENCES:
patent: 3965733 (1976-06-01), Hutchings et al.
patent: 4006347 (1977-02-01), Hohmann

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