JPH0646039Y2 - Push switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is directed to a push switch configured to regulate a pushing position and a returning position of a slider by a positioning mechanism having a so-called heart-shaped cam, and more specifically, the positioning mechanism. The present invention relates to a push switch that facilitates assembly work by integrating a hook rod and a spring member.

[Conventional technology]

In a push switch in which a slider housed in a switch case is moved between a pushing position and a returning position to switch the conduction state of a contact piece, the pushing position and the returning position of the slider are regulated by a positioning mechanism described below. It

That is, the positioning mechanism includes a heart-shaped cam provided on the slider, a spring for constantly elastically urging the slider in, for example, the returning direction, and a U-shaped hook whose tip portion follows the cam groove of the heart-shaped cam. The rod includes a rod and a spring member that elastically biases the hook rod toward the slider. When the slider is repeatedly pushed against the bias of the spring, the engagement portion of the heart-shaped cam is alternately switched between a state where it engages with the tip of the hook rod and a state where it disengages from the tip of the hook rod. When both are engaged, the slider is held at the pushing position against the bias of the spring, while when both are disengaged, the slider is returned to the return position by the bias of the spring.

In such a push switch, the spring member is necessary to make sure that the tip of the hook rod always follows the cam groove of the heart-shaped cam, but the hook rod and the spring member are separately attached to the switch case. This is not preferable in terms of workability.

Therefore, conventionally, a hook rod is attached to a spring member in advance and is assembled to a switch case to reduce the number of steps for assembling a push switch and improve workability.

FIG. 9 shows a conventional example in which the hook rod 100 is attached to the spring member 200. This is a plate-shaped spring member 200
U-shaped hook bar 100 in the support hole 210 opened at one end of
The base end portion 110 of the spring member 200 is inserted to be rotatable, and the distal end portion of the hook rod 100 is inserted into the horizontally elongated opening 220 formed at the other end portion of the spring member 200.
While the 120 is inserted, the tip portion 231 of the folded piece 230 formed at one end of the spring member 200 presses the middle portion of the hook rod 100.

FIG. 10 shows another conventional example. The spring member 200 includes a rising portion 240, a supporting piece 250 horizontally protruding from one end of the rising portion 240, a protruding piece 260 horizontally protruding from the other end of the rising portion 240, and a protruding piece 260 from the above. The pressing piece 270 extending toward the supporting piece 250 is integrally formed, and the supporting piece 2
The base end of the U-shaped hook bar 100 in the support hole 280 opened in 50.
110 is inserted to be rotatable, and the tip portion 27 of the pressing piece 270 is
The configuration is such that 1 presses the middle portion of the hook rod 100.

[Problems to be solved by the invention]

However, in the case of FIG. 9, after bending the folding piece 230 after inserting the base end portion 110 of the hook rod 100 into the support hole 210, the springback phenomenon of the folding piece 230 can be prevented. Accordingly, it is difficult to elastically press the hook rod 100 on the spring member 200 at the tip portion 231 of the folded piece 230. Therefore, conventionally, the switch case is provided with a portion for pressing the folding piece 230, but there is a problem that the dimensional accuracy of the switch case and the spring member 200 is required to be high because of the configuration.

According to the one shown in FIG. 10, the base end portion 110 of the hook rod 100 is provided with the support hole 280 at the side position of the pressing piece 270 as shown by the phantom line in the figure.
Then, the hook rod 100 is rotated around its base end portion 110 as shown by an arrow A by inserting the hook rod 100 into the hook rod 100.
The hook rod 100 into the spring member.
Fixed at 200. Therefore, press piece 270 to hook bar 100
Bending can be done prior to mounting, and the problems associated with the springback phenomenon described above can be solved. However, in the structure shown in FIG. 10, a gap S is formed between one side of the tip end portion 271 of the pressing piece 270 and the supporting portion 250 in order to easily push the hook rod 100 under the pressing piece 270. After that, the hook rod 100 is always pushed by the tip portion 271 of the pressing piece 270 in the direction of coming out of the gap S. Therefore, there is a problem that the tip portion 120 of the hook rod 100 is likely to malfunction when it swings left and right following the cam groove of the heart-shaped cam described above.

