Patent ID: 6375210
Filing Date: 2002-04-23
Classification: B62K

Abstract:
A method of constructing a head tube junction of a bicycle frame including at least a head tube, a top tube, and a down tube, comprising steps of:providing a top tube and a down tube, each having a first end, a second end, and an outer surface, and the outer surface bounding a transverse cross-sectional area at each first and second end, the transverse cross-sectional area at each first end being at least equal to the transverse cross-sectional area at each second end; forming the first end of the top tube at a first predetermined angle with respect to a longitudinal axis of the top tube so that the top tube is enabled to be mitered to the head tube at the first predetermined angle; forming the first end of the down tube at a second predetermined angle with respect to a longitudinal axis of the down tube so that the down tube is enabled to be mitered to the head tube at the second predetermined angle; forming a portion of the wall of the top tube at the first end thereof to form an abutting surface, and forming a portion of the wall of the down tube at the first end thereof to form mating abutting surfaces in a common plane at an acute angle to the longitudinal axes of the top and down tubes; and fastening the head, top, and down tubes at the head tube junction at interfaces between the wall of the head tube and the respective first ends of the top and down tubes, and between the abutting surfaces of the top and down tubes along said common plane.