Geometrical instruments – Miscellaneous – Light direction
Patent
1994-09-23
1997-04-08
Bennett, G. Bradley
Geometrical instruments
Miscellaneous
Light direction
73146, G01B 520
Patent
active
056176392
ABSTRACT:
A transducer for use in a railroad track maintenance chord reference system for measuring the vertical and horizontal position of the rails of the track. The transducer is carried by a carriage riding on the rails and provides a signal indicative of the offset between the reference chord and the rails. Each transducer includes a uncounterbalanced arm mounted to the transducer housing by a low friction carriage. The arm engages and follows a reference chord causing the arm to move as the carriage moves with respect to the chord. A linear displacement transducer is mounted within the housing to provide a signal indicative of the arm position and therefore indicative of the position of the rails.
REFERENCES:
patent: 853126 (1907-05-01), Shires
patent: 3896665 (1975-07-01), Goel
patent: 3906789 (1975-09-01), Bingmann
patent: 4027397 (1977-06-01), Theurer et al.
patent: 4654973 (1987-04-01), Worthy
patent: 4691565 (1987-09-01), Theurer
patent: 5161312 (1992-11-01), Theurer et al.
Bennett G. Bradley
Pandrol Jackson, Inc.
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