| 摘要 |
A tire changing machine which comprises: a bed (1), a frustoconical platform (3) which is supported by the bed and is designed to act as a support for a wheel rim, a hollow shaft (14) which is coaxial to, and rotates rigidly with, the frustoconical platform (3) and raises from said platform and is provided with a threaded portion, a fixed shaft (4) which is arranged within said hollow shaft and protrudes therefrom, securing means scewable onto the hollow shaft (14) for fixing the wheel rim on the platform, a lateral column (30) raising from the said bed, upper bead breaking means (32,33) carried by the said column and arranged to act from above on a tire on a wheel rim located on the frustoconical platform, lower bead breaking means (59,60) arranged to act from below on the lower side of a tire on a whell rim placed on the platform, a driving motor (12) for rotating the said frustoconical platform about the said hollow shaft, and automatic locking and releasing means between the said driving motor and said platform to safely clamp the platform against a wheel rim placed thereon. <IMAGE>
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