F - Mech Eng,Light,Heat,Weapons – 28 – F
Patent
F - Mech Eng,Light,Heat,Weapons
28
F
F28F 1/40 (2006.01) F28F 1/42 (2006.01)
Patent
CA 2164515
Tube (1) internally grooved by helicoidal ribs (2) having a helix angle of 5 to 50 , an apex angle (alpha) of 30 to 60 . The tube is characterized in that the ribs (2) form a periodic profile comprising at least two ribs of different heights, one designated high (2h) of a height Hh, and the other designated low (2b) of a height Hb, with a ratio Hb/Hh of 0.40 to 0.97, each high rib being bordered by a flat-bottomed groove (3).
Le tube (1) rainuré intérieurement par des nervures hélicoidales (2) d'angle d'hélice compris entre 5 et 50°, d'angle d'apex (alpha) compris entre 30 et 60C, est caractérisé en ce que lesdites nervures (2) fonnent un profil périodique au moins deux nervures, de bauteur différen?e, l'une dite haute" (2h) de hauteur Hh, et l'autre dite "basse" (2b) de hauteur Hb, avec un lapport Hb/Hh compris entre 0,40 et 0,97, chaque nervure "haute" étant bordée par une rainure (3) à fond plat.
Messant Michel
Pinet Veronique
Predki Rene
Kme France Sas
Robic
Trefimetaux
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