JPH10172723A - Mat heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable complete water proofing. SOLUTION: A first cover member 1 of a main body has a first through hole 15 leading a power cord 9 to the inside and has a sheet material 17 bonded to the first cover member 1 so as to cover the first through hole 15, the sheet material 17 is bonded to the first cover member 1 at a peripheral rim 17 thereof and has a second through hole 19 for introducing the power cover 9 to the first through hole 15, and the first and second through holes 15 and 19 are closed with water-tightness between the first cover member 1 and the sheet material 17, and a sealing member 21 fixing the power cord 9 is sealed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mat heater having a waterproof structure, and more particularly to a mat heater suitable for heating in a place where water splashes.

[0002]

2. Description of the Related Art As shown in FIG. 10, a conventional mat heater has a main body 105 having insulating first and second cover members 101 and 103 facing each other, and an electric power housed inside the main body 105. Heater 107 and electric heater 10
7 is connected to a power cord 109.

[0003] First and second cover members 101 and 103
Are joined to each other.
The power cord 109 is attached to the first cover member 101 with the main body 5.
Is formed with an insertion hole 115 for leading from the outside to the inside.

The electric heater 107 is connected to a power cord 109. The electric heater 107 and the power cord 109 are connected to each other at a connection portion in the main body 105 near the periphery of the main body 105.

[0005] The body 105 is provided with a protective case 125 which covers the connection portion from the outside in the vicinity of the periphery of the body 105. The protective case 125 is the first cover member 1
01 is partially opposed to the first case portion 127a
And a first case portion which is partly opposed to the second cover member 103 and is related to a part of the peripheral portions 101a, 103a of the first and second cover members 101, 103 so as to sandwich the main body 105. And a second case portion 127b which is overlapped with the second case portion 125a and fixed to each other.

The power cord 109 is provided in the protective case 125.
And the power cord 109 is connected to the first insertion hole 1.
15 into the main body 105.

The main body 105 has an insulating first inner member 131 disposed inside the first cover member 101 and a second inner member 133 disposed inside the second cover member 103. ing.

The electric heater 107 includes the first and second inner members 1.
31 and 133 are arranged.

The first and second case portions 127a, 127
b are mutually fixed by a screw member 143 that passes through a screw hole 141 formed in the main body 105. Also, the first
The second case portions 127a and 127b are fixed to each other by a second screw member 145 at a portion different from the portion fixed to each other by the first screw member 143.

[0010]

However, the main body 1
The first and second cover members 101 and 103, the first and second inner members 131,
Since only a hole has been made in 133, the protective case 125
Screw member 143 from the protective case 125 that is exposed to water
Water penetrates into the inside of the main body 105 through the air passage, so that there is a problem that water is applied to a connection portion between the electric heater 107 and the power cord 109.

Further, when water is applied to the protective case 125, water enters from the outside of the protective case 125 and enters the inside of the main body 105 through the insertion hole 115, so that the electric heater 107 and the power cord 109 There is a problem that water is splashed on the connection part of.

Further, since the power cord 109 is only inserted through the insertion hole 115 of the main body 5, the power cord 10
9 can be securely held at a predetermined position. If a force is applied during the assembling work, the connection portion will be poorly connected.

When the mat heater is used only for general heating, there is no problem if a safety device is provided even if it has a conventional structure. Particularly, when the mat heater is used in a place where water is used, such as a toilet or a kitchen, Requires a more complete waterproof structure.

However, in the mat heater having such a configuration, the first and second cover members 10 of the main body 105 are provided.
Although it is relatively easy to join the peripheral portions 101a, 103a of the first and the third to each other in a watertight manner, the electric heater 10
It is difficult to completely waterproof the connection between the power cord 7 and the power cord 109.

That is, since the power cord 109 has the insertion hole 115 and the screw hole 141, these parts are completely closed and waterproofed in consideration of assemblability, a simple structure, economy, and the like. Technology is required.

Therefore, an object of the present invention is to provide an excellent assemblability,
An object of the present invention is to provide a mat heater capable of being completely waterproofed in consideration of a simple structure and economy.

[0017]

According to the present invention, a body having insulating first and second cover members facing each other, an electric heater housed in the body, and a connection to the electric heater are provided. Power cord, and the first
And a mat heater in which peripheral portions of the second cover member are joined to each other in a watertight manner, wherein the first cover member has a first insertion hole for guiding the power cord from the outside to the inside of the main body, A sheet material joined to the first cover member is provided on the first cover member so as to cover the first insertion hole, and a peripheral portion of the sheet material is provided on the first cover member. A second insertion hole which is joined and introduces the power cord into the first insertion hole, wherein the first and second insertion holes are provided between the first cover member and the sheet material; A mat heater is provided, in which a sealing member for closing the hole in a watertight manner and fixing the power cord between the first cover member and the sheet material is sealed.

