JPS5821052Y2 - push button switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a push button switch that has a clear switching sensation and can perform light switching operations.

Leaf spring contact type pushbutton switches used in computer terminals and electric typewriters have a reversing spring made by bending a thin plate of beryllium steel, similar to those used in microswitches, arranged flat on the tap root. The reversing spring is vertically pressed by an operating member equipped with a push button to reverse the reversing spring, and the movable contact attached to the reversing spring is brought into contact with the fixed contact on the tap root to turn on the switch.

When the user stops pressing the released pushbutton, 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 plate of beryllium steel, 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. This makes it impossible to provide a plurality of switching circuits or to provide an accessory mechanism such as a locking mechanism for a push button.

The present invention is a novel invention that improves the above-mentioned drawbacks of the conventional technology, and its purpose is to provide a leaf spring contact type push button switch that has a space within the housing to accommodate an accessory mechanism. .

In order to achieve this purpose, the push button switch of the present invention has a fixed terminal that is formed into a flat plate and has a fixed contact on one side of the frame, which has a hole in the center of the plate that passes through the tact lever that presses the movable contact. and a movable side terminal that is electrically connected to the movable contact, a reversing plate spring having the movable contact provided on the other side of the frame, and fitting the reversing plate spring and the movable side terminal, and a fixed contact. The movable contact points face each other, and the leg that fits the rubber spring holder on which the coil spring is placed, which places a lever that can be moved vertically on one side, presses the movable plate of the reversing leaf spring on the other side. A tact lever having a back surface that is approximately L-shaped is formed, 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 approximately central corner of the L shape, and both ends of the shaft are provided. is 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 spring, a rubber spring receiver is fitted to the foot, and the surface of the frame is The lever is arranged parallel to the moving direction of the lever, the coil spring is interposed between the lever and the rubber spring holder of the tact lever, the laxative of the frame is placed on the bottom of the lower case, and the lever is moved. This device is characterized in that its upper portion projects outward from the upper surface of the case, and the reversing leaf spring is reversed by pressing the lever.Examples will be described in detail below with reference to the drawings.

FIG. 1 is an exploded perspective view showing an embodiment of the present invention. In the figure, numeral 10 denotes a case having a slit 101 on the top surface and locking grooves 102 and 103 on the left and right sides.

Reference numeral 11 denotes a lever, which has a protrusion 111 on its upper end into which a push button is fitted, and a groove 112 in the laxative.

12 is a coil spring.

Reference numeral 13 designates a lower case, which has a bottom plate 131 with stands 132 and 133 on which a contact mechanism, which will be described later, is placed, square holes 134 and 135 through which terminals of the contact mechanism are inserted, and locking pieces 136 on both sides. It has 137.

14 is a contact mechanism.

The contact mechanism 14 is connected to the tact lever 1 as shown in FIG.
, a shaft 2, a reversing leaf spring 3 with a movable contact 4, a frame 5, a movable terminal 6, a fixed terminal 8 with a fixed contact 7, and a rubber spring receiver 9.

The tact lever 1 has a leg 1a on which a coil spring 12 is placed via a rubber spring holder 9, and a back surface 1d that presses a movable plate 3c of a reversing plate spring 3 at both ends. It is formed in the shape of a letter, and a hole 1b through which the shaft 2 is inserted is provided at the corner.

The reversing leaf spring 3 is made of a thin beryllium copper plate, and when pressed, by bending the frame parts 3a and 3b,
The movable plate 3c on which the movable contact 4 is attached is bent into an arched shape.

Then, when the movable plate 3C is pressed a certain distance in the direction of the arrow, not only the movable plate 3c but the entire plate spring 3 is reversed at a certain decisive point.

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

When the pressure on the movable plate 3c is released, the reversing plate 3/I'i makes a click sound at a certain point and returns to its original state.

The contact mechanism 14 is assembled as follows.

1. First, the protrusion 5a provided on one side of the frame 5 is inserted into the small hole 8a provided in the fixed terminal 8, and then the tip of the protrusion 5a is thermally deformed to attach the fixed terminal 8 to the frame 5, and the movable terminal 6 The movable side terminal 6 is attached to the frame 5 by inserting a protrusion 5b provided on one side of the frame 5 into a small hole 6a provided in the frame 5, and then thermally deforming the tip of the protrusion 5b.

Next, the lug 3d of the reversing leaf spring 3 is fitted into the groove 5C of the frame 5, and the lug 3e is fitted into the groove 5d.

At this time, the end 6b of the movable terminal 6 protruding into the groove 5c
fits into the hole 3f of the ear piece 3d.

Then, by bending the end portion 6b, the reversing leaf spring 3 and the movable terminal 6 are electrically connected.

Then, after inserting the leg 1a of the tact lever 1 into the slit between the frame of the reversing leaf spring 3 and the movable plate, the shaft 2 is inserted into the frame 5.
The tact lever 1 is pivotally attached to the frame 5 by passing through the hole 5e provided on the other surface and the hole 1b of the tact lever 1.

Finally, the rubber splash receiver 9 is fitted into the recess 1c provided in the foot 1a of the tact lever 1.

Furthermore, FIG. 3 is a perspective view showing the front of the assembled contact mechanism 14, and FIG. 4 is a perspective view showing the back.

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

The frame 5 of the contact mechanism 14 is placed on stands 132 and 133 provided at the end of the bottom plate 131 of the case 13, and the fixed side terminal 8 and movable side terminal 6 are inserted into the square holes 134 and 135.

