FR2736201A1 - ELECTROMAGNETIC RELAY - Google Patents

Abstract

The present invention relates to an electromagnetic relay. The electromagnetic relay is characterized in that it comprises a stop means (24a; 24b) which regulates an upward or downward displacement of a support spring (78), which displacement is produced by tilting of a frame (75). The invention finds application in the field of electrical engineering.

Description

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  The present invention relates to an electromagnetic relay of an equilibrium armature system, in particular a polar electromagnetic relay which can

prevent a rebound.

  Traditionally, the relays shown in Figs. 69 to 72 are available as an electromagnetic relay. This type of electromagnetic relay consists of an electromagnet block 62 composed of an iron core 64 having magnetic poles 71, 72 on both sides thereof, on which is wound a coil 69, a permanent magnet 72 , an armature block 73, a casing 51 and a casing 82. The armature block 73 is provided with a frame, an insulating support member 79 fixed under the frame and a movable contact spring 76 attached to the insulating support member 79. The movable contact spring 76 is disposed at the top of a fixed contact junction portion 57 projecting from the bottom of the housing 51. Thus, the frame 75 and the contact spring movable 76 are made in one piece with each other by the insulating support member 79 and the support spring 78 extends from the inside of the insulating support member 79 in the direction perpendicular to the center longitudinal of the movable contact spring 76 and is received and fixed in the side wall 52 of the housing 51. If the coil 69 is energized in a predetermined direction, the armature 75 is caused to reverse switch between the magnetic poles 71, 71 in a one-piece state with the movable contact spring 76 via of the insulating support member 79, centering it around the core of the support spring 78. The respective terminals of the common terminal 58, the fixed contact terminal 56, the coil terminal 60, etc. are provided at the bottom of the casing 51. 82 is an envelope which is fixed outside the casing 51. The frame block 73 and the block

  electromagnet 62 are fixed to the housing 51.

  The housing 51 has a side wall 52 and is roughly like a box, the upper side of which is open. The housing 52 is divided into a receiving chamber

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  coil 53 and an armature receiving chamber 54 by a partition wall 5la and an end of each of the respective terminals of the fixed contact terminal 56, the common terminal 58 and the coil terminal 60, which is formed at a predetermined shape by pressure molding of a conductive thin plate made of copper alloy, etc. are arranged so that they protrude from the bottom of the housing 51 and a group of these terminals is fixed together by insertion of synthetic resin, etc. One end of the fixed contact terminals 56 protrudes from below the housing 51 and the other end thereof is disposed at each of the four corners of the receiving chamber of the frame 54, while a fixed contact 55 made of end or piece of precious metal volume is electrically welded to the upper side thereof to ensure an electrical connection

with the fixed contact terminal 56.

  One end of the common terminal 58 protrudes from below the housing and the end thereof is disposed at the longitudinal center of the side wall of the receiving chamber of the frame 54 and in the center of the partition wall. 51a, thereby the common terminal joint portion 59 is formed. A support spring 78 of the reinforcement block 73 described later is attached to the part of

  joint terminal joint 59 by electric welding.

  One end of the coil terminal 60 projects from below the housing 51 and the other end thereof is provided to protrude from the concave portion of the side wall of the coil receiving chamber 53, the so the coil terminal junction part 61 is

  incorporated. A coil output terminal 68 of the electronics

  magnet 62 described later is attached to the part of

  coil terminal junction 61 by electrical welding.

  The electromagnet block 62 consists of an electromagnet portion 63 and a permanent magnet 72. The electromagnet portion 63 is further composed of an iron core

  64, a coil 69 and coil output terminals 68.

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  The iron core 64 is made of a magnetic substance such as electromagnetic soft iron and is formed to be roughly channel shaped, where a coil body 66 made of a molded element such as a synthetic resin is provided at the intermediate portion. of the latter and a flange 67 made of a molded element such as a synthetic resin is also provided at the end of the coil 66. The two ends of the iron core 64 project towards the side of the flange 67 to constitute a pole

magnetic 71.

  The coil output terminals 68 are made of a conductive metal material, formed to be roughly channel-shaped and respectively provided to protrude from the flange 67. One end of the coil output terminal is attached to the coil portion. coil terminal junction 61 of the housing 51 by electrical welding, so an electrical connection with the coil terminal 60 is realized. A coil 69 is wound on the coil body 66 attached to the intermediate portion of the iron core 64, where the coil output line 70 is attached to the other end of the coil output terminal 68 by welding and is electrically connected to the coil terminal 60 by

  via the coil output terminal 68.

