JPH04499Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a push button switch that drives a reed switch by operating a push button.

Conventional push button switches of this type generally move a magnet parallel or perpendicular to a reed switch. Of course, it has become common to rotate the magnet and the reed switch relative to each other as a method of driving the reed switch, but it is extremely difficult to apply this to this type of push button switch because the mechanism becomes complicated. It was.

Furthermore, when the magnet is moved relative to the reed switch in parallel or perpendicular to it, as is clear from FIG. There is a drawback that reliable operation cannot be obtained unless the reed switch 14 is set accurately, and in particular, there are large variations in the offset position of the reed switch 14 and the size of the glass tube, which also causes the inability to obtain reliable operation. Ta. In order to solve this drawback, it is necessary to increase the stroke of the magnet 51, that is, the stroke of the push button. However, if the stroke of the push button is increased, when the push button switch is mounted on a panel, the push button will It had the disadvantage of being difficult to maintain operability and balance with other switches.

In view of these conventional drawbacks, this invention aims to reduce the stroke of the push button, operate the reed switch stably, and downsize the reed switch.

An embodiment of this invention will be described below with reference to the drawings.

That is, in FIG. 1, a push button 2 made of a translucent material is slidably protruded from one end of a housing 1, and a light emitting mechanism such as a light emitting diode or a lamp (as shown in the figure) is provided inside the housing 1. (not shown) are accommodated. A connector 4 is provided at the other end of the housing 1 via a bushing 3,
The switch holder 5, which has a U-shaped cross section, is connected to the housing 1 by this connector. Second
As shown in FIGS. 5 to 5, a guide case 6 is fixed inside one end of the holder 5,
A slider 7 is slidably accommodated in this guide case, and a holder 5 is held by the guide case 6.
guided to move in the axial direction. A tongue-shaped plunger 8 with a V-shaped tip is housed in the guide case 6, and this plunger is always held in the holder 5 by a coil spring 11 provided between the plunger and the bottom surface of the guide case 6. Therefore, the plunger 8 is pressed against the slider 7. When the push button 2 is pressed, the slider 7 is moved via a push rod (not shown) connected to the push button 2, and the plunger 8 is moved along the axis of the holder 5. ing.

A pair of bases 12, 12 are attached to the other end of the holder 5.
are fixed by rivets 13, 13 in a state where they are attached together. A holder 15 for holding the reed switch 14 is integrally formed on one surface of the base, and recesses 17 and 18 for receiving the reed switch 14 and the resistor 16 are formed on one side of the holder. The direction that intersects the axis of
That is, they are formed in parallel along the longitudinal direction of the base 12. In addition, as shown in FIG. 5, each base 12 has first and second terminals 21 and 22 that maintain a predetermined distance from each other in the longitudinal direction and pass through the base 12 in its axial direction. The terminals 24 and 24 of the reed switch 14 are integrally molded with each other at one end of each terminal.
24.

Note that it is desirable that the first and second terminals 21 and 22 be provided symmetrically with respect to the axis of the base 12, that is, the holder 5.

The reed switch 14 has a normally open, single-pole, single-throw contact structure, as shown in FIGS. 3 and 4.

Further, the pair of bases 12, 12 are attached to the holder 5 with the recesses 17, 18 of the respective retainers 15 facing each other. Then, with the reed switch 14 and the resistor 16 disposed in the recesses 17 and 18 of both the retainers 15 and 15, the reed switch 14 and the resistor 16 are
A predetermined interval is formed between them. In addition, a cam 32 located at an intermediate portion in the axial direction of the holder 5
has a fixed piece 33 at one end thereof, which extends to the other end on both sides of the cam 32 and forms a pivoting edge 34 approximately at its center. Furthermore, a pair of notches 35, 35 are provided at one end of the fixing piece 33.

On the other hand, the holder 5 is provided with a pair of fan-shaped engagement holes 36, 36 in its side wall, and when the rotating edges 34, 34 of the fixed piece 33 engage with the engagement holes, the cam 32 is moved relative to the holder 5. Pivotally supported. At this time, the pivot point P of the cam 32 is provided approximately on the axis of the holder 5.

Also, in the center of the cam 32, the plunger 8
A peak 37 having one apex is formed at the other end, that is, the part facing the tip, and V-shaped valleys 38 and 39 are formed on both sides of this peak, that is, on both sides of the fulcrum P, respectively. .

