JPS6141207B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention comprises a pulverizing body for pulverizing raw materials such as coffee beans, and a filter at the bottom for accommodating the raw material powder pulverized by the pulverizing body. The present invention relates to an improvement in a coffee brewer having a basket and a hot water supply device for supplying hot water into the basket.

Generally speaking, one of the conditions for obtaining a delicious coffee extract with a rich flavor is to ``immediately pour boiling water over the coffee beans and filter them after grinding.'' Therefore, in order to satisfy the above conditions, coffee boilers have been proposed that have both a mill function for grinding coffee beans and a drip function for supplying hot water to the ground coffee powder. was.

Next, an example of such a conventional coffee brewer will be explained based on FIG. 1. FIG. 1 is a cross-sectional view showing the structure of a conventional coffee boiler, which has a roughly oval base that is easy to carry by hand. plates a and b
A base container 2 divided by is placed. Reference numeral 3 denotes a drive motor, which is vertically held between the partition plate a of the base container 2 and the base top plate c by elastic members 4, 4 such as rubber, in the center of the base. A joint 6 attached to the rotating shaft 5 of the motor 3 extends upward from an insertion hole d formed in the shaft.

Reference numeral 7 denotes a basket, which is composed of an upper basket 8, a lower basket 9, and an inner basket lid 10, as shown in FIG. This upper basket 8 is formed in a cylindrical shape,
A step 11 and a protrusion 12 are provided on the outer peripheral wall at the lower end. The lower basket 9 is formed into a cylindrical shape with a bottom, has a bottom surface 14 that slopes downward toward the spout 13, and has a through hole 15 through which the rotating shaft 5 of the motor 3 passes. The inner peripheral wall of the upper end of the lower basket 9 is provided with a protrusion 16 and a step 17 that fit into a recess formed by the step 11 and the protrusion 12 of the upper basket 8. The outer periphery 18 of the upper basket 8 is held between the lower end surface of the upper basket 8 and the stepped portion 17 of the lower basket 9. On the other hand, the outer periphery 1 of this basket inner lid 10
8 has a cylindrical portion 19 protruding toward the upper basket 8 side.
is provided and is adapted to fit with the upper basket and serve as a guide when assembling the basket 7. At the center of the basket inner lid 10, a crushing body 20 formed of a cutter or the like having an L-shaped end for crushing coffee beans is removably supported, and a motor 3 is attached at the lower end.
A joint 21 is inserted into and fitted into a joint 6 attached to a rotating shaft 5 to transmit driving force, and is rotatably supported by a central shaft cylinder 22. Between the central barrel 22 and the outer barrel 23 and the inner basket lid 1
A filter 24 is welded to the inner wall of the outer peripheral portion 18 of the pulverizer 20 and is fixed so as to be located at the lower part of the pulverizer 20 .

This filter 24 has a mesh of about 180 meshes made of stainless steel wire. A basket lid 25 is removably attached to the upper opening of the basket 7, and the basket lid 25 is provided with a hot water saucer 26 and a plurality of small holes 27, 27 in the center thereof.

In FIG. 1, 28 is a glass container,
It is arranged close to the side surface of the motor 3, and a peripheral socket 30 formed by the glass container 28 and the glass lid 29 is placed below so as to face the spout 13 of the basket 7. . The glass container 28 is provided with a handle 31 for convenient handling. A heating element 33 is provided on the lower surface of the glass container 28 via a heat insulating plate 32.
is located. A sheathed heater 34 and a heating pipe 35 are included in the heating body 33.
One end of this heating pipe 35 is communicated with the lower end of a water storage tank 36 attached to the base 1 via a check valve 37, and the other end is connected to a water heater. This hot water supply apparatus has a hot water supply pipe 39 having an arm structure and having an opening 38 facing the upper surface of the hot water receptacle 26 of the basket 7. Upper lids 40 and 41 are provided on the upper surfaces of the water storage tank 36 and the water heater, respectively.

Next, an example of a drive circuit for the above-mentioned motor 3 and sheathed heater 34 will be explained based on FIG. 3. In the figure, 42 and 43 are power terminals connected to a single-phase AC power supply, 44 is a power switch, and 45 is a changeover switch forming an operating section, which includes a movable contact _T1 and a fixed contact. _T2 , _T3
It has 46 is a safety switch,
The contacts are closed only when the aforementioned basket 7 is inserted into the main body and the lid 41 is securely closed. Further, TH is a temperature control thermostat placed at the outer bottom of the heating element 33. Due to these elements, the contacts T ₁ and T ₂ of the power switch 44 and the changeover switch 45 are connected between the power terminals 42 and 43.
- motor 3 - series circuit of safety switch 46, power switch 44 - contact piece of changeover switch 45
A series circuit consisting of T ₁ , T ₃ - sheathed heater 34 - temperature control thermostat TH is formed.

