JP3266210B2 - Electromagnetic switchgear - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic switching device such as an electromagnetic contactor or an electromagnetic relay to which an additional contact device can be added if necessary.

[0002]

2. Description of the Related Art An electromagnetic switchgear of this kind can be used without an additional contact device, but it is necessary to attach an additional contact device of various contact arrangements prepared in advance so that they can be combined as required. . However, there are special specifications required for this additional contact device in addition to those provided as a standard.In such a case, the additional contact device can be removed and used only with the switchgear itself, or combined with other additional contact devices. Can not be used. Therefore, in such a case, in the past, a nameplate stating that fact was pasted,
Attachment of a sealing sticker at the boundary between the additional contact device and the switchgear body has prohibited the removal .

[0003]

However, it is unavoidable that the additional contact device is erroneously removed from the nameplate or the sealing seal, and an abnormality such as inoperability occurs when the main body is used as it is or in another combination. There was a problem. SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an electromagnetic switching device in which an additional contact device cannot be easily removed once the additional contact device is attached, thereby preventing the additional contact device from being removed from the switching device body due to an error. .

[0004]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention relates to a method of engaging one with another by sliding from one direction.
The power to which the additional contact device is attached via the mating connection
In a magnetic switching device, a frame of the electromagnetic switching device,
Of the additional contact device attached to this electromagnetic switchgear.
Has elastic projections that protrude like a tongue between the frame
Push the locking piece while deforming the elastic projection,
The elastic projection restored from the deformation and the extension contact device
And the locking device is engaged with the electromagnetic opening and closing device.
Attach so that you can not remove unless you remove the parts
At the same time, the lock of the additional contact device is
Lock the slide in the direction opposite to the mounting direction, and
It is intended to prevent inadvertent removal of the contact device .

[0005]

[Function] The lock piece locks the movement of the extension contact device in the removal direction, and the electromagnetic lock device is mounted once the lock piece itself is attached.
The additional contact device can not be removed unless the component is removed, so that the additional contact device is not accidentally removed from the switch body.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention in an electromagnetic contactor will be described below with reference to FIGS. Here, FIG. 1 is a longitudinal sectional view of an electromagnetic contactor to which an additional contact device is attached,
2 is a perspective view of the lock piece in FIG. 1, FIG. 3 is an exploded perspective view of FIG. 1, and FIG. 4 is a side view illustrating a method of attaching the additional contact device to the electromagnetic contactor body. First, in FIG. 1, a fixed core 2 of an electromagnetic contactor 1 is fixed to a lower frame 3, and a contact support 6 slidably guided by an upper frame 5 is connected to a movable core 4 opposed to the fixed core 2. Electromagnetic coil 7 and movable core 4 mounted on stationary core 2
The back spring 8 is interposed between the two. A movable contact 9 is inserted into the contact support 6, and the contact spring 1
It is held by 0. The fixed contact 11 is fixed to the upper frame 5 so as to face the movable contact 9, and the movable contact 9 and the fixed contact 11 are covered with a contact cover 12.

On the other hand, a movable contact 16 is inserted into a sliding frame 15 slidably guided by a frame 14 of the additional contact device 13 and held by a contact spring 17. A fixed contact 18 is fixed to the frame 14 so as to face the movable contact 16. As will be described later with reference to FIG. 3 , the additional contact device 13 is attached to the head of the electromagnetic contactor 1 with the frame 14 fitted into the upper frame 5 as shown in the drawing, and the sliding frame 15 is integrally connected to the contact support 6. Have been. Under such a configuration, the electromagnetic coil 7 is excited and the movable core 4
Is attracted to the fixed iron core 2, the contact supports 6 and the sliding frame 15
Moves to the right in the figure in conjunction with this, and the movable contacts 9 and 1
6 contacts the fixed contacts 11 and 18, respectively. When the excitation of the electromagnetic coil 7 is released, the movable iron core 4 returns to the illustrated state by the force of the back spring 8. Although the electromagnetic contactor 1 and the additional contact device 13 in FIG. 1 are both 1a contacts (one normally open contact), various contact configurations such as adding a b contact (normally closed contact) can of course be employed. is there.

Next, the structure of the connecting portion between the electromagnetic contactor 1 and the additional contact device 13 will be described with reference to FIG. In FIG. 3, a contact support 6 is provided from the upper frame 5 of the electromagnetic contactor 1.
Has a protruding connection groove 6a.
Is provided. The upper frame 3 has a connecting groove 6.
The four inverted L-shaped hooks 19 are provided integrally so as to surround a. Of these hooks 19, the upper two hooks 19 in FIG. 3 are bent upward in FIG.
A stopper surface 19a is formed by the legs, and the lower 2
Each hook 19 is bent in the left-right direction in FIG.
Further, the upper frame 5 has a rectangular recess 5a for retaining.
Is provided. On the other hand, the sliding frame 1 of the extension contact device 13
At the lower end of 5, a connecting protrusion 15a fitted in the connecting groove 6a is provided integrally, and four hooks 20 meshing with the hooks 19 are provided integrally with the frame 14 so as to surround the connecting protrusion 15a. The lower wall of FIG. 3 of the frame 14 is provided with a notch 22 for allowing the hook 19 to escape. Further, the frame 14 is integrally provided with an arm 21 having a claw 21a that engages with the recess 5a.

