JP2000067678A - Movable contact device for multipolar switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the assembling workability of a movable contact device of a bridged-shape two contact type used for a multipolar switch. SOLUTION: A holder 21 for holding a movable contact 8 is formed integrally with multiple poles (three poles) to be held by a holder support 22 which is engaged with a locking projection 21c by further pushing the movable contact 8 inserted in the holder 21 from one direction and a contact spring 12 from the same direction. Because the holder 21 is formed integral with multiple poles, there is less failure to assemble the movable contact 8 into a switch case. Because the movable contact 8, the contact spring 12 and the holder support 22 are assembled in the holder 21 from the same direction, easy assembling work is achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bridge-type two-contact type movable contact device used for a multipole switch such as a circuit breaker or an electromagnetic contactor.

[0002]

2. Description of the Related Art As this kind of movable contact device, there is one described in Japanese Patent Application Laid-Open No. 6-68771. FIG. 5 is a longitudinal sectional view showing a three-pole switch provided with a movable contact device to the same effect. In FIG. 5, a pair of front and rear fixed contacts 2 and 3 are disposed to face each other in each of three-phase electric circuit spaces defined by partition walls in a mold case 1, and fixed contacts 2 a and 3 a are respectively provided at opposed ends. Are attached, and the fixed contact 2 is integrally formed with the power supply terminal 4. A thermal relay 5 made of bimetal and an electromagnetic trip device 6 are arranged above the fixed contact 3, and the fixed contact 3 is connected to one end of the thermal relay 5. The other end of the thermal relay 5 is connected to one end of a trip device 6, and the other end of the trip device 6 is connected to a load terminal 7.

A movable contact 8 is provided below the fixed contacts 2 and 3.
In the closed state of FIG. 5, the movable contact device 9 having the movable contacts 8a at both ends is provided between the fixed contacts 2 and 3.
8a is bridged by the movable contact 8 that contacts the fixed contacts 2a and 3a. FIG. 6 shows the movable contact device 9 in an enlarged manner. In FIG. 6, the movable contact 8 is inserted and held in an opening 10a extending between the front and rear side walls of the hollow prismatic push button 10, and the push button 10 is opened and closed in the fixed cage 11 for each pole. (In the vertical direction in FIG. 6). The fixed cage 11 has a pair of left and right side walls 11a and a bottom 11 having a hollow prismatic shape with a bottom for integrally connecting these.
b, the push button 10 is guided by the protrusion 11c inside the side wall 11a, and the contact spring 12 inserted between the bottom 11b and the movable contact 8 allows the push button 1 to be guided.
0 is urged in the closing direction of the movable contact 8.

Referring again to FIG. 5, the movable contact device 9 is installed in the mold case 1 as shown in the figure, and is opened and closed by an opening / closing lever 13 located at the center pole portion. The opening / closing lever 13 is rotatably supported by the mold case 1 with the opening / closing shaft 14 as a fulcrum. The opening / closing shaft 14 is driven to be opened and closed by an operating mechanism 15 including an opening / closing mechanism or an operating electromagnet. At the tip of the opening / closing lever 13, a push button 1 with left and right poles
Zero operation bar 13a is integrally formed. Reference numerals 16 and 17 denote arc-extinguishing grids on the power supply side and the load side, respectively.
A commutation plate 8 extends between the arc-extinguishing grids 16 and 17.

In such a switch, the current is supplied from the power supply terminal 4 → the fixed contact 2 → the movable contact 8 → the fixed contact 3 →
It flows through the path from the thermal relay 5 to the trip device 6 to the load terminal 7. When the operation mechanism 15 is operated from this state, the opening / closing lever 13 is driven to rotate clockwise in FIG. As a result, the movable contact 8 is separated from the fixed contacts 2 and 3, and the electric circuit is opened. At this time,
An arc is generated between the fixed contacts 2a, 3a and the movable contact 8a, and this arc receives an electromagnetic driving force in the direction of the arc-extinguishing grids 16,17. The arc is stretched by this driving force and moves between the arc horns 19 and 20 integrally formed on the fixed contacts 2 and 3 and the commutation plate 18 between the contacts 2a and 8a and away from the contacts 3a and 8a.
The arc is extinguished by being divided and cooled in the arc extinguishing grids 16 and 17.