[0018]

When water is applied to the outer surfaces of the first and second case portions, since the second insertion hole is completely sealed by the sealing member in the power cord portion, the water enters the protection case. Even if water enters, water cannot enter the inside of the main body.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mat heater according to the present invention will be described below with reference to the drawings. 1 and 2 show the appearance of a mat heater according to an embodiment of the present invention.

First, referring to FIGS. 1 and 2, the mat heater includes a main body 5, a protective case 25 attached to a part of a peripheral portion of the main body 5, and a main body held by the protective case 25. 5 is provided with a power cord 9 introduced inside.

As shown in FIGS. 3A and 3B, the main body 5 has insulating first and second cover members 1 and 3 facing each other. An electric heater 7 is provided inside the main body 5.

Furthermore, the main body 5 has an insulating first inner member 31 disposed inside the first cover member 1 and a second inner member 33 disposed inside the second cover member 3. doing. The first and second cover members 1 and 3 are made of heat-sealable PVC.
And other resin sheet materials. Further, the first and second inner members 31, 33 employ a felt material.

First and second cover members 1 and 3 of main body 5
As shown in FIGS. 3B and 4, the peripheral portions 1a and 3a are water-tightly joined by heat welding these portions to each other.

As shown in FIG. 4, one of the electric heaters 7 is connected to a power cord 9 and the other is connected to a temperature controller. The electric heater 7 is disposed in a meandering manner on the first inner member 31 and is sandwiched between the first and second inner members 31 and 33. Then, as shown in FIGS. 3A and 3B, the second inner member 33 and the second cover member 3 are bonded by an adhesive tape 51 such as a double-sided adhesive tape. I have.

Next, the structure of the connecting portion between the electric heater 7 and the power cord 9 will be described with reference to FIGS.

The first cover member 1 is formed with a pair of first insertion holes 15 for guiding the power cord 9 from outside to inside the main body 5. Further, the first cover member 1 is provided with a sheet material 17 joined to the first cover member 1 so as to cover the first insertion hole 15.

The sheet member 17 has a peripheral portion 17a joined to the first cover member 1 and a pair of second insertion holes 19 formed for introducing the power cord 9 into the first insertion hole 15. ing. Between the first cover member 1 and the sheet member 17, the first and second insertion holes 15, 19 are closed in a watertight manner, and the power cord 9 is connected to the first cover member 1.
Further, a sealing member 21 which is a thermoplastic material fixed between the sheet materials 17 is enclosed.

The sheet member 17 has a sheet hole 17b for injecting the sealing member 21 between the first cover member 1 and the sheet member 17, and an additional sheet member 18 for sealing the sheet hole 17b. ing.

As shown in FIGS. 2, 4, 5 and 7, the protective case 25 is disposed near the periphery of the main body 5 at the connection portion where the power cord 9 is connected to both ends of the electric heater 7.
In the vicinity of the periphery. This protective case 2
Reference numeral 5 denotes a first case portion 27 that partially faces the first cover member 1, and first and second portions that partially face the second cover member 3 and sandwich the main body 5. It has a second case part 28 which is superimposed on the first case part 27 and fixed to each other with respect to a part of the peripheral parts 1a, 3a of the two cover members 1, 3.

The power cord 9 is introduced into the protective case 25, and the power cord 9 is inserted through the first insertion hole 15 into the second
Is inserted into the insertion hole 19 through the sealing member 21 and is fixed by the sealing member 21. The power cord 9 is introduced from the first insertion hole 15 to the second insertion hole 19 via the sealing member 21 and is connected to the electric heater 7.

The first and second case portions 25 and 27 are fixed to each other by a pair of first screw members 43 penetrating a pair of first screw holes 41 formed in the main body 5.

A first case screw hole 53 is formed in the first case portion 25 at a position corresponding to the pair of first screw holes 41 formed in the main body 5. A second case screw hole 54 is formed in the second case 27 at a position corresponding to the pair of first screw holes 41 formed in the main body 5. The first screw hole 41 has a first screw insertion hole 45 formed in the first cover member 1 and a second screw insertion hole 47 formed in the second cover member 3. The peripheral portions 1b and 3b of the first and second screw insertion holes 45 and 47 are connected to each other in a watertight manner.

The first and second case portions 27, 28
Are fixed to each other by a pair of second screw members (not shown) at portions different from the portions fixed to each other by the first screw member 43. First and second case portions 27 and 28 fixed by these pair of second screw members.
Is indicated by reference numeral 55 in FIGS. 1, 4 and 5.

FIG. 8 shows a connection circuit between the electric heater 7 and the power cord 9. As shown in FIG. 8, the electric heater 7, the first temperature controller 61, the temperature fuse 63, the second temperature controller 65, and the resistor 67 are connected in series between the power sources. The first and second temperature controllers 61 and 65 are:
For example, it turns off at 60 ° C., and the thermal fuse 63 cuts off the circuit at 99 ° C.

