JPH0422522Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a contact drive device for an electromagnetic relay, and more particularly to a contact drive device for driving a movable contact in an electromagnetic relay to open and close a contact portion.

[Background Art] Conventionally, as shown in FIG. 8, this type of contact drive device has a coil 2 mounted thereon and an armature 4 pivoted to a yoke body 3 fixed at a fixed position via a return spring 5. In this drive device, when the yoke body 3 is excited, the armature 4 is attracted to the yoke body 3, and as the armature 4 moves, a movable contact (not shown) is driven. The contacts are opened and closed by the By the way, when the armature 4 is attracted to the yoke body 3, the armature 4 may not be able to separate from the yoke body 3, or there may be a time delay in detaching the armature 4. To solve this problem, Conventionally, a residual plate 9 made of a non-magnetic material was attached to one end of the armature 4, so that even when the armature 4 was attracted to the yoke body 3, a residual plate 9 was attached between the yoke body 3 and the armature 4. A dual plate 9 is interposed to form a gap, thereby allowing the armature 4 to immediately separate from the yoke body 3. However, when the residual plate 9 is attached to the armature 4,
The range of movement of the armature 4 is reduced by the thickness, and the opening/closing distance of the contact is reduced, resulting in a problem that the discharge withstand voltage cannot be increased.

[Purpose of the invention] The present invention was made in view of the above points, and its main purpose is to eliminate the need to use a residual plate and to enable a large stroke of the armature. An object of the present invention is to provide a contact drive device for an electromagnetic relay.

[Disclosure of the invention] Hereinafter, embodiments of the invention will be described based on the drawings. The contact drive device for an electromagnetic relay according to the present invention includes:
An armature 4 is pivotally attached to the yoke body 3 on which the coil 2 is attached via a return spring 5, and the armature 4 is connected to the coil 2.
The coil 2 is arranged to be movable between a position where the coil 2 is energized and attracted to the yoke body 3 and a position where the coil 2 is de-energized and separated from the yoke body 3. is an electromagnetic relay that is opened and closed, and the return spring 5 is connected to the yoke body 3 of the armature 4.
The armature 4 is disposed along the surface opposite to the yoke body 3, and the armature 4 is biased away from the yoke body 3, and the tip of the return spring 5 on the armature 4 side is attached to the front and back surfaces formed on the armature 4. The yoke body 3 is inserted through the through hole 6.
It stands out from the rest.

As shown in FIG.
0 and a case 11, and a contact device A consisting of a movable contact portion and a fixed contact portion and a contact drive device B for driving the contact device A are fixed at fixed positions on the body 10. The contact drive device B includes a yoke body 3 around which a coil 2 is wound, an armature 4 that is movable between a position in contact with the yoke body 3 and a position away from the yoke body 3, and a yoke body 3 that connects the armature 4 to the yoke body 3.
The return spring 5 is pivotally attached to the yoke body 3 and biases the armature 4 away from the yoke body 3 when the yoke body 3 is in a non-excited state. The yoke body 3 is composed of a pair of yokes 22 which are respectively provided to project upwardly from both ends of a base 21, and an iron core 23 which is provided to project upwardly from the center of the base 21. , a coil frame 24 is inserted into the iron core 23. The coil 2 is wound around the coil frame 24, and therefore, when the coil 2 is energized, the yoke body 3 is excited. As shown in FIG. 1, the armature 4 is connected to the yoke body through a return spring 5, and when the coil 2 is in a non-excited state, the spring force of the return spring 5 causes the armature 4 to be disconnected from the yoke body 3. is seperated. That is, the lower fixed end of the return spring 5 is fixed to the lower end of the yoke body 3, and the free end of the upper end is fixed to the armature 4.
The free end of the return spring 5 has a spring force directed away from the yoke body 3. The free end of the return spring 5 extends along the surface of the armature 4 on the opposite side of the yoke body 3, and the return spring is inserted through a through hole 6 formed in the upper end of the armature 4 so as to penetrate from the front and back sides. The distal end portion of 5 protrudes toward the yoke body 3. However, when the coil 2 is excited and the armature 4 is attracted to the yoke body 3, the tip of the return spring 5 protruding from the armature 4 comes into contact with the yoke body 3, and the return spring 5 is pulled out of the armature 4. When the coil 2 is de-energized, the armature 4 is forcefully pulled away from the yoke body 3 by the spring force. That is, since a part of the free end of the return spring 5 protrudes from the armature 4 toward the yoke body 3, a large spring is generated at the position where the armature 4 contacts the yoke body 3, as shown in FIG. Although force is stored, the return spring 5 is bent by coming into contact with the yoke body 3, so if the suction force is made sufficiently large compared to the spring force of the return spring 5, the yoke body 3
and the armature 4 can be brought into close contact with each other. Therefore, the armature 4 can be brought as close to the yoke body 3 as possible, and the stroke of the armature 4 can be made large. A card 26 is disposed on the upper part of the yoke body 3 so as to be movable left and right in FIG. One end of the card 26 is in contact with the armature 4, and the other end is connected to the contact device A. A return spring 25 whose one end is fixed to the yoke body 3 is in contact with the center of the armature 4, and the return spring 25 biases the armature 4 away from the yoke body 3. That is, armature 4
is urged away from the yoke body 3 by both the return spring 5 that connects the armature 4 to the yoke body 3 and the return spring 25 that biases the card 26. In the figure, 15 is a coil terminal.

