JPH083971B2 - Push button switch - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a waterproof push button switch.

BACKGROUND ART Conventionally, the opening / closing operation portion of this type of push button switch has a structure as shown in FIG. That is, a handle (c) is arranged above the switch body (a), which is a contact opening / closing mechanism, and is biased upward so as to be movable up and down. The handle (c) is exposed from the exterior cover (b). It has a structure. The handle (c) is pushed against the urging force of a spring or the like to drive the actuator (d) of the switch body (a) to open and close the contacts of the switch body (a). In such a conventional example, the exterior cover (b) and the handle (c) are independent members, so that there is a problem that the number of parts is increased, and not only the cost of parts but also the cost of assembly is increased. Further, in order to be able to dispose this kind of push button switch in a humid place such as a bathroom, it is necessary to carry out a sufficient waterproof treatment.

[Object of the Invention] The present invention has been provided in view of the above points,
(EN) A push button switch intended to reduce the number of parts, simplify the assembly process, and enable sufficient waterproofing.

DISCLOSURE OF THE INVENTION (Structure) The present invention relates to a push button switch that has a case body that houses a contact opening / closing mechanism and an exterior cover, and that turns the contact opening / closing mechanism on and off by a pressing operation.
The case body has a flat plate-shaped base part on which the exterior cover is attached on the upper surface side, and a cylindrical boss part having a partition wall that projects from the substantial center of the base part to the lower surface side and divides the inside into upper and lower parts. And a ridge surrounding the outer peripheral edge of the storage recess that is open to the upper surface inside the boss, a sealing ridge that surrounds the ridge, and an inner periphery of the sealing ridge that surrounds the ridge. An engaging groove is provided on the base of the case body, and a sealing flange portion having an engaging protrusion that engages with the engaging groove at the outermost periphery and a flexible member which is higher in the center with respect to the sealing flange portion. An inner cover having a portion, and a frame-shaped pressing plate that exposes the flexible portion of the inner cover and presses it from above so that the upper surface of the sealing flange portion has substantially the same height as the upper surface of the sealing projection. A seal formed by the storage recess of the base and the flexible portion of the inner cover The contact opening / closing mechanism is housed in the space, and a wiring insertion hole for leading out a lead wire electrically connected to the contact opening / closing mechanism is provided in the partition wall of the boss portion and opened on the lower surface side of the boss portion. An adhesive is embedded in the embedding recess to fix the lead wire, and an opening / closing operation unit for pressing the contact opening / closing mechanism via the flexible portion of the inner cover is integrally formed via the exterior cover and the hinge portion. In addition, the waterproof packing that surrounds the outer peripheral edge of the base and the outer peripheral portion of the outer cover through the body peripheral protrusion that has an inverted U-shaped cross-section formed on the outer peripheral edge of the base is provided with the body peripheral protrusion. It is characterized in that the outer cover is attached to the case body by being fitted into.

(Example) Hereinafter, the Example of this invention is described with reference to drawings. FIG. 1 shows an example of a push button switch according to the present invention in cross section. This push button switch includes a case body 1 that houses a contact opening / closing mechanism. The state of the case body 1 as seen from diagonally above with other parts assembled is shown in FIG.
FIG. 3 shows the state of the case body 1 as viewed from diagonally above, with the switches remaining almost the same as most of the other parts except for the rest. As shown in these figures, the case body 1 is formed of a resin material, and includes a pedestal portion 2 having a square shape and a boss portion 3 protruding downward from the center thereof as a square tube as a main portion. . A storage recess 4 is formed at the center of the base 2 and has a rectangular opening when viewed from above. The housing recess 4 is formed in an upper opening shape, with the protruding portion of the boss portion 3 being partitioned by a partition wall 5 in the middle. A ridge 6 having a semicircular cross section is provided at a portion of the base 2 corresponding to the outer periphery of the storage recess 4, and the outer periphery of the ridge 6 is seen from a plan view on four sides. A sealing ridge 7 is provided so as to surround the shape. An engagement groove 8 is formed on the inner circumference of the sealing ridge 7.

