Method for closing a hydraulic,,pneumatic and/or...

B - Operations – Transporting – 21 – D

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B21D 39/04 (2006.01) F15B 15/14 (2006.01) F16J 10/02 (2006.01)

Patent

CA 2498954

Method for manufacturing a jack or hydraulic, pneumatic and/or olepneumatic cylinder of the kind comprising a tubular cylindrical body (4) at the ends thereof a bottom (1) and a head (5) are fastened, inside thereof a piston (2) slides integral with a rod (3), characterized in that in order to fasten in an irremovable way the head (5) and the bottom (1) to the tubular body (4) of the jack without threading and/or welding procedures, it provides implementing at the end of the tubular body a controlled plastic deformation extended to the whole thickness of the tubular body itself, apt to locally deform the ends thereof by generating on each of them at least a circumferential ring radially projecting inwards so as to insert in at least a specific groove (7) arranged on the bottom (1) and on the head (5) inserted in the tube itself, respectively, so as to lock them in sito. Said plastic deformation guarantees the mechanical seal of the coupling between tube and bottom and tube and head.

L'invention concerne un procédé de fabrication d'un vérin ou cylindre hydraulique, pneumatique et/ou oléopneumatique, du type comprenant un corps cylindrique (4) aux extrémités duquel sont fixés un fond (1) et une tête (5), et dans lequel glisse un piston (2) intégré à une tige (3). Afin de fixer de manière inamovible la tête (5) et le fond (1) au corps tubulaire (4) du vérin sans processus de filetage et/ou de soudage, une déformation plastique contrôlée est formée à l'extrémité du corps tubulaire, s'étendant sur toute l'épaisseur du corps tubulaire lui-même, et pouvant déformer localement les extrémités de celui-ci par génération sur chacune d'elles d'au moins un anneau circonférentiel se projetant radialement vers l'intérieur, de manière à s'insérer dans au moins une rainure spécifique (7) disposée, respectivement, sur le fond (1) et sur la tête (5) insérés dans le tube lui-même, de manière à les bloquer in situ. Ladite déformation plastique garantit le joint mécanique de couplage entre le tube et le fond, et le tube et la tête.

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