Abstract: A coffee machine is provided with a boiler for heating brewing water, a brewing cylinder defining a brewing chamber, a closure piston for closing the one open end of the brewing cylinder as well as a brewing piston for compressing the coffee powder in the brewing cylinder and/or for ejecting the elutriated coffee powder cake, whereby the brewing piston is longitudinally movable in the brewing cylinder. The closure piston is integrally formed or rigidly connected to the housing of the boiler and firmly mounted to the housing of the coffee machine. Moreover, there is provided a brewing module that is removably inserted into the housing of the coffee machine and that includes at least the brewing cylinder and the brewing piston. The brewing cylinder and the brewing piston are movable in longitudinal direction, but cannot be rotated. Such a coffee machine can be designed very compactly.

Abstract: A coffee machine is provided with a boiler for heating brewing water, a brewing cylinder defining a brewing chamber, a closure piston for closing the one open end of the brewing cylinder as well as a brewing piston for compressing the coffee powder in the brewing cylinder and/or for ejecting the elutriated coffee powder cake, whereby the brewing piston is longitudinally movable in the brewing cylinder. The closure piston is integrally formed or rigidly connected to the housing of the boiler and firmly mounted to the housing of the coffee machine. Moreover, there is provided a brewing module that is removably inserted into the housing of the coffee machine and that includes at least the brewing cylinder and the brewing piston. The brewing cylinder and the brewing piston are movable in longitudinal direction, but cannot be pivoted. Such a coffee machine can be designed very compactly.

Abstract: A coffee machine has a low overall height and allows an attractive aesthetic design to be achieved in its execution. A brewing block comprising brewing chambers is guided over a circular path, the chambers adopting three different operating positions. Brewing plungers and straining/expelling plungers move axially in the brewing chambers. Drive and control of the brewing assembly is effected by way of spur gears and cam discs which are housed in two cam disc housings located opposite one another. In accordance with a method according to the invention, the rotation to the three positions takes place in steps of 30 degrees, with resetting taking place through 60 degrees.

Abstract: A device for brewing hot beverages comprises a lower container for receiving water, an upper container for receiving brewed beverage, and a piston-cylinder assembly into which coffee grounds, tea leaves, and herbs are placed. The grounds, etc. are compressed and subjected to high temperature water and steam, to extract essences and produce a beverage, such as espresso coffee. The piston has a decompression chamber at its upper end, formed between the piston top and a perforated diffuser plate. Pressurized hot water from the lower container flows through a nozzle in the piston top, into the decompression chamber, through the holes of the diffuser plate, and then into the grounds. The piston moves upwardly to compress the grounds against an upper perforated plate, first with rising force, and then with constant force.

Abstract: A coffee dispensing device which comprises a supporting structure for a filter basket, provided with a first channel for feeding hot water and with a second channel for the outflow of the coffee. The structure also supports a hydraulic piston whose stem actuates, in contrast with at least one flexible element, a body which is provided with a containment chamber for ground coffee or coffee in tablets. The body can move approximately transversely and axially with respect to the filter basket and is temporarily associable therewith.

Abstract: In a coffee extracting apparatus for extracting coffee essence from the coffee material within an extracting device (10) with use of compressed air generated in an air compressor (11), use is made of an accumulator (23) for accumulating the compressed air. The accumulator is connected to an air passage (12) which connects the extracting device with the air compressor. An air control valve (22) is disposed in the air passage and is for controlling flow of the compressed air to make the accumulator accumulate the compressed air.

Abstract: Express-coffe-machine loadable with wafers (36) of coffee blend for family or professional use, includes a casing (2) containing one vessel (12) for the water to be heated, a boiler (16) in which the water is heated to a pre-established temperature and a unit (4) formed by one fixed lower head (5) and one movable upper head (6), which can be engaged one to the other so as to press a wafer (36) therebetween for delivering a beverage. The movable upper head (6) is carried by an arm (24) connected to a control lever (26), made integral with a fork (28) engaging the lower head (5), an is also provided with a spout (7) for distributing the beverage.

