JPS6343708Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a changeover switch.

Conventionally, in this type of switch, a switch actuator is inserted into a switch case so as to be able to reciprocate, and the forward and backward end faces of the switch actuator are brought into contact with the opposing inner wall surfaces of the switch case. There is a device that restricts the forward and backward movement limits of the switch actuator by making contact with the switch actuator, but in this case, when the switch actuator comes into contact with each inner wall surface of the switch case, impact noise is generated , there is a problem that it gives a feeling of discomfort.

An object of the present invention is to provide a changeover switch with a simple structure, which can prevent the impact noise from occurring by using an elastic buffer member, and has increased durability of the elastic buffer member. .

In order to achieve the above object, the present invention includes a boss that projects from the inner wall surface toward the switch actuator side at the middle part of the inner wall surface of the switch case along the reciprocating direction of the switch actuator. An elastic shock absorbing member having a substantially U-shaped cross section is attached to the boss to cover the outer circumferential surface and end surface of the tip of the boss, and the elastic shock absorbing member is installed on the boss, and the elastic shock absorbing member has a cover portion having a substantially U-shaped cross section to cover the outer circumferential surface and end surface of the tip of the boss. The present invention is characterized in that a pair of protrusions that abut against the outer peripheral surface of the tip end of the boss with the cover portion in between are fixed to the switch actuator at a distance from each other in the reciprocating direction thereof.

An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a rectangular switch case, which is composed of a case body 2 and a fixed contact holding plate 3 fitted into an opening of the case body 2. As shown in FIG. 4, the fixed contact holding plate 3 has two engaging claws 4 on each long side and one positioning protrusion 5 on the short side, and the positioning protrusion 5 is attached to the case body. 2 to position the fixed contact holding plate 3, and each engaging claw 4 is removably fitted into each engaging hole 7 of the case body 2 to prevent the fixed contact holding plate 3 from coming off. It's stopping me.

A pair of protrusions 8 (only one shown in the figure) is formed on both longitudinal sides of the inner wall surface of the case body 2 facing the fixed contact holding plate 3, and between each protrusion 8 and the fixed contact holding plate 3. A switch actuator 9 is inserted so as to be able to reciprocate in the left-right direction in the figure. A switching operation knob 13 having a cover 12 is integrally formed on the switch operator 9 via a connecting rod 11 that projects outside from a notch 10 in the case body 2 . The cover 12 is for concealing the switch case 1 when it is attached to a device.

Further, the switch actuator 9 is integrally formed with a protrusion 14 that guides its reciprocating motion, and the protrusion 14 is fitted into the notch groove 6 of the case body 2.

As shown in FIG. 2, there is a space between the inner wall surface of the case body 2, which faces the fixed contact holding plate 3 and is parallel to the reciprocating direction of the switch actuator 9, and the switch actuator 9, which is opposite to the inner wall surface of the case body 2. A click stop mechanism 18 is interposed to hold the child 9 in a neutral position. The mechanism 18 consists of a steel ball 15, a spring 16 that springs it, and a groove 17 that engages with the steel ball 15. Both sides of the groove 17 have gentle downward slopes 19, 20.
is formed.

On the side opposite to the click stop mechanism 18, first to third movable contacts 21 to 23 are attached to the switch actuator 9, and each of the movable contacts 21 to 23
is a U-shaped contact piece 24 and a spring 2 that springs it.
It consists of 5 and more.

Each pair of first to fourth fixed contacts 26, 26' to 29, 29' are attached to the fixed contact holding plate 3. Connecting pieces 31 to lead wires are fixed to the first to fourth fixed contacts 26 to 29 on one side, and between the first and second fixed contacts 26' and 27' on the other hand, and between the third and fourth fixed contacts 28 ', 29' are connected by connecting plates 3, respectively.
2 and 33. Therefore, first,
The second movable contacts 21 and 22 are the first and second fixed contacts 2
6, 26' and 27, 27', the first circuit is closed, while the second and third movable contacts 22, 23
are the third and fourth fixed contacts 28, 28' and 29,
Contacting 29' closes the second circuit.

As shown in FIG. 3, the click stop mechanism 1
A single boss 35 having a stepped through hole 34 is integrally provided at approximately the center of the inner wall surface of the case body 2 on the 8 side and protrudes toward the switch actuator 9 side. this boss 3
An elastic buffer member 36 having a cap-shaped cover portion 37 having a substantially U-shaped cross section and covering the outer circumferential surface and end surface of the tip end of the boss 35 is attached to the boss 35 . That is, the boss 3 is provided on the lower surface of the cover portion 37 of the elastic buffer member 36.
A mounting rod 38 that is tightly fitted into the through hole 34 of No. 5 is integrally protruded, and an enlarged portion 39 at the tip of the mounting rod 38 is locked to the stepped portion of the through hole 34 to prevent it from coming off. At the tip of the enlarged part 39, there is a rod 3 that is initially attached.
8 into the through hole 34.
0 is provided protrudingly, but the knob portion 40 is removed after the mounting rod 38 is inserted into the through hole 34.