Next, the coil spring is placed on the rubber spring receiver 9 of the contact mechanism 14, and the lever 11 is placed on the coil spring 12 so that the coil spring 12 fits into the groove 112 of the lever 11.

Finally, cover the lower case 13 with the case 10, and
The locking pieces 136 and 137 are locked into the locking grooves 102 and 103 of the case 10 to be integrated.

At this time, the projection 111 of the lever 11 projects outward from the slit of the case 10.

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

When the protrusion 111 of the lever 11 is pressed downward, the coil spring 12 is compressed, and the pressing force is transmitted to the rubber spring receiver 9, which presses the foot 1a of the tact lever 1 downward.

Then, the tact lever 1 opens the hole 1b provided at the corner of the tact lever 1.
Rotating around the shaft 2 inserted into the back 1
d presses the movable plate 3c of the reversing leaf spring 3.

Therefore, a pressing force is applied to the movable plate 3c of the reversing plate spring 3 via the tact lever 1.

However, when the pressing force reaches a certain value 1, the coil spring 12 is only compressed and the reversing plate spring 3 is not reversed.

The back part 1d of the tact lever 1 is the movable plate 3 of the reversing plate spring 3.
When the force pressing c exceeds a certain value necessary to reverse the reversing leaf spring 3, the reversing leaf spring 3 emits a click sound and reverses, and a light click sensation is transmitted to the operator's fingers, and the movable contact 4 and fixed contact 7 come into contact, and the switch is turned on.

When you start releasing the pressure on the lever 11, the coil spring 1
3 begins to extend, but the force with which the back @1d of the tact lever 1 presses the movable plate 3C of the reversing leaf spring 3 causes the reversing leaf spring 3 to
At point 1, which is weakened at point 1 where the lever 11 returns, the lever 11 only rises, and the reversing leaf spring 3 is in an inverted state 11.

Then, when the pressing force of the movable plate 3c weakens to a constant value of 1, the reversing leaf spring 3 again makes a click sound and returns to its original state, and a light click sensation is transmitted to the operator's fingers.
The movable contact 4 and the fixed contact 7 are separated and the switch is turned off.

In this way, the push button switch of the present invention has a so-called hysteresis operation in which the lever position when the switch is turned on is different from the lever position when the switch is turned off by combining the coil spring 12 and the reversing leaf spring 3. Let's do it.

FIG. 5 is a graph for explaining hysteresis operation.

As explained in detail above, the push button switch of the present invention is
Since the flat contact mechanism with the reversing leaf spring is arranged parallel to the moving direction of the lever, half of the space on one side of the case can be left open.

Therefore, another contact mechanism, an indicator lamp, a locking device for the contact mechanism, or a circuit component such as a diode can be housed in this area. .

In addition, since the actuation force applied to the lever is transmitted to the movable contact via a coil spring, the switching action is very light, and the operator will experience less fatigue even if the operator operates it many times in succession. Alternatively, it is possible to provide a hysteresis operation for switching the switch, thereby preventing malfunction of the switch and ensuring reliable switching operation.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of a contact mechanism, FIGS. 3 and 4 are perspective views,
FIG. 5 is a graph for explaining the hysteresis operation of the push button switch. In the figure, 1 is a tact lever, 1a is a foot, 1b is a hole, 1c is a recess, 1d is a back surface, 2 is a shaft, 3 is a reversing leaf spring, 3a and 3b are frame parts, 3c is a movable plate, and 3d. 3e is an ear piece, 3f is a hole, 4 is a movable contact, 5 is a frame, 5a and 5b are protrusions, 5c and 5d are grooves, 5e is a hole, 6 is a movable side terminal, 6a is a small hole, 6b is an end, 7 is a fixed contact, 8 is a fixed terminal, 8a is a small hole, 9 is a rubber spring holder, 10 is a case, 101 is a slit, 102 and 103 are locking grooves, 11
111 is a protrusion, 112 is a groove, 12 is a coil spring, 13 is a lower case, 131 is a bottom plate, 132 and 1
33 is a stand, 134 and 135 are square holes, 136 and 137 are locking pieces, and 14 is a contact mechanism.

Claims (1)

[Scope of utility model registration request] A fixed terminal with a fixed contact and a movable side terminal that conducts with the movable contact are attached to one side of the frame, which is formed in a flat plate shape and has a hole through the tact lever that presses the movable contact at approximately the center of the frame. A reversing leaf spring having the movable contact is provided on the other surface, and the reversing leaf spring and the movable side terminal are fitted together, and the fixed contact and the movable contact are made to face each other and are moved in the vertical direction to one side. A tact lever is formed into a substantially L-shape, and has a leg that engages a rubber spring receiver on which a coil spring is mounted, and a back surface that presses a movable plate of a reversing leaf spring on the other hand, , turn the legs and back in a plane perpendicular to the above frame at the almost central corner of the L shape.
A shaft to be rotated is rotatably passed through the shaft, and both ends of the shaft are fixed to the frame perpendicularly to the moving direction of the lever, the back of the tact lever is brought into contact with the movable plate of the reversing spring, and rubber is attached to the foot. The frame body is fitted with a spring holder made of aluminum, the surface of the frame is arranged parallel to the moving direction of the lever, and the coil spring is interposed between the lever and the rubber spring holder of the tact lever. A push button switch characterized in that a lower part of the lever is placed on the bottom surface of a lower case, an upper part of the lever projects outward from the upper case cylinder, and a reversing leaf spring is reversed by pressing the lever.