The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 27, 1999
Filed:
Oct. 23, 1997
James E Dever, Tresckow, PA (US);
Richard M Rodgers, Tresckow, PA (US);
Cornell Iron Works, Inc., Mountaintop, PA (US);
Abstract
A rolling fire door includes a door hold-open/release system that includes an electromagnet which is energized by a controller when the door is in the open position. The energized electromagnet magnetically attracts a bottom bar of the rolling door to secure the door in the open position. A key control station connected to the controller enables the electromagnet to be energized when the door is in the open position and enables the controller to deenergize the electromagnet so that the weight of the door causes the door to close. The key control station also includes a test switch which enables the controller to deenergize the electromagnet after a delay interval. The controller also deenergizes the electromagnet after a delay interval in response to activation of an alarm or in response to a thermal switch sensing a temperature in excess of a set point temperature.