JP4136909B2 - Coffee extractor - Google Patents

Description

The present invention relates to a coffee extractor comprising a lower container for containing water and an upper container for containing coffee powder.

A known coffee siphon includes a lower container having an upper opening, an upper container having an upper opening and a water pipe hanging from the bottom, a filter member in the upper container for closing the water pipe, and an upper part A holding mechanism having a through passage between the container and the lower container so as to allow the water pipe to be extracted and a heating structure for heating the water stored in the lower container are provided (see Patent Document 1). . When the water stored in the lower container is heated and boiled, the water is filled in the lower container by this boiling, and the water vapor pressure in the lower container is increased. When the water vapor pressure exceeds the weight of the stored water, the water (hot water) is pushed up in the water pipe and passes through the filter member and flows into the upper container. The flowing hot water is mixed with coffee powder. When all the hot water in the lower container is pushed up, the heating of the heating structure is stopped or lowered, whereby the temperature of the lower container is lowered and the pressure in the lower container is lowered. Due to this pressure drop, hot water in the upper container whose pressure is higher than that of the lower container is pushed out and descends in the water pipe. When descending, only the coffee that has been filtered and extracted by the filter member is stored in the lower container.
Japanese Patent Laid-Open No. 7-148071 (see paragraphs 0002 to 0007, FIG. 1)

The coffee extracted in this way is delicious if you drink it immediately, but if the time from extraction to drinking is long, the coffee will oxidize during that time and the taste will drop. For example, after extracting five cups of coffee, two cups of coffee are drunk first, and the remaining three cups of coffee are drunk one by one at different times. The first two cups of coffee are delicious, but the later of the remaining three cups, the more oxidized and the taste of the coffee goes down. Most home-use coffee siphons have a capacity of several cups, but when used for business use, they have a capacity of more than a dozen cups or more. Therefore, especially for business use, the time from coffee extraction until the last cup is drastically increased. Everyone has the experience of being disappointed by the large coffee extractor and coffee left over in the pot in a cafeteria, office, railway vehicle, etc. The problem to be solved by the present invention is to provide a coffee extractor that can drink coffee deliciously by preventing the oxidation of coffee during the time from extraction to drinking. It is to provide .

  In order to solve the above-described problems, the inventor used an air (air) in the upper container containing coffee powder and an air in the lower container containing water to prevent deterioration gas such as nitrogen gas (non-deteriorating). We considered that oxidation could be prevented by replacing the active gas) and extracting the coffee in the deterioration-preventing gas atmosphere, and from that point of view, we developed the coffee extractor described below. For details, please refer to the section. It should be noted that the definitions of terms used to describe the invention described in any claim shall be applied to the invention described in other claims as long as possible in nature.

(Characteristics of the invention of claim 1)
A coffee extractor according to the invention described in claim 1 (hereinafter referred to as “the coffee extractor of claim 1” as appropriate) has an upper container having an upper opening and a water pipe hanging from the bottom, and the upper container has an upper container. A filter member that closes the water pipe, a lower container having an upper opening that can pass through the water pipe, and an airtight seal between the upper container and the lower container, and in the upper container and the lower container And a heating mechanism for heating the water stored in the lower container. The upper container has an upper lid capable of hermetically closing the upper opening, an upper air vent valve for venting air in the upper container, and an upper gas inlet for injecting deterioration preventing gas into the upper container. The lower container is provided with a lower air vent valve for venting the air in the lower container and a lower gas inlet for injecting a deterioration preventing gas into the lower container. Ah is, the holding mechanism, and a through passage which can pass through the water passage pipe, and tube seal structure of the water passage tube sampling possible airtight closure between the water passage pipe which is passed through with the through-passage peripheral wall, the An outlet valve that can be hermetically sealed at the outlet of the through passage, and the outlet valve is always kept closed by an urging structure and can be pushed down and opened by insertion of the water pipe, and is closed by extraction of the water pipe Can be restored to Thea Ru. For example, if an inert gas such as nitrogen gas is used as the deterioration preventing gas, it can be obtained at a relatively low cost and is easy to handle. The upper and lower air vent valves may be configured to be manually openable / closable, may be configured to be check valves that open when the pressure exceeds a predetermined pressure, or may be configured to be manually openable / closable check valves. It may be configured.