Further, in any of FIGS. 9 and 10, it is necessary to insert the base end portion 110 of the hook rod 100 into the support holes 210 and 280 from above. However, in the case of a small push switch used for electronic devices, etc., the support holes 210,280
Is very small and the hook bar 100 is too small to be handled with tweezers, so the support holes 210,280
The work of inserting the base end portion 110 of the hook rod 100 into the above requires careful attention and skill. This makes it difficult to automate the insertion work.

This invention solves the problems described above, and solves the problems associated with the springback phenomenon by configuring the base end portion of the hook bar to be inserted into the support hole after bending the folded piece, and at the same time, By facilitating the insertion of the base end of the hook rod into the support hole, the insertion work can be automated easily. Furthermore, the hook rod malfunctions when it swings following the cam groove of the heart-shaped cam. An object of the present invention is to provide a push switch that does not cause

Another object of the present invention is to make the hook bar attached to the spring member less wobbling when the hook bar and the spring member are handled as a unit, so that such a bar is used as a standard component. It is an object of the present invention to provide a push switch that can be used as a common component for various types of push switches, and that when the push switch is assembled, the step of fitting the slider into the switch case and storing it can be performed easily and with good workability. To do.

[Means for solving problems]

Means taken to achieve the above object is such that a slider having a movable contact piece is fitted into a switch case having a fixed contact piece to be housed therein, and is opened at one end of a spring member attached to the switch case. The base end portion of the U-shaped hook rod is rotatably inserted into the support hole, and the middle portion of the hook rod is elastically pressed against the spring member by the tip portion of the folded piece provided at the other end portion of the spring member. Further, in the state where the tip of the hook rod is introduced into the cam groove of the heart-shaped cam provided on the slider while the slider is fitted in the switch case, and the slider is housed in the switch case. In the push switch adapted to follow the cam groove, one end of the spring member has a groove width dimension smaller than the diameter of the base end of the hook rod,
Further, a notch-shaped guide groove portion that allows passage of the base end portion of the hook rod by elastic deformation is formed in a state of communicating with the support hole, and an opening is opened at the other end portion of the spring member,
This means that the tip of the hook bar is loosely inserted into this opening in a state where the hook bar is allowed to swing right and left.

[Action]

According to the push switch having such a configuration, the base end portion of the hook rod inserted into the support hole is prevented from coming out of the support hole by the guide groove portion, and the tip end portion of the hook rod is securely in the cam groove of the heart-shaped cam. It is imitated and swings left and right. When the base end portion of the hook rod is pushed into the guide groove portion, the guide groove portion is elastically deformed accordingly and the base end portion of the hook rod is allowed to pass, and when the base end portion of the guide rod fits into the support hole. The guide groove part returns to the original state. Further, the hook rod is pushed under the folding piece simply by fitting the base end portion of the hook rod into the support hole, and the hook rod is elastically pressed by the spring piece by the folding piece.

Further, in the push switch having the above configuration, the hook rod having the base end portion inserted into the support hole on the one end side of the spring member is
Since the intermediate portion thereof is elastically pressed by the spring member at the tip end of the folded piece provided at the other end of the spring member, the hook bar is held in a state in which wobbling does not easily occur with respect to the spring member. It becomes easy to handle the spring member and the hook rod provided with the piece as an integrated body, which makes it possible to use the integrated body of the spring member and the hook rod as a standard component and a common component for other types of push switches. It will be possible.

Further, in such an integrated body of the spring member and the hook rod, the tip end portion of the hook rod is loosely inserted into the opening formed at the other end of the spring member in a state in which left and right swing is allowed. Therefore, the left and right swing width of the tip portion of the hook bar is regulated within a certain angle range by the opening of the spring member. Therefore, while the slider is being fitted in the switch case, the tip of the hook rod is introduced into the cam groove of the heart-shaped cam provided in the slider, and the slider is housed in the switch case. In the push switch targeted by the present invention, which is adapted to the above, the tip of the hook rod is reliably introduced into the cam groove when the slider is fitted in the switch case. Here, if the hook bar is held in a wobbling state easily or there is no restriction on the swing width of the tip of the hook bar,
When the slider is fitted into the switch case, the tip of the hook bar may be wobbled or shaken greatly to the left or right, which is an obstacle to the work for fitting the slider.

