JOINTING METHOD FOR BICYCLE FRAME

• Main Authors: SUETSUGU KENICHIRO, NISHIHARA MUNEKAZU, FUKUSHIMA TETSUO
• Format: Patent
• Language: English
• Published: 04.09.1990
• Subjects: CASTING; CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES; CYCLE AXLE SUSPENSIONS; CYCLE FRAMES; CYCLE SIDE-CARS, FORECARS, OR THE LIKE; CYCLE STEERING DEVICES; CYCLES; LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS; PERFORMING OPERATIONS; POWDER METALLURGY; RIDER-OPERATED TERMINAL CONTROLS SPECIALLY ADAPTED FORCYCLES; TRANSPORTING

PURPOSE:To improve the joint strength without processing a pipe member and obtain a bicycle frame having the excellent safety and reliability by locating a shape memory ring at a joint part of a pipe material and a lug material, and heating both materials to be fixed. CONSTITUTION:A lug 1 is precisely casted in a lost wax process, etc., and an external thread part 1a is formed in the tip thereof. A one directional shape memory ring 3 in which an internal thread 3a is processed is previously inserted into a pipe 2, and thereafter, the ring is heated to be enlarged and is integrated with the pipe 2 by the generation of a large frictional force. Thereafter, the adhesive is coated on a joint part of the lug 1 and the pipe 2 to join both, and the adhesive is heated to be hardened in a constant temperature bath. With this structure, a mechanical joint is possible without the conventional thread processing and rivet hole processing to the pipe 2, and the generation of the stress concentration can be prevented, and a bicycle frame having the high safety and the high reliability can be obtained.