Abstract: A beverage brewing machine for producing a single serving has a lower brewer and an upper brew chamber housing. The lower brewer has a brewing cylinder defining therein a lower brewing chamber which has a reciprocal piston therein. The top of the brewing cylinder includes a liquid pervious support surface on which a beverage substance may rest. The upper brew chamber housing is received over the brewing cylinder above the liquid pervious support surface and defines an upper brewing chamber therein. The upper brew chamber housing includes an inlet which communicates with the upper brewing chamber. The upper brewing chamber receives liquid to be brewed from an external source one serving at a time.

Abstract: A coffee brewing apparatus has a first cylinder, having a top opening and a bottom opening. A vertically movable second cylinder containing ground coffee, having a top opening and a bottom opening, is disposed below the first cylinder coaxially therewith. A vertically movable upwardly urged plunger, having a top head and a bottom head, is disposed through the bottom opening of the first cylinder, coaxially therewith, in a manner that the top head is sealingly and slidingly fitted in the first cylinder and the bottom head is adapted to be sealingly and slidingly fitted in the second cylinder through the top opening thereof. The plunger has a hot water exit channel vertically therethrough and a pressure-operated hot water release valve disposed in the channel.

Abstract: In a coffee extracting apparatus in which coffee essence is extracted from coffee powder (200) in a container (51), an air feeding arrangement (43) is provided for feeding pressed air into the container. After the coffee essence is extracted from coffee powder, coffee grounds (200') are remained in the container. It is assumed that the coffee grounds are adhered to an inner surface of the container. In order to expel the coffee grounds from the container, the air feeding arrangement is controlled so that the pressed air is fed into the container after extracting the coffee essence from the coffee powder.

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).

Abstract: A coffee brewing apparatus has a first cylinder for containing hot water having a top opening, a vertically extending shaft fixedly connected to the first cylinder, the shaft having a hot water release channel vertically therethrough and a pressure-operated hot water release valve disposed in the channel, a vertically movable piston, a vertically movable second cylinder for holding ground coffee therein having top and bottom openings and disposed below the first cylinder coaxially therewith, and a vertically movable plunger sealingly and slidingly connected with the shaft. The plunger has an internal cylindrical chamber and a shallow hot water spreading chamber in a bottom section thereof. When the plunger is lowered, the bottom section thereof enters the second cylinder and compacts the ground coffee therein.

Abstract: An espresso coffee machine wherein a conveyor disk, having a number of seats, each for receiving a respective wafer, is rotated in steps about an axis to successively feed the seats through a loading station for loading the wafers, an unloading station for unloading the used wafers, and a work station where each seat is interposed between a hot-water boiler and an outlet element for a coffee beverage, and is engaged by the boiler by virtue of pressurized cold water supplied to the boiler.

Abstract: An automatic infusing apparatus includes an infusing container, lifting and lowering device for the container to higher and lower positions, device for feeding ground beans to the container when the latter is at the higher position, and a scraping device for removal of the infused ground beans. A plunger includes a sifter member which is disposed within the container and which has a peripheral portion slidable relative the container, and a stem member. The stem member has an upper section connected to the sifter member and a lower section to extend outwardly and sealingly from the lower end wall of the infusing container. The lower section of the stem member is movable relative the lower end wall of the container to lift the sift member upwardly to a scraped position downwardly to an infused position. A biasing member biases the sifter member to move from the scraped position to the infused position.

Abstract: The automatic machine for the preparation of hot beverage infusions such as coffee being formed by a group formed of a body facing a boiler intended to be brought closer to each other in order to form an infusion chamber. The machine having, between the body and the boiler, at the infusion chamber: reception members intended to receive an individual package containing the product to be infused, the reception members being intended to secure temporarily the package between the body and the boiler; a position fixing element for guiding and maintaining the package in a vertical position when the reception members are present; and an automatic ejection member which ejects the package simply by gravity, the displacement of the package being perpendicular to the axis of the machine.