[Embodiment] FIG. 1 is an exploded perspective view of a push switch according to an embodiment of the present invention. In the figure, reference numeral 1 is a switch case made of a box-shaped resin molded product, and a plurality of, for example, a set of three fixed contact pieces 3, ... There is. These fixed contact pieces 3 ..., 3 ... Are integrally provided with terminals 4, ..., 4 ... Projected from the back surface of the switch case 1, and are provided in the switch case 1 by insert molding. The internal space of the switch case 1 is divided into a slider accommodating space 6 and a spring member accommodating space 7 by the left and right ridges 5, 5 provided on the inner surface of the side wall of the switch case.

Reference numeral 8 is a slider, and a functional portion 10 having a heart-shaped cam 9
The movable contact piece holding portions 11 and 11 and the operation portion 12 into which an operation button (not shown) and the like are fitted are provided. The heart-shaped cam 9
Heart-shaped engaging part 13, cam groove 14 and guide part 15 around it
And the cam groove 14 extends to the end of the functional portion 10. Reference numeral 16 is a movable contact piece formed by bending a metal plate having a spring property into a clip shape as illustrated. The movable contact pieces 16 are held by the movable contact piece holding portions 11, 11 one by one. The movable contact pieces 16 and 16 held by the movable contact piece holding portions 11 and 11 are arranged in sets of three when the slider 8 is slid in the slider accommodating space 6.
The fixed contact pieces 3, 3 at the central portion of the ... And the fixed contact pieces 3, 3 located at either one of the front and rear sides of the fixed contact piece are selectively electrically connected.

Reference numeral 17 is a spring member formed by bending a thin metal plate having spring properties. As shown in detail in FIG. 2, a support hole 19 is provided at one end of the spring member 17, and a notch-shaped guide groove portion 20 communicating with the support hole 19 is formed. In the illustrated example, the support hole 19 and the guide groove portion 20 are formed in the hook-shaped projecting piece 18. At the other end of the spring member 17, a rising piece 21, a folding piece 22 extending from the center of the rising piece 21, and an opening 23 are provided. Folding piece 22
Has an inclined portion 22a having a relatively gentle inclination angle, and the tip portion 22b of the inclined portion 22a is bent obliquely upward. In the natural state shown by the phantom line in FIG.
Is in contact with the support portion 24 of the spring member 17 or faces the support portion 23 with a gap smaller than the diameter dimension of the hook bar 25 described later. The hook rod 25 is formed in a U shape, the base end portion 26 of which is inserted into the support hole 19 so as to be rotatable, the tip end portion 27 of which is inserted into the opening 23, and the middle portion of which is the folded piece. 22 tip 22b and support 2
Held by 4 and. Folded piece 22 as described
In the natural state, the bent portion 22c of the tip portion 22b of the
Since it is in contact with the support portion 24 of 17 or is opposed to the support portion 24 with a gap smaller than the diameter dimension of the hook rod 25, it can be inferred from FIG.
The intermediate portion of the hook is elastically pressed by the support portion 24 by the tip 22b of the folded piece 22, but the elastic force is the hook rod.
25 is set so that it can freely slide left and right around its base end portion 26, and the hook rod 25 is not easily separated from the spring member 17. The groove width dimension L of the guide groove portion 20 shown in FIG. 3 is slightly smaller than the diameter D of the base end portion 26 of the hook rod 25. Therefore, the base end portion 26 of the hook rod 25 inserted in the support hole 19 does not come out through the guide groove portion 20. The guide groove portion 20 is provided with an outwardly extending intake groove portion 20a.

In FIG. 1, reference numeral 30 denotes a cover, which is an operation portion 12 of the slide 8.
An opening 31 through which a plurality of claws 32 are inserted, and a plurality of engaging portions 33, etc. corresponding to a plurality of claw portions 32 (only one is shown in FIG. 1) protruding from the outer surface of the switch case 1. I have it. 34 indicates a coil spring.

