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US 2003/0112136 A1Published application
Tire pressure warning device
OwnerRodney B. Reidheadinventor
Life of this patent
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Abstract
A tire pressure warning device has a plunger slidable within a housing. The sliding of the plunger is controlled by the amount of air pressure supplied by the tire. A spring biases the plunger toward sensors in the housing. Sufficient tire pressure in the tire serves to keep the plunger spaced from the sensors. When insufficient pressure is applied by the tire, the spring moves the plunger against sensors to indicate a warning condition. Further reduction in tire pressure causes the plunger to move further and trigger an emergency condition.
Claims7
A tire pressure warning device, comprising:
- a housing for attachment to a tire valve stem, said housing having at least one side wall and bottom wall defining a chamber,
- a plunger slideably disposed in said chamber,
- a transmitter attached to said at least one side wall and forming a top wall,
- a first positive contact connected to said transmitter and extending into said chamber,
- a first negative contact connected to said transmitter and extending into said chamber,
- a second positive contact connected to said transmitter and extending into said chamber,
- a spring positioned between said bottom wall and said plunger for biasing said plunger towards said transmitter.
4 more elements
Dependencies are inferred from the claim text.