Next, the operation of the waterproof structure of the mat heater will be described with reference to FIGS.

When water is applied to the outer surfaces of the first and second case portions 27 and 28, the power cord 9 has the second
Since the insertion hole 19 is completely sealed by the sealing member 21, even if water enters the protection case 25, water cannot enter the inside of the main body 5.

Even if water enters the first screw hole 4141 from the outer surface of the protective case 25 through the case screw hole 53, the peripheral portions 1b and 3b of the first and second screw insertion holes 45 and 47 are watertight. Since they are connected, water does not enter the interior of the main body 5.

FIG. 9 shows a state where the protective case 25 is viewed from the back side. A nameplate is attached to the front and back surfaces of the protective case 25. In particular, a nameplate is attached to the entire surface of the protective case 25.

[0039]

As described above, according to the embodiment of the present invention, according to the mat heater of the present invention, the second insertion hole 1
Since 9 is completely sealed by the sealing member 21, even if water enters the protective case 25, water cannot enter the inside of the main body 5.

Further, since the peripheral portions of the first and second screw insertion holes are connected to each other in a water-tight manner, water cannot enter the inside of the main body, so that complete waterproofing can be achieved.

Therefore, according to the mat heater of the present invention, a waterproof structure can be obtained with a simple configuration using the sealing member and the sealing sheet.

Further, since the peripheral portions of the first and second cover members having the screw holes of the main body are connected to each other, a waterproof structure can be obtained by a simple operation.

Further, since the power cord can be fixed by the sealing member, the positioning of the power cord with respect to the main body is ensured.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a mat heater according to the present invention.

FIG. 2 is a side view of the mat heater of FIG.

3A is a cross-sectional view showing an exploded main part of the main body of the mat heater shown in FIG. 1, and FIG. 3B is a cross-sectional view showing a main part of the main body of the mat heater shown in FIG. is there.

FIG. 4 is a plan view showing a state where a part of a main part of a back surface of the mat heater shown in FIG. 1 is partially sectioned.

5 is a plan view showing a part of a main part of the surface of the mat heater shown in FIG. 4;

FIG. 6 is a sectional view showing a connection portion of the mat heater of FIG. 5;

FIG. 7 is a cross-sectional view illustrating a main part of a protective case of the mat heater of FIG. 5;

FIG. 8 is a circuit diagram of the mat heater shown in FIG.

FIG. 9 is a plan view showing the back surface of the protective case of the mat heater shown in FIG. 1;

FIG. 10 is a cross-sectional view showing a protection case portion of a conventional mat heater.

[Explanation of symbols]

 1, 101 First cover member 3, 103 Second cover member 5, 105 Main body 7, 107 Electric heater 9, 109 Power cord 15 First insertion hole 17 Sheet material 17a Sheet hole 19 Second insertion hole 21 Sealing Stop member 25, 125 Protective case 27, 127a First case portion 28, 127b Second case 31, 131 First inner member 33, 133 Second inner member 43 First screw member 41 First screw hole 143 first screw member 145 second screw member

Claims (4)

[Claims] 1. A main body having an insulating first and second cover members facing each other, an electric heater housed in the main body, and a power cord connected to the electric heater. In a mat heater in which peripheral portions of the first and second cover members are joined to each other in a watertight manner, the first cover member has a first insertion hole for guiding the power cord from outside to inside of the main body. And a sheet material joined to the first cover member so as to cover the first insertion hole is provided on the first cover member, and a peripheral portion of the sheet material is the first material. A second insertion hole that is joined to the cover member and that introduces the power cord into the first insertion hole; the first and the second members are provided between the first cover member and the sheet material; When the 2 insertion holes are closed watertight Mat heater sealing member for fixing the power cord between said first cover member and the sheet material is characterized in that it is sealed. 2. The mat heater according to claim 1, wherein
The main body includes an insulating first inner member disposed inside the first cover member, and a second inner member disposed inside the second cover member, and the electric heater includes: The power cord is disposed between the first and second inner members, and the power cord is introduced into the protective case.
Characterized in that the mat heater is introduced into the second insertion hole from the insertion hole through the sealing member and connected to the electric heater. 3. The mat heater according to claim 1, wherein
The sheet material has a sheet hole for injecting the sealing member, which is a thermoplastic material, between the first cover member and the sheet material, and an additional sheet material for sealing the sheet hole. A mat heater characterized in that: 4. The mat heater according to claim 1, wherein
A connection part where the power cord is connected to both ends of the electric heater is arranged near the periphery of the main body, and a protection case covering the connection part near the periphery of the main body is provided. A first case portion partially facing the cover member of the first and second cover members and a first case portion partially facing the second cover member and sandwiching the main body; A second case part which overlaps with the first case part and is fixed to each other with respect to a part of the peripheral part, wherein the power cord is introduced into the protective case, and the power cord is A mat heater, being introduced from a first insertion hole to the second insertion hole via the sealing member and fixed by the sealing member.