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Compact Three-Degree of Freedom Load Cell

IP.com Disclosure Number: IPCOM000116491D
Original Publication Date: 1995-Sep-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 4 page(s) / 77K

Publishing Venue

IBM

Related People

Brodsky, WL: AUTHOR [+2]

Abstract

A compact load cell which can measure the forces and moment in a plane with negligible cross talk between channels is discussed. The load cell is a cantilever design and maintains parallelism of the load cell sensing face to the reference plane, allowing the reference coordinates for the force/moment measurements to be maintained.

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This is the abbreviated version, containing approximately 57% of the total text.

Compact Three-Degree of Freedom Load Cell

      A compact load cell which can measure the forces and moment in
a plane with negligible cross talk between channels is discussed.
The load cell is a cantilever design and maintains parallelism of the
load cell sensing face to the reference plane, allowing the reference
coordinates for the force/moment measurements to be maintained.

      Two methodologies for sensing are discussed.  Both use the same
basic structure for the load cell, but provide differences in
accuracy and equipment compatibility.  One being conventional strain
gauges, the other using displacement sensors.

      Fig. 1 shows the load cell.  In its simplest configuration it
is constructed of two plates and four rods.

      The four deformable members 1, 2, 3, and 4 are of circular
cross-section to provide uniform stiffness properties radial to the
long axis of the rods.  This allows them to deform uniformly for a
normal force Fx, Fy, or a torsional moment that creates Fx and Fy
components in the rods.  The summation of the components can produce
a force vector applied to the rod that is not parallel to the x or y
axis.  The circular cross-section deforms uniformly to the resulting
vector without geometric complications.

      For use with conventional strain gauge instrumentation, three
circuits of gauges would be applied.  One to measure each of the
force (x and y) axis and one set to measure the torque using
conventional circuit...