Abstract of the DisclosureAn automatically locking crossbolt deadlock.Deadlock includes a vertically movable crossbolt which maybe moved between locked and unlocked positions. A lockbutton is movable between a first position in which the lockbutton positively holds crossbolt in its locked position anda second position in which crossbolt is free to move. Adrive lever is provided for moving crossbolt between itslocked and unlocked positions. Lock button is moved fromits first to its second position upon rotation of a handleso that a panic exit may be accomplished without manuallyunlocking lock button. In addition, lock button is movableto a third position for holding crossbolt in its unlockedposition to provide an anti-lock out feature.
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