Coffee-making device with pressure control
AssigneeDe Jong Duke
InventorsAbraham Gijsbert De Koning, Jan Cornelis Van Hattem
Life of this patent
Estimating the term…
Abstract
Coffee-making device with a piston/cylinder unit, the piston (3) being driven by a crankshaft (11). A swivelling arm structure (13) is also driven by means of the crankshaft, with the interposition of a cam/cam follower mechanism. The swivelling arm structure is provided with a cover (19) for closing off the free end of the cylinder (2). The cover can be pressed onto the cylinder by means of a cam structure.
Claims16
Coffee-making device (1, 51), comprising a coffee supply line, a hot water supply line (7) with a pump, a drink outlet (26) with shut-off valve, and a coffee outlet, said coffee-making device comprises a brewing compartment for holding coffee, which brewing compartment is connected to said water supply line and to said beverage outlet, said brewing compartment comprising a cylinder in which a piston is capable of reciprocating, characterized in that said shut-off valve is designed to provide either a first passage with relatively small surface or a second passage with relatively large surface, and in that said pump is designed to provide an appropriate first, small volume displacement at high pressure and a second, large volume displacement at low pressure.
Coffee-making device (1) according to one of the preceding claims, comprising a housing with a cylinder (2) in which a piston (3) is provided, for compressing with the piston coffee placed on said piston, said piston being movable by means of a drive mechanism (10, 11), and said drive mechanism being provided in said housing, and comprising a cover (39) that can be placed on said cylinder, in order to bound a compression chamber with said cylinder and piston, means for introducing water into the compression chamber, means for discharging brewed coffee from the compression chamber, and also means for removing the compressed coffee tablet, said movable cover comprising a swivelling arm structure (13) which is rotatable around an axis substantially perpendicular to the axis of said cylinder in such a way that said cover can be moved above and away from the end of the cylinder, which swivelling arm structure is capable of reciprocating substantially perpendicular to the axis of rotation thereof, in order to bring said cover into engagement in a seating manner with said cylinder end, said drive mechanism being designed to operate both said piston and said swivelling arm and comprising a rotary input shaft, characterized in that said drive mechanism for said piston is provided with means for converting a uniform rotating motion into a non-uniform reciprocating motion.
Dependencies are inferred from the claim text.