Title: Vehicle tire pressure sensing device

Abstract: A casing is disposed in an air pressure chamber of a pneumatic tubeless tire and carries therein a switch cooperating with an alarm to produce an alarm signal upon a fall in the air pressure in the tire below a predetermined value. The switch is controlled by a leaf spring which is deformable by the movements, in one direction, of a flexible diaphragm deformable in response to variations in the air pressure in the tire. The leaf spring is returnable by its resilient force upon the movements, in another direction, of the diaphragm. The casing is fixedly mounted on a wheel rim through a projection extending outwardly of the tire from the casing through the rim.

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Inventors: Hayashi, Tadashi (Yokosuka, JA)

Application Number: 448519
Filing Date: 1974-03-05
Publication_date: 1976-02-10
Assignee: Nissan Motor Co., Ltd. (Yokohama, JA)
Primary Class(es): 340/448 73/146.3, 200/61.25, 200/83A, 340/441, 340/449
Other Classes:
US Patent Ref:

2655573	Oct, 1953	Szwargulski et al.	200/83.
3093812	Jun, 1963	Brown	340/58.
3155938	Nov, 1964	Meyers	340/58.
3296395	Jan, 1967	Fraser	200/83.
3501959	Mar, 1970	Womack	200/83.
3710314	Jan, 1973	Bell et al.	340/58.
3860772	Jan, 1975	Byrd	200/83.
3864537	Feb, 1975	Fiore	200/83.

Other Refs: 511,958

Apr, 1955	CA

Primary Examiner: Caldwell, John W.
Assistant Examiner: Nowicki, Joseph E.
Attorney: