JPH0684640U - Push button switch - Google Patents

Abstract

(57) [Summary] [Purpose] The coil spring can press the part of the reversal part of the click spring with a large reversal amount without increasing the number of parts, or the coil spring can be used without damaging the dustproof property. By making it possible to elastically contact with the push button switch, it is possible to provide a push button switch that allows the reversing operation of the click spring to be clearly sensed and has a good operation feeling at a low cost. [Structure] The lower end of the coil spring 7 is provided with a pressing protrusion 7b for elastically urging the top of the click spring 6, and the coil spring 7 is used as a member for preventing dust from entering the lower case 3. A dustproof plate 10 such as a metal plate provided with a notch 10a for insertion is used, and the coil spring 7 is configured to elastically contact the click spring 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a push button switch having a movable contact, which uses a click spring that produces a click feeling when it is turned over, to reduce the number of parts and prevent dust from entering the contact portion to improve reliability.

[0002]

[Prior art]

 As a conventional example of this type of push button switch, a push button switch described in Japanese Utility Model Laid-Open No. 4-123031 will be described with reference to the sectional view of FIG.

In FIG. 1, a bottomed case 1 having an open upper end is a resin molded product formed by combining an upper case 2 and a lower case 3, and a cylinder is provided inside the outer wall of the upper case 2. The shaped portion 2a is provided upright, and the central fixed contact 4 and the peripheral fixed contact 5 are arranged on the inner bottom surface of the lower case 3 at positions separated from each other. A circular bowl-shaped click spring 6 facing the central fixed contact 4 so as to come in contact with and separated from the central fixed contact 4 is housed in the lower case 3 as a movable contact. The fixed contact 5 is located above the fixed contact 5 and is always in contact therewith. On the other hand, a coil spring 7 is housed in the tubular portion 2a of the upper case 2, and the upper end portion of the coil spring 7 is hung on the ceiling surface of the stem 8 and is attached to the inner wall surface of the tubular portion 2a. It is locked to the sliding shaft portion 8a which is in sliding contact. A flexible dustproof sheet 9 is provided between the upper case 2 and the lower case 3, and since the dustproof sheet 9 closes the upper opening 3a of the lower case 3, External dust is prevented from entering the lower case 3 in which the fixed contacts 4 and 5 and the click spring 6 are arranged, and a coil spring is provided around the top of the click spring 6 through the dustproof sheet 9. It has an elasticity of 7. The stem 8, which is held in the case 1 so as to be able to move up and down, ascends and descends while sliding the sliding shaft portion 8a with respect to the tubular portion 2a. Since the locking claw 8b is formed on the portion, there is no risk of falling off from the case 1.

When the push button switch thus configured is not operated, as shown in FIG. 4, the stem 8 is kept pushed up to the highest point by the elastic force of the coil spring 7. When the stem 8 is pushed downward against the elastic force of the coil spring 7 and the coil spring 7 is compressed by a predetermined amount, the central portion of the click spring 6 is inverted and comes into contact with the central fixed contact 4, and the click Since the switch-on state in which the central and peripheral fixed contacts 4 and 5 are passed through the spring 6 is realized, the operator switches from the switch-off state to the on-state by the click feeling generated when the click spring 6 is reversed. Can be realized. When the pushing operation force on the stem 8 is removed in this ON state, the stem 8 is pushed up to the uppermost point by the elastic force of the coil spring 7, and the click spring 6 returns to the original bowl shape by its elasticity. Then, since it is separated from the central fixed contact 4, the conduction between the central and peripheral fixed contacts 4 and 5 is released and the state returns to the switch-off state. Further, in such a push button switch, since dust is prevented from entering the lower case 3 by the dustproof sheet 9, there is a possibility that the central fixed contact 4 and the click spring 6 are obstructed by the dust and contact failure occurs. High reliability of the contact part can be maintained.

