| 摘要 |
<p>The subject of the invention is an actuator for gates, doors and the like, with at least one wing. The actuating motor (14) and the associated motor reduction unit (15) are housed inside as half arm (2) which turns on a fixed support (9) in an oscillating way about a substantially vertical swinging axis (10). Advantageously, the electric motor (14) operates a manoeuvering worm screw (12) which is carried by said half arm (2) and engages a corresponding helical gear (13) coaxial with the swinging axis (10) and is fastened to the fixed support of the half arm (2) by means of a torque limiting device which prevents excessive stresses on the actuator as a result of external forces and also makes it possible to release the helical gear for manual emergency actuation of the wing.</p> |