Abstract: A machine for making a beverage such as espresso coffee, with automatic ground coffee introduction and dregs expulsion, having a main shaft that drives, synchronously and simultaneously, through sector-shaped gears and cams controlled thereby, the movement of a ground coffee dosage and feeding device, of a used dregs expulsion unit, of a unit that forms the extraction chamber, and, through a lever, of a plunger that forms the bottom of the extraction chamber and furthermore moves, directly or indirectly, all the other elements required for operation.

Abstract: A beverage brewer with tape formed of two layers of paper between which are packets of coffee. The tape has perforations along each edge and sprockets intermittently drive the tape so as to place fresh coffee into the brewer and to remove the used coffee from the brewing chamber.

Abstract: A hot beverage brewing unit having an auxiliary boiler surrounding a stainless steel lined brewing chamber. The brewing unit includes a chamber block made of cast bronze and constitutes a second boiler for maintaining a sufficient volume of brewing water at the exact temperature in order to handle increased brewing frequency.

Abstract: A coffee brewer of the type having an outer fixed cylindrical tube and a fixed piston within the tube. A sliding cylinder slides in sealing contact between the outer cylinder and the piston. The sliding cylinder has a filter at the top thereof. A frame mounts the piston head and the outer cylindrical tube, and motor means are mounted on the frame with a pair of rotors rotatably mounted on the frame, one on either side of the outer cylindrical tube about a lateral axis at right angles to the axial axis of the outer and sliding cylindrical tubes. Each rotor includes an arcuate segment with gear teeth on the periphery thereof. Gear means connect the motor to the rotors for rotating the rotors, and a cam connector connects the sliding cylinder to the rotors for sliding movement of the sliding cylindrical tube during the brewing cycle.

Abstract: A brewing device for a domestic espresso maker includes a brewing chamber adapted to be filled with coffee grounds. The brewing chamber has on its outlet side a filtering means and on its inlet side a piston entering the brewing chamber along the wall thereof and closing the chamber, so that water arriving from a source of pressure is forced into the brewing chamber. The water subsequently flows out of the brewing chamber at the end close to the filtering means as an espresso beverage. In the path of flow of the water, a safety device responsive to a critical pressure in the pressure system is provided between the source of pressure and the brewing chamber. In the presence of pressures prevailing under normal operating conditions, the outlet orifice is outside the brewing chamber; in the presence of a pressure exceeding a critical value, a displacement of the piston relative to the wall of the brewing chamber occurs, such as to cause the outlet orifice to become part of the brewing chamber.

Abstract: A brewing head of an espresso maker includes a housing, and a lower brewing head section fixedly attached to the housing. The lower brewing head section includes a pressure sealed brewing chamber, and a lifting piston forming a floor of the brewing chamber. The lifting piston has apertures therethrough. A water inlet is located beneath the floor of the brewing chamber. An apparatus for moving the lifting piston is provided. The brewing head further includes an upper brewing head section movable relative to the lower brewing head section. The upper brewing head section includes an upper brewing head housing, and a fill shaft. The fill shaft is in communication with the brewing chamber when the upper brewing head section is moved to a fill position. The upper brewing head section further includes a brewing piston positioned over the brewing chamber when the upper brewing head section is moved to a brewing position.

Abstract: An improved expresso coffee maker comprising an upper cylindrical container 2 threadably engaged onto a lower truncated-cone container 1, said lower container having a coffee basket assembly 3 in which a cylindrical coffee holder 4 is centered with a piston 5 sliding inside, said piston has apertures 6 to allow passage of water and steam and to create differential pressure above and below the piston, which forces the piston to compress the coffee grounds during the brewing process. The water extract of the coffee grounds passes through inverted funnel 15 and it is collected into the upper cylindrical container.

Abstract: The brewing device is composed of a housing part including a piston, vertically slidable in the housing part. On the housing part, a filter basket holder is mounted which is pivoted horizontally about the tilting axis and is provided with a filter basket to be filled with ground coffee. When the piston is lowered and reaches into the filter basket (i.e., its working position), the filter basket forms with it a pressure chamber, in which the ground coffee is enclosed, into which, on the piston side, hot water under pressure is urged through a conduit, and from which, on the filter basket holder side, the prepared espresso coffee beverage is discharged through at least one outlet opening. When the piston is lifted, the filter basket holder with the filter basket can be swung about a vertically extending tilting axis out of the range of effect of the piston.

