| 摘要 |
<p>A manoeuvrable body arranged for rotation about a fixed pivotal axis wherein rotation of the body about the pivot is achieved by means of an actuator cam arrangement positioned on an underside of the body, the arrangement comprising; enclosed in a single casing (2), a leadscrew (11) arranged to be rotated about its axis by an actuator; a rack nut (1) threadingly engaged with the leadscrew (11) and arranged such that rotation of the leadscrew (11) drives the rack nut (1) longitudinally with respect to the leadscrew (11); a toothed section (12) radially distanced from the leadscrew and integral with or coupled to the rack nut (1) for longitudinal movement with the rack nut (1); the toothed section (12) arranged to mesh with a first rotatably mounted gear (9) such that the longitudinal movement of the toothed section (12) causes rotation of the first gear (9), a second gear (4) coupled to the first gear (9) and rotationally statically fixed about a shaft (3) whereby when the leadscrew (11) is rotated, the rack nut (1) travels linearly along the leadscrew (11) which in turn drives the first gear (9) to rotate and travel around the second gear (4) thereby to rotate the casing (2) in its entirety about the shaft (3).</p> |
