Tank piston with improved seal and wiper

Details Tank piston with improved seal and wiper Tank piston with improved seal and wiper

F - Mech Eng,Light,Heat,Weapons

16

J

F16J 9/20 (2006.01) B65D 83/76 (2006.01) B65D 90/00 (2006.01) F16J 9/26 (2006.01) F16J 15/32 (2006.01) F16J 15/56 (2006.01)

Patent

CA 2395677

A tank piston (10) is shown with an improved seal (68) and wiper (38). The piston is used in conjunction with tanks used for transporting semi-solid and viscous materials such as grease, oil, ink, and the like. The improved seal consists of an annular robber member with a hollow chamber (74) filled with an open cell foam material (76) such as polyurethane, or a gel such as silica gel. The material in the chamber is compressible and expandable to provide a seal about the piston. Optionally, the piston is provided with an annular wiper structure (38) that extends about the outer forward periphery of the piston, and is forwardly angled at about 45° relative to an axis of the piston. The wiper has a beveled end (39) that makes contact with the interior surface of the tank to provide a cleaning action. A complementary second wiper (38a) may be added near the outer rearward periphery of the piston. A preferred embodiment is also shown that uses a tiered support assembly.

L'invention concerne un piston (10) de réservoir doté d'un joint< >amélioré (68) et d'un segment racleur (38). Le piston est utilisé avec des réservoirs destinés au transport de matières visqueuses et semi-solides, telles que de la graisse, de l'huile, de l'encre et similaire. Le joint amélioré comprend un élément en caoutchouc annulaire pourvu d'une chambre creuse (74) remplie d'un produit à alvéoles ouverts (76), tel que le polyuréthane ou un gel tel que le gel de silice. Le produit de la chambre est compressible et expansible de manière à créer un joint autour du piston. Facultativement, le piston est doté d'une structure de segment racleur annulaire (38) qui s'étend autour de la périphérie frontale externe du piston et forme un angle frontal d'environ 45 DEG par rapport à un axe du piston. Le segment racleur (38) présente une extrémité en biseau (39) qui rentre en contact avec la surface intérieure du réservoir afin d'effectuer le nettoyage. Un second segment complémentaire (38a) peut être ajouté à proximité de la périphérie externe arrière du piston. Un mode de réalisation préféré concerne également un ensemble support à étages.

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