Weighing scales – Self-positioning – Repositioning in response to deflection under load
Patent
1984-08-24
1985-10-08
Miller, Jr., George H.
Weighing scales
Self-positioning
Repositioning in response to deflection under load
177210EM, G01G 700
Patent
active
045454485
ABSTRACT:
Weighing apparatus of the electromagnetic load compensation return-to-zero type including a vertically displaceable load support member to which is connected a load compensation coil arranged for movement in a stationary magnetic field, characterized in that the magnetic field is produced by at least one permanent magnet mounted in a hollow yoke structure defined by a pair of U-shaped yoke members each formed of a ferromagnetic material. The yoke members are arranged in opposed coaxial relation with their leg portions being parallel and extending toward each other. The yoke members are relatively angularly displaced about their common axis through an angle of 90.degree., the leg portions of one yoke member extending between the leg portions of the other member.
This design affords improved ease of assembly of the weighing apparatus and avoids the use of an additional magnet screen, thereby reducing the height of the yoke since the substantially enclosed hollow yoke structure has only a very small stray magnetic field.
REFERENCES:
patent: 4090575 (1978-05-01), Kunz et al.
patent: 4311202 (1982-01-01), Kunz
patent: 4337838 (1982-07-01), Kunz
patent: 4429757 (1984-02-01), Kunz
Mettler Instrumente AG
Miller Jr. George H.
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