公开(公告)号：US11428039B2

公开(公告)日：2022-08-30

申请号：US17074876

申请日：2020-10-20

Applicant: Masonite Corporation

Inventor： Benjamin Wesley Docksteader ,  Joel Sellinger

IPC: E05F15/20 ,  E05F15/72 ,  E05F1/12 ,  G08B3/10

Abstract: An emergency door closing device that can be installed upon existing doors and hinges to automatically close doors in the response to smoke and fire. The improvements incorporated therein include a hinge cam pivot member that attaches to an existing hinge member of a door and produces a moment force about the existing hinge member allowing a reduced force necessary to pivot the door into a closed position. Further, a novel spring, cam, and lever system is incorporated to activate the moment force to close the door.