The contact device A is connected to the contact drive device B configured as described above. The contact device A includes a first movable contact section 30, a second movable contact section 31, and a fixed contact section 40. Each movable contact part 30, 31
are constructed by supporting four movable contact plates 32, 33 by movable contact supports 34, 35, respectively, and the fixed contact section 40 is constructed by supporting four movable contact plates 32, 33 respectively.
A fixed contact plate 41 is supported by a fixed contact support stand 42 at a position corresponding to 3. The fixed contact portion 40 is arranged between the two movable contact portions 30 and 31 in such a manner that the fixed contact plate 41 faces each of the movable contact plates 32 and 33, and the left side in FIG. 6 is the normally closed side movable contact. The right side is a normally open side movable contact plate 33. Each of the movable contact plates 32 and 33 is electrically connected to terminal plates 36 and 37 that protrude below the movable contact supports 34 and 35, respectively.
Further, the fixed contact plate 41 has a terminal plate 43 projecting from the lower surface of the fixed contact support base 42 and electrically connected to each corresponding fixed contact plate 41 .
A pair of through holes 38 are formed in each of the contact support stands 34, 35, and 42, and a pair of connecting rods 27 protruding from the base 21 of the contact drive device B are inserted into the through holes 38. Thus, the contact device A and the contact drive device B are positioned.
In this manner, in a state where the contact device A and the contact drive device B are connected at a predetermined position, each contact support stand 34, 35, 42 and the base 21 of the contact drive device B
A holding groove 51 is formed around the periphery. A fixing band 50 is inserted into this holding groove 51. The fixing band 50 is formed of an elastic member in a substantially U-shape that is open toward the contact drive device B, and both ends of the body piece are connected to the contact drive device B.
The leg piece is bent in a direction away from the body piece, and a locking pawl 52 facing toward the body piece is provided at the tip of the leg piece to protrude toward the inner side of the leg piece. This locking pawl 52 engages with an engagement hole 53 formed in the base 21 of the contact drive device B, thereby fixing the contact device A and the contact drive device B. Furthermore, the fixing band 50 has elasticity, and by bending the body piece as described above, when the contact device A and the contact drive device B are combined, the contact device A and the contact drive device can be connected to each other. Since the elastic force acts in a direction that attracts the device B, the connection between the contact device A and the contact drive device B is ensured. With the contact device A and the contact drive device B combined as described above, one end of the card 26 of the contact drive device B comes into contact with the upper end of the normally closed movable contact plate 32, and the normally open The upper end of the side movable contact plate 33 engages with a pair of square holes 28 and a pair of notches 29 formed in the card 26. However, when the card 26 is located at the right end in FIG. When the card 26 is located at the left end in FIG. 1 in its movement range, the normally closed side movable contact plate 32 is pushed and separated from the fixed contact plate 41, and the normally open side contacts The plate 33 is in contact with the fixed contact plate 41. Therefore, when the coil 2 wound around the yoke body 3 is in a non-excited state, the armature 4 and the card 2
6 is located on the right side in FIG. 1 due to the spring force of the return springs 5 and 25, so that the normally closed side contact plate 32 and the fixed contact plate 41 are closed, and on the other hand,
When the coil is energized, the armature 4 is attracted to the yoke body 3 and the card 26 is positioned on the left side in FIG.
3 and the fixed contact plate 41 are closed.

[Effects of the invention] As described above, in the present invention, the return spring that pivotally connects the armature to the yoke body and urges the armature away from the yoke body is located on the surface of the armature on the opposite side of the yoke body. The tip of the return spring on the armature side protrudes toward the yoke body through a through hole formed in the armature that penetrates the front and back sides, so that when the armature is attracted to the yoke body, When one end of the return spring protruding from the armature comes into contact with the yoke body and bends, a large spring force is accumulated in the direction of pulling the armature away from the yoke body, and this spring force allows the use of a residual plate. This allows the armature to quickly separate from the yoke body without causing any
This has the advantage that the stroke of the armature can be made larger because a residual plate is not required. In addition, in electromagnetic relays that have been used for a long period of time, the open circuit voltage generally decreases due to wear of the iron core head, but this invention can efficiently utilize the spring force stored in the return spring, reducing the decrease in the open circuit voltage as much as possible. Moreover, as mentioned above, the stroke of the armature is large, so the opening and closing distance of the contacts can be made large, and an electromagnetic relay with a large discharge voltage can be provided despite its small size. be.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a sectional view taken along the line X-X in Fig. 1, Fig. 3 is a sectional view taken along the line Y-Y in Fig. 1, and Fig. 4 is a sectional view taken along the line Y-Y in Fig. 1. Fig. 1 is a sectional view taken along the Z-Z line in Fig. 1, Fig. 5 is a bottom view of the same as the above, Fig. 6 is an exploded perspective view of the same as the above, Fig. 7 is an explanatory view of the same as the above, Fig. 8 is a partial side view showing the conventional example. It is a diagram. 2 is a coil, 3 is a yoke body, 4 is an armature, 5 is a return spring, and 6 is a through hole.

Claims (1)

[Scope of utility model registration request] The armature is pivotally attached to the yoke body to which the coil is attached via a return spring, and the armature is arranged to be movable between a position where it is attracted to the yoke body and a position where it is separated from the yoke body. An electromagnetic relay whose contacts open and close in response to movement, and a return spring is disposed along the surface of the armature opposite to the yoke body and urges the armature away from the yoke body. A contact drive device for an electromagnetic relay, in which a tip end of a return spring on the armature side projects toward a yoke body through a through hole formed in the armature and penetrating the front and back sides.