Abstract: The invention relates to an automatic assembly for delivering infusions of coffee and the like, with means for ejecting the dry coffee grounds, characterized in that said assembly comprises a stator body, in the inside of which there is rotatably supported a rotor, including a chamber housing an infusion piston therein.The rotor can be successively located at a loading station for introducing the coffee powder, an infusion station and at an unloading station.Pressing means there are moreover provided operating on the piston for pressing the coffee powder before making the infusion, and for drying-pressing the coffee pad after having made the infusion.

Abstract: Device for instant, automatic, pressurized percolation of food liquids provided with a horizontal mechanical assembly including as main elements functional sections, especially a stationary rail, an infusion chamber with a movable bottom and a movable part carrying the compression piston sliding on the rail, and a filling chamber linked to the movable bottom by a rod whose position and section is adapted to control the movement of a scraper pivoting on a horizontal pivot. The invention is used for preparing espresso coffees.

Abstract: An automatic coffee machine, has a heating device (5), which has a heating chamber (6), which is formed from a stationary arranged pipe section (4) with a vertical axis (9) as well as two stoppers (7, 8). An axial drive for moving the upper stopper (7) on a turning arm (29) into and out of the pipe section (4) is provided. A pivot drive serves to move the upper stopper (7) into a parking position away from the axis (9) of the pipe section (4) and into a stand-by position in the axis (9) of the pipe section. A vertical drive for the lower stopper (8) is provided. A driven swivel wiper (32) serves to remove a tablet of coffee grounds. The upper stopper (7) is solidly attached to the turning arm (29). a single motor (10) with a following power divider (16) is provided for the axial drive and for the pivot drive of the turning arm (29) with the upper stopper (7) as well as the drive of the swivel wiper (32).

Abstract: An improved machine for preparing a coffee infusion, in particular for home use has an unique construction including a plurality of elements, i.e. a water boiling chamber, on the top of which can be threaded a coffee infusion collecting chamber, having a filter containing the coffee powder.The machine is characterized in that, starting from the inside of the water boiling chamber and coaxially proceeding along a fitting cylindric element, there extends a hollow vertical cylinder in which a piston can be displaced, the piston causing in turn a given water amount to be displaced toward the filter.

Abstract: A filter insert for containers, such as tea pots, where a specific dwelling time is required for the filter pulp in the liquid held in the container, the insert consisting of a circular cylindrical filter unit, extending downwards from the top of the container at to least below the surface of the liquid in the container when being filled, and where at least one plunger shaft with a plunger sliding in a plunger guide extends axially through the upper part of the insert.

Abstract: The machine is paired as concerns the receptacle (8-8') for the batched coffee and the piston (5) and (5') pressing such batches, and the ejector (12-12') in such a way that the pairing allows the machine to make one or two coffees at the same time and indeed three if one of the receptacles (8) or (8') has a double capacity and a double distribution outlet. Each seat or support (4) mounted also to turn with the main shaft (1) has a cavity in which a support (18) is positioned for a filter (19) through which the coffee infusion passes in each case. The angular separation in positioning the receptacles (8-8') is the same as for the pressing pistons (5-5') in order to allow the same to face the receptacles (8-8') simultaneously, the ejectors (12-12') for the cake (13) of used coffee being mounted with the same separation or spacing.

Abstract: A coffee maker having a heating device for heating water to the temperature necessary for producing a coffee drink. The coffee maker is equipped with an electrically powered pump for the delivery of water, with a bore being provided in the pump casing. Within the bore, a working piston reciprocates, its stroke determining a working chamber. The coffee maker is provided with a suction valve and a discharge valve, each including a valve closure body spring-loaded in the closing direction. The suction valve is opened by pressure below atmospheric and the discharge valve by pressure above atmospheric in the working chamber. The preparation of the coffee drink is accomplished by the pump drawing water through the suction valve and delivering it under pressure through the discharge valve to a brewing chamber adapted to be filled with coffee grinds from which it escapes following extraction.