According to the coffee extractor of claim 1, the air in the upper container containing the coffee and the air in the lower container containing the water can be replaced with the deterioration preventing gas. That is, coffee extraction can be performed in an atmosphere of deterioration preventing gas. Specifically, the deterioration preventing gas is injected from the upper gas inlet to dilute the air in the upper container and increase the atmospheric pressure, and the increased air releases the diluted air from the upper air vent valve. Along with the release of air, further deterioration prevention gas is supplied, and a new release of air is performed by the supply. By repeating such a series of actions, the dilution of air proceeds and the air in the upper container is replaced with the deterioration preventing gas. The air in the lower container is also replaced with the deterioration preventing gas by the same action as in the upper container. The heating structure heats and boils the water in the lower container. Boiling fills the lower container with water vapor and raises the water vapor pressure in the lower container. When the water vapor pressure exceeds the weight of the stored water, the water (hot water) is pushed up in the water pipe and passes through the filter member and flows into the upper container. The flowing hot water is mixed with coffee powder. When all the hot water in the lower container is pushed up, the heating is stopped or the pressure in the lower container is lowered due to the lowering of the heating temperature. When descending, only the coffee that has been filtered and extracted by the filter member is stored in the lower container. At this time, since the inside of the upper container and the lower container are in a deterioration-preventing gas atmosphere, there is no contact between the coffee and the air during the extraction and after the extraction, the oxidation of the coffee is prevented, especially after the extraction. There is no loss of taste due to oxidation of coffee over time .

Further, the upper container can be extracted from the lower container in which the extracted coffee is stored, and the coffee can be prevented from being oxidized even after being extracted. In other words, when inserting the water pipe of the upper container through the holding mechanism and inserting it into the lower container, the water pipe is penetrated through the through passage against the tube seal structure, and further the biased structure is formed at the outlet of the through passage. The outlet valve is pushed down and opened against the urging force. Even if the outlet valve is opened, the tube seal structure functions and the airtightness in the lower container is maintained. On the other hand, in order to extract the water pipe, the upper container is pulled up and the water pipe is retracted from the lower container. When the lower end of the retreated water pipe enters the through passage, the through passage outlet is hermetically sealed by the biasing force of the biasing structure. Until the outlet valve hermetically seals the outlet of the through passage, the tube seal structure keeps the airtightness in the lower container, and after closing, the outlet valve keeps the airtightness instead of the tube seal structure. Here, when the upper container is further pulled up, the water pipe is eventually separated from the pipe seal structure, and the water pipe can be removed from the lower container.

(Characteristics of the invention described in claim 2 )
The coffee extractor according to the invention of claim 2 (hereinafter referred to as “the coffee extractor of claim 2 ” as appropriate) is the coffee extractor of claim 1 , wherein the lower container is for extracting stored coffee. Has a sampling valve.

According to the coffee extractor of claim 2 , in addition to the effect of the coffee extractor of claim 1, by having the extraction valve, the stored coffee can be extracted without tilting or inverting the lower container. . Furthermore, when extracting a small amount at a time, when the extraction valve is opened, the coffee is pushed out by the deterioration preventing gas injected from the lower gas inlet. When the required amount is extracted, the remaining coffee can be continuously stored in the lower container by closing the extraction valve. Even if the coffee is extracted, only the deterioration preventing gas and not air is injected into the lower container, so that the remaining coffee is not oxidized.

(Characteristics of Claim 3 )
A coffee extractor according to the invention described in claim 3 (hereinafter referred to as “the coffee extractor of claim 3 ” as appropriate) is the coffee extractor according to claim 1 or 2 , wherein the upper container is rotated. An agitating blade attached to the lower end of the shaft is arranged, and the rotating shaft is supported by an airtight bearing provided on the upper lid and can be operated from the outside.

According to the coffee extractor of claim 3 , in addition to the effects of the coffee extractor of claim 1 or 2 , the mixing of the hot water and coffee powder that has flowed into the upper container by rotating the stirring blade is efficiently performed. It can be carried out. The stirring blades can be rotated manually, but there is also a motor rotation method. Since the rotating shaft is supported by an airtight bearing, the airtightness of the upper container is not impaired.

