| 摘要 |
<p>PURPOSE:To enable to thin a cylindrical part and to obtain a light rotary head cylinder having a high precision by constituting the cylinder in order to obtain a sufficient strength for external force which is given at the time of working, etc. CONSTITUTION:A first cylindrical part 2 which forms a cylindrical outer periphery, a second cylindrical part 3 having a diameter shorter than the first cylindrical part, which is concentric with the first cylindrical part, a first bottom part 4 formed between one end part of the first cylindrical part 2 and the second cylindrical part 3, a second bottom part 5 formed on another end part of the second cylindrical part 3 and a rib which is from the first cylindrical part 2 to the second cylindrical part 3 on the first bottom part 4 are provided in the titled cylinder. Thus, it is unnecessary to equally thicken the whole thickness in order to secure a working precision, so that the sufficient strength for the external force which is given by a chuck 10 at the time of working, etc., with a simple constitution can be obtained. Especially since it is possible to thin the cylindrical part, it can be remarkably enhanced to make a device light.</p> |
