JPH0831290A - Latching device of electromagnetic contactor - Google Patents

Abstract

PURPOSE:To accurately decide whether a slider is in a latching position or in a releasing position in mechanism for making an electromagnetic contactor in an off-state by latching the electromagnetic contactor in an on-state by the reciprocation of the slider and releasing the latch. CONSTITUTION:When a moving contact seat moves downward in order to turn on a contact, locking is released by a projection 28a, a slider 37 moves in the arrow D direction to a latching position by the elastic force of a herical extension spring 43 to latch a moving contact seat. A red part 55b in a label 55 appears in a display window 54. When current is supplied to a trip coil 48, a lever 45 is rotated and the slider 37 is moved in the opposite direction to the arrow D up to the releasing position. The latch is released and the moving contact seat is moved upward to return to the original position. A green part 55a of the label 55 appears in the display window 54.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor latch device for latching a movable contactor stand of an electromagnetic contactor in a retracted state.

[0002]

2. Description of the Related Art A conventional structure of a latch device for an electromagnetic contactor of this type is shown in FIGS. In FIG. 8, a movable contactor stand 2 for opening and closing the contactor is provided in a case 1 of the electromagnetic contactor. When a coil (not shown) is energized, the movable contact table 2 is pulled down by its magnetic attraction force to turn on the contact, and when pushed up by a return spring (not shown), the contact is turned off. When the contactor is in the off state, the upper end portion 2a of the movable contactor base 2 projects from the upper outer surface of the case 1 and moves downward to turn on the contactor.
As shown in FIG.

The cover member 4 of the latch device 3 is provided on the upper outer surface of the case 1.
A slider 5 is provided on the inner side of the slider so as to be capable of reciprocating between a release position shown in FIG. 8 and a latch position shown in FIG. The slider 5 is constantly biased in one direction indicated by an arrow A by a compression coil spring 6 provided between the slider 5 and the cover member 4. Further, a plastic roller 7 is rotatably provided on the slider 5, and when the contactor is in the off state, the roller 7 is locked to the upper end portion 2a of the movable contactor base 2 and released. Is stopped by.

A frame 8 facing the right outer surface of the case 1 is connected to the right side of the cover member 4. A lever 9 is arranged inside the frame 8, the lower end of which is rotatably supported by the lower end of the frame 8 via a shaft 10 and the upper end of which is a right end of the slider 5 by a connecting pin 11. Are linked to. Further, a solenoid type trip coil 12 constituting an electromagnetic device is provided in the lower portion of the frame 8, and when the trip coil 12 is energized, the movable iron core 13 is attached by its magnetic attraction force. The lever 9 is rotatably displaced about the shaft 10 in the arrow B direction. The lever 9, the coil 12 and the like constitute a tripping mechanism 14.

In the latch device 3 having the above structure, when the coil is energized to turn on the contactor (not shown) of the electromagnetic contactor, the movable contactor base 2 is displaced downward as shown in FIG. The upper end of the case 1 sinks from the upper and outer side surfaces. Then, the locking of the roller 7 is released, so that the slider 5
Moves in the direction of arrow A by the elastic force of the compression coil spring 6, and the roller 7 is positioned immediately above the upper end portion 2a of the movable contact base 2. When the slider 5 moves in the direction of the arrow A, the coil of the electromagnetic contactor is then cut off, which causes the movable contact base 2 to return and move upward due to the elastic force of the return spring (not shown). Since the return movement of the movable contact table 2 is stopped by the roller 7, the movable contact table 2 is latched in the retracted state, and the contact is left in the on state.

When the trip coil 12 is energized to turn off the contactor, the lever 9 is rotationally displaced in the direction of arrow B. By this rotation of the lever 9, the slider 5 moves in the direction opposite to the arrow A against the elastic force of the compression coil spring 6, so that the roller 7 is disengaged from the upper end portion 2a of the movable contact base 2, As a result, the movable contact base 2 is moved upward by the elastic force of a return spring (not shown), and the contact is returned to the off state.

