| 摘要 |
Load-bearing swinging arm (1) causing an advance movement of a mobile device by means of its pivoting movement is pivotally connected to another construction (2) in a pivotal relationship thereto about an axis of rotation (A), whereby an actuator (3) for effecting said pivoting movement is provided between the arm (1) and the construction (2) at the pivot. The points of action (3a, 3b) acting on the construction (2) by way of the actuator are provided on both sides of the axis of rotation (A). The points of action (3a, 3b) are provided for effecting a moment simultaneously about the axis of rotation (A), and they will also effect a force couple at least in some position e.g. in a position critical in view of the load, the forces acting through the points of action being parallel, of equal magnitude and having opposite senses in said couple. |
