JPH0544978Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application This invention relates to a push button switch used for controlling the energization of various electronic devices such as audio equipment.

(b) Conventional technology Conventionally, this type of push button switch was
For example, a device equipped with an alternate mechanism as described in Japanese Utility Model Application Publication No. 59-109031 is known.

However, in such a conventional structure, the plunger sliding surface and the guide of the alternate mechanism are separate bodies, and since dimensional accuracy is generally required for the alternate mechanism, the plunger sliding surface and the guide are separated in this way. If they are separate parts, there is a problem that smooth cam movement cannot be achieved due to manufacturing and assembly errors.
Furthermore, since the guide part of the alternate mechanism itself is formed on the inner surface of the case, it is difficult to form the mechanism.Furthermore, since the plunger sliding surface and the guide of the alternate mechanism are separate bodies, the structure becomes large. There was a problem that a compact structure could not be obtained.

(c) Problem to be solved by the invention The object of this invention is to provide a push button switch which can obtain smooth movement of the alternate cam, is easy to manufacture, and can be constructed in a small and compact size.

(d) Means for Solving the Problems This invention forms a groove-shaped sliding part in the vertical direction on the side surface of the switch base that faces the inner surface of the housing, which guides the sliding surface of the plunger in the vertical direction. An alternate cam of the alternate mechanism is pivotally connected to a plunger that moves up and down guided by the groove-shaped sliding portion, and a predetermined operating point in contact with the alternate cam to perform a tilting lock/rotation lock release operation is provided. The push button switch is a push button switch in which three guides are integrally formed so as to protrude inwardly from the groove side surface and bottom surface at a position outside the thickness of the plunger within the recessed groove-shaped sliding portion. It is characterized by

(e) Effects of the invention According to this invention, three guides for locking and releasing the tilting lock of the alternate cam are integrally formed in the groove-shaped sliding portion that guides the sliding surface of the plunger. Therefore, the above-mentioned sliding part serves both as a guide for the plunger and as a guide groove for the alternate cam, resulting in a small and compact structure.Moreover, because of the above-mentioned integral structure, the positioning accuracy of the guide relative to the sliding part is high. As a result, high dimensional accuracy can be obtained, which has the effect of making it possible to obtain smooth and reliable movement of the alternate cam.

Furthermore, the three guides of the alternate mechanism and the sliding part of the plunger can be formed on the side surface of the switch base, that is, on the outside, compared to the prior art described above, in which cam grooves are formed on the inner surface of the case. This makes it easier to form the mold, and
By partially arranging three guides on the sliding part, material sinkage is less likely to occur during resin molding.
Dimensional accuracy is increased, and even smoother and more reliable alternate cam operation can be obtained.

(F) Embodiment of the invention An embodiment of the invention will be described below in detail based on the drawings.

The drawings show a push button switch, and in Figures 1 and 2, 1 is a housing made of synthetic resin;
This housing 1 has a lower cylindrical portion 2 and an upper rectangular cylindrical portion 3 integrally formed.

Reference numeral 4 denotes a lamp case made of synthetic resin. An LED 6 held in a holder 5 is attached to the lower part of the case 4, and a cover 8 is fitted to the upper part with a light diffusing plate 7 interposed therebetween.

A lighting unit 9 in which the above-mentioned elements 4 to 8 are integrated is slidably attached to the upper end opening of the above-mentioned housing 1.

On the other hand, in the cylindrical portion 2 of the housing 1 described above, there is provided a first switch base 1 in which a terminal 10 is integrated.
1 and a second switch base 12 with integrated terminals 13 are attached.

One first switch base 11 is integrally formed with a recessed groove-shaped sliding part 14 located approximately at the center of the aforementioned cylindrical part 2, and this recessed groove-shaped sliding part 14 will be described later. In addition to guiding the vertical movement of the plunger 21, the sliding portion 14 defines a switch mechanism 26. Further, a through hole 15 is formed on this sliding portion 14 for leading out an operating piece 24, which will be described later, to the plunger 21 side, and a bar-like structure is formed next to this through hole 15 to lock the aforementioned operating piece 24. The locking portion 16 is integrally formed of synthetic resin.

The sliding portion 14 described above divides the inside of the cylindrical portion 2 of the housing 1 into two into a plunger chamber 17 and a switch mechanism chamber 18, and one plunger chamber 17 has a
A plunger 21 with an alternate cam 20 pivotally attached to the protruding shaft 19 is disposed, and the other switch mechanism chamber 18
includes a movable piece 23 having a contact 22 at its free end;
A switch mechanism 26 consisting of a substantially W-shaped operating piece 24 and a tension spring 25 is provided.

One end 24a of the aforementioned substantially W-shaped operating piece 24 is locked to the inverted L-shaped terminal 13, and its middle portion is led out into the plunger chamber 17 through the aforementioned through hole 15, and this leading end is used for operation. The other end 24b of the piece 24
A coil spring 27 is stretched between the spring seat 21a and the above-mentioned spring seat 21a on the upper part of the plunger 21.

Furthermore, the above-mentioned locking angle 2 of the upper end of the plunger 21 is
8 is engaged with the protruding shaft 29 at the bottom of the lamp case 4, and the plunger 21 is
are configured to work together.

