JPS5821051Y2 - push button switch - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a push button switch with a clear switching sensation.

Leaf spring contact type pushbutton switches used in computer terminals and electric typewriters have an inverted spring made of a bent beryllium copper thin plate, similar to those used in microswitches, arranged flat on the bottom plate. The reversing spring is reversed by vertically pressing the reversing spring with an actuating member to which a push button is attached, and the movable contact attached to the reversing spring is brought into contact with a fixed contact provided on the bottom plate to turn on the switch.

When the pushbutton is no longer pressed, the reversing spring automatically returns, pulling the movable contact away from the fixed contact and turning off the switch.

This type of switch uses a reversing spring made by bending a thin sheet of beryllium copper, so it has the advantage of providing light switching action and a clear switching sensation, but the reversing spring is placed flat on the bottom plate. Because of this, it was not only impossible to provide multiple switching circuits, but also it was not possible to incorporate an accessory mechanism internally.

The present invention is a novel invention to improve the above-mentioned conventional drawbacks, and its purpose is to provide a leaf spring contact type push button switch that is equipped with a plurality of switching circuits and has a clear switching operation.

For that purpose, the push button switch of the present invention has a fixed contact on one side of a first frame that is formed into a flat plate and has a hole in the center of the first frame that passes through a tactile lever that presses a movable contact. A fixed terminal and a movable terminal that conducts with the movable contact are attached, a reversing leaf spring having the movable contact is provided on the other surface of the iron frame, and the reversing leaf spring and the movable terminal are fitted, and The fixed contact and the movable contact are made to face each other, and the leg that fits the rubber spring catcher on which the coil spring is placed on which the lever movable in the vertical direction is placed is placed on one side, and the foot of the leaf spring for reversing is placed on the other side. A tact lever having a back surface that presses the movable plate is formed into a substantially L-shape, and a shaft for rotating the legs and the back surface in a plane perpendicular to the plane of the frame is rotatably passed through the substantially central corner of the L shape, Both ends of the shaft are fixed to the frame perpendicular to the moving direction of the lever, the back of the tact lever is brought into contact with the movable plate of the reversing leaf spring, and the legs are fitted with rubber spring supports. A first contact mechanism, a fixed side terminal with a fixed contact provided on one side of a second frame having a flat plate shape and a hole provided approximately in the center of the surface, and a movable side terminal that conducts with the movable contact are attached. A movable plate spring having the movable contact and a U-shaped portion is provided on the other surface of the iron frame, the movable plate spring and the movable terminal are fitted together, and the fixed contact and the movable contact are opposed to each other. A second contact mechanism is arranged in parallel with the surface on which the fixed terminal and movable side terminal of the first contact mechanism are attached and the surface on which the movable leaf spring of the second contact mechanism is attached inside, and both The lower part of the frame of the contact mechanism is fixed to the low plate, and the coil spring, the lever, and the elastic body provided directly below the lever and fixed to the low plate are arranged in the gap between the two contact mechanisms, and the first In the operating section, the operating force of the lever is transmitted to the first contact mechanism via the coil spring to operate it, and in the second operating section, the operating protrusion and U-shaped portion provided on the lever actuate the second contact mechanism. The invention is characterized in that the lever deforms the elastic body in the second operation section to enable the lever to be depressed and lowered.Examples of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. In the figure, 1 is a case having a slit 11 on the upper surface and locking grooves 12 and 13 on the left and right sides.

Reference numeral 2 denotes a lever, which has a projection 21 at its upper end into which a push button is fitted, a groove 22 at its lower end, a spring locking portion 23 at the upper end of the groove 22, and an operating projection 24 at its side.

3 is a coil spring, 4 is a lower case, and locking pieces 42 and 43 are provided protruding from the sides of the bottom plate 41.

Further, the bottom plate 41 is provided with square holes 44 to 47 through which terminals provided in two contact mechanisms to be described later are inserted, and a recess 4 is formed in the center.
8 is provided.

In the recess 48, a cylindrical projection 49 and diode locking pieces 49a and 49b are provided.

Reference numerals 5 and 6 are contact mechanisms that perform different switching operations, and the detailed structure of each will be described later.

7 is a rubber seat and has a locking hole 71.

8 is an accessory diode.

The contact mechanism 5 includes a tact lever 51 as shown in FIG.
．． Shaft 52, reversing leaf spring 53, frame 54, movable terminal 55
, a fixed side terminal 56, and a rubber spring receiver 57.

The tact lever 51 has legs 51a<hole 51b, recess 51c
, and a back surface portion 51d.

