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1. (WO2018087901) CASTER STRUCTURE

Pub. No.:    WO/2018/087901    International Application No.:    PCT/JP2016/083612
Publication Date: Fri May 18 01:59:59 CEST 2018 International Filing Date: Sat Nov 12 00:59:59 CET 2016
IPC: B60B 33/00
Applicants: NANSIN CO., LTD.
Inventors: YAMAMOTO, Takahiro
山本 貴広
[Problem] To provide a caster structure including a sign groove for indicating the tire replacement period of a caster that is equipped with a wheel that is subjected to braking using a brake shoe. [Solution] Provided is a caster structure in which a mark groove is provided in a tire of a wheel of a caster in which the rotation of the wheel is braked by pressing the tire with a brake shoe. The caster structure is characterized: in that a mark groove, a groove bottom part of which is set to a prescribed depth, is provided in an annular shape in an outer circumferential surface of the tire along an outer circumference of the tire; and in that a plurality of warning protrusions, which connect left and right side walls that form the groove and each have an upper surface that closes the groove, are provided inside the mark groove at a prescribed interval along a direction in which the mark groove extends, at a position of intermediate depth between the groove bottom part and a groove opening part.