JPH09161600A - Push switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts and improve assembly workability by providing a unlocking recess part and fitting in an unlock state a switch knob fitted to a pin at the lower side of a hear cam. SOLUTION: When a switch knob 3 is depressed in the switch on-state, a cam groove 5 falls, a pin 15 rises along the right side face of a triangular cam 19 and hits a recess part 22b on the right side of the cam 19, and the descent of the knob 3 is regulated. When the pressing of the knob 3 is released in this state, the cam groove 5 rises, the pin 15 falls along a guide wall face 24b and hits an unlocking recess part 21 via a bottom face parts 20b and 20c, and the rise of the knob 3 is restricted. The switch is turned off in this state, the knob 3 is fixed to an unlock state, and the same operation is repeated when the knob 3 is depressed in this time. A lock cap becomes unnecessary, and assembling is made possible by inserting the knob 3 from the upper side of a housing 1 and stopping a pin tip part 15b at the recess part 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a push switch that is turned on and off by pressing a switch knob.

[0002]

2. Description of the Related Art FIGS. 8 to 14 show an example of a conventional push switch. 8 to 10, the guide cylinder portion 2 of the housing 1 is provided with the left and right side wall portions 4 of the switch knob 3.
And the cam plate 6 is slidably inserted. A convex spring receiving portion 10 is formed in the guide cylinder portion 2, and a knob coil spring 11 is mounted between the outer circumference of the spring receiving portion 10 and the switch knob 3 (see FIGS. 9 and 10). ).

A box-shaped lock cap 30 is provided below the spring receiving portion 10. The left and right side wall portions 30a of the lock cap 30 are slidably inserted into the left and right side wall portions 4 of the switch knob 3, and the front and rear side wall portions 30b are slidable on the guide portion 31 that hangs downward from the spring receiving portion 10 of the housing 1. It is inserted freely. The protrusions 32 formed on the left and right side wall portions 30 a of the lock cap 30 are fitted into the long holes 33 formed in the left and right side wall portions 4 of the switch knob 3. A lock cap coil spring 34 is mounted between the lock cap 30 and the lower surface of the spring receiving portion 10.

The lock cap 30 is urged downward by the lock cap coil spring 34, and the switch knob 3 is urged upward by the knob coil spring 11. Both urging forces cause the protrusion 32 and the lower end of the long hole 33 to move. It is locked.

A wiring board 12 is provided under the housing 1, and a rubber contact 13 is provided on the wiring board 12. The rubber contact portion 1 of the rubber contact 13 is provided.
The lower surface of the lock cap 30 is in contact with 4.

The cam plate 6 of the switch knob 3 has a cam groove 5
Is formed, and the tip portion 15b of the pin 15 made of a torsion coil spring is engaged with the cam groove 5. This pin 15
The coil portion 15 a is supported by a mounting plate 17 mounted on the housing 1.

11 to 14, a heart cam 18 is provided at the center of the cam groove 5, and a triangular cam 19 is formed above the heart cam 18. A first bottom surface portion 20a that is the lowest from the lower left to the upper portion of the heart cam 18 is provided, a second bottom surface portion 20b that is an upwardly tapered surface is provided on the right side, and a second bottom surface portion 20b is provided at the lower end of the second bottom surface portion 20b. Third bottom surface portions 20c protruding further forward are formed respectively.
The lower edge 20d of the third bottom surface portion 20c is the first bottom surface portion 20a.
Is formed at a right angle to (see FIG. 13). The surface of the heart cam 18 is flush with the surface of the cam plate 6.

The tip portion 15b of the pin 15 (hereinafter referred to as the pin tip portion 15b) is urged toward the bottom surface of the cam groove 5 by the urging of the coil portion 15a and toward the right side of FIGS. 12 and 14. Has been done.

Switch knob 3 and knob coil spring 1
1 from above the housing 1, and lock cap 3
0 and the lock cap coil spring 34 are assembled from below the housing 1, and the protrusion 32 of the lock cap 30 is fitted into the elongated hole 33 of the switch knob 3. Switch knob 3
At the time of assembling, the pin tip 15b rises along the guide wall surface 24a on the right side of the cam groove 5 (the pin tip 15b rises,
The downward movement means a relative movement with respect to the cam plate 6, and the same applies hereinafter). In the initial state shown in FIGS. 9 and 10,
The pin tip portion 15 is on the reference position O in FIG. 14, and this position indicates the unlocked position of the switch.

In the initial state, the switch knob 3 is biased upward by the knob coil spring 11 as shown in FIGS. 9 and 10, but is locked downward by the lock cap coil spring 34. The upward movement of the switch knob 3 is restricted by being locked by the protrusion 32 of the switch 30, and the switch knob 3 is fixed in the unlocked state.

When the switch knob 3 is pushed in the initial state, the pin tip portion 15b rises from the lower edge 20d of the third bottom surface portion 20c along the left side surface of the heart cam 18 and reaches the recess 22a on the left side of the triangular cam 19 ( The first locus R1 in FIG. 14). This position is the lower limit of the switch knob 3. As the switch knob 3 is lowered, the lock cap 30 is also lowered by the bias of the lock cap coil spring 34, and the rubber contact portion 14 is moved.
Press to switch on.

