| 摘要 |
1,200,478. Ring traveller. W. REINERS and S. FURST [trading as REINERS & FURST]. 6 Dec., 1967 [21 Dec., 1966], No. 55466/67. Heading D1D. A ring traveller is produced by taking a shape 1 of plastics material formed in a known manner e.g. by injection moulding or casting and inserted a rod 1a to form means to resist the thread wear. The rod may be inserted in a bore formed in the plastics material or it may be pressed in, nail-like or it may be provided with a screw thread and screwed in. As shown the rod may have different diameter positions, which are joined by an intermediate surface arranged to match the associated shape of the plastics material. The rod is preferably introduced into a surface of the plastics material at right angles to the surface. The rod may made of steel and be chromium plated, polished or delustered; alternatively the rod may be of sintered ceramics. |