Abstract: An apparatus for beverage brewing using heated liquid to infuse a beverage brewing substance during a brewing cycle. The apparatus includes a brew chamber which is positioned for communication with a reservoir having a filter positioned between the brew chamber and the reservoir. A quantity of beverage brewing substance is placed in the brew chamber and a quantity of heated water is placed in the reservoir. A pumping device pumps the water in the reservoir to the brew chamber to infuse the beverage brewing substance and produce a brewed beverage. The brewed beverage created in the brew chamber drains through the filter between the brew chamber and the reservoir and is captured by the reservoir. The brewed beverage and any remaining heated water are recirculated through the beverage brewing substance in the brew chamber for a period of time. At a desired period in the brewing cycle, a valve connected to the reservoir is operated to open the reservoir and drain the brewed beverage therefrom.

Abstract: An automatic coffee machine has a flow heater (1) for preparing hot water, a facility for feeding coffee powder into a percolator, consisting of a percolating chamber (14) formed by a stationary tube section (8) arranged with a vertical axis and two stoppers (12, 13) located at least partly within the flow heater (1), and an axial drive for moving the upper stopper (12) in the direction of the tube section (8) axis, a drive for moving the upper stopper (12) into the parked and stand-by positions relative to said axis, as well as a vertical drive for the lower stopper (13). The upper stopper (12) is mounted on a pivot arm (24) which can be pivoted about a bearing (25) which is fixed in position. The drive for moving the upper stopper (12) into the parked and stand-by positions is an actuator. The upper stopper (12) is constructed in one piece and can be moved in a sealing manner into the tube section (8), by means of the axial drive which is mounted on the pivot arm (24), to achieve the percolating position.

Abstract: A beverage brewing device which includes a supply of heated water. A receptacle for receiving the heated water has a first open end and a second open end. The receptacle is movable between a brewing position for receiving a beverage material through the first open end and a retracted position for discharging the beverage material through the second open end. The first open end of the receptacle is in fluid communication with the supply of heated water when the receptacle is in the brewing position. A base plate is positioned in facing relationship with the second end of the receptacle when the receptacle is in the brewing position. An outlet conduit is releasably secured to the base plate for allowing brewed beverage to flow from the receptacle through the outlet conduit. A filter assembly is fixed with respect to the outlet conduit and is sealingly disposed between the outlet conduit and second end of the receptacle when the receptacle is in the brewing position.

Abstract: The present invention provides a method for preparing coffee beverages in coffee machines wherein all of the residual water remaining between the boiler and the outlet is removed from the coffee machine between every two cycles of coffee beverage preparation. It also provides an apparatus for preparing coffee beverages comprising means for draining all of the residual water remaining between the boiler and the outlet from the coffee machine after each cycle of coffee beverage preparation. These measures secure that the residual water remaining in the apparatus after the brewing cycle is nearly completely drained from said apparatus. This guarantees that such a coffee machine prepares a beverage which meets the requirements of the user with respect to taste and temperature. Moreover, this beverage is impeccable as to its hygienic and microbiological condition.

Abstract: It comprises at least one unit formed by a piston and by a cylindrical chamber, as well as means for supplying with ground coffee and with hot water under pressure, and means for the automatic starting and stopping of the unit and its means of supply. The piston (2) is fixed and the chamber (11, 16) is movable, both arranged horizontally. The chamber is formed by two juxtaposed cylindrical parts, the first part (11) accommodating in rest position the head (3) of the piston (2) fitted with an annular seal (6), has a diameter smaller than the diameter of the seal (6). The second part (16) of the cylindrical chamber has an inner diameter smaller than the outer diameter of the seal (6) permitting sealed sliding. The first part (11) houses a free sleeve (10) the inner diameter of which is equal to the inner diameter of the second part (16) so as to protect the seal when the head (3) passes in front of a lateral opening (13) for supplying ground coffee.