[0009] In such a configuration of the connecting part, to attach the additional contact device 13 to the electromagnetic contactor 1, the lower side of the hook 20 in FIG. 3 of the additional contact device 13 of the contact support 6 of the electromagnetic contactor 1 head The additional contact device 13 is pressed against the electromagnetic contactor 1 so as to be located on both sides of the portion (the position indicated by the broken line in FIG. 4), and is slid in the direction of the arrow A in FIGS. Accordingly, fitted coupling projection 15a of Nameradowaku 15 to the connecting groove 6a of the contact supporting 6, the mounted state of FIG. 1 in engagement with the hook 19 and the hook 20 at the same time. At this time, the end face 20a of the upper hook 20 in FIG.
, And the claw 21a is elastically engaged with the concave portion 5a to prevent the claw 21a from coming off in the direction of arrow B. To remove the additional contact device 13 from this state, the connecting arm 21 is elastically pulled up to remove the claw 21a from the concave portion 5a, and the additional contact device 13 is moved in the direction of arrow B.
Let me ride.

Here, in FIG. 1, the lock piece 23 is provided so that the additional contact device 13 described above cannot be removed.
Is provided. The lock piece 23 is made of a flexible thermoplastic resin, and has a prismatic main body 23 as shown in FIG.
A pair of left and right tongue-like elastic projections 23b protrude from the front surface of a. A gap is provided around and behind the elastic projection 23b except for a connection portion with the main body 23a, and when the free end is pushed, the elastic projection 21b elastically retracts to the same plane as the front surface of the main body 23a. I have. The lock piece 23 has a contour that fits snugly into the notch 22 of the frame 14 (FIG. 3).

Therefore, in order to attach the lock piece 23 to the electromagnetic contactor 1 to which the additional contact device 13 is attached, the elastic projection 23
while the b down by elastic deformation pushes the lock piece 23 into the notch 22 of the frame 14 from the direction of arrow C in FIG. 3. When the lock piece 23 abuts against the end face 19b of the hook 19 on the lower side of the upper frame 5, the elastic projection 23b climbs over the wall 14a of the frame 14 and the deformation is restored.
a on the back side. As a result, the lock piece 23 is
As shown in FIG. 7, the state is sandwiched between the upper frame 5 and the frame 14.

In the state in which the lock pieces 23 are sandwiched in this way, a slide in the direction of arrow B (the direction opposite to the mounting direction A) for removing the additional contact device 13 from the electromagnetic contactor 1 is performed.
The ride is locked by the locking piece 23. Further, in this state, the lock piece 23 is fitted into the notch 22 without a gap, so that the lock piece 23 itself cannot be removed as it is. Therefore, the additional contact device 13 is not inadvertently removed from the electromagnetic contactor 1. In the case where the additional contact device 13 must be removed by replacement of the contact or the like, the fixed contact 18 on the lock piece 23 side in FIG.
If the elastic projection 23b is deformed from the inside with the tip of a screwdriver or the like, the lock piece 23 can be removed. However, this is a special operation and does not impair prevention of careless removal of the additional contact device 13.

[0013]

As described above, according to the present invention,
Insert a lock between the extension contact device and the electromagnetic switchgear frame.
With the simple configuration of mounting, the careless removal of the extension contact device from the electromagnetic switching device body can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an electromagnetic switching device showing an embodiment of the present invention.

FIG. 2 is a perspective view of the lock piece in FIG. 1;

FIG. 3 is an exploded perspective view of FIG.

FIG. 4 is a side view for explaining a method of attaching an additional contact device to the electromagnetic contactor main body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electromagnetic switching device 5 Upper frame 13 Additional contact device 14 Frame 23 Lock piece 23a Elastic projection

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H01H 50/00-51/36

Claims (1)

(57) [Claims] (1) Meshing with each other by sliding from one direction
The electromagnetic opening to which the additional contact device is attached via the connecting part
In the closing device, a frame of the electromagnetic switching device and the electromagnetic switching device are mounted.
Tongue between the extension contact device frame
The lock tab having the elastic projections extending in a
Push in while deforming, the said restored from the deformation
The elastic projection is engaged with the frame of the additional contact device.
Do not remove the lock piece from the parts of the electromagnetic switch.
If it is attached so that it cannot be removed,
The direction opposite to the mounting direction of the additional contact device by a piece
Lock the slide in the direction of
Electromagnetic switchgear characterized in that it is prevented from being easily removed .