JPH0731473Y2 - Limit switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a limit switch used for opening / closing control of an electric screen opening / closing device such as a curtain, a curtain, and a projection screen.

(B) Conventional Technology Conventionally, as a limit switch used for the above-mentioned opening / closing control, for example, as shown in FIG.
The operation pin 18 held so that it can be retracted from the upper surface of 17 is pushed down to push down the movable contact 20 pressed against the upper fixed contact 19 side against the elastic force of the leaf spring 21, and the lower fixed contact 19 Limit switch 22 that opens and closes the circuit by pressing movable contact 20 to the side
There is.

(C) Problems to be solved by the invention However, since the leaf spring 21 is integrally formed on the movable contact 20 described above, and the elastic force of the leaf spring 21 causes the movable contact 20 to return, the switch is When assembling the movable contact 20 inside the case 17, it is necessary to integrally assemble the movable contact 20 and the leaf spring 21, and the number of assembling parts and the number of assembling steps constituting the limit switch 22 increase. Not
Since the internal structure becomes complicated, there is a problem that it takes time and effort to assemble the limit switch 22 and the production cost becomes high.

In view of the above problems, the present invention has a peculiar structure in which the movable contact is brought into contact with and separated from the elastic force by the rotating operation of the mover, so that the internal structure is simplified and the entire switch is easily assembled. The purpose is to provide limit switches that can

(D) Means for Solving the Problems This invention has an operation piece formed on one side peripheral surface portion of a mover housed and held inside a switch case, and the operation piece is projected to the outside of the switch case so that the operation position is left and right. And a flat surface portion for holding the neutral position of the operation piece by the elastic force of the movable contact on a peripheral surface portion of one side of the mover that is rotatably operated at the position and the movable contact. In the turning operation to the left and right, it is a limit switch which forms a cam surface having an end surface for turning the contact in reverse while turning against the biasing force for returning the operation piece to the neutral position. And

(E) Action In this invention, when the moving body comes into contact with the operating piece of the mover protruding outside the switch case, the mover rotates to the left and right positions around the neutral position, and the cam surface formed on the mover. The movable contact is elastically displaced in the contacting / separating direction by the contacting / separating operation between the fixed contact and the movable contact to open / close the contact.

On the other hand, when the moving body separates from the operation piece of the mover, the mover is pivotally returned to the intermediate position via the cam surface by the elastic force of the move contact, and the move contact is elastically returned to the initial position.

(F) Effect of the Invention According to this invention, when the movable element is rotated and the contacts are brought into contact with each other, the movable contact elastically returns to the initial neutral position by its own elastic force. No need to process or assemble the leaf spring 21, as in item 22, reducing the number of assembly parts and assembly man-hours, simplifying the internal structure of the switch, and facilitating the assembly of the entire switch.
The manufacturing cost can be reduced.

Moreover, since the contacts come into contact with and separate from each other when the movable element is rotated to the left or right, one limit switch is provided as a positioning switch for setting the stop position of the moving body by disposing limit switches in the middle or at the end of the moving path. Can also be used as a switch.

(G) Embodiment of the Invention One embodiment of the invention will be described in detail below with reference to the drawings.

The drawings show a limit switch which is operated by horizontal movement of an operating body. In FIGS. 1 and 2, the limit switch 1 comprises a rectangular switch case 2 having an open upper surface and a pair of connection terminals. 3,4 and mover 5
And an insulating plate 6 and a case cover 7.

Inside the switch case 2 described above, the connection terminals 3 and 4 are fitted and fixed to the fitting portions 2a and 2a formed at both ends, and the screws 8 and 8 are provided on the upper ends of the connection terminals 3 and 4 at the base end side. Two cords screwed together
Connect and fix 9,9.

A fixed contact 10 is projectingly provided on the hanging piece 3a formed on the lower end side of one of the connection terminals 3, and a long size is formed on the hanging piece 4a formed on the lower side of the base end of the other connecting terminal 4. Plate-shaped movable contacts 11 are continuously provided toward the fixed contacts 10 side, and the movable contacts 11 are bent and formed in a direction in which they are pressed against the fixed contacts 10, and the elastic force of the movable contacts 11 causes the fixed contacts 10 to contact the fixed contacts 10. The movable contact 11 is always urged to be in pressure contact.

The mover 5 described above is held in a storage portion 2b formed in the central portion of the switch case 2, and a support shaft 12 projecting from the center portion of the bottom surface of the storage portion 2b is provided with a shaft formed in the central portion of the movable element 5. An operation piece inserted through the hole 5a and formed on the upper surface of one side of the mover 5.
The cutout 2c formed on the upper edge of the storage portion 2b on the operation surface side.
2 to the outside, and as shown in FIG. 2, with the support shaft 12 as a pivotal fulcrum, a neutral position (solid line position) and, as shown in FIG. 3, left and right positions (positions of virtual line and solid line). ) And the movable element 5 is rotatably provided.

A cam surface 13 is formed on one side peripheral surface portion of the mover 5 corresponding to the above-mentioned operation piece 5b side. As shown in FIG. 2, the operation piece 5b is arranged at a neutral position (solid line position) and in FIG. As shown, when the end faces 13a, 13a of the cam surface 13 protruding in the radial direction are brought into contact with the flat surface portion of the movable contact 11 by rotating to the left and right positions (positions between the virtual line and the solid line), the fixed contact is formed. The movable contact 11 is separated from 10.

