improvement in process for connecting casing strings

摘要

Tube joining method, particularly for manufacturing bicycle frames, comprising a first tube (21) on which a stump (11) is welded, a second tubing (16), preferably made of carbon-fibre or similar material, being fitted on to said stump (11) after appropriate treatment with adhesive of the corresponding contact surfaces. Mechanical interference means are applied on said tubes so as to prevent said second tubing (16) from rotating with respect to said stump (11). Said mechanical interference means consist both in side tabs (26a, 26b) of said second tubing (16) that close laterally in around said first tube so as to prevent a mutual torsional slippage, and in an insert made preferably of carbon-fibre or similar material, as well as an off-center construction of some of the elements forming said insert and said stump. IMAGE