JPH051865Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention provides a pair of common contact patterns formed in parallel on a substrate that are slidably connected in common to a continuous-shaped common contact pattern and an intermittent-shaped switching contact pattern. This invention relates to an improvement in a selector switch that intermittently switches contacts by pressing and sliding the contacts (brushes) of the switch.

[Conventional technology]

For example, in industrial instruments such as multi-point recorders, a large number of switching contacts are connected in the circumferential direction as a multi-point input switch for sequentially switching and intermittently inputting measured values at a large number of measuring points to a measuring circuit. Selector switches arranged in parallel are used. This is the fourth
To explain briefly using the figure, reference numeral 1 in the figure is a contact board on which a selector pattern (consisting of a common contact pattern 2 and a switching contact pattern 3 as shown in FIG. 5) is formed. A substrate 1 is attached to the tip of a support shaft 4 that is supported by penetrating this substrate 1.
A selector arm 5 is provided which is rotated relative to the selector arm 5, and a pair of contacts (brushes) 6, 7 are provided at both ends of the arm 5 to press and slide against each of the contact patterns 2, 3. There is. In addition, 8 in the figure is a leaf spring exhibiting a substantially U-shape as shown in FIG. 6, 6a, 6b; 7, 7a, 7b are provided. Here, the reason why two contacts are used in this way is to ensure the reliability of the switch.
. . . are dummy portions protruding from the common contact pattern 2 side between the respective switching contacts 3a, 3b, .

In addition, in the figure, reference numeral 9 denotes a cover that is placed on the substrate 1;
A motor 10 is connected to the support shaft 4 via gears 11a and 11b to rotate the arm 5.
Reference numeral 12 denotes a mounting frame.

In such a configuration, as shown in FIG. The switching contacts 3a, 3b, . It is designed so that it can be used.

By the way, in the above-mentioned selector switch, the contacts (for example, 2a, 2b, ...; 3a, 3b,
As is clear from Fig. 5, it has been common practice in the past for both sides of the circumferential direction of the Ta. This is to prevent the contact from falling into the groove by contacting the next contact before it falls from the end of each contact into the groove where there is no contact pattern when switching from one contact to the other. This was to maintain the lifespan of 6 and 7.

[Problem that the invention attempts to solve]

However, as described above, the contacts 2a, 2b, . . . ; 3a, 3b, .
If the contacts 6 and 7 are placed through the diagonal grooves, the contacts 6 and 7 will be in stable contact with each contact point, and a space in the circumferential direction to obtain conduction will be required over a considerable rotation angle. As a result, the number of contacts that can be set within a limited space is limited, and there is a limit to the number of contacts that can be provided.
Therefore, if the outer diameter of the selector pattern is limited and a large number of contacts is required,
In order to use a selector switch with a multi-stage structure or to reduce the rotation angle required to switch one contact, the length of each spring piece of the leaf spring 8 that supports the contacts 6 and 7 is set so that the inner side is shorter. It was necessary to take measures such as shifting the contact position of the contact to the contact point.
However, with such a configuration, it is difficult to properly maintain the spring characteristics of the leaf spring 8, and variations occur in the strength of both spring pieces, resulting in not only poor balance but also a tendency for stable contact to fail. There were also problems in terms of workability of springs, etc.

It is also possible to increase the number of contacts in the contact pattern by forming the grooves of the contact patterns 2 and 3 in a radial manner, which is advantageous when the number of contacts is large. falls into the groove between each contact one after another when sliding, and the resulting vertical movement is repeated when each contact is switched.
Problems arise in that repetitive bending stress is generated in the contacts 6 and 7, and the life of the contacts 6 and 7 is shortened.Therefore, it is desired that some kind of countermeasure be taken to eliminate these problems.

[Means for solving problems]

In order to meet such demands, the selector switch of the present invention comprises a substrate on which a continuous common contact pattern and an intermittent switching contact pattern are formed in parallel in the circumferential direction, and a selector arm which has a pair of contacts which are pressed and slidably contacted on each of the contact patterns to switch the contacts, and which rotates relative to the substrate, and the side edges of each of the contact patterns in the circumferential direction are formed so as to present an approximately "L" shape with an apex protruding in the sliding direction of the contact.

[Effect]

According to the present invention, the rotation angle of the contact sliding on the contact pattern can be reduced, thereby increasing the number of contacts and achieving miniaturization.Moreover, during sliding operation, the contact can be moved into a groove without a pattern. There is no problem that the lifespan of the contact will be shortened due to the drop in temperature.

〔Example〕

Hereinafter, the present invention will be explained in detail using embodiments shown in the drawings.

Figures 1 to 3 show an embodiment of the selector switch according to the present invention, and in these figures, parts that are the same as or correspond to those in Figures 4 and 5 described above are designated by the same numbers. Therefore, the explanation will be omitted.

