David M Guthrie

US Patent:

20080278281, Nov 13, 2008

Filed:

Apr 4, 2008

Appl. No.:

12/080739

Inventors:

Eric Lavin - Burlington NJ, US
David Charles Guthrie - Chester Springs PA, US
Bernd Kagerer - Lawrenceville NJ, US

International Classification:

G08C 19/00

US Classification:

340 57

Abstract:

A method, system and apparatus for operating a safety sensitive edge for the safeguarded motor-driven movement of a door or gate having a moving edge is provided. An external sensing device(s) arranged in a feedback loop is disposed proximate the moving edge of the door and generates a fault signal when an obstruction is detected or when components of the feedback loop have systemically failed. A user indicates a desire to move the door by selecting a button, which generates a depressed signal while the button is depressed. The status of these signals is provided to a controller. In the absence of the fault signal, the controller generates an output signal indicating safe movement of the door is possible. If the fault signal is present, the controller generates an output signal indicating safe movement of the door is possible when the depressed signal is provided to the controller.

US Patent:

D3223868, Dec 17, 1991

Filed:

Oct 11, 1989

Appl. No.:

7/419632

Inventors:

John F. Ginther - North Wales PA
Kim E. Burrichter - Upper Darby PA
Charles P. Coggins - Downingtown PA
David C. Guthrie - Chester Springs PA
Mark K. Lucchi - West Chester PA

Assignee:

Allister Manufacturing Company, Inc. - West Chester PA

US Classification:

D 8330

US Patent:

D3245110, Mar 10, 1992

Filed:

Oct 11, 1989

Appl. No.:

7/420126

Inventors:

John F. Ginther - North Wales PA
Kim E. Burrichter - Upper Darby PA
Charles P. Coggins - Downingtown PA
David C. Guthrie - Chester Springs PA
Mark K. Lucchi - West Chester PA

Assignee:

Allister Manufacturing Company, Inc. - West Chester PA

US Classification:

D13170