Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1978-01-30
1979-12-11
Hartary, Joseph W.
Weighing scales
Self-positioning
Electrical current generating or modifying
73141A, 177DIG3, 324DIG1, G01G 314, G01G 1944
Patent
active
041778685
ABSTRACT:
A weight-measuring and display device includes a rigid structural housing for supporting a load positioned thereon and a strain-sensing and weight-displaying circuit located within the structural housing. The rigid structural housing includes a top plate on which the user stands or the load is placed, a bottom plate and three deflection beams horizontally arranged between the top and bottom plates. Mounted to the top of each deflection beam is a strain gauge and mounted to the bottom of each deflection beam is another strain gauge. The group of three top mounted strain gauges accounts for the resistance in one arm of a wheatstone bridge and the group of three bottom mounted strain gauges accounts for the resistance in a second, adjacent arm of the wheatstone bridge. In addition to the wheatstone bridge, the strain-sensing and weight-displaying circuit further includes an amplifier portion, an analog to digital converter, a BCD to seven-segment decoder and three, seven-segment LED readouts.
REFERENCES:
patent: 2354390 (1944-07-01), Lowy
patent: 2899191 (1959-08-01), Hunt
patent: 3655003 (1972-04-01), Yamajima
patent: 3770069 (1973-11-01), Loshbough
patent: 3838744 (1974-10-01), Tanji
patent: 3853191 (1974-12-01), Yamagiwa
patent: 3967690 (1976-07-01), Northcutt
patent: 4082154 (1978-04-01), Pillote
Bowen Galt S.
Sanders Louis H.
Watkins Kenneth L.
Bio-Dynamics Inc.
Hartary Joseph W.
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