JPS6346940B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electromagnetic relay.

Conventionally, this type of electromagnetic relay is constructed so that an armature is driven by exciting a coil of a coil block, and a contact spring having a movable contact is directly driven by a card connected to the armature.

When the contact spring has a lift-off configuration, if the contact spring pressure is increased, a large amount of driving force is required, and the contact spring cannot be driven smoothly, resulting in unstable operation. Therefore, in the case of lift-off type contact springs, sufficient contact pressure could not be ensured and reliability could not be improved. Furthermore, when the contact spring has a flexible structure, the minute swing of the armature due to the attraction collision that occurs between the magnetic pole and the magnetic pole is directly transmitted to the contact spring via the card, so that the contact spring can move relative to the fixed contact. There was a problem with the contact points causing chattering.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electromagnetic relay that eliminates the above-mentioned drawbacks, has a sufficiently large contact pressure, and can suppress chattering.

The electromagnetic relay of the present invention will be explained below with reference to the drawings.

1 and 2 show an embodiment of the present invention, in which 1 is a terminal body having a recess 2 in the center, and fixed contact terminals are arranged in pairs on one end side of each side surface. 3 and 4 are implanted, and the upper portions of each of the fixed contact terminals 3 and 4 protrude near one end of each side so as to be spaced apart from each other in the width direction of the terminal body 1 and to face each other. Fixed contacts 5 and 6 are fixedly installed. In addition, the terminal body 1
Coil terminals 7 and 8 are provided at the other end of each side surface of the
are planted with their upper parts projecting upward, and common terminals 9, 9 are planted between the fixed contact terminals 3, 4 and the coil terminals 7, 8 with their upper parts projecting upward. There is. Further, the base ends of a pair of horizontally extending first contact springs 10, 10' and second contact springs 11, 11' are fixed to the upper part of each of the common terminals 9, 9. The first and second contact springs 10, 10', 11, 1
1' are separated from each other and branched into two, and movable contacts 12, 12', 13, 1 are provided on the outer surface.
3' is formed. and the contact spring 10',
The center portion of 11' is protruded so as to approach the contact springs 10, 11.

Reference numeral 14 denotes a hollow coil frame that can be accommodated in the recess 2 of the terminal body 1, around which a coil 15 is wound, and a bar-shaped armature 16 passes through it. It extends from one end. Reference numerals 17 and 17 denote a pair of yokes, each having a substantially concave shape, and one end portion 18, 18 of each is fitted from the outside to the enlarged portion 19 at the other end of the coil frame 14, and is parallel to the armature 16. and are arranged parallel to each other with the armature 16 in between. In addition, the yoke 1
The intermediate portions 7 and 17 bypass the lower side of the coil frame 14, and the other end portions 20 and 20 are spaced apart from the other end of the coil frame 14 and are attached to a retaining wall protruding from the upper surface of one end wall of the terminal body 1. 21 so that it can come into contact with it. A permanent magnet 22 is disposed between the yokes 17, and is magnetized with different poles in the width direction. Reference numeral 23 denotes a holding spring that is fitted to the other end of the armature 16, and has two leg pieces 24, 24 extending in a direction away from the armature 16, and each of the leg pieces 24, 24 is connected to the yoke 17, 1.
The respective one end portions 18, 18 of 7 are pressed against the inner surface thereof. Reference numeral 25 denotes a card loaded on the end of the armature 16 extending from one end of the coil frame 14, and is provided so as to be located between one end of the coil frame 14 and the other ends 20, 20 of the yokes 17, 17. is,
Further, slits 26, 26 are formed on both sides into which the first contact springs 10, 10' and the second contact springs 11, 11' can be inserted, respectively. A cover 27 is mounted on the terminal body 1.

