Method and apparatus for interlocking tubular members

B - Operations – Transporting – 21 – D

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Details

B21D 39/04 (2006.01) B60N 2/68 (2006.01) F16B 17/00 (2006.01)

Patent

CA 2479330

A method and apparatus for interlocking at least one first tube (10) having a first diametric spacing between opposite points of the tube wall with a second tube (4) having a second diametric spacing between opposite points of the tube wall which is larger than the first diametric spacing. The first tube is loaded over a mandrel (50) having a punching end (54), and disposed into a holding block (30) having a holding cavity (32) conforming closely to the outer surface of the first tube. The second tube is disposed over a receiving block (40), which has a receiving cavity conforming closely to the outer surface of the first tube. The punching end of the mandrel is driven through the second tube and into the cavity in the receiving block, followed by the first tube. When the first tube reaches a lower limit of the receiving cavity, the first tube is compressed axially. The mandrel supports the interior of the first tube, the holding cavity prevents the trailing portion of the first tube from swelling outwardly, and the receiving cavity prevents the leading portion of the first tube from swelling outwardly. Thus, the portion of the first tube disposed inside the second tubular member swells under the axial compressive force, permanently interlocking the first tube with the second tube. The punching steps can be separated from the remaining steps of the method of the invention, or the second tube can be pre-punched. In further embodiments the method and apparatus of the invention can create a clinched interlock and/or a 'T'-shaped interlocked assembly.

L'invention concerne un procédé et un appareil d'emboîtement d'au moins un premier tube (10) doté d'un premier espace diamétral entre des points opposés de la paroi du tube qui est plus large que le premier espace diamétral. Le premier tube est chargé sur un madrin (50) doté d'une extrémité de perforation (54), et est placé dans un bloc de support (30) pourvu d'une cavité de support (32) sensiblement conforme à la surface externe du premier tube. Le second tube est placé sur un bloc de réception (40) qui est pourvu d'une cavité de réception sensiblement conforme à la surface externe du premier tube. L'extrémité de perforation du mandrin est actionnée à travers le second tube jusque dans la cavité du bloc de réception, suivi du premier tube. Lorsque le premier tube atteint une limite inférieure de la cavité de réception, le premier tube est comprimé dans le sens axial. Le madrin soutient l'intérieur du premier tube, la cavité de support empêche la partie arrière du premier tube de faire saillie vers l'extérieur, et la cavité de réception empêche la partie avant du premier tube de faire saillie vers l'extérieur. Par conséquent, la partie du premier tube placée à l'intérieur du second élément tubulaire fait saillie sous l'effet d'une force de compression axiale, emboîtant ainsi constamment le premier tube dans le second tube. Les étapes de perforation peuvent être séparées des autres étapes selon le procédé de l'invention, ou le second tube peut être préalablement perforé. Dans d'autres modes de réalisation, le procédé et l'appareil de l'invention peuvent créer un emboîtement replié et/ou un ensemble emboîté en forme de T.

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