Drive for a coffee-making device
AssigneeJ.M. De Jong Duke Automatenfabriek B.V.
InventorsAbraham Gijsbert De Koning, Jan Cornelis Van Hattem
Life of this patent
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Abstract
Coffee-making device with a piston/cylinder unit, the piston (3) being driven by a drive mechanism. A swivelling arm structure is also driven by means of said drive mechanism (10, 11), with the interposition of a cam-cam follower mechanism. The swivelling arm structure is provided with a cover (39) for closing off the free end of the cylinder (2). The cover can be pressed onto the cylinder by means of a cam structure.
Claims13
Coffee-making device (1, 51), 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 means for removing the compressed coffee tablet, said movable cover comprising a swivelling arm structure (13), which is rotatable substantially about and over said cylinder in such a way that said cover can be moved above and away from the end of the cylinder, in order to bring said cover into engagement in a sealing 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.
Coffee-making device according to one of the preceding claims, in which a cam/cam follower mechanism is present for transmitting said reciprocating motion.
Coffee-making device according to one of the preceding claims, comprising spring means for driving said swivelling arm structure into the position above the free end of said cylinder.
Coffee-making device according to one of the preceding claims, in which said swivelling arm structure is provided with means (36) for discharging said coffee tablet.
Coffee-making device according to one of the preceding claims, in which said drive mechanism is designed to rotate in two directions.
Coffee-making device according to one of the preceding claims, in which said means for discharging brewed coffee from the compression chamber comprise a restriction which reacts to pressure, designed in such a way that at relatively low pressure a restriction with larger passage is present and at relatively higher pressure a restriction with smaller passage is present.
Dependencies are inferred from the claim text.