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Pain threshold gage and softness tester

  • US 4,505,278 A
  • Filed: 04/18/1983
  • Issued: 03/19/1985
  • Est. Priority Date: 04/18/1983
  • Status: Expired due to Fees
First Claim
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1. Apparatus for measuring the softness of materials comprising:

  • (a) a hollow gas-tight cylinder for confining a fixed amount of gas, said cylinder having a transparent wall,(b) a two-ended rod having a first end for pressing against the material and a second end being a piston adapted to slide in said cylinder to decrease the volume of the fixed amount of gas when said first end is pressed against the material,(c) indicia on the transparent wall of said cylinder for indicating the decrease in volume of the fixed amount of gas, and(d) a plate slidably mounted on said rod between said first and second ends outside of said cylinder, whereby said plate slides along said rod when said first end is pressed against the material and eventually contacts said cylinder to provide an indication of softness.

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