| 摘要 |
A revolving door has a plurality of leaves mounted for rotation about a common axis. To permit collapse of the door in an emergency, the leaves are mounted, at each end, by means of mechanisms that permit such collapse. There is provided a mechanism for mounting one end of a door leaf, the mechanism having a support plate for rotation about the central axis. First and second pivot means are mounted on the support plate, and corresponding first and second pivot devices are mounted on the door leaf. The pivot means and devices, e.g. corresponding projections and recesses, are such that, the door leaf can pivot about one pair of pivot device and means, while the other pair of pivot device and means separate from one another. Once rotation has commenced about one pair of pivot device and means, they are such that they cannot then be separated, thus securing the door. Biasing means acts on the door leaf to normally maintain the first and second pivot devices in engagement, and thus to maintain the leaf in a normal extended position. A latch mechanism is also provided, for use in the biasing means, which automatically locks a latch member when the door leaf is in its normal position. The latch mechanism can be used with a variety of pivot arrangements.
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