A pair of protrusions 41 and 42 are protruded from the surface of the switch actuator 9 facing the elastic buffer member 36 on both sides with the elastic buffer member 36 as a boundary. When moving forward in the direction a, just before reaching the forward movement limit where the end face 43 in the forward movement direction comes into contact with the inner wall surface 44 of the case main body opposite thereto, the protrusion 42 pinches the cover portion 37 of the elastic buffer member 36 and presses the boss. It is set so as to abut against the outer circumferential surface of the tip portion of 35. This protrusion 42
7, the first and second movable contacts 21 and 22 and the first and second fixed contacts 26 and 26' and 27 and 2
7' are determined, and each contact point 21, 26, 2
The state of contact between 6' and 22 and 27, 27' is such that the steel ball 15 of the click stop mechanism 18 is on one slope 19.
It is held by moving up. The position of the other protrusion 41 is such that when the switch actuator 9 moves backward from the neutral position in the direction of arrow b, opposite to the above, the end surface 45 in the backward movement direction comes into contact with the inner wall surface 46 of the case main body facing thereto. Immediately before reaching the limit of movement, the protrusion 41 pinches the cover portion 37 of the elastic buffer member 36 and presses the boss 35.
It is set so that it abuts against the outer circumferential surface of the tip. The second and third movable contacts 22 and 23 and the third and fourth fixed contacts 28 and 2
8' and 29, 29' are determined, and the contact state of each contact point 22 and 28, 28' and 23 and 29, 29' is determined by the steel ball 15 of the click stop mechanism 18.
is held by moving onto the other slope 20.

The switch actuator 9 is provided with one protrusion 47 located outside the intermediate protrusion 41,
Each protrusion 41, 42, 47 slides on each protrusion 8 on the inner wall surface of the case body 2.

As described above, according to the present invention, a switch actuator is inserted into a switch case so as to be able to freely reciprocate, and the forward and backward end faces of the switch actuator are connected to each other in the switch case opposite to each other. In the changeover switch, which is brought into contact with an inner wall surface to restrict the forward and backward movement limits of the switch actuator, the switch is provided at an intermediate portion of the inner wall surface of the switch case along the reciprocating direction of the switch actuator. ,
A boss is integrally provided that projects from the inner wall surface toward the switch actuator, and the boss is provided with an elastic buffer member having a cover portion having a substantially U-shaped cross section that covers the outer circumferential surface and end surface of the tip end of the boss. A pair of protrusions that abut against the outer peripheral surface of the tip end of the boss across the cover portion are attached to the switch actuator in its reciprocating direction just before the switch actuator reaches its forward and backward movement limits. When the switch actuator moves back and forth, the protrusion is brought into contact with the cover of the elastic buffer member just before it comes into contact with the inner wall surface of the switch case, and the switch actuator is fixed at a certain distance from the other. The moving speed can be reduced, so even if the switch operating element directly contacts the inner wall surface of the switch case, the contact is weak and the generation of impact noise is suppressed. Moreover, even when the switch actuator reaches either the forward movement limit or the backward movement limit, the above-mentioned buffering effect can be effectively exerted by the cover portion of the single common elastic buffer member attached to the boss. Because of this, compared to a structure in which an elastic buffer member is wrapped around the entire circumference of the switch actuator, or a structure in which two elastic buffer members are individually provided at both ends of the switch actuator,
The number of elastic shock absorbing members used can be reduced, and the size of the elastic shock absorbing members can be reduced, contributing to cost reduction.

In particular, the cover portion of the elastic buffer member is formed in a substantially U-shaped cross section to cover the outer circumferential surface and end surface of the tip end of the boss, and each of the protrusions hits the outer circumferential surface of the tip end of the boss with the cover portion in between. As a result, the force that the cover part receives from each protrusion at the time of the collision can be stably received by the outer circumferential surface of the tip end of the boss. There is no risk of an excessive load being applied to the cover section, and therefore, the contact between both end surfaces of the switch actuator and the inner wall surface of the switch case reliably prevents excessive elastic deformation of the cover section itself. Together with this, this can greatly contribute to improving the durability of the elastic shock absorbing member.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a side view, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG.
The figure is a sectional view taken along the line of FIG. 1, and FIG. 4 is a view taken from FIG. 2. DESCRIPTION OF SYMBOLS 1...Switch case, 9...Switch operator, 35...Boss, 36...Elastic buffer member, 37
...Cover portion, 41, 42...Protrusion, 43...Forward movement direction end face, 44, 46...Switch case inner wall surface, 45...Return movement direction end face.

Claims (1)

[Scope of utility model registration request] The switch actuator 9 is inserted into the switch case 1 so as to be able to reciprocate, and the forward movement end face 43 and the backward movement end face 45 of the switch actuation member 9 are connected to the inner wall surfaces 44 of the switch case 1 facing them,
46 to restrict the forward and backward movement limits of the switch actuator 9, the inner wall surface of the switch case 1 along the reciprocating direction of the switch actuator 9 A boss 35 that protrudes from the inner wall surface toward the switch actuator 9 is integrally provided in the section, and this boss 35
An elastic buffer member 36 having a cover portion 37 having a substantially U-shaped cross section is attached to cover the outer circumferential surface and end surface of the tip of the boss 35, and immediately before the switch actuator 9 reaches its forward and backward limits, A pair of protrusions 41 and 42 that abut against the outer circumferential surface of the tip end of the boss 35 with the cover portion 37 in between are fixed to the switch actuator 9 at a distance from each other in the reciprocating direction thereof. Features a changeover switch.