JPH041861Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a hot plate used in a drip-type coffee brewer.

2. Description of the Related Art In general, the hot plate of a drip-type coffee brewer is provided with a temperature fuse as a safety device to prevent the temperature of the hot plate from rising excessively, and it has been necessary for this temperature fuse to operate reliably.

The conventional hot plate of this type of coffee brewer is, for example, as shown in Japanese Utility Model Application Publication No. 1439/1983.
The structure was as shown in Figures 4 and 5.

That is, the heating pipe 2 and the sheathed heater 3 are fixed to the hot plate 1 by caulking, and a thermo mounting part 4 is provided in a part of the hot plate 1, and the temperature of the hot plate 1 is controlled by the thermo mounting part 4. A thermostat 5 is attached, and a temperature fuse 6 is attached to the heat plate 1 to prevent excessive temperature rise in order to maintain safety when the thermostat 5 malfunctions. The temperature fuse 6 is connected to the terminal 7 and the other end is connected to the terminal 8 of the thermostat 5, and the temperature fuse 6 maintains a constant distance A between the hot plate 1 and the sheathed heater 3, and They were installed facing each other.

Problems to be Solved by the Invention In such a conventional configuration, it is difficult to maintain a constant distance A between the temperature fuse 6, the hot plate 1, and the sheathed heater 3. For example, if the distance A is small, The temperature of the temperature fuse 6 tends to rise, and the temperature fuse 6 blows out even under normal usage conditions, making it impossible to reuse it. Conversely, if the distance A is large, the temperature of the temperature fuse 6 becomes difficult to rise. Therefore, the melting of the temperature fuse 6 is delayed, and if an abnormality such as a short circuit occurs in the thermostat 5, the temperature fuse 6 may not operate properly and the heating plate 1 or the main body may be burnt out, resulting in safety issues. The device was inadequate.

In addition, even if the distance A between the temperature fuse 6, the hot plate 1, and the sheathed heater 3 is controlled and adjusted using a gap gauge, etc., in order to keep the distance A between the temperature fuse 6, the hot plate 1, and the sheathed heater 3 as constant as possible, this work takes time and causes variations in work. There were problems such as it was difficult to maintain a certain distance.

This invention solves these problems,
To provide a highly safe hot plate for a coffee boiler, capable of keeping the distance between the hot plate and the temperature fuse constant without requiring adjustment during work, and allowing the temperature fuse to operate reliably. The purpose is to

Means for Solving the Problems In order to solve the above problems, the present invention provides convex ribs with rounded tips at positions that support substantially both ends of the temperature fuse of a hot plate having a sheathed heater and a heating pipe. The temperature fuse is attached with the convex rib pressed against the insulating tube covering the temperature fuse.

Effect According to the above configuration, the temperature fuse is attached with the insulating tube covering the temperature fuse pressing against the convex rib of the hot plate, so the distance between the temperature fuse and the hot plate can be adjusted during work. This makes it possible to always set the dimensions to a constant value without the need for a temperature fuse, and as a result, it is possible to improve work efficiency.In addition, it is possible to prevent the temperature fuse from melting during normal use due to variations in the distance between the temperature fuse and the hot plate. Furthermore, even in the event of an abnormality such as a short circuit in the thermostat, the temperature fuse operates reliably, thereby improving safety.

Embodiment Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In FIGS. 1 to 3, 11 is the main body of a drip-type coffee boiler, and the heat source of this coffee boiler is a sheathed heater 12 bent in a substantially U-shape and a metal pipe 13. Hot plate 1 made of cast aluminum alloy etc.
4, one end of the heating pipe 13 is connected to a water tank 15, and the other end is connected to a discharge pipe 17 for pouring hot water into the coffee grounds 16. A thermostat 18 for temperature control is attached to the hot plate 14, and between a terminal 18a on one side of the thermostat 18, a terminal 18a on one side of the sheathed heater 12, and a terminal 12a on one side of the sheathed heater 12. A temperature fuse 19 for preventing the temperature of the hot plate 14 from rising excessively is attached thereto, and this temperature fuse 19 is covered with an insulating tube 20. Further, the heat plate 14 is provided with a convex rib 21 having a round tip at a position where the temperature fuse 19 faces and supports substantially both ends of the temperature fuse 19, and the height of the convex rib 21 is equal to that of the insulating tube. The position of the terminal 12a on one side of the sheathed heater 12 and the thermostat 18 is set so that the insulating tube 20 presses against the convex rib 21 when the temperature fuse 19 covered with a thermostat 20 is installed. A gap 22 is formed between the heat plate 19 and the hot plate 14. In addition, the first
In the figure, the convex rib 21 is formed into a continuous frame shape.