[0007]

When the electromagnetic contactor is in the on state or in the off state, the slider 5 of the latch device 3 is located at the latch position or the release position, respectively. The position of is determined by the length of the strip 5a of the slider 5 protruding from the end of the cover member 4. However, it is difficult to determine the length of the protruding length of the strip 5a of the slider 5, and it is difficult to determine whether the electromagnetic contactor is in the on state or the off state. For this reason, incorrect judgment during maintenance inspection, sequence check, etc. may cause an electric shock accident.In order to prevent such accidental accident, it is in latched state or released state. There is an urgent need for a latch device that can accurately determine whether or not it is.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a latch device for an electromagnetic contactor which can accurately determine whether it is in a latched state or a released state.

[0009]

A latch device for an electromagnetic contactor according to the present invention comprises a movable contactor stand for opening and closing a contactor inside a case, and one end of the movable contactor stand operates the movable contactor stand. A latch device for an electromagnetic contactor, which is provided in an electromagnetic contactor that is configured to project and retract with respect to an outer surface of a case with displacement, and latches the movable contact table in the retracted state when the movable contact table moves in the retracted direction. In the case, in the case, a cover member provided on an outer surface on which one end of the movable contact table is projected and retracted, and reciprocatingly provided inside the cover member between a release position and a latch position, A slider that is locked to the movable contactor and is positioned at the release position when the movable contactor base is projected; and a biasing means that moves the slider from the release position to the latched position when the movable contactor base is retracted. Said slur And a pressing unit for pressing the one end of the movable contactor stand at the latch position to latch the movable contactor in the retracted position, and an electromagnetic device. A tripping mechanism for moving from the latch position to the release position against the biasing force of the biasing means, and the cover member is provided with a window,
In the slider, two portions facing the window at the latched position and the released position are colored differently.

In this case, by attaching two colored labels to the slider, different colors are applied to two portions of the slider facing the window of the cover member at the latch position and the release position. You can

[0011]

Since the color seen through the window of the cover member differs depending on whether the slider is in the latched position or in the released position, it is possible to accurately determine whether the electromagnetic contactor is on or off. When the two colored labels are adhered to the slider, the two parts of the slider can be easily color-coded.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 3 and 4, in the case 22 of the electromagnetic contactor 21, a terminal plate 23 connected to a power source is connected.
And fixed contacts 25 and 26 integrated with a terminal plate 24 connected to a load, for example, a motor, and movable contacts 27 that open and close between the fixed contacts 25 and 26.
Is provided on a movable contact base 28 housed in the case 22 so as to be movable in the vertical direction in the drawing. The terminal board 2
3 and 24, fixed contacts 25 and 26, movable contact 27
Are provided for three phases, but only one phase is shown in each figure.

A return spring 29, which is a compression coil spring, is provided between the case 22 and the movable contact base 28, and the movable contact base 28 is constantly urged upward by the return spring 29. Has been done. In addition, the movable contact table 28
A movable iron core 30 is fixed by a pin 31, and a fixed iron core 33 having a coil 32 mounted thereon is arranged on the inner bottom of the case 22 so as to face the movable iron core 30. When the coil 32 is energized, the fixed iron core 33
Attracts the movable iron core 30, and as a result, the movable contact base 28
Moves downward against the elastic force of the return spring 29 to bring the movable contact 27 into contact with (turns on) the fixed contacts 25 and 26. When the movable contact base 28 is moved upward by the elastic force of the return spring 29, the movable contact base 28 separates the movable contact 27 from the fixed contacts 25 and 26 (OFF). 3 and 4, 27a is a compression coil spring for applying a contact pressure to the movable contact 27.

Projecting pieces 28a projecting outward from through holes 22a formed in the left and right side surface portions of the case 22 are provided on both left and right sides of the movable contact table 28.
8a turns on and off the switches 34 attached to the left and right outer surfaces of the case 22 by reciprocating in the vertical direction. In addition, a rectangular protrusion 28b is provided at the upper end, which is one end of the movable contact base 28, and the protrusion 28b is formed on the upper surface of the case 22 when the movable contact 28 moves upward. It projects from the upper and outer side surface of the case 22 through the hole 22b, and when the movable contact base 28 moves downward, the movable contact base 28 is sunk into the through hole 22b.