Further, the operation of the above embodiment will be explained. One end of the armature 16 is connected to the yoke 1 with the base end as a fulcrum.
If the contact spring 10 is attracted to one of the other ends 20, 20 of the card 25, as shown in FIG. Since the central protrusion of the contact spring 10' is pressed by the contact spring 10 in the direction opposite to the direction of arrow A, the movable contact 12' of the contact spring 10' contacts the fixed contact 5 with sufficient contact pressure. has been done. Next, when the coil 15 is energized, one end of the armature 16 and the card 25 are
The robot starts moving in the direction of arrow A as shown in FIG.
As the card 25 moves, the contact spring 10 gradually returns to its original position and is separated from the protrusion of the contact spring 10'.
During this time, the movable contact 12' maintains a state in which it is in contact with the fixed contact 5 although the contact pressure gradually decreases, and the movable contact 12 of the contact spring 10 maintains a state in which it is not in contact with the fixed contact 6. Furthermore, when the card 25 is moved in the direction of arrow A, the contact spring 10' is pressed by the card 25 as shown in FIG. It is rapidly and reliably separated from the fixed contact 5 in a reduced state. The contact spring 10 returns, and the movable contact 12 comes into contact with the fixed contact 6 as shown in FIG. 3D. Thereafter, the card 25 continues to move in the direction of arrow A against the contact spring 10', and the state shown in FIG. It is stopped with the contact pressure further increased. As a result, the card 25 is connected to the contact spring 1 at the beginning of the operating stroke.
Since the force in the same direction as the moving direction is received by one of the movable contacts 0 and 10', it is possible to sufficiently eliminate the adverse effects caused by unstable operation of the armature 16 and the card 25 at the initial end of the operating stroke. 1
2' can be reliably and quickly separated from the fixed contact 5. In addition, at the end of the movement stroke, card 2
5 exerts a pressing force on one of the contact springs 10, 10' through the other of the contact springs 10, 10', so that the other end 2 of the yoke 17, 17 of the armature 16 at the end of the operating stroke
It is possible to sufficiently absorb the impact when the contact spring is attracted to the other of the contact springs, and to increase the spring pressure of the contact spring, thereby ensuring sufficient contact pressure. This can prevent chattering.

On the other hand, the card 25 and the contact springs 10, 10'
It will be clear that when the coil 15 is energized in the opposite direction when it is in the state shown in FIG.

In parallel with the above-mentioned operation, the contact springs 11, 11',
It will also be clear that the movable contacts 13, 13' operate in a similar manner.

4 and 5 show another embodiment of the present invention, in which the free ends of contact springs 10, 10' are curved close to each other, and the free ends of contact springs 11, 11' are The ends are curved close together. As is clear from FIGS. 6A to 6E, the card 25 receives a force in the same direction as the movement direction by one of the contact springs 10, 10' at the beginning of the operating stroke, and the contact springs at the end of the operating stroke. A pressing force is exerted on one of the springs 10, 10' through the other, so that the armature 16 and card 2
It is clear that the adverse effects caused by the unstable operation of the device No. 5 can be sufficiently eliminated and sufficient contact pressure can be ensured.

7 and 8 show another embodiment of the present invention, in which the proximal end of the first intermediate spring 10'' is disposed between the proximal ends of the contact springs 10, 10', and one common The enlarged free end fixed to the terminal 9 extends to the center of the contact springs 10 and 10', and the base end of the second intermediate spring 11'' is connected between the base ends of the contact springs 11 and 11'. The enlarged free ends arranged and fixed to the other common terminal 9 extend to the center of the contact springs 11, 11'.
As is clear from Figure 9 A to H, card 25
is the contact spring 10,1 at the beginning of the operating stroke.
0' and the intermediate spring 10'' in the same direction as the moving direction, and at the end of the operating stroke, a pressing force is applied to one through the other of the contact springs 10, 10' and the intermediate spring 10''. Therefore, the first
Similar to the embodiment of the present invention shown in FIG. 2 and FIG. It is clear that this can be ensured.