[0006]

In the above-described switch, although the movable contact device 9 has the advantage of being unitized for each pole, it is incorporated into the mold case 1 separately for each pole. Leakage could occur. To assemble each movable contact device 9, a contact spring 12 and a push button 10
After inserting the contact spring 12, the movable contact 8 must be fitted into the opening 10a of the push button 10 from the lateral direction while the contact spring 12 is bent, so that the assembling work is troublesome. SUMMARY OF THE INVENTION It is an object of the present invention to prevent a movable contact device from being leaked and to simplify an assembling operation.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a gate-shaped holder for guiding the movable contact movably in the opening and closing direction by a pair of left and right legs is integrally formed with multiple poles. And a U-shaped holder support is provided facing the holder and slidably disposed outside thereof in the opening and closing direction of the movable contact, and the movable contact is provided between the holder and the holder support. And inserting a contact spring formed on one of the holder and the holder support and a locking surface formed on the other of the holder and the holder support to receive a reaction force from the contact spring. Item 1). According to the first aspect, the holder for holding the movable contact is integrally formed with multiple poles, and the movable contact device of each pole is simultaneously incorporated in the mold case, so that no incorporation leakage occurs.

In this case, the locking projection is provided with an inclined surface along the opening / closing direction of the movable contact, and the holder support is pushed into the holder while being elastically deformed by using the inclined surface. Is preferably engaged with the locking surface (claim 2). According to the second aspect, the movable contact and the contact spring are inserted into the holder from one direction (the opening and closing direction of the movable contact), and the holder support is pushed and mounted from the same direction, so that the assembling work is simplified. .

In the movable contact device, the length of the leg of the holder may be equal to or longer than the stroke of the sole opening of the movable contact due to electromagnetic repulsion. According to the third aspect, a large current such as a short-circuit current flows,
When the movable contact is driven to separate in the holder by the electromagnetic repulsive force, the movable contact is guided by the holder leg over the entire range of the separation stroke and does not come off the holder. Note that the legs of the holder also serve to hold the contact spring from falling down during assembly.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 is a front view of the movable contact device, FIG. 2 is a longitudinal sectional view thereof, FIG. 3 is an exploded perspective view thereof, and FIG. 4 is a longitudinal sectional view of a three-pole switch provided with the movable contact device of FIG. FIG. Note that the same reference numerals are used for portions corresponding to the conventional example, and description of substantially the same components is omitted. First, in FIGS. 1 to 3, a movable contact device 9 of each pole includes a gate-shaped holder 21 having a pair of left and right legs 21 a, a movable contact 8, and a contact spring 12.
And a U-shaped holder support 22. The resin-molded pole holders 21 are connected to each other to form a multi-pole (three-pole) body, and a barrier 23 is provided between the poles.

A groove 21b having a low rising portion at the front and rear edges is provided on inner surfaces of the holder leg 21a facing each other, and a locking projection 2 is formed on an outer surface of a convex tip of the leg 21a.
1c is integrally formed, and an outer surface thereof is provided with an inclined surface that is inclined outward from the bottom to the top along the opening and closing direction of the movable contact 8. A thick operating portion 23a is formed at a part of the upper end of the barrier 23, and this portion is pressed by the opening / closing lever 13 as described later.

The holder support 22 is made of an elastically deformable thermoplastic resin. The U-shaped leg 22a is formed so as to cover the outside of the holder leg 21a loosely, and extends from the U-shaped leg 22a to the U-bent portion. A slit 22b that fits loosely with the locking projection 21c is provided, and a projection 22c for positioning the contact spring 12 is integrally formed on the bottom surface.

The movable contact device 9 is assembled by inserting the movable contact 8 and the contact spring 12 into the holder 21 from below, as shown by a chain line arrow in FIG.
Push in 2 and attach. At this time, the projecting portions 8b projecting to the left and right sides of the center of the movable contact 8 are fitted into the grooves 21b, and are prevented from falling off in the front-rear direction. While the contact spring 12 is guided and held by the groove 21b of the holder leg 21a, the upper end of FIG. 3 is fitted into the projection 8c (FIG. 2) on the lower surface of the movable contact 8. The holder support 22 is pushed right and left by the wedge action of the inclined surface when the U-shaped leg portion 22a is pressed against the locking projection 21c.
c, the engagement surface 22d engages with the engagement protrusion 21c, and receives a reaction force from the contact spring 12.

The movable contact device 9 is incorporated in the mold case 1 of the switch as shown in FIG. 4, and the holder 21 is moved up and down in FIG. It is guided movably in the direction (opening / closing direction). In the closed state shown in FIG. 4, the movable contact 8 is pressed against the fixed contacts 2 and 3 by the contact spring 12, and in this state, the locking projection 21c of the holder 21 and the locking of the holder support 22 as shown in FIG. A gap is formed between the movable contact 8a and the fixed contact 2a, 3a, and an appropriate contact pressure is applied between the fixed contact 2a, 3a and the movable contact 8a. In FIG. 4, an operation bar 13a extending over the left and right operation units 23a is integrally formed at a tip end of the opening / closing lever 13 located at the center pole. Close to each other through a gap.

