Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Barry Drager0
Date of Patent
August 10, 2010
0Patent Application Number
122637830
Date Filed
November 3, 2008
0Patent Primary Examiner
Patent abstract
A lift-assist system for a man-way cover includes a unitary spring mounted to the axis of rotation for the man-way cover. The spring includes a coil portion on either side of the axle of rotation, with a unitary bridge portion spanning between the coil portions. The bridge portion of the spring presses down on a cantilevered extension of the man-way cover, called a duck bill. A first predetermined spacing is provided between the coil portions and the axle and second predetermined spacing is provided between the ends of the coil portions and the mounting of the axle. These predetermined spacings accommodate the variations in the coil geometry as the man-way cover moves from a fully shut position to a fully open position and vice versa.
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