| 摘要 |
The device comprises four angled arms (1,2,3,4) located radially around the wheel and encompassing the tread (5) of the tyre (6). The arms are fixed to slide on a central support (7). The arms are mounted in opposition in pairs and slide pair by pair, in superposition, in an identical housing (11,12) in the central support. The central support is constituted by two tubular hollow orthogonal parts (13,14) fixed together in which the pairs of opposite arms slide. Connection between the tubular parts is ensured by a bolt and the orthogonal working position of the parts is ensured by two stops fixed to one of the parts and placed each side of the part centre at a distance enabling the housing of the other part.
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