Weighing scales – With testing
Patent
1989-10-11
1990-12-18
Miller, Jr., George H.
Weighing scales
With testing
73 1B, G01G 1952, G01L 2500
Patent
active
049779699
ABSTRACT:
An electronic weighing apparatus is provided, including a self-contained calibration weight module that is operated by a motor to alternately connect and disconnect, respectively, a calibration weight relative to the vertically-displaceable parallelogram-guided load receiving member of the scale. The calibration weight is normally suspended in an inoperable condition by means of a pair of internally threaded sleeves rotatably supported in the cover portion of the housing of the calibration weight module. A motor is operable to rotate the sleeves and thereby lower lifting screws threadably connected therewith, whereby the calibration weight is lowered toward a supported position between and in engagement with a pair of parallel carrier arms that extend horizontally from the load receiver.
REFERENCES:
patent: 3698233 (1972-10-01), Braden et al.
patent: 3738439 (1973-06-01), Herbert
patent: 4184557 (1980-01-01), Kunz
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patent: 4425975 (1984-01-01), Luchinger
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patent: 4611676 (1986-09-01), Meiring
patent: 4627505 (1986-12-01), Kunz
patent: 4766965 (1988-08-01), Luchinger
Leisinger Roger
Meixner Erwin
Mettler Instrumente AG
Miller Jr. George H.
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