JPH04210009A - Electric coffee boiler - Google Patents

Abstract

PURPOSE:To protect switch contacts of an electric coffee boiler extracting high temperature coffee by designing switches so that the contacts of the higher input voltage circuit are closed with priority in switching contacts of a heater circuit and switching contacts of a motor circuit. CONSTITUTION:A switch 8 is composed of an operating rod 16 closing or opening the circuit by the simultaneous action of both contacts 18 of a motor circuit and contact 19 of a heater circuit and an operating rod 17 closing or opening only the contact 19 of the heater circuit. The distance (x) between contacts on opening of the contacts 15 is designed to make shorter thus the distance (y) between contacts on opening of the contacts 14. When the operating rod 16 is transferred by the distance A, the currents 0.5A, 0.8A are conducted respectively in both motor circuit and heater circuit. Since the distance (x) on opening of the contacts 15 is set shorter than the distance (y) on opening of the contacts 14, the contact 19 is deformed and a larger contacting force than the contact 14 is added in the contact 15 conducting a large current. In this way, it can prevent arc from generating between contacts and prevent the easily heated contact 15 from increase of temperature.

Description

[Detailed description of the invention]

[00011

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric coffee brewer capable of producing high-temperature coffee liquor. [0002] [0002] In recent years, electric coffee brewers have become widespread, and there is a demand for products that can produce delicious coffee. [0003] A conventional electric coffee brewer will be described below. FIG. 4 shows the configuration of a conventional electric coffee maker. When water is introduced into the water supply tank 1, the other end of the water supply pipe 4 is led to the coffee brewing chamber 6 via the water supply tank 1 and the check valve 2. [0004] Then, water is heated by the heating unit 5 connected to the water supply pipe 4 to boil water, and is supplied to the coffee brewing chamber 6 via the water raising unit 7. The coffee liquid extracted by this method is stored in a container 3 disposed at the lower part of the coffee extraction chamber 6. [0005] By placing the container 3 on the heating unit 5, the coffee liquid is heated during and after extraction of the coffee liquid to obtain a high-temperature coffee liquid. [0006]

[Problems to be Solved by the Invention] In such a conventional electric coffee boiler, the water injected into the water supply tank 1 passes directly through the portion of the water supply pipe 4 that is connected to the heating section 5, and then passes through the hatching shown in the figure. As shown, the water rising part 7 is filled with water, and when the heating part 5 is activated to start dripping, the water in that part is supplied to the coffee extraction chamber 6 without being heated. [0007] This causes a decrease in the temperature of the extracted coffee liquid. Furthermore, if the amount of coffee extracted is small, the extraction time is also shortened, and the coffee accumulated in the container 3 may not be heated sufficiently. [00081] The present invention solves these problems, and its first object is to provide an electric coffee boiler that extracts coffee at high temperature. The second purpose is to protect the contacts of the switch. The third purpose is to make the user easily aware that the heating section is energized, and to prevent injuries such as burns. [0009]

[Means for Solving the Problems] In order to achieve the above object, the present invention has a first means that operates after energizing the heating section in the middle of the water supply channel from the tank to the coffee brewing chamber passing through the heating section. The system is equipped with a channel opening/closing device. [0010] The second means connects the contact of the switch of the heating section circuit and the switch of the motor circuit so that the contact of the circuit with higher input power is closed preferentially. [0011] The third means includes an operating body having a biasing member that can simultaneously close a contact point of a switch of a circuit of the heating section and a contact point of a switch of a circuit of a motor, and a contact point of a switch of a circuit of a heating section. The operating body is equipped with an urging member that can close the contacts of the switch of the two circuits and has a force larger than the urging force that closes the contacts of the two circuits. [0012]

[Function] The present invention has the above-mentioned configuration, and the first problem-solving function is that the water passes through the water pipe after the heating section is energized and generates heat, so that hot water at a higher temperature than the initial stage of discharge is transferred to the coffee brewing chamber. can be supplied to [0013] The second problem-solving action is such that the contact of the circuit with higher input power is preferentially closed between the contact of the switch of the heating section circuit and the contact of the switch of the motor circuit. Therefore, when the two contacts are closed at the same time, it is possible to prevent an abnormal temperature rise in the contact of the circuit with higher input power. [0014]Furthermore, the third problem-solving function includes an operation body having an urging member that can simultaneously close the contact of the switch of the circuit of the heating section and the contact of the switch of the circuit of the motor; By providing an operating body having a biasing member capable of closing only the circuit switch contacts and having a biasing force larger than the biasing force capable of closing the contacts of the two circuits, the heating section can be heated. This allows the user to easily recognize the energization of the device and prevent burns and other injuries. [0015]

