JP2005276460A - Electromagnetic switching device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a few changes to a contact holder incorporated into the body case of an electromagnetic switching device that deals with the option of adding an auxiliary contact unit or the like, thereby preventing dust or the like from entering the case, and preventing operating errors during installation of an optional unit. <P>SOLUTION: The electromagnetic switching device comprises a main circuit contact mechanism 12 and an operating electromagnet both incorporated into the body case 11. The auxiliary contact unit 20 (option) installed on a side of the case is operated in conjunction with the main circuit contact mechanism. A dented connection hole 17a formed in the lower side of a contact holder 17 stroked up and down in conjunction with the operating electromagnet is opposed to a window hole 11a cut in a sidewall of the case. A connecting arm 23 protruding from the auxiliary contact unit 20 through the window hole is fitted into the connecting hole in the contact holder and linked to the contact holder. A leg piece 17b extending downwards from the connection hole 17a is provided on a side of the contact holder 17 and fully closes a gap between the window hole 11a in the body case and the contact holder. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to an electromagnetic switching device capable of responding to the expansion of options such as an auxiliary contact unit according to a user's request for electromagnetic contactors, electromagnetic relays, and the like.

As is well known, there are various expansion options for the electromagnetic switching device described in the heading, and one of them is attached to the outer surface of the electromagnetic switching device (side-on) and the main circuit contact mechanism of the electromagnetic switching device. There is known an auxiliary contact unit that is operated in conjunction (see, for example, Patent Document 1).
Next, the conventional structure of the electromagnetic switch corresponding to the extension of the auxiliary contact unit (option) is shown in FIGS. In the figure, 10 is an electromagnetic switch, and 20 is an auxiliary contact unit as an extension option that is used by being attached to the side of the case of the electromagnetic switch 10. Here, the electromagnetic switch 10 has a structure in which a main circuit contact mechanism 12 and an electromagnet for operation thereof are incorporated in a body case 11 in which an upper frame and a lower frame are combined, 13 is a fixed iron core, 14 is a movable iron core, and 15 is an operation arm. A coil, 16 is a back spring, 17 is a contact holder connected to the upper side of the movable core 14, 18 is a movable contact held by the contact holder 17, and 19 is a fixed contact.

The operation of the electromagnetic switch having the above-described configuration is well known. When the operation coil 15 is excited by a closing command, the movable iron core 14 is attracted to the fixed iron core 13, and the contact holder 17 is moved downward to move the movable iron core. The contact 18 contacts the fixed contact 19 and the main circuit contact mechanism 12 is turned on. When the excitation of the operation coil 15 is released from this state, the movable iron core 14 is returned to the release position by the spring force of the back spring 16, and the contact holder 17 is moved upward by this, so that the main circuit contact mechanism 12 is turned off. Operate.
Further, in order to connect the extension contact holding contact unit 20 mounted on the side surface of the electromagnetic switch 10 to the main circuit contact mechanism 12 of the electromagnetic switch 10, as shown in FIG. A depression-like connecting hole 17a is formed, and a vertical rectangular window hole 11a is opened on the side wall of the main body case 11 in alignment with the connecting hole 17a. The connecting hole 17 a moves up and down in the window hole 11 a of the main body case 11 by the vertical stroke operation of the child holder 17.

On the other hand, the auxiliary contact unit 20 has a built-in contact mechanism similar to the main circuit contact mechanism 12 of the electromagnetic switch 10 as described in detail in Patent Document 1, and as shown in FIG. A pair of left and right hooks 22 is provided at 21, and the hooks 22 are engaged with and fixed to a concave groove 11 b formed on the outer surface of the main body case 11 of the electromagnetic switch 10. Further, the auxiliary contact unit 20 is provided with a connecting arm 23 protruding from the contact mechanism (contactor holder) to the inside of the frame, and the auxiliary contact unit 20 is mounted on the main body case 11 of the electromagnetic switch 10 in the main body. The connecting arm 23 is inserted into the connecting hole 17a of the contact holder 17 through the window hole 11a of the case 11 to be connected. As a result, the contact mechanism of the auxiliary contact unit 20 is turned ON / OFF in conjunction with the ON / OFF of the electromagnetic switch 10.
Japanese Utility Model Publication No. 3-69845

