Metal working – Method of mechanical manufacture – Magnetically shaping
Patent
1996-07-09
1999-08-17
Bryant, David P.
Metal working
Method of mechanical manufacture
Magnetically shaping
29516, 2802811, B23P 1700
Patent
active
059374969
ABSTRACT:
A method and apparatus for coupling tubular elements of a frame without welding or adhesive bonding. Connection elements are used with which mechanical connections may be accomplished by deforming the tubular element to conform to the shape of its respective connection element. Preferably, the connection element is shaped to be inserted within a hollow end of a tubular element and includes radially inwardly directed recesses. The tubular element is deformed with respect to the recesses, preferably by electromagnetic pulse forming, to thereby lock the tubular element and connection element against relative movement. Such connection elements and method may be used in frames of mobile units such as bicycles, wheelchairs, 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.
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Benoit Robert L.
Spacht Glenn L.
Bryant David P.
NBG Technologies, Inc.
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