| 摘要 |
1,205,440. Expanding mandrels. VULKANWERK WILHELM DIEBOLD (OHG). 2 Nov., 1967 [10 Nov., 1966], No. 49925/67. Heading B3B. An expanding mandrel comprises radially displaceable members 1 which are displaced by an axially movable cone 2, the movement of which is controlled by a hand wheel 6 journalled for rotation about the mandrel axis, and which houses pin members 8 which co-operate with cam surfaces on a cam member 3, attached to the cone 2, the rotation of the hand wheel between predetermined limits effecting axial movement of the cone 2 to actuate the members 1 to engage a workpiece 20. At least two cam surfaces are provided which are equally spaced around the mandrel axis. In the embodiment shown in Figs. 1 and 2, the number of cams correspond to the number of displaceable members, and each cam surface is constituted by two distinct but consecutive angled portions 4 and 5. The displaceable members are retained in contact with the cone by annular coil springs 19 or by coil springs which engage transverse extensions (7) of the members 1, Fig. 3 (not shown). In a further embodiment, a spring- biased lever actuated stop member is provided for locating successive workpieces on the mandrel and which moves parallel to the mandrel axis with the movement of the cone member. |
