Enclosed moment-insensitive load cell

Details Enclosed moment-insensitive load cell Enclosed moment-insensitive load cell

1989-08-09

1990-09-18

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

177179, 7386265, G01G 314, G01G 2102, G01L 2500

Patent

active

049571770

ABSTRACT:
A dual beam moment-insensitive load cell is hermetically sealed in a bellows or partial-bellows enclosure. The enclosure may have convolutions over substantially its entire length which permits it to flex easily in the direction of load cell bending. The enclosure is made resistant to elastic buckling under torsional forces produced by off-center loading of the load cell by one or more rods spaced circumferentially about the enclosure and connecting together a number of the convolutions after the convolutions are aligned. The alignment and torsional stiffening resist elastic buckling of the enclosure and resulting error in the output of the load cell. Another form of enclosure has one or more convolutions at each end and joined by a relatively straight, non-convoluted wall which itself is resistant to torsional elastic buckling. The resistance of the wall to torsional elastic buckling can be increased by increasing its thickness uniformly or by applying stiffener rods thereto.

REFERENCES:
patent: Re32746 (1988-09-01), Nelson et al.
patent: 4196784 (1980-04-01), Suzuki et al.
patent: 4208905 (1980-06-01), Spoor

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