(Feature of the invention of claim 4 )
The coffee extractor according to the invention of claim 4 (hereinafter referred to as “the coffee extractor of claim 4 ” as appropriate) is the coffee extractor of claim 1, wherein the holding mechanism includes the upper container and the lower part. It is formed integrally with the container. That is, the upper container and the lower container cannot be separated.

According to the coffee extractor of claim 4 , in addition to the operational effect of the coffee extractor of claim 1, since the holding mechanism is formed integrally with the upper container and the lower container, the holding mechanism has a simple structure. Can do. That is, for example, a packing or the like is used for the seal structure between the upper container and the lower container, but it is possible to maintain airtightness without using this packing or the like. Since a member such as packing is unnecessary, the holding mechanism can be simplified.

(Feature of the invention of claim 5 )
A coffee extractor according to the invention described in claim 5 (hereinafter referred to as “the coffee extractor of claim 5 ” as appropriate) is the coffee extractor according to any one of claims 1 to 4 , and mounts the lower container. A gas cylinder for supplying a deterioration preventing gas is detachably provided on the base part.

According to the coffee extractor of claim 5 , since the components of the coffee extractor including the gas cylinder are integrated in addition to the operational effects of the coffee extractor of any of claims 1 to 4, it is very convenient to carry. . It is even more convenient to have a handle or handle for carrying the whole.

  According to the coffee extractor and the coffee extraction method according to the present invention, even if the time from extraction to drinking becomes long, it is possible to drink coffee deliciously by preventing the oxidation of coffee during that time. it can. Therefore, not only for home use, but also in a cafeteria, office, railway vehicle, etc., even a large coffee extractor or leftover coffee in a pot can be drunk.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of the coffee extractor, and FIG. 2 is a right side view of the coffee extractor shown in FIG. 3 and 4 are partially enlarged views of the coffee extractor shown in FIG. FIG. 5 is a longitudinal sectional view showing a first modification of the present embodiment. FIG. 6 is a longitudinal sectional view showing a second modification of the present embodiment. FIG. 7 is a longitudinal sectional view showing a third modification of the present embodiment.

(Schematic structure of coffee extractor)
This will be described with reference to FIGS. The coffee extractor 1 includes a base part 3 configured to be placed on a table or a wagon, etc., not shown, and an extractor body 5 and a gas cylinder 7 that are detachably attached to the base part 3. It is. Handles 6 and 6 for fixing the entire coffee extractor 1 are fixed to the extractor body 5. Further, a heater (heating structure) 9 is provided under the extractor body 5. The coffee extractor 1 is a device that performs coffee extraction using a so-called siphon principle. A regulator 7b is connected to the gas cylinder 7 via a supply valve 7a, and nitrogen gas (deterioration preventing gas) can be supplied from the regulator 7b to injection valves 22 and 60 described later. Reference numeral 7c denotes an opening / closing knob for opening and closing the supply valve 7a, and reference numeral 7m denotes a pressure gauge indicating the pressure of nitrogen gas. The optimum pressure of nitrogen gas is still under experiment, but this time it is set to around 1.002 MPa.

(Extractor body structure)
This will be described with reference to FIGS. The extractor body 5 is generally constituted by a lower container 11, an upper container 51, and a holding mechanism 31 that can hold the upper container 51 on the lower container 11. The lower container 11 is a substantially cylindrical container composed of a substantially circular bottom 12, a side wall 13 rising from the periphery of the bottom 12, and a ceiling 14 at the upper end of the side wall 13. The upper opening 15 is formed in the center part by forming 14 in donut shape. The ceiling portion 14 is provided with an injection valve 22 for injecting deterioration preventing gas, an air vent valve 23 and a purge valve 24. The injection valve 22 is a valve for injecting nitrogen gas (deterioration preventing gas) supplied from the gas cylinder 7 into the lower container 11. The air vent valve 23 is a valve that can be manually opened and closed. The purge valve 24 is a safety valve for opening and lowering the pressure to an appropriate value when the pressure in the lower container 11 rises above a predetermined value for some reason. An annular groove 17 having a semicircular cross section surrounding the upper opening 15 is formed on the upper surface side of the ceiling portion 14, and an annular packing 18 is fitted in the annular groove 17. The annular packing 18 is formed in a substantially circular cross section, and is formed so that the upper one-sixth of the annular shape protrudes from the upper surface of the ceiling portion 14 when the annular packing 18 is inserted into the annular groove 17. The lower container 11 is entirely made of stainless steel, but may be made of metal other than stainless steel, glass, or the like.