Next, the operation of the coffee brewer configured as described above will be explained. First, a predetermined amount of water is supplied into the water storage tank 36, a predetermined amount of raw material coffee beans is put into the basket 7, the basket lid 25 is closed, and the coffee brewer is placed on the main body. Joint 2 of the crushed body 20 of
1 is engaged with the joint 6 of the motor 3. and,
When the opening 38 of the hot water pipe 39 is set to face the hot water tray 26 and the lid 41 is closed, the safety switch 46 is closed. And glass lid 2
The glass container 28 in which the cassettes 9 are set is placed on the heat insulating plate 32 and positioned so that the socket 30 of the glass container 28 and the spout 13 of the basket 7 face each other.

In such a state, after closing the power switch 44, the contact piece of the changeover switch 45 of the operation section
When the gap between T ₁ and T ₂ is closed, the motor 3 is energized, the rotational force of the motor 3 is transmitted to the crushing body 20 via the joint 6 and the joint 21, and the crushing body 20
By the rotation of the coffee beans in the basket 7, the coffee beans in the basket 7 are ground into coffee powder having an appropriate coarseness. When the coffee beans are ground to a suitable coarseness, when the switch 45 opens contacts T ₁ - T ₂ and closes contacts T ₁ - T ₃ , the power to the motor 3 is cut off. The rotation of the grinding body 20 is stopped and the coffee powder is piled up on the filter 24. Then, when the contact pieces T ₁ -T ₃ of the changeover switch 45 are closed, the sheath heater 34 in the heating body 33 is energized and generates heat, so that the water in the heating pipe 35 is heated. This allows water from the water storage tank 36 to flow into the heating pipe 3.
The hot water is boiled and expanded in the hot water supply pipe 5, moves to the hot water supply pipe 39 side by the action of the check valve 37, rises, and flows from the opening 38 of the hot water supply pipe into the hot water tray 2 of the basket lid 25.
6 and also drips into the coffee powder in the basket through the small hole 27. The dropped hot water passes through the coffee powder, and the coffee liquid from which the coffee components are extracted is filtered by the filter 24, and the coffee liquid is retained in the glass container 28 through the spout 13. When the water in the water storage tank 36 runs out, the thermostat TH operates and the glass container 28
The lower surface of the holder is heated to an appropriate temperature by a sheathed heater 34 via a heat insulating plate 32.

The milling function of conventional coffee boilers is such that coffee beans are ground to a certain particle size due to slippage of the coffee beans during the rotation of the grinder, differences in hardness depending on the type of coffee beans, or differences in the degree of grinding force. It is very difficult to grind coffee powder with a uniform particle size during a short grinding time of about 20 seconds, as small particles are ground into smaller particles and large particles remain large. It was impossible to obtain. Furthermore, since the filter is clogged by small-sized coffee powder, hot water overflows from the basket, stains the container, or enters the container, causing malfunctions.

Furthermore, the method of extracting coffee during dripping is
Hot water was dripped onto the coffee powder, and the coffee extract was allowed to fall naturally from the filter, so even though the hot water supply had finished discharging from the water heater, the hot water in the coffee powder in the basket continued to flow. The residence time of the coffee liquid is long, and the point at which the extraction of the coffee liquid is completed is not certain, so even after the glass cup serving as the coffee liquid receptacle is removed, the coffee liquid drips and stains the container.

An object of the present invention is to solve this problem by providing a rotary blade on the bottom surface of the filter in a basket having a filter, and by making it possible to change the direction of rotation of the rotary blade, the filter can be rotated while grinding coffee beans. The particle size of the coffee powder is made uniform by creating an upward flow from the bottom of the coffee cup, and at the same time, during dripping, by rotating the rotary blade in the opposite direction, the extraction completion time is shortened and the coffee powder is prevented from falling. Furthermore, it is an object of the present invention to provide a coffee boiler in which the temperature of the coffee can be adjusted by the fan effect of the rotating blades.

Next, the coffee brewer of the present invention will be explained based on examples. FIG. 4 is a sectional view showing one embodiment of the coffee brewer according to the present invention, and FIG. 5 is an enlarged sectional view of the basket portion shown in FIG. 4. In FIGS. 4 and 5, parts having the same functions as those of the coffee brewer shown in FIGS. 1 and 2 are given the same reference numerals, and detailed explanation thereof will be omitted. In FIGS. 4 and 5, reference numeral 47 denotes a rotating blade, which is attached to the rotating shaft 48 of the pulverizer 20 and located on the lower surface of the filter 24. This rotating blade 4
7 extends outward from the rotating shaft 48 and is formed integrally with the rotating shaft 48 .