When the pressing of the switch knob 3 is released, the switch knob 3 rises, and the pin tip portion 15b has a triangular cam 19.
When it descends along the left side surface (second locus R2) and hits the concave portion 23 of the heart cam 18, the rise of the switch knob 3 is restricted. This position is in the switch-locked state, the lock cap 30 is kept in the lowered state by the bias of the lock cap coil spring 34, and the switch-on state continues.

When the switch knob 3 is pushed in the switch-on state, the cam plate 6 descends, and the pin tip portion 15b ascends through the third locus R3 along the right side surface of the triangular cam 19 to the right side of the triangular cam 19. Hitting the recess 22b of the switch knob 3
Is regulated. When the pressing of the switch knob 3 is released in this state, the cam plate 6 ascends, the pin tip portion 15b descends along the guide wall surface 24b (fourth locus R4), and the switch-off and unlocked initial states (Fig. 9 and the state of FIG. 10). At this time, the pin tip portion 15b returns to the reference position 0.

When the switch knob 3 is pushed in this state, the pin tip portion 15b passes through the first locus R1 to the fourth locus R4 and performs the same operation.

[0015]

In the conventional push switch as described above, the lock cap 3 for fixing the switch knob 3 when the switch is in the unlocked state.
Since 0 is required, the configuration is complicated, the number of parts is increased, and the switch knob 3 is assembled from above the housing 1 and the lock cap 30 is assembled from below to the switch knob 3, which requires two steps. There is also a problem in work efficiency.

The present invention has been made by paying attention to the above-mentioned points, and enables a switch knob to be fixed without using a lock cap, thereby reducing the number of parts and improving the workability of assembly. The purpose is to provide.

[0017]

According to the first aspect of the present invention,
A switch knob that is slidably mounted on the housing and is urged in a switch-off direction by a coil spring for the knob, a cam groove provided on a cam plate of the switch knob, and a cam groove that is attached to the housing and is attached to the cam groove. In a push switch having a follow-up pin, which holds the switch knob in a locked state by locking the pin and a heart cam formed in the cam groove, the push switch is locked to the pin below the heart cam. It is characterized in that an unlocking recess for fixing the switch knob in an unlocked state is formed.

Therefore, according to the first aspect of the invention, when the switch knob in the locked state is pressed and then released, the pin is locked in the unlocking recess, the switch knob is prevented from rising, and the switch knob is It is fixed in the unlocked state. Therefore, a lock cap for unlocking is unnecessary, and the number of parts can be reduced.

According to a second aspect of the present invention, the push switch according to the first aspect is characterized in that the switch knob is formed with a pressing shaft for pressing a rubber contact portion to turn the switch on and off. Is.

Therefore, according to the second aspect of the invention, the switch is turned on / off directly by the pressing shaft of the switch knob.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on an embodiment shown in the drawings. The same members as those in FIGS. 8 to 14 are designated by the same reference numerals.

In FIGS. 1, 2 and 3, the left and right side wall portions 4 of the switch knob 3 are slidably inserted into the guide tube portion 2 of the housing 1, and the cam plate 6 having the cam groove 5 has the guide hole 7. In addition, the pressing shaft 8 is slidably inserted in each hole of the spring receiving portion 10. A knob coil spring 11 is mounted between the outer periphery of the spring receiving portion 10 and the switch knob 3.

A wiring board 12 is provided below the housing 1, and a rubber contact 13 is provided on the wiring board 12. The rubber contact portion 1 of the rubber contact 13 is provided.
The lower end of the pressing shaft 8 is in contact with 4.

The cam plate 6 of the switch knob 3 has a cam groove 5
Is formed, and the tip portion 15b (hereinafter referred to as the pin tip portion 15b) of the pin 15 made of a torsion coil spring is engaged with the cam groove 5. The coil portion 15a of the pin 15 is supported by a mounting plate 17 (FIGS. 1 and 3) mounted on the housing 1.

4 to 7, a heart cam 18 is provided at the center of the cam groove 5, and the triangular cam 1 is provided above the heart cam 18.
9 is formed, and an unlocking recess 21 is formed below the heart cam 18. From the lower left of the heart cam 18 and the unlocking recess 21 to the heart cam 18
The first bottom surface portion 20a which is the lowest toward the top of the second bottom surface portion 20b is formed on the right side of the heart cam 18, and the second bottom surface portion 20b is a tapered surface that rises forward, and the lower end of the second bottom surface portion 20b is located in front of the second bottom surface portion 20b. Third bottom surface portions 20c protruding inward are formed, and a lower edge 20d of the third bottom surface portion 20c is formed at a right angle to the first bottom surface portion 20a (see FIG. 6).
The surface of the heart cam 18 is flush with the surface of the cam plate 6 of the switch knob 3.

The pin tip portion 15b is directed toward the bottom surface of the cam groove 5 by the biasing force of the spring portion 15a, and as shown in FIGS.
Is urged to the right of.

Next, the operation of the push switch of the above-mentioned embodiment will be described together with the movement of the pin tip portion 15b of FIG. The ascent and descent of the pin tip portion 15b means a relative movement with respect to the cam plate 6.