  The permanent magnet 72 is roughly plate-shaped and is magnetized so that two ends thereof are of the same pole and the middle portion thereof is of the other different pole and is made to intervene between the poles. 71, 71 which are the ends of the core

iron 64.

  Figs. 73 to 76 show a conventional armature block 73. The armature block 73 consists of a frame 75, a movable contact 77, a movable contact spring 76, a support spring 78 and a support member

insulation 79.

  The armature 75 is made of a soft magnetic material such as electromagnetic soft iron and is formed to

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  be roughly plate shaped. The movable contact spring 76 is made of a conductive metal material such as a copper alloy thin plate, etc. The movable contact spring 76 is formed in one piece with the frame 75, at the bottom thereof, by an insulating support member 79 made of an insulating material such as a synthetic resin, etc., which is disposed in parallel with the frame 75. A movable contact 77 made of a piece of precious metal by volume is attached to both ends of the movable contact spring 76 by electrical welding, so that it is electrically connected to the common terminal 58

  by a support spring 78 described later.

  The support spring 78 is mechanically and electrically formed in one piece with the movable contact 76, extends from the longitudinal center of the movable contact spring 76 in the direction perpendicular to it and is fixed by electric welding to the part of common terminal junction 59 disposed at the longitudinal center of the armature receiving chamber 54 of the housing 51 and in the center of the partition wall 51a, so a connection with the

common terminal 58 is realized.

  An electromagnetic force acts on the armature 75 by excitation of the coil 69 of the electromagnet block 62. Therefore, if the coil 69 is excited in a predetermined direction, the armature 75 is caused to switch inversely by the magnet. intermediate of the insulating support member 79 with respect to the magnetic poles 71, 71 of the iron core 64 centering it around the support spring 78 in such a state as the movable contact spring 76 and the frame 75

  are made in one piece with each other.

  An envelope 82 is made of an insulating substance such as synthetic resin, etc., and is formed to be roughly box-shaped. The casing 82 is fixed on the outside to the casing 51 in which the frame block 73

  and the electromagnet block 72 are provided.

  The conventional electromagnetic relay of a system

  balance armature has the following problems.

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  In a case where the electromagnetic relay is actuated, a collision occurs between the frame 75 of the frame block 73 and the magnetic pole 71 of the electromagnet block 62, so that impact vibrations are produced at 75. This state is described in detail in

reference to Figure 77.

  (a) represents such a state where the armature 75a is magnetically attracted by a magnetic pole 71a of the electromagnet block 62 and the movable contact 77a is brought into contact with the fixed contact 55a (not shown) in a stabilized state .

  Here, the following description is based on the

  assumption that both ends of the permanent magnet 72 are magnetized to be N poles and the middle portion thereof is magnetized to be a pole S. In a case where both ends thereof are magnetized to be S poles and the middle portion of it is magnetized to be a pole N, the direction of the magnetic flux in the

  following description is completely reversed, but the

  its actions remain identical to the description given above.

  below. Due to the magnetic flux A of the permanent magnet 72 flowing through the armature 75a via the magnetic pole 71a, the armature 75a is magnetically attracted to the magnetic pole 71a, so the armature is retained. stably as shown in Figure 77 (a). Here, if electric current is circulated to the coil 69 so that the magnetic flux flows in the direction of the magnetic pole 71a from the armature 75a, the magnetic flux A of the permanent magnet 72 is counterbalanced or neutralized. by the magnetic flux C (which circulates inside the iron core 64) of the coil 69 between the armature 75a and the magnetic pole 71a, so the magnetic attraction force between the armature 75a and the

  magnetic pole 71a is decreased.

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  Simultaneously, by causing electric current to flow to the coil, the magnetic attraction force between the armature 75b and the magnetic pole 71b, which is produced by the magnetic flux C produced towards the armature 75b of the other magnetic pole 7lb and the oriented magnetic flux B of the permanent magnet 72 to the armature 75b via the magnetic pole 71b is increased, o if this magnetic attraction force exceeds the magnetic attraction force between the armature 75a and the magnetic pole 71a, the armature 75b is attracted to the other magnetic pole 71b to cause the armature 75 to be reversed

(see Figure 77 (b)).

