| 摘要 |
A latch assembly for use with a panic exit device, particularly a top latch having a U-shape which engages a stem portion of a T-shaped receiving lug mounted overhead to a top member of the door frame. The U-shaped top latch is pivotably mounted to the active stile of the door. The latch assembly causes the U-shaped latch to pivot upward to capture the stationary T-shaped receiving lug, or pivot downwardly to disengage from the T-shaped receiving lug. The latch member is in sliding and abutting engagement with a latch cam which pivots in one direction to retain the latch member in an upward orientation to capture the T-shaped receiving lug, and pivots in an opposite direction to allow the latch member to pivot downwardly upon opening pressure on the door and actuation of the panic exit device, to release the latch member from the receiving lug. The latch cam is activated by movement of a panic bar of a panic exit device mounted onto the door, and the latch cam, once moved to disengage the latch member from the receiving lug, holds the latch member in a condition for automatic re-engagement with the receiving lug once the door re-closes.
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