The present invention provides a completely hollow, fiber reinforced plastic, bicycle fork (14) with left and right dropouts (212 L, 212 R) and an integral steer tube (214), wherein the fork (14) is adapted to be fitted to a head structure (20) on a bicycle frame (12) having a head tube axis and a for rotation about the head tube axis, the steer tube (214) having a top end and a lower bearing seat (62, 64), a fork crown (230) and blade (232, 234) terminating in a tip (216L, 216R); the fork (14) is formed substantially entirely of fiber reinforced plastic made up of a plurality of layers formed in laminations, the layers extending the entire length of the fork (14) from the tip (216L, 216R) to the top end and passing through the crown (230); the fork (14) is formed to have additional reinforcements proximate the crown (230) in which the reinforcements strengthen the crown (230) but also provide evident areas of stress in the event selected loads are exceeded; a steer tube base (218) is formed as a transition between the crown (230) and the steer tube (214); a lower bearing seat (64) is formed on the steer tube base (218); an upper bearing receivable portion (62) is formed and located a distance spaced from the steer tube base (218) in the direction of the top end; the lower bearing seat (64) is formed of a diameter substantially larger than the upper bearing receivable portion (62); the fork (14) is molded to shape; and wherein the lower bearing seat (64) is configured while molding to directly receive a bearing without post-molding shaping.
Click here for the full patent text at DEPATISnet [PDF]
Published patent application
Disclosure date: 10-02-2007
Publication date: 11-16-2011
Applicant: TREK BICYCLE CORP, US
Inventor: CUSACK DOUGLAS A, US ; COLEGROVE JAMES E, US
© European Patent Office. This information was obtained from the espacenet of the European Patent Office. There is no guarantee of its correctness or curency. For additional information, please use the research at espacenet. It is possible to determine the current legal and procedural status of patents and utility patents/models at http://worldwide.espacenet.com/ kfree of charge.