A pair of coil springs 41, 41 are connected to the cam 32
are arranged along the longitudinal direction on the sides of the cam 32, one end of each is engaged with one end of the cam 32, that is, the notches 35, 35 of the fixed piece 33, and the other end of each is engaged with the other end of the cam 32. It is hung on a rod-shaped support member 43 provided between opposing walls of the holder 5. Note that this support member engages with a notch 42 provided in the holder 5. The magnet 51 is housed in the holding piece 47 and is inserted into the engagement hole 4 of this holding piece.
8 and 48 and the engagement convex portions 46 and 46 of the cam 32, the cam 32 is held at a position offset by a predetermined distance from the pivoting edge 34, that is, the fulcrum P. Moreover, the axis of this magnet substantially coincides with the axis of the reed switch 14 when the cam 32 is in the first rotating state, and is aligned with the axis of the reed switch 14 in a predetermined position when the cam 32 is in the second tilting state. They are arranged so as to intersect at an angle of , and to be spaced apart from the reed switch 14 .

6 and 7 show a state in which the axis of the reed switch 14 and the magnetization direction of the magnet 51 are parallel. Also, Figure 10 is similar to Figures 6 and 7.
This figure shows the relationship between the reed switch 14 and the magnet 51, that is, the relationship between the operating area and the open area of the reed switch 14. In this figure, the X axis is when the offset position of the reed piece of the reed switch 14 is set as the origin. The Y axis indicates the distance from the center of the magnet 51, and the Y axis indicates the distance from the glass tube of the reed switch 14 to the magnet 51. It can be seen from this figure that when the magnet 51 is placed at the offset position of the reed switch 14, the reed switch 14 is in a stable operating region.

On the other hand, FIGS. 8 and 9 show the reed switch 14.
This shows a state in which the axis of the magnet 51 and the magnetization direction of the magnet 51 intersect with each other. Also, Figure 11 shows the 8th
The relationship between the reed switch 14 and the magnet 51 shown in FIG.
This shows the relationship between the operating area and the open area. From this figure, it can be seen that by arranging the magnet 51 at an offset position of the reed switch 14, that is, to the left, the reed switch 14 is in a stable region.

Therefore, reed switch 14 and magnet 5
The relative position to 1 is set to 1 when operating, that is, when on.
If the reed switch 14 is placed in the state shown in FIG. 0 and in the state shown in FIG. It can be seen that if the reed switch 14 is placed near the open area shown in the figure or between the operating areas, the operation and opening stability of the reed switch 14 will deteriorate.

Further, FIG. 12 is a diagram corresponding to FIG. 3, that is, FIG. 6, and FIG. 13 is a diagram corresponding to FIG. 4, that is, FIG. 8, respectively. It shows.

Therefore, in Fig. 12, the elongation of the spring 41 is δ, the spring constant is K, and the spring 41 and the cam 3 are
2 is the fulcrum with A, the center of rotation of the cam 32, that is, the fulcrum is P, the distance between A and P is L, the fulcrum of the spring 41 is C, and ∠CAP is α, then at point A there is a value in the direction perpendicular to , F acts, and this force F becomes F=δKsin α・L/AC.

On the other hand, in FIG. 13, a force F' similarly acts, and this force F' becomes F'=δKsin β·L/AC. Therefore, these forces F, F′ are δ, α,
It changes depending on β. When the cam 32 is operated by the plunger 8, the relationship between the force and the stroke at the push button 2 exhibits the characteristics shown in FIG. 14, and touch feedback can be felt at points D and E. .

Next, the operation of this push button switch will be explained.

That is, in the state shown in FIG.
tilts to the right around the fulcrum P, and reed switch 1
4 is in the open state. When the push button 2 is pressed in this state, the tip of the plunger 8 is moved to the cam 32.
The peaks 37 of the ridges 37 collide with the slopes of one of the troughs 38,
Subsequently, it slides down along this slope toward the trough of the trough 38. When the plunger 8 reaches the bottom of the trough 38, the cam 32 is pressed and rotated counterclockwise about the fulcrum P.

As a result, one end of the coil spring 41, which was in the position shown in FIG. 4, is gradually stretched and moved downward using the support member 43 as a fulcrum.
When the center line of the spring 41 crosses the fulcrum P, the springs 41, 41 snap into action, and at the same time, the direction of inclination of the cam 32 is instantaneously switched as shown in FIG. It enters between the switches 14, 14, thereby closing the reed switches 14, 14. Note that even if the pressing force applied to the push button 2 at this time is released, the cam 32 is maintained in its tilted state due to the tensile force of the springs 41, 41.

Further, when the push button 2 is pressed again in the above-mentioned state, the plunger 8 that moves together with the plunger 8 descends and engages with the other trough 39 of the cam 32, pressing the cam 32. That is, the magnet 51 is snapped in the direction away from the reed switch 14, and is returned to the state shown in FIG. 4. Accordingly, the snapping action of the cam 32 causes the contacts 19, 20 of the reed switches 14, 14 to separate, and this state is maintained even when the push button 2 is released.

