| 摘要 |
1,057,518. Screw-and-nut gearing. A. M. MAKOTH. Dec. 13, 1965 [Oct. 18, 1965], No. 52876/65. Addition to 1,047,575. Heading F2Q. A screw-and-nut mechanism comprises a threaded shaft 10 surrounded by an inner sleeve 11 carrying projections 12 engaging the thread, and at least one outer sleeve 15 surrounding the inner sleeve and carrying projections 18 engaging a screw-thread on the outer surface of sleeve 11 and of greater pitch than the thread on shaft 10, the projections 12, 18 being in the form of radial rollers mounted in anti-friction bearings as described in the parent Specification. As shown, sleeve 11 is provided with threads 13, 14 of opposite hand, and three outer sleeves 15, 16, 17 are provided, the end sleeves 15, 17 carrying projections 18 engaging the threads 13 and the middle sleeve 16 carrying projections 19 engaging the opposite-handed threads 14, so that the axial movement of sleeve 11 resulting from rotation of shaft 10 causes rotation of sleeve 16 in a direction opposite to that of sleeves 15, 17. As applied to an actuator, Figs. 2 and 3 (not shown), shaft 10 and sleeve 11 are enclosed in cylindrical housings (23, 24) and end flanges (25, 26) are provided on the outer sleeves. |