By the way, the following problems remain in the electromagnetic switching device having the conventional configuration. That is, as shown in FIGS. 4 and 6, a window for inserting the connecting arm 23 of the auxiliary contact unit 20 from the side into the main body case 11 of the electromagnetic switch 10 and fitting it into the connecting hole 17 a of the contact holder 17. A hole 11a is opened, and the window hole 11a is set to an opening height h corresponding to the vertical movement stroke of the contact holder 17 accompanying the ON / OFF operation of the electromagnetic switch 10. Further, the position of the connecting hole 17a formed in the contact holder 17 is also limited due to the relative restrictions of the movable contact 18 held by the holder and the operation coil 15 located below the contact holder 17, as shown in FIG. Thus, it is formed at the lower end corner portion of the contact holder 17.
Therefore, when the electromagnetic switch 10 is OFF (the electromagnet is released), as shown in FIG. 4, between the window hole 11a opened on the side surface of the main body case 11 and the lower end of the contact holder 17 incorporated in the case. A gap g communicating between the inside and the outside of the case is generated.

  For this reason, in the state where the electromagnetic switch 10 is used alone without adding the auxiliary contact unit 20, foreign matter such as dust enters the case of the electromagnetic switch 10 from the outside through the gap g. There is a risk of malfunction due to adhesion to internal components (contacts, operation coils, magnetic pole surfaces of iron cores, etc.). Further, when the auxiliary contact unit 20 is mounted on the electromagnetic switch 10, the electromagnetic switch 10 is released from the electromagnet and the contact holder 17 is stopped at the raised position in FIG. Since the connecting arm 23 is lowered by its own weight and a step is generated between the connecting arm 17 and the connecting hole 17a of the contact holder 17, the connecting arm 23 may be erroneously inserted into the gap g. is there. In addition, if the electromagnetic switch is operated without noticing this mounting error, the stroke operation of the contact holder 17 is hindered by the connecting arm 23 and does not operate normally, causing a failure.

  The present invention has been made in view of the above points, and an object of the present invention is to provide an electromagnetic switchgear corresponding to an extension option improved so that the trouble can be avoided by merely making a slight change in the shape of the contact holder. Is to provide.

In order to achieve the above object, according to the present invention, a main circuit contact mechanism and an electromagnet for operation are incorporated in a main body case, and an extension option unit mounted on the side of the case is interlocked with the main circuit contact mechanism. A window hole in which a hollow connection hole formed in the lower side surface of the contact holder of the contact mechanism that is connected to the electromagnet for operation and moves up and down is opened on the side wall of the main body case. The connecting arm provided in the extension option unit through the window hole is fitted and linked to the connecting hole of the contact holder,
A leg piece extending downward from the connection hole is provided on a side surface of the contact holder, and the leg hole closes a window hole opened in the main body case without leaving a gap between the contact piece holder ( Claim 1).
Moreover, in the said structure, the recessed groove which inserts the said leg piece formed in the contact holder holder and guides so that a slide is possible is formed in the side wall inner surface of a main body case.

  According to the above configuration, even when the electromagnetic switching device is used alone, the entire area of the window hole opened in the side surface of the main body case is incorporated in the case regardless of the ON / OFF operation state. It is completely blocked by the leg piece formed to extend to the outside, so that foreign matter such as dust can be prevented from entering the case from the outside through the window hole, and open / close operation failure caused by the entry of foreign matter can be avoided. The product reliability can be improved. In addition, even when an optional unit such as an auxiliary contact unit is added to the electromagnetic switchgear, the problem is that the connecting arm of the optional unit, which was a problem with conventional devices, is incorrectly inserted into the position away from the connecting hole of the contact holder. Can be prevented.