  (b) represents the moment when the armature 75 is inverted by excitation of the coil 69 of the electromagnetic block 62 and the armature 75b is brought into collision with the other magnetic pole 71b. At this time, since the kinetic energy by which the armature 75b is inverted can not be absorbed between the armature 75 and the magnetic pole 71b, impact vibrations are produced at the armature 75. production of these impact vibrations is shown in (c)

and D).

  (c) represents a state where the armature 75a is more dissociated from the magnetic pole 71a by the impact vibrations due to a collision of the armature 75b with the pole

magnetic 7lb.

  (d) represents a state where the armature 75a is drawn near

  magnetic pole 71a, which is the state following that of

above (c).

  Here, the phantom lines shown in (c) and (d) represent a stabilized position of the armature 75 at a state of rest. The impact vibrations are continued, gradually reducing the vibration magnitude of the armature 75 and finally the armature 75 is stabilized and remains at rest at the position represented by the line.

mixed lines.

  Thus, since in a conventional electromagnetic relay the armature 75 is brought into collision with the

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  magnetic pole 71 when the armature 75 is caused to switch inversely by commissioning the relay, impact vibrations are produced transitionally to the armature 75, so the following problems occur. (1) The movable contact spring 76 is made in one piece with the frame 75 by an insulating support member 79 and by energizing the coil 69 of the electromagnet block 62 in operation, the frame 75 is caused to switch inversely and is alternately brought into contact with the magnetic poles 71, 71 of the electromagnet block 62, centered around the support springs 78, 78 which extend from the longitudinal center of the movable contact spring 76 in the orthogonal direction to

this one.

  However, since the armature 75 is collided with the magnetic pole 71, said transient impact vibrations are produced until the armature 75 is stabilized and said impact vibrations are transmitted to the movable contact spring 76 and in the spring of

support 78.

  Fig. 78 is a sectional view of the peripheries of the support spring 78 illustrated in Fig. 77 as viewed from the side thereof and (a), (b), (c) and (d) correspond with each other. others. As can be understood from these drawings, (a) illustrates a stabilized state of the support spring 78, where stabilization is achieved with the end portion of the support spring 78 attached to the upper portion of the connecting portion of common terminal 59 of the housing 51. In (c), since the support spring 78 is moved down and the armature 75 is pulled close to the fixed contact side 55, the amount of deflection of the movable contact spring 76 is increased in comparison to the stabilized state. In (d), on the contrary, since the support spring 78 is moved upwards and the armature 75 is dissociated on the side 55 of the fixed contact, the bending of the movable contact spring 76 is decreased in comparison with

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  the stabilized state. As a result, the contact pressure between the fixed contact 65 and the movable contact 77 is thereby changed, in particular in (d) the contact resistance between the contacts is increased by reducing the contact pressure between the fixed contact 55 and the movable contact 77, and at the same time, in a remarkable case, the contact between the fixed contact 55 and the movable contact 77 is not

  sufficient to cause them to be dissociated from each other.

  Thus, while the armature 75 vibrates by impacts when the electromagnetic relay is operating, a so-called rebound phenomenon occurs, resulting in the intermittent opening and closing of the fixed contact 55 and the movable contact 77. When the deflection of the movable contact 76 is decreased, the contact pressure is also reduced. As a result, the armature 75 is in such a state that it is easily influenced by an external disturbance. For this reason, it is necessary to provide the circuit with some countermeasure in order to prevent erroneous operations in the circuits while such a bounce phenomenon is being produced. In addition, at the same time, since the relay does not function completely as a switching circuit, such an electromagnetic relay can not be used in a device that requires a characteristic

switching at high speed.

  (2) In this case, precious metal on the contact surface may be evaporated or transferred due to the discharge produced by the closing and opening of a contact under the current and voltage conditions by which a discharge of The arc can be produced and the contact surface can be deformed if the contact is opened and closed many times. As a result, a rebound phenomenon is produced by opening and closing the contacts. In addition, an electric shock is continued while the rebound phenomenon is produced. As a result, the cycle of duration or life of

contacts is shortened.

