| 摘要 |
A device comprising two plates (1, 2) arranged one above the other and joined together via length-adjustable electrically controlled actuators (3, 4) and an upright having a constant length and forming the apices of triangles on said plates. The actuators and the upright are rigidly connected to one of the plates (1), i.e. the lower plate, and connected to the other or upper plate (2) via a hinge assembly which includes a gimbal joint and a pivot shaft (62), each pivot shaft (62) being parallel to the opposite side (7) of the triangle defined on said plate. |
