Patent ID: 9205885
Filing Date: 2015-12-08
Classification: B60C,B60F,B62D,Y10S

Abstract:
1. A crawler device comprising: a wheel support extending in a front-rear direction; wheels respectively rotatably supported at a front portion and a rear portion of the wheel support; and a crawler belt made of an endless elastic material, the crawler belt run around the wheels at the front and rear portions of the wheel support; wherein each of the wheels comprises a rigid wheel body and an exterior part made of an elastic material, the exterior part fixed to an outer periphery of the wheel body; the exterior part comprises a base portion and raised portions, the base portion fixed to the outer periphery of the wheel body, the raised portions formed in an outer periphery of the base portion such that the raised portions continuously extend in a width direction and are arranged in a circumferential direction spaced from each other; drain grooves extending through the exterior part in the width direction are formed between the raised portions; top surfaces of the raised portions of the exterior part of the wheel having a surface-to-surface contact with an inner peripheral surface of the crawler belt with a frictional force working therebetween; restriction projections are provided in opposite side edges of the crawler belt over an entire circumference of the crawler belt to restrict the crawler belt from being displaced with respect to the wheels in the width direction, the restriction projections protruded from the inner peripheral surface of the crawler belt, the restriction projections stopped by opposite side surfaces of the exterior part; and, a height of the restriction projections of the crawler belt protruded from an inner periphery of the crawler belt is smaller than a height of the raised portions of the exterior part protruded from the outer periphery of the base portion, causing the restriction projections to only partially cover openings at opposite ends of the drain grooves, thereby allowing the drain grooves to communicate with outside through opposite end openings thereof.