  (3) Essentially, the armature 75 is caused to switch inversely alternately, confronting the poles

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  71, 71, centered around the support spring 78. As a result, the suport spring 78 is subject to

torsional deformation.

  However, once the impact vibrations are produced at the above-mentioned reinforcement 75, deformation due to bending and tension is further given to the support spring 78 in addition to the torsional deformation as shown in FIG. 78. impact vibrations of the armature 75 are produced when the support spring 78 is subject to the maximum torsional deformation, the maximum stress acting in the support spring 78 is made larger compared to a case of the deformation by torsion. As a result, the durability (life) of the support spring 78 is shortened in cases where it is

used repeatedly.

  In addition, since impact vibrations are produced whenever the electrical contacts change, a number of deformations due to sag and voltage are produced for a change of contact operation at a time, so the number of repetition times deformation acting on the support spring 78 is increased and the duration (life) thereof is also shortened. (4) Although a magnetic residual gap is formed by a non-magnetic plated layer or a non-magnetic metal plate between the armature 75 and the magnetic pole 71 to adjust the magnetic attraction force of the armature 75 and magnetic pole 71, such a non-magnetic plated layer or non-magnetic metal plate which constitutes the magnetic residual air gap can be used

  by impact vibrations of the armature 75.

  If the contact surface of the armature 75 with the magnetic pole 71 is observed when impact vibrations are produced at the armature 75, relative movement of remarkably small magnitude in response to the impact vibrations of the armature 75 reinforcement 75 is made between the frame 75 and the magnetic pole 71, resulting in wear by

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  microdeal on the contact between the armature 75 and the magnetic pole 71, so the tiny powder is produced because of wear. Since this minute wear powder adheres or is glued to the surface of the movable contact 77 and the fixed contact 55, resulting in a faulty contact,

  the contact time will be shortened.

  In addition, since the magnetic residual gap formed between the armature 75 and the magnetic pole 71 due to friction is decreased, the operating properties may change due to an increase in the operating voltage and / or a lowering of the operating voltage. the reflected or return voltage, thereby bringing the duration of the electromagnetic relay to

be shortened.

  The respective terminals of the fixed contact terminal 56, the common terminal 58, the coil terminal 60, etc. and the fixed contact 55 are provided in the housing 51 and the respective terminals of the fixed contact terminals 56, the common terminal 58 and the coil terminal 60, etc., which are formed by pressure molding of a conductive thin plate , such as copper alloy etc., to a predetermined shape, are molded by piece incised by a molding material such as synthetic resin, etc., so that one end of

  these protrude from below the housing 51.

  The fixed contact 55 is formed by electrically welding a piece of precious metal in volume to the fixed contact junction portion 57 and the movable contact 77 is formed by electrically welding a piece of precious metal in volume to

  the end portion of the movable contact spring 76.

  However, in particular, since the fixed contact 55 is formed by electrically welding a precious metal tip in volume to the fixed contact junction portion 57, the contact height can be made unequal, resulting from the fact that the terminal shape is complicated and the terminal is molded by inserted piece. If the contact height is made unequal, the contact pressure between the fixed contact 55 and the movable contact 77 differs with each contact, so the contact properties are made unequal and the distance

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  between the fixed contact 55 and the movable contact 77 becomes unequal. As a result, the state of said rebound phenomenon will differ from each contact and it will be very difficult to make adjustments for the capacity of the electromagnetic relays. In addition, there is such a problem that depending on the state of electrical welding of a piece of precious metal in volume, the contact height can change and the contact pressure is

made unequal.

  In addition, if the welding state is not sufficient, the thermal resistance between the fixed contact 55 and the fixed contact junction portion 57 and between the movable contact 77 and the movable contact spring 76 is made larger. in particular, if the electromagnetic relay is used under such a condition that an arc discharge is produced and the wear of the contact will be remarkable, thereby causing such a problem to occur.

  produce o the duration (life) of the contact is reduced.

  Additionally, if an attempt is made to achieve a sufficient soldered state, the temperature of a welding portion is increased by welding thereof, thereby causing the movable contact spring 76 and the fixed contact junction portion 77 to be deformed. and there will occur such a problem that the

  contact height is made unequal.

