Force measuring device

Details Force measuring device Force measuring device

1987-03-02

1989-08-15

Lall, Parshotam S.

Boots, shoes, and leggings

364567, 36457103, 36457107, 177 2511, 177210FP, 177222, G01G 314, G01G 2110

Patent

active

048581453

ABSTRACT:
A force measuring device mainly used as a weighing device, comprising first and second horizontal cantilever members disposed parallel with each other in a common vertical plane, a weighing cradle attached to the free end of the first member, and a metal string stretched between the free ends of both members. The string is placed between a pair of magnetic poles so that it vibrates at its inherent frequency functionally relating to its tension and, therefore, a load applied to the weighing cradle. The frequency of the string is measured and the value of the applied load is calculated therefrom by an electronic calculating circuit. In order to overcome a problem of frequency deviation caused by variation in the spring constants of both cantilever members due to variation in the surrounding temperature, the inventive device includes a temperature sensor and arithmetic circuitry for applying compensation for the error due to the temperature change to the calculation of the applied force.

REFERENCES:
patent: 4070900 (1978-01-01), Engels
patent: 4165652 (1979-08-01), Olsen et al.
patent: 4418774 (1983-12-01), Whitney et al.
patent: 4490803 (1984-12-01), Briggs et al.

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