JPH0455385Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to a switch device for an electric water heater, and particularly to a switch structure equipped with a push button.

(Prior Art) Conventionally, for example, a switch device used in an electric pot has been installed at the lower side of the case of the electric pot. A switch and a printed wiring board are placed on the back side of the film sheet, and the switch is switched by pushing the film sheet surface. On the other hand, this film sheet provides a waterproof structure that prevents water from entering the interior where the switch and printed wiring board are located.

(Problems to be solved by the invention) As mentioned above, conventional electric pot switch devices generally have a switch structure that uses a film sheet to achieve a waterproof structure, and a switch structure that uses a push button. I stopped talking. In other words, in a switch structure using a push button, the switch is directly pressed by pressing the push button to change the switch, so there is a gap between the push button and the cover that supports the push button so that it can be pushed.
This is because there is a risk that water may enter the interior through this gap and cause damage to the switch and printed wiring board due to short circuits.

The present invention was developed in view of the above points, and is intended to provide a switch device for electric water heaters that can secure high waterproof performance and protect printed wiring boards, etc. even if the switch structure uses a push button. The purpose is to provide

[Structure of the idea]

(Means for Solving the Problems) The present invention includes a push button that is movably provided on a cover forming an outer shell, and a switch that is disposed inside the cover and is operated by pressing the push button. a printed wiring board having a printed wiring board; a gasket covering the front surface of the printed wiring board facing the cover, and having a close contact portion having a substantially U-shaped cross section on the peripheral edge to tightly fit onto the peripheral edge of the printed wiring board; The printed wiring board is attached to the inside of the cover, covers the rear surface of the printed wiring board, and the rear surface and circumferential surface of the tight fitting part of the gasket, which is tightly fitted to the printed wiring board at the periphery, are tightly fitted. The switch case is provided with a fitting portion having a substantially L-shaped cross section.

(Function) In the present invention, the printed wiring board is liquid-tightly surrounded by the gasket and the switch case, and in particular, the contact area on the peripheral edge of the gasket and the fitting area on the peripheral edge of the switch case are connected to the rear surface of the contact area and the fitting area on the peripheral edge of the switch case. Since the two circumferential surfaces are tightly fitted, high waterproof performance can be obtained and the printed wiring board can be positioned. When the push button is pressed, the gasket is elastically deformed to operate the switch on the printed wiring board.

(Embodiment) Hereinafter, the configuration of an embodiment of the present invention will be described with reference to the drawings.

In the figure, reference numeral 1 denotes an electric pot, and the electric pot 1 is equipped with a liquid container 2 that is open on the top surface and stores liquid such as water. A leg frame 4 is provided at the bottom of the case 3, and an annular lid holder frame 5 is provided at the top of the case 3. The top of the electric pot 1 is provided with an inner lid that tightly fits onto the upper end of the liquid container 2 and an air-type pump mechanism that applies air pressure to the inside of the liquid container 2. A lid body 8 is provided so as to be openable and closable. A hot water delivery member (not shown) equipped with a communication pipe or the like that communicates the inner bottom of the liquid container 2 with the hot water outlet 7 is connected to the liquid container 2.
and case 3.

Further, a heater (not shown) is provided around the outer periphery of the liquid container 2 to apply heat to the liquid contained in the liquid container 2 to boil it or keep it warm.

A cover 9 is provided on the outside of the spout 7, and the cover 9 includes a spout cover 9a that covers the spout 7 and a case cover 9b that covers the outer surface of the case 3. A switch device 11 is provided at 9b.

The switch device 11 includes a pair of push buttons 1
2, this push button 12 has locking claws 14 protruding from the upper and lower parts of the edge 13, and
A switch pushing part 15 protrudes from the center of the inner surface, and the case cover part 9 of the cover 9
The switch is slidably inserted into the recess 16 formed in the recess 16, and the locking pawls 14 are fitted through the locking holes 17 at the upper and lower parts of the inside of the recess 16, and the switch pushing portion 15 is inserted into the recess 16. It is fitted through a through hole 18 at the center of the inner side and is biased outward by a spring 19 disposed between it and the recess 16 .

A printed wiring board 21 is disposed facing the inside of the case cover part 9b to which the push buttons 12 are attached, and the switch pushing parts 15 of each of the push buttons 12 are provided on the front surface of the printed wiring board 21.
A low-voltage mechanical key switch type switch 22 which is pressed by the switch 22 is connected to the switch 22, and a connector 23 from which a connector cord 23a is pulled out is connected to the lower side of each switch 22.

A packing 24 covers the front surface of this printed wiring board 21. This Patsukin 24 is
A rectangular switch surrounding portion 26 and a connector surrounding portion 27 surrounding each switch 22 and connector 23 are formed on a flat plate portion 25 made of elastic material such as silicone rubber and in contact with the front surface of the printed wiring board 21. Further, a contact portion 26 having a substantially U-shaped cross section is formed on the peripheral edge of the flat plate portion 25 and is closely fitted to the inner and outer surfaces of the peripheral edge of the printed wiring board 21 . Note that a protrusion 29 is provided inside the switch surrounding portion 26 facing the front surface of the switch 22.
A cord hole 27a for pulling out the connector cord 23a is formed on the side of the connector surrounding portion 27, and the cord hole 27a is adapted to be in close contact with the outside of the connector cord 23a.

