JPH0334809Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a single-acting mechanism for a switch used in push switches, etc., and more specifically, the state in which the slider is locked at a predetermined movement position and the state in which the slider is unlocked and returned to its original position. This relates to the single-acting mechanism of the switch that alternately repeats the following.

For example, as shown in FIGS. 1 to 3, a conventional single-acting mechanism of this type includes a drive pin made by bending a wire rod at the bottom of a heart-shaped cam groove 1a formed in a slider 1. The end portions 2a of 2 were always brought into contact substantially perpendicularly by the biasing force of the leaf spring 3.

To explain the operation of this mechanism, as shown in FIG. and move it in the direction of arrow A. Then, the end portion 2a passes through position a, passes through the stepped portion 1b, and reaches position b. When the pressing force on the slider 1 is released, the slider 1 moves in the direction of arrow B due to the biasing force of the spring 4, and the end portion 2a reaches the position b through the stepped portion 1b. Part 2a
The slider 1 reaches position c without returning to position a due to the stepped portion 1b, and the slider 1 is locked at a predetermined movement position. Furthermore, when the slider 1 is moved again in the direction of arrow A from the state where the end portion 2a is at position c, the lock of the slider 1 is released and the end portion 2a is moved in the direction of arrow A again.
passes through the stepped portion 1c and reaches position d. Then, when the pressing force on the slider 1 is released, the slider 1 passes through the stepped portion 1d to the position e, and then passes through the stepped portion 1e and returns to the original position f, so that the slider 1 cannot be pushed or released. As a result, the state of being locked at position c and the state of returning to the original position f are alternately repeated.

To make such a movement, the end 2a of the drive pin 2 is always held in the heart-shaped cam groove 1a by the leaf spring 3.
It had to be brought into contact with the That is, since the heart-shaped cam groove 1a is formed with step portions 1b, 1c, 1d, and 1e that prevent it from returning, and there is a difference in height, if the end portion 2a is not always in contact with the heart-shaped cam groove 1a, Step portions 1b, 1c, 1d, 1e
This was because it did not fulfill its role and single-acting operation could not be obtained.

However, in the single-acting mechanism of such a conventional switch, the long plate-shaped leaf spring 3 is disposed in approximately the same direction as the drive pin 2, so the single-acting mechanism is difficult to operate. If it is made thin, the end portion 2a is lowered from the lower step portion 1b, 1 as shown in FIG.
When the plate spring 3 is raised by c, 1d, and 1e, the area of contact between the plate spring 3 and the drive pin 2 increases, and the plate spring 3 receives stress at its root, which may cause it to become easily damaged. Along with that, leaf spring 3
There was a problem in that the installation range was limited because the gap was narrow, making it difficult to install.

Therefore, the object of this invention is to provide a single-acting operating mechanism for a switch that is thin, yet allows easy installation of the leaf spring, and improves the durability of the leaf spring.

Therefore, in the single-action operating mechanism of the switch according to this invention, the leaf spring is made substantially orthogonal to the direction in which the drive pin is arranged, and a component force is applied toward the end of the drive pin from a predetermined position toward the advancing side. It is characterized by being brought into contact with each other at an angle like this.

This invention will be explained below based on the drawings. The same reference numerals are given to parts or members that are the same as or equivalent to the conventional ones, and redundant explanations will be omitted.

FIGS. 4 to 9 are diagrams showing an embodiment of this invention.

First, to explain the structure, this single-acting mechanism is composed of a slider 1, a drive pin 2, and a leaf spring 13, and is used in, for example, a push switch.

The slider 1 has a storage part 1f formed on both sides of a heart-shaped cam groove 1a in which a movable contact 14 is stored, and this storage part 1f is slidably provided in a switch body 15 having an opening 15a formed at one end. There is. The movable contacts 14 stored in the storage portion 1f can slide into three fixed contacts 16 on each side, which are planted on the insulating base 15b of the switch body 15. The configuration is such that the connection form to the fixed contact 16 changes. Further, one end of the spring 4 of the slider 1 is brought into contact with the cover 15c of the switch body 15, and urges the slider 1 in the direction of arrow B in FIG. On the other hand, the drive pin 2 is disposed along the moving direction of the slider 1, and has one end 2c pivotally attached to the cover 15c of the switch body 15, and the other end 2a via the intermediate part 2b. It is located within the heart-shaped cam groove 1a and is biased by a leaf spring 13 attached to the cover 15c. This leaf spring 13 is attached to a base plate 17 as shown in FIG.
It is formed by cutting and raising it, and there is a bead 1 in the center
3a is provided, and the substrate 17 is attached to the cover 15c, so that the drive pin 2 is disposed substantially orthogonally to the direction in which the drive pin 2 is disposed, and urges the drive pin 2. This urging direction is not only the direction in which the cam surface is pressed, but also the direction in which the leaf spring 13 engages with the drive pin 2 while tilting in a predetermined direction as shown in FIG. It is set so that a component force acts in the D direction (direction on the traveling side). Here, the positions f, a, and b of the heart-shaped cam groove 1a in FIG. 5 are referred to as the advancing side, and the positions d, e, and f are referred to as the returning side. Also,
Here, the contact portion of the leaf spring 13 with the drive pin 2 is not limited to the tip as in the conventional case, but has a certain degree of freedom and is always a point contact.

