Process for assembling a tubular structure, particularly a bicycle frame or the like

摘要

The method of frame assembly commences with pre- assembly of part of the frame. The tubular parts are held in contact by a supplementary tube (M) fitting over the short tube (13) that joins the other two tubes (2,3). Holes are formed in the supplementary tube to accept the ends of the longer tubes. The joint is dipped in a heated salt bath to assure the fusion of the supplementary tube and the other two tubes. The short tube and the supplementary tube have holes (15) of calibrated diameter positioned to allow the bath liquid to enter the end of the long tubes. The salt liquid moves between the short tube and the supplementary tube by capillary action, ensuring a rigid joint.