JPS6215947Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a changeover switch used in testers, other electrical measuring instruments, electronic equipment, and the like.

[Conventional technology]

For example, in testers, it is well known that rotary switches are used to change ratings, etc., and users need to know that the switching operation is reliable, that the switching is smooth and light, and that there is less wear on the contacts. It goes without saying that manufacturers want products to withstand long-term use, and in addition to meeting these conditions, they also want products to be easy to manufacture, assemble, and adjust, and to be low-cost. We are working hard to ensure high reliability. However, conventional changeover switches do not necessarily satisfy these conditions.

FIG. 1 shows an example of a conventional sliding type changeover switch, where A is a longitudinal sectional view of the main part and B is a plan view of the brush. In the figure, 1 is a movable plate that slides in the direction a or b as shown in the figure. Reference numeral 2 denotes a brush made of spring material, and as shown in Figure B, it consists of a base 3 and forked arms 4, 4, which are bent diagonally.
The tips of the arms 4, 4 are bent downward, and a contact portion 5 is formed at the top. The base 3 of this brush 2 is fixed to the movable plate 1 by rivets, screws, etc. 6, and the contact portion 5 is at a position 5a shown by a broken line in a no-load state. 7 is a contact plate, and a plurality of contacts 8 are provided in parallel on the bottom surface by, for example, printed wiring. The contact plate 7 is fixed by lowering the contact portion 5 of the brush 2 to the position shown by the solid line, and presses the arm portions 4, 4 to ensure contact with the contact point 8. For this reason, the contact plate 7 is constantly acted upon by a force that causes the brush 1 to return to its unloaded state, that is, a diagonally upward force F ₁ of the brush 1 as shown in Figure C.

In the changeover switch configured as described above, the movable plate 1 is slid in the direction a or b to switch the contacts. Now, as shown in Figure C, if the movable plate 1 is slid in the direction of arrow a with force _F2 ,
The movable plate 1 slides against the combined force F ₃ of the pressing forces F ₁ and F ₂ of the brush 2. At this time, the angle between the perpendicular line passing through the contact portion 5 and the resultant force F ₃ is defined as θ ₁ .
On the other hand, when an attempt is made to slide the movable plate 1 in the direction of arrow b with a force F ₂ of the same magnitude as above as shown in Fig. D, the resultant force F ₄ acts on the contact plate 7 . Incidentally, the angle θ ₂ between this resultant force F ₄ and the perpendicular line passing through the contact portion 5 is very small, θ ₁ >θ ₂ , and the contact portion 5 of the brush 2 acts to bite into the contact plate 7. It is difficult to slide the movable plate 1.

Therefore, when sliding the movable plate 1 in the b direction, the force F ₂ applied to the movable plate 1 is increased, for example
As F ₂ ′, the magnitude of the resultant force F ₄ and the angle θ ₂ formed with the perpendicular line are the resultant force F ₃ when sliding in the a direction.
must be at least equal to . That is, as shown by the broken line, it is necessary to satisfy F ₂ <F ₂ ′, F ₃ =F ₄ ′, and θ ₁ =θ ₂ ′. For this reason, move the movable plate 1 by arrow b
When sliding in the direction a, a larger force is required than when sliding in the a direction.

[Problem that the invention aims to solve]

In this way, the conventional changeover switch has a movable plate 1
The driving force differs significantly depending on whether the sliding direction is the a direction or the b direction, making smooth switching difficult.
For this reason, the contact portion 5 tends to wear out unevenly, resulting in poor contact, which has the disadvantage that it cannot withstand long-term use. Also,
Since the work of fixing the base 3 of the brush 2 to the movable plate 1 requires precision, it requires a high degree of skill, and the work time is also increased, causing an increase in costs, and there are many problems in manufacturing.

This invention was developed to solve the problems of the conventional changeover switch as described above.It is easy to attach to the movable plate, has low contact resistance when sliding in either direction a, or The power remains the same,
Furthermore, it is an object of the present invention to provide a changeover switch with less wear on the contact portions.

[Means for solving problems]

The present invention was made in order to solve the above problem, and is made of a rectangular spring material, which has a contact part in the center part in the longitudinal direction, and has elongated cut parts in the longitudinal direction leaving both ends. , a brush bent into a chevron shape with the contact portion as the apex, and a width slightly narrower than the width of the cut-out portion of the brush, which is provided parallel to the sliding direction, and is longer than the length of the cut-out portion of the brush in an unloaded state. A movable plate provided with a long protrusion and supporting parts lower than the protrusion close to both sides of the protrusion in the longitudinal direction, and a plurality of contacts arranged at predetermined intervals in the same direction as the sliding direction of the movable plate. and a contact plate provided in parallel, the cutout part of the brush is fitted into the protrusion part of the movable plate so that both ends thereof are supported by a support plate, and the contact plate is disposed on the brush. The present invention provides a changeover switch in which the contact plate is fixed to a case or the like by pressing down the contact portion of the brush.

[Effect]

When the movable plate is slid in one direction, one side of the protrusion comes into contact with one end of the cutout of the brush,
Switch the contacts by sliding the brushes in the same direction. Similarly, by sliding the movable plate in the opposite direction, the contacts on the opposite side can be switched. In this case, the brush is configured symmetrically around the contact part, and the brush and the protruding part are not fixed anywhere, so switching in either direction is extremely easy.
Moreover, since the contact resistance is the same when sliding in either direction, switching in both directions can be performed with the same force.

