| 摘要 |
1,103,677. Screw-and-nut gearing. COMMISSARIAT A L'ENERGIE ATOMIQUE. 18 Nov., 1966 [3 Dec., 1965], No. 51829/66. Heading F2Q. [Also in Division B8] A device for the accurate positional adjustment of a component 5 comprises a control rod 6 provided with two screw-threads 10, 12 of different pitch, one screw-thread 10 being engaged with a first nut 2 secured against both rotational and translational motion by pivotpins 14 in a stationary bracket 1 whilst the other screw-thread 12 is engaged with a second nut 8 secured against rotational motion alone by pivots 28 in an elbowed lever 26 itself pivoted at 27 in the bracket 1. The rod 6 is coupled to a motor 4 (preferably electric) provided with a guide-tube 22 with slots 24 to enable the tube 22 to slide over the nut 2 on ball-bearings 23 to prevent rotation of the motor 4 as a whole. Rotation of the rod 6 by the motor 4 causes the nut 8 to move a distance corresponding to the algebraic sum of the displacement of the rod 6 and of the nut 8 along the rod 6. As shown, this movement may be applied to the component 5 through the lever 26 by a cable 32 articulated at 34 or alternatively the component 5 may be connected directly to the nut 8. |