Embodiments of the present invention will be described below based on the examples shown in FIGS. 1A and 1B and FIG. That is, the electromagnetic switch 10 of the illustrated embodiment is basically the same as the conventional structure shown in FIG. 3 and the subsequent figures, but the contact holder 17 of the main circuit contact mechanism 12 incorporated in the main body case 11 is provided on the left and right side surfaces thereof. As shown in FIG. 1 (b), an ear-shaped leg piece 17b extending downward from the position of the connecting hole 17a into which the connecting arm 23 (see FIG. 6) of the extension option unit (auxiliary contact unit 20) is fitted is integrated. Is formed. A concave groove 11c is formed on the inner surface of the side wall of the main body case 11 so as to face the leg piece 17b so as to be fitted so as to escape the leg piece 17b and to be slidable in the vertical direction.
Here, when the contact holder 17 moves up and down in the assembled state of the electromagnetic switch 10 shown in FIG. 1A, the leg piece 17b hits the bobbin of the operation coil 15 and interferes. The length is set so as to close the window hole 11a opened in the main body case 11 at the position where the contact holder 17 is raised (the state shown in FIG. 1A).

According to the above configuration, even when the contact holder 17 is stopped at the raised position (electromagnet released state) as shown in FIGS. 1A and 2, the window hole 11 a opened on the side surface of the main body case 11. Is completely closed from the inside by a portion of the connecting hole 17a formed on the side surface of the contact holder 17 and the leg piece 17b extending downward, and the tip of the leg piece 17b is located at the position of the main body case 11 at this position. It fits into a concave groove 11c formed on the inner surface side and is held so as to be slidable in the vertical direction. Therefore, the gap g as described in FIG. 4 does not remain between the window hole 11a and the contact holder 17, thereby preventing foreign matters such as dust from entering the case from the outside. it can.
Further, even when the auxiliary contact unit 20 as an extension option is mounted, the connection arm 23 (see FIG. 6) of the auxiliary contact unit 20 is prevented from being erroneously inserted, and is securely connected to the connection hole 17a of the contact holder 17. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram of the electromagnetic switch which shows the Example of this invention, (a) is a vertical front view of the whole electromagnetic switch, (b) is an external appearance perspective view of the contact holder in (a). Side view of FIG. Vertical side view showing the conventional structure of an electromagnetic switch 3 is a front view of the longitudinal section of Fig. 3 together with an optional auxiliary contact unit. FIG. 3 is an external perspective view of a contact holder incorporated in the main body case of FIG. FIG. 4 is an external perspective view showing the state before the electromagnetic switch shown in FIG. 4 and the auxiliary contact unit mounted on the electromagnetic switch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electromagnetic switch 11 Main body case 11a Window hole 11c Concave groove 12 Main circuit contact mechanism 13 Fixed iron core 14 Movable iron core 15 Operation coil 16 Back spring 17 Contactor holder 17a Connection hole 17b Leg piece 18 Movable contact 19 Fixed contact 20 Auxiliary contact unit (Expansion option)
23 Linking arm

Claims (2)

This is an electromagnetic switching device with a main circuit contact mechanism and an operation electromagnet built into the main body case, and an extension option unit mounted on the side of the case is operated in conjunction with the main circuit contact mechanism. Then, a hollow connection hole formed in the lower side surface of the contact holder of the contact mechanism that moves up and down faces the window hole opened in the side wall of the main body case, and the connection provided in the extension option unit through the window hole In which the arm is fitted in the contact hole of the contact holder and linked to each other,
An electromagnetic switching device characterized in that a leg piece is provided on a side surface of the contact holder so as to extend downward from the connecting hole and close the window hole of the main body case. 2. The electromagnetic switching device according to claim 1, wherein a concave groove into which a leg piece formed on the contact holder is slidably fitted is formed on the inner surface of the side wall of the main body case.

Images