JPS6324286B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application) The present invention relates to an electromagnetic relay that turns on and off by alternately reversing and swinging a centrally supported swinging card using a current passed through a coil.

(Problems with the Prior Art) This type of electromagnetic relay has a pair of movable and fixed contacts arranged on the left and right sides of a swing card, and when one is on, the other is turned off.

Therefore, when one switch is turned on, there is a risk that the other switch will turn on. This occurs when the on-contact beyond that point has contact welding.

(Objective) The present invention has been made in view of the above points, namely, when turning on the movable contact plate, sufficient deflection can be obtained without impairing its spring properties, and when turning off the movable contact plate, sufficient deflection can be obtained without impairing its spring properties. The purpose is to overcome the initial welding of contacts by attenuating the elasticity to some extent and reducing deflection.

(Example) The present invention will be described below based on the drawings as an example. Reference numeral 1 denotes a case, which is composed of a base 2 made of an insulator and an upper lid 3. Note that synthetic resin is used as the insulator. Reference numeral 4 denotes a winding frame for the coil C, which is formed by integrally molding a winding trunk 5 and flanges 6 at both ends of synthetic resin. Reference numeral 7 denotes an inner hole of the winding drum section 5, through which the yoke 8 is inserted, and both ends 8a of the yoke 8 project upward at the flange section 6. The coil C, the winding frame 4, and the yoke 8 constitute an electromagnet section M. Reference numeral 9 denotes a parallel armature facing front and back to both protruding ends 8a of the yoke 8, and one of the two end magnetic pole surfaces 9a and 9b, which are adhesive surfaces with the protruding ends 8a, is wide. 10 is a plate-shaped permanent magnet that is interposed between both armatures 9 and attracts them. Reference numeral 11 denotes an insulating frame that supports both of the armatures and the permanent magnet 10, including an upper wall 12 along which the armature 9 extends, pillars 13 on both sides through which the armature 9 passes, and the pillar 1.
a horizontal wall 14 that receives and covers the permanent magnet 10 located between the horizontal walls 14 and 3, and a horizontal wall 14 that receives and covers the permanent magnet 10;
An overhanging wall 14a that covers all but one part is integrally formed. Note that the armature 9 to be inserted is a thin plate so as to facilitate insertion and simultaneous embedding. Reference numeral 15 denotes an elastic shaft plate that projects integrally from the center of the insulating frame 11, and is deflected in a direction T perpendicular to the direction R of the reversing motion of the armature 9. The insulating frame 11 is molded from a soft synthetic resin with excellent arc resistance, and the elastic shaft plate 15 is also integrally molded from the same material. Therefore, both armatures 9, permanent magnets 10,
The insulating frame 11 and the elastic shaft plate 15 constitute the swing card section G. Reference numeral 16 denotes a bearing section, which is provided on the base 2. Specifically, the elastic shaft plate 15 has a thinner portion 15b adjacent to the insulating frame 11 and a thicker tip portion 15a in order to improve its bending force, and a gap 16a is created in the adjacent portion 15b correspondingly. At the same time, the tip portion 15a forms both side walls 17 to which it is firmly fixed. Reference numeral 18 denotes movable contact plates located on the left and right sides of this elastic shaft plate 15, which are in contact with the upper wall 12 of the insulating frame 11 of the card section G. Therefore, this movable contact plate 18
A movable contact 19 is provided at the tip, and an L-shaped base piece 18a is fixed to an L-shaped base piece 20a of an L-shaped output terminal board 20. Moreover, this movable contact plate 18 is connected to the insulating frame 11.
The point 22b at which the movable contact plate 18 is pulled away from the point 22a at which the movable contact plate 18 is pressed is closer to the movable contact 19. X is the distance from the base piece 18a to the pressing point 22a, and Y is the distance from the separating point 22b. Therefore, the movable contact plate 18 does not lose its springiness when it is turned on (including the state in which it remains on), and when it is turned off, because it is closer to the movable contact 19, it kills its springiness and reduces the force for separating the swinging card. is 100%
Join the moving contact. 23 is an input terminal board provided with a fixed contact 24, and both contacts 19 and 24 constitute a contact portion S. A partition wall 25 standing upright from the base 2 is formed between the contact portion S, the electromagnet portion M, and the card portion G, thereby causing the arc to break. Further, this partition wall 25 is connected to the bearing portion 1.
It is integrally formed with both side walls 17 of 5. 26 is an excitation terminal plate for the coil C, and the terminal plate 26 is bent into an L shape, with a horizontal piece 26a passing through the flange 6 of the winding frame 4. Each terminal plate 20, 23, 26 passes through the base 2.

(Operation) Next, the operation of the electromagnetic relay of the present invention will be described. In FIG. In this case, the movable contact plate 18 at the other end is pulled apart and turned off.

From this state, when the rocking card G is reversed as shown in (b), the separation point 22b pulls down the contact plate 18 and turns it off.

In this case, since the distances X and Y between the pressing point 22a and the separating point 22b are large, the amount by which the contact plate 18 is bent is small, so that the force acting on the card G is transmitted without loss.

(Effect) As described above, the present invention provides the separation point 2 of the movable contact 18.
2b is mounted on the insulating frame 11 closer to the movable contact than the pressing point 22a, the springiness of the contact plate 18 is not impaired in the on state, and the springiness is attenuated in the off state to reduce the amount of deflection. This has the effect of transmitting the acting force of the swinging card G without any loss and preventing the risk of the left and right contact portions turning on at the same time.

[Brief explanation of the drawing]

Drawings 1 to 8 show one embodiment of the electromagnetic relay of the present invention, in which Fig. 1 is a sectional front view, Fig. 2 is a sectional view taken along the line AA in Fig. 1, and Fig. 3 is a sectional view taken along the line BB. Figure 4 is a cross-sectional side view along C-C, Figure 5 is a side view along D-D, Figure 6 is a side view along E-E, Figure 7 is an exploded perspective view, and Figure 8 is an operating diagram. be. 2... Base, C... Coil, 4... Winding frame, 8
...Yoke, M...Electromagnet section, 9...Amachiya,
10... Permanent magnet, 11... Insulating frame, 15... Elastic shaft plate, G... Rocking card section, 16... Bearing section,
S...Contact portion, 18...Movable contact plate, 19...Movable contact, 21...Protrusion, 22...Groove, 22a...
Pressing point, 22b... separation point.

Claims (1)

[Claims] 1. An electromagnetic section consisting of an insulating base on which an input/output terminal board, a coil excitation terminal board, etc. are suspended from the lower surface, the coil, a winding frame of the coil, and a yoke that extends through the winding frame and projects at both ends. , a swinging card section comprising an armature facing both protruding ends of the yoke, a permanent magnet that attracts the armature, and an insulating frame that supports the armature and the permanent magnet; The movable contact plate has left and right contact parts that turn on and off alternately, and the pressing point and separation point of the movable contact plate are mounted on an insulating frame closer to the movable contact when the separation point is compared to the pressing point. Featured electromagnetic relay.