JPS6284710A - Electric coffee extractor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] The present invention relates to an electric coffee extractor, and its object is to provide an electric coffee extractor that can extract coffee hot water under optimal conditions. It is about providing.

A conventional electric coffee extractor will be explained with reference to the schematic diagram of FIG. 1 is a water tank that stores water 2; 5 is a main heater that heats the water tank 1; 4 is a vapor pressure detector that detects the vapor pressure in the water tank 1; 5 is a hot water supply valve; 6 is a power switch;
6' is a heater switch, 7 is a filter equipped with a filter 8, and 9 is an auxiliary heater for keeping the coffee cup 10 warm.

In the above structure, when water 2 is injected into the water tank 1, powdered powder is put into the filter 8, and the power switch 6 is turned on, the water 2 in the water tank 1 is heated by the heater 5 and boils. .

When the steam pressure detector 4 detects this, the hot water supply valve 5 is opened to supply hot water to the filter 7, and coffee hot water is extracted.

The extracted coffee hot water is stored in a coffee cup 10 which is kept warm by an auxiliary heater 9. When the steam pressure detector 4 detects the steam pressure, it opens the hot water supply valve 5, turns off the heater switch 61, and stops energizing the main heater 3.

However, the above-mentioned conventional electric coffee extractor has the following problems. In order to obtain flavorful coffee water, it is necessary to pass boiling hot water through it in a short period of time, but in conventional electric coffee extractors, when the hot water supply valve 5 opens and the supply of hot water is started, When the heater switch 61 is turned off, the power supply to the main heater 3 is stopped.

Therefore, at the beginning of hot water supply, high-temperature hot water is supplied, but as time passes, the temperature of the hot water decreases and the flavor of the extracted coffee water deteriorates.

If the heater switch 61 continues to be turned on in order to maintain the temperature of hot water at a high temperature until the end of hot water supply, there is a risk that the water tank 1 will become empty at the end of hot water supply. An object of the present invention is to provide an electric coffee extractor that can solve this problem and extract coffee hot water under optimal conditions.

[Structure of the Invention] The electric coffee extractor of the present invention includes a water tank having a main heater and a hot water supply valve connected in series with a heater switch, and detects steam generated in the water tank to operate an operating lever. Same as vapor pressure detector,
The heater switch has a timer mechanism that shuts off the power supply circuit of the main heater after a certain period of time,
The operating lever is configured to open the hot water supply valve to supply hot water in the water tank to the filter, and close a timer switch that operates a timer mechanism of the heater switch.

An embodiment of the invention will be described with reference to FIG.

Reference numeral 11 denotes the main body of this electric coffee brewer, which supports a stainless steel water tank 12 and has a main heater 13 for heating it, and a steam detector 14 and other attached mechanisms are attached thereto.

15 is a base on which the main body 11 is placed, and an auxiliary heater 16 for keeping warm and a power supply connection part 17 are attached thereto.

A U-shaped space 18 is formed between the main body 11 and the base 15, and accommodates a coffee cup 21 on which a funnel-shaped filter 20 having a filter 19 is mounted. 22 is a cover of the filter 20. Reference numeral 23 denotes a heat insulating plate attached to the base 15, and the auxiliary heater 16 is pressed against it by a spring 24, and the coffee cup 21 is placed on this heat insulating plate 23. A thermostat 25 controls the temperature of the auxiliary heater 16, and a thermostat 26 detects the temperature of the water tank 12 and controls the main heater 16.

The water tank 12 has a water inlet 28 with a lid plate 27 on the top and a steam pipe 29, and a hot water supply valve 60 is attached on the bottom. The hot water supply valve 30 has a valve body 60 that closes the passage to the hot water supply port 31.
α, the valve shaft 30b to which it is attached, a spring 30C that biases the valve body 30α to close the hot water supply port 31,
When the valve stem 30h is pushed up against the spring 30C, the hot water supply port 31
will be held.