  The holding mechanism 31 includes a holding base 32 placed on the upper surface of the ceiling part 14 of the lower container 11 and a holding part 41 placed on the holding base 32. The holding base 32 has an annular flange portion 33 whose lower surface can be disposed in close contact with the upper surface of the ceiling portion 14 via the packing 18, an annular standing portion 34 that rises from the inner periphery of the flange portion 33, and the flange portion 33. It is comprised from the cyclic | annular hanging part 35 hanging down from the inner periphery of this, the hollow part 37 enclosed by the hanging part 35, and the cyclic | annular step part 36 formed in the upper end of the hanging part 35. As shown in FIG. The flange portion 33 is configured so that the entire holding base 32 can be screwed to the ceiling portion 14, and an annular groove 38 for inserting an annular packing 39 is formed on the upper surface of the step portion 36. Furthermore, the outer dimension of the drooping portion 35 is set slightly smaller than the outer diameter (the inner diameter of the peripheral edge) of the upper opening 15. This is because the hanging portion 35 is fitted into the upper opening 15 so as to ensure the positioning of the holding base 32 with respect to the ceiling portion 14 and to prevent displacement. The holding base 32 is made of stainless steel, but may be made of metal other than stainless steel, synthetic resin, or the like. The same applies to the holding unit 41 described below.

  The holding portion 41 includes a columnar holding portion main body 43 having a through-passage 42 and an annular flange portion 44 protruding in a radial direction from the approximate center of the outer peripheral surface of the holding portion main body 43. The outer diameter of the flange portion 44 is set to be substantially the same as the outer diameter of the standing portion 34 of the holding base 32, and the projecting dimension of the flange portion 44 is set to be substantially the same as the thickness dimension of the standing portion 34. is there. In the holding portion 41 configured as described above, the flange portion 44 rests on the upper end of the upright portion 34, the holding portion main body 43 below the flange portion 44 fits into the upright portion 34, and the holding portion main body 43. Since the lower end of the base plate is placed on the upper surface of the stepped portion 36, it can be stably attached to the holding base 32. The flange portion 44 is configured to be screwed to the upper end of the upright portion 34.

  As shown in FIG. 4, the through-passage 42 of the holding portion 41 is composed of a large-diameter through-passage 42a and a small-diameter through-passage 42f located at the lower end of the large-diameter through-passage 42a. The large-diameter through passage 42a is formed in a shape similar to a bobbin provided with inclined portions 42b and 42c by providing an inclination on the upper and lower peripheral walls. A packing 45 serving as a seal structure is attached to the peripheral wall of the small diameter through passage 42f. The packing 45 is a thick rubber ring, and its hollow portion is configured such that a water pipe 55 described later can be pushed in. That is, the role of the packing 45 is that the water pipe 55 can be pushed in and removed, and when it is pushed in, an air-tight chain is formed between the water pipe 55 and the small-diameter through passage 42f. A rubber pad 46 is attached to the lower end surface of the holding portion main body 43 so as to surround the outlet of the small-diameter through passage 42f. The rubber pad 46 includes a donut-shaped top plate 46a having a circular hole 46h communicating with the small-diameter through passage 42f, a cylindrical wall portion 46b hanging from the periphery of the top plate 46a, and a radial direction from the lower end of the wall portion 46b. It is comprised from the flange part 46c which spreads. The rubber pad 46 is screwed to the lower end surface of the holding portion main body 43 together with a washer 46w having substantially the same shape as the top plate 46a. The flange portion 46c in a free state is formed in a skirt shape that is gently inclined. This is because a flange portion 46c that comes into contact with an outlet valve, which will be described later, is elastically deformed to increase the contact area with the outlet valve, and the airtightness between the outlet valve and the outlet valve is more reliably maintained.