A cover member 36 of the latch device 35 is attached to the outer surface of the case 22, on which the protrusion 28b of the movable contact base 28 projects, that is, the upper outer surface. The cover member 36 has a flat rectangular box shape with an open lower surface, and has bent pieces 37 on both sides inside thereof.
A plate-like slider 37 having a is disposed so as to be capable of reciprocating in the left-right direction between the release position shown in FIG. 3 and the latched position shown in FIG. Bending pieces 3 on both sides of the slider 37
A roller shaft 38 is attached between 7a and 37a. As shown in FIG. 2, the roller shaft 38 is provided with a roller, such as a ball bearing 39, which is located in the center of the roller shaft and constitutes a pressing portion. Rollers 40 are provided on both sides of the ball bearing 38.

The ball bearing 39 is made of metal, and its inner race 39a is fitted on the roller shaft 38 and the outer race 39b is rotatable as shown in FIG. 6, and is movable as will be described later. Contact board 28
It is adapted to roll while contacting the projection 28b. On the other hand, the roller 40 is made of plastic,
The outer diameter of the ball bearing 39 is slightly larger than that of the outer race 39b. Therefore, although the roller 40 is in contact with the upper outer side surface of the case 22, the outer race 39b of the ball bearing 39 is slightly raised from the upper outer side surface of the case 22, and when the slider 37 moves, the roller 40 moves to the case 22. Rolls while touching the outer surface of the.

Two ball bearings 41 as rollers are provided on both sides of the slider 37, and two small screws 42 are provided as fitting shafts for the inner races 41a. Outer race 41b of this ball bearing 41
Has a slight gap with the inner side surface of the cover member 36, but if the slider 37 rattles in the lateral direction during its movement, the slider 37 comes into contact with the inner side surface of the cover member 36 and rolls. Guarantees the smooth movement of 37.

The roller shaft 38 and the cover member 36
A tension coil spring 43 as an urging means is hung between and, and the tension coil spring 43 urges the slider 37 in the direction of arrow D, which is one direction. When the protrusion 28b of the movable contact base 28 projects from the upper and outer surface of the case 22, the ball bearing 39 is locked by the protrusion 28b, so that the slider 37 resists the elastic force of the tension coil spring 43. And is stopped at the release position shown in FIGS. In this state, the protrusion 2
When 8b is submerged in the through hole 22b, the slider 37 moves in the direction of the arrow D by the elastic force of the tension coil spring 43, and its tip comes into contact with the inner side surface of the cover member 36 so that the slider 37 is at the latch position shown in FIG. Stop. At the latched position of the slider 37, the ball bearing 39 is located on the protrusion 28 b of the movable contact base 28.

The cover member 36 and the slider 37 are provided with holes 36a and 37b for allowing the protrusion 28b to be manually pressed, and the slider 37 is manually latched to the latch position. An operation piece 37c for returning from the release position to the release position is provided.

The case 22 is provided at the right end of the cover member 36.
A frame 44 facing the right side surface of the frame 44 is connected, and a lever 45 is arranged inside the frame 44. The frame 44 is extended downward from the cover member 36 at a right angle. As shown in FIG. 5, the lower end portion of the lever 45 has a pair of support pieces 45a, 45a.
a is provided, and the support pieces 45a, 45a are rotatably supported by a shaft 46 as a support member provided between the pair of support pieces 44a, 44a at the lower end of the frame 44. Further, a pair of connecting pieces 45b, 45b are provided on the upper end portion of the lever 45.
45b is a pair of support pieces 37d at the right end of the slider 37,
It is connected to a connecting pin 47 as a connecting member provided between 37d. The support pieces 37d, 37d are extended portions of the bent pieces 37a, 37a.

A solenoid type trip coil 48 as an electromagnetic device for tripping is arranged on the frame 44, and a fixed iron core 49 is provided at the back of the hollow portion at the center thereof. A fixed iron core 49 is attached to the lever 45.
The movable iron core 50 is provided opposite to the movable iron core 50. When the tripping coil 48 is energized, the movable iron core 50 is attracted by its magnetic force to rotate the lever 45 in the arrow E direction.
The lever 45, the trip coil 48, and the like as described above constitute the trip mechanism 51.

