Phase-controlled sequential gripping tube fitting

F - Mech Eng,Light,Heat,Weapons – 16 – L

Patent

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Details

F16L 19/10 (2006.01)

Patent

CA 2278555

A phase-controlled, sequential-gripping tube fitting includes a main fitting body (10) having a tube end receiving opening (24) with a tapered camming mouth (28) forming the entry to the opening. A front female (36) with a tapered forward nose surface (44) is engaged with the camming mouth (28) and includes a rear surface (46) with a conically tapered recess extending forwardly toward the nose surface (44). Extending into the conically tapered recess (46) of the front ferrule (36) is a rear ferrule (38) having a rear force receiving surface (60). A coupling nut (14) is threadedly connected to the main body (10) and has a force applying face (62) engaged with the rear force receiving surface (60) of the rear ferrule (38). An arrangement is provided to control outward buckling of the rear ferrule (38). The arrangement includes a central body (54) located between the nose portion (52) and the rear force receiving surface (60) of the rear ferrule (38). A cylindrical flange (66) extends rearwardly from the front ferrule (36) at a location radially outwardly of the rear recess (46). The flange (66) has a cylindrical interior surface (68) that closely surrounds the central body (54) of the rear ferrule (38). The central body (54) is of a length such that engagement between the coupling nut (14) and the axial end face (66a) of the cylindrical flange of the front ferrule (36) is not possible at any point during make-up.

L'invention concerne un raccord de tube à préhension séquentielle en commande de phase qui comprend un corps de raccord principal (10) à ouverture pour réception d'extrémité de tube (24), l'entrée de cette ouverture étant formée par une embouchure de déverrouillage (28). Une ferrule frontale (36) à surface avant cônique (44) est en prise avec l'embouchure en question (28) et comporte une surface arrière (46) à cavité cônique s'étendant en avant vers la surface avant (44). Une ferrule arrière (38) à surface de réception de force arrière (60) s'étend dans la cavité cônique (46) de la ferrule avant (36). Un écrou-raccord (14) est fixé par filetage au corps principal (10) et a une face d'application de force (62) en prise avec la surface de réception de force arrière (60) de la ferrule arrière (38). Un système est prévu pour contrôler la déformation vers l'extérieur de la ferrule arrière (38). Il comprend un corps central (54) placé entre la partie avant (52) et la surface de réception de force arrière (60) de la ferrule arrière (38). Une bride cylindrique (66) s'étend vers l'arrière depuis la ferrule frontale (36), en un emplacement radialement extérieur à la cavité arrière (46). La bride (66) a une surface intérieure cylindrique (68) qui entoure étroitement le corps central (54) de la ferrule arrière (38). Le corps central (54) a une longueur telle que l'écrou-raccord (14) et la face d'extrémité axiale (66a) de la bride cylindrique de la ferrule frontale (36) ne puissent jamais être en prise durant la mise en place.

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