  Reference numeral 47 shown in FIGS. 3 and 4 denotes an outlet valve. The outlet valve 47 is configured to be openable and closable with respect to the rubber pad 46. As described above, the outlet valve 47 is in close contact with the rubber pad 46 when closed, and the inside of the lower container 11 via the upper opening 15 and the small-diameter through passage 42f. And in other words, has a role of hermetically sealing the inside of the lower container 11 from the outside. The outlet valve 47 is composed of a valve body 47a of a circular stainless steel plate having an outer diameter slightly larger than the outer diameter of the flange portion 46c of the rubber pad 46, and a rectangular attachment portion 47b protruding from the outer periphery of the valve body 47a. It is formed in a shape similar to The attachment portion 47b is formed with a hinge structure with the pin 35b as an axis between the attachment portion 35a fixed to the lower end surface of the holding portion 41 with a screw, and a torsion coil spring 35c is wound around the pin 35b. The torsion coil spring 35c constitutes a part of a biasing structure that biases the outlet valve 47 in the closing direction.

  The upper container 51 will be described with reference to FIGS. The upper container 51 includes a glass container main body 53 having an upper opening 52, and a water conduit 55 that hangs down from the bottom 54 of the container main body 53. The water pipe 55 is made of glass integrally formed with the container main body 53 until halfway, but its tip is made of metal for reinforcement. As shown in FIGS. 1 and 2, the water pipe 55 is set to a length that can reach only a slight gap between the water pipe 55 and the upper surface of the bottom 12 of the lower container 11 during coffee extraction. A rubber seal 57 is provided from the outer peripheral surface of the bottom 54 to the upper outer peripheral surface of the water conduit 55. The rubber seal 57 includes a dish-shaped part 57a that is in close contact with the outer peripheral surface of the bottom part 54, fold parts 57b and 57b that extend radially from the dish-shaped part 57a, and a cylindrical seal that hangs down from the dish-shaped part 57a and wraps the water conduit 55. It comprises a main body 57c and retaining protrusions 57d provided at predetermined intervals in the circumferential direction from the outer peripheral surface of the lower end of the seal main body 57c. The rubber seal 57 is formed in a size that can be inserted into the large-diameter through passage 42a of the holding portion 41 from above, and the lower end surface of the dish-like portion 57a and the fold portions 57b and 57b are inclined portions when inserted. 42b, and the retaining projections 57d,... Enter the inclined portion 42c so that the holding portion 41 can hold the upper container 51 firmly.

The upper container 51 has an upper lid 59 that can be placed on the upper container 51 and the upper opening 53 can be hermetically sealed.
The upper lid 59 is pressed against and fixed to the upper container 51 by lock mechanisms 6a and 6a provided on the handles 6 and 6, respectively. The upper lid 59 is provided with an injection valve 60 for injecting deterioration preventing gas, an air vent valve 61 and a purge valve 62. The injection valve 60 is a valve for injecting nitrogen gas (deterioration preventing gas) supplied from the gas cylinder 7 into the upper container 51. The air vent valve 61 is a valve that can be manually opened and closed. The purge valve 62 is a safety valve for opening and lowering the pressure to an appropriate value when the pressure in the upper container 51 rises above a predetermined value for some reason. The upper lid 59 is further provided with an airtight bearing 66, and a rotary shaft 67 is rotatably supported by the airtight bearing 66. A stirring blade 68 and a handle 69 positioned outside the upper container 51 are integrally attached to the lower end of the rotating shaft 67 positioned in the upper container 51. The stirring blade 68 is for operating the rotating shaft 67 from the outside and rotating it so that the hot water flowing into the upper container 51 is well mixed with the coffee powder C (see FIG. 3). Reference numeral 65 denotes a filter member that is in the upper container 51 and closes the water pipe 55.

