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US Patent 7488275 Free wheel clutch mechanism for bicycle drive train

Patent 7488275 was granted and assigned to Nautilus, Inc. on February, 2009 by the United States Patent and Trademark Office.

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Patent
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Patent attributes

Current Assignee
Nautilus, Inc.
Nautilus, Inc.
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Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
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Patent Number
74882750
Patent Inventor Names
Michael H. Harding0
William A. Baker0
Patrick Warner0
Mu-Chuan Wu0
Date of Patent
February 10, 2009
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Patent Application Number
100933260
Date Filed
March 6, 2002
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Patent Primary Examiner
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Stephen R. Crow
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Patent abstract

An exercise bicycle including a frame having a seat and handlebars, a high-inertia flywheel having a hub at a center of rotation, the flywheel being rotatably supported on the frame at the hub, and a drive train including a drive sprocket, a crank arm attached to and extending from the drive sprocket, and a pedal attached to the crank arm, the drive train being rotatably supported by the frame. The drive train also includes a slave sprocket fixed to the flywheel at the hub, with the drive and slave sprockets connected in a direct-drive relationship, the drive train driveable in a forward and rearward directions to cause the flywheel to rotate. A clutch mechanism is positioned in engagement with the slave sprocket and the hub to create a frictional engagement between the sprocket and the hub, and to establish a break-free force threshold. When the drive train is actuated in the forward direction, the slave sprocket and the hub move together, and when the drive train is actuated in the rearward direction under the influence of a force greater than the break-free force threshold, the clutch mechanism slips between the slave sprocket and the hub, allowing the slave sprocket and the flywheel to move independently of one another. The clutch mechanism including a spring tensioner whereby the break-free force may be adjusted.

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