| 摘要 |
1,254,218. Rolling threads. RUSSELL, BURDSALL & WARD BOLT & NUT CO. 28 Feb., 1969 [7 Oct., 1968], No. 10999/69. Addition to 1,169,842. Heading B3M. [Also in Division F2] A screw thread is rolled in a manner similar to that described in the parent Specification, but the insert 156 which forms the offset locking segments 124a-124e and 125b-125e on the screw 120 has the groove formation illustrated in cross-section on the left-hand side of Fig. 10. The insert forms pairs of locking segments, such as 124b, 125b, which are offset towards each other.
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