(Coffee extraction method)
A coffee extraction method using the coffee extractor 1 will be described with reference to FIGS. First, the water conduit 55 of the upper container 51 is inserted into the through passage 42 of the holding portion 41. The tip of the water flow pipe 55 passes through the hollow portion of the packing 45 against the urging force of the torsion coil spring 35c and pushes down the outlet valve 47 at the outlet thereof. Thereby, the inside of the lower container 11 communicates with the inside of the upper container 51 through the water pipe 55. Here, when a predetermined amount of water is put into the upper container 51, the water descends the water pipe 55 and is stored in the lower container 11. Next, after putting the filter member 65 in the upper container 51 and closing the inlet of the water pipe 55, a predetermined amount of coffee powder C (see FIG. 3) is put thereon. When the coffee powder C is put in, the upper opening 52 is closed by the upper lid 59, and is pressed and fixed by the lock mechanisms 6a and 6a. In this state, it is hermetically sealed from the lower container 11 through the water pipe 55 to the upper container 51. When the closing is completed, the air vent valve 23 and the air vent valve 61 are opened, the injection valve 22 and the injection valve 60 are opened, and nitrogen gas is injected from the gas cylinder 7. The injected nitrogen gas fills the lower container 11 and the upper container 51, and mixes with the air therein to form dilution air. The diluted air is expelled from the air vent valve 23 and the air vent valve 61 by the following nitrogen gas, and the nitrogen gas mixing rate of the diluted air increases, and eventually the diluted air becomes only nitrogen gas. Therefore, the air vent valve 23 and the air vent valve 61 are closed. As a result of the closing, the passage from the lower container 11 through the water pipe 55 to the upper container 51 is again hermetically sealed, and the air therein is replaced with nitrogen gas.

  The heater 9 is turned on to heat the water stored in the lower container 11. As heating proceeds, water boils, and the generated water vapor raises the atmospheric pressure (water vapor pressure) in the lower container 11. When the water vapor pressure exceeds the weight of the stored water, the water (hot water) is pushed up in the water flow pipe 55 and passes through the filter member 65 and flows into the upper container 51. At this time, the pressure in the upper container 51 rises, but such an increase in pressure is within the allowable range of the upper container 51 and does not affect the airtightness. If the pressure exceeds a predetermined value, the purge valve 62 is actuated to release the nitrogen gas in the upper container 51 and reduce the pressure value. The flowing hot water is mixed with the coffee powder C (see FIG. 3). The stirring blade 68 is rotated by operating the handle 69 so that the coffee powder C is easily mixed. When the heater 9 is turned off when all the hot water in the lower container 11 is pushed up, the pressure in the lower container 11 decreases, and this time the hot water in the upper container 51 descends in the water pipe 55. When descending, only the coffee that has been filtered and extracted by the filter member 65 is stored in the lower container 11. At this time, since the inside of the upper container 51 and the lower container 11 is in a nitrogen gas atmosphere, there is no contact between the coffee and the air during the extraction, so that the coffee is prevented from being oxidized. The coffee in the lower container 11 can be extracted by opening the extraction valve 20, and this extraction is realized by the nitrogen gas injected from the injection valve 22 pushing out the coffee. Therefore, air does not enter the lower container 11.

  The upper container 51 is not directly related to coffee removal, and may be left as it is, but may be removed for convenience of carrying the coffee extractor 1 and the like. That is, when the upper container 51 is lifted, the water pipe 55 is also moved upward. At this time, the outlet valve 47 whose lower end of the water conduit 55 has been pushed down moves in the closing direction as the lower end rises. This closing operation is due to the biasing force of the torsion coil spring 35c. During the movement of the water pipe 55, the packing 45 keeps the airtightness in the lower container 11. When the lower end of the water pipe 55 completely enters the through passage 42, the outlet valve 47 comes into close contact with the rubber pad 46 and hermetically seals the inside of the lower container 11. Therefore, even if the airtightness between the packing 45 and the watertight pipe 55 is released, the airtightness in the lower container 11 is not affected. When the water pipe 55 is pulled out, the removal of the upper container 51 from the lower container 11 is completed. As described above, the coffee in the lower container 11 can be extracted by opening the extraction valve 20.

