Touch bar release locking system
Patent 4871204 Issued on October 3, 1989. Estimated Expiration Date: 
September 8, 2008. 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.
September 8, 2008. 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 3495353 3496381 Pre-intrusion detection device Door knob alarm device Surveillance and control system for emergency exists installed in a building Electromagnet access control circuit Electromagnetic door lock system Patent #: 4763937 InventorsAssigneeApplicationNo. 07/241585 filed on 09/08/1988US Classes:292/251.5, MAGNETIC292/336.3, OPERATORS WITH KNOBS OR HANDLES70/276Permanent magnetExaminersPrimary: Moore, Richard E.Attorney, Agent or FirmInternational ClassesG07C 9/00 (20060101)E05B 47/02 (20060101) E05B 65/10 (20060101) E05C 19/16 (20060101) E05C 19/00 (20060101) E05B 49/00 (20060101) AbstractThe touch bar release locking system includes a hollow metal channel which affixes to a door at two points via insulating spacer blocks. Within the channel is housed a capacitive sensor which functions by detecting the additional capacitance coupled to the hollow channel by the act of a person touching it (even through gloves or clothing). When the additional capacitance is detected, a relay energizes and actuation of the relay contacts releases an electric lock which had been securing the door, thereby providing free egress. In the event of catastrophic sensor failure, egress can still be accomplished by pressing an electromechanical push button, mounted on the rear of the hollow channel, which duplicates the effect of energization of the sensor relay. | |
