JPH0422488Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a slide switch in which a slider equipped with a pair of movable contacts slides while being guided by the inner wall surface of a case. Relating to reduced dynamic resistance.

[Prior Art] FIG. 6 shows an example of a slide switch. This switch is provided with a pair of movable contacts b corresponding to a pair of fixed contacts a on a slider c.
A pair of upper and lower guides d ₁ and d ₂ are formed protruding from both sides of the case e, and the guides d ₁ and d ₂ are slidably guided on the inner wall surface of the case e. The slider c is urged upward in the figure by a coil spring f, and is pushed in from the opposite side by a rod g. When each fixed contact a and movable contact b come into contact with each other, the switch is turned on, and when they separate, the switch is turned off.

[Problems to be solved by the invention] By the way, when moving the slider c upward from the switch-off state where the slider c is pushed into the case e, if the rod g tilts in the left-right direction, the slider c
As a result, the left and right movable contacts b do not connect to the corresponding fixed contacts a at the same time, and one of the movable contacts b contacts the corresponding fixed contact a first. FIG. 6 shows this state, where the movable contact b on the right side of the figure contacts the fixed contact a first,
The left movable contact b is still far away. In this state, the fixed contact a and the movable contact b that are in contact are temporarily welded and fixed, so the slider c is rotated clockwise around the contact point h between them by the force of the coil spring f. , the guide d ₁ on the left side of the figure contacts the inner wall surface of the case e at a point i. this guide
Since the rotation locus j of d ₁ intersects with the inner wall surface of the case e, the guide d ₁ is further pressed against the inner wall surface of the case as the slider c rotates, and the sliding resistance of the guide d ₁ further increases. .

Therefore, an object of the present invention is to provide a slide switch that can prevent the occurrence of such sliding resistance.

[Means for Solving the Problems] The slide switch of the present invention has a pair of fixed contacts attached to an opening at one end of a cylindrical case, and a pair of movable contacts corresponding to the fixed contacts. It consists of a slider that is housed inside and moves while slidingly contacting the inner wall surface, a spring that presses and urges the slider in the direction of contact connection, and a pressing member that can push the slider against this spring. The present invention is characterized in that a guide that protrudes toward the fixed contact beyond a line connecting the vertices of the pair of movable contacts is provided upright at a portion of the slider that slides into contact with the inner wall surface of the case.

[Operation of the invention] When one of the movable contacts contacts the corresponding fixed contact while the slider is tilted, the other movable contact side of the slider rotates around the point of contact between the two due to the elasticity of the spring. . At this time, the guide of the slider contacts the inner wall of the case at a position above the line connecting the vertices of each movable contact, so this contact point moves away from the inner wall of the case as the slider rotates. Move to. Therefore, the other movable contact also quickly comes into contact with the remaining fixed contact.

[Embodiment] An embodiment of the present invention is shown in FIGS. 1 to 4.
This embodiment relates to a brake switch for an automobile, and the brake switch, whose vertical cross section is shown in FIG. 1, is mounted so as to be operated by a brake arm B having a brake pedal A attached to one end thereof. This brake switch includes a case 10, a slider 20 sliding inside the case 10, and an actuator rod 30 for moving the slider forward and backward.
It also includes a return spring 40 that presses the slider 20 in one direction (upward in the figure).

The case 10 has a cylindrical shape with a bottom, and has a pair of fixed contacts 1 attached via a terminal 11 and a conductive member 12.
3 at the upper opening.

Further, as shown in FIG. 2, a space with a cross-shaped cross section extending in the axial direction is formed inside the case 10, and the inner wall surface of the case 10 forming the four corners is used for the slider described later. They are a rotation restriction guide surface 14 and a tilt restriction guide surface 15. Note that FIG. 2 is shown with the conductive member 12 and fixed contact 13 removed.

A space is formed between a pair of opposing rotation regulating guide surfaces 14, and a sliding contact plate 16 is provided between a pair of opposing tilt regulating guide surfaces 15 on the slider 2.
It is inserted parallel to 0. On the other hand, a boss 17 is provided at the center of the bottom of the case 10 to protrude upward.

The slider 20 includes a substantially rectangular contact plate 22 with a pair of movable contacts 21 attached to its upper end, and a contact plate 22 that has a substantially rectangular shape.
A plastic body 24 integrally formed with a pair of guides 23 facing each other across the long sides and extending upward, a sliding contact plate 25 having sliding contacts capable of contacting the sliding contact plate 16, and a lower part. A bottomed cylindrical retainer 26 that opens toward the rivet 27
It is integrated by.

On the other hand, the pair of guides 23 erected on the sides of the body 24 have rounded side surfaces at their upper ends, so that they can come into contact with the tilting restriction guide surface 15. The portion of this guide 23 that comes into contact with the tilting restriction guide surface 15 is located above the line L connecting the tops of the movable contacts 21 (see FIG. 4), that is, on the side of the fixed contact 13. . Further, one end of a coiled return spring 40 is accommodated in the retainer 26, and the other end is attached around the boss 17. As a result, slider 2
0 is biased toward the fixed contact 13.