Next, an example of a procedure for attaching the hook rod 25 to the spring member 17 and an operation in the attached state will be described. After inserting the tip portion 27 of the hook rod 25 into the opening 23 of the spring member 17, the hook rod 25
The base end portion 26 of the guide groove portion 20 is pushed into the guide groove portion 20 from the introduction groove portion 20a as shown by an arrow X in FIGS.
While 0 is elastically deformed against its springiness, its base end 2
Insert 6 into support hole 19. By doing so, after the base end portion 26 of the hook rod 25 is inserted into the support hole 19, the guide groove portion 20 is restored to its original state by its spring property, and the base end portion 26 is supported.
Prevent you from leaving. Further, at the time of pushing in, the intermediate portion of the hook bar 25 gradually bites under the inclined portion 22a of the folding piece 22 as can be inferred from the position shown by the phantom line in FIG. 22 of 22
Even if the b or the bent portion 22c is not artificially lifted or one side of the tip end portion 22b is lifted from the support portion 24 unlike the conventional case, the base end portion 26 is simply inserted into the support hole 19 to hook. The middle portion of the rod 25 is the tip portion 22b of the folded piece 22 and the support portion 24.
The hook rod 25 is clamped by and the middle portion of the hook rod 25 is elastically pressed by the tip portion 22b of the folded piece 22 in the direction perpendicular to the support portion 24.
Further, since the folded-back piece 22 has its base end portion extended to the rising portion 21 provided over the entire width of the other end portion of the spring member 17, as compared with the conventional one described in FIG. 10, When the springs have the same spring property, the intermediate portion of the hook rod 25 can be elastically pressed against the support portion 24 by a stronger force. In other words, even if the spring member 17 is made of a metal plate having a thin wall thickness, it is possible to repress the spring member 17 with a force equivalent to that described with reference to FIG.

Next, an example of a procedure for assembling the push switch will be described.

After fitting the spring member 17 with the hook bar 25 fitted into the spring member housing space 7 of the switch case 1, the coil spring 34 and the slider 8 are fitted into the slider housing space 6 of the switch case 1. By the way, in the spring member 17 to which the hook rod 25 is attached, as described above, the middle portion of the hook rod 25 and the tip portion 22b of the folded piece 22 of the spring member 17 and the support portion 2 are provided.
Since the spring member 17 is elastically pressed, the hook rod 25 is held in a state in which the spring rod 17 is less likely to wobble.
Therefore, the spring member 17 and the hook rod 25 are integrated. In such an integrated body, the opening of the spring member 17
Since the tip end portion 27 of the hook rod 25 is loosely inserted into the 23 in a state where the left and right swing is allowed, the swing width of the tip end portion 27 of the hook rod 25 within the fixed angle range is set by the opening 23. Regulated by. As a result, the tip end portion 27 of the hook rod 25 is reliably introduced into the cam groove 14 of the heart-shaped cam 9 provided in the slider 8 while the slider 8 is being fitted into the switch case 1. It does not occur that the slider 8 is difficult to fit in due to the hook rod 25 wobbling or the tip 27 of the hook rod 25 swinging greatly to the left and right. When the slider 8 is fitted into the slider accommodating space 6, the movable contact pieces 16 and 16 held by the slider 8 are fitted to the fixed contact pieces 3 and 3, and the hook rod 25 is inserted into the cam groove 14 of the heart-shaped cam 9.
The tip 27 of the is copied. Next, the engaging portion 33 of the cover 30 ...
The cover 30 closes the opening of the switch case 1 by engaging with the claw portions 32 of the switch case 1.

According to the push switch thus assembled, the coil spring 34 constantly urges the slider 8 in the returning direction. Then, when the slider 8 is pushed against the bias of the coil spring 34 from the return position shown in FIG. 7, the heart-shaped cam 9 moves to move the tip 26 of the hook rod 25 to the left or right. The engaging portion 13 engages with the tip portion 26 as shown in FIG. In this state, the slider 8 is held at the pushing position. Then, when the slider 8 is pushed in again, the engaging portion 13 becomes the tip portion of the hook rod 25.
As a result of being released from 26, the slider 8 is pushed out in the returning direction by the coil spring 34 as the pushing force is released, and the slider 8 returns to the returning position in FIG. 7. Thus, when the slider 8 moves between the pushing position and the returning position, the fixed contact piece is moved.
The conduction state of 3 and 3 is switched.

Here, the tip end portion 26 of the hook rod 25 is swung left and right following the cam groove 14 when the slider 8 is moving between the pushing position and the returning position. At that time, even if the tip portion 26 receives a force in the direction of coming off from the cam groove 14, the hook rod 25 is always pressed by the tip portion 22b of the folding piece 22 to the support portion 24 (see FIG. 2) and comes off. Don't worry.

