JPH1154008A - Electromagnetic contactor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance durability by a method wherein an upper frame and a lower frame to structure a main body frame can be united and separated in a simple operation, and a construction is improved so that an impact load arising from a release action of an electromagnetic contactor in actual usage is not applied directly to an united joint part of the upper frame and the lower frame. SOLUTION: This contactor is assembled by dividing a main body frame 1 into two, an upper frame 2 in which a contact part 4, 5 and a moving core 7 of an electromagnet are assembled and a lower frame 3 in which a fixed core 8 of the electromagnet and a coil 9 assembled, and by uniting the upper frame 2 and the lower frame 3. In this case, as the upper frame 2 and the lower frame 3 are fitted together by a spigot jointing method, both are jointed with a click by a locking nail 3c and a locking hole 2c, and a mounting flange parts 2d, 3d with screw holes, which extend sideward from a lower rim of the upper frame 2 and a base plate of the lower frame 3 and are overlapped vertically each other, are provided to mount them by screwing onto a mating mounting plate 13 by penetrating a fastening screw 12 through the flange part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic contactor, and more particularly, to an assembling structure of a body frame incorporating a contact portion and an electromagnet for driving a contact.

[0002]

2. Description of the Related Art First, a conventional structure of an electromagnetic contactor shown in FIG. In the drawing, reference numeral 1 denotes a main body frame (resin molded product) of an electromagnetic contactor having a two-part structure in which an upper frame 2 and a lower frame 3 are combined and assembled. A contact support frame 6 holding the movable element 5 and the movable contact 5 and a movable core 7 of a contact driving electromagnet connected to the contact support frame 6, and a fixed core 8 and a coil 9 are incorporated in the lower frame 3. ing. Reference numeral 10 denotes a return spring of the movable iron core 7.

Here, upper frame 2 and lower frame 3
Flange portions 2a projecting to the side
A main frame 1 is assembled by screwing the flanges 2a and 3a between the upper and lower frames 2 and 3 with screws 11 with the upper and lower frames 2 and 3 combined. FIG. 4 is an exploded view of the assembly of the upper frame 2 and the assembly of the lower frame 3, and FIG. 5 is a view showing the operation of combining and separating the upper frame 2 and the lower frame 3 using a driver. ing.

The lower frame 3 also serves as a mounting base for the electromagnetic contactor, and through a mounting screw 12 through a mounting flange 3b having a screw hole protruding left and right from the bottom to a mounting plate (distribution panel, It is fixed to a mounting rail 13 of an electromagnetic contactor provided on a control panel or the like. The opening / closing operation of the electromagnetic contactor is well known. When the coil 9 is energized, the movable iron core 7 is attracted downward, and the movable contact 5 and the fixed contact 4 come into contact with each other to turn on the electromagnetic contactor. Becomes Further, when the energization of the coil 9 is stopped, the movable iron core 7 moves upward by the spring force of the return spring 10, the fixed contact 4 and the movable contact 5 are separated, and the electromagnetic contactor is turned off (released).

[0005]

However, the above-mentioned conventional assembly structure has the following problems. (1) When the electromagnetic contactor is released (OFF), the iron support 6b of the contact support frame 6 abuts against the upper wall 2b of the upper frame 2 by the spring force of the return spring 10 and stops. It joins the flanges 2a, 3a connecting the upper frame 2 and the lower frame 3 via the fastening screws 11. For this reason, during long-term use of the electromagnetic contactor,
The impact force accompanying the OFF operation is repeatedly applied to the flange portions 2a and 3a to cause the material to be fatigued, and eventually to cause fatigue failure such as cracking.

Therefore, conventionally, the flange portions 2a and 3a are designed to have a sufficient strength in consideration of the repetition of the impact load described above. For this purpose, the flange portions 2a and 3a are provided on the upper and lower frames 2 and 3, respectively. The protrusion dimensions of 2a and 3a become large, which impairs the appearance design of the main body frame 1 and also hinders downsizing of the electromagnetic contactor.

(2) When performing maintenance such as inspection of the inside of the magnetic contactor and replacement of the coil, the electromagnetic contactor is detached from the mounting plate 13 and the upper frame 2 and the lower frame 3 are connected. The screw 11 needs to be tightened and removed, and the operation takes time and effort. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to solve the above-mentioned problems, and to combine and disassemble an upper frame and a lower frame constituting a main body frame with a simple one-touch operation, and in a state of actual use. It is an object of the present invention to provide an electromagnetic contactor with improved durability by preventing an impact load accompanying the release operation of the electromagnetic contactor from being directly applied to the united joint between the upper frame and the lower frame.

