Force measuring apparatus, particularly balance, compensated for

Details Force measuring apparatus, particularly balance, compensated for Force measuring apparatus, particularly balance, compensated for

1993-12-14

1997-06-24

Donovan, Lincoln

Weighing scales

Self-positioning

Spring

177210EM, 73862621, G01G 300

Patent

active

056419481

ABSTRACT:
A force measuring apparatus includes a parallelogram guide composed of a fixedly supported parallelogram side member, two parallel guide members which are longitudinally stiff and bending-elastic in the plane of the parallelogram, and an additional parallelogram side member for receiving the force to be measured. The additional parallelogram side member is guided so as to be deflectable in parallel on the fixedly supported parallelogram side member by the guide members. A measuring transformer supplies a signal corresponding to the force to be measured. A device for transmitting at least a portion of the force on the measuring transformer to be measured acting on the deflectably guided parallelogram side member is coupled through the coupling member to the deflectable parallelogram side member. The coupling member is longitudinally stiff and bending-elastic in the plane of the parallelogram and the coupling member includes a localized area which is bending-elastic transversely of the plane of the parallelogram. For suppressing an error due to off-center loading, the axis of the transverse rotation of the deflectable parallelogram side member coincides with a localized transversely bending-elastic portion of the coupling member. In addition, an error caused by a deformation of the parallelogram guide in the plane of the parallelogram is compensated by placing the axis of the longitudinal rotation of the deflectable side member into the longitudinal axis of the coupling member.

REFERENCES:
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patent: 4143737 (1979-03-01), Jacobson
patent: 4453609 (1984-06-01), Griffen et al.
patent: 4454770 (1984-06-01), Kistler
patent: 4653599 (1987-03-01), Johnson
patent: 4657097 (1987-04-01), Griffen
patent: 4798251 (1989-01-01), Maaz et al.
patent: 4799561 (1989-01-01), Komoto
patent: 4964478 (1990-10-01), Stadler et al.
patent: 5191949 (1993-03-01), Mills et al.
patent: 5340951 (1994-08-01), Hungerbuhler et al.

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