JPH0537376Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement in a push switch in which the push button reciprocates between a first position and a second position each time the push button is pressed.

[Conventional technology]

A conventional push button switch will be explained with reference to FIGS. 7 and 8.

In the figure, reference numeral 61 denotes a guide plate 62 having a heart cam groove 61a that reciprocates in conjunction with the press of a push button (not shown) for switching the switch and is always biased to the right by a spring.
is a spring whose tip 62a is inserted into the heart cam groove 61a, and the tip 62a is biased by the spring force of the coil portion 62b in the direction of the arrow and toward the bottom of the heart cam groove 61a.

The heart cam groove 61a described above is the 10th
As shown in the figure, there is a step 61 at the heart-shaped tip.
b is formed so that when the tip 62a of the spring 62 moves within the heart cam groove 61a, it moves only in one direction.

Now, with the tip 62a of the spring 62 located at the starting point 61c of the heart cam groove 61a, when the push button is pressed and the guide plate 61 is moved to the left, the spring 62
The tip 62a is the first passage a of the heart cam groove 61a.
is guided to the locking point 61d. In this state, if you release the pressure on the push button,
The guide plate 61 is connected to the tip 62 of the spring 62.
a stops at the position where it is engaged with the locking point 61d of the heart cam groove 61a. Therefore, the push button is locked in the pressed position.

Note that when the guide plate 61 moves, the tip 62a of the spring 62 is guided to the first passage a because there is a step 61b on the second passage b side. This is because they cannot overcome it.

Then, when the push button is pressed again, the guide plate 61 moves to the left, so the tip 62a of the spring 62 is released from the locking point 61d and guided to the second passage b of the heart cam groove 61a, and the pushing force of the push button is released. Then, the guide plate 61 is moved to the right by the spring force, so that the tip 62a of the spring 62 is guided to the second passage b, climbs over the step 61b via the gentle slope 61e, and returns to the starting point 61c. Therefore, the push button is locked in the protruding position.

[Problem that the invention attempts to solve]

By the way, in the push switch described above, the heart cam groove 6 of the guide plate 61
Since the portion guided by 1a locks the guide plate 61, it must be strong, and therefore the spring 62 must have a large wire diameter. For this reason, the spring properties of the spring become stronger, and the force of contact with the wall surface of the heart cam groove 61a increases, so the frictional force with the wall surface increases, resulting in poor operability and scraping of the wall surface, causing the spring 62 This has caused problems such as difficulty in guiding and engaging the tip 62a of the device, and in the worst case, locking becomes impossible and the device cannot be used.

In addition, in the push switch described above, the lock mechanism and the switch mechanism are constructed completely independently, which increases the number of parts and complicates the construction, resulting in an increase in cost. There were also problems.

Therefore, in view of the above-mentioned conventional problems, the present invention eliminates the possibility of locking due to wear even after long-term use, reduces the number of parts, simplifies the configuration, and facilitates assembly. The purpose of the present invention is to provide a push switch that can reduce costs.

[Means for solving problems]

In order to achieve the above object, the push switch according to the present invention has a push button and a fixed contact base plate that holds the push button in a spring biased state and is provided with a fixed contact plate. a base, a movable contact board having a movable contact plate that is pivotally supported by the fixed contact base part of the base, rotates in conjunction with the push button, and moves on the fixed contact plate; The tip faces the heart cam groove formed in the base, and the outside of the one side and the inside of the other side are regulated by a stopper surface formed on the movable contact board, and each side is lifted from the stopper surface. The lock pin is provided with an L-shaped lock pin that can be tilted only in the direction, and a spring that biases the other side of the lock pin and holds the inside of the other side in elastic contact with the stopper surface, and the push button is pressed. When the tip of one side of the lock pin traces the heart cam groove in response to an operation, the lock pin is rotated against the bias of the spring using the stopper surface that the one side of the lock pin contacts as a fulcrum. It is characterized by

[Effect]

The push switch has a lock pin attached to a movable contact board that moves in conjunction with the push button, and the lock pin is urged by a spring to press against a heart cam groove formed in a fixed contact board. By applying a spring force to the bottom of the heart cam groove and pressing the push button, the movable contact board is rotated to switch the contacts, and when the pressing force of the push button is released,
Since the locking pin and the heart cam groove are engaged to maintain the rotating state of the movable contact board and thereby lock the push button, the biasing force of the spring can be set to the minimum necessary, and therefore As shown in the figure, the heart cam groove is not cut, and the operation is light and the operability is improved.