The steam pressure detector 14 connected to the steam pipe 29 is equipped with a Ti
, a coil-shaped vapor pressure sensing element 14α made of -Hi-based shape memory alloy υ, bias springs 1 and 4b, and an operating shaft 14.
C, the cylindrical body 141 that accommodates these, the cylindrical body 1
4d is provided with a steam exhaust hole 14g. The vapor pressure sensing element 14α is pushed up by the elastic force of a bias spring 14b disposed below it, and is subjected to memory processing so that it expands from its compressed state and returns to its original state when a predetermined temperature is reached due to the vapor pressure. has been done. 32 is a vapor pressure detector 14
An operating lever provided below the operating shaft 14C of the operating shaft 1.
When 4C falls, a heat retention switch 33 connected in series with the auxiliary heater 16 and a timer switch 34 connected in series with a thermo-heater 35α that heats the thermostat 35
is closed, and the other end pushes up the valve shaft 30h of the hot water supply valve 30 to open the hot water supply port 31. 36, the operating lever 32 is a switch 63.
34 is a locking lever that locks into this and maintains that state when it is closed.

37 is a power button; when pressed, the power switch 38 is activated.
Close. Reference numeral 59 denotes a locking lever that holds the power switch 38 in the closed state of the power push button 37. Reference numeral 40 denotes a reset push button, and when pressed, the locking lever 36 turns on the switches 33 and 54 and the locking lever 39 turns off the switch 38, turning them off and resetting the thermostat 65. The thermostat 35 has its heat-sensitive surface heated by a thermoheater 35LL,
It has the function of turning off the circuit of the main heater 15 when a predetermined temperature is reached. In this example thermostat 3
5 and the thermo-heater 35α correspond to a heater switch having a timer mechanism according to the present invention. In addition to a thermostat, an OR timer or the like may be used as the heater switch having this timer mechanism. FIG. 2 is a circuit diagram showing these electrical connections, 41 and 42 are power supply terminals, and 43 is a temperature fuse.

Next, its effect will be explained. Filter coffee powder19
The filter 20 placed inside is placed on the coffee cup 21, the coffee cup 21 is placed on the heat insulating plate 23, water is poured into the water tank 12, and the power switch 38 is turned on by the power push button 37. When the power switch is turned on on the 5th day, the main heater 13 starts to be energized, and the water tank 12 reaches a predetermined temperature adjusted by the thermostat 26. When the water in the water tank 12 boils and steam is generated, the generated steam passes through the steam pipe 29 and enters the steam pressure detector 14.

The vapor pressure sensing element 14α is heated by this vapor, and 1
When the temperature reaches 00° C. or higher, a restoring force is applied to return the compressed state to the memorized original state, causing it to expand against the bias spring 14A. Due to the expansion of the vapor pressure sensing element 14α, the operating shaft 14c is pushed down and acts on the operating lever 32, which closes the heat retention switch 35 and the time limit switch 34, and closes the auxiliary heater 16 and thermo-heater 35α.
At the same time, the hot water supply valve 30 is opened to supply hot water in the water tank 12 to the filter 20. Actuation axis 1
The operating lever 32 pushed down by the lever 4c is locked to the locking lever 36, closing the switches 33 and 34 and closing the hot water valve 6.
Hold the opening of °. In this way, extraction of coffee hot water begins.

When the timer switch 34 is turned on, energization of the thermoheater 35α is started, and the thermoheater 35α is connected to the thermostat 5.
Heat 5. And when the set time has passed,
The thermostat 35 reaches the operating temperature and the main heater 1
Cut off circuit 3. The hot water supply valve 60 is set so that the supply of hot water in the water tank 12 matches the optimum extraction time of 3 to 4 minutes for brewing coffee hot water.
α is the time required for the thermostat 35 to reach its operating temperature, which is set at around 5 minutes, which is slightly shorter than the 3 to 4 minutes mentioned above, so that the time required for the thermostat 35 to reach the operating temperature is set to around 5 minutes, so that the time required for the thermostat 35 to reach the operating temperature is set at around 5 minutes, so that the time required for the thermostat 35 to reach the operating temperature is set at around 5 minutes, which is slightly shorter than the 3 to 4 minutes described above. The power supply to the main heater 13 is stopped (before the water tank is empty).

