# US 11,297,973 B2 · Decoction device and extraction apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,297,973 B2 - Document ID: US11297973B2 - Status: Granted - Kind: B2 - Application number: 16/163,834 - Filed: 2018-10-18 - Published: 2019-04-25 - Granted: 2022-04-12 - Earliest claimed: 2017-10-20 - Assignees: J.M. De Jong Duke Automatenfabriek B.V. - Applicants: J.M. De Jong Duke Automatenfabriek B.V. - Inventors: Cornelis De Groen; Eduard Adri Brijder - Web page: https://patentgrep.com/patent/US11297973B2 ## CPC - A47J 31/3614: {Means to perform transfer from a loading position to an infusing position} - A47J 31/0647: {with means to adjust the brewing chamber volume to accommodate different quantities of brewing material} - A47J 31/3619: {Means to remove coffee after brewing} - A47J 31/3671: {Loose coffee being employed} - A47J 31/3695: {Cartridge perforating means for creating the hot water inlet (cartridge perforating means of the filter holder for creating the beverage outlet A47J31/0673)} - A47J 31/405: {with one or more infusion chambers moving successively between loading, infusing and dumping stations} - B65D 85/8043: {Packages adapted to allow liquid to pass through the contents (B65D85/808 takes precedence; filters or reusable cartridges for coffee or tea makers, not used as packages A47J31/06)} - A47J: KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES ## Abstract A decoction device for an extraction apparatus, in particular for preparing espresso, comprises a decoction chamber (7) enclosed by a chamber wall (5) for receiving a quantity of powder therein. The decoction chamber is situated between a first chamber bottom (20) and a second chamber bottom (30). The first chamber bottom (20) is coupled to a linear actuator and is axially movable in the decoction chamber so as to compress the powder to a bed. A drive is provided to impose a relative rotation between one of the chamber bottoms and the chamber wall as the chamber bottoms (20,30) approach each other. The respective chamber bottom (30) is for this purpose rotatable within the chamber wall (5) and the drive is able and configured to impose a rotation thereon during an approach movement of the first chamber bottom (20). A slip coupling (60) is provided in the transmission. ## Claims ### Claim 1 A decoction device for an extraction apparatus, in particular for preparing espresso, comprising a decoction chamber enclosed by a chamber wall for receiving a quantity of powder therein, which decoction chamber extends longitudinally between a first chamber bottom and a second chamber bottom, wherein at least the first chamber bottom is coupled to a linear actuator and is axially movable in the decoction chamber so as to compress the powder in the decoction chamber to a bed, and wherein a drive is provided to impose a relative rotation between at least one of the chamber bottoms and the chamber wall as the chamber bottoms approach each other, wherein the second chamber bottom is rotatable within the chamber wall, and wherein the drive is coupled to the second chamber bottom to impose a relative rotation by the second chamber bottom with respect to the chamber wall during an approach movement of the first chamber bottom. ### Claim 2 (depends on 1) The decoction device as claimed in claim 1, wherein the drive comprises a transmission to the actuator of the first chamber bottom. ### Claim 3 (depends on 2) The decoction device as claimed in claim 2, wherein the transmission comprises a gearwheel transmission and that the actuator comprises a screw spindle. ### Claim 4 The decoction device as claimed in one or more of the foregoing claims, wherein the second chamber bottom is coupled via a slip coupling to the drive. ### Claim 5 (depends on 4) The decoction device as claimed in claim 4, wherein the slip coupling comprises a set of friction bodies which lie under pressure against each other transversely of a drive line, in particular under a spring pressure of spring means. ### Claim 6 (depends on 1) A decoction device according to claim 1, wherein the drive comprises a transmission to the actuator and that said transmission comprises a slip coupling. ### Claim 7 (depends on 6) The decoction device as claimed in claim 6, wherein the slip coupling comprises a set of friction bodies which lie against each other transversely of a drive line under pressure, in particular under a spring pressure of spring means. ### Claim 8 (depends on 6, 7) The decoction device as claimed in claim 6 or 7, wherein the transmission comprises a gearwheel transmission to a chamber bottom driven thereby and that the actuator comprises a screw spindle. ### Claim 9 (depends on 6) The decoction device as claimed in claim 6, wherein the at least one of the chamber bottoms bears a relief on a main surface facing toward the other chamber bottom. ### Claim 10 (depends on 6) An extraction apparatus, in particular a coffee machine, comprising a decoction device as claimed in claim 6. ### Claim 11 (depends on 6) The decoction device as claimed in claim 6, wherein the at least one of the chamber bottoms bears a relief on a main surface facing toward the other chamber bottom. ### Claim 12 (depends on 6) An extraction apparatus, in particular a coffee machine, comprising a decoction device as claimed in claim 6.