  The inventors conducted an experiment comparing drinking of coffee extracted using the coffee extractor 1. There are 10 subjects. Assuming that the taste of coffee is 5 as soon as it is extracted and the taste decreases as the number decreases, the taste of the coffee after 5 hours has been declared 5 for all 10 subjects. That is, it was replied that the taste of coffee after 5 hours of extraction did not feel a difference from the taste of coffee just after extraction. Furthermore, after 8 hours, 9 out of 10 subjects declared the coffee taste 5 and only the remaining 1 declared 4. Furthermore, after 12 hours, only two subjects, including those who declared 4 earlier, declared 4 and the remaining 8 still declared 5. Thus, according to this experiment, the coffee extracted by the coffee extractor 1 shows that 90% of the subjects do not feel any deterioration in taste within 12 hours after the extraction, and 10% of the subjects slightly I knew it was just a fall.

(Modification of this embodiment)
Based on FIGS. 5 to 7, first to third modifications of the present embodiment will be described. The coffee extractor according to any modification is not different in principle from the coffee extractor described above, and the difference is the shape of each member or component. Therefore, in the following description, about the part which is common with the coffee extractor 1 of this embodiment, the code | symbol same as the code | symbol used by description of this embodiment is attached | subjected to a quote drawing as needed, and the possible range In FIG. 5, those descriptions are omitted, and only different portions are described.

(First modification of this embodiment)
This will be described with reference to FIG. The coffee extractor 71 has a lower container 74 disposed on the base portion 73 and an upper container 75 detachably attached on the lower container 74. On the periphery of the upper opening 77 of the lower container 74, a peripheral part 78 formed in a mortar shape toward the inside of the lower container 74 is formed. A hollow rubber packing 79 is fitted into the peripheral portion 78 so as to be able to be extracted, and a water pipe 76 hanging from the bottom of the upper container 75 is inserted into the hollow portion of the packing 79. The upper opening of the upper container 75 is hermetically sealed by the upper lid 59. The coffee extractor 71 is different from the coffee extractor 1 in that the latter is configured such that the upper container can be extracted while maintaining airtightness after coffee extraction, whereas the former is used without extracting the upper container. It is the point comprised as follows. Extraction of the upper container 75 in the case of the coffee extractor 71 is performed for cleaning after use.

(Second modification of this embodiment)
This will be described with reference to FIG. The coffee extractor 81 has a lower container 84 disposed on the base portion 83 and an upper container 85 attached on the lower container 84. The lower container 84 does not have a top plate, and the entire upper end is an upper opening 87. At the periphery of the upper opening 87, that is, at the upper end of the peripheral wall of the lower container 84, an annular peripheral portion 88 that protrudes inward of the lower container 84 is formed. A ring-shaped rubber packing 89 is attached to the peripheral edge portion 88, and the bottom surface of the bottom portion 85 a of the upper container 85 can be placed in close contact with the top surface of the packing 89. The placed upper container 85 can be locked to the lower container 84 by the lock mechanisms 82 and 82. The upper opening of the upper container 85 is hermetically sealed by the upper lid 59. Like the coffee extractor 71 described above, the coffee extractor 81 does not remove the upper container during use, but the upper opening 87 of the former lower container 84 is the upper opening of the latter lower container 74. Since the opening area is larger than 77, the cleaning member and the hand can be easily put into the lower container, so that cleaning can be performed more easily.

(Third Modification of this Embodiment)
This will be described with reference to FIG. The coffee extractor 91 has a structure in which the upper container and the lower container of the coffee extractor 71 according to the first modification are integrated. That is, in the coffee extractor 91, the lower container 94 and the upper container 95 disposed on the base portion 93 are integrated, and a partition wall 92 is partitioned between the two. The partition wall 92 is formed with an annular peripheral edge 98 protruding inward of the lower container 94 at the periphery of the upper opening 97 of the lower container 94, and the upper opening 97 is hermetically sealed in the peripheral edge 98. A rubber packing 99 is attached. The upper opening of the upper container 95 is hermetically sealed by the upper lid 59. The packing 99 can be omitted, and the partition wall 92 and the water pipe 96 can be integrated instead.

