| 摘要 |
<p>A method and apparatus for coupling tubular elements (12, 14, 16, 18, 20 and 22) of a frame (10) without welding or adhesive bonding. Connection elements (24, 26 and 28) are used with which mechanical connections may be accomplished by relatively deforming one of the connection elements and its respective tubular element. Preferably, the connection element (24, 26 and 28) is shaped to be inserted within a hollow end of a tubular element and includes radially inwardly directed recesses (46). The tubular element is deformed with respect to the recesses, preferably by electromagnetic pulse forming, to thereby lock the tubular element and connection element (24, 26 and 28) against relative movement. Such connection elements and method may be used in frames of mobile units such as bicycles (200), wheelchairs (110), and walkers. The forming process used in connecting the tubular frame elements may also be used to create ride compliance features in the frame by deforming at least one of the tubular elements to modify its spring constant. The ride compliance features preferably are radially inwardly or outwardly circumferential deformations.</p> |
