Weighing scales – Shock absorber – damper – Load holder
Patent
1983-05-09
1985-04-30
Broome, Harold
Weighing scales
Shock absorber, damper
Load holder
177184, 177210C, 177229, G01G 2306, G01G 2110, G01G 314, G01G 308
Patent
active
045138311
ABSTRACT:
A weighing system includes a weighing pan connected to a rigid armature by a mechanical filter constraining the armature to motion along a reference axis with respect to a housing and damping out transient forces along this axis resulting from the placement of objects on the pan. The mechanical filter includes spring and damping elements that provide a low-pass filter, that is, one that efficiently and quickly eliminates high frequency oscillations. In one form, the mechanical filter couples the pan to the armature. Because of this connection, friction in the mechanical filter does not result in frictional errors in the weighing measurement. In another form, a mechanical linkage couples the armature to the housing. A force transducer, comprising a pair of complementary opposed surfaces having a mutual separation which is related to the force across the transducer, is coupled between the armature and the housing. Coupled to the transducer is a position sensor which generates a signal representative of the separation between the complementary opposed surfaces of the transducer.
REFERENCES:
patent: 3991841 (1976-11-01), Crawley
patent: 4170270 (1979-10-01), Sette et al.
patent: 4382479 (1983-05-01), Lee et al.
Briefer Dennis K.
Lee Shih-Ying
Broome Harold
Foster Patrick W.
Setra Systems, Inc.
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