Electromagnetic door lock system
September 11, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2601775 3126218 Pressure-free fail-safe emergency door closer Doppler shift actuator and intrusion systems Burglar alarms utilizing ultrasonic waves Magnetic emergency exit door lock with delayed opening Near ultrasonic pattern comparison intrusion detector Magnetic emergency exit door lock with time delay Surveillance and control system for emergency exists installed in a building Patent #: 4652862 InventorsApplicationNo. 06/906168 filed on 09/11/1986US Classes:292/251.5, MAGNETIC292/92, Emergency operating means340/542, Lock361/170, Condition responsive (e.g., external circuit condition)49/25, RADIANT ENERGY CONTROL49/31, CONDITION RESPONSIVE CONTROL70/277Electrical type (e.g., solenoid)ExaminersPrimary: Gall, Lloyd A.Attorney, Agent or FirmInternational ClassesE05B 65/10 (20060101)E05B 49/00 (20060101) E05C 19/16 (20060101) E05C 19/00 (20060101) G01S 15/00 (20060101) G01S 15/04 (20060101) G01S 7/539 (20060101) AbstractAn electromagnetic door lock system employs an electromagnetic lock which magnetically bonds with an armature plate. An acoustical sensor generates a detection beam. The detection beam is directed toward the doorknob. Reflected energy is received and electronically processed to detect the presence of a foreign object in the vicinity of the doorknob. The lock automatically deactuates when a foreign object is detected in the vicinity of the knob. The electromagnetic lock, sensor and processing circuitry are mounted in a housing which is located near the top of a doorway. An audio alarm and status light indicators are mounted at the housing to indicate the status of the lock. | |