Abstract: The brewing apparatus (2) comprises lateral guiding and holding plates (6, 7) for securing and guiding individual components thereof. A movable brewing piston (39) is guided in a cylindrical guideway (8) provided with an external thread (93). A nut (9) rotatable on the guideway has teeth (10) at its periphery and is moved on the guideway by a motor-driven, elongated gearwheel (11). Lateral guide arms (14, 15) engage the nut and the brewing piston and control the pivoting movement of a brewing cylinder (82). The brewing cylinder has two arms provided with teeth (86, 87), these arms co-operating with a drive part (26) for moving an ejection piston (107) in the brewing cylinder. The drive part for the ejection piston is designed in such a way that it travels only half as far as the ejection piston and thus allows the coffee machine to have less headroom.

Abstract: An improved funnel for a beverage brewer which provides that the water supplied to the brewer enters into the funnel and passes into the brewer chamber to slots formed in the funnel and shaped so as to prevent air being expelled from the brewer chamber from below from causing the water to splash outside of the funnel during the brewing cycle. Ledges are formed on the lower edges of the slots which act as platforms for the water to rinse away coffee grounds during the short wash cycle of the coffee brewer.

Abstract: An automatic coffee-making machine including a drive unit consisting of a direct-current motor having an output shaft provided with a worm screw actuating a sealed rod of a valve body and engaging with a slider movable linearly at a right angle to an axis of rotation of the motor shaft, a shaped member connected with the slider and receiving a free end of a rod of piston, and a device for monitoring and controlling the power input to motor, determining a start and an end of strokes of the piston during the phases of downward movement and compression of the powdered coffee.

Abstract: A machine for making coffee has a cylindrical chamber in which the head walls are made up of two pistons mounted on circulating ball screw actuators. Once the coffee powder is put into the chamber, the pistons are brought together to exert pressure, after which hot water is introduced to make the infusion. A motor for one of the actuators is in a lower casing on which the chamber is directly mounted for compact construction.

Abstract: A cylinder (3) is closed, on the one hand, by a cover (4) and, on the other hand, by a ferrule (5) traversed by a rotatable shaft (6). The cylinder (3) is so disposed as to close an infusion chamber (15) delimited by the cover and by a sliding piston (17) driven by a translatory drive (18) integral with the shaft. A jacket (19) is slidably mounted by an actuating device (20) connected to the shaft (6), the piston (17) is itself slidably mounted in the jacket (19), the different positions of the jacket and of the piston being defined relative to each other by a selector (35) of the number of rotations of the shaft. Application particularly for household coffeemaking machines.

Abstract: An apparatus for brewing beverages in portions, especially espresso coffee, comprises means (9-12) for dispensing ground coffee beans (14) to a coffee receiving means (1) as well as water feeding means (22, 42-45) for passing hot water through the coffee in the coffee receiving means (1) and further to a cup (48). The coffee receiving means (1) comprises a sleeve-shaped body (3) made of a resilient material, said body on the outside being supported by a substantially rigid supporting means (4) and on the inside between the ends being of a volume exceeding the measured amount of coffee powder (14). The water feeding means (22, 42-45) comprises a piston device (22), which during the feeding of water is adapted to simultaneously compress both the measured amount of coffee (14) and the sleeve-shaped body (3) in its axial direction, while the amount of coffee (14) and the sleeve-shaped body (3) at the opposite axial end are supported by a sieving means (17, 18) allowing passage of the brewed hot beverage.

Abstract: An automatic apparatus for the preparation of one or more servings of expresso coffee comprises a rotating board provided with through cylindrical holes which in a first position of rotation of the board are fed with a predetermined amount of fresh coffee grounds, which is also pressed, and by the rotation of the board are brought to an infusion position and lastly to a position of discharge of the coffee grounds.