〔Example〕

Fig. 2 is an exploded view of the changeover switch according to the embodiment of the present invention, where A is a plan view of the brush, B is a side view thereof, C is a plan view of the movable plate, and D is a side view partially shown in cross section. be. In the figure, reference numeral 11 denotes a rectangular brush made of spring material, and an elongated cutout 12 with a length l ₁ and a width w ₁ is formed in the longitudinal direction of the brush, leaving both ends intact. Contact part 1 in the center
3 is provided, and is bent into a chevron shape with the contact portion 13 as the apex, and is formed symmetrically. The height of this brush 11 is h ₁ under no load. 1
Reference numeral 5 designates a movable plate, on which a long and narrow protrusion 16 is formed that protrudes upward parallel to the sliding direction of the movable plate.
Lower bearings 17, 17 are provided. The length l ₂ of the protrusion 16 is longer than the length l ₁ of the cutout 12 of the brush 11 under no load, and the width W ₂ of the protrusion 16 is slightly narrower than the width w ₁ of the cutout 12. has been done.

FIG. 3 is an assembly diagram of the changeover switch according to the present invention, in which A is a plan view showing the brush 11 fitted to the movable plate, B is a side view thereof, and C is the state with the contact plate fixed thereon. FIG. Brush 11
To attach the brush 11 to the movable plate 15, the legs 11a, 11b of the brush 11 are spread outward, the cutout 12 is fitted into the protrusion 16, and the ends of the legs 11a, 11b are attached to the support parts 17, 17. When the removed portion 12 is released while in contact with the top, both ends 12a and 12b of the cutout portion 12 in the longitudinal direction come into contact with both side surfaces 16a and 16b of the protrusion portion 16, and the brush 1
1 is held in that position. Brush 1 at this time
1 has a height _h2 , which is lower than the height _h1 in the no-load state.

Next, as shown in Fig. C, a plurality of contacts 19 are provided in parallel at predetermined intervals in the sliding direction of the movable plate 15, and the contact plate 18 is brought into contact with the contact portion 13 of the brush 11 and held at a predetermined position. That is, when the contact portion 13 of the brush 11 is pressed down to h ₃ and fixed to a case or the like, the contact portion 13 of the brush 11 contacts the contact plate 18 with a predetermined contact pressure due to its elasticity. At this time, a small gap is maintained between both longitudinal ends 12a, 12b of the cutout 12 of the brush 11 and both side surfaces 16a, 16b of the protrusion 16.

In the changeover switch of the present invention configured as described above, when the movable plate 15 is now slid in the direction a, one side 16b of the protrusion 16 comes into contact with one end 12b of the cutout 12 of the brush 11. contact,
The contacts 19 are switched by sliding the brush 11 in the direction a. Similarly, by sliding the movable plate 15 in the direction of arrow b, the contacts on the opposite side can be switched.
In this case, the brush 11 is configured symmetrically around the contact portion 13, and the brush 11 and the protruding portion 16 are not fixed anywhere, so a,
b Switching in either direction is extremely light, and since the contact resistance is the same when sliding in either direction, switching in both directions can be performed with the same force. That is, as shown in Figure D, the resultant force when sliding the movable plate 15 in both directions is F ₃ = F ₄ and the angle with the perpendicular passing through the contact portion 13 is θ ₁ = θ ₂ . The force required to drive 15 is F ₂ =F ₂ .

In the above description, the present invention is applied to a linear sliding type changeover switch, but it goes without saying that the present invention can also be applied to a rotary sliding type changeover switch. In addition, although the case where the elongated cutout part 12 is provided in the longitudinal direction of the brush 11 is shown, depending on the application, a contact part 13 is provided in the center in the longitudinal direction as shown in FIG. 1
2, 12 may be formed. Furthermore, the protrusion 16
shows the case of a block-shaped protrusion having a length l ₂ and a width w ₂ ; however, when using the brush 11 shown in FIG. Two pillars or blocks of _w2 may be provided.

[Effect of idea]

As detailed above, the changeover switch of the present invention does not require fixing the brush to the movable plate with screws, etc.
Since it is sufficient to simply fit into the protruding portion, manufacturing and assembly are extremely easy and costs can be reduced.Moreover, switching is easy and the contact resistance is exactly the same whether it is left or right. Therefore, the switching operation is reliable, there is little wear on the contact parts, and it can withstand long-term use, which has great practical effects.

[Brief description of the drawings]

FIG. 1 shows an example of a conventional sliding type changeover switch, in which A is a vertical sectional view of the main part, B is a plan view of the brush, and C and D are explanatory views of the operation. FIG. 2 is an exploded view of the embodiment of the present invention, in which A is a plan view of the brush, B is a side view thereof, C is a plan view of the movable plate, and D is a partially sectional side view thereof. Figure 3 is an assembly diagram of the embodiment of the present invention, where A is a plan view showing the state in which the brush is attached to the movable plate, B is its side view, C is a side view showing the state in which the contact plate is attached, and D is the operation. The explanatory drawing, FIG. 4, is a plan view of another embodiment of the brush. 11: Brush, 12: Resection part, 13: Contact part,
15: Movable plate, 16: Projection part, 17: Support part, 1
8: Contact plate.

Claims (1)

[Claims for Utility Model Registration] Consisting of a rectangular spring material, having a contact portion at the center in the longitudinal direction, and having an elongated cut-out portion in the longitudinal direction leaving both ends intact, forming a chevron shape with the contact portion as the apex. a bent brush; a protrusion that is provided parallel to the sliding direction and has a width slightly narrower than the width of the cutout of the brush and longer than the length of the cutout when the brush is in an unloaded state; and a longitudinal length of the protrusion. A movable plate provided with supporting parts lower than the protrusion near both sides of the direction, and a contact plate provided with a plurality of contacts in parallel at predetermined intervals in the same direction as the sliding direction of the movable plate. The cutout part of the brush is fitted into the protruding part of the movable plate so that both ends thereof are supported by the support part, and the contact plate is disposed on the brush and the contact part of the brush is pushed down. A changeover switch that fixes the contact plate to a case, etc.