On the other hand, actuator rod 30 is case 10.
It is housed in a cylindrical holder 31 connected to a metal cover 18 provided on the outside of the brake arm B, and can slide within the holder 31 as the brake arm B rotates. Note that one end of the actuator rod 30 is attached to the rivet 2 of the slider 20.
It is designed to come into contact with the head of No. 7. moreover,
The upper end of the actuator rod 30 in Fig. 1 is in contact with the brake arm B, and although it is not clear in the figure, the end of the actuator rod 30 opposite to the end where the brake pedal A is attached rotates toward the vehicle body. It is movably supported and moves in an arcuate trajectory upwards in the figure. Therefore, a gap is provided in the holder 31 so that the actuator rod 30 can be tilted slightly as the brake arm B moves. Furthermore, Figure 1 shows the actuator rod 30.
The upper end of is shown tilting counterclockwise.

FIG. 3 is a developed view for explaining the attachment of the slider 20 and the case 10. First, conductive member 1
2 (fixed contact 13 attachment part) is not bent, the tip part 24a of the body 24, which protrudes in the left-right direction and has the movable contact 21 attached thereto, is formed between a pair of opposing rotation regulating guide surfaces 14. By fitting into the space, the slider 20 is fitted into the case 1.
Fits within 0. In addition, by bending the tip of the conductive member 12, the fixed contact 13 faces the movable contact 21, and the slider 20 is housed in the case 10 so as not to slip out.

Next, the operation of this embodiment will be explained. FIG. 4 is a diagram schematically showing only the case 10 and the slider 20, and shows the state immediately before the switch is turned on. That is, as shown in FIG. 1, when the brake arm B moves clockwise in the figure, the actuator rod 30 is moved upward by the spring force of the return spring 40 while being tilted.
As a result, the slider 20 is also pushed up while tilting left and right in accordance with the tilt of the actuator rod 30, so that, for example, as shown in FIG. Contact. At this time, the fixed contact 13 on the left side of the figure
A slight gap G is formed between the movable contact 21 and the guide 23 of the slider 20.
It contacts the tilting restriction guide surface 15 at point Q. In this state, the slider 20 attempts to rotate clockwise around the contact point P due to the spring force of the return spring 40, so the movable contact 21 on the side of the gap G makes an arcuate movement and also moves on the opposite side. The user attempts to approach the fixed contact 13 of

Then, since the point Q is located at the same position as the line L or slightly above the line L, when the slider 20 makes an arc movement centered on the point P, the guide 23 tries to draw a trajectory as shown by R. This trajectory R is such that as the slider 20 rotates with the tilting restriction guide surface 15 as a tangent, the point Q moves away from this surface. Therefore, the slider 20 easily rotates around the point P, and the left movable contact 21 similarly contacts the left fixed contact 13 to turn on the switch. At this time, the guide 23
The contact between the case 10 and the tilting restriction guide surface 15 is such that almost no sliding resistance is generated. Therefore, the slider 20 moves smoothly and the switch can be opened and closed quickly.

Note that FIG. 4 shows a case where the slider 20 is tilted toward the left side, but if it is tilted toward the right side, the guide 23 comes into contact with the tilting restriction guide surface 15 near the contact point P. Since the slider 20 rotates clockwise using this contact portion as a fulcrum, the movable contact 21 is once separated from the contact point P, and the left movable contact 21 contacts the fixed contact 13 first. As a result, the slider 20 rotates counterclockwise again using this new contact point as a fulcrum, and the remaining contacts that have once separated come into contact again.

Further, by chamfering the side surface of the guide 23, it is always in point contact with the tilting restriction guide surface 15, which is advantageous in reducing noise during sliding.

FIG. 5 shows another embodiment, in which the same functional parts as in the previous embodiment are denoted by the same reference numerals. A pair of movable contacts 21 are provided, and the tip thereof is further bent downward to form a bent portion 24c. Moreover, a pair of guides 23 are bent and formed in the central part of the long sides so as to open and stand upright. This is advantageous because both the contact plate and the guide can be integrally formed with one metal plate.

[Effects of the invention] In the slider guide according to the invention, the point of contact with the guide surface of the case is located closer to the fixed contact than the line connecting the vertices of the pair of movable contacts. Therefore, even if one of the movable contacts comes into contact with the fixed contact first while the slider is tilted, the trajectory of the contact point between the guide and the case will move away from the inner wall of the case as the slider rotates. , the rotation of the slider is not hindered, and therefore the sliding resistance of the switch can be reduced.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention,
Figure 1 is a longitudinal sectional view, Figure 2 is a top view of the main parts, Figure 3
The figure is a developed perspective view of the main part, and FIG. 4 is a sectional view of the main part. FIG. 5 is a perspective view of main parts showing another embodiment. FIG. 6 is a schematic sectional view showing the prior art. Explanation of symbols, 10... Case, 13... Fixed contact, 15... Tilt regulation guide surface, 20... Slider, 21... Movable contact, 23... Guide, 30...
...actuator rod, 40...return spring.

Claims (1)

[Scope of utility model registration request] a slider which is provided with a pair of fixed contacts attached to an opening at one end of a cylindrical case and a pair of movable contacts corresponding to the fixed contacts, and which is housed in the case and moves while slidingly contacting the inner wall surface thereof; In a slide switch consisting of a spring that presses and biases the slider in the direction of contact connection, and a pressing member that can push the slider against the spring, when the slide switch crosses the line connecting the vertices of the pair of movable contacts. A slide switch characterized in that a guide protruding toward the fixed contact side is provided upright at a portion of the slider that makes sliding contact with the inner wall surface of the case.