[0008]

According to the present invention, in order to achieve the above object, a main body frame as a resin molded product includes an upper frame incorporating a contact portion and a movable core of a contact driving electromagnet, An electromagnetic contactor that is divided into two parts, a fixed core for an electromagnet and a lower frame also serving as a mounting base incorporating a coil, and an upper frame and a lower frame are fitted in an intaglio style in an electromagnetic contactor assembled by combining the upper frame and the lower frame. In the fitted state, the two are click-coupled, and a mounting flange portion having a screw hole is provided which extends laterally from the lower edge of the upper frame and the base plate of the lower frame and overlaps vertically, and a mounting screw is passed through the flange portion. It is configured to be screwed to the mounting plate on the other side (Claim 1). Configured in such a manner.

(1) A locking claw is provided on the upper edge of the side wall of the lower frame, and a locking hole is provided on the side wall of the upper frame facing the engaging claw.
In a state where the upper frame and the lower frame are combined, the locking claw is hooked on the locking hole, and the two frames are click-coupled (claim 2). (2) A locking claw is provided at a lower end portion of a side wall of the upper frame, and a locking hole is provided on a side wall of the lower frame facing the engaging claw, and the locking claw is locked in a state where the upper frame and the lower frame are united. The frame is hooked on the hole and click-coupled between the two frames (claim 3).

[0010] According to the above construction, the upper frame and the lower frame do not need to be screwed and unfastened to be assembled and separated, and the upper and lower frames can be assembled and separated by one-touch operation simply by hooking and removing the locking claw. Can be performed. In addition, when mounting the electromagnetic contactor on the mating mounting plate such as a switchboard, the mounting flange of the upper frame and the mounting flange of the lower frame are overlapped vertically and fastened together with the fastening screw. A slight play occurs between the locking claw and the locking hole at the engaging portion of the connecting portion. Therefore, an impact force applied to the main body frame due to the release operation of the electromagnetic contactor does not directly apply to the locking claws and the locking holes of the click coupling portion having a small mechanical strength, so that high durability can be secured.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. 1 and 2. In addition, FIG.
FIG. 2 shows an actual use state in which the electromagnetic contactor is assembled and mounted on a mounting plate such as a switchboard. In the drawings of each embodiment, the same members corresponding to FIG. 3 are denoted by the same reference numerals. .

FIG. 1 shows a first embodiment of the present invention.
2 shows an embodiment corresponding to FIG. In this embodiment, a fixed iron core and a lower frame (resin molded product) 3 incorporating a coil are fitted in an intaglio manner inside an upper frame (resin molded product) 2 incorporating a contact portion and a movable iron core. ing. Here, locking claws 3c projecting outward are formed on the upper edges of the left and right side walls of the lower frame 3, and engaging with the lower side wall of the upper frame 2 is opposed to the locking claws 3c. A blind hole (square hole) 2c is open. Then, the upper frame 2 is fitted into the lower frame 3 from above, and is further pushed in by applying force.
c is hooked into the locking hole 2c, and the upper and lower frames 2 and 3 are click-coupled to each other.
And coalesce.

The lower frame 3 also serves as a mounting base.
3 is provided with a mounting flange portion 3d having a screw hole protruding laterally from the bottom plate in the same manner as in the configuration of FIG. A mounting flange portion 2d with a screw hole protruding laterally so as to overlap with is provided. When the electromagnetic contactor is mounted on the mounting plate 13 provided on a switchboard or the like, the flanges 2d and 3d are screwed through the fastening screws 13 so that the flanges 2d and 3d are closely attached and fastened together, On the other hand, the above-mentioned locking claw 3c
And the locking hole 2c are slightly separated from each other, so that a play gap g is generated. Therefore, in the state shown in the figure, the impact force applied to the upper frame 2 in accordance with the release operation of the electromagnetic contactor (the movable iron core 7 that returns to the release position by receiving the spring force of the return spring 11) and the contact support frame 6 are attached to the upper frame 2. The impact force received when struck) is not directly applied to the click coupling portion between the locking claw 3c and the locking hole 2c, so that even if the electromagnetic contactor is repeatedly turned on and off, the click coupling portion is fatigued and broken. There is no danger of occurrence.

The locking claw 3c and the locking hole 2c are arranged such that the main body frame 1 is positioned with reference to the overlapping position of the flange portions 2d and 3d.
Are set in advance so that the play gap g is generated in a state where the screw is screwed to the mounting plate 13.
In this case, in an assembled state where the upper frame 2 and the lower frame 3 are united by engaging the locking claws 3c with the locking holes 2c, the spring force of the return spring 11 is applied between the upper frame 2 and the lower frame 3. Therefore, the click coupling portion does not rattle.

