Helical load cell
First Claim
Patent Images
1. A load cell comprising:
- a helical coil;
first force sensing means disposed upon the coil;
second force sensing means disposed upon the coil and positioned substantially at 180 degrees relative to the first force sensing means; and
a bridge circuit coupling the first and second force sensing means;
whereby an output of the bridge circuit is indicative of a load experienced by the load cell.
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Accused Products
Abstract
A helical load cell includes a first pair of transducers disposed along a neutral axis of a helical coil. A second pair of transducers is disposed in diametrically opposed relation to the first pair. Sensitivity to side loading is eliminated by "splitting" the second pair of transducers. In another embodiment, each of the transducers in each pair are respectively oriented parallel and perpendicular to a neutral axis of the coil. This configuration provides a measure of torsional forces.
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Citations
20 Claims
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1. A load cell comprising:
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a helical coil; first force sensing means disposed upon the coil; second force sensing means disposed upon the coil and positioned substantially at 180 degrees relative to the first force sensing means; and a bridge circuit coupling the first and second force sensing means; whereby an output of the bridge circuit is indicative of a load experienced by the load cell. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A load cell comprising:
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a helical coil; a first transducer disposed on the helical coil; a second transducer disposed on a pitch of the helical coil separate from that of the first transducer, and in vertical alignment with the first transducer; a third transducer disposed on a pitch of the helical coil between those of the first and second transducers, and in diametrically opposed relation to the first and second transducers; and a fourth transducer disposed proximate the third transducer, and oriented substantially ninety degrees relative to the third transducer; the third and fourth transducers being equidistant from the first and second transducers. - View Dependent Claims (13, 14, 15, 16)
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17. A load cell comprising:
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a helical coil; a first pair of transducers mounted along a first neutral axis of the coil, each of the first transducers having a plurality of grid elements, each of the first transducers being arranged in perpendicular relation to each other and positioned relative to the first neutral axis such that the grid elements of one of the first transducers are parallel to the neutral axis and the grid elements of the other are perpendicular to the neutral axis; a second pair of transducers mounted along a second neutral axis of the coil, each of the second transducers having a plurality of grid elements, each of the second transducers being arranged in perpendicular relation to each other and positioned relative to the second neutral axis such that the grid elements of one of the second transducers are parallel to the neutral axis and the grid elements of the other are perpendicular to the neutral axis; and a bridge circuit coupling the first and second transducers; the first transducers being disposed in diametrically opposed relation to the second transducers. - View Dependent Claims (18, 19)
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20. A load cell comprising:
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a helical coil; a first strain gage device disposed upon either an outside or an inside diameter of the coil; a second strain gage device disposed upon either an upper or a lower surface of the coil, and proximate the first transducer means; and a bridge circuit coupling the first strain gage device to the second strain gage device.
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Specification