| 摘要 |
A joint for interconnecting confronting end portions of two elongate members so that the elongate members are movable between first and second positions. In the first position, the elongate members are releasably locked in a coaxial, erect supporting position in which confronting end portions of the members are closely spaced from each other. In the second position, the elongate members are spaced from and substantially parallel to each other. The hinge includes a central block member having a generally U-shaped profile, with guide surfaces and cam slots in its flanges. Guide members having similarly shaped guide surfaces and cam slots are connected in pairs to opposite ends of the block member and cooperate with the guide surfaces and cam slots to control movement of the tubular members between the first and second positions.
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