PURPOSE: To measure the warp of a rail with high accuracy by disposing a laser radiator and laser beam receiving dial plate spaced by a predetermined distance from each other on the rail to measure a laser beam spot.
CONSTITUTION: A transmitting side truck 3 and receiving side truck 4 are fixed to the outside rail 2a of a track at a predetermined interval. A straight part measuring laser radiator 5 and a laser beam receiving dial plate 7 and fixed within the range covered by the laser beam. When the laser beam is applied from the laser radiator 5 to the dial plate 7, a laser beam spot reaching the dial plate 7 is located on the center point of vertical and horizontal scales of the dial plate 7 and the locus of the laser beam is located on the extension of the rail 2a. The receiving side truck 4 is intermittently moved as the laser beam radiator is fixed to measure the upper, lower, left and right deviations of the laser beam spot, i.e., measure and plot the deviations observing the display on a monitor 9. A curve part is also measured similarly by a curve part measuring laser radiator.
OTA MASANORI
SAITO ISAO
NISHIHARA YOSHITO
SENRI SOKKI SEISAKUSHO KK