Classifications

• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
  • A47J31/00—Apparatus for making beverages
  • A47J31/22—Centrifuges for producing filtered coffee

Definitions

• Extraction-filtration device intended in particular for the preparation of coffee.
• a rotating centrifugation enclosure having a sharp edge at its periphery, is formed by two surfaces of revolution of different respective profiles.
• the device described comprises a hollow cone having its top turned upwards, applied to a flat lower support, during the rotation of the assembly.
• the present invention aims to provide a device for preparing good quality coffee while avoiding the drawbacks of the state of the art; the device of the invention also has the advantage of allowing very rapid production of ca ' fé and of being largely auto ⁇ matisable and in particular of being adaptable to automatic dispensers while allowing a priora ⁇ infusion coffee, before centrifugation.
• the invention therefore relates to a device in which a material to be extracted is brought into contact with an extraction liquid, after which the residue is separated from the liquid by filtration-centrifugation.
• filtration is carried out through the joint of a lower hollow volume of revolution and an upper obtu ⁇ ration element, driven in rotation so that rapid filtration is carried out by centrifugation.
• This procedure allows to introduce into the hollow volume of revolution, a metered amount of coffee or other material to be extracted with the extraction liquid preferably heated and to allow an infusion to take place before or simultaneously with filtration-centrifugation operation.
• Figure 1 shows a sectional view of a device according to the invention in the "closed" position, which corresponds to the different stages of coffee preparation
• Figure 2 is a view corresponding to that of Figure 1 of the device in the "open” position which corresponds to the position of cleaning and removal of the grounds
• Figure 3 shows a detailed sectional view of the locking mechanism of the device
• Figure 4 is a section at level IV-IV in the locking mechanism of Figure 3
• Figure 5 is a half-section at v-V of the mechanism of the sliding coupling of Figure 3
• 6 shows a sectional view corresponding to that of Figure 2, in which the grounds collection device is constituted by a volute and the device for raising and lowering the centrifuge consists of a drive to cams
• FIG. 1 shows a sectional view of a device according to the invention in the "closed" position, which corresponds to the different stages of coffee preparation
• Figure 2 is a view corresponding to that of Figure 1 of the device in the "open” position which corresponds to the position of
• FIG. 7 represents a section at level VII-VII of the filtration-evacuation assembly of the infusion of FIG. 6;
• Figure 8 shows a side view of a cam drive mechanism shown in section in Figure 6;
• FIG. 9 represents a sectional view along line IX-IX of FIG. 8.
• centrifugal filter which is composed of a hollow volume of revolution 1 having the shape of a cone and of an upper closure element 2 also having the shape of 'a cone, the two cones being opposite by their large base.
• the cone upper 2 carries an inlet strainer and can be lifted by pressing. on the mechanism 4 housed in the drive shaft, so as to pass from the closed position shown in FIG. 1 to the open position shown in Figure 2.
• vanes 5 are arranged radially to reduce the inertia of the liquid during startup while allowing a good distribution of the mixture of materials to be centrifuged, namely the mixture of water and ground coffee in the filter. In this way, we are assured of a good static and dynamic balancing during the centrifugation operation.
• a peripheral collector 6 is intended to receive the coffee separated by filtration of its marc and it is advantageously heated by a coil 7 connected to the water heater (not shown) of the device in thermo-siphon. This provision also allows immediate availability of very hot water to the solenoid valve 8 controlling the supply of hot water intended for the preparation of coffee.
• the device also includes an endless screw 23 connected to a container (not shown) which during the initial impul ⁇ sion brings a metered quantity of coffee which falls into the funnel 24.
• the solenoid valve 8 simultaneously allows passage enough hot water to entrain the ground coffee inside the filter.
• the mixture of coffee and water is allowed to infuse for some time and then, according to the form of execution of the invention, the two conical elements 1 and 2 are made to rotate constituting the essential element of the device d extraction-filtration at a speed of the order of, for example, 6000 revolutions / minute, with a view to centrifugation.
• a geared motor 10 drives a set of four screws 11 * synchronized by a crenellated belt 12.
• the action of the screws 11 on nuts 13 lowers the assembly constituted by the bearing 14 and the filter element formed by the cones 1 and 2 at a conical recovery chamber 15 intended to receive the grounds.
• the motor 16 for driving the filter as for the fluid in place and the rotation of the filter continues thanks to the sliding coupling 17.
• the filter passes from the position shown in FIG. 1 to the position shown in Figure 2. Arrived at the level of the conical recovery chamber 15 for the grounds, the locking mechanism 4 presses against the motor shaft 18 (see Figure 3), thus separating the cones 1 and 2.