10 and 11 show another embodiment of the present invention, in which elastic engagers 10 and 11 are integrally formed in the center of each side surface of the terminal body 1, and the elastic engagers 10 and 11 are The free end of the engagement piece 10 is inserted between the center portions of the contact springs 10 and 10', and the free end of the elastic engagement piece 11 is inserted between the contact springs 10 and 10'.
It is inserted between the central parts of 1 and 11'. 12th
As is clear from Figures A to E, the card 25 is subjected to a force in the same direction as the moving direction by one of the contact springs 10, 10' and the elastic engager 10 at the beginning of the operating stroke, and at the end of the operating stroke. Since a pressing force is applied to one of the contact springs 10, 10' through the other and the elastic engager 10 at the first
Similar to the embodiment of the present invention shown in FIG. 2 and FIG. It is clear that this can be ensured.

As is clear from the above, the electromagnetic relay of the present invention is arranged at the tip of the other contact spring by transmitting the spring force of one of the two contact springs to the other at the end of driving by the card. (a) Lift-off type. A contact spring and a flexible type contact spring can be placed side by side, ensuring contact pressure and, in turn, improving contact reliability. (B) Contact chattering can be eliminated. (C) When one contact is welded, the other contact There is no risk of the contacts being closed, and malfunctions can be prevented. (d) The distance between the contacts can be expanded, and the withstand voltage between the contacts can be increased, which achieves remarkable effects.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of one embodiment of the electromagnetic relay of the present invention, FIG. 2 is a cross-sectional view of the same, FIG. 5 is an exploded perspective view, FIG. 6 is an explanatory view of the same operation, FIG. 7 is an exploded perspective view of another embodiment of the present invention, FIG. 8 is a sectional view, 10 is an exploded perspective view of another embodiment of the present invention, FIG. 11 is a cross-sectional view of the same, and FIGS. 12 A-H are explanatory views of the same operation. 1... Terminal body, 2... Recess, 3, 4... Fixed contact terminal, 5, 6... Fixed contact, 7, 8... Coil terminal,
9... Common terminal, 10, 10', 11, 11'... Contact spring, 12, 12', 13, 13'... Movable contact, 1
4... Coil frame, 15... Coil, 16... Armature, 17... Yoke, 18... One end, 19... Ampulla, 20... Other end, 21... Holding wall, 22... Permanent magnet, 23... Holding spring, 24... Leg piece, 25...card, 26...slit, 27...cover.

Claims (1)

[Scope of Claims] 1. A terminal group consisting of a common terminal and a fixed contact terminal implanted in a body, a contact spring whose base end is fixed to the common terminal and whose tip faces the fixed contact terminal, and the contact spring. a contact mechanism including a fixed contact provided on the fixed contact terminal so as to be directed toward the tip; and a movable contact provided on the tip of the contact spring so as to be directed toward the fixed contact; In the electromagnetic relay, the electromagnetic relay includes a coil block that drives the contact spring by excitation of the coil block to cause the contact mechanism to perform a contact opening/closing operation, and the fixed contact terminals are arranged in pairs and are spaced apart from each other and face each other. A fixed contact is provided on each of the contact springs so as to face each other, and the contact spring consists of a set of two parallel contact springs that are joined at the proximal end. An electromagnetic relay characterized in that a tip has a movable contact corresponding to each of the fixed contacts, faces between the paired fixed contact terminals, and is provided with a means for transmitting a mutual pressing force between them. . 2. A means for transmitting mutual pressing force between a pair of contact springs is provided in the center of one of the contact springs,
The electromagnetic relay according to claim 1, wherein the relay is a protrusion provided to approach the other contact spring. 3. The electromagnetic relay according to claim 1, wherein the means for transmitting the mutual pressing force between the two contact springs is a curved portion provided at the tip of both contact springs so as to approach each other. . 4 A means for transmitting mutual pressing force between a set of two contact springs is sandwiched between both contact springs,
The electromagnetic relay according to claim 1, which is an intermediate spring having an enlarged portion at its tip. 5. The electromagnetic device according to claim 1, wherein the means for transmitting mutual pressing force between the pair of contact springs is an elastic engager that protrudes from the body and has its tip inserted between both contact springs. relay.