  It is therefore an object of the invention to provide a high performance, long lasting electromagnetic relay which can prevent a bouncing phenomenon from occurring, to increase the duration (life) in the repeated movement of a spring. medium, minimize microdeal wear on the contact surface between the armature and the magnetic poles, prevent changes in operating characteristics due to changes in a magnetic residual air gap and prevent faulty contact contact due to adhesion of powder due to friction on the contacts, to obtain a stabilized contact pressure with the heights of contacts made equal and

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  perform a long life contacts even under a condition

discharge.

  In order to accomplish the above object, the invention constitutes an electromagnetic relay comprising: an electromagnet block comprising an iron core on which a coil is wound and a permanent magnet; an armature block comprising a frame, a movable contact spring, an insulating support member and a support spring extending from the longitudinal center of the movable contact spring in the direction perpendicular thereto and fixed to a housing, wherein the armature and the movable contact spring are formed in one piece with each other by the insulating support member, which can switch inversely between two magnets, confronting the electromagnet block , centered around the support spring; the housing having a common terminal and a fixed contact terminal and a coil terminal, and to which the electromagnet housing is attached; and an envelope fixed externally to the housing, a stop means is provided, which regulates the upward or downward movement of the support spring, which displacement is produced by tilting of the armature. In addition, the invention constitutes an electromagnetic relay comprising: an electromagnet block comprising an iron core on which a coil is wound and a permanent magnet; an armature block comprising a frame, a movable contact spring, an insulating support member and a support spring extending from the center of the movable contact spring in the direction perpendicular thereto and attached to a housing; the housing being provided with a common terminal, a fixed contact terminal and a coil terminal, to which the electromagnet block and the reinforcing block are fixed, unidirectional connection means is provided which causes the armature and the moving spring contact to reverse, confronting the magnetic poles of the electromagnet block and centering around the spring of the carrier in such a state that

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  the armature and the movable contact spring are formed to be separated by means of an insulating support member. In addition, the invention constitutes an electromagnetic relay which is provided with a unidirectional connecting means, o a contact pressure stabilization mechanism is provided, which consists of a condensing element magnetic flux or a commitment piece to optimize the contact pressure between the moving contact and

the fixed contact.

  In addition, the invention constitutes an electromagnetic relay provided with a displacement stop means which regulates the upward or downward movement of the support spring due to the displacement of the armature resulting from a force of attraction. magnetic element of the aforementioned

magnetic flux condensation.

  In addition, the invention constitutes an electromagnetic relay in which a plastic sheet is made to intervene between the armature and the poles.

magnetic.

  Additionally, the electromagnetic relay is constituted by providing the housing of an insulating substrate made of ceramic or glass-coated metal, a fixed contact made of a thick sinter-molding film formed on the upper surface of the insulating substrate, a armature block, and an attachment portion to which the electromagnet block is attached, and providing the insulating substrate of a coil terminal, a common terminal and a

  fixed contact terminal below it.

  Still further, the invention constitutes an electromagnetic relay in which the movable contact formed at both ends of the mobile contact spring is made of

  a thick film-sintering-molding paste.

  As described above, an electromagnetic relay provided with a one-piece movable contact spring with a frame and an insulating support member causes an attraction force to act roughly on the end portion.

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  of the armature at the side thereof which is not in contact with a magnetic pole by magnetizing the coil so that the attraction force of the permanent magnet acting on the magnetic pole of the electromagnet at side of it which is in contact with the armature is weak and the attraction force of the permanent magnet acting on the magnetic pole on the other side is reinforced, so the armature is caused to switch from the opposite way, to center around the support spring, when electric current flows, causing the contact to reverse. At this time, a collision occurs between the armature and the magnetic pole and impact vibrations are produced, resulting from the fact that the tilting energy of the armature is not completely absorbed.

  The impact vibrations are transmitted to the movable contact spring and the support spring, whereby a displacement is produced in the vertical direction to the support spring in addition to the torsional deformation. However, since the displacement of the support spring in the vertical direction due to the impact vibrations is regulated by a stop means, the amount of displacement of the support spring in the vertical direction is decreased and the deflection of the movable contact spring is made constant, so the production time of the impact vibration can be

shortened.

  In addition, in such a construction where the armature and the movable contact spring are divided and separated from each other via the insulating support member, since the armature is constructed to switch from Conversely, armor impact vibrations are not transmitted to the movable contact spring and the support spring even though the impact vibrations are produced by the collision between the armature and the magnetic pole. As a result, the support spring is not displaced in the vertical direction and the deflection of the

  movable contact spring is made constant.