A flexible inner cover 10 made of rubber or a special soft vinyl chloride resin material is installed in the center of the base 2 so as to be concentric with the storage recess 4. This inner cover 10 has a flexible part
11 is provided and a sealing flange portion 12 is provided on the outer periphery thereof. The flexible portion 11 is provided with recesses 13 corresponding to above the storage recesses 4 on the inside thereof in the protruding inside thereof.
The storage recess 4 forms a closed space. On the back surface of the sealing flange portion 12, there is formed a ridge (which is depressed by being pushed into the ridge 6 in the figure) 14 that abuts against the above-mentioned ridge 6, and at the outermost periphery of the sealing flange portion 12. An engaging protrusion 15 is formed which is engaged in the engaging groove 8. The upper surface of the sealing flange 12 is the base 2
While the upper surface of the sealing ridge 7 is pressed by a frame-shaped pressing plate 17 exposing the flexible portion 11 of the inner cover 10, the pressing plate 17 and the sealing ridge 7 are It is fixed by adhering it with an adhesive or an ultrasonic heating method. Thereby, the base part 2 and the flexible part 11
The space between is sealed, and the switch body (contact opening / closing mechanism) 20 is housed in this sealed space.

The switch body 20 is a microgap switch and is installed on a printed board 23 mounted in the storage recess 4. The actuator 21 protruding from the switch body 20 is close to the back surface of the flexible portion 11, and the printed board 23 has a lead wire 24 electrically connected to the switch body 20 as shown in FIG. The tip is connected. The lead wires 24 are led out to the outside through the wiring insertion holes 25 formed in the partition wall 5, respectively, and are connected to, for example, a notification device master device (not shown). An embedding recess 26 is formed in a portion of the boss portion 3 corresponding to the outside of the partition wall 5, and an adhesive 27 is embedded in the embedding recess 26. The adhesive 27 completely blocks ingress of moisture and the like from the side of the mounting box (not shown).

On the other hand, cover engaging protrusions 32 arranged at four points are provided on the upper surface of the case body 1. On the outer peripheral edge of the case body 1, a body peripheral edge protrusion having an inverted U-shaped cross section.
39 is formed, and the waterproof packing is provided through the protrusion 39.
40 and the exterior cover 41 are fitted and attached.
The waterproof packing 40 is made of a special soft vinyl chloride resin material,
Alternatively, a fitting protrusion 42 formed on a four-sided frame made of a rubber material and protruding on the upper surface thereof is provided with the body peripheral edge projection 39.
An insertion receiving groove 43 formed on the back surface side of the is inserted.
The waterproof packing 40 has a groove 44 on its back surface so as to effectively adhere to the surface of a building material such as a bathroom.
The mounting frame 45 for one mouth provided on the back surface of the case body 1 is screwed to the front surface of the mounting box, and the case body 1 is fixed to the mounting frame 45 by the mounting screws 46. The waterproof packing 40 adheres to the construction material.

As shown in FIG. 5, the outer cover 41 has a circular opening 47 in the center and a square contact step 48 on the outer periphery thereof. To be located within the opening 47,
A handle 35, which is an opening / closing operation unit for pressing the actuator 21 of the switch body 20, is provided.
35 is integrally formed with the exterior cover 41 and the hinge portion 50. Step 48 that integrates the handle 35 and hinge 50
Is made of flexible resin, and handle 35
Moves up and down with the hinge portion 50 as a fulcrum. An operation sheet 49 made of a polycarbonate resin film is attached to the contact step portion 48 by adhesion (or welding). When the operation sheet 49 is pushed, the handle 35 is pushed down, and the flexible portion 11 is pushed down via the handle 35, so that the handle 35
The pressing protrusion 36 protruding to the center of the back surface pushes down the actuator 21 via the flexible portion 11 to turn the switch body 20 on and off. Then, when the operation sheet 49 is returned, the handle 35 is returned by the return force of the hinge portion 50. As a result, the switch body 20 turns on and off. The exterior cover 41 is fitted to the outer periphery of the case body 1 and also engages with the cover engagement protrusion 32, whereby the exterior cover 41 is detachable and the internal space is hermetically sealed outside. . The lower end peripheral edge of the outer cover 41 is adapted to be in close contact not only with the case body 1 but also with the upper surface of the waterproof packing 40.

As mentioned above, the switch body 20
However, since it is incorporated in the space sealed by the case body 1 and the inner cover 10, the switch body 20 does not get into water or moisture.

