Preti, Lisa

An electromechanical rotating actuator (4) which, installed at the end of the arm (2) of an aerial platform, supports and orients the basket (3), allowing the operator to perform their activity at a height. The rotary motion to orient said basket is imparted on the central shaft (5) and on the flange (16) solidly constrained to it, at the correct speed, magnitude of rotation and appropriate torque, by an electric motor by means of a harmonic gear reducer coaxial with said motor and with the central shaft (5), all enclosed and protected inside a cylindrical casing (15) of limited dimensions in both diameter and length and with the possibility of adapting and registering the magnitude of the rotation arc without exceeding 360° in any case.

The slewing mechanism in a lightweight version is obtained by adopting a lightweight, high-strength alloy as the material for the inner ring and toothed worm gear, while the ability to withstand axial loads and tipping moment is ensured by a radial sliding bearing and two axial sliding centre plates that replace the traditional four-contact row of balls used until now in versions with a steel ring and worm gear.The transmission of rotation motion occurs through the meshing between a steel worm screw, driven by an electric or hydraulic motor, and a helical worm gear made of light alloy whose teeth have special wearproof anodising treatment; the closed housing, provided with suitable sealing systems, ensures oil bath lubrication of both the meshing and the bearings.