Delayed egress exit device

摘要

A touch bar ( 24 ) exit device ( 20 ) comprises a retractor element ( 50 ) disposed in the housing ( 22 ) for substantially restilinear movement. The retractor element ( 50 ) connects the touch bar ( 24 ) and the latch bolt ( 82 ) such that the retractor element ( 50 ) and the latch bolt ( 82 ) are moved toward the retracted position in response to movement of the touch bar ( 24 ). An electrically energizable locking mechanism ( 104 ) in the exit device ( 20 ) includes a reciprocating plunger ( 106 ) moving transverse to the retractor element ( 50 ). When energized, the locking mechanism ( 104 ) is operative to move the plunger ( 106 ) to the projected locking position to prevent retraction of the latch bolt. A time delay circuit is connected to the locking mechanism ( 104 ). A switch ( 120 ) actuated in response to movement of the touch bar ( 24 ) is connected to the time delay circuit for starting a predetermined time interval for temporarily delaying deenergization of the locking mechanism ( 104 ). When the time delay circuit interrupts power to the locking mechanism ( 104 ), the plunger ( 106 ) moves allowing the latch bolt ( 82 ) to move to the retracted position.