Dual sensor electromagnetic door lock system
First Claim
Patent Images
1. An electromagnetic lock system adaptable for providing controlled access through a doorway having a frame mounting a door with an armature comprising:
- housing means mountable to the door frame;
electromagnetic lock means mounted to said housing means and selectively electrically energizeable for magnetically bonding with the armature to provide a locked state;
ultrasonic sensor means mounted in said housing means for generating an ultrasonic detection beam traversing a path remote from said housing and for receiving reflected echoes from said beam;
passive infrared sensor means mounted in said housing means for sensing radiant energy temperature changes from a detection zone remote from said housing means;
processing means mounted in said housing means for processing said received reflected echoes to detect the presence of a foreign object in said beam and for processing said sensed radiant energy to detect the movement of a foreign object into the detection zone; and
lock release means responsive to said processing means for automatically transforming said electromagnetic lock means to a non-locked state for a pre-established time interval upon detection of a foreign object in said beam and movement of the object into said detection zone.
11 Assignments
0 Petitions
Accused Products
Abstract
An electromagnetic lock which mounts at the top of a door frame and magnetically bonds with an armature employs both an ultrasonic sensor and a passive infrared sensor to detect the approach of an individual at the doorway. Both the ultrasonic sensor and the passive infrared detector have fan-shaped sensing regions which are positioned forwardly from the doorway. Upon detection of an individual approaching the doorway, the lock is capable of automatically releasing to allow egress through the doorway.
-
Citations
13 Claims
-
1. An electromagnetic lock system adaptable for providing controlled access through a doorway having a frame mounting a door with an armature comprising:
-
housing means mountable to the door frame; electromagnetic lock means mounted to said housing means and selectively electrically energizeable for magnetically bonding with the armature to provide a locked state; ultrasonic sensor means mounted in said housing means for generating an ultrasonic detection beam traversing a path remote from said housing and for receiving reflected echoes from said beam; passive infrared sensor means mounted in said housing means for sensing radiant energy temperature changes from a detection zone remote from said housing means; processing means mounted in said housing means for processing said received reflected echoes to detect the presence of a foreign object in said beam and for processing said sensed radiant energy to detect the movement of a foreign object into the detection zone; and lock release means responsive to said processing means for automatically transforming said electromagnetic lock means to a non-locked state for a pre-established time interval upon detection of a foreign object in said beam and movement of the object into said detection zone. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13)
-
-
12. An electromagnetic lock system comprising:
-
doorway means comprising a frame mounting a door, said door having projecting door latch actuating means and an armature; housing means mounted to the door frame generally above said door latch actuating means; electromagnetic lock means mounted to said housing and selectively electrically energizeable for magnetically bonding with the armature to lock the door; ultrasonic sensor means mounted in said housing means including positioning means for generating an ultrasonic detection beam traversing a path remote from said housing and generally downwardly therefrom at an angle to the plane of the door so as not to intersect said latch actuating means and for receiving reflected energy from said detection beam; passive infrared means mounted in said housing means for sensing radiant energy temperature changes from a detection zone remote from said housing means and generally downwardly therefrom; electronic processing means mounted in said housing means for processing received reflected energy to detect the presence of a foreign object in said beam and for processing sensed radiant energy to detect the movement of the foreign object into the detection zone; and lock release means responsive to said processing means to automatically transform said electromagnetic lock means to an unlock state for a pre-established time interval when an individual approaches the door and intersects the detection beam and the detection zone.
-
Specification