Weighing scales – Shock absorber – damper – Load-holder transmission mechanism
Patent
1980-05-27
1981-11-03
Miller, Jr., George H.
Weighing scales
Shock absorber, damper
Load-holder transmission mechanism
177210EM, 177229, G01G 2306, G01G 314, G01G 308
Patent
active
042980810
ABSTRACT:
A differential weighing system is provided which includes a primary suspension having an associated weigh pan for receiving a commodity to be weighed, a secondary suspension having a natural frequency matched to that of the primary suspension, and an electrical displacement transducer for producing an output in accordance with the relative displacement between the two suspensions. Damping to ground is provided for each suspension in combination with damping of the relative movement between the suspensions. The two inputs of a differential amplifier are connected to the outputs of a pair of sensing coils of the displacement transducer. A low pass filter having a cutoff frequency at or near the natural frequency of the suspensions is connected to the output of the differential amplifier.
REFERENCES:
patent: 2793026 (1957-05-01), Giardino et al.
patent: 3322222 (1967-05-01), Baur
patent: 3493773 (1970-02-01), Power
patent: 3494437 (1970-02-01), Fathauer
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