Measuring and testing – Dynamometers – Responsive to torque
Patent
1979-07-05
1982-01-26
Woodiel, Donald O.
Measuring and testing
Dynamometers
Responsive to torque
G01L 310
Patent
active
043122418
ABSTRACT:
A load cell for measuring the force developed between reciprocating machine members as in a press or the like. The load cell has a cross-sectional configuration which will deform nonuniformly if subjected to nonuniform loading to distribute the load throughout the cell carrier. In one form the carrier is a hollow cylinder with a piezoelectric transducer secured to the wall. In another form the piezoelectric transducer is carried in a mounting ring supported in a hole through the cylinder wall. In both, the piezoelectric transducer is held under a preload with its axis at right angles to the direction of the machine force so that deformation of the carrier by the machine force reduced the stress on the transducer. An end plate assembly has a spherical ball and socket to accommodate press member misalignment. Another form of the load cell is an elongated member for measuring the load in a press brake. The hollow cylindrical load cell with the transducer mounted at an angle of 45.degree. to the cylinder axis measures torque, as in a rotating shaft. The load cell may use other force transducers, as a resistive strain gauge or a linear variable differential transformer.
REFERENCES:
patent: 2563425 (1951-08-01), Schaevitz
patent: 3129300 (1964-04-01), Moyles
patent: 3956930 (1976-05-01), Shoberg
Productronix, Inc.
Woodiel Donald O.
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