| 摘要 |
A movable platform assembly (1) comprises a base portion (2), able to be fixed to a support structure, and at least one pivotable arm (32a, 32b) hinged at one end with the base portion (2), about a first hinging axis (xl), and at the other end with a loading platform (3), about a second hinging axis (x2), the pivotable arm (32a, 32b) being able to be rotated by means of actuating devices (50, 60, Ul, U2, Sl, S2, S3), which are designed to allow the platform (3) to maintain a constant inclination with respect to the base portion (2) during rotation of the pivotable arm (32a, 32b). The actuating devices comprise a first and a second rotary actuator mounted on the first and second hinging axis, respectively. The first rotary actuator (50) comprises a first part (51) fastened to the base portion (2) and a second part (52) rotatable with respect to the first part (51) and fastened to the pivotable arm (32a, 32b), and the second rotary actuator (60) comprising a first part (61) fastened to the loading platform (3) and a second part (62) rotatable with respect to the first part (61) and fastened to the pivotable arm (32a, 32b), said actuating devices also comprising control devices (Ul, U2, Sl, S2, S3) able to control in a co-ordinated manner rotation of said first and second rotary actuators. |
