Weighing apparatus of the vibratory string type

Details Weighing apparatus of the vibratory string type Weighing apparatus of the vibratory string type

1984-02-01

1985-09-17

Tarcza, Thomas H.

Weighing scales

Self-positioning

Electrical current generating or modifying

73580, G01G 316

Patent

active

045414955

ABSTRACT:
A weighing apparatus of the vibratory string type is disclosed, wherein a current-carrying string connected intermediate its ends between a movable load-responsive member and a frame vibrates in a magnetic field produced by a permanent magnet mounted on the frame. The ends of the string extend beyond the clamping connections with the movable member and the frame, respectively, for electrical connection with the conductors to the string drive and load detection circuit. This driving and detection circuit and the aforementioned conductors are mounted on a printed circuit board that is connected with the frame, thereby to avoid the need of a separate power supply with its disadvantageous effect on string vibrations. In one modification, the protruding string end associated with the movable member comprises a tension spring for prestressing the string.

REFERENCES:
patent: 3325579 (1967-06-01), Cookerly et al.
patent: 4058007 (1977-11-01), Exner
patent: 4378702 (1983-04-01), Meier

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