| 摘要 |
PCT No. PCT/GB90/00167 Sec. 371 Date Aug. 9, 1991 Sec. 102(e) Date Aug. 9, 1991 PCT Filed Feb. 2, 1990 PCT Pub. No. WO90/09544 PCT Pub. Date Aug. 23, 1990.A control device for a tiltable mounting head, such as the mounting head for a camera, has a three element pantographic linkage including a rigid control arm of which an intermediate point is constrained to move along a horizontal path. One end of the arm is pivotally mounted to an arm carrying the tiltable head, while the other end is pivotally mounted to a locating arm whose remote end is pivoted to fixed structure. The relative angular position of the two arms is controlled by two parallelogram linkages with different degrees of fold and having the central arm in common, whereby one of the two linkages is always laterally spaced from the arm. Alternatively the two arms may be secured to respective sprockets pivoted to the arm and connected together by a chain. |
