Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
James S. Chang0
Mark D. Siegler0
David J. Miller0
Date of Patent
January 15, 2008
Patent Application Number
09547563
Date Filed
April 12, 2000
Patent Citations Received
Patent Primary Examiner
Patent abstract
A jack shaft garage door operator for opening and closing a movable garage door has a drive containing an electric motor. A rotatable jack shaft is connected to the drive unit to be driven thereby. A pull-up cable drum is connected to and driven by the jack shaft. A pull-up cable extends from the drum about which it is wound and connects to a bottom part of the garage door to raise the door. A pivoting arm is mounted near the jack shaft and provides tension to the cable. A shaft lock hub mounted on the jack shaft is engaged and locked by the arm if the tension in the cable drops. A stop is mounted on the garage door for engagement by the movable arm in the event that the door is opened without the cable being drawn in the cable drum.
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