[Example] (Example 1) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings. Note that parts that are the same as those of the conventional product will be described with the same reference numerals. [0016] FIG. 1 shows an embodiment related to the first problem of the present invention. Water tank 1 is switch 8
It is connected to a water supply channel 4 equipped with a channel opening/closing device 9 and a check valve 2 that operate in conjunction with the flow channel opening/closing device 9 and the check valve 2. The water supply channel 4 is connected to a heating unit 5 such as an electric heater. [0017] 6 is set below the coffee grinding chamber 10 together with the container 3 in the coffee brewing chamber. Inside the coffee bean grinding chamber 10 is a cutter 12 that is linked to a motor 11.
It is equipped with Reference numeral 13 denotes a water rising part that guides the hot water heated by the heating source 5 to the coffee brewing chamber. [00181 FIG. 2 is a detailed diagram of the switch 8. The switch 8 includes an operating rod 16 that opens and closes the contacts 14 of the motor circuit and the contacts 15 of the heating circuit at the same time, and an operating rod 17 that operates in conjunction with the channel opening/closing device 9 and opens and closes the contacts 15 of the heating circuit at the same time. ing. [0019] In the above configuration, coffee beans are put into the coffee bean grinding chamber 10 and set below the coffee bean grinding chamber 10 together with the container 3 and the coffee extraction chamber 6. When water is poured into the water supply tank 1, the water is stored in the water supply tank 1 because the channel opening/closing device 9 is closed. [00201 After that, actuate the operating rod 16 of the switch 8 to close the contact 14. When the contact 15 is closed, the cutter 12 that is linked to the motor 11 is rotated, and the coffee beans are delivered to the coffee extraction chamber 6 set below the grinding chamber 10 and stored therein. [0021] At this time, the heating section 5 generates heat and has a high temperature. When the coffee beans have been ground, the operating rod 16 of the switch 8 is activated to close the contact 14. Open contact 15. Next, the operating rod 17 of the switch 8 is actuated to close the contact 15, and at the same time, the channel opening/closing device 9 is opened, and the water stored in the water tank 1 is supplied into the water supply channel 4. [0022] The supplied water is already heated or is heated by passing through a heating section and is filled up to the water level of the water supply tank 1 in the water rising section 13 of the water supply channel 4. Furthermore, the water in the water supply channel 4 is locally heated by the heating section 5 to generate bubbles, and hot water is supplied to the coffee brewing chamber 6 by the action of the check valve 2. [0023] In this way, by preheating the heating section 5 while coffee beans are being ground, the coffee extraction chamber 6 is heated.
The hot water supplied can be supplied at a higher temperature than at the beginning of coffee extraction. Therefore, the coffee liquid extracted in the coffee extraction chamber 6 has a high temperature and is stored in the container 3. In addition, since the heating section 5 is preheated during coffee bean grinding in the coffee extraction procedure, there is no need to take time to preheat the heating section 5. [0024] A similar effect can also be obtained with a device that opens the channel opening/closing device by sensing the temperature of the heating section. (0025) (Example 2) Figure 3 shows an electric circuit diagram of the electric coffee maker of the present invention.The circuit configuration includes a 50W motor and an 800W heater connected in parallel, and a switch. 8
The contact 14 on the motor side and the contact 15 on the heater side can be opened and closed as desired. [0026] If the contact pressure is insufficient when the contacts open and close, the contacts will not be able to make sufficient contact and an arc will occur between the contacts. When arcing occurs between contacts due to insufficient contact pressure, a high current value causes the temperature of the contacts to rise abnormally, causing problems such as contact welding. [00271 As shown in FIG. 2, the switch 8 has a contact piece 18 having a contact 14 of the motor circuit and a contact 1 of the heating section circuit.
an operating rod 16 that opens and closes the circuit by simultaneously operating the contact pieces 19 with 5; and the contact piece 1 with the contacts 15 of the heating section circuit;
It is composed of an operating rod 17 that opens and closes only 9. Also,
The contact distance X when the contact 15 is open is set smaller than the contact distance y when the contact 14 is open. [0028] In the above configuration, when the operating rod 16 is operated at the shift A, currents of 0.5 A and 8 A flow through the motor circuit and the heating section circuit, respectively. At this time, since the contact distance X when the contact 15 is open is set smaller than the contact distance y when the contact 14 is open, the contact piece 19 is deformed, and the contact 15 through which a large current flows is set to a contact larger than the contact 14. Since force is applied, it is possible to prevent arcing between the contacts, and the temperature of the contacts 15 is likely to rise.
temperature rise can be prevented. [0029] (Embodiment 3) As shown in FIG. 2, the switch 8 is connected to the contact 1 of the motor circuit.
A biasing member 2 that opens and closes a circuit by simultaneously operating a contact piece 18 having a contact point 18 having a contact point 15 of a heating section circuit and a contact piece 19 having a contact point 15 of a heating section circuit.
The operating rod 17 is biased by a biasing member 21 that opens and closes only the contact piece 19 having the contact 15 of the heating section circuit. [00301 Furthermore, the biasing force of the biasing member 21 is set to be larger than the biasing force of the biasing member 20. In the above configuration, when the operating rod 16 of the switch 8 is actuated, the energization of the heating unit 5 can be recognized by the rotation of the motor 11, and when the operating rod 17 is actuated, the urging force of the urging member 21 applies the urging force. Since the biasing force of the member 20 is set larger than that of the member 20, a conscious operating force is required, so that the energization of the heating unit 5 can be recognized. In this way, by making the user aware that the heating section 5 is energized, injuries such as burns can be prevented. [00311] [Effect of the invention] As is clear from the above embodiments, the first
a coffee bean grinding chamber having a cutter linked to a motor for grinding coffee beans; a tank capable of storing water; a heating section for heating water in the tank; and a heating section for heating the water from the tank. By installing a flow path switching device that operates in conjunction with the heating section switch and a check valve in the middle of the water supply channel that passes through and reaches the coffee brewing chamber, hot water can be supplied to the coffee brewing chamber from the initial stage of discharge. of coffee liquid can be obtained. [0032] Furthermore, by preferentially closing the contacts of the switch of the circuit of the heating section of the second means and the switch of the circuit of the motor, the contact of the circuit with the higher input power is closed, thereby reducing the input power. It is possible to prevent an abnormal temperature rise at the contact point of the higher circuit. [00331 Furthermore, a contact point of a switch of a circuit of a heating part,
An operating body having a biasing member that can simultaneously close the contacts of the switch of the motor circuit, and a switch contact of only the switch of the heating section circuit, and the contact of the circuit of the two circuits. By providing an operating body with a biasing member having a force larger than the biasing force for closing, the user can easily recognize that the heating section is energized, and injuries such as burns can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a detailed sectional view of an electric coffee maker according to an embodiment of the present invention.