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  Moreover, since a plastic sheet is made to intervene between the armature and the magnetic pole, the impact vibrations due to the collision between the armature and the magnetic pole are absorbed by the plastic sheet, the time of impact vibration of the armature is shortened and at the same time no powder due to microdeal wear between the armature and the pole

magnetic is not produced.

  In addition, since the movable contact is formed of a sintering body of thick film paste and the housing is composed of an insulating substrate made of ceramic or glass-coated metal and a fixed contact made in a body of sintering-molding of thick film paste, which is formed at the top of the insulating substrate, the height of the contacts is made uniform and carried out without any inequality, and in particular, in a case of an electromagnetic relay in which a number of contacts are formed, the contact pressure between the fixed contacts and the respective moving contacts is made constant, so the distance between the fixed contacts and the contacts

mobile is made constant.

  In view of the defects and problems described above, the

  The present invention can eliminate these defects and problems.

  From the description above, in a relay

  electromagnetic unit comprising an electromagnet block, an armature block, a housing having the armature block and the armature, and an envelope fixed externally to the housing, since a stop means which regulates a displacement towards the up or down the support spring, which displacement is produced along the tilting of the armature, is adopted, an electromagnetic force is produced at the magnetic poles by exciting the coil of the electromagnet block and the armature is attracted by said electromagnetic force. As a result, it is possible to attenuate the impact vibrations of the armature by regulating the upward or downward movement of the support spring, which is produced by impact vibrations occurring between the armature. and the

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  magnetic poles when the armature is tipped in reverse, the rebound is prevented from occurring and the

  duration (life) of the support spring can be increased.

  In addition, the contacts are reversed at a high speed since it is possible to prevent the bouncing from occurring. As a result, an electromagnetic relay according to the invention is applied to devices in which high speed switching is required. Moreover, since the bouncing can be prevented from occurring, it is possible to increase the duration (life) of the contacts even under the conditions of

  production of electric shocks.

  In an electromagnetic relay comprising an electromagnet block, an armature block, a casing having the electromagnet block and the armature, and an envelope fixed externally to the casing, bringing the movable contact spring and the armature to be reverse-tilted between two magnetic poles centered around the support spring via a unidirectional connecting means which allows the displacement to be transmitted in one direction along the movements of the armature, the impact vibration in the direction along which the armature is further dissociated from its stabilized state, from impact vibrations produced by collision between the armature and the magnetic pole, is not transmitted to the movable contact spring and the support spring. As a result, it is possible to reduce the bouncing occurring and it is possible

  to increase the life (life) of the support spring.

  By using a contact pressure stabilization mechanism in addition to the unidirectional connecting means, the engagement of the unidirectional connecting means when the movable contact is brought into contact with the fixed contact is reinforced, a predetermined deflection can be obtained and a pressure much higher contact can be obtained. As a result, it is possible to further stabilize

the contact resistance.

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  Since, in addition to the unidirectional connecting means, a contact pressure stabilization mechanism comprising a magnetic flux condensing element is provided and further a displacement stop means, which regulates upward or downward movement. of the support spring along the upward or downward movement of the armature by a magnetic attraction force produced by the magnetic flux condensing element, is provided in such a state that it is in contact with with or slightly apart from the upper or lower portion of the support spring, the life (life) of the support spring can be much increased. At the same time, a more stabilized contact pressure can be obtained and it is possible

  to prevent the bouncing of contacts from occurring.

  It is possible to absorb impact vibrations produced by causing the armature to tilt in an inverse manner, by causing a non-magnetic sheet such as a plastic sheet element, etc. to intervene between the armature and the magnetic poles, and it is possible to minimize the impact sound due to the impact vibrations of the armature. As a result, it is possible to shorten the production time of

impact vibrations.

  In addition, the effect of preventing bouncing from occurring is greatly increased and it is possible to further increase the life (life) of the support spring and at the same time it is possible to prevent powder due to micro-wear to be produced. Because of this, it is possible

  to extend the service life of the contacts.

  In addition, it is easier to adjust the magnetic residual gap by forming the magnetic residual air gap

  with a plastic sheet and the inequality is minimized.