An operating piece 52 is connected to the lever 45. The operation piece 52 reciprocates in the left-right direction in conjunction with the reciprocating rotation of the lever 45, and operates the switch device 53 arranged outside the frame 44. Switch device 5
3 includes an off-delay contact, and the coil 32 of the electromagnetic contactor 21 is energized via the off-delay contact of the switch device 53. Further, the trip coil 48 is one of the switches 34 that are turned on / off by the projecting piece 28a of the movable contact base 28 (this is indicated by reference numeral 34 in FIG. 5).
(indicated by a). The remaining switch 34 is used for detecting ON / OFF of the contact.

The slider 37, the lever 45 and the trip coil 48 as described above are divided into a center line C5 that bisects the slider 37 in a direction orthogonal to the moving direction thereof and the lever 45, as shown in FIGS. The slider 3 of the lever 45 and the portion between the pair of support pieces 44a, 44a that is the center of rotation.
7 so that the portion between the connecting pieces 44b, 44b, which is a connecting portion to 7 and the center line C6, C7, C8 that bisects the trip coil 48 in the direction orthogonal to the rotation direction of the lever 45 are on the same plane. It is arranged. Where the lever 45
Is symmetrical with respect to the direction (width direction) orthogonal to the rotation direction, the center lines C6 and C7 are the same as the lever 45.
Coincides with the center line Cc in the width direction.

Therefore, as shown in FIG. 1, the cover member 3
6, a rectangular display window 54 is formed at the right side of the hole 36a in the figure. Then, as shown in FIG. 2, a label 55 is adhered to two portions of the slider 37 which face the display window 54 at the release position and the latch position. Here, the label 55 is divided into two colors, for example, green and red. The green portion 55a faces the display window 54 at the release position, and the red portion 55b faces the display window 54 at the latch position. ing.

Next, the operation of the above configuration will be described. Figure 3 now
As shown in FIG. 4, the contactor of the electromagnetic contactor 21 is in the off state, the movable contactor base 28 is pushed up by the return spring 29, and the protrusion 28b thereof protrudes from the upper and outer side surfaces of the case 22. It is assumed that the slider 37 of is in the release position. At this time, since the green portion 55a of the label 55 faces the display window 54, the green portion 55a can be seen through the display window 54, so that the slider 37 is in the release position, and thus the electromagnetic contactor 21 is in the off state. It is obvious that there is in.

In this state, if the coil 32 is energized via the switch device 53, the movable iron core 30 is attracted by the fixed iron core 33, and as shown in FIG. The movable contact 27 is brought into contact with the fixed contacts 25 and 26 (contact on) by moving downward against the elastic force of the contact. The switch 34 is turned on by the downward movement of the movable contact table 28. By taking out the ON state of the switch 34 as a signal,
The remote operator can know that the electromagnetic contactor 21 has been turned on.

On the other hand, when the movable contact base 28 descends, the projection 28b is sunk in the through hole 22b, so that the ball bearing 39 is disengaged, and the slider 37 is pulled by the elastic force of the tension coil spring 43, so that the arrow D Move in the direction.
At this time, the outer race 39 of the ball bearing 39
b rolls while contacting the protrusion 28b. Then, when the slider 37 moves to the latched position and stops, the ball bearing 39 is positioned immediately above the protrusion 28b.

The movement of the slider 37 in the direction of arrow D causes the lever 45 to rotate about the shaft 46 in the direction opposite to the direction of arrow E. Then, the operation piece 52 moves in the direction of arrow F in conjunction with the rotation of the lever 45 to operate the switch device 53. As a result, the delay device of the switch device 53 operates to turn off the off-delay contact after a predetermined time. When the off-delay contact is turned off, the coil 32 is cut off, and the fixed iron core 33 loses its magnetic attraction force, so that the movable contact base 28 tries to move upward due to the elastic force of the return spring 29. However, since the protrusion 28b is pressed by the ball bearing 39 located immediately above it, the movable contact base 28 is latched in the state of being moved downward, and the contact is kept in the ON state.

