Shear beam load cell
First Claim
1. A shear beam load cell comprising:
- (a) a beam member having--(i) a first deflectable weigh portion for receiving a load force to be measured,(ii) a second relatively rigid support portion for supporting said beam member, and(iii) recesses formed in opposing sides of the first weigh portion for defining an unsymmetrical I-shaped transverse cross-section, wherein the recesses have dimensions such that the bottom wall surface of one of the recesses is insensitive to torsion; and
(b) strain gage sensing means positioned in said one recess on the bottom wall surface insensitive to torsion for measuring the shear strain corresponding to the load force applied to the first weigh portion.
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0 Petitions
Accused Products
Abstract
A shear beam load cell comprising a cantilevered beam member having a free end weigh section for receiving a load force to be measured, a mounting section for securing the beam member, and recesses formed in opposing sides of the cantilevered beam free end weigh section for defining an unsymmetrical I-shaped cross-section. The recesses have dimensions such that one of the recesses has its bottom wall surface insensitive to torsion. In one embodiment, the recess with the bottom surface insensitive to torsion has a depth longer than the other recess. In another embodiment, the recess with the bottom surface insensitive to torsion has a height shorter than the other recess. A strain gage sensing device is positioned in that one recess on that bottom wall surface insensitive to torsion for measuring the shear strain corresponding to the load force applied to the free end weigh section of the beam member. This shear beam load cell requires only a strain gage sensing device in that one recess connected to the four different arms of a Wheatstone bridge circuit for electrically measuring the principal shear strains associated with the load force.
25 Citations
22 Claims
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1. A shear beam load cell comprising:
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(a) a beam member having-- (i) a first deflectable weigh portion for receiving a load force to be measured, (ii) a second relatively rigid support portion for supporting said beam member, and (iii) recesses formed in opposing sides of the first weigh portion for defining an unsymmetrical I-shaped transverse cross-section, wherein the recesses have dimensions such that the bottom wall surface of one of the recesses is insensitive to torsion; and (b) strain gage sensing means positioned in said one recess on the bottom wall surface insensitive to torsion for measuring the shear strain corresponding to the load force applied to the first weigh portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A shear beam load cell comprising:
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(a) a cantilevered beam member having-- (i) a first free end deflectable weigh section for receiving a load force to be measured, (ii) a second mounting section for mounting said beam member, and (iii) recesses formed in opposing sides of said cantilevered beam free end weigh section for defining an unsymmetrical I-shaped transverse cross-section, wherein the recesses have dimensions such that the bottom wall surface of one of the recesses is insensitive to torsion; and (b) a strain gage sensing means positioned only in said one recess on the bottom wall surface insensitive to torsion for measuring the shear strain corresponding to the load force applied to said free end weigh section. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification