| 摘要 |
1,032,207. Producing locking nuts. NUTS & BOLTS (DARLASTON) Ltd. Feb. 22, 1965 [Feb. 28, 1964], No. 42977/63. Heading B3A. [Also in Division F2] An insert 16 is positioned within a groove 11 in the threaded bore 13 of a self-locking nut, for example, by means of opposed cylindrical dies 13 and 14 which are forced together. The insert 16, suitably of nylon which can be heated if desired, is forced into the annular groove and retained there. The nut is subsequently mounted on a spring support 21 (Fig. 3, not shown), a circular die 23 forcing the nut downwardly over a cutting die 17 to remove the centre section of the insert. In place of a single groove, a number of discontinuous grooves may be provided, and the threads in the nut on opposite sides of the groove or grooves may be slightly misaligned.
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