Coffee extracting apparatus having a control valve for controlling a feed of pressed hot water to an extracting container
AssigneeSanden Corporation
InventorsMakoto Kobayashi, Isao Katou, Karin Okamura, Akio Kawabata
Life of this patent
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Abstract
In a coffee extracting apparatus in which an extracting container (51) extracts coffee essence from coffee powder with being supplied with hot water of substantially normal pressure and elevated temperature, a water control valve (48) controls a feed of the hot water to the extracting container. The hot water is fed to the extracting container with being pressed in a water feeding device (43). The coffee essence is taken out from the extracting container together with the hot water through a filter member (53, 54) supported by a support member (52).
Claims15
A coffee extracting apparatus comprising an extracting container having an outlet opening for extracting coffee essence from coffee powder after being supplied with hot water and a support member for supporting a filter member to cover said outlet opening of the extracting container, said coffee extracting apparatus further comprising:
- a water feeding device connected to said extracting container for feeding said hot water to said extracting container, said water feeding device including a reservoir for holding water at an elevated temperature and a pressure elevating device for elevating the pressure of the water held in the reservoir;
- a water control valve connected to said water feeding device at a location between an outlet from said reservoir and an inlet to said extracting container for controlling a feed of said hot water from said water feeding device to said extracting container.
A method of extracting coffee essence in a coffee extracting apparatus having water feeding device, an extracting container, and a water control valve for controlling the flow of hot water from the water feeding device to the extracting container, comprising the steps of:
- opening the water control valve during a first time duration to feed a particular amount of the hot water to the extracting container, said particular amount causing coffee powder in the extracting container to be prewetted;
- making the water control valve restrict the feed of the hot water to the extracting container during a second time duration;
- and
- opening the water control valve after the making step during a third time duration longer than said first time duration to feed a specific amount of the hot water to the extracting container, said specific amount causing coffee essence to be effectively extracted from the coffee powder.
A coffee extracting apparatus comprising an extracting container having an outlet opening for extracting coffee essence from coffee powder after being supplied with hot water and a support member for supporting a filter member to cover said outlet opening of the extracting container, said coffee extracting apparatus further comprising:
- a water feeding device connected to said extracting container for feeding said hot water to said extracting container, said water feeding device comprising:
- a cylinder connected to said extracting container for receiving hot water therein;
- a piston closely fitted into said cylinder and movable along a central axis of said cylinder;
- and
- a drive unit connected to said piston for driving said piston to elevate the pressure of the hot water held in said cylinder;
- and
- a water control valve connected to said water feeding device at a location between an outlet from said cylinder and an inlet to said extracting container for controlling a feed of said hot water from said water feeding device to said extracting container.
Dependencies are inferred from the claim text.