The operation of the single-acting mechanism used in the push switch will now be explained. First, as shown in FIG. 5, when the slider 1 is moved in the direction of arrow A against the biasing force of the spring 4 from the state where the end 2a of the drive pin 2 is at the position f, the end 2a of the drive pin 2 is moved to the inclined surface. It climbs up to position a, falls down at step 1b, and reaches position b. When moving from position a to position b, in the conventional example, there was a risk that the drive pin 2 would move directly to position d without passing through positions a, b, and c, but in this embodiment, the drive pin 2 Since it is urged in the direction of arrow D by the spring 13, it reaches position b from position a without directly moving to position d. After that, as in the conventional case, the slider 1 is locked at position c, and then falls down sequentially through the steps 1c, 1d, and 1e, passes through positions d and e, and returns to position f, and the slider 1 returns to its original position. will return to. As the slider 1 moves, the movable contact 14 changes to the fixed contact 16.
The contact position with respect to the three fixed contacts 16 changes by sliding, and the switch operates as a switch.

Even if a push switch using such a single-acting mechanism is made thin, the contact between the leaf spring 13 and the drive pin 2 is always in a point or line contact state, so the leaf spring 13 remains at a substantially constant position. Since the stress is not applied to the root as in the conventional case, the plate spring 3 does not become sagging after a short period of use as in the case of the conventional plate spring 3. In addition, since the contact portion of the leaf spring 13 with the drive pin 2 has a certain degree of freedom, the tolerance value when arranging the leaf spring 13 becomes large, and the leaf spring 13 can be arranged without requiring high accuracy. That will happen. Furthermore, this leaf spring 13 has simply changed its direction compared to the conventional one,
The structure is extremely simple.

As explained above, according to this idea,
By arranging the leaf spring substantially perpendicular to the direction in which the drive pin is arranged, the leaf spring can be easily arranged even if the push switch or the like is made thin.
Durability can be improved without causing flattening of the leaf spring. In addition, by urging the drive pin from a predetermined position toward the advancing side with a leaf spring, it is possible to reliably lock the pin without being locked, which is a useful effect in practical terms. demonstrate.

[Brief explanation of the drawing]

Figures 1 to 3 are diagrams showing the single-acting mechanism of a conventional switch. Figure 1 is a perspective view of the main parts of the single-acting mechanism, Figure 2 is a plan view of the main parts, and Figure 3 is a diagram showing the single-acting mechanism of a conventional switch. The main part side views and Figs. 4 to 9 are views showing the single-acting operating mechanism of a switch according to an embodiment of this invention, and Fig. 4 shows the main parts similar to Fig. 1 showing the same single-acting operating mechanism. A perspective view, FIG. 5 is a plan view of the main parts similar to FIG. 2, FIG. 6 is a longitudinal cross-sectional view of the push switch using the same single-acting mechanism, and FIG. 7 is a cross-sectional view of the push switch.
FIG. 8 is a perspective view showing the leaf spring, and FIG. 9 is a side view of the main parts similar to FIG. 3. 1...Slider, 1a...Heart-shaped cam groove, 2
... Drive pin, 2a ... End, 13 ... Leaf spring.

Claims (1)

[Scope of utility model registration request] A heart-shaped cam groove is formed in the slider cam, a stepped portion for preventing return is formed on the bottom surface of the heart-side cam groove, and an end portion of a drive pin disposed along the moving direction of the slider is formed on the bottom surface. When the slider is moved in a predetermined direction by the biasing force of the leaf spring, the driving pin passes through the advancing side of the heart-shaped cam groove and is locked in a predetermined position, causing the slider to move to a predetermined position. When the slider is locked at the moving position and the slider is moved in the same direction again, the driving pin is pulled out from the predetermined position, the slider is unlocked, and the slider is moved back through the return side of the heart-shaped cam groove. In the single-acting mechanism, the leaf spring is arranged substantially perpendicular to the direction in which the drive pin is arranged, and the leaf spring is arranged such that a component force is applied toward the advancing side from the predetermined position. A single-acting mechanism for a switch, characterized in that the switch is brought into contact with the drive pin at an angle.