Abstract: The automatic machine for the production of coffee and infusions according to this invention comprises a filter-carrying element having on the base a movable filter for the filtration of the infusion of coffee, into which element there can be sealingly inserted a piston equipped with means for the delivery of hot water under pressure supplied from a metering unit, in which the piston is carried by a transverse bar extending between two parallel side members of the machine and equipped with a pair of connecting rods adjacent to the lateral members and associated with elastic means for exerting tension on the piston and connected eccentrically to respective discs which can be rotatably actuated by a geared motor, there being present means for friction blocking of the piston in a lowered position in the filter-carrying element, these means determining the irreversible transmission of the movement from the motor to the piston, means being also present for the automatic expulsion of the exhausted infusion substanc

Abstract: The single driven part of the apparatus is an axially movable scalding cylinder, in which a piston is located which is free to move in the axial direction. This piston is positioned by a guide bush or moved with the scalding cylinder. A supporting block comprises, furthermore, an abutment for the disk of the piston. A second piston is arranged stationary or may be moved also axially against the force of a spring against a further supporting block. By the movement of the scalding cylinder ground coffee which has been inserted between the pistons is compressed and drinkable coffee is produced by feeding hot water thereto.

Abstract: An automatic machine for making coffee or a similar beverage includes an infusion chamber at atmospheric pressure and adapted to accommodate a mixture of liquid such as hot water and a material serving as the base of the beverage. The infusion chamber has at the bottom thereof a surface permeable to fluids and impermeable to the material. An extraction chamber is positioned below the bottom of the infusion chamber and communicates therewith through the surface. A first control mechanism is positioned within the extraction chamber for moving upwardly therein to force air through the surface into the mixture in the infusion chamber and for moving downwardly within the extraction chamber to extract beverage from the infusion chamber through the surface into the extraction chamber. A second control mechanism is provided within the extraction chamber for forcing beverage within the extraction chamber therefrom under pressure to a dispensing area.

Abstract: The automatic coffee-making machine according to the invention comprises a filter carrier having on its base a movable filter for filtering the coffee infusion, there being introducible into the carrier in sealing-tight manner a piston having means for delivering pressurized hot water supplied by a metering unit, the piston being operated for its movements of descent, introduction into the filter carrier element, compression of the coffee powder, raising and lateral rotation by a rod having resilient piston-pulling means and connected to a rotating disc actuated by a geared motor, means being provided to support and guide the piston in its movement, the latter means providing an irreversible transmission of the movement from the motor to the piston, automatic means being provided to expel the spent coffee powder and to supply fresh powder to the filter carrier.

Abstract: The invention provides a piston-cyclinder-assembly for a coffee brewing apparatus, the assembly comprising a cylindric cavity serving as a brewing chamber, a closing member mounted on the cylindric cavity at one end thereof, and a piston which can be displaced into and retracted from the brewing chamber at the other end. The piston is equipped with internal brewing water channels leading to the front face of the piston and connected to a brewing water connector. The closing member has plate-like shape and is fixed against movement in axial direction of the brewing chamber but is pivotally mounted near the cylindric cavity. To drive the piston into the cavity and to retract it, and to pivot the closing member, first and second stepping motors, respectively, are provided which are operatively connected to a control unit. Another embodiment is provided with a normal electric motor to drive the piston and with a pressure sensor.

Abstract: An apparatus for preparing "espresso" coffee in a household environment comprises a powder coffee metering dispenser assembly, a hot water dispenser assembly, an emptying device for the cup-like percolator movable along guide-forming means extending below said powder coffee metering dispenser assembly, said hot water dispenser assembly and said emptying device.

Abstract: A manually operated coffee-making machine comprises, water storage reservoir and a hand-operated pump element which extends into the interior of the reservoir. The pump element is actuatable from the exterior of the reservoir. The delivery side of the pumping element is connected to an infusion chamber assembly which accommodates the coffee powder and is in communication with a dispensing tap opening to the exterior of the reservoir. An hydraulic accummulator is also provided. This hydraulic accummulator branches off a conduit connecting the delivery side of the pumping element to the infusion chamber assembly.

Abstract: Apparatus and method of removing desirable constituents from an infusible material by infusion extraction, where a piston operating in a first chamber draws a solvent into the first chamber where it may be heated, and then moves the heated solvent into a second chamber containing the infusible material, and where infusion extraction takes place. The piston then moves the solvent containing the extract through a filter into the first chamber, leaving the extraction residue in the second chamber.