| 摘要 |
An expandable shaft for mounting of a hollow core having an internal surface including an elongated polygonal base member having an axis of rotation, outer surfaces on the member defining a circumference having a diameter which is slightly less than the diameter of the internal surface of a core which is to be mounted on the expandable shaft, a selectively inflatable elongated expandable bladder extending longitudinally on the elongated base member in circumferentially spaced relationship to the outer surfaces for engaging the inside surface of the core and drawing it into engagement with the plurality of surfaces when the elongated expandable bladder is inflated.
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