Door closer assembly

US8527101B2 · kind B2 · utility

Assignee

• Yale Security Inc. · US

Inventors

• Charles E. Burris · Concord, US
• Robert L. Tadlock, Jr. · Charlotte, US
• John White · Huntsville, US
• Jason Scott Gurley · Madison, US
• Steven Michael Faes · Huntsville, US
• Joseph McGinty · Madison, US
• Wade C. Patterson · Huntsville, US

Key dates

• Filing date: Apr 16, 2010
• Grant date: Sep 3, 2013
• Expiry date: May 30, 2031

Classification

• Technology area (CPC E): Fixed Constructions
• CPC primary: E05Y2900/132
• WIPO field: Civil engineering
• WIPO sector: Other fields

Abstract

A door closer comprises a piston cooperating with a rotating pinion. Upon rotation of the pinion in the door opening direction, the piston moves toward the second end of the housing forcing fluid from a second variable volume chamber through a passage to a first variable volume chamber and compressing a spring assembly for storing energy. The spring assembly urges the piston toward the first end of the housing for forcing fluid from the first variable volume chamber to the second variable volume chamber and rotating the pinion in the door closing direction. A controller controls the position of a valve in the passage based on the sensed angular position of a door and the position of the valve for determining the amount of hydraulic fluid flowing through the valve.