Moreover, an L-shaped lock pin is adopted, and the tip of one side faces the heart cam groove formed on the base, and the stopper surface formed on the movable contact board regulates the outside of one side and the inside of the other side. It can be tilted only in one direction with each side floating from the stopper surface,
The other side of the lock pin is biased by a spring so that the inner side of the other side comes into elastic contact with the stopper surface and is held, and when the tip of one side traces the heart cam groove in response to pressing the push button, the lock pin Since the lock pin rotates against the bias of the spring using the stopper surface with which one side comes into contact as a fulcrum, the structure is simplified and the workability of assembly is improved.

[Example of idea]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

1 is a base made of synthetic resin, and has a fixed contact board part 11 on which a plurality of fixed contact plates 11a and 11a' are attached on both sides, and two push buttons 2, which will be described later.
2' is slidably inserted into the button storage section 12,1.
2'. Further, the guide wall portion 12 through which the guide portions 21, 21' of the push buttons 2, 2' are inserted into the button storage portions 12, 12' of the base 1 is provided.
a, 12a' are formed, and the bottom plate 13 is also formed with a spring receiving portion 13a.

Push buttons 2 and 2' are formed in similar shapes,
Since it is symmetrical as shown in FIG. 3, only the structure related to the push button 2 will be described below.

A guide portion 21 having a forked tip is formed on the back surface of the pushbutton 2, and a pressing surface 22 is formed on the back surface of the push button 2.
A spring receiving portion 22a is formed on the back surface of the spring receiving portion 22a. Note that a long hole 2 is provided in the forked portion of the guide portion 21.
1a is formed.

Reference numeral 3 denotes a spring that is compressed between the spring receiving part 13a of the base 1 and the spring receiving part 22a of the push button 2, and always biases the push button 2 in the direction of coming out from the base 1. .

4 is a shaft 11 attached to the fixed contact board portion 11 of the base 1.
The movable contact board is rotatably supported at b, and the movable contact 41, which is in sliding contact with the fixed contact plate 11a, is pressed by a spring (not shown) on the surface facing the fixed contact board part 11. It is installed in The movable contact board 4 also has a long hole 21a formed in the guide portion 21 of the push button 2.
A protrusion 42 that is fitted into the protrusion 42 is provided in a protruding manner.

Reference numeral 5 denotes a lock pin formed by bending a wire into an L-shape, and the tip of one side 53 of the L-shape faces into the heart cam groove 11c, and the other side 54 faces the movable contact base plate 4. It is accommodated in a recess 43a formed in the curved surface 43. In order to make the tip of one side 53 of the L-shaped locking pin 5 with the other side 54 accommodated in the recess 43a face the heart cam groove 11c as described above, the movable contact board 4 has a curved surface that communicates with the recess 43a. 43
A communication hole 43b is formed so as to open in a plane perpendicular to , and one side 53 is passed through this communication hole 43b so that its tip is protruded.

A spring 6 is installed between the other side 54 of the lock pin 5 housed in the recess 43a and the inner wall surface of the recess 43a, and the biasing force of the spring 6 causes the inner side 54 of the lock pin 5 to It is pressed and held against the inner wall surface which acts as a stopper surface A facing the inner wall surface. In this state, the outside of one side 53 of the lock pin 5 abuts against the inner wall surface that serves as the stopper surface A of the communicating hole 43b, and the lock pin 5 is held so as to tilt in only one direction from the state shown by the solid line to the state shown by the broken line. .

Therefore, the movable contact board 4 is rotated about the shaft 11b, and the lock pin 5 is moved into the heart cam groove 11c.
When moving along a slope, so-called tracing, if there is an inclined surface on the way, the lock pin 5 is pressed against the spring 6.
The other side 54 in the recess 43a is rotated as shown by the dotted line using the stopper surface B as a fulcrum against the bias of the
When it comes to rise from the stopper surface A and passes through the inclined surface, it returns to its original state by the biasing force of the spring 6.

A case 7 covers the outer periphery of the movable contact plate 4, and is fitted and fixed to the lower surface of the bottom plate 13 of the base 1.

The tip of the fixed contact plate 11a attached to the fixed contact board 11 is projected into a connector insertion portion 71 formed in the case 7, and is connected to a connector (not shown).

