Single beam reference system for railway surveying

Details Single beam reference system for railway surveying Single beam reference system for railway surveying

1977-09-23

1980-01-22

Stephan, Steven L.

Geometrical instruments

Straight-line light ray type

Alignment device

33338, E01B 3508

Patent

active

041842669

ABSTRACT:
A railway surveying apparatus is disclosed. The apparatus has a light beam transmitter for transmitting a beam along the track, a light beam receiver and an intermediate shadow board all mounted on respective rail-engaging buggies so that the transmitter, receiver and board are located on the center line of the track. The shadow board and receiver buggies are connected through a twist transducer that measures the relative angular positions of the buggies. A pendulum is mounted on the receiver buggy and serves to measure the actual rail cross level condition at that point. A pendulum on the transmitter buggy and appropriate circuitry can reference the apparatus to either the track center line or one of the rails.

REFERENCES:
patent: 3750299 (1973-08-01), Plasser et al.
patent: 3775859 (1973-12-01), Sauterel

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