Further, a switch case 30 covers the rear surface of the printed wiring board 21. The switch case 30 is made of synthetic resin such as polypropylene, and the contact portion 28 of the gasket 24 fitted onto the peripheral edge of the printed wiring board 21 is in close contact with the peripheral edge of the cover portion 31 that covers the rear surface of the printed wiring board 21. A fitting part 32 that fits is formed, and this fitting part 32
A flange portion 33 is provided to protrude from the upper and lower edges. The fitting part 32 is formed into a substantially L-shaped cross section so that the rear surface and the circumferential surface of the contact part 28 of the packing 24 are closely fitted.

Further, a support piece 34 and a mounting boss 35 are protruded from the inner surface of the case cover portion 9b of the cover 9, and the packing 24 on the front surface of the printed wiring board 21 comes into contact with the tip of the support piece 34, and the mounting boss 35 The flange portion 33 of the switch case 30
is tightened and fixed by a mounting screw 36.

A display section 41 is provided on the front surface of the outlet cover section 9a of the cover 9, and a plurality of display lamps 42 are arranged vertically in parallel.

In addition, each push button 1 of the above-mentioned switch device 11
Reference numeral 2 indicates a re-boiling button to boil water, a timer button to temporarily turn off electricity to the heater and then turn on electricity to the heater again after a certain period of time, and a display unit 4.
Each indicator lamp 42 of 1 is a boiling lamp, a heat retention lamp, a timer lamp for each set time for re-energizing the heater, etc.

Further, a liquid level window 43 is provided on the side of the tap port 7 of the case 3, and the liquid level of the liquid contained in the liquid container 2 can be visually confirmed from the outside through the liquid level window 43. Water supply lamp 44 at the bottom of 43
is provided.

Then, in assembling the switch device 11 configured as described above, the front surface of the printed wiring board 21 is covered with the gasket 24, and the contact portion 28 of the gasket 24 is attached to the peripheral edge of the printed wiring board 21. This is assembled from the front side of the switch case 30, and the contact part 28 of the gasket 24 is press-fitted into the fitting part 32, and then the push button 12 is fitted.
The switch case 3 is inside the cover 9 in which the switch case 3 is installed.
0, and attach the flange part 3 of the switch case 30.
3 is tightened and fixed with the mounting screw 36.

In this assembled state, the packing 24 and the switch case 30 liquid-tightly surround the printed wiring board 21, and in particular, the contact portion 28 on the peripheral edge of the packing 24 and the fitting portion 32 on the peripheral edge of the switch case 30 are
Since the two surfaces, the rear surface and the circumferential surface of the contact portion 28 are closely fitted, high waterproof performance can be obtained. Furthermore, the printed wiring board 21 is positioned by fitting the contact portion 28 of the gasket 24 into the fitting portion 32 of the switch case 30 and by causing the support piece 34 to abut the gasket 24.

By pressing the push button 12, the push button 12 is pushed into the recess 16 of the cover 9 against the spring 19, and the push button 12 is pushed into the recess 16 of the cover 9.
The second switch pushing part 15 presses the switch surrounding part 26 of the gasket 24 to bend it, and the protrusion 29 of this switch surrounding part 26 comes into contact with the switch 22 to switch the switch. In addition, push button 12
When the pushing operation is released, the push button 12 is pushed back to the outside by the spring 19, and the switch surrounding part 26 of the gasket 24 is released from the push by the switch pushing part 15 of the push button 12.
Returns to the original shape before deflection deformation.

On the other hand, as shown in FIG.
If it overfills the surface of the cover 9 and leaks from the recess 16 to the locking hole 17 and the through hole 1.
Even if the liquid w enters the inside through 8, the printed wiring board 21 and switch 22 which are hermetically housed in the gasket 24 and switch case 30 will be damaged.
This prevents damage caused by short circuits, etc.

In addition, since the switch device 11 is located on the side of the hot water outlet 7 at the top of the electric pot 1, the push button 12
It is easy to push and move, and this outlet 7
A display section 41 is also provided, and various display lamps 42 can be easily viewed.

[Effects of the invention] According to the invention, the front side facing the push button of the printed wiring board is covered with a gasket, and the rear surface is covered with a switch case, and in particular, the tight fitting part of the peripheral edge of the gasket and the peripheral edge of the switch case are fixed. Department and
Since the two surfaces, the rear surface and the circumferential surface of the contact part, are tightly fitted, high waterproofness can be achieved without affecting the switch operation by push button operation, and the printed wiring board can be positioned in the switch case. can.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an embodiment of the switch device for an electric water heater of the present invention, Fig. 2 is an exploded perspective view thereof, and Fig. 3 is a partial perspective view of an electric pot incorporating the switch device. FIG. 4 is a perspective view of the entire structure. 9...Cover, 12...Push button, 21...
Printed wiring board, 22... Switch, 24...
Packing ring, 28...adhesive part, 30...switch case, 32...fitting part.

Claims (1)

[Scope of Claim for Utility Model Registration] A printed wiring board having a push button that is movably provided on a cover forming an outer shell, and a switch that is disposed inside the cover and is operated by pressing the push button. and a gasket which covers the front surface of the printed wiring board facing the cover and has a contact portion having a substantially U-shaped cross section on the peripheral edge to tightly fit onto the peripheral edge of the printed wiring board; The packing is attached to hold the printed wiring board, covers the rear surface of the printed wiring board, and is closely fitted to the printed wiring board at the periphery.The seal has an approximately L-shaped cross section in which the rear surface and circumferential surface of the tight fitting part are tightly fitted. 1. A switch device for an electric water heater, comprising: a switch case having a fitting portion.