At the time of maintenance such as inspection of the inside of the electromagnetic contactor and replacement of the coil 9 incorporated in the lower frame 3, the electromagnetic contactor is detached from the mounting plate 13, and the locking claw is provided from outside the main body frame 1. The upper frame 2 and the lower frame 3 can be separated by a simple one-touch operation by pushing the 3c inward and releasing the engagement with the locking hole 2c. Moreover, FIG.
Since there are no projecting portions of the flange portions 2a and 3a as shown in (1), the appearance design of the electromagnetic contactor is neat and compact.

[Embodiment 2] FIG. 2 shows an application embodiment of the present invention corresponding to the first and third aspects. In this embodiment, a slit-shaped groove is formed in the base of the mounting flange portion 2d of the upper frame 2 so that the lower frame 3 fits into the outside of the upper frame 2 in an intaglio manner through this groove. Further, locking holes 3e are opened on the left and right side walls of the lower frame 3, and locking claws 2e are provided at lower portions of the side walls of the upper frame 2 so as to face the locking holes. Then, in a state where the upper frame 2 and the lower frame 3 are united, the locking claw 2e is hooked on the locking hole 2e and click-coupled. The other structure, the manner of combining the upper frame 2 and the lower frame 3, the disassembling operation, and the manner of mounting on the mounting plate 13 are basically the same as those in FIG. 1.

[0017]

As described above, according to the structure of the present invention, the following effects can be obtained as compared with the conventional assembly structure of an electromagnetic contactor. (1) As means for connecting the upper frame and the lower frame,
The adoption of a click-coupling structure based on the engagement between the locking claw and the locking hole allows the main body frame to be combined and separated with a simple one-touch operation without the need for troublesome screw operation. In addition to the ease of assembly and maintenance work, the number of parts required for the joint can be reduced, and costs can be reduced.

(2) In addition to the above-mentioned click coupling structure, a mounting flange portion is provided which projects laterally from the lower end portions of the upper and lower frames and overlaps with each other. With the configuration in which the mounting flanges are fastened together, in the actual use state, a slight play occurs in the hooking portion between the locking claw and the locking hole of the click coupling portion, so that the release operation of the electromagnetic contactor is performed. The accompanying impact force is not directly applied to the click joint, thereby improving the durability of the body frame.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the configuration of an electromagnetic contactor according to an embodiment of the present invention.

FIG. 2 is a sectional view of a configuration of an embodiment different from FIG.

FIG. 3 is a sectional view showing the structure of a conventional assembly structure of an electromagnetic contactor.

FIG. 4 is an exploded perspective view of an upper frame and a lower frame in FIG. 4;

FIG. 5 is a diagram showing the state of the unifying and separating work of the upper frame and the lower frame shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body frame 2 Upper frame 2c Locking hole 2d Mounting flange 2e Locking claw 3 Lower frame 3c Locking claw 3d Mounting flange 3e Locking hole 4 Fixed contact 5 Moving contact 7 Movable core 8 Fixed iron 9 Coil 11 Return spring 12 Fastening screw 13 Mounting plate

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yutaka Nakamura 1-1 1-1 Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Katsuaki Watanabe 1st Tanabe Nitta, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture No. 1 Fuji Electric Co., Ltd.

Claims (3)

[Claims] 1. A main body frame as a resin molded product is divided into an upper frame incorporating a contact portion and a movable core of an electromagnet for driving a contact, and a lower frame also serving as a mounting base incorporating a fixed core of an electromagnet and a coil. Split into two,
In an electromagnetic contactor assembled by assembling an upper frame and a lower frame, the upper frame and the lower frame are click-coupled to each other in a state where the upper frame and the lower frame are fitted in an intaglio manner, and the lower edge of the upper frame and the lower frame are connected. An electromagnetic contactor characterized in that a mounting flange portion having a threaded hole which extends laterally from a base plate and which is vertically overlapped is provided, and a mounting screw is passed through the flange portion and screwed to a mounting plate of a mounting partner. 2. The electromagnetic contactor according to claim 1, wherein a locking claw is provided on an upper edge of a side wall of the lower frame, and a locking hole is provided on a side wall of the upper frame facing the engaging claw. An electromagnetic contactor characterized in that the locking claw is hooked on the locking hole and the two frames are click-coupled in a state where the two are combined. 3. The electromagnetic contactor according to claim 1, wherein a locking claw is provided at a lower end of a side wall of the upper frame, and a locking hole is provided in a side wall of the lower frame facing the engaging claw. An electromagnetic contactor characterized in that the locking claw is hooked on the locking hole and the two frames are click-coupled in a state where the two are combined.