| 摘要 |
1,142,368. Gear-cutting. NATIONAL BROACH & MACHINE CO. 26 Aug., 1966 [13 Sept., 1965], No. 38325/66. Heading B3L. An annular broaching member comprises internal helical cutting teeth 26 and an external helical slot 28 of the same lead to locate the member in a holder ( 10) . The holder comprises two half-shells screwed together and a series of conically-ended pins 32 to engage the slots 28. |
