Door control system

Claim 1

IN A BUILDING STRUCTURE, THE COMBINATION COMPRISING: A BUILDING WALL HAVING A FIRST OPENING THEREIN; A DOOR HINGEDLY MOUNTED IN SAID OPENING AND SWINGABLE BETWEEN AN OPEN POSITION AND A CLOSED POSITION CLOSING SAID OPENING; A STOP ON SAID WALL, SAID STOP PERMITTING SAID DOOR TO SWING IN ONE DIRECTION ONLY FROM ITS CLOSED POSITION; A KNOB OPERATED LATCH AT THE SWINGING EDGE OF SAID DOOR; AN ELECTRICALLY OPERABLE STRIKE IN SAID WALL AT THE EDGE OF SAID OPENING, SAID LATCH BEING NORMALLY RECEIVED IN AND STRIKE AND ENGAGED THEREBY, PREVENTING SAID DOOR FROM OPENING; A FIRST KEY OPERATED LOCK CONNECTED BETWEEN SAID LATCH AND SAID KNOB AND HAVING A KEY-SLOT THEREIN AND OPERABLE WHEN LOCKED TO PREVENT UNLATCHING OF SAID DOOR BY SAID KNOB, SAID FIRST LOCK BEING OPERABLE TO AN UNLOCKED CONDITION BY A FIRST KEY TO ENABLE UNLATCHING OF SAID DOOR BY OPERATION OF SAID KNOB; SOLENOID MEANS IN SAID STRIKE AND OPERABLE, WHEN ENERGIZED, THE DISENGAGE SAID LATCH AND RELEASE SAID DOOR TO SWING OPEN; A RECEPTACLE IN SAID WALL; A SECOND KEY OPERATED LOCK IN SAID RECEPTACLE AND HAVING A KEY-SLOT THEREIN FACING OUTWARDLY FROM SAID WALL IN THE SAME DIRECTION AS THE KEY-SLOT IN SAID FIRST LOCK; A DEADBOLT IN SAID SECOND LOCK; A SOURCE OF ELECTRICAL ENERGY; A FIRST NORMALLY-OPEN ELECTRICAL SWITCH IN A CIRCUIT WITH SAID SOURCE AND SAID SOLENOID MEANS, SAID SWITCH BEING NORMALLY HELD OPEN BY SAID DEADBOLT, SAID SECOND LOCK BEING OPERABLE TO UNLOCKED CONDITION BY A SECOND KEY INOPERATIVE IN SAID FIRST LOCK, SAID SECOND LOCK, WHEN OPERATED TO AN UNLOCKED CONDITION MOVING SAID DEADBOLT TO A SECOND POSITION ENABLING CLOSURE OF SAID FIRST SWITCH, SAID FIRST SWITCH THEREUPON CLOSING TO MAKE SAID CIRCUIT AND ENERGIZE SAID SOLENOID MEANS TO RELEASE SAID DOOR TO SWING OPEN; A SECOND NORMALLY-OPEN SWITCH CONNECTED IN PARALLEL WITH SAID FIRST SWITCH, SAID SECOND SWITCH HAVING OPERATING MEANS INSIDE THE BUILDING STRUCTURE, AND SAID KEY-SLOT OPENING ON THE OUTSIDE OF SAID BUILDING, SAID FIRST KEY BEING INOPERATIVE IN SAID SECOND LOCK, AND SAID SECOND LOCK BEING SECURED IN SAID BUILDING WALL AND OPERABLE ONLY BY A KEY INSERTED IN THE KEYSLOT THEREOF AND ONLY FROM OUTSIDE THE BUILDING.