Next, to explain the operation based on the structure described above, when the push button 2 is pressed against the spring force of the spring 3, the movable contact board 4 moves through the guide portion 21 of the push button 2 and pushes the shaft 11b. It is rotated counterclockwise in FIG. 2 as a fulcrum. Thereby, switching between the fixed contact plate 11a of the fixed contact board section 11 and the movable contact 41 of the movable contact board 4 on the base 1 is performed.

Further, when the movable contact board 4 is rotated, one side 5 of the lock pin 5 attached to the movable contact board 4 is rotated.
3 moves while being pressed by the spring 6 against the wall surface of the heart cam groove 11c formed in the fixed contact base plate portion 11. And push button 2
When the pressing force is released, the push button 2 tries to return together with the movable contact board 4 due to the spring force of the spring 3, but at this time, the tip of one side 53 of the lock pin 5 reaches the locking point of the heart cam groove 11c. engaged. Therefore, since the movable contact board 4 is locked at this position, the push button 2 also stops halfway without returning completely.

Note that in this state, the fixed contact plate 11a and the movable contact 41 maintain the switched state.

Next, when the push button 2 is pressed again, the tip of the side 53 of the lock pin 5 comes off the stopping point of the heart cam groove 11c, so when the pressing force of the push button 2 is released in this state, the tip of the side 53 of the lock pin 5 It moves along the heart cam groove 11c and returns to the starting point. At this time, the tip of one side of the lock pin 5 passes through the inclined surface of the heart cam groove 11c, but since the lock pin 5 can freely return to its original state by the spring 6, the tip of one side 53 of the lock pin 5 passes through the inclined surface. to reach the starting point. Therefore, the movable contact board 4 returns to its original state and the contacts are switched to their original states. The pushbutton 2 also returns to its original position.

[Effect of idea]

As described above, the present invention involves attaching an L-shaped lock pin to a movable contact board that is displaced in conjunction with a push button, with the tip of one side of the lock pin facing the heart cam groove, and a biasing force applied to the other side by a spring. By making the lock pin tiltable so that it can be restored, the biasing force of the spring can be set to the minimum necessary, and therefore the pressing force of the lock pin against the heart cam groove can be made smaller than before. It is possible to reduce the wear of the grooves, thereby increasing the service life and improving the operability.

In addition, the lock pin and heart cam groove are formed on the movable contact board and the fixed contact board, so that
Not only can the number of parts be reduced, but the lock pin can also be formed by bending a wire into an L-shape, so the manufacturing process can be simplified and the cost of parts can be reduced.

Furthermore, the reduction in assembly man-hours and the use of locking pins bent in an L-shape make the assembly process easier, reducing assembly time and lowering product costs. It has the following.

[Brief explanation of drawings]

1 to 6 show an embodiment of the push switch according to the present invention, and FIG. 1 is a front view;
Fig. 2 is a cross-sectional view taken along the - line in the same as above, Fig. 3 is a cross-sectional view taken in - line in the same as above, Fig. 4 is a plan view showing the relationship between the heart cam groove and the lock pin, and Figs. 5 and 6 are a - line in the same as above. , a sectional view taken along the - line, FIGS. 7 and 8 are a plan view and a sectional view of the lock portion of a conventional switch. DESCRIPTION OF SYMBOLS 1...Base, 11...Fixed contact board part, 11a
...Fixed contact plate, 11c...Heart cam groove, 2...
...Push button, 3, 6...Spring, 4...Movable contact board, 41...Movable contact plate, 5...Lock pin, 53...One side, 54...Other side, A, B...
Stotsupa side.

Claims (1)

[Scope of Claim for Utility Model Registration] A push button, a base that holds the push button in a spring-biased state and has a fixed contact board portion provided with a fixed contact plate, and a fixed contact board of the base. a movable contact board having a movable contact plate that is pivotally supported by the pushbutton, rotates in conjunction with the push button, and moves on the fixed contact plate; and a heart cam groove whose tip on one side is formed in the base. At the same time, the outer side of the one side and the inner side of the other side are regulated by the stopper surface formed on the movable contact substrate, and each side is free to tilt in one direction with each side floating from the stopper surface. a lock pin; and a spring that biases the other side of the lock pin and holds the inner side of the other side in elastic contact with the stopper surface, and the tip of one side of the lock pin is pressed in response to a pressing operation of the push button. 2. A push switch according to claim 1, wherein when the lock pin traces the heart cam groove, the lock pin is rotated against the bias of the spring using a stopper surface that one side of the lock pin comes into contact with as a fulcrum.