FIG. 6 is a diagram showing an embodiment of a drive circuit for a sheathed heater and a motor in a coffee boiler according to the present invention. In the figure, 42 and 43 are power terminals, 45 is a changeover switch that also serves as a power switch, and has a movable contact piece _T1 and a fixed contact piece.
It has T ₂ and T ₃ . 49 is a mill switch for turning the rotation of the drive motor 3 on and off. 50 is a variable resistor,
This is for controlling the preheating power of the sheathed heater and the rotation speed of the motor 3. Reference numeral 51 denotes a field winding of the motor 3, the excitation direction of which is switched by a rotation direction changeover switch 52.
This rotational direction switching switch 52 operates a cam mechanism (not shown) using an external shaft to switch the movable contact pieces _T4 and _T5 from the fixed contact piece T6 or the fixed contact piece T6 or _T5 , respectively.
It is connected to either T ₇ and fixed contact piece T ₈ or T ₉ to arbitrarily switch the direction of rotation of the motor 3. That is, movable contact piece T ₄
and T ₅ are connected to the fixed contacts T ₆ and T ₈ , respectively, the power terminal 42 - the movable contact T ₁ - the fixed contact T ₂ - the armature of the motor 3 - the movable contact T ₄ -
A circuit consisting of fixed contact piece T ₆ - field winding 51 - fixed contact piece T ₈ - movable contact piece T ₅ - mill switch 49 - power supply terminal 43 is formed, and the motor 3 is rotated in the direction of arrow A. Furthermore, when the movable contact pieces T ₄ and T ₅ are connected to the fixed contact pieces T ₇ and T ₉ respectively, the power terminal 42 - movable contact piece T ₁ - fixed contact piece T ₂ - motor 3
Armature - Movable contact T ₄ - Fixed contact T ₇ - Fixed contact
T ₈ - Field winding 51 - Fixed contact piece T ₆ - Fixed contact piece T ₉ -
Movable contact piece T ₅ - Mil switch 49 - Power terminal 43
A circuit is formed, and the motor 3 is rotated in the opposite direction in the direction of arrow B.

Next, the operation of the coffee brewer configured as described above will be explained. A predetermined amount of water is put into the water storage tank 36, and a predetermined amount of coffee beans is put into the basket 7. Then, the changeover switch 45 is operated to close the movable contact piece _T1 and the fixed contact piece _T2 , and the rotation direction changeover switch 52 is set to the forward rotation side, that is, the movable contact pieces _T4 and _T5 are closed to the fixed contact piece T2. ₆ and _T8 side and then operate the mill switch 49 to energize the motor 3.
8 is rotated in the forward direction. This rotation of the rotating shaft 48 causes the rotating blades 47 and the crushing body 20 to rotate in the forward direction. The rotation of the rotary blade 47 generates wind from below to above the filter 24 , so that among the coffee beans ground by the grinding body 20 , those with a small particle size are blown upward and into the upper part of the basket 7 . Soar. On the other hand, large coffee grains remain below the grinding body 2.
The powder is pulverized to a desired particle size under the action of the rotating blade 47, and when the particle size reaches a predetermined size, it is blown upward by the wind generated by the rotating blades 47. Through this process, the entire coffee bean is ground to a predetermined particle size. Therefore, powder with uniform particle size can be obtained, and there is no possibility that fine coffee powder and coarse coffee grains are mixed together as in the conventional method.

Further, since the coffee powder that is about to clog the filter 24 is blown upward by the wind pressure from the rotary blade 47, the filter 24 will not be clogged.

Then, when the coffee beans are ground to a desired particle size, the changeover switch 45 is operated to close the movable contact piece _T1 and the fixed contact piece _T3 , and the sheathed heater 34
is energized and dripping begins. As mentioned above, coffee powder with a constant particle size is passed through the filter 2.
4, and particularly fine coffee treads are present on the upper layer side, so the filtration ability is constant, a coffee liquid with a stable concentration is extracted, and the filter 24 does not become clogged. This prevents boiling water from overflowing from the basket. At this time, the motor 3 is equipped with a selector switch 45.
The movable contact T ₁ - fixed contact T ₃ - variable resistor 50 - motor 3 - rotation direction changeover switch 52 - energization is possible through the mill switch 49, so operate the mill switch 49 to close the contacts of the mill switch 49. By closing, the motor 3 is energized via the variable resistor 50 and rotated at a low speed. Therefore, the coffee extract is cooled by the fan effect of the rotary blade 47, and the temperature at which the coffee is prepared can be arbitrarily controlled. That is,
The fan effect can be adjusted by adjusting the resistance value of the variable resistor 50.

