| 摘要 |
In one embodiment, a frame has a first expanded configuration, a second expanded configuration and a collapsed configuration. The frame includes a support member, a first elongate member, a second elongate member and a coupling member. A first end portion of the first elongate member is pivotally coupled to the support member. A first end portion of the second elongate member is pivotally coupled to the support member. The coupling member is coupled to a second end portion of the second elongate member. A second end portion of the first elongate member is coupled to the coupling at a first location of the coupling member when the frame is in its first expanded configuration. The second end portion of the first elongate member is coupled to the coupling member at a second location of the coupling member when the frame is in its second expanded configuration.
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