| 摘要 |
<p>A wavy expansion gate comprises many group of frameworks (10), top horizontal beams (21), bottom horizontal beams (22) and wheels (30), wherein, the frameworks (10) are hinged between top horizontal beams (21) and bottom horizontal beams (22) respectively with an end-to-end relation between the up ends and bottom ends of the frameworks (10), each group of frameworks (10) comprises a separate interior frame (11) and an exterior frame (12), the up ends and bottom ends of the interior frame (11) and the exterior frame (12) are hinged between the top horizontal beam(21) and the bottom horizontal beam(22) with hinges (40), at least two wheels (30) are mounted on the underside of each bottom horizontal beam (22).</p> |