[0005]

[Problems to be solved by the device]

 However, in the above-described conventional push button switch, since the annular end portion 7a of the coil spring 7 pushes the periphery of the top portion of the click spring 6, the coil spring 7 in the inverted portion of the click spring 6 is The inversion amount of the pushed-in portion is not so large that there is a problem that it is difficult to obtain a clear click feeling. Also, due to the cushioning action of the dust-proof sheet 9 that closes the upper opening 3a of the lower case 3, there is a click. There was a problem that the click feeling generated by the spring 6 was weakened and transmitted to the coil spring 7. That is, it is difficult for the conventional push button switch described above to transmit a clear click feeling to the operator's finger pushing the stem 8 due to its structure, and the click feeling transmitted to the finger is unclear. As the reversing operation (contact switching operation) of the click spring 6, which is a movable contact, cannot be clearly sensed during the pushing operation, a good operation feeling could not be expected.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a push button switch which can sense the reversing operation of the click spring clearly and has a good operation feeling at low cost.

[0007]

[Means for Solving the Problems]

 As a first means for achieving the above object, the present invention provides a coil of the coil spring at an end portion of the coil spring, which is interposed between an operating member such as a stem and the click spring, on the click spring side. A pressing protrusion is provided which extends toward the center in the radial direction and elastically biases the top of the click spring.

As a second means for achieving the above object, the present invention provides a dustproof member for closing the opening of the case facing the fixed contact and the click spring, and a cylinder of the case. A push button switch provided with an operating member such as a stem having a sliding portion slidably contacting the cylindrical portion, and a coil spring interposed between the operating member and the above-mentioned click spring and located inside the tubular portion. In the above, as the dustproof member, a plate-shaped member provided with a notch for inserting the coil spring is used, and the coil spring is elastically contacted with the click spring.

[0009]

[Action]

 According to the first means, the pressing protrusion of the coil spring can perform the reversing operation by pressing the top of the click spring, and the part of the reversing portion of the click spring that is pressed into the coil spring. Since the reversal amount at the top is the largest, a clear click feeling can be transmitted to the operator's fingers.

On the other hand, according to the second means, the coil spring inserted into the notch of the plate-shaped dustproof member makes elastic contact with the click spring without interposing another member, so that the click feeling caused by the click spring is generated. Is directly transmitted to the coil spring, and the dust-proof property of the notch can be secured by the sliding portion of the operating member that is in sliding contact with the tubular portion of the case or the tubular portion, so that the contact point Invasion of dust into the parts can be avoided.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. Here, FIG. 1 is a cross-sectional view of a push button switch as an embodiment, FIG. 2 is an enlarged view of a main part of the embodiment, and FIG. 3 is a bottom view of a coil spring used in the embodiment. Portions corresponding to those in FIG. 4 used are denoted by the same reference numerals, and redundant description will be omitted as appropriate.

In the push button switch shown in FIGS. 1 to 3, a pressing protrusion 7 b is provided on the lower end of the coil spring 7 and the pressing protrusion 7 b is elastically contacted with the top of the click spring 6 and the contact portion. The point that the dustproof plate 10 made of a highly rigid plate-like member such as a metal plate is used as a dustproof member for protecting it from dust and the notch 10a is provided in the central portion of the dustproof plate 10 is largely different from the conventional example. Is different.

That is, this push-button switch has a coil radial direction center of the coil spring 7 at the lower end of the coil spring 7 provided between the sliding shaft portion 8 a of the stem 8 and the top of the click spring 6. And a coil spring 7 housed in the cylindrical portion 2a of the upper case 2 is provided between the upper case 2 and the lower case 3. It is inserted in the notch 10a of the dustproof plate 10 and is configured so that the pressing projection 7b directly elastically biases the top of the click spring 6.

Therefore, when the operator pushes the stem 8 downward against the elastic force of the coil spring 7 from the non-operated state shown in FIG. 1, the pressing protrusion 7 b of the coil spring 7 causes the top portion of the click spring 6 to move. When the coil spring 7 is compressed by a predetermined amount, the central portion of the click spring 6 produces a click feeling and is inverted, and the inverted portion comes into contact with the central fixed contact 4. A switch-on state is realized in which the central and peripheral fixed contacts 4 and 5 are electrically connected via. At this time, of the reversing parts of the click spring 6, the reversal amount of the part (top) pushed into the pressing protrusion 7b of the coil spring 7 has the largest reversal amount, so a clear click feeling can be obtained, and the inside of the cutout 10a of the dustproof plate 10 can be obtained. Since the coil spring 7 inserted in is elastically contacted with the click rod 6 without passing through any other member, the click feeling is directly transmitted, so that the operator's fingers have a clear click feeling. Reportedly.