• the locking device as it is shown in Figure 1 is constituted by a return spring 31 of the upper cone 2 which presses on the rear of the sleeve 32 secured to the rod 33 which by its other end is screwed to the upper cone 2 in order to hold the two cones 1 and 2 in the closed position as shown in FIG. 1.
• the threaded part of the rod at its end on the side of the cone 2, allows the spacing of the cones 1 and 2 to be adjusted. This spacing is given by the compression of the spring 31 resulting from the thrust ⁇ to the product to be filtered during the rotation of the two cones.
• a spring 35 pushes the lock 36 at the end of the sleeve 32.
• the cylindrical part 37 of the lock 36 wedges 3 balls 38 in the groove 39 against the hardened steel nozzle 40 and prevents the sleeve 32 from sliding.
• the ejection of the grounds is carried out through a volute whose base, from the beginning of the spiral , may be steeply sloping towards an exit.
• the centrifugal effect of the air sucked through a paddle wheel driven by the drive axis of the two cones ensures ejection of the marc when said cones open through the volute.
• FIGS. 6 and 7 it can be seen that the marc recovery system, namely the marc recovery manifold 15 with scrapers 20, has been replaced by a volute 115, the base of which is horizontal.
• the pallets 5 inside the filter 1 have been fashioned like blades, as shown in FIGS. 6 and 7.
• the conical elements may also include, at the joint, a lip preventing the backdraft of dry marc from the volute 115 towards the liquid collector 6 disposed above the latter.
• the volute 115 is of toroidal shape and has a rectangular section easy to manufacture by stamping. It can however also have the shape of a spiral.
• the gearmotor driving the crenellated belt and therefore also the screws can be replaced by a cam mechanism.
• a bearing 14 slides in a nozzle 125, the fixed upper part being supported by three rigid columns 130.
• the gearmotor 10 rotates the crank 126 which controls the articulated rod 127 connected to the pivot provided with a roller 128 secured to the bearing 14.
• a half turn of the crank 126 lowers the pivot-roller assembly in the groove of helical guidance 129 practiced in the nozzle 125 to the lowest point thereby causing the descent of the bearing 14 and of the conical elements.
• WIPO conical elements 1 and 2 and the locking are effec ⁇ killed according to the same operating mode as that of the embodiment of Figures 1 and 2.
• a second helical guide groove and a second roller are arranged at 180 °, as also shown in Figure 9.
• the guide grooves can end at the top and bottom by horizontal parts which keep the bearing 14 fixed relative to the axis while allowing its rotation during the movement of the connecting rod 127. These ends make it possible to mark the stop in the open position to facilitate the ejection of the grounds and ensure locking in the high position.
• the device described can find applications in sectors other than extraction-filtration of coffee.
• This device can be used for filtration and separation or even washing of all solid materials, the particle size of which must, of course, be chosen so as to be retained at the join ⁇ ture of the trays while the extracted liquid escapes by this join.
• Sectors given as an indication for an application of the device of the invention are in particular the chemical industry, the pharmaceutical industry and the food industry.
• the machine After the start pulse (switch, push-button, etc.), the machine starts and the coffee is dosed by worm screw 23 to prepare a cup of coffee; the device has been calibrated to deliver 7 g of coffee which falls into the funnel 24.
• start pulse switch, push-button, etc.
• the solenoid valve 8 allows hot water to pass which carries the coffee inside the filter.
• the temperature of this water is regulated between 80 and 90 ° C by conventional thermostatic devices.
• two adjustment buttons are provided either to prepare a "long coffee” in which case, approximately 150 ml of water are supplied, or to prepare a coffee type "espresso" in which case, approximately 100 ml of water are powered.
• the duration of this operation is of the order of approximately 3 seconds.
• the solenoid valve 8 is closed and for 10 seconds for example, the mixture of ground coffee and water is allowed to infuse.
• the filter namely the plates 1 and 2 are rotated.
• WIPO of course be chosen so â. that only liquid can be expelled by centrifugal force through the joint of the two cones after passing through the layer of ground coffee.
• the coffee drops are propelled into the collector 6 and exit through the pipe 9 towards the cup or the cup.
• the hot water contained in the heating coil 7 prevents cooling of the coffee produced.
• the duration of this operation can for example be of the order of 10 seconds.
• the next step consists in that the filter descends opposite the conical chamber 5.
• the two filter cones 1 and 2 separate and the marc is ⁇ j.ect ⁇ e and brought towards the orifice outlet 19 by scrapers 20, for example-

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• 1982
  • 1982-08-17 IT IT22880/82A patent/IT1152806B/it active
  • 1982-08-17 WO PCT/BE1982/000017 patent/WO1983000612A1/en not_active Application Discontinuation
  • 1982-08-17 ES ES515065A patent/ES515065A0/es active Granted
  • 1982-08-17 EP EP82902523A patent/EP0086802A1/fr not_active Withdrawn

Non-Patent Citations (1)

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