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Pneumatic tire pressure indicator

  • US 3,999,503 A
  • Filed: 01/09/1976
  • Issued: 12/28/1976
  • Est. Priority Date: 01/09/1976
  • Status: Expired due to Term
First Claim
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1. An indicator adapted to be attached to a valve stem having a valve pin of a pneumatic tire for designating a low pressure condition therein, comprises:

  • an imperforate tubular housing having front and rear end portions, said rear end portion being adapted to be attached to the valve stem;

    a member defining at least one transparent imperforate window in said housing;

    an attention-attracting member movably mounted within said housing and disposed normally out of proper orientation relative to said window to conceal said attention-attracting member from view;

    an elongated positioning device extending within said tubular housing between a position near said front end portion and a position near said rear end portion for engaging operatively the valve pin, said device further including moving means for moving said attention-attracting member relative to said window to expose said attention-attracting member therethrough;

    means connecting said elongated member and said attention-attracting member; and

    biasing means for urging resiliently said positioning device rearwardly against the force of the pressure within the tire so that when the pressure within the pneumatic tire falls below a predetermined value, said positioning device moves axially rearwardly to cause said members to be oriented properly for indicating purposes.

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