JPH04102527U - Structure of switch - Google Patents

Abstract

(57) [Summary] [Purpose] To stabilize the reversal characteristics by determining the center of the reversal motion of the movable contact plate, and to improve the snap action performance. [Structure] A rib 34 having a triangular cross section is provided in a concave portion of a locking portion 31 of an inverter 24. The end surface of the movable contact plate 22 is brought into contact with this rib 34. This rib 34 becomes the center of reversal of the movable contact plate 22. Therefore, even if the end surface of the movable contact plate 22 where the locking part 31 of the inverter 24 comes into contact is a little slanted, or even if it is slightly bulged due to burr treatment, the ribs 34 will remain on the movable contact plate. 22 is the center of inversion.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to the structure of a switch such as a limit switch equipped with an inverter. It is.

0002

[Conventional technology]

Figure 6 shows the contact mechanism of a conventional limit switch, and shows the length of the body 1. An operating shaft 21 is provided which is movable in the hand direction, and a movable contact plate 22 is attached to this operating shaft 21. is attached. Movable contacts 23 are fixed to the upper and lower surfaces of both sides of this movable contact plate 22. ing. A normally closed fixed terminal 25 is provided below the movable contact plate 22, and the fixed end The child 25 is provided with a fixed contact 26 that faces the movable contact 23 on the lower side.

0003 A normally open fixed terminal 27 is arranged above the movable contact plate 22. 7 is provided with a fixed contact 28 facing the upper movable contact 23. Actuation axis 2 1 and the movable contact plate 22, an inverter 24 is interposed between the movable contact plate 22 and the movement of the operating shaft 21 in the longitudinal direction. Due to the movement, the movable contact plate 22 is reversed by the action of the inverter 24 to switch the contact. It has become.

0004 As shown in FIGS. 7 and 8, the inverter 24 is inserted into a cylindrical body 30 having a locking portion 29. A shaft 32 having a locking portion 31 on the opposite side slides in the axial direction by a coil spring 33. It is free.

[0005]

[Problem that the idea aims to solve]

Therefore, the inverter 24 is parallel to the movable contact plate 22 (point P in FIG. 7 is parallel to the movable contact plate 22). (the moment when it crosses the line), it is reversed. In this case, the locking portion 31 of the inverter 24 is engaged. The end of the movable contact plate 22 to be stopped is completely punched out as shown in FIG. It is not a vertical cross section, but a sloped or curved cross section as shown in Figure 10(a)(b). It is swollen due to the processing of li.

[0006] Therefore, even at the moment when point P crosses the movable contact plate 22, the movable contact plate There is a large variation in the operating characteristics, especially the distance to the operation. There are some drawbacks. Also, in the case of low-speed operation, there is a problem of poor snap action performance. There is also. Note that in FIG. 10, point S in the figure is the center of inversion. The present invention has been proposed in view of the above-mentioned points. To make the reversal characteristics stable and improve the snap action characteristics. This provides a switch structure for the purpose of

[0007]

[Means to solve the problem]

This invention has a body that allows the operating shaft, which is driven by external operation, to move freely in one direction. A movable contact plate is provided in the direction perpendicular to the moving direction of this operating shaft, and this movable A movable contact opposite the fixed contact is provided on the upper and lower surfaces of the end of the movable contact plate, and the position of the operating axis is adjusted. Inversion that positions the movable contact plate by forcing it upward or downward depending on the position of the movable contact plate. In a switch in which a child is inserted between the operating shaft and the movable contact plate, the edge of the movable contact plate A concave locking portion is formed at the end of the inverter, and a movable contact is provided in the concave portion of the locking portion. A rib is formed on which the end surface of the point plate comes into contact.

[0008]

[Effect]

Therefore, the rib comes into contact with the end surface of the movable contact plate on the concave part of the inverter, so that it is possible to Regardless of the shape of the end surface that the locking part of the movable contact plate comes into contact with, during the reversal movement of the movable contact plate. As a result, the reversal characteristics of the movable contact plate are stable, and the operation is stable. The operating characteristics such as the distance to the Even during low-speed operation, the switch has good snap-action properties. can get.