On the other hand, as shown in FIG. 2, when the operation piece 5b is rotated to the neutral position and the flat surface 13b of the cam surface 13 faces the flat surface portion of the movable contact 11, the fixed contact 10 and the movable contact 11 are pressed together. Is acceptable.

The above-mentioned insulating plate 6 is fitted on the upper surface of the storage portion 2b, and the two screws
14, 14 are screwed to both ends of the insulating plate 6 so as to be tightened and fixed, and an arc-shaped guide formed at the center of the plane through the notch 6a formed at one side edge of the insulating plate 6. Groove 6b
The operation piece 5b formed on the upper surface of one side of the mover 5 is rotatably engaged therewith.

The above-mentioned case cover 7 is fitted on the upper surface of the switch case 2, and one screw 15 is screwed into the central portion of the upper surface of the case cover 7 and fixed by tightening.

The switch case 2, the mover 5, the insulating plate 6, and the case cover 7 are made of synthetic resin.

Assuming that the illustrated embodiment is configured as described above, the ON / OFF operation of the limit switch 1 will be described below.

First, when the limit switch 1 is turned off, as shown in FIG. 3, the operating body 16 is horizontally moved in the A direction or the B direction to face the operation surface side of the limit switch 1 at the central position (solid line position or virtual position). When the operating body 16 is moved to the (line position), the operating body 16 comes into contact with the operating piece 5b of the movable element 5 protruding toward the operating surface side of the switch case 2, and at the same time, the cam surface 13 formed on the movable element 5 moves. The end surfaces 13a, 13a and the flat surface portion of the movable contact 11 come into contact with each other, and the operation piece 5b of the mover 5 is rotated to the left / right position (solid line position or virtual line position) against the elastic force of the movable contact 11.

At this time, the movable contact 11 is elastically displaced in the separating direction by the end surfaces 13a, 13a of the cam surface 13 formed on the mover 5, and the fixed contact 10
The movable contact 11 is separated from to close the circuit to the OFF state.

Next, when turning on the limit switch 1, as shown in FIG. 2, the operating body 16 is horizontally moved in the A direction or the B direction,
When the operating body 16 is separated from the operating piece 5b of the mover 5, the movable restriction of the mover 5 is released, and the flat surface portion of the movable contact 11 is pressed against the flat surface 13b of the cam surface 13 formed on the mover 5 to move the movable body 5. Contact 1
By the elastic force of 1, the operating piece 5b of the mover 5 is returned to the neutral position (solid line position) by rotation, and at the same time, the fixed contact 10 is moved to the movable contact.
Press 11 to open the circuit to the ON state.

In this way, the movable element 5 is rotated in the A direction or the B direction to move the fixed contact 10 and the movable contact 11 to and from each other.
When the switch is returned to the neutral position, the movable contact 11 elastically returns to the initial position by the elastic force, so there is no need to process or assemble the leaf spring 21 unlike the conventional limit switch 22. Reduced man-hours, switch case 17
It is possible to reduce the production cost by simplifying the internal structure of the device and easily assembling the entire limit switch 1.

Moreover, since it is a switch mechanism in which the fixed contact 10 and the movable contact 11 are brought into contact with and separated from each other by the leftward and rightward rotation operation of the mover 5, the movable contact (not shown) such as a curtain or a screen may be provided in the middle or at the end. Each limit switch 1 is arranged,
One limit switch 1 can also be used as a positioning switch for setting the stop position of the moving body.

The present invention is not limited to the configuration of the above-described embodiment.

For example, a fixed contact that constitutes the limit switch 1 described above.
It is also possible to provide the movable contact 11 and the movable contact 11 separately from each other, and rotate the mover 5 in the A direction or the B direction by the operating body 16 to elastically displace the movable contact 11 to the fixed contact 10 side and press the movable contact 11.

It is also possible to fix the above-mentioned operating body 16 at a fixed position and horizontally move the limit switch 1 side in the A direction or the B direction to bring the contacts into and out of contact with each other.

[Brief description of drawings]

The drawings show one embodiment of the present invention, FIG. 1 is an exploded perspective view of a limit switch, FIG. 2 is an explanatory view of ON operation of a limit switch, FIG. 3 is an explanatory view of OFF operation of a limit switch, and FIG. It is a partial cross-section perspective view of the conventional type limit switch. 1 ... Limit switch, 2 ... Switch case 3,4 ... Connection terminal, 5 ... Mover 10 ... Fixed contact, 11 ... Movable contact 13 ... Cam surface, 13a ... End surface 13b ... Plane, 16 ... Operator

Claims (1)

[Scope of utility model registration request] 1. A limit switch which opens and closes a circuit by operating a fixed contact and a movable contact provided inside a switch case to open and close a circuit, and which is operated on one side peripheral surface of a mover housed and held inside the switch case. And an operating piece protruding outside the switch case so as to be pivotable between a neutral position and a left-right position, and an elastic portion of the movable contact is provided on one side peripheral surface portion of the mover that is in contact with the movable contact. When the flat portion that holds the neutral position of the operation piece by force and the rotation operation of the operation piece to the left and right are rotated against the biasing force for returning the operation piece to the neutral position, the contact point is A limit switch that forms a cam surface that has an end face that is reversed.