| 摘要 |
A support for an object of appreciable weight (eg for a CRT display) comprises a mount 10 which, in use is located at a reference height. A crank 20 extends from this mount. A boom 12 is pivotally mounted on the mount and extends therefrom to and carries means (not shown) for attaching the intended object which is to be located at an adjustable height with respect to the reference height. A lift lever 26 and a gas strut 30 are carried wholly by the boom. A lift rod 36 is mounted between a position on the crank remote from the mount/boom axis 18 and the lift lever, the latter being pivotally mounted in the boom. The lift rod and the gas strut are connected to the lift lever. The gas strut engages the boom and counteracts the effects of gravity on the loaded support. The lift lever is arranged to rotate about an axis 28 which is substantially orthogonal to the mount/boom axis and is fixed relative to the boom. Alternatively, or in addition, the lift rod and the gas strut are arranged to be connected to the lift lever with the strut at a greater separation from the lever's pivot than the rod. In addition to the lift mechanism the support can also incorporate a parallel motion and a tilt mechanism. |