FIG. 21 (a) Switch side sectional view of the embodiment of the present invention (b) Same front sectional view [FIG. 3] Circuit diagram of the embodiment of the present invention

[Figure 4] Detailed cross-sectional view of a conventional electric coffee maker

[Explanation of symbols]

1 Water tank 2 Check valve 4 Water supply pipe 5 Heating part 6 Coffee extraction room 9 Flow path switching room 14 Contact 15 Contact 16 Operation rod 17 Operation stick 20 Biasing member 21 Biasing member

[Figure 4]

Claims (3)

[Claims] 1. A tank capable of storing water, a water supply channel leading from the tank to a coffee brewing chamber, a heating section that heats the water in the tank in the middle of the water supply channel, and a heating section that heats the water in the tank after being energized. An electric coffee maker comprising an operative channel opening/closing device between the tank and the heating section. 2. The electric coffee maker according to claim 1, wherein among the contact points of the switch in the circuit of the heating section and the contact points of the switch in the circuit of the motor, the contact of the circuit with higher input power is closed preferentially. 3. An operating body having a biasing member that can simultaneously close the switch contacts of the heating section circuit and the switch contacts of the motor circuit, and a circuit including only the switch contacts of the heating section circuit. The contacts of the switch can be closed,
2. The electric coffee maker according to claim 1, further comprising an operating body having a biasing member having a force larger than the biasing force for closing the contacts of the two circuits.