Electro-welding technique for bicycle frame junctions - uses magnetic field coil about frame junction with field set up by capacitor discharge

摘要

The technique is applicable to all the junctions in the bicycle frames and is based on the use of a coil (D) either around the junction of the frame elements or within the junction. The energy within the coil field is derived from the discharge through the coil of a bank of capacitors (C) via a series switch (B). The capacitor bank is itself charged from a high voltage source (A). The mating ends of the frame tubes can have conical, cylindrical or polygonal shapes all having in common a tapered outer tube section (11) which is forced by magnetic force onto the cylindrical section (21) of its mating part. The joint can include a double overlap or grooves to ensure keying.