JPH0226111Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a push button switch that opens and closes a reed switch using a cam rotatably supported around one fulcrum.

Conventionally, this type of push button switch generally moves 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 cool.

Furthermore, when the magnet is moved relative to the reed switch in parallel or perpendicular to it, as is clear from FIG. It has the disadvantage that reliable operation cannot be obtained unless it 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. . In order to solve this drawback, it is necessary to increase the stroke of the magnet 51, but if the stroke of the push button is increased,
When a pushbutton switch is mounted on a panel, the pushbutton protrudes greatly from the panel, resulting in poor operability and poor balance with other switches.

Additionally, reed switches are relatively weak against inductive loads and are particularly prone to contact welding due to surge currents.Therefore, to protect the reed switch from surge currents, a resistor should be connected in series with the reed switch. This protects the contacts.

However, there are cases where it is not desirable to connect a resistor to a current circuit including a reed switch.
Therefore, it is desirable to be able to use a surge killer as needed.

This invention is intended to eliminate such conventional drawbacks, and one 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 FIG. 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 juxtaposed state. A retainer 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 a resistor 16 to be described later are formed on one side of the retainer. They are formed in parallel along the direction intersecting the axis of the holder 5, that is, along the longitudinal direction of the base 12. Further, each base 12 has first and second terminals 21, 2 as shown in FIG.
2 maintain a predetermined distance from each other in the longitudinal direction, and are formed integrally with the base 12 by penetrating the base 12 in its axial direction, and these terminals are connected to each terminal 24 of the reed switch 14 at one end of each terminal. , 24. Also reed switch 1
4 and the resistor 16 are connected in series with each other as shown in FIG.
is connected. That is, the first terminal 21 and the third terminal
By using the terminal 23 of the reed switch 14 and the resistor 16, the reed switch 14 and the resistor 16 are connected in series.
By utilizing the terminal 21 and the second terminal 22, the resistor 16 is substantially short-circuited.

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.

Further, the cam 32 located in the middle of the holder 5 in the axial direction has a fixed piece 33 at one end, and this fixed piece extends to the other end on both sides of the cam 32 and has a rotating edge at approximately the center thereof. 34 is formed. 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.

The magnet 51 is housed in the holding piece 47 and engages the engaging holes 48, 48 of the holding piece with the engaging protrusions 46, 46 of the cam 32, so that the rotating edge 34 of the cam 32 is moved. That is, it is held at a position deviated from the fulcrum P by a predetermined distance.

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 end face of the magnet 51, and the Y axis indicates the distance from the glass tube of the reed switch 14 to the magnet 51. From this figure, it can be seen that when the magnet 51 is installed 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. Further, FIG. 11 shows the relationship between the reed switch 14 and the magnet 51 shown in FIGS. 8 and 9, that is, the relationship between the reed switch 1
4 shows the relationship between the operating area and the open area. From this figure, it can be seen that by installing 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 open 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 opening and operating regions shown in the figure, the stability of the operation and opening of the reed switch 14 will deteriorate.

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. 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 rotation center or fulcrum of the cam 32 is B, the distance between A and B is L, the fulcrum of the spring 41 is C, and ∠CAB is α, then at point A there is a force F in the direction perpendicular to acts, and this force F becomes F=δKsinα・L/AC.

On the other hand, in FIG. 13, a force F' similarly acts, and this force F' becomes F'=δKsinβ·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 on the push button 2 exhibits the characteristics shown in FIG. 14, and touch field back 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 bottom 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 place and return to the position shown by the chain line in FIG. At the same time, the direction of inclination of the cam 32 is instantaneously switched to the state shown in FIG. 3, and one end of the cam 32, ie, the magnet 51, enters between the reed 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, this invention has a plunger 8 movably mounted on one end of the switch holder 5, and a reed switch 14 arranged on the other end of the holder in the axial direction of the switch holder 5.
and on the axis of the holder 5.
, a ridge 37 facing the other end of the plunger 8, and a pair of troughs 3 provided on both sides of the ridge.
8 and 39 are provided, one end of a coil spring 41 is engaged with one end of the cam, and the other end of this spring is engaged with the holder 5 on the other end side of the cam 32, Furthermore, a magnet 51 is fixed to the cam 32 at a position offset by a predetermined distance from the fulcrum of the cam, and a resistor 16 for blocking surge current is connected in series to the reed switch 14. Since the terminal section 22 for selectively shorting the resistor 16 is provided at the connection point with the push button switch, it is possible to easily configure a surge killer circuit as required. This has the advantage that the work is extremely easy.

[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 part below the switch holder in Fig. 1, Fig. 3 is a front sectional view showing the operating state, Figure 4 is a front sectional view for explaining 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, Figures 7 and 9 are side views, and Figures 10 and 9 are side views.
Figures 12 and 11 are characteristic diagrams showing the operation of the reed switch and magnet and the open area, Figures 12 and 13 are front views explaining the relationship between the cam and the coil spring, and Figure 14 is the operation of the push button. A characteristic diagram showing the relationship between force and its stroke, and FIG. 15 is a connection circuit diagram between a reed switch and a resistor. 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, 31...Connection, 32...Cam, 33...
... Fixed piece, 34 ... Rotating edge, 35 ... Notch, 36 ... Engagement hole, 37 ... Peak, 38 ... Valley, 39 ... Valley, 41 ... Coil spring,
42... Notch portion, 43... Support member, 47...
Holding piece, 48... engaging hole, 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 reed switch 14 is provided at the other end of the holder in the axial direction of the switch holder 5.
A rotation fulcrum for a cam 32, which has 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 located in the middle of the holder on the axis of the cam 32. Further, one end of a coil spring 41 is engaged with one end of this cam, and the other end of this spring is engaged with the holder 5 on the other end side of the cam 32, and the cam 32 has a fulcrum of the cam. A magnet 51 is fixed at a position offset by a predetermined distance from 16 is provided, and the cam 32 converts the linear reciprocating motion of the plunger 8 into the rotational motion of the magnet 51, and expands the amount of movement of the plunger 8. The reed switch 14 is maintained in a stable operating region in the first tilting state, and is separated from the reed switch 14 at a predetermined angle in the second tilting state of the cam 32. A push button switch that applies a sudden change in magnetic flux to the reed switch and deenergizes the reed switch.