The reversing leaf spring 53 is made of a thin beryllium copper plate, and includes frame portions 53-a, 53b, a movable contact 53c, a movable plate 53d, a lug 53e, and a lug 53f having a hole 53g.

The reversing leaf spring 53 bends the frame portions 53a and 53b during press working, thereby bending the movable plate 53d to which the movable contact 53c is attached into an arched shape.

When the movable plate 53d is pressed a certain distance in the direction of the arrow, not only the movable plate 53d but the entire reversing leaf spring is reversed at a certain point.

During this reversal operation, a distinct licking sound is emitted.

When the movable plate 53d is released from the pressure, it makes a click sound and returns to its original state.

The frame 54 has protrusions 54a and 54b, grooves 54c and 5
4d, a hole 54e, and a square hole 54f.

The movable terminal 55 has a small hole 55a and a bent end 55b.
has.

The fixed side terminal 56 has a small hole 56a, and a fixed contact 56b is attached thereto.

The contact mechanism 5 is assembled as follows.

First, the small hole 56a provided in the fixed terminal 56 is inserted into the protrusion 54a of the frame 54, and then the tip of the protrusion 54a is thermally deformed to attach the fixed terminal 56 to the frame 54, and the small hole 55a provided in the movable terminal 55 is first inserted. The protrusion 5 is inserted into the protrusion 54b of the frame 54, and the end 55b is inserted into the square hole 54f of the frame 54.
The movable side terminal 55 is attached to the frame 54 by thermally curving the tip of 4b.

Next, attach the ears 53e and 53f of the reversing leaf spring 53 to the frame 5.
4 into the grooves 54c and 54d.

At this time, the end 5 of the movable terminal 55 protrudes into the groove 54c.
5b passes through the hole 53g of the ear piece 53f.

Then, the end portion 55b' is bent or twisted to electrically connect the reversing leaf spring 53 and the movable terminal 55.

After that, the foot 51a of the tact lever 51 is connected to the reversing leaf spring 5.
After inserting the shaft 52 into the slit between the frames 53a, 53b and the movable plate 53d of No. 3, the shaft 52 is inserted into the hole 54e of the frame 54 and the hole 51b of the tact lever 51, and the tact lever 51 is moved to the frame 5.
Finally, fit the rubber spring receiver 57 into the recess 51c provided in the leg 51a of the tact lever 51.

Note that FIG. 3 is a perspective view showing the front of the assembled contact mechanism 5, and FIG. 4 is a perspective view showing the back.

As shown in FIG. 5, the contact mechanism 6 includes a movable plate spring 61.
It consists of a frame 62, a movable side terminal 63, and a fixed side terminal 64.

The movable leaf spring 61 is formed by press punching a thin beryllium copper plate, and has a small hole 61b and a cross recess 61f in its base 61a.

The tip of the central contact piece 61c is bent to form a U-shaped portion 61.
The 0 frame 62 is provided with a protrusion 62a and a protrusion 62b on one side, and has a protrusion 62a and a protrusion 62b on the other side. Although not included, a protrusion for attaching a movable leaf spring is provided and a square hole 62c is provided.

The 5T movable side terminal 63 has a small hole 63a and an end portion 63b.

The fixed terminal 64 has a small hole 64a and a fixed contact 64b.

The contact mechanism 6 is assembled as follows.

1. First, the small hole 64a provided in the fixed side terminal 64 is inserted into the protrusion 62b of the frame 62, and then the tip of the protrusion 62b is thermally deformed to attach the fixed side terminal 64 to the frame 62, and the fixed side terminal 64 is attached to the movable side terminal 63. After inserting the small hole 63a into the protrusion 62a of the frame 62 and inserting the end 63b into the square hole 62C of the frame 62, the tip of the protrusion 62a is thermally deformed to form the movable terminal 63.
is attached to the frame 62.

Next, the movable leaf spring 61 is protruded from a surface of the frame 62 opposite to the side on which the movable and fixed side terminals are attached (not shown).
The movable leaf spring 61 is fixed to the frame 62 by thermally deforming the tip of a refining projection inserted into the small hole 61b of the movable leaf spring 61.

At this time, the end portion 63b of the movable terminal 63 protruding into the cross recess 61f of the movable leaf spring 61 is bent or twisted to electrically connect the movable leaf spring 61 and the movable terminal 63.

It should be noted that the contact mechanism 6 shown in FIG. 1 is a front view of the contact mechanism 6 viewed from an oblique direction, and FIG.

Next, the assembly of the push button switch of the present invention will be explained using FIG.

1. First, insert the diode 8 between the locking pieces 49a and 49b provided in the recess 48 of the lower case 4, then insert the locking hole 71 of the rubber seat 7 into the protrusion 49, and then attach the rubber seat 7 to the lower case 4. It is stored in the recess 48 of.

