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:
Jul. 30, 2013
Filed:
Aug. 27, 2009
Scott B. Lowder, Orange, CT (US);
Dale D. Martin, East Lyme, CT (US);
Jon Hulse, Wethersfield, CT (US);
Robert C. Hunt, Reno, CT (US);
Arthur Limoncelli, New Haven, CT (US);
Wai P. Wong, Orange, CT (US);
Scott B. Lowder, Orange, CT (US);
Dale D. Martin, East Lyme, CT (US);
Jon Hulse, Wethersfield, CT (US);
Robert C. Hunt, Reno, CT (US);
Arthur Limoncelli, New Haven, CT (US);
Wai P. Wong, Orange, CT (US);
Sargent Manufacturing Company, New Haven, CT (US);
Abstract
A drive mechanism for door hardware, such as a pushbar exit device, includes a driver for moving a component of the door hardware, a controller for controlling the operation of the driver, a sensor for detecting motion of the moving component and a spring connected between the driver and the door hardware component. The spring allows the driver to move for a period of time after the component has stopped moving. The controller monitors the sensor and moves the component until the sensor indicates that the driven component has stopped moving. The sensor produces an output signal and the controller detects an inflection point in the output signal when the component stops moving while the driver is still operating.