Now, according to the present invention, a substrate 1 has a common contact pattern 2 having a continuous shape and a switching contact pattern 3 having an intermittent shape formed in parallel in the circumferential direction.
and a selector arm 5 which has contacts 6 and 7 that are pressed and slid onto each of the contact patterns 2 and 3 of the substrate 1 and is rotated relative to the substrate 1,
In a selector switch in which contacts are switched by sliding the contacts 6 and 7 on each contact pattern 2 and 3, the side edges 20 of the contacts constituting each contact pattern 2 and 3 in the circumferential direction are connected to the contacts 6 and 7. 7
It is characterized in that it is formed approximately in the shape of a dogleg, with the top protruding in the sliding direction.

Here, in FIG. 1, there are two divided common contact patterns 2A, 2B and two groups of switching contact patterns 3A, 3B, each having 13 pieces in total, 26 pieces.
The figure shows a selector switch having 21 contacts, and 21 in the figure is a position detection contact part, 22A,
22B is a signal extraction section from each contact point.

According to such a configuration, the contacts 2a, 2b, . . .;
As is clear from Fig. 3, the rotation angle for the contacts 6, 7 to pass over a, 3b, . This makes it possible to increase the number of contacts within a limited space, and when forming the same number of contacts, the overall size can be reduced. moreover,
With the above-mentioned configuration, as is clear from FIG. 2, etc., there is no problem such as when the contacts 6 and 7 fall into the groove without a pattern between the contacts during sliding operation, thereby extending the life of the contacts. This is something that can be achieved.

In particular, according to the above-mentioned dogleg-shaped side edge 20, this portion is connected to the two switching side contacts 7.
It is easily understood that the number of contacts in the switching contact pattern 3 can be increased by allowing the contacts a and 7b to pass through at the same time.

Moreover, according to the above-mentioned configuration, the size of the switch can be minimized in relation to the required number of contacts, so that it is possible to reduce the cost of the entire switch. This is because the surface of the selector pattern mentioned above is generally subjected to a special plating treatment from the viewpoint of electrical characteristics and lifespan, and the size of the pattern surface as mentioned above has a large impact on cost. This can be easily understood for the following reasons.

Note that the present invention is not limited to the structure of the embodiment described above, and the shape, structure, etc. of each part of the selector switch may be modified or changed as appropriate. For example, the selector pattern shape on the substrate 1 is as follows:
It is clear that the pattern is not limited to the example shown in Figure 1, and that various modifications are possible, and that it may also be applied to contacts that use only a pair of common side and switching side. Probably.

Furthermore, it will be easily understood that the application of the selector switch according to the present invention is not limited to the above-mentioned industrial instruments.

[Effect of idea]

As explained above, according to the selector switch according to the present invention, the circumferential side edge of each contact constituting the common contact pattern and the switching contact pattern arranged on the board is aligned in the sliding direction of the contact. Since it is formed in a roughly dogleg shape with a protruding top, the rotation angle of the contact that slides on the contact pattern is reduced despite the simple structure, which makes it easier to use than before. This makes it possible to increase the number of circuit switching contacts on the board, and also to reduce the overall size.Furthermore, during sliding operation, the contacts fall into grooves without contact patterns, which reduces the lifespan of the contacts. There are various excellent practical effects such as not causing the problem of shortening the length.

[Brief explanation of drawings]

Fig. 1 is a schematic plan view of a contact board showing an embodiment of the selector switch according to the present invention, Fig. 2 is an enlarged schematic plan view of the main part showing the relationship with contacts, and Fig. 3 is a schematic plan view according to the present invention. FIG. 4 is a schematic sectional view showing a schematic configuration of a selector switch, and FIG. 5 is a schematic plan view showing a conventional example. 1...Contact board, 2...Common contact pattern, 3
...Switching contact pattern, 2a, 2b,..., 2n
...Dummy contact part, 3a, 3b, ..., 3m ... Switching contact, 4 ... Support shaft, 5 ... Selector arm,
6, 6a, 6b; 7, 7a, 7b... Contact, 8, 8a, 8b... Leaf spring, 20... "ku"
-shaped side edge.

Claims (1)

[Scope of utility model registration request] A substrate in which a common contact pattern having a continuous shape and a switching contact pattern having an intermittent shape are formed parallel to each other in the circumferential direction, and a pair of contacts that are pressed and slid onto each contact pattern of this substrate. In a selector switch that includes a selector arm that rotates relative to a substrate and switches the contact by sliding the contact on each contact pattern, a side edge of each contact pattern in the circumferential direction is connected to the contact. 1. A selector switch characterized in that the selector switch is formed in a substantially dogleg shape with the top protruding in the sliding direction of the selector switch.