Castor for trolley adapted to be immobilized on a travelling walkway

摘要

A trolley castor having two flanges which freely rotate about a spindle carried by arms of a yoke is described. The flanges are separated by a distance corresponding to the usually standardized distance between the grooves of a walkway surface. Between the flanges is a brake disk which can rotate around the spindle. Fixed to an edge of the brake disk is a brake skid having a sole. An end piece, which extends into a cup formed by the yoke, is fixed to another portion of the brake disk. When the castor moves onto a grooved surface, the periphery of the flanges are engaged in the groove and the brake skid comes into contact with the ribs of the grooved walkway. This causes the brake disk to rotate slightly around the spindle until the end piece abuts the inside wall of the cup, thus immobilizing the trolley.