Single beam reference system for railway surveying

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

E - Fixed Constructions

01

B

33/94

E01B 35/08 (2006.01) E01B 35/00 (2006.01)

Patent

CA 1098691

SINGLE BEAM REFERENCE SYSTEM FOR RAILWAY SURVEYING ABSTRACT OF THE DISCLOSURE 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.

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