| 摘要 |
A collapsible framework (10) constructed of rods (12,14) pivotally joined at their ends to hubs (18) to form a self-standing unit when expanded and to fold into a small set of nearly parallel rods when folded. The hubs (18) are designed to pivotally join the ends of four rods (12,14), with the plane defined by the pivot axes of one pair of opposing rods being offset from the plane defined by the pivot axes of the other pair of opposed rods attached to the same hub (18). A stab-connection latch (40,42) locks two hubs together and secures the framework in the expanded position. Folding channel bars (80,82,84) are attached to knobs (64) on vertically aligned hubs by key-slots (100-106), the key-slots of one channel bar being of progressively shorter length going from the top-most to the bottom-most of the vertically aligned hubs to which the bar is attached. |
