Communications: electrical – Selective – Having indication or alarm
Patent
1980-02-01
1981-11-03
Waring, Alvin H.
Communications: electrical
Selective
Having indication or alarm
200 614, B60T 1722
Patent
active
042988578
ABSTRACT:
A brake wear indicator system includes a brake pad having a support plate, a layer of friction material secured thereto and an electrical contact assembly which extends through the support plate to project into the layer of friction material and which comprises two terminal portions electrically insulated from each other and a connecting portion which electrically connects the terminal portions and is located wholly within the layer of friction material. The connecting portion is arranged to be exposed and abraded after prolonged abrasion of the friction material by contact with a braking surface whereby electrical contact between the terminal portions is broken. The contact assembly is connected to an electrical indicator circuit which produces a first warning signal when the layer of friction material has become abraded sufficiently to allow electrical contact between the connecting portion of the associated braking surface, and a second warning signal when the connecting portion has become sufficiently abraded to break the electrical connection between the terminal portions of the contact assembly.
REFERENCES:
patent: 3882448 (1975-05-01), Shibatani et al.
patent: 4016533 (1977-04-01), Ishikawa et al.
patent: 4188613 (1980-02-01), Yang et al.
Lindre Jaan
Robins Ronald F.
Ford Motor Company
Permut Steven L.
Sadler Clifford L.
Waring Alvin H.
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