| 摘要 |
<p>The support has a frame (1) on rollers (12) part (4) of which forms a platform to fit under the door when open and on its hinges. The frame has a beam (6,7) to lift the door. Parts (13,14) on the frame can adjust its height from the ground. The lifting is by a vertically movable plate (6), worked by a pedal lever (7). The frame is trough shaped and has a hole (5) in its base to surround the movable plate. The plate is of angle iron, and guided on an inner face by a troughed side wall.</p> |