Next, after inserting the movable side terminal 55 and fixed side terminal 56 of the contact mechanism 5 into the square holes 46 and 47 provided in the bottom plate 41 of the lower case 4, these terminals are caulked on the lower surface of the bottom plate 41, and the contact mechanism 5 is attached to the lower case. Fixed at 4.

Furthermore, after inserting the movable side terminal 63 and fixed side terminal 64 of the contact mechanism 6 into the square holes 44 and 45 provided in the bottom plate 41 of the lower case 4, these terminals are caulked on the lower surface of the bottom plate 41, and the contact mechanism 6 is attached to the lower case. ○ Next, place the coil spring 3 on the rubber spring receiver 57 of the contact mechanism 5, and then place the lever 2 on the coil spring 3 by inserting the coil spring 3 into the groove 22 of the lever 2. .

At this time, the spring locking portion 23 provided at the upper end of the groove 22 of the lever 2 fits into the upper end of the coil spring 3.

Finally, the case 1 is placed over the lower case 4, and the locking pieces 42 and 43 of the lower case 4 are engaged with the locking grooves 12 and 13 of the case 1.

At this time, the protrusion 21 of the lever 2 projects outward from the slit 11 of the case 1.

FIG. 7 is a sectional view of the assembled push button switch.

Next, the operation of the push button switch according to the present invention will be explained.

When the protrusion 21 of the lever 2 is pressed downward, the coil spring 3 is compressed, and the pressing force is transmitted to the rubber spring support 57, which presses the leg 51a of the tact lever 51 downward.

Then, the tact lever 51 is inserted into the hole 5 provided at the corner of the tact lever 51.
It performs rotational movement using the shaft 52 inserted through 1b as a pivot point,
The back surface portion 51d presses the movable plate 53d of the reversing leaf spring 53.

However, when the pressing force reaches a certain value, the coil spring 3 is only compressed and the reversing leaf spring 53 is not reversed.

When the force with which the back surface 51d of the tact lever 51 presses the movable plate 53d of the reversing leaf spring 53 reaches a certain value necessary to reverse the reversing leaf spring 53, the reversing leaf spring 53 emits a click sound. As it is reversed, a light click sensation is transmitted to the operator's fingers, and the movable contact 53c and fixed contact 56
b makes contact, and the contact mechanism 5 turns on.○ When the pressure on Reno<-2 begins to release, the coil spring 3
starts to extend, but in 1, the force with which the back surface 51d of the tact lever 51 presses the movable plate 53d of the reversing leaf spring 53 weakens at the point where the reversing leaf spring 53 returns, so that the lever 2 only rises. The reversing leaf spring 53 is in the inverted state.
It is.

Then, when the pressing force of the movable plate 53d weakens to a constant value of 1, the reversing leaf spring 53 makes a click sound again and returns to its original state, and a light click sensation is transmitted to the operator's fingers, and the movable contact 53c is fixed. The contact 56b is separated and the contact mechanism 5 is turned off.

The operation of the contact mechanism 5 in the first operation section as described above is such that the lever position when the switch is on and the lever device when the switch is off are different depending on the combination of the coil spring 3 and the reversing leaf spring 53. A so-called hysteresis operation is performed.

The solid line portion in FIG. 8 shows this hysteresis operation.

Now, when the lever 2 is pressed and the contact mechanism 5 is switched on, the lower end 25 of the lever 2 is in a state in which it lightly contacts the surface of the rubber seat 7.

At this time, if the lever 2 is pushed in even more strongly without loosening the operating force of the lever 2, the lower end 25 of the lever 2 strongly presses the rubber seat 7 and deforms it, allowing the lever 2 to be pushed down.

When the lever 2 is pushed all the way, the operating protrusion 24 provided on the side of the lever 2 comes into contact with the U-shaped portion 61d provided on the movable plate spring 61 of the contact mechanism 6, and moves this.

For this reason, a movable contact 61e provided at the tip of the movable leaf spring 61
contacts the fixed contact 64b, and the contact mechanism 6 is turned on.

When you stop pressing the lever 2, the deformed rubber seat 7
The restoring force causes the lever 2 to rise, and the actuation protrusion 24 and the U-shaped portion 61d are thus separated and the contact mechanism 6 is turned off.

In FIG. 8, the dotted line portion is a portion for explaining the operation of the contact mechanism 6 which is turned on and off in the second operation section of the push button switch of the present invention.

Further, in FIG. 9, the relationship between the moving position of the lever 2 and the on/off states of the contact mechanisms 5 and 6 is shown.

