| 摘要 |
A vertical leg (14) is received through a ring (16). An over-center latch mechanism is mounted inside a cavity (6) in a side rail (2). The end surface (2a) of the rail (2) has a recess (4). A shaft (24) has one end (26) secured to the ring (16) and extends from the ring (16) through an opening (8) in the rail (2) which communicates the recess (4) and the cavity (6). The inner end (28) of the shaft (24) is engaged by a lever (32) of the latch mechanism. Pivoting of the lever (32) pulls the ring (16) into the recess (4) and the leg (14) into contact with the end surface (2a) of the rail (2) above and below the recess (4). There is no contact between the ring (16) and any portion of the rail (2) to allow automatic adjustment for surface irregularities of the rail (2) and leg (14) and ensure firm contact between the leg (14) and rail (2). Preferably, the end (26) of the shaft (24) is pivotable relative to the ring (16). In an alternative embodiment, a latch mechanism housing (33) is mounted on the outside side surface (2b') of the rail (2') and the recess (4', 5) is formed in the rail (2') and the housing (33). In either embodiment, two rails (2, 2') may be attached to a ring (16'') to form a corner joint.
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