[0009]

【Example】

Embodiments of the present invention will be described below with reference to the drawings. The overall configuration is the same as the conventional example. Therefore, the explanation of the same parts as the conventional one will be omitted. This invention is based on the inverter 24. The shape of the locking portion 31 is characteristic, and the gist thereof will be described in detail. That is, as shown in FIG. 1 and FIG. A rib 34 having a triangular surface is provided. And this rib 34 is movable. This rib 34 is placed on the opposite side of the movable contact plate 22 so that the end face of the contact plate 22 comes into contact with it. It was designed to be the center of change.

0010 By doing this, the locking portion 31 of the inverter 24 of the movable contact plate 22 comes into contact with the movable contact plate 22. Even if the end face of the part is slightly slanted or slightly bulged due to burr treatment, However, the rib 34 becomes the center of reversal of the movable contact plate 22. In FIG. 3, the tip of the rib 34 is made flat, and the end surface of the movable contact plate 22 has a burr. It is effective against burrows, etc. In FIG. 4, the ribs 34 of the locking portion 31 of the inverter 24 are shaped like a cross. This has improved ease of assembly and positioning. Figure 5 shows a cross-shaped The tip end surface of the rib 34 is made flat.

[0011] By providing the ribs 34 on the locking portion 31 of the inverter 24 in this way, the movable contact plate 2 The reversal characteristics of the movable contact plate 22 are stable regardless of the shape of the end surface that the locking portion 31 of 2 contacts. In addition, the operating characteristics such as the distance to operation are stable. In addition, even during low-speed operation where the actuator is operated at extremely low speed, the snap-on This provides a limit switch with good actionability.

0012

[Effect of the idea]

As mentioned above, this invention moves the operating shaft in one direction, which is driven by external operation. A movable contact plate is freely installed in the body, and a movable contact plate is installed in the direction perpendicular to the moving direction of this operating shaft. A movable contact is provided opposite to the fixed contact on the upper and lower surfaces of the end of the movable contact plate. , bias the movable contact plate upward or downward depending on the position of the operating shaft to position the movable contact plate. In a switch with a reversing element to determine the movable contact plate inserted between the operating shaft and the movable contact plate, A concave locking portion that locks the edge of the contact plate is formed at the end of the inverter, and the concave portion of the locking portion locks the edge of the contact plate. Since a rib is formed on the part of the movable contact plate, the end surface of the movable contact plate comes into contact with the concave part of the inverter. When the rib comes into contact with the end surface of the movable contact plate, the locking part of the movable contact plate comes into contact with the shaped part. The center of reversal motion of the movable contact plate can be determined regardless of the shape of the contacting end surfaces. Therefore, the reversal characteristics of the movable contact plate are stable, and the operating characteristics such as the distance to operation are Furthermore, the actuator can be operated at extremely low speeds. Even when operating, the effect of obtaining a switch with good snap action properties is achieved. It is something to play.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention.

FIG. 2 is a perspective view of essential parts of the inverter same as above.

FIG. 3 is a perspective view of a main part showing another embodiment of the same rib.

FIG. 4 is a perspective view of a main part of still another embodiment of the same rib.

FIG. 5 is a perspective view of a main part of another embodiment of the same rib.

FIG. 6 is a plan view of a conventional limit switch.

FIG. 7 is a front view of the main parts same as above.

FIG. 8 is a plan view of the inverter same as above.

FIG. 9 is a sectional view of a main part same as the above.

FIGS. 10(a) and 10(b) are cross-sectional views showing respective problems of the same as above.

[Explanation of symbols]

1 body 21 Operating axis 22 Movable contact plate 23 Movable contact 24 Inverter 26 Fixed contact 28 Fixed contact 31 Locking part 34 Rib

Claims (1)

[Scope of utility model registration request] Claim 1: An operating shaft driven by an external operation is provided in a body so as to be movable in one direction, a movable contact plate is provided in a direction perpendicular to the moving direction of this operating shaft, and this movable contact plate A movable contact facing the fixed contact is provided on the upper and lower surfaces of the end of the inverter, which positions the movable contact plate by biasing the movable contact plate upward or downward depending on the position of the operating shaft. In the switch inserted between the switch and the plate, a concave locking part that locks the edge of the movable contact plate is formed at the end of the inverter, and the end surface of the movable contact plate is formed in the concave part of the locking part. A structure of a switch characterized by forming abutting ribs.