Then, when the hot water has been completely discharged from the water heater, the rotation direction changeover switch 52 is operated to switch the movable contact pieces T ₄ and T ₅ from the fixed contact pieces T ₇ and
When switching to the _T9 side and reversing the direction of the excitation current to the field winding 51, operate the mill switch 49 to close the contact, power is supplied to the motor 3 through the variable resistor 50, and the motor 3 is powered at low speed. rotated in the opposite direction. For this reason, wind from above to below is generated by the rotary blade 47, a negative pressure is created in the lower part of the filter 24, and the hot water contained in the coffee powder is forcibly filtered through the filter 24 and falls. Therefore, the completion point of coffee extraction can be accelerated, and by adjusting the value of the variable resistor 50, it is also possible to adjust the extraction time. Therefore, even if the glass container 28 serving as a coffee receiver is removed from the heat insulating plate 32, drops of coffee liquid will still remain on the heat insulating plate 32.
To provide a coffee boiler which is very easy to use and does not stain the container body by dripping onto the water, etc., reduces the user's restraint time, and is very easy to use.

Furthermore, even when grinding coffee beans, by adjusting the resistance value of the variable resistor 50 to a low value, heating power can be supplied to the sheathed heater 34 to preheat the heating element. It is also possible to shorten the time it takes for hot water to start discharging when switching to the drip side.

Furthermore, since the rotation direction of the motor 3 can be reversed even during grinding, by configuring the grinding capacity of the grinding body 20 to differ depending on the rotation direction, variations in the particle size of coffee powder can be reduced not only by the grinding time but also by changing the grinding capacity of the grinder 20 depending on the rotation direction. , can also be selected depending on the direction of rotation.

Furthermore, by configuring the joint 6 and the joint 21 as one-way conduction joints, only the rotary blades are rotated without rotating the pulverizer when the motor 3 is reversed, so that the pulverizer is immersed in the coffee powder during dripping. It is also possible to obtain coffee liquid with less turbidity by not rotating it.

As described above, in the coffee boiler of the present invention, rotating blades are provided on the rotating shaft of the grinding body on the lower surface of the filter, and the rotating direction and rotation speed of the rotating blade can be controlled arbitrarily. Therefore, the particle size of the coffee powder can be made uniform, the filter will not be clogged, the temperature at which the coffee is made can be adjusted, and the time required to complete extraction of the coffee liquid can be shortened. It becomes possible to provide a coffee boiler that is extremely easy to use.

[Brief explanation of the drawing]

1 is a sectional view showing an example of a conventional coffee boiler, FIG. 2 is an enlarged sectional view of the basket portion in FIG. 1, and FIG. 3 is a sectional view of the coffee boiler shown in FIG. 1. FIG. 4 is a sectional view showing an embodiment of the coffee boiler according to the present invention, and FIG. The enlarged sectional view, FIG. 6, is a diagram showing a drive circuit for a sheathed heater and a drive motor in the coffee brewer according to the present invention. DESCRIPTION OF SYMBOLS 1... Base, 2... Base container, 3... Drive motor, 4... Elastic member, 5... Rotating shaft, 6... Joint, 7... Basket, 8... Upper basket,
9...Lower basket, 10...Basket inner lid, 11...Step, 12...Protrusion, 13...Spout, 14...Bottom surface, 15...Through hole, 16...Protrusion, 17...Step Part, 18... Outer peripheral part, 19...
Cylindrical part, 20... Crushed body, 21... Joint, 22...
... Central cylinder, 23 ... Outer cylinder, 24 ... Filter, 25 ... Basket lid, 26 ... Boiling water tray, 27 ... Small hole, 28 ... Glass container, 29 ...
... Glass lid, 30 ... Peripheral socket, 31 ... Handle, 32 ... Heat insulation plate, 33 ... Heating body, 34 ...
Sheathed heater, 35... Heating pipe, 36...
Water storage tank, 37... Check valve, 38... Opening,
39...Hot water pipe, 40, 41...Top lid, 42,
43...Power terminal, 44...Power switch, 45
...changeover switch, 46...safety switch,
TH...Thermostat, 47...Rotating vane, 4
8...Rotating shaft, 49...Mil switch, 50...
Variable resistor, 51... Field winding, 52... Rotation direction switching switch.

Claims (1)

[Scope of Claims] 1. In a basket having a filter, a drive motor rotates a grinding body on the filter to grind coffee beans into coffee powder, and hot water is supplied to the coffee powder to pass through the filter. In a coffee boiler that has a milling function for filtration and a dripping function, a rotary blade that is rotated in conjunction with the rotation of the grinding body is arranged below the filter, and the rotary blade is rotated during milling and dripping. 1. A coffee boiler characterized by being configured such that the direction of rotation thereof can be reversed. 2. The coffee brewer according to claim 1, wherein the rotational speed of the rotary blade can be adjusted during dripping.