It is a front view of a coffee extractor. It is a right view of the coffee extractor shown in FIG. It is the elements on larger scale of the coffee extractor shown in FIG. It is the elements on larger scale of the coffee extractor shown in FIG. It is a longitudinal cross-sectional view which shows the 1st modification of this embodiment. It is a longitudinal cross-sectional view which shows the 2nd modification of this embodiment. It is a longitudinal cross-sectional view which shows the 3rd modification of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Coffee extractor 3 Base part 5 Extractor main body 6 Handle 6a Lock mechanism 7 Gas cylinder 7a Supply valve 7b Regulator 7c Opening / closing knob 7m Pressure gauge 9 Heater (heating structure)
DESCRIPTION OF SYMBOLS 11 Lower container 12 Bottom part 13 Side wall part 14 Ceiling part 15 Upper opening 17 Annular groove 18 Packing 20 Extraction valve 22 Injection valve 23 Air vent valve 24 Purge valve 31 Holding mechanism 32 Holding base 33 Flange part 34 Standing part 35 Hanging part 35a Attachment Tool 35b Pin 35c Torsion coil spring 36 Step part 37 Hollow part 38 Annular groove 39 Packing 41 Holding part 42 Through path 42a Large diameter through path 42f Small diameter through path 42b Inclined part 42c Inclined part 43 Holding part main body 44 Flange part 45 Packing 46 Rubber pad 46a Top plate 46b Wall portion 46c Flange portion 46h Circular hole 46w Washer 47 Outlet valve 47a Valve main body 47b Mounting portion 51 Upper container 52 Upper opening 53 Container main body 54 Bottom portion 55 Water pipe 57 Rubber seal 57a Dish-shaped portion 57b Crest portion 57 Seal body 57d Retaining projection 59 Upper lid 60 Injection valve 61 Air vent valve 62 Purge valve 65 Filter member 66 Airtight bearing 67 Rotating shaft 68 Stirrer blade 69 Handle 71 Coffee extractor 73 Base part 74 Lower container 75 Upper container 76 Water pipe 77 Upper part Opening 78 Peripheral part 79 Packing 81 Coffee extractor 82 Lock mechanism 83 Base part 84 Lower container 85 Upper container 85a Bottom part 86 Water pipe 87 Upper opening 88 Peripheral part 89 Packing 91 Coffee extractor 92 Partition wall 93 Base part 94 Lower container 95 Upper part Container 96 Water pipe 97 Upper opening 98 Edge 99 Packing

Claims (5)

An upper container having an upper opening and a water pipe hanging from the bottom;
A filter member in the upper container for closing the water pipe;
A lower container having an upper opening capable of penetrating the water pipe;
A holding mechanism that hermetically seals between the upper container and the lower container so that the inside of the upper container and the inside of the lower container can be communicated only by the water pipe;
A heating structure for heating the water stored in the lower container,
The upper container has an upper lid capable of hermetically closing the upper opening, an upper air vent valve for venting air in the upper container, and an upper gas inlet for injecting deterioration preventing gas into the upper container. , And
The said lower container, and the lower air vent valve for venting the air of the lower container, Ri Oh provided a lower gas inlet for injecting a degradation prevention gas to the lower vessel,
A pipe seal structure in which the holding mechanism is hermetically sealed so that the water pipe can be extracted between a through path that can penetrate the water pipe and the water pipe that penetrates the peripheral wall of the through path; and An outlet valve capable of hermetically closing the outlet,
The coffee extraction is characterized in that the outlet valve is always held closed by an urging structure, can be pushed down and opened by inserting the water pipe, and can be returned to the closed state by extracting the water pipe. vessel. It said lower container, coffee extractor according to claim 1, characterized in that it has a sampling valve for extracting the storage of coffee. A stirring blade attached to the lower end of the rotating shaft is disposed in the upper container, and the rotating shaft is supported by an airtight bearing provided on the upper lid and can be operated from the outside. The coffee extractor according to claim 1 or 2 . The coffee extractor according to claim 1, wherein the holding mechanism is formed integrally with the upper container and the lower container. Including a base for placing the lower container;
The coffee extractor according to any one of claims 1 to 4 , wherein a gas cylinder for supplying the deterioration preventing gas is detachably provided to the base portion.

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