Tire pressure sensor
First Claim
1. A system for indicating inflation pressure of a rotatable tire of a vehicle comprising sensor means rotatable with said tire for sensing tire pressure of said tire, inflation pressure indicator display means on said vehicle an annular contact means connected to said sensor means and rotatable with said tire, said annular contact means having a plurality of annular contacts for delivering signals from said sensor means, a movable contact means having contact elements one for each of said annular contact means to move said movable contact means between an active position wherein each said contact element contacts a corresponding one of said annular contacts and a base retracted position wherein said elements are clear of said annular contacts, means for biasing said means to move to said base retracted position, said contact elements when said moveable contact means is in said active position electrically connecting said sensor means to said inflation pressure indicator display means, means to control said means to move, said means to control including means to prevent said means to move from positioning said moveable contact means in said active position when said tire is rotating relative to said vehicle whereby said movable contact means is in said base retracted position when said tire is rotating and may only be moved to active position when said means to prevent is overridden.
1 Assignment
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Accused Products
Abstract
A pressure sensing system is formed by a sensor mounted one to rotate with each tire and adapted to sense the pressure in the tire and generate a signal corresponding to the tire pressure, a movable contact system is moved into an operative position only when the vehicle is stopped and provides power (if required) to the sensor and contacts to deliver the electrical signals indicative of the tire air pressure to the vehicle body where it may be displayed for the operator'"'"'s convenience.
34 Citations
18 Claims
- 1. A system for indicating inflation pressure of a rotatable tire of a vehicle comprising sensor means rotatable with said tire for sensing tire pressure of said tire, inflation pressure indicator display means on said vehicle an annular contact means connected to said sensor means and rotatable with said tire, said annular contact means having a plurality of annular contacts for delivering signals from said sensor means, a movable contact means having contact elements one for each of said annular contact means to move said movable contact means between an active position wherein each said contact element contacts a corresponding one of said annular contacts and a base retracted position wherein said elements are clear of said annular contacts, means for biasing said means to move to said base retracted position, said contact elements when said moveable contact means is in said active position electrically connecting said sensor means to said inflation pressure indicator display means, means to control said means to move, said means to control including means to prevent said means to move from positioning said moveable contact means in said active position when said tire is rotating relative to said vehicle whereby said movable contact means is in said base retracted position when said tire is rotating and may only be moved to active position when said means to prevent is overridden.
Specification