| 摘要 |
Novelty: a differential screw-turning mechanism is disclosed. Constitution: two angular gears having peripheral teeth (2,3), one angular gear (4), two cylinders (5,6) united in T shape, two metal securing means (7,8), two springs (9,10), four rolling bearings (11,12,13,14), one conical rolling bearing (15), one plug (16) wherein the screw head is adapted and a head (17) whereon said mechanism is held. Said head (17) is adhered to the handle (1) the movement of which causes the operation of the mechanism. The characteristic of said mechanism is that the gear (4) turns to a precise direction defined by the user and independently from the direction of the handle΄s movement. Advantage: savings in work, movements and time. |
