JPS6284709A - electric coffee brewer - 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 purpose is to extract coffee hot water in an optimal manner without wasting electricity and in a safe manner. The purpose of the present invention is to provide an electric coffee brewer that can perform under certain conditions.

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; 3 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;
61 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 poured into the water tank 1, coffee 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 3 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. Since the auxiliary heater 9 is turned on at the same time as the main heater 3, until the water 2 in the water tank 1 boils and hot water supply starts, the auxiliary heater 9 is not used to heat the empty coffee cup, and power is wasted. Furthermore, since the auxiliary heater 9 for keeping warm is exposed before the coffee cup 10 is attached, there is a risk of burns if it is touched. SUMMARY OF THE INVENTION An object of the present invention is to solve these problems and provide an electric coffee extractor having a structure that is safe and does not consume unnecessary power.

[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 a steam generator that detects steam generated in the water tank and operates an operating lever. It has a pressure detector and an auxiliary heater for keeping the coffee cup warm, and the operating lever opens the hot water supply valve to supply hot water in the water tank to the filter, and is simultaneously connected to the circuit of the auxiliary heater. It is characterized in that it is configured to close the heat retention switch.

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

Reference numeral 11 is the main body of this electric coffee extractor, which supports a stainless steel water tank 12 and has a main heater 13 for heating it, and a vapor pressure 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 in which a funnel-shaped filter 20 having a filter 19 is mounted. 22 is a cover of the filter 20. 23 is a heat insulating plate attached to the base 15, 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.

25 is a thermostat that controls the temperature of the auxiliary heater 16; 26 is a thermostat that detects the temperature of the water tank 12 and controls the main heater 1;
This is a thermostat that controls 3.

The water tank 12 has a water inlet 28 with a lid plate 27 at the top and a steam pipe 29, and a hot water supply valve 30 is attached to the bottom. The hot water supply valve 50 has a valve body 30 that closes a passage to the hot water supply port 51.
α, the valve shaft 3ob to which it is attached, and the spring 3oc that urges the valve body 50α to close the hot water supply port 31.
When the valve shaft sob is pushed up against the spring 30C, the hot water supply port 61
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 a Ni-based shape memory alloy, a bias spring 14b, and an operating shaft 14c;
The cylinder body 14d that accommodates these is similar to the cylinder body 14d, and the cylinder body 14d is provided with a steam exhaust hole 14g. Vapor pressure sensing element 14
A is pushed up by the elastic force of a bias spring 14b placed below it, and is subjected to memory processing so that it will expand from its compressed state and return to its original state when it reaches a predetermined temperature due to vapor pressure. . Reference numeral 52 denotes an operating lever provided below the operating 1M14c of the steam pressure detector 14, and the operating lever 14c.
When the temperature drops, the heat retention switch 63 connected in series with the auxiliary heater 16 and the time limit switch 34 connected in series with the thermo-heater S5α that heats the thermostat 35 are closed, and the other end pushes up the valve shaft sob of the hot water supply valve 30 to start hot water supply. Mouth 3
Open 1. 36, the operating lever 52 is the switch 33.54
This is a locking lever that locks the door when it is closed and holds it in that state.

57 is a power button; when pushed up, the power switch 38 is activated.
Close. Reference numeral 39 denotes a locking lever for holding the power switch 38 in the closed state of the power push button 67. Reference numeral 40 designates a reset push button, which, when pressed, turns on the switches 33 and 34 by the locking lever 36 and turns off the switch 38 by the locking lever 39, turning them off and resetting the thermostat 35. The thermostat 35 has its heat-sensitive surface heated by the thermo-heater 354, and has the function of turning off the circuit of the main heater 13 when a predetermined temperature is reached. In this embodiment the thermostat 35
The thermo-heater 35α corresponds 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 the time limit mmt. 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 cutlet 21 is placed on the heat insulating plate 23, water is poured into the water tank 12, and the power switch 68 is turned on by the power push button 37. When the power switch 38 is turned on, energization of the main heater 13 is started, 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 vibrator 29 and enters the steam detector 14. The vapor pressure sensing element 14α is heated by this vapor, and 10
When the temperature reaches 0° 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 14.6. This expansion of the vapor pressure sensing element 14α pushes down the operating shaft 14c and acts on the operating lever 52, which closes the heat retention switch 66 and the time limit switch 34, and closes the auxiliary heater 16 and thermo-heater 35α.
At the same time, the 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 4C is locked to the locking lever 36, closing the switches 33 and 34 and closing the hot water supply valve 3.
Hold the opening at 0. In this way, extraction of coffee hot water begins.