A glass container 23 is placed on the hot plate 14 via a heat insulating plate 24, and is used to store extracted coffee liquid.

The operation of the above configuration will be explained next.
The water in the water tank 15 flows into the heating pipe 13,
The water flowing into the heating pipe 13 is heated by the sheathed heater 12, boils and expands, and is discharged to the discharge pipe 17.
The coffee powder 16 is poured into the coffee powder 16 from the open end of the cup, and the coffee liquid is stored in the glass container 23. Also, when the water in the water tank 15 runs out and the water supply to the heating pipe 13 stops, the temperature of the hot plate 14 rises, and the thermostat 18 attached to this hot plate 14 operates to supply water to the sheathed heater 12. energization is stopped. When the temperature of the hot plate 14 decreases due to this energization stop, the thermostat 18 operates again to energize the sheathed heater 12, and by repeating this operation, the coffee liquid in the glass container 23 is maintained at a predetermined temperature. dripping

Furthermore, if the thermostat 18 becomes short-circuited due to some abnormality and the sheathed heater 12 is constantly energized, the temperature of the hot plate 14 will rise abnormally, and as a result, There is a risk that the hot plate 14 and the main body 11 may burn out or cause a flame, but in such a case, the temperature fuse 19 prevents the temperature of the hot plate 14 from rising too much. That is, when the temperature of the hot plate 14 reaches a predetermined temperature or higher, the temperature fuse 19 is opened and the power supply to the sheathed heater 12 is stopped, thereby ensuring safety. The operating temperature of this temperature fuse 19 is set to such a temperature that it does not operate under normal usage conditions, but opens when the temperature of the hot plate 14 and main body 11 rises to a temperature before burning out. Therefore, it is necessary to maintain a constant distance between the temperature fuse 19 and the hot plate 14. In one embodiment of the present invention, an insulating tube 2 covering the temperature fuse 19 is used.
Since the temperature fuse 19 is attached so that the temperature fuse 19 presses the convex rib 21 provided on the hot plate 14, the distance between the temperature fuse 19 and the hot plate 14 can always be kept constant, and as a result, the temperature is always stable. It is possible to operate the temperature fuse 19 according to the specified temperature, thereby ensuring safety. Further, since the tips of the convex ribs 21 are rounded, there is less variation in the way heat is transferred from the hot plate due to changes in the contact state. Furthermore, since there is no need to adjust the distance between the temperature fuse 19 and the hot plate 14 during work, work efficiency can be improved. Note that this distance can be easily changed by changing the height of the convex rib 21 provided on the hot plate 14, and as a result, the set temperature of the temperature fuse 19 can also be easily changed.

Effects of the invention As described above, according to the invention, there is a heating plate having a sheathed heater and a heating pipe, a thermostat for temperature control provided on the heating plate, one end of which is connected to the terminal of the sheathed heater, and the other end of which is connected to the thermostat. a temperature fuse connected to the heat plate and covered with an insulating tube, and a convex rib with a round tip is provided at a position supporting substantially both ends of the temperature fuse of the hot plate; The temperature fuse is installed with the insulating tube covering the temperature fuse pressed, and a certain gap is provided between the temperature fuse and the hot plate, so the distance between the temperature fuse and the hot plate must be adjusted during work. It is possible to maintain constant dimensions at all times without having to heat the fuse, resulting in stable temperature and operation of the fuse, which improves safety and prevents the temperature fuse and hot plate Since there is no need to adjust the distance, work efficiency can also be improved.

[Brief explanation of the drawing]

Fig. 1 is a plan view of a hot plate of a coffee boiler showing an embodiment of the present invention, Fig. 2 is a sectional view of the same main part, and Fig. 3
The figure is a side sectional view of a coffee boiler employing the same heating plate, FIG. 4 is a plan view of the hot plate of the conventional coffee boiler, and FIG. 5 is a sectional view of the same essential part. 12... Sheathed heater, 13... Heating pipe, 14... Hot plate, 18... Thermostat, 1
9...Temperature fuse, 20...Insulation tube, 2
1...Convex rib.

Claims (1)

[Scope of utility model registration request] a hot plate having a sheathed heater and a heating pipe;
The heating plate has a thermostat for controlling temperature, and a temperature fuse whose one end is connected to the terminal of the sheathed heater and the other end is connected to the thermostat and is energized toward the heating plate. The heating plate is covered with an insulating tube, and the heating plate is provided with a convex rib at a position supporting substantially both ends of the temperature fuse, the tip of the convex rib is round, and the temperature fuse is covered with the convex rib. A heating plate for a coffee brewer that is attached with an insulating tube pressed against it, with a certain gap between the temperature fuse and the heating plate.