When the switch knob 3 is assembled to the guide tube portion 2 of the housing 1 and pushed in against the switch knob coil spring 11, the pin tip portion 15b rises. First, the pin tip portion 15b rises along the guide wall surface 24a on the right side of the cam groove 5, rises along the left side surface of the heart cam 18 from the lower edge 20d of the third bottom surface portion 20c, and forms a recess on the left side of the triangular cam 19. 22a is reached (first locus R1 in FIG. 7). This position is the lower limit of the switch knob 3. As the switch knob 3 descends, the pressing shaft 8 also descends and presses the rubber contact portion 14, and the switch is turned on. At this time, the top portion 14a of the rubber contact portion 14 is pressed to a state where it is elastically deformed. For this reason, the top portion 14a is formed in a shape in which a concave portion is formed inside and is easily bent (see FIGS. 2 and 3).

When the pressing of the switch knob 3 is released, the switch knob 3 rises, the pin 15 descends along the left side surface of the triangular cam 19 (second locus R2), and when it hits the concave portion 23 of the heart cam 18, the switch knob 3 is released. Rise is regulated.
This position is the switch-locked state, and the elastic deformation of the top portion 14a of the rubber contact portion 14 is restored, but the wiring board 1
The switch-on state continues with the contact state of the contact No. 2 being maintained.

When the switch knob 3 is pushed in the switch-on state, the cam groove 5 descends, and the pin 15 ascends through the third locus R3 along the right side surface of the triangular cam 19 and the triangular cam 19
The lowering of the switch knob 3 is regulated by hitting the concave portion 22b on the right side of. When the pressing of the switch knob 3 is released in this state, the cam groove 5 rises and the pin 15 moves toward the guide wall surface 24b.
Down along the second and third bottom surface portions 20b and 20c.
After hitting the unlocking recess 21 through the switch knob 3
Is restricted (fourth locus R4). In this state, the switch is turned off and the switch knob 3 is fixed in the unlocked state. 2 and 3 show this unlocked state.

When the switch knob 3 is pushed in the unlocked state, the cam groove 5 descends and the pin tip portion 15b rises along the lower edge 20d of the third bottom surface portion 20c to reach the recess 22a. By a similar operation, it enters the concave portion 21 through the second, third, and fourth loci R2, R3, and R4, and becomes the unlocked state.

As described above, in the push switch according to the present embodiment, the unlock groove 21 is provided in the cam groove 5, and the pin tip portion 15b is locked in the unlock groove 21 to unlock the switch knob. Since 3 is fixed, the lock cap 30, which was indispensable in the past, is unnecessary, the number of parts can be reduced, and the switch knob 3 can be assembled simply by inserting it from above the housing 1. Since it is possible to assemble from one direction, workability is improved.

[0033]

As described above in detail, according to the invention described in claim 1, the lock cap is not required, the number of parts can be reduced, and the switch knob is simply inserted from above the housing. Assembling is possible, and since it is possible to assemble from one direction of the housing, workability is improved.

According to the second aspect of the invention, since the switch is directly turned on and off by the pressing shaft of the switch knob, in addition to the effect of the first aspect of the invention, the spring for pressing the switch becomes unnecessary. The number of parts can be reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a push switch according to the present invention.

FIG. 2 is a vertical sectional side view of the push switch of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 2;

4 (a), (b), (c) and (d) are perspective views in which the angle of the cam plate is changed.

5 is a front view of the cam plate of FIG. 4, in which the depth of the cam groove is indicated by different diagonal lines.

6 is a vertical cross-sectional side view of the cam plate of FIG.

FIG. 7 is an explanatory diagram showing the operation of the push switch of FIG. 1 by the relative movement of the cam groove and the pin.

FIG. 8 is an exploded perspective view of a conventional push switch.

9 is a vertical sectional side view of the push switch of FIG.

FIG. 10 is a sectional view taken along line XX of FIG. 9;

11 (a), (b), (c), and (d) are perspective views of the conventional cam plate viewed from different angles.

FIG. 12 is a front view of a conventional cam plate, in which the depth of the cam groove is shown by different hatching.

13 is a vertical sectional side view of the cam plate of FIG.

14 is an explanatory diagram showing the operation of the push switch of FIG. 8 by the relative movement of the cam groove and the pin.

[Explanation of symbols]

 1 Housing 3 Switch Knob 5 Cam Groove 6 Cam Plate 11 Knob Coil Spring 14 Rubber Contact Part 15b Pin Tip (Pin) 18 Heart Cam 21 Unlock Concave

Claims (2)

[Claims] 1. A switch knob mounted slidably on a housing and biased in a switch-off direction by a coil spring for a knob, a cam groove formed on a cam plate of the switch knob, and mounted on the housing. A push switch that holds the switch knob in a locked state by locking the pin and the heart cam formed in the cam groove. A push switch characterized by being formed with an unlocking recess that is locked to a pin and fixes the switch knob in an unlocked state. 2. The push switch according to claim 1, wherein the switch knob is formed with a pressing shaft for pressing a rubber contact portion to turn on / off the switch.