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Tire pressure indicator

  • US 4,944,323 A
  • Filed: 12/16/1987
  • Issued: 07/31/1990
  • Est. Priority Date: 12/16/1987
  • Status: Expired due to Fees
First Claim
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1. A visual tire pressure indicator comprising an outer body having a structure defining an inner wall, a transparent outer body section, a vent aperture, a top opening internally lined with top threads and a bottom opening internally lined with bottom threads;

  • an inner cap fitted against the inner wall of the outer body and having at least one air inlet aperture wherethrough air is emitted and at least one air outlet aperture wherethrough air passes;

    an inner body having an outer wall, an inner wall, and secured to said inner cap;

    an indicator sleeve means slidably disposed around said inner body;

    a calibrated spring means helically surrounding said inner body and contacting a top end of said indicator sleeve means for biasing said indicator sleeve means towards said inner cap;

    a valve core body threadably engaged to the top threads and fitted against the inner wall of the inner body, said valve core body having a structure defining a longitudinal bore;

    an air flow control rod slidably disposed in said longitudinal bore;

    a valve core cap secured to said air flow control rod; and

    a valve core spring means disposed around said air flow control rod and in said longitudinal bore for biasing said valve core cap against the valve core body.

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