Further, in this push button switch, although the notch 10a is opened in the dustproof plate 10, the dustproof property of the notch 10a is that the stem 8 slidingly contacting the inner wall surface of the tubular portion 2a of the upper case 2 slides. Since it is secured by the shaft portion 8a and the tubular portion 2a itself, that is, it is possible to cover the upper opening 3a of the lower case 3 with the dustproof plate 10, the tubular portion 2a and the sliding shaft portion 8a. Therefore, there is no possibility that external dust may enter the lower case 3 in which the fixed contacts 4 and 5 and the click spring 6 are arranged, and the reliability of the contact portion can be maintained.

The configuration and operation of the parts of the present embodiment not particularly described are the same as those of the conventional example.

As described above, in the above-described embodiment, the pressing protrusion 7b of the coil spring 7 is elastically brought into contact with the top of the click spring 6 while ensuring the dustproof property of the contact portion, so that it is clear to the operator's finger. The click feeling can be transmitted, the operation feeling is improved, and the high reliability of the contact part is maintained. Moreover, in the above-mentioned embodiment, there is no need to increase the number of parts as compared with the conventional example, so there is no concern about cost increase, and it is possible to manufacture at low cost with a small number of parts.

In addition, when the pressing protrusion of the coil spring is configured to elastically bias the top of the click spring through the dustproof sheet used in the conventional example, or the coil spring used in the conventional example is notched in the dustproof plate. Even if the annular end of the coil spring is elastically contacted with the circumference of the top of the click spring by inserting the coil spring in the inside, the touch feeling can be improved, though not so much as in the above embodiment.

[0019]

[Effect of device]

 As described above, the push-button switch according to the present invention is provided with the pressing protrusion for elastically urging the top of the click spring at the end of the coil spring, or the plate member having the notch as the dustproof member. Since the coil spring is elastically contacted with the click spring by using the coil spring, a clear click feeling can be transmitted to the operator's fingers without increasing the number of parts. A remarkable effect is that a push button switch that can be sensed and has a good operation feeling can be provided at low cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a push button switch according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the embodiment.

FIG. 3 is a bottom view of the coil spring used in the example.

FIG. 4 is a cross-sectional view of a push button switch according to a conventional example.

[Explanation of symbols]

 1 Case 2 Upper Case 2a Cylindrical Part 3 Lower Case 3a Upper Opening 4 Central Fixed Contact 5 Peripheral Fixed Contact 6 Click Spring 7 Coil Spring 7b Pressing Protrusion 8 Stem 8a Sliding Shaft 10 Dustproof Plate 10a Notch

Claims (3)

[Scope of utility model registration request] 1. A case in which fixed contacts are provided on an inner bottom surface,
A bowl-shaped click spring housed in the case and facing the fixed contact so as to be contactable and separable, a dust-proof member for closing the opening of the case facing the fixed contact and the click spring, and the case And a coil spring interposed between the operating member and the click spring, and the operating member is pushed to compress the coil spring by a predetermined amount. In a push-button switch that inverts a central portion of a spring to contact the fixed contact, an end portion of the coil spring on the click spring side extends toward a center portion of the coil spring in a coil radial direction, and a top portion of the click spring. A push button switch characterized in that it is provided with a pressing protrusion that elastically biases the. 2. A case in which a cylindrical portion is erected inside the outer wall and fixed contacts are provided on the inner bottom surface, and a bowl-shaped case which is housed in the case and faces the fixed contacts so that the fixed contacts can come in contact with and separate from the fixed contacts. It has a click spring, a dustproof member for closing the opening of the case facing the fixed contact and the click spring, and a sliding portion that is in sliding contact with the tubular portion of the case, and is movable up and down in the case. A holding operation member and a coil spring disposed between the operation member and the click spring and located inside the tubular portion are provided, and the operation member is pushed to compress the coil spring by a predetermined amount. In the push-button switch that inverts the central portion of the click spring to bring it into contact with the fixed contact, a plate-shaped member provided with a notch for inserting the coil spring is used as the dust-proof member. A push button switch characterized in that the above is elastically contacted with the click spring. 3. The case according to claim 2, wherein the case is formed by combining a lower case in which the fixed contact is provided and accommodates the click spring, and an upper case having the tubular portion. A push button switch characterized in that the plate member is interposed between a lower case and an upper case.