Next, the specific structure of the alternate mechanism 30 will be explained based on FIGS. 1 and 3.

This alternate mechanism 30 regulates the pressed position and the pressed release position of the plunger 21 described above.
A total of three guides 3 are formed integrally with the above-mentioned alternate cam 20 and are arranged at predetermined operating points in contact with the above-mentioned alternate cam 20 to perform the tilting lock/rotation lock release operation.
1, 32, and 33.

Furthermore, the aforementioned sliding portion 14 is a sliding surface 1 that guides the bottom surface (the right side surface in FIG. 1) of the plunger 21.
4a, and mutually parallel side edges 1 that guide both sides of the plunger 21 and rise from the sliding surface 14a.
4b and 14b.

The aforementioned three guides 31, 32, and 33 are arranged in the sliding portion 14 at a position apart from the outside (inner surface side of the housing 1) by the thickness of the aforementioned plunger 21, so that the aforementioned plunger 21 is placed on the sliding portion 14. The guides 31, 32, 33 are arranged so as to act on the alternate cam 20 without interfering with the plunger 21 when sliding up and down inside the plunger 21.

A first guide 31 having an arc-shaped corner is provided on the right side of the lower part of the sliding part 14, and the first guide 31 is provided on the left side of the lower part of the sliding part 14 at a predetermined distance from the first guide 31. An angular second guide 32 is provided at a slightly lower portion than the second guide 32, and furthermore, the second guide 32 is provided at a middle portion of the right side edge 14b facing the first guide 31,
and the thickness of the sliding portion 14a of the plunger 21 mentioned above.
An angular third guide 33 is provided at a position further away from the outside (inner surface side of the housing 1), and each of these guides 31, 32, 33 is configured to restrict rotation of the alternate cam 20.

Further, the above-mentioned alternate cam 20 has a rectangular shape, and the center portion of both short sides is connected to the above-mentioned guide 3.
1, 32, and 33, cam grooves 20a, 20a are formed by V-shaped notches, respectively.

In the figure, 34 and 35 are terminals for LEDs,
Reference numeral 6 denotes a mounting screw that is screwed into the threaded portion on the outer periphery of the cylindrical portion 2 described above.

The illustrated embodiment is configured as described above,
The action will be explained below.

Normally, the alternate cam 20 of the alternate mechanism 30 has side edges 14b, 14 as shown in FIG.
When the illumination unit 9 is pushed down, the plunger 21 moves downward in conjunction with the engagement between the protruding shaft 29 and the locking angle 28, and the lower part of the plunger 21 moves downward. Since the power is transmitted to the operating piece 24 via the coil spring 27, the operating piece 24 swings counterclockwise in FIG. Since the piece 23 is tilted and the contact 22 at its lower end presses against the opposing terminal 10, the switch is turned from off to on and the LED 6 emits light.

The alternate cam 20 moves downward in conjunction with the downward movement of the plunger 21, and as shown in FIG. 3, the cam 20 comes into contact with the first guide 31.
The cam 20 tilts, and the cam groove 20a engages with the second guide 32, thereby restricting the downward movement of the plunger 21.

Then, when the pressing force is released, the alternate cam 20 moves slightly upward together with the plunger 21, as shown in FIG. Correspondingly, the depressed state of plunger 21 is locked.

When the plunger 21 is pressed down again, as shown in FIG. 3F, the alternate cam 20 comes into contact with the second guide 32 due to the downward movement of the plunger 21, and the cam 20 is tilted. As shown in FIG.
0 is in a horizontal position, and the depression of the plunger 21 is restricted.

Then, when the pressing force is released, the plunger 21 returns upward as shown in FIG. As the state returns, the switch switches from on to off.
The state shown in FIG. 1 is reached.

The operation of the alternate cam 20 is achieved by integrally forming the guides 31, 32, and 33 on the sliding portion 14 of the plunger 21 to improve the dimensional accuracy.
The movement is smooth and reliable.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, with FIG. 1 being an exploded perspective view of a push button switch, FIG. 2 being a sectional view of the switch, and FIG. 3 being an explanatory view of the operation of the alternate mechanism. 11... Switch base, 30... Alternate mechanism, 14... Sliding part, 31, 32, 33...
Guide, 20...alternate cam, 21...plunger.

Claims (1)

[Claims for Utility Model Registration] A switch base equipped with a switch mechanism is attached to the lower part of a housing holding a push button in the upper part, a plunger is connected to the push button, an alternate mechanism is attached to the plunger, A push button switch that operates a switch mechanism by vertical movement of a plunger based on the operation of a push button, wherein a groove for guiding a sliding surface of the plunger in the vertical direction is provided on a side surface of the switch base that faces the inner surface of the housing. A shaped sliding part is formed in the vertical direction, and an alternate cam of the alternate mechanism is pivotally connected to the plunger that moves up and down guided by the groove-shaped sliding part, and a tilting lock/rotation lock is attached to the alternate cam. Three guides disposed at predetermined operation points in contact with each other to perform a release operation are provided to protrude inward from the groove side and bottom surfaces at positions within the groove-shaped sliding portion and further outward than the thickness of the plunger. A push button switch that is integrally formed.