Redken Laboratories Inc.

Transducers, Inc.

Frank E Golding

Emory W Farr

Apparatus for measuring tensile strength of hair samples in which the test is controlled automatically to provide the average value of a plurality of hair samples. The apparatus is digitally controlled to provide a rapid testing cycle time. Tension is applied by a pivoted arm, and rotated by a solenoid that is controlled digitally to provide substantially constant velocity to the arm. A strain gage secured to the arm measures the force extended by the arm in tensioning the hair sample.

Tensile strength tester for hair

A column type bonded strain gage load cell having improved linearity and output is achieved using a column having a pair of opposed transverse bores which create a web therebetween. The web has a relatively high strain as compared to the circumferential strain of an unbored column. Strain gages bonded to the web, in combination with strain gages bonded at selected regions on the column provide improved linearity and increased output.

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Hacienda Heights, CA, United States of America

Frank E Golding