High security panic exit system

A combined panic exit and exterior access lock assembly for a security area door including a door latching panic exit device and an exterior access lock intercoupled therewith within operation of a panic bar from within the security area concurrently retracts both the latch bolt means of the panic exit device and lock bolt means of the exterior access lock for egress from the security area through an associated door while retraction of the latch bolt means of the lock bolt means from outside the door requires independent unlocking operation of both the panic exit device and exterior access lock, retraction of either the latch bolt means or the lock bolt means from outside being ineffective to retract the other bolt means;

• comprising a panic exit device housing to be fixed on the door against an inside surface of the door, an elongated push plate forming said panic bar movable outwardly and inwardly relative to the door surface, a primary latch bolt extendable from said exit device, actuator means for the latch bolt including a main control link and a primary latch output operatively coupled therewith for retracting and projecting the primary latch bolt and a rod member movable to retract the primary latch bolt, secondary output means including a secondary output member, at least one pivoted bellcrank having an arm pivotally connected to said secondary output member to move the latter to retracted position coordinately with the primary latch bolt;
• an exterior access lock having means operable to retract and project a secondary bolt and an associated primary lock bolt when the exterior access lock has been properly operated to unlock the same, a rotatable member to retract the primary lock bolt, and linking means coupling the rotatable member with said secondary output to activate the associated bellcrank to retract the secondary latch bolt;
• and an elongated coupling link substantially paralleling and located closely adjacent to the inside door surface having a first end occupying between said coupling link and said rod member and a second end coupling between said coupling link and said bellcrank, said coupling link and associated first and second end couplings including a lost motion intercoupling including means for transferring retracting movement to said secondary output from the rod member without relative lost motion to achieve concurrent retracting movement of the primary latch bolt and the primary lock bolt and for accommodating relative lost motion movement of the secondary output relative to the rod member upon retraction of the secondary output and associated primary lock bolt whereby unlocking of the exterior access lock retracts said primary lock bolt and secondary output linked thereto through said rotatable member without retracting said primary latch bolt.