| 摘要 |
A bobbin holder for receiving and securing a conical or cylindrical tube is provided with a support tube, a conical clamping ring axially movably mounted on the support tube, and a pair of spreading levers each having a free end and being pivoted for movement toward or away from each other in a plane which includes the axis of the support tube. The clamping ring and the spreading levers are spaced from each other in the axial direction of the support tube. The pivots of the levers are closer than the free ends of the levers to the clamping ring. The position of the clamping ring closest to the pivots of the spreading levers is the smallest diameter portion. The clamping ring and the spreading levers are, accordingly, adapted to engage the respective ends of the conical or cylindrical tube and thus secure the conical or cylindrical tube.
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