JPH0641297Y2 - Switch structure - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a switch such as a limit switch having an inversion element.

[0002]

2. Description of the Related Art FIG. 6 shows a contact mechanism portion of a conventional limit switch, which is provided with an operating shaft 21 which is movable in the longitudinal direction of a body 1. A movable contact plate 22 is attached to the operating shaft 21. I'm wearing it. The movable contacts 23 are fixed to the upper and lower surfaces of both sides of the movable contact plate 22. Movable contact plate 22
A fixed terminal 25 on the normally closed side is provided below the fixed terminal 25, and the fixed terminal 25 has a fixed contact 26 facing the lower movable contact 23.
Is provided.

A fixed terminal 27 on the normally open side is arranged above the movable contact plate 22, and a fixed contact 28 facing the movable contact 23 on the upper side is provided on the fixed terminal 27. A reversing element 24 is interposed between the operating shaft 21 and the movable contact plate 22, and the moving contact point 22 is reversed by the action of the reversing element 24 by the movement of the operating shaft 21 in the longitudinal direction to switch the contact. There is.

Inverter 24, as shown in FIG. 7 and FIG.
Inside the tubular body 30 having the locking portion 29, the locking portion 31 is provided on the opposite side.
A shaft 32 having a is slidable in the axial direction by a coil spring 33.

[0005]

[Problems to be solved by the invention]
Is parallel to the movable contact plate 22 (point P in FIG. 7 is the movable contact plate 22).
(The moment it crosses), it will be reversed. In this case, the end portion of the movable contact plate 22 on which the locking portion 31 of the reversing element 24 is locked is punched out by a press, so that it is not a completely vertical cross section as shown in FIG. As shown in), it has an inclination or bulges due to the treatment of burrs.

Therefore, even when the point P exceeds the movable contact plate 22, there is a maximum variation in the thickness of the movable contact plate 22, and there is a large variation defect in operating characteristics, particularly in the distance to the operation. . Further, there is a problem that the snap action property is poor in the case of low speed operation. In FIG. 10, the point S in the figure is the center of the inversion. The present invention has been provided in view of the above points, and has a switch structure for stabilizing the reversal characteristic by determining the center of the reversal movement of the movable contact plate and improving the snap action property. It is provided.

[0007]

According to the present invention, an operating shaft driven by an external operation is provided in a body so as to be movable in one direction, and a movable contact is provided in a direction orthogonal to the moving direction of the operating shaft. A plate is provided, and movable contacts facing the fixed contacts are respectively provided on the upper and lower surfaces of the end of the movable contact plate, and the movable contact plate is positioned by urging the movable contact plate upward or downward depending on the position of the operating shaft. In a switch in which a reversing element is inserted between an actuating shaft and a movable contact plate, a concave locking portion that locks an end edge of the movable contact plate is formed at the end of the reversing element, and the concave shape of the locking portion is formed. A rib is formed on a portion of the movable contact plate to which the end surface of the movable contact plate abuts.

[0008]

By the rib contacting the end face of the movable contact plate with the concave portion of the reversing element, the reversing motion of the movable contact plate is irrelevant regardless of the shape of the end face with which the engaging portion of the movable contact plate abuts. Therefore, the reversal characteristics of the movable contact plate are stable, and the operation characteristics such as the distance to the operation are stable. Also in, a switch with a good snap action property can be obtained.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. The overall configuration is the same as the conventional example, and therefore,
The description of the same parts as the conventional one will be omitted. The present invention is an invertor 24
The shape of the locking portion 31 is characterized, and the gist thereof will be described in detail. That is, as shown in FIG. 1 and FIG.
A rib 34 having a triangular cross section is provided in the recess of the locking portion 31 of the reversing element 24. And this rib 34
The rib 34 serves as the center of reversal of the movable contact plate 22 by bringing the end surface of the movable contact plate 22 into contact with.

By doing so, even if the end surface of the movable contact plate 22 where the locking portion 31 of the reversing member 24 abuts is slightly inclined, or even if it is slightly swollen due to the burring process, the rib is increased. The portion 34 serves as the center of reversal of the movable contact plate 22. In FIG. 3, the tip of the rib 34 is a flat surface, which is effective for burr and burrs on the end surface of the movable contact plate 22. In FIG. 4, the rib 34 of the locking portion 31 of the reversing member 24 is formed in a cross shape, and the assembling property and the positioning property are improved. In FIG. 5, the tip surface of the cross-shaped rib 34 is a flat surface.

By providing the rib 34 on the locking portion 31 of the reversing element 24 in this manner, the reversal characteristic of the movable contact plate 22 is stabilized regardless of the shape of the end surface of the movable contact plate 22 with which the locking portion 31 abuts. In addition, the operating characteristics such as the distance to the operation are stable. Further, the limit switch having a good snap action property can be obtained even at a low speed operation in which the actuator is operated at an extremely low speed.

[0012]

As described above, according to the present invention, the operating shaft driven by an external operation is provided in the body so as to be movable in one direction, and the movable contact is movable in the direction orthogonal to the moving direction of the operating shaft. A plate is provided, and movable contacts facing the fixed contacts are respectively provided on the upper and lower surfaces of the end of the movable contact plate, and the movable contact plate is positioned by urging the movable contact plate upward or downward depending on the position of the operating shaft. In a switch in which a reversing element is inserted between an actuating shaft and a movable contact plate, a concave locking portion that locks an end edge of the movable contact plate is formed at the end of the reversing element, and the concave shape of the locking portion is formed. Since the ribs are formed in the portions with which the end surface of the movable contact plate comes into contact, the ribs come into contact with the end surface of the movable contact plate at the concave portion of the reversing element, and the end surface with which the locking portion of the movable contact plate comes into contact. The center of the reversing motion of the movable contact plate can be determined regardless of the shape of Therefore, the reversal characteristics of the movable contact plate are stable, and the operation characteristics such as the distance to the operation are stable. Furthermore, the snap action property is good even at low speed operation in which the actuator is operated at an extremely low speed. The effect is that a switch is obtained.

[Brief description of drawings]

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

FIG. 2 is a perspective view of an essential part of the inversion element of the above.

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

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

FIG. 5 is a perspective view of a main portion of another embodiment of the above rib.

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

FIG. 7 is a front view of the main part of the above.

FIG. 8 is a plan view of the inversion element of the above.

FIG. 9 is a cross-sectional view of an essential part of the above.

10 (a) and 10 (b) are cross-sectional views showing the respective problems.

[Explanation of symbols]

 1 Body 21 Operating Axis 22 Moving Contact Plate 23 Moving Contact 24 Reversing Element 26 Fixed Contact 28 Fixed Contact 31 Locking Part 34 Rib

Claims (1)

[Scope of utility model registration request] 1. An operating shaft driven by an external operation is provided in a body so as to be movable in one direction, and a movable contact plate is provided in a direction orthogonal to the moving direction of the operating shaft. Movable contacts facing the fixed contacts are respectively provided on the upper and lower surfaces of the end of the, and a reversing element that positions the movable contact plate by urging the movable contact plate upward or downward depending on the position of the operating shaft is provided with an operating shaft and the movable contact. In the switch inserted between the movable contact plate and the plate, a concave locking portion that locks the edge of the movable contact plate is formed at the end of the reversing member, and the end surface of the movable contact plate is formed in the concave portion of the locking portion. A switch structure characterized by forming ribs that abut against each other.