| 摘要 |
The present device is a collapsible A-frame sign that can be converted into a panel that is capable of interlocking with other panels to form a physical barricade. When used alone, the device works similar to conventional A-frame sign or barrier by folding two frames hinged around a common end at the top of frames to form an A-shape allowing it to be erected in an upright position. Additionally, the device can be locked into a 180-degree angle, and joined with other identical devices to form a barricade at a height twice of the length of single frame. As a result, a group of locked devices can be used as a barricade as well as a warning signs.
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