Electrical resistors – Strain gauge type – Dynamometer type
Patent
1978-06-01
1980-04-29
Albritton, C. L.
Electrical resistors
Strain gauge type
Dynamometer type
246249, 338 2, H01L 122
Patent
active
042008565
ABSTRACT:
A railway car wheel detection arrangement employing a pair of clamp-on sensor units which are spaced apart a given distance and are positioned on the upper surface of the base flange of the track rail. Each of the sensor units includes an elongated epoxy glass board member having a reduced intermediate portion to which is attached a strain gage element. A pair of C-shaped clamps securely holds each of the sensor units to the base flange of the rail. The strain gage element is placed in tension by the stress in the track rail under the load of a wheel of a railway car to vary its resistance value which results in the unbalancing of a differential bridge circuit to produce a signal signifying the presence of a car wheel.
REFERENCES:
patent: 3009056 (1961-11-01), Bone et al.
patent: 3234777 (1966-02-01), Joy
patent: 3447367 (1969-06-01), Taylor
patent: 3448424 (1969-06-01), Laimins
patent: 3863192 (1975-01-01), Grey
patent: 4047144 (1977-09-01), Wong
Albritton C. L.
McIntire, Jr. R. W.
Sotak J. B.
Westinghouse Air Brake Company
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