Lock hold-back latch

Claim 1

IN A LOCKING MECHANISM FOR A DOOR, THE COMBINATION COMPRISING: A CASING STRUCTURE; A LATCH BOLT MOVABLE IN THE CASING STRUCTURE BETWEEN RETRACTED AND EXTENDED POSITIONS; A LOCKING MEMBER; MEANS JOURNALING THE LOCKING MEMBER ON THE BOLT FOR ROCKING MOVEMENT; SAID LOCKING MEMBER HAVING A FIRST ARM EXTENDING IN ONE DIRECTION AND A SECOND ARM EXTENDING IN ANOTHER DIRECTION OUTWARDLY FROM THE JOURNALING MEANS; AN ACTUATOR BOLT MOVABLE IN THE CASING STRUCTURE BETWEEN RETRACTED AND EXTENDED POSITIONS; MEANS FOR BIASING THE ACTUATOR BOLT AND THE LATCH BOLT TOWARD THEIR EXTENDED POSITIONS; SAID ACTUATOR BOLT HAVING A PROJECTION THEREON; SAID FIRST ARM EXTENDING IN POSITION TO BE ENGAGED BY THE PROJECTION ON THE ACTUATOR BOLT; GUIDE MEANS ON THE CASING STRUCTURE FOR ENGAGING A PORTION OF THE SECOND ARM FOR DEADLOCKING SAID SECOND ARM WHEN THE LATCH BOLT IS IN ITS EXTENDED POSITION; MEANS FOR BIASING SAID SECOND ARM INTO DEADLOCKED POSITION; AND KEY CONTROLLED MEANS FOR ENGAGING A PORTION OF SAID LOCKING MEMBER TO MOVE SAID SECOND ARM OUT OF DEADLOCKING POSITION AND TO RETRACT SAID LATCH BOLT.