Patent attributes
A fire door lock includes a base assembly including first and second slide blocks, a locking control assembly including a movable seat forming a groove and a tongue control plate movably mounted to one side of the locking control assembly, and a winglet assembly including first and second winglets both having a boss movably received in the groove of the movable seat and both being respectively and rotatably coupled to the first and second slide blocks. Thus, when the movable seat is driven by a handle, the movable seat moves the first and second slide blocks to withdraw first and second latch bars to unlock the fire door and when the fire door is closed, the tongue control plate is actuated to allow the movable seat to return to the locked condition and the first and second latches and a tongue are stretched out to realize three-directional locking.
