| 摘要 |
The device comprises an arm (30) consisting of a number of consecutive segments (3a,3b,3c), fixed with one of its ends, to a first pivot (2) protruding from a structure (1) and made revolving so to bring about the oscillation of the arm (30) in opposed senses (A,B), and with a member (4) supported in revolving mount by a second pivot (16) fastened to the free end of the support (30), having its lower part extending circumferentially and provided with a toothing (6) which engages with a worm screw (7) supported by the support (30) and dragged to rotation by a number of shafts (11,13), bevel gear pairs (10,12), supported by the arm (30) and with their terminal end suited to couple with a sector of crown gear (15) fastened to the structure (1) and concentrical as to the first pivot (2), so that, following the rotation of the first pivot (2) in either sense (A, B) the member is subjected to a rotation having the same angular amplitude and opposite direction. |
