Land vehicles – Wheeled – Occupant propelled type
Patent
1989-09-27
1991-03-26
Bertsch, Richard A.
Land vehicles
Wheeled
Occupant propelled type
280280, B62K 2106
Patent
active
050022970
ABSTRACT:
A light weight aluminum bicycle fork with positive feel and improved control in rough conditions, and is stiffer in torsional stiffness, fore and aft stiffness and side-to-side stiffness and has a higher overall rigidity than prior art forks. A large diameter steering tube has a bearing raceway seat formed therein and a very large diameter head tube has a corresponding bearing raceway seat formed in the lowered end thereof to receive, by way of a press-fit, aircraft-type torque tube bearings. An upper bearing assembly is seated in a raceway seat formed in the upper end of the head tube. Adhesive is used to maintain the bearings in position and prevent their loosening. A pair of large diameter crown miter tubes are welded to the lower end of the steering tube and a pair of large diameter, tapered, round blade tubes are welded to the crown miter tubes and have dropouts welded to the lower ends of the blades. A one-piece aluminum bar, neck and large diameter stem is provided. A tightening wedge and the stem have complementary camming surfaces which are at a shallow angle.
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J. Wilcockson, Bicycle, 1980, pp. 98, 99, 100.
Bertsch Richard A.
Johnson Victor E.
Zegeer Jim
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