Abrasion switch device for detecting low tire pressure

Details Abrasion switch device for detecting low tire pressure Abrasion switch device for detecting low tire pressure

1974-12-23

1977-02-01

Scott, James R.

Electricity: circuit makers and breakers

Special application

Pneumatic tire inflation responsive

200 6108, 200 6144, H01H 3524, H01H 316

Patent

active

040063267

ABSTRACT:
An alarm device signals a substantial drop in the inflation pressure of the tires on the wheels of an automotive vehicle. The device comprises a portion of an electric circuit located at the free end of a flexible rod which is covered with a layer of material of low resistance subject to abrasion. The covering material is removed by abrasion as the vehicle travels over the road if tire pressure is low. The electric circuit, consisting of two wire-like elements, may be either normally closed or normally open. In the latter instance, the separated wires are fused together. In both embodiments, this change in the condition of the circuit causes an alarm to be set off.

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patent: 3882448 (1975-05-01), Shibatani et al.
patent: 3902158 (1975-08-01), Dahlkvist

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