At the same time as the time limit switch 34, the heat retention switch 33 is turned on, and energization of the auxiliary heater 16 is started. Auxiliary heater 1
The temperature of the coffee cup 6 is adjusted by the thermostat 25 to reach the keeping temperature, thereby keeping the coffee cup 21 warm. The coffee hot water extracted by passing through the filter 20 is stored in the heated coffee cup 21, and the extraction of the coffee hot water is completed. When the coffee hot water has been extracted, the reset button 40 is pressed to open the power switch 38, and the operating lever 32 is released from the locking lever 36, and the heat retention switch 36 is opened.
and turns off the timer switch 34. The reset push button 4o simultaneously resets the thermostat 35.

Although the embodiment of the present invention has been described above with respect to the case where the auxiliary heater 16 for keeping warm is provided, it is not a requirement for the present invention to provide the auxiliary heater 16 for keeping warm. Although a warming heater is necessary for a large-sized coffee brewer, a small personal coffee brewer does not require a warming heater in the present invention for reasons described below. Although illustration of an embodiment of the present invention that does not include this heat-retaining heater is omitted,
In Fig. 1, the auxiliary heater 16, spring 24, thermostat 25, and heat retention switch 33 are excluded, and in Fig. 2, the series circuit of the auxiliary heater 16, thermostat 25, and heat retention switch 3B is removed. good.

[Effects of the Invention] Since the present invention has the above configuration, it has the following effects. (1) Since the main heater 13 is heated from the time when the hot water supply valve 30 is opened to start supplying hot water until the supply of hot water is finished, coffee hot water can be extracted with high temperature hot water from beginning to end. Then, the time required for the amount of hot water required for one extraction to pass through the hot water supply valve 30 is set so that the optimum extraction time for coffee hot water is 3 to 4 minutes, and after the hot water supply has started. By setting the thermostat 35 to keep the main heater 13 on for 2 to 3 minutes, which is slightly shorter than the extraction time of 3 to 4 minutes, coffee hot water can be extracted at the optimum temperature and for the optimum time. You can drink high-quality coffee hot water with good flavor. (2) Since the main heater 13 is turned off before the supply of hot water ends and before the water tank is empty, there is no risk of burning water. (3) Conventional coffee extractors stop heating the main heater when the water boils, but in the present invention, the boiling water is further heated until just before supply, so the boiling time is longer and the flavor of the coffee water is enhanced during this time. Harmful components such as chloride, trihalomethane, and carbon dioxide are removed. (4) Conventional coffee extractors required a coffee cup heater because the extraction time was long, but in the present invention, the extraction of coffee hot water is completed in a short time of 3 to 4 minutes, so it is easy to use for personal use. A small coffee brewer does not require this, and the structure can be made smaller and simpler.

[Brief explanation of drawings]

1N: Cross-sectional view of an embodiment of the electric coffee extractor of the present invention. Figure 2: Electric circuit diagram of the electric coffee extractor shown in Figure 1. Figure 3: Schematic diagram of a conventional electric coffee extractor. [Symbol] 11
...Body, 12...Water tank, 13...Main heater, 14...Steam pressure detector, 15...Base, 16
...Auxiliary heater, 17...Power connection part, 18...
Fully open, 19...filter, 20...filter, 21.
...Coffee cup, 22...Cover, 23...Heating board, 24...Spring, 25.26...Thermostat, 27...Lid plate, 28...Water inlet, 29... Steam pipe, 30... Hot water supply valve, 51... Hot water supply port, 32.
・・Activated/<-133 ・・Heat insulation switch, 54・・
・Timed switch, 35... Thermostat, 36...
・Latching lever, 37...Power push button, 39...Latching lever, 40...Reset push button, 41.42...Power terminal, 45...Phase diagram 1

Claims (1)

[Claims] It consists of a water tank that has a main heater and a hot water supply valve connected in series with a heater switch, and a steam pressure detector that detects the steam generated in the water tank and operates an actuation lever. In a configuration including a timer mechanism that later interrupts the power supply circuit of the main heater, the operating lever opens the hot water supply valve to supply hot water in the water tank to the filter, and operates the timer mechanism of the heater switch. Electric coffee brewer configured to close a timed switch