Force measurement device
AssigneeIllinois Tool Works Inc.
InventorsSunder Ramasubbu, Somayya Ammanagi, Vishal Raina, Shivakumar C N, Murali Mohan
Life of this patent
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Abstract
The present invention relates to a force measurement device that includes mechanical amplification of linear elastic deformation along the axis of loading by estimating the quasi-linear incremental displacement between two points on arcs inscribed due to angular movements of a pair of cantilever arms located on opposite quadrants on a closed contour load sensing element to improve the sensitivity, and hence the resolution, of the force measurement device.
Claims20
A force measurement device comprising:
- a closed contour load sensing element axisymmetric along a loading axis and an axis normal to the loading axis;
- a first cantilever arm mounted on the contour in a first quadrant of the contour, and a second cantilever arm mounted in a second quadrant of the contour opposite the first quadrant, where free ends of both the first and second cantilever arms are inward of the contour;
- wherein deformation (δ/2) caused by applied load (P) causes quasi-linear movement of the free ends of the cantilever arms to enable mechanical amplification of the deformation along the axis of loading;
- and
- wherein, under compression load, the first and second cantilever arms turn counterclockwise by an angle β/2.
A force measurement device comprising:
- a closed contour load sensing element axisymmetric along a loading axis and an axis normal to the loading axis;
- a first cantilever arm mounted on the contour in a first quadrant of the contour, and a second cantilever arm mounted in a second quadrant of the contour opposite the first quadrant, where free ends of both the first and second cantilever arms are inward of the contour;
- wherein deformation (δ/2) caused by applied load (P) causes quasi-linear movement of the free ends of the cantilever arms to enable mechanical amplification of the deformation along the axis of loading;
- and
- wherein, under tension load, the cantilever arms turn clockwise by an angle β/2.
A force measurement device comprising:
- a closed contour load sensing element axisymmetric along a loading axis and an axis normal to the loading axis;
- a first cantilever arm mounted on the contour in a first quadrant of the contour, and a second cantilever arm mounted in a second quadrant of the contour opposite the first quadrant, where free ends of both the first and second cantilever arms are inward of the contour;
- wherein deformation (δ/2) caused by applied load (P) causes quasi-linear movement of the free ends of the cantilever arms to enable mechanical amplification of the deformation along the axis of loading;
- wherein the first and second cantilever arms have equal lengths, such that, an imaginary line (l1l2), passing through the free ends (m1,m2) of the first and second cantilever arms, also passes through the center of the contour;
- and
- wherein under the applied load P and corresponding deformation β/2 the free ends (m1,m2) of the cantilever arms respectively make quasi-linear movement on imaginary arcs (r1,r2);
- these quasi-linear angular movements lead to formation of an imaginary line (l1l2) which enables a mechanical amplification (Δ) of four times the deformation (β/2).
Dependencies are inferred from the claim text.