When the slider 37 is in the latched position and the contact is held on, the red portion 55b of the label 55 faces the display window 54, so that the red portion 55b passes through the display window 54. Is visible, the user can clearly see that the slider 37 is in the latched position, and thus the electromagnetic contactor 21 is in the ON state.

When the trip coil 48 is energized via the switch 34a in order to turn off the electromagnetic contactor 21, the movable iron core 50 is attracted by the magnetic force of the trip coil 48, so that the lever 45 moves in the direction of arrow E. When the slider 37 is rotated in the direction, the slider 37 is moved in the direction opposite to the arrow D against the elastic force of the tension coil spring 43 and returned to the release position. As a result, the outer race 39b of the ball bearing 39 rolls on the protrusion 29b, moves in the direction of the arrow D, and comes off the protrusion 29b. Then, the movable contact base 28 is pushed up to the original position by the elastic force of the return spring 29,
The movable contact 27 is separated from the fixed contacts 25 and 26 (contact off).

By the return movement of the movable contact table 28 to the original position, the switch 34 is turned off, thereby disconnecting the trip coil 48. Then, although the trip coil 48 loses the magnetic attraction force to the movable iron core 50,
At this time, since the outer race 39b of the ball bearing 39 is locked by the protrusion 28b, the slider 3
7 is stopped in the release position.

As described above, according to this embodiment, the slider 3
Since the color that appears in the display window 54 differs depending on whether 7 is in the latched position or the released position, the electromagnetic contactor 21
It is possible to accurately determine whether it is on or off. In this case, when the slider 37 is in the latched position (the electromagnetic contactor 21 is on), "red" which is generally recognized as a dangerous color appears in the display window 54, and conversely, the slider 37 is in the released position (the electromagnetic contactor). 21), the display window 54 displays "green", which is generally recognized as a safe color, so that it is easier to make a determination and it is possible to reliably prevent an error in the determination. In addition, since the two portions of the slider 37 facing the display window 54 at the latched position and the released position are color-coded by adhering the two-colored labels 55, the color-coding work is performed easily. be able to.

By the way, in the prior art, when the contact of the electromagnetic contactor is returned to the off state, the lever 9 causes the trip coil 1 to move.
The magnetic attraction force of 2 causes the slider 5 to rotate in the direction of arrow B, and this rotational displacement is transmitted to the slider 5 to move the slider 5 in the direction opposite to the direction of arrow A. However, as shown in FIGS. A longitudinal centerline C1 of a shaft 10 that rotatably supports the lever 9, a central line C2 of a trip coil 12 that attracts the lever 9, and a longitudinal center of a connecting pin 11 that connects the lever 9 and the slider 5. The line C3 is offset from the direction orthogonal to the rotation direction of the lever 9, and the center line C3 of the connecting pin 11 is also a center line C4 that bisects the slider 5 in a direction orthogonal to its moving direction. Because they are out of alignment
When the contactor is returned to the off state, the lever 9 and the slider 5 are acted on by a force such as a prying force. Then, the lever 9 does not rotate smoothly, or the slider 5 moves in the cover member 4 in a tilted state so that the slider 5 comes into contact with the cover member 4 and the frictional force at that time causes the slider 5 to move. May not move smoothly.

However, in this embodiment, the slider 3
A center line C5 that bisects 7 in the direction orthogonal to the moving direction.
And a pair of support pieces 44 that are the center of rotation of the lever 45.
center lines C6 and C7 that bisect the portion between a and 44a, the portion between the connecting pieces 44b and 44b that is the connecting portion of the lever 45 to the slider 37, and the trip coil 48 in the direction orthogonal to the rotation direction of the lever 45. Since the slider 37, the lever 45, and the trip coil 48 are arranged so that C8 and the slider 8 are on the same plane, a biasing force for twisting the slider 37 and the lever 45 does not act, and the slider 3
There is no possibility that 7 will move in a tilted state within the cover member 36.

Moreover, even if the slider 37 tilts and moves for some reason, the ball bearing 41 comes into contact with the inner surface of the cover member 36 and rolls, so that smooth movement of the slider 37 is ensured and released. The occurrence of defects can be prevented more reliably.

