Door opening and closing system
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 2, 2004
Grant Date -
N/A
app pub date -
Jul 9, 2001
filing date -
Aug 19, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus assists a user to move a door between closed and open states. The apparatus includes a permanent magnet provided on the door. An electromagnet is located on the door frame adjacent thereto when the door is closed and is energizable to provide a magnetic field which reinforces the permanent magnetic field or to provide a magnetic field in opposition to the permanent magnetic field. A detector detects the state of the door and an interface detects the presence of a user. A controller receives input from the detector and the interface and energizes the electromagnet to provide a reinforcing magnetic field if a user is attempting to open the door and provides an opposing magnetic field to the permanent magnetic field if the door is closed and the user is attempting to open the door.
First Claim
Family
International Classification(s)
Cited Art Landscape
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