Patent ID: 7096905

Claim:
A slip-preventing device comprising: two or more arm frames; and link units linking the arm frames with each other, each of the arm frames including, a pair of outer side components each of which has an elongate shape extending along an inner circumferential edge of an outer sidewall of a tire, the pair of the outer side components being arranged apart from each other at a fixed interval in a circumferential direction of the sidewall of the tire; a pair of crossing components each of which has essentially a channel shape extending from a base end of each of the outer side components to the outer sidewall, a tread and an inner sidewall of the tire; and an inner side component connecting leading ends of the pair of the crossing component and having an elongate shape extending along an inner circumferential edge of the inner sidewall of the tire; wherein leading ends of the outer side components of the arm frames are linked and coupled in one body by the link units, respectively, so as to dispose the crossing components at fixed intervals along a circumferential direction of the tread of the tire, and each of the arm frames further includes free joint units at a connecting portion between a base end of the outer side component and the crossing component and a connecting portion between the leading end of the crossing component and the inner side component, respectively; the free joint unit is formed by cutting apart the connecting portion so as to define a first portion and a second portion and linking the first portion and the second portion with each other so as to relatively rotate along a planar direction of a side surface of the tire; and the outer side component and the crossing component are capable of relatively rotating along the planar direction of the side surface of the tire via the free joint unit, while the crossing component and the inner side component being capable of relatively rotating along the planar direction of the side surface of the tire via the free joint unit.