Further, since the tension coil spring 43 is used as the biasing means for biasing the slider 37 in the direction of arrow D,
Regardless of whether the slider 37 moves to the release position or the latch position, the tension coil spring 43 is not compressed. Therefore, there is no possibility that the tension coil spring 43 will deform so as to bulge outward and come into contact with the cover member 36, and there will be no risk of malfunction.

Thus, in this embodiment, the slider 37
Since there is no possibility of malfunction of the above, there is no possibility that, for example, the slider 37 does not move completely to the latch position or the release position and stops halfway. Therefore, there is no possibility that both the green portion 55a and the red portion 55b of the label 55 will appear in the display window 5, and there is no risk of confusing the determination of whether the label position is the latch position or the release position.

The two parts of the slider 37 facing the display window 54 at the releasing position and the latching position may be painted with different colors so that the two parts are color-coded.

[0039]

As described above, in the electromagnetic contactor latch device of the present invention, the cover member is provided with a window, and the two portions of the slider facing the window at the latch position and the release position are colored differently. As a result, the color seen through the window of the cover member differs between when the slider is in the latched position and when it is in the released position, so it can be accurately determined whether the electromagnetic contactor is on or off. Further, when the two colored labels are adhered to the slider, it is possible to easily perform color coding of the two parts of the slider that face the window of the cover member at the latch position and the release position.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 Cross-sectional view

[Figure 3] Front view in vertical section

[Figure 4] Vertical side view

FIG. 5 is a side view showing a partially cutaway view.

FIG. 6 is an enlarged vertical side view of two types of ball bearings taken along line V-V in FIG.

FIG. 7 is a diagram corresponding to FIG. 3 in a latched state.

FIG. 8 is a side view showing a part of a conventional latch device in a longitudinal section.

FIG. 9 is a side view showing a partially broken view in a state different from FIG.

FIG. 10 is a partial cross-sectional view.

FIG. 11 is a partial vertical sectional side view.

[Explanation of symbols]

21 is an electromagnetic contactor, 22 is a case, 25 and 26 are fixed contacts, 27 is a movable contact, 28 is a movable contact stand, 29 is a return spring, 30 is a movable iron core, 32 is a coil, 33 is a fixed iron core. , 35 is a latch device, 36 is a cover member, 37 is a slider, 39 is a ball bearing (pressing portion), 43 is a tension coil spring (biasing means), 44 is a frame, 45
Is a lever, 46 is a shaft, 47 is a connecting pin, 48 is a coil for tripping (electromagnetic device for tripping), 49 is a fixed iron core, 5
Reference numeral 0 is a movable iron core, 51 is a tripping mechanism, 54 is a display window (window), 55 is a label, 55a is a green part, and 55b is a red part.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sakae Kodama 2121 No. Osamu, Asahi-machi, Mie-gun, Mie Prefecture

Claims (2)

[Claims] 1. An electromagnetic device having a movable contact base for opening and closing a contact inside a case, and one end of the movable contact base protruding and retracting with respect to an outer surface of the case according to its operation displacement. A latch device for an electromagnetic contactor, which is provided in a contactor and latches the movable contact table in the retracted state when the movable contact table moves in the retracted direction, wherein one end of the movable contact table of the case is And a cover member provided on the outer surface on which the movable contactor is projected and retracted, and reciprocally movable inside the cover member between a release position and a latch position, and is locked to the movable contactor when the movable contactor base is projected. And a slider located at the release position, an urging means for moving the slider from the release position to the latch position when the movable contact base is retracted, and a slider provided on the slider for moving the slider at the latch position. A pressing portion for pressing one end of the tentacle base to latch the movable contactor in the retracted state, and an electromagnetic device are provided. The magnetic force of the electromagnetic device latches the slider against the urging force of the urging means. A tripping mechanism for moving from the position to the release position, the cover member is provided with a window, and two portions of the slider facing the window at the latch position and the release position are colored differently. Characteristic electromagnetic contactor latch device. 2. A label colored in two colors is adhered to the slider so that different colors are applied to two portions of the slider facing the window at the latched position and the released position, respectively. The latch device for an electromagnetic contactor according to claim 1.