[Advantages of the Invention] As described above, the present invention is a push button switch that has a case body that houses a contact opening / closing mechanism and an exterior cover, and that turns the contact opening / closing mechanism on and off by a pressing operation. The case body is provided with a flat plate-like base part to which the exterior cover is attached, and a tubular boss part having a partition wall that projects from the substantial center of the base part to the lower surface side and divides the inside into upper and lower parts, A ridge that surrounds the outer peripheral edge of the storage recess that opens to the upper surface side inside the boss portion, a sealing ridge that surrounds the ridge, and an engagement groove that surrounds the ridge on the inner periphery of the sealing ridge. Is provided on the base part of the case body, and is provided with a sealing flange part having an engaging protrusion on the outermost periphery that engages with the engaging groove, and a flexible part that is elevated in the center with respect to the sealing flange part. Inner cover and top of sealing flange Is provided with a frame-shaped pressing plate that exposes the flexible portion of the inner cover and presses it from above so that it is at substantially the same height as the upper surface of the sealing protrusion, and the storage recess of the base and the inner cover The contact opening / closing mechanism is housed in an enclosed space formed by the flexible portion, and a wiring insertion hole for leading out a lead wire electrically connected to the contact opening / closing mechanism is provided in the partition wall of the boss portion. At the same time, the lead wire is fixed by embedding an adhesive in the embedding recess opening on the lower surface side of the boss portion, and the opening / closing operation portion for pushing the contact opening / closing mechanism through the flexible portion of the inner cover is provided as the outer cover. And the outside of the exterior cover, which are integrally molded via the hinge part and the body part, and surround the outer peripheral edge of the base part through the body peripheral edge protrusion having an inverted U-shaped cross section formed on the outer peripheral edge of the base part. Fit the peripheral edge and the peripheral edge projection of the body Since the exterior cover is attached to the base body, the open / close operation part that doubles as the handle is integrally molded with the exterior cover as compared to the conventional case where the exterior cover and the handle are separate members. The number of points can be reduced, so that there is an effect that the cost can be reduced in terms of parts and assembly, and the contact opening / closing mechanism is housed in a closed space formed by the inner cover and the housing recess of the boss. Since the adhesive is embedded in the embedding recess on the lower surface side of the boss, and the waterproof packing is interposed in the gap between the case body and the exterior cover, water splashing or moisture may get into the contact opening / closing mechanism. There is no effect, and it is possible to achieve sufficient waterproofing.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same as above, FIG. 3 is an exploded perspective view of the same as above, and FIG. 4 is an exploded perspective view showing a mounting state of the switch main body above. FIG. 5 is an exploded perspective view of the same outer cover, and FIG. 6 is a sectional view of a conventional example. Reference numeral 1 is a case body, 41 is an exterior cover, and 50 is a hinge portion.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References Open 61-3426 (JP, U) Open 59-53733 (JP, U) Open 62-191035 (JP, U) Open 62- 65738 (JP, U)

Claims (1)

[Claims] 1. A push-button switch having a case body for accommodating a contact opening / closing mechanism and an exterior cover, the push-button switch turning on / off the contact opening / closing mechanism by a pressing operation.
The case body has a flat plate-shaped base part on which the exterior cover is attached on the upper surface side, and a cylindrical boss part having a partition wall that projects from the substantial center of the base part to the lower surface side and divides the inside into upper and lower parts. And a ridge surrounding the outer peripheral edge of the storage recess that is open to the upper surface inside the boss, a sealing ridge that surrounds the ridge, and an inner periphery of the sealing ridge that surrounds the ridge. An engaging groove is provided on the base of the case body, and a sealing flange portion having an engaging protrusion that engages with the engaging groove at the outermost periphery and a flexible member which is higher in the center with respect to the sealing flange portion. An inner cover having a portion, and a frame-shaped pressing plate that exposes the flexible portion of the inner cover and presses it from above so that the upper surface of the sealing flange portion has substantially the same height as the upper surface of the sealing projection. A seal formed by the storage recess of the base and the flexible portion of the inner cover The contact opening / closing mechanism is housed in the space, and a wiring insertion hole for leading out a lead wire electrically connected to the contact opening / closing mechanism is provided in the partition wall of the boss portion and opened on the lower surface side of the boss portion. An adhesive is embedded in the embedding recess to fix the lead wire, and an opening / closing operation unit for pressing the contact opening / closing mechanism via the flexible portion of the inner cover is integrally formed via the exterior cover and the hinge portion. In addition, the waterproof packing that surrounds the outer peripheral edge of the base and the outer peripheral portion of the outer cover through the body peripheral protrusion that has an inverted U-shaped cross-section formed on the outer peripheral edge of the base is provided with the body peripheral protrusion. A push-button switch, characterized in that the push-button switch is fitted into the case body and an outer cover is attached to the case body.