Now, when the opening / closing lever 13 is rotated clockwise in FIG. 4 around the opening / closing shaft 14 by the operation of the operating mechanism 15, the holder 21 opposes the contact spring 12 via the operating bar 23a. As a result, the movable contact 8 is separated from the fixed contacts 2 and 3 to open the current path. At this time, the holder 21 slides with respect to the holder support 22, and the locking projection 21c descends in the slit 22b. Holder 2
When 1 is pushed down to the lowermost position, the convex tip of leg 21 a fits into the bottom of holder support 22.

On the other hand, when a large current such as a short-circuit current flows through the current path, the movable contact 8 is moved before the operating mechanism 15 drives the opening / closing lever 13 by a command from the tripping device 6 (see FIG. 6). It is driven downward in FIG. 4 by the electromagnetic repulsive force acting between the fixed contacts 2 and 3, and is separated from the fixed contacts 2 and 3. In this case, only the movable contact 8 moves between the legs 21a while bending the contact spring 12 while the holder 21 remains at the closed position. Here, the length of the leg portion 21 a is set to be larger than the stroke when the movable contact 8 separates by the electromagnetic repulsion force so that the movable contact 8 that separates independently does not come off the holder 21. Has become.

In the above configuration, the movable contact 8 is guided and
The holder 21 to be held is integrally formed with three poles, and the movable contact 8 is inserted into the holder 21 outside the mold case 1, so that there is little possibility that the mounting leakage will occur. Further, the movable contact 8 and the contact spring 12 are inserted into the holder 21 from one direction, and the holder support 22 is pushed and mounted from the same direction, so that the assembling work is simple. On the other hand, the holder leg 21a has a sufficient length larger than the single opening stroke of the movable contact 8 due to the electromagnetic repulsion when a large current such as a short-circuit current flows. In this case, there is no fear of detachment from the holder 21 and the contact spring 12 is securely held so as not to fall down during assembly.

[0018]

As described above, according to the present invention, the workability of assembling the movable contact device is improved, the leakage of the movable contact device into the mold case is prevented, and the number of assembling steps can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a movable contact device according to an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of the movable contact device of FIG.

FIG. 3 is an exploded perspective view of the movable contact device of FIG.

FIG. 4 is a longitudinal sectional view of a multi-pole switch provided with the movable contact device of FIG. 1;

FIG. 5 is a longitudinal sectional view of a multi-pole switch showing a conventional example.

FIG. 6 is an enlarged view of the movable contact device in FIG. DESCRIPTION OF SYMBOLS 2 Fixed contact 3 Fixed contact 4 Power supply side terminal 7 Load side terminal 8 Movable contact 9 Movable contact device 12 Contact spring 13 Opening / closing lever 14 Opening / closing axis 15 Operating mechanism 16 Arc extinguishing grid 17 Arc extinguishing grid 18 Commutation plate 21 Holder 21a Leg 21c Locking projection 22 Holder support 22d Locking surface

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsunori Kuboyama 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki, Kanagawa Prefecture Inside Fuji Electric Co., Ltd. (72) Inventor Tatsunori Takahashi 1, Tanabe Nitta, Kawasaki-ku, Kawasaki, Kanagawa No. 1 Fuji Electric Co., Ltd. (72) Inventor Naoji Uchida 1-1, Tanabe Nitta, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Fuji Electric Co., Ltd.

Claims (3)

[Claims] 1. A movable contact for bridging a pair of front and rear fixed contacts arranged opposite to each other for each pole, and the movable contact is pressed by the fixed contact by a contact spring and each pole is contacted. A movable contact device of a multi-pole switch that closes an electric circuit and is opened against the contact spring by an opening / closing lever that is rotated by an operating mechanism when the electric circuit is opened to be separated from the fixed contact. A gate-shaped holder for guiding the movable contact movably in the opening and closing direction by a pair of left and right legs is integrally formed and provided, and a U-shaped holder support is opposed to the holder, and The movable contact and the contact spring are inserted between the holder and the holder support so as to be slidable in the opening and closing direction of the movable contact. A movable contact device for a multi-pole switch, wherein a reaction force is received by engaging a locking projection formed on one of the holder and the holder support with a locking surface formed on the other. . 2. The locking projection is provided with an inclined surface along the opening / closing direction of the movable contact, and the holder support is pushed into the holder while being elastically deformed by using the inclined surface, and the locking projection is inserted into the holder. The movable contact device for a multi-pole switch according to claim 1, wherein the movable contact device is adapted to engage with the locking surface. 3. The multi-pole opening / closing device according to claim 1, wherein the length of the leg portion of the holder is longer than the stroke of the single contact opening of the movable contact due to electromagnetic repulsion. Movable contact device of the vessel.