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Back incline indicator

  • US 4,958,145 A
  • Filed: 05/05/1989
  • Issued: 09/18/1990
  • Est. Priority Date: 05/05/1989
  • Status: Expired due to Fees
First Claim
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1. A back incline indicator for indicating whenever the back of a user is bent beyond an acceptable limit, comprising:

  • (a) a hollow casing having a side plate,(b) attaching means on the casing for securing the casing to the back of a shirt collar of a user with the side plate resting against the back of the user,(c) electric audio signal means in the casing having an electric circuit including a source of electric potential, and(d) electric tilt switch means in said electric circuit and mounted in said casing for closing said electric circuit and activating said signal means when said casing side plate is disposed in a plane which forms with a vertical line an included angle of a predetermined magnitude and for opening said circuit and deactivating said signal means when said casing side plate is disposed in a plane which forms with a vertical line an included angle of less than said predetermined magnitude.

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