| 摘要 |
1,167,669. Rolling screw-threads. HARTFORD SPECIAL MACHINERY CO. 29 April, 1968 [4 March, 1968], No. 20222/68. Heading B3M. [Also in Division B8] Work blanks 20 slide down track 22 and are discharged sideways at the bottom thereof to a threading machine by pusher 48. The presentation of the blank to pusher 48 is assisted by three air jets 52 54, 56 the strength of which can be varied to suit the length of the blanks on which they impinge. |
