JP2532918Y2 - Electromagnetic contactor - 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 contactor for transmitting the movement of an operating electromagnet to a contact support via a lever.

[0002]

2. Description of the Related Art As this type of electromagnetic contactor, a contact support for holding a movable contact is arranged in parallel with a movable iron core of an operating electromagnet, and the contact support is provided between the movable iron core and a receiving groove of a case. Some are driven by operating electromagnets via levers. FIGS. 3 and 4 show such a conventional electromagnetic contactor. In FIG. 3, an operation electromagnet 2 is housed in a lower case 1, and when an operation coil 3 is excited, a movable iron core 4 is attracted toward a fixed iron core 5. A contact support 7 is arranged in the upper case 6 fitted in the lower case 1 in parallel with the movable iron core 4.
The contact support 7 is guided by an insulating plate 8 provided above the operating electromagnet 2 and the upper case 6 so as to slide in the left-right direction in the figure. Pressed to the right. Reference numeral 10 denotes a movable contact held by the contact support 7, and reference numeral 11 denotes a contact spring that presses the movable contact.

[0003] A receiving groove 6a is formed in the upper case 6, and a contact support 7 is provided between the receiving groove 6a and the movable iron core 4.
And a lever 12 is provided. FIG. 4 shows details of a connection portion between the lever 12 and the movable iron core 4 and the contact support 7. As shown in FIG. 4, a protruding piece 12a is integrally provided at the end of the lever 12 on the movable iron core 4 side so as to project right and left, and a projection 12b is formed at the center thereof. I have. The lever 12 is connected to the movable iron core 4 by loosely fitting the protruding piece 12a into the left and right grooves 13a of the connecting piece 13 connected to the movable iron core 4, so that the lever 12 comes into point contact with the connecting piece 13 via the protrusion 12b. Has become.

In the electromagnetic contactor shown in FIG.
Is excited, the lever 12 is moved by the movable iron core 4 into the receiving groove 6a.
, And the contact support 7 pushed by the lever 12 is driven to the left in the figure, so that the movable contact 10 comes into contact with or separates from a fixed contact (not shown). When the excitation of the operation coil 3 is released, the contact support 7 returns to the state shown in FIG.

FIGS. 5 and 6 show different examples of the conventional electromagnetic contactor. In this example, the projecting piece 14a of the lever 14 is provided on the receiving groove 6a side, and the movable core 15 side of the lever 14 is merely in contact with the movable core 15 via the projection 14b. 3 and FIG. 4.

[0006]

In the prior art shown in FIGS. 3 and 4, the lever 12 is positioned in the axial direction by engagement between the projecting piece 12a and the connecting piece 13. Since 12a is located at the tip of the lever 12, the radius of rotation from the receiving groove 6a to the projecting piece 12a is large. Therefore, the projecting piece 12a when the lever 12 rotates about the receiving groove 6a as a fulcrum
In order to absorb the vertical movement in FIG. 3, a considerably large play is required between the projecting piece 12a and the groove 13a. However, if the play is large, the protrusion L12 shown in FIG.
There is a disadvantage that the arm length up to b easily fluctuates, and the stroke of the lever 12 driving the contact support 7 becomes unstable.

In the conventional example shown in FIGS. 5 and 6,
The positioning of the lever 14 in the axial direction is performed by the
And the lever support surface 7b of the contact support 7. In this case, however, the L2 dimension in FIG. 5, that is, the turning radius up to the protruding piece 14a of the lever 14 having the contact point 7a of the contact support 7 with the lever 14 as a fulcrum is large. 14a and the lever support surface 7b rub against each other, and the abrasion powder generated at that time adheres to the contacts to reduce the contact reliability, and the frictional force becomes unstable.

Accordingly, the present invention eliminates the above-mentioned disadvantages of the conventional device, reduces the axial movement of the lever, suppresses the friction between the lever and the contact support, stabilizes the operation, and improves the contact reliability. It is an object of the present invention to provide an electromagnetic contactor having high performance and long life.

