Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1987-07-01
1988-09-27
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
7386259, G01G 314, G01L 110
Patent
active
047734930
ABSTRACT:
The invention relates to a weight measuring apparatus utilizing a vibration type force sensor having a greatly increased Q and being inexpensive and easy to manufacture. The force sensor includes a single vibratory beam or a pair of vibratory beams, which oscillate at a particular measurement frequency related to the stress applied to the sensor by a weight. A rotational mass is coupled to a nodal point of the vibratory beam at the measurement frequency, and greatly influence the frequency at which the beam will vibrate. As a result, the tolerances for manufacture of the force sensor are greatly relaxed, and the pendulum-like movement of the rotational masses for a double-ended tuning fork type sensor tends to override any mismatch between the two parallel vibratory beams.
REFERENCES:
patent: 3238789 (1966-03-01), Erdley
patent: 3411347 (1968-11-01), Wirth et al.
patent: 3437850 (1969-04-01), Bunger
patent: 3470400 (1969-09-01), Weisbord
patent: 3488530 (1970-01-01), Staudte
patent: 4037121 (1977-07-01), Nakamura et al.
patent: 4058007 (1977-11-01), Exner
patent: 4215570 (1980-08-01), EerNisse
patent: 4299122 (1981-11-01), Ueda et al.
patent: 4320320 (1982-03-01), Momosaki et al.
patent: 4321500 (1982-03-01), Paros et al.
patent: 4372173 (1983-02-01), EerNisse et al.
patent: 4378702 (1983-04-01), Meier
patent: 4384495 (1983-05-01), Paros
patent: 4406966 (1983-09-01), Paros
patent: 4446394 (1984-05-01), Albert
patent: 4503715 (1985-03-01), Greenwood
patent: 4538461 (1985-09-01), Juptner et al.
patent: 4541495 (1985-09-01), Willi et al.
patent: 4544858 (1985-10-01), Nishiguchi et al.
patent: 4618014 (1986-10-01), Kobayashi
patent: 4623030 (1986-11-01), Portman, Jr. et al.
"Force Sensor Using Double-Ended Tuning Fork Quartz Crystals," Proceedings of the 37th Annual Symposium on Frequency Control, pp. 248-254, 1983, by Shih S. Chuang.
"Practical Considerations for Miniature Quartz Resonator Force Transducers," Proceedings of the 37th Annual Symposium on Frequency Control, pp. 255-260, 1983, by Errol P. EerNisse and Jerome M. Paros.
Miller Jr. George H.
Sensor International
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