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Dual purpose tire gauge

  • US 4,916,944 A
  • Filed: 02/16/1989
  • Issued: 04/17/1990
  • Est. Priority Date: 02/16/1989
  • Status: Expired due to Fees
First Claim
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1. A dual purpose tire gauge comprising:

  • (a) a casing including an inlet end, an outlet end and a measurement scale for indicating tire air pressure and tire tread depth readings, the scale including a zero reading position;

    (b) a shaft seat disposed within the casing;

    (c) a rotatable shaft carried by the shaft seat, the rotatable shaft being provided with an indicator needle mounted thereon;

    (d) an elongate sliding bar;

    (e) means engaging the sliding bar to the rotatable shaft whereby movement of the bar along its longitudinal axis rotates the shaft and produces a corresponding reading by the indicator needle on the measurement scale;

    (f) a spring-biased piston positioned adjacent the inlet end, the piston being engageable against a first end of the sliding bar, whereby when the inlet end is disposed in engagement with an air valve of a tire, air pressure moves the piston against the spring bias and causes a second end of the sliding bar to extend outwardly from the outlet end, thereby producing a corresponding reading by the indicator needle of the tire air pressure;

    (g) the sliding bar including a stop pin engageable against the shaft seat for terminating retraction of the bar into the casing and disposing the indicator needle at the zero reading position; and

    (h) when the second end of the sliding bar is extended a sufficient distance from the outlet end, disposition of the second end within a tread spacing and engagement of the outlet end against the surface of a tire causes the indicator needle to produce a reading corresponding to the tire tread depth.

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