Manually operated electrically interlocked door lock keeper

Claim 1

A MANUALLY OPERATED DOOR LOCK KEEPER COMPRISING AN ELONGATED LONGITUDINALLY SLIDABLE LOCKING BOLT HAVING A GEAR RACK FORMED ALONG AN EDGE THEREOF, A ROTATABLE GEAR ENGAGING THE GEAR RACK, A HANDLE CONNECTED TO THE GEAR TO ROTATE THE LATTER AND THEREBY MOVE THE LOCKING BOLT LONGITUDINALLY, A SPRING CONNECTED TO THE LOCKING BOLT FOR URGING THE LATTER OUTWARDLY TO A NORMAL LOCKING POSITION, AN OBSTRUCTING MEMBER MOVABLY MOUNTED FOR MOVEMENT INTO AND OUT OF THE PATH OF THE LOCKING BOLT, RESILIENT MEANS NORMALLY URGING THE OBSTRUCTING MEMBER INTO THE PATH OF THE LOCKING BOLT WHEN THE LATTER IS IN ITS NORMAL POSITION, SAID OBSTRUCTING MEANS BEING ARRANGED TO PERMIT A PREDETERMINED MOVEMENT OF THE BOLT WHILE THE LATTER IS IN ITS LOCKING POSITION, AN ELECTROMAGNET OF WHICH THE OBSTRUCTING MEMBER FORMS AN ARMATURE ADAPTED, WHEN ENERGIZED, TO MOVE THE OBSTRUCTING MEMBER OUT OF THE PATH OF THE LOCKING BOLT, A CIRCUIT FOR THE MAGNET, SAID CIRCUIT BEING NORMALLY OPEN WHEN THE BOLT IS IN ITS LOCKING POSITION, AND A SWITCH IN THE CIRCUIT LOCATED IN THE PATH OF THE BOLT TO BE OPERATED BY THE LATTER DURING SAID PREDETERMINED MOVEMENT THEREOF TO CLOSE THE CIRCUIT AND THEREBY ENERGIZE THE MAGNET AND PERMIT THE LOCKING BOLT TO BE FULLY WITHDRAWN FROM ITS LOCKING POSITION.