When the timer switch 34 is turned on, the thermoheater 35α starts to be energized, and the thermostat 3
Heat 5. Then, after the set time has elapsed, the thermostat 35 reaches the operating temperature and the circuit of the main heater 13 is completely cut off. The hot water supply valve 30 is set so that the supply of hot water in the water tank 12 matches the optimum extraction time of 6 to 4 minutes for brewing coffee hot water, while the thermo-heater 35α is set to match the time required for the thermostat 35 to reach the operating temperature. Since the above-mentioned 3 to 4 minutes is set to around 6 minutes, which is slightly shorter, the main heater is turned off before the supply of hot water from the water tank 12 to the filter 20 is finished (before the water tank 12 is empty). 13 is stopped.

At the same time as the time limit switch 34, the heat retention switch 3 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 through the filter 20 is stored in the coffee cup 21 kept warm, 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 52 is released from the locking lever 36 to release the heat retention switch 3.
and turns off the timer switch 34. Reset push button 40 simultaneously resets thermostat 35.

[Effects of the Invention] Since the present invention has the above configuration, it has the following effects. (1) The auxiliary heater of a conventional electric coffee brewer turns on at the same time as the main heater is energized, so it heats the empty coffee cup until the water tank reaches a hydraulic boil and hot water starts being supplied. Power is wasted. However, in the present invention, immediately before hot water supply starts, the heat retention switch 36 is turned on) and energization to the auxiliary heater 16 is started, so there is no wasteful consumption of power. (2) The auxiliary heater for keeping warm is exposed before the coffee cup is attached, and in conventional electric coffee brewers, the power is turned on early, so there was a risk of burns if you touched it, but with this invention The auxiliary heater is energized just before the coffee cup is attached and brewing begins, so there is no risk of touching it or getting burned.

(5) Since the make heater 13 is turned off before the supply of hot water ends and before the water tank is empty, there is no risk of it being emptied. (4) Conventional coffee extractors stop heating the make 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 long, and during this time the coffee water is heated. Harmful components such as "ruki", trihalomethane, and carbon dioxide that harm the flavor of coffee are removed. (5) In order to obtain coffee hot water with good flavor, it is necessary to pass boiling hot water through it in a short period of time. However, with conventional electric coffee brewers, the heater switch is turned off when the hot water supply valve is opened to start supplying hot water. The temperature gradually decreases. However, in the present invention, the make heater 1 is operated 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.
3 is heated, so that coffee can be extracted with hot water from beginning to end. Then, the time required for the amount of hot water required for one brewing to pass through the hot water supply valve 50 is set to be the optimum coffee hot water extraction time of 3 to 4 minutes, and after the hot water supply has started. By setting the thermostat 55 to keep the make heater 13 on for 2 to 3 minutes, which is slightly shorter than the 3 to 4 minutes mentioned above, coffee hot water can be extracted at the optimum temperature and for the optimum time. You can drink high-quality coffee with good flavor.

[Brief explanation of drawings]

Fig. 1 2 A sectional view of an embodiment of the electric coffee extractor of the present invention Fig. 2: Electrical (b) schematic diagram of the electric coffee extractor of Fig. 1 Fig. 3: Schematic diagram of a conventional electric coffee extractor and extractor Symbol] 11
... Main body, 12 ... Water tank, 15 ... Make heater, 14 ... Vapor pressure detector, 15 ... Base, 16
...Auxiliary heater, 17...Power connection part, 18...
space, 19...filter, 20...filter, 21.
...Coffee cup, 22...Cover, 25...Heat insulation board, 24...Spring, 25.2616. Thermostat, 27... Lid plate, 28... Inlet, 29... Steam vibe, 30... Hot water supply valve, 51... Hot water supply port, 32.
...Operating lever, 33...Heat insulation switch, Ro4...
Time switch, 65... Thermostat, 66...
Locking lever, 37... Power push button, 59... Locking lever, 40... Resent push button, 41.42... Power terminal, 43... Fuse Figure 1

Claims (2)

[Claims] (1) A water tank that has a main heater and a hot water supply valve with a heater switch connected in series, a steam pressure detector that detects the steam generated in the water tank and operates the operating lever, and an auxiliary that keeps the coffee cup warm. a heater, and the operating lever is configured to open the hot water supply valve to supply hot water in the water tank to the filter, and at the same time close a heat retention switch connected to the circuit of the auxiliary heater. Electric coffee brewer featuring (2) A patent characterized in that the heater switch is equipped with a timer mechanism that shuts off the power circuit of the main heater after a certain period of time after the operating lever opens the hot water supply valve and starts supplying hot water. Electric coffee brewer according to claim (1)