As explained in detail above, in the push button switch of the present invention, the operating force applied to the lever opens and closes the contacts through a coil spring and by utilizing the see-saw movement of the tact lever. The operating touch of the switch can be made very light, making the switch switching operation very light, and not only does the operator experience less fatigue even if the operator operates it many times in succession, but the switch also has hysteresis operation. This makes it possible to prevent malfunctions of the switch and ensure reliable switching operations.

In addition, the lever position for operating one contact mechanism is different from the lever position for operating the other contact mechanism, and the operating force for operating these two contact mechanisms is also different, so one lever can operate two circuits. They can be operated separately and reliably.

Therefore, in the push button switch of the present invention, one contact mechanism can be used as a printing key for an electronic typewriter.
Furthermore, the other contact mechanism can be used for repeat operation.

Furthermore, the push button switch of the present invention has two contact mechanisms that have the above effects arranged parallel to the moving direction of the lever.
One contact mechanism can be installed, and another contact mechanism can be installed on the other half, and a remaining part with the contact mechanism attached is created on the tap root of the lower case. Diodes and the like used for the N-key rollover circuit can be provided, and there is no need to provide them outside the switch.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an embodiment of the present invention, Figs. 2 and 5 are exploded perspective views of the contact mechanism, Figs. 3, 4, and 6 are perspective views of the contact mechanism; Figure 7 is a cross-sectional view, Figure 8
9 and 9 are explanatory diagrams of the operation of the push button switch. In the figure, 1 is a case, 11 is a slit, 12 and 13 are locking grooves, 2 is a lever, 21 is a projection, 22 is a groove, 24 is an operating projection, 25 is a lower end, 3 is a coil spring, 4 is a lower case, 41 is a bottom plate, 42 and 43 are locking pieces, 44 to 47 are square holes, 5 is a contact mechanism, 51 is a tact lever, 51
a is a foot, 51d is a back part, 52 is a shaft, 53 is a reversing leaf spring, 53c is a movable contact, 53d is a movable plate, 54 is a frame, 5
5 is a movable side terminal, 56 is a fixed side terminal, 56b is a fixed contact, 57 is a rubber spring holder, 6 is a contact mechanism, 61 is a movable leaf spring, 61d is a U-shaped part, 61e is a movable contact, 62 is a frame , 63 is a movable side terminal, 64 is a fixed side terminal, 64b is a fixed contact, 7 is a rubber seat, 71 is a locking hole, and 8 is a diode.

Claims (1)

[Scope of utility model registration request] A fixed terminal having a fixed contact on one side of a first frame having a flat plate shape and having a hole extending through a tact lever that presses a movable contact at approximately the center of the surface, and a movable side terminal that is electrically connected to the movable contact. A reversing leaf spring having the movable contact is provided on the other surface of the blade, and the reversing leaf spring and the movable side terminal are fitted, and the fixed contact and the movable contact are opposed to each other, and one A tact lever with a back surface that presses a movable plate of a reversing leaf spring, and a leg that fits a rubber spring holder on which a coil spring is placed, on which a lever that can be moved vertically is placed, is placed on the other side. It is formed into a letter shape, and a shaft for rotating the legs and the back in a plane perpendicular to the plane of the frame is rotatably passed through the almost central corner of the L shape, and both ends of the shaft are connected to the moving direction of the lever. A first contact mechanism is fixed vertically to the frame, the back side of the tact lever is brought into contact with the movable plate of the reversing plate spring, and a rubber spring receiver is fitted to the leg; A fixed side terminal with a fixed contact provided thereon and a movable side terminal that conducts with the movable contact are attached to one side of a second frame with a hole provided approximately in the center of the surface, and the movable contact and the U-shaped portion are attached to the other side of the frame. A second contact mechanism is provided with a movable leaf spring provided with a movable leaf spring, the movable leaf spring and the movable side terminal are fitted, and the fixed contact and the movable contact are opposed to each other.
The surface on which the fixed terminal and movable side terminal of the first contact mechanism are attached and the surface on which the movable leaf spring of the second contact mechanism is attached are arranged in parallel with each other, and the lower part of the frame of both contact mechanisms is attached to the bottom plate. The coil spring, the lever, and an elastic body provided directly below the lever and fixed to the bottom plate are disposed in the gap between both contact mechanisms, and the operating force of the lever is transferred to the coil spring in the first operation section. The transmission is transmitted to the first contact mechanism through the lever to operate it, and the second contact mechanism is operated by the operating protrusion and U-shaped portion provided on the lever in the second operation section, and in the second operation section. A push-button switch characterized in that the lever deforms an elastic body to enable the lever to be depressed and lowered.