That is, when the push button 2 is pressed only once, the reed switch 14 is turned on, and when the push button 2 is pressed the next time, the reed switch 14 is turned off.

As mentioned above, the reed switch 14 is disposed at the other end of the switch holder 5 in the axial direction, and the reed switch 14 is disposed approximately on the axis of the holder 5 in the middle of the holder by means of the plunger 8. A rotation fulcrum is provided for the driven cam 32, and a coil spring 4 is provided at one end of the cam.
At the same time, the other end of this spring is engaged with the holder 5 at the other end of the cam 32, and the magnet 51 is connected to the cam 32.
The axis of the magnet 51 is approximately aligned with the axis of the reed switch 14 at a position offset from the fulcrum of the reed switch 14 by a predetermined distance from the fulcrum of the cam 32 in the first tilting state of the cam 32, and the axial center of the magnet 51 is approximately aligned with the axis of the reed switch 14, and the cam 32 is in the second tilting state. The plunger 8 intersects the axis of the reed switch 14 at a predetermined angle and is spaced apart from the reed switch. In addition, the amount of movement of the plunger 8 is substantially expanded, and the direction of the magnetic flux is rapidly changed with respect to the reed switch 14 to drive the reed switch. 5
1, the reed switch 14 can be placed in a stable operating region and open region,
Therefore, the unstable area of the reed switch is reduced, and at the same time touch feedback can be obtained when the push button 2 is operated. These bases are each provided with a retainer 15, and each retainer is provided with recesses 17 facing each other, and the reed switch is held in this recess.
1 can be located between the reed switches 14, 14, and therefore there is an advantage that one magnet can drive the two reed switches at the same time.

[Brief explanation of the drawing]

Fig. 1 is an external perspective view of the push button switch in this invention, Fig. 2 is a side sectional view showing the switch holder part in Fig. 1, Fig. 3 is a front sectional view showing the operating state, and Fig. 4 is the open state. Figure 5 is an exploded perspective view, Figures 6 to 9 show the relative relationship between the reed switch and the magnet, Figures 6 and 8 are front views, and Figures 7 and 9 are front views. 9 is a side view, FIGS. 10 and 11 are characteristic diagrams showing the relative relationship between the reed switch and the magnet, FIGS. 12 and 13 are front views illustrating the relationship between the cam and the coil spring, and FIG. The figure is a characteristic diagram showing the relationship between the operating force of the pushbutton and its stroke. 1... Housing, 2... Push button, 3... Butching, 4... Connector, 5... Switch holder, 6... Guide case, 7... Slider, 8...
Plunger, 11...Coil spring, 12
... Base, 13 ... Rivet, 14 ... Reed switch, 15 ... Retainer, 16 ... Resistor, 17
... recess, 18 ... recess, 19 ... contact, 20 ...
...Contact, 21...First terminal, 22...Second terminal, 23...Third terminal, 24...Terminal, 32...
...Cam, 33... Fixed piece, 34... Rotating edge,
35...notch, 36...engaging hole, 37...peak, 38...trough, 39...trough, 41...coil spring, 42...notch, 43...support member , 46... Engaging convex portion, 51... Magnet.

Claims (1)

[Scope of utility model registration request] A plunger 8 is provided at one end of the switch holder 5 so as to be movable up and down, and a pair of bases 12, 12 are attached to the other end of the holder in the axial direction of the switch holder 5, and each of these bases holds a reed switch 14. Retainer 1
5 respectively, and the reed switch 1
A cam 32 having a peak 37 facing the other end of the plunger 8 and a pair of troughs 38 and 39 provided on both sides of the peak is provided between 4 and 14,
The pivot point of this cam is provided in the middle part of the holder 5, and one end of the coil spring 41 is engaged with one end of the cam, and the other end of the spring is connected to the other end of the cam 32 of the holder 5. In addition, the magnet 51 is placed in the cam 32 at a position offset by a predetermined distance from the rotational fulcrum of the cam 32, and the axis of the magnet 51 is positioned in the position where the cam 32 is in the first tilting state. The cam 32 is substantially aligned with the axis of the reed switch 14, intersects with the axis of the reed switch 14 at a predetermined angle in the second tilting state of the cam 32, and is located on one side of the retainer 15. a recess 1 that supports the reed switch 14;
7, and the bases 12, 12 are arranged in a direction intersecting the axis of the holder 5 so that their respective recesses 17 face each other.