Brewing apparatus for a coffee machine

A - Human Necessities – 47 – J

Patent

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Details

A47J 31/40 (2006.01)

Patent

CA 2092910

An infusion device for a coffee machine has an infusion cylinder (1) with a cylindrical chamber (2) and two pistons (3, 4). The infusion cylinder (2) and the pistons (3, 4) are arranged so as to be movable with respect to one another. In an infusion position, the infusion cylinder (1) and the two pistons (3, 4) inside it form an infusion chamber (5) for the purpose of infusing ground coffee within it by the introduction of water under pressure. The latter is taken to the infusion chamber (5) via a connecting nipple (18) and a through drilling extending through the wall of the infusion cylinder (1) into a circular slot (14) formed between a sealing ring (11) and the surface (13) of the second piston (4) facing the infusion chamber (5}. The coffee is discharged through a filter (32), a pipe (34) and a further connecting nipple (35). The arrangement of the slot (14) makes it possible to make the face (13) of the second piston (4) without a filter. The supply of water under pressure to the slot (14) produces a self-cleaning action therein. Because the face (13) of the second piston (4) has no filter, not only is one wearing part eliminated but also the infusion device can be made more economically.

Un dispositif de préparation pour machine à café comprend un cylindre de préparation (1) avec un passage cylindrique (2) et deux pistons (3, 4). Le cylindre de préparation (1) et les pistons (3, 4) sont mobiles les uns par rapport aux autres. Dans une position de préparation, le cylindre de préparation (1) et les deux pistons (3, 4) qu'il contient forment une chambre de préparation (5) dans laquelle le café en poudre est infusé par amenée d'eau sous pression, dans la chambre de préparation (5), par un raccord fileté (18), un passage débouchant qui traverse la paroi du cylindre de préparation (1) et une fente circulaire (14) formée entre une rondelle d'étanchéité (11) et la face frontale (13) du deuxième piston (4) tournée vers la chambre de préparation (5). Le café sort en passant par un filtre (32), un conduit (34) et un autre raccord fileté (35). L'agencement de la fente (14) permet d'éliminer tout filtre de la face frontale (13) du deuxième piston (4). L'amenée d'eau sous pression à travers la fente (14) nettoie automatiquement celle-ci. L'absence de filtre sur la face frontale (13) du deuxième piston (4) permet non seulement d'éliminer une pièce d'usure, mais aussi de fabriquer le dispositif de préparation de manière plus économique.

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