[0009]

According to the present invention, a contact support for supporting a movable contact is arranged in parallel with a movable iron core of an operating electromagnet, and the contact support is provided between the movable iron core and a case. In an electromagnetic contactor driven by an operation electromagnet via a lever between the receiving groove and a receiving groove, a projecting piece projecting in a direction orthogonal to an operation direction of the contact support is provided at an intermediate portion of the lever, and A lever support surface on which the protruding piece is mounted is provided on an opposing surface remote from the receiving groove, and a contact portion is provided near the lever support surface of the contact support for contacting the protruding piece.

[0010]

In the electromagnetic contactor of the present invention, the lever is sandwiched between the receiving groove of the case and the lever support surface of the contact support and is positioned in the axial direction. Because it comes to the same position as the contact portion with the lever, the radius of rotation from the receiving groove to the projecting piece is smaller than that of the conventional configuration (FIG. 3) in which the projecting piece is located at the tip of the lever. There is little play between them. Further, the radius of rotation of the projecting piece to the end surface on the lever supporting surface side with the contact portion with the lever of the contact support as a fulcrum becomes extremely small, and rubbing between the projecting piece and the lever supporting surface hardly occurs.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2 showing the embodiment of the present invention, the same parts as those of the conventional example shown in FIGS. 3 to 6 are denoted by the same reference numerals, and the description thereof will be omitted. 1 and 2, a flat lever support surface 17b facing the receiving groove 6a of the upper case 6 is provided on the left and right sides in proximity to the contact portion 17a of the contact support 17 with the lever 16. The abutment portion 17a is formed in an opposite mountain shape as in the conventional example. On the other hand, the lever 16 is provided with a protruding piece 16b in contact with the lever support surface 17b so as to protrude right and left, and the lever 16 is provided with the receiving groove 6a and the lever support surface 17b as shown in FIG.
b and is positioned in the axial direction.

In such a configuration, since the projecting piece 16b is located at substantially the same position as the contact portion 17a, the projecting piece 16b
The turning radius of the lever 16 up to b
The receiving groove 6a is smaller than the conventional configuration of FIG.
The play required for the lever 16 between the lever and the lever support surface 17b is small. Therefore, the L1 dimension in FIG.
The variation in the length of the arm from the contact portion 16a with the contact support 17 to the protrusion 16c is reduced. Also, the lever support surface 17b of the protruding piece 16b with the L3 dimension in FIG.
Since the rotation radius up to the side end surface (the lower surface in FIG. 1) is extremely small, the protruding piece 16b when rotated about the contact portion 17a as a fulcrum
And the lever support surface 17b is hardly rubbed.

[0013]

According to the present invention, a lever supporting surface is provided so as to approach a contact portion of a contact supporting lever with a lever, and a lever supporting surface facing a receiving groove of a case is provided. With this arrangement, the radius of rotation from the receiving groove to the lever projecting piece is reduced, and the axial play of the lever can be set small. Further, the turning radius of the lever protruding piece to the end surface on the lever support surface side, which is the fulcrum at the contact portion of the contact support with the lever, becomes extremely small, and the contact support and the lever support surface hardly rub against each other. As a result, the drive stroke of the contact supports is stabilized, and wear of the contact supports and levers, poor contact of the contacts due to these abrasion powders, and instability of operation due to frictional force between the contact supports and the levers are eliminated. It is possible to improve the reliability and extend the life of the contactor.

[Brief description of the drawings]

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

FIG. 2 is an enlarged perspective view of a main part of FIG. 1;

FIG. 3 is a longitudinal sectional view showing a conventional electromagnetic contactor.

FIG. 4 is an enlarged perspective view of a main part of FIG. 3;

FIG. 5 is a longitudinal sectional view showing another conventional electromagnetic contactor.

FIG. 6 is an enlarged perspective view of a main part of FIG. 5;

[Explanation of symbols]

 2 Operating electromagnet 6a Receiving groove 15 Moving core 16 Lever 16b Projecting piece 17 Contact support 17b Lever support surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A contact support for supporting a movable contact is disposed in parallel with a movable iron core of an operating electromagnet, and the contact support is driven by the operating electromagnet via a lever between the movable iron core and a receiving groove of a case. In the electromagnetic contactor, a projecting piece projecting in a direction perpendicular to the operating direction of the contact support is provided at an intermediate portion of the lever, and the projecting piece is placed on an opposing surface of the contact support remote from the receiving groove. An electromagnetic contactor comprising: a lever support surface; and a contact portion for contacting the projecting piece near the lever support surface of the contact support.