FIG. 5 shows an inner surface of the switch case 1 having four protrusions 36 ... Forming a cross-shaped groove 35. Further, FIG. 6 shows that by inserting the protruding piece 18 of the spring member 17 housed in the switch case 1 into the horizontal portion of the groove portion 35,
Insert the tip 26 of the hook rod 25 inserted into the support hole 19 into the groove portion.
It shows the state of being fitted in the vertical part of 35. By doing so as shown in FIG. 6, since the tip end portion 26 of the hook rod 25 is sandwiched by the two protrusions 36, 36 on both sides thereof, it is possible to more reliably prevent the tip end portion 26 from coming out of the guide groove portion 20. There is.

[Effect of device]

According to the push switch of the present invention, the base end portion of the hook rod can be inserted into the support hole from the side through the guide groove portion, so that the insertion work is much more difficult than the conventional case of inserting from above the support hole. Not only does it make it easier to automate the insertion work even when the support hole or hook bar is very small, such as a small push switch, but it can also be used after bending the bent piece on the spring member. Since it is possible to push the hook bar under the member, it is possible to solve the problem associated with the spring back of the folding piece. Further, since the hook bar is elastically pressed by the spring member by the tip of the folded piece provided at the other end of the spring member, it becomes difficult for lateral force to act on the hook bar. It becomes difficult for a malfunction to occur when the camera is swung following the.

Further, according to this invention, it becomes easy to handle the spring member and the hook bar as an integrated body in which the hook bar is not easily wobbled, so that the integrated body is used as a standard part for other types of push switches. It becomes possible to use it as a common part. Further, the hook bar is elastically clamped by the support part of the spring member and the tip of the folded piece in a state in which the hook bar is less likely to wobble, and the tip of the hook bar is loosely inserted into the opening of the spring member to regulate the left and right swing range. Therefore, when the slider is fitted in the switch case, the tip of the hook bar is surely introduced into the cam groove on the slider side, which facilitates the work of fitting the slider in the switch case. There is.

[Brief description of drawings]

1 is an exploded perspective view of a push switch according to an embodiment of the present invention, FIG. 2 is a perspective view showing a state where a hook rod is attached to a spring member, and FIG. 3 is a procedure for attaching the hook rod to the spring member. FIG. 4 is a partially cutaway plan view showing a state in which a hook bar is attached to a spring member, FIG. 5 is a partial perspective view showing an internal structure of a switch case, and FIG. 7 and 8 are longitudinal cross-sectional views for explaining the operation of the push switch, and FIG. 9 is a spring member used in a conventional push switch with a hook bar. FIG. 10 is a perspective view showing the attached one, and FIG. 10 is a perspective view showing another example of attaching the hook bar to the spring member used in the conventional push switch. 1 ... Switch case, 3 ... Fixed contact piece, 8 ... Slider, 9
... Heart-shaped cam, 14 ... Cam groove, 16 ... Movable contact piece, 17 ... Spring member, 18 ... Projection piece formed at one end of the spring member, 19 ... Support hole, 20 ... Guide groove section, 22 ... Folding piece, 22b ... Tip of folded piece, 23 ... Opening, 25 ... Hook rod, 26 ... Hook rod proximal end, 27 ... Hook rod distal end, D ... Hook rod proximal end diameter, L ... Guide groove portion Groove width dimension.

Claims (1)

[Scope of utility model registration request] 1. A switch case having a fixed contact piece in which a slider having a movable contact piece is fitted and accommodated, and a U-shaped hook rod is provided in a support hole formed at one end of a spring member mounted to the switch case. Is rotatably inserted, the middle portion of the hook rod is elastically pressed by the spring member at the tip of the folded piece provided at the other end of the spring member, and the hook rod has its tip. Part is introduced into the cam groove of the heart-shaped cam provided on the slider while the slider is fitted in the switch case, and is imitated by the cam groove when the slider is housed in the switch case. In the push switch made as described above, the one end portion of the spring member has a groove width dimension smaller than the diameter of the base end portion of the hook rod, and the base end of the hook rod is elastically deformed. A notch-shaped guide groove portion that allows passage of the portion is formed in a state of communicating with the support hole, an opening is opened at the other end of the spring member, and the tip end of the hook rod is allowed to swing left and right in this opening. A push switch that is loosely inserted in a state.