| 摘要 |
<p>The automatic or semi-automatic lift has two separate sections formed by metallic bars fixed by linkages to a bar with washers and rollers for movement of the lift. The lift has one or more gas actuated scissors linkages and rack and pinion, pedal or other drives for moving the frame section supporting the panel. The drive allows the user to lift the panel by foot pressure on a control on the automatic version or to lift it a set amount in the semi-automatic version, for full lifting of the sign panel.</p> |