  Since the housing is provided with an insulating substrate made of ceramic or glass-covered metal, a fixed sinter-molding contact with a thick film paste, which is formed on the upper part of the insulating substrate and a portion of fixation to which the reinforcement block and the electromagnetic block are provided, and furthermore equipped with

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  a coil terminal, a common terminal and a fixed contact terminal to the lower part of the insulating substrate, it is much easier to adjust the height of the fixed contacts, the series production efficiency thereof is greatly increased with the inequality of these minimized and

  it's easy to change a group of terminals.

  In addition, since the thermo-electromotive force thereof is reduced, an electromagnetic relay according to the invention can be used for small signal circuits and since the heat dissipation is greater, it is possible to extend the duration (life ) contacts even if a usage occurs in such a state where an arc discharge occurs. In particular, in the electromagnetic relay having a number of contacts, the contact pressure among the respective contacts is stabilized and the operating period is synchronized, so the reliability of the

  electromagnetic relay is further increased.

  Still further, it is easy to form a microstrip line and a coplanar line using a ceramic substrate and if the fixed contact conduction portion and the common terminal conduction portion, which are signal lines, are formed. with a microstrip line or a coplanar line, it is possible to obtain an electromagnetic relay of higher high frequency characteristics. Since an electromagnetic relay is constituted by through holes formed in the insulating substrate and by fixing contact connections through these through holes between components provided on the upper surface and the lower surface of the insulating substrate, electrical connections between the upper and lower surfaces are provided. bottom of the insulating substrate are made easier, thereby bringing the

  mass production output to be much improved.

  Since an electromagnetic relay is formed by forming a movable contact by sintering-molding a thick film paste at both ends of the movable contact spring,

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  the thermal resistance between the moving contact and the mobile contact spring is minimized, so that the duration (life) of the contacts can be lengthened even if they are used under the condition of producing a discharge of bow. The invention will be better understood and other purposes, features, details and advantages thereof

  will appear more clearly in the explanatory description

  which will follow with reference to the accompanying schematic drawings given solely by way of example illustrating several embodiments of the invention and in which: - Figure 1 is a plan view of a first embodiment of the invention ; Figure 2 is a sectional view taken along the line II-II of Figure 1; FIG. 3 is a sectional view taken along the line III-III of FIG. 1; FIG. 4 is a sectional view of a second preferred embodiment of the invention; FIG. 5 is a sectional view of a third preferred embodiment of the invention; FIG. 6 is a plan view of a fifth preferred embodiment of the invention; Figure 7 is a sectional view taken along the line VII-VII of Figure 6; Fig. 8 is a sectional view taken along the line VIII-VIII of Fig. 6; FIG. 9 is a plan view of an armature block according to the fifth preferred embodiment of the invention; FIG. 10 is a front elevational view of the reinforcing block according to the fifth preferred embodiment of the invention; Fig. 11 is a sectional view taken along line XI-XI of Fig. 9;

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  FIG. 12 is a bottom view of the reinforcing block according to the fifth embodiment of the invention; FIG. 13 is a view for explaining the actions of the armature according to the fifth preferred embodiment of the invention; Fig. 14 is a view showing the operating state of contacts of a conventional example and the operating state of contacts of the fifth preferred embodiment of the invention; FIG. 15 is a plan view of a sixth preferred embodiment of the invention; Fig. 16 is a sectional view taken along line XVI-XVI of Fig. 15; Fig. 17 is a sectional view taken along the line XVII-XVII of Fig. 15; Fig. 18 is a plan view of an armature block according to the sixth preferred embodiment of the invention; Fig. 19 is a front elevational view of the reinforcing block according to the sixth preferred embodiment of the invention; Fig. 20 is a sectional view taken along line XX-XX of Fig. 18; - Figure 21 is a bottom view of the armature according to the sixth preferred embodiment of the invention; Fig. 22 is a view for explaining the armature according to the sixth preferred embodiment of the invention; Fig. 23 is a view showing the engaged state of unidirectional link means in a case where the contact pressure of the fifth preferred embodiment of the invention is increased; Fig. 24 is a view showing the engaged state of a unidirectional link means in a case where the contact pressure of the sixth preferred embodiment of the invention is increased; FIG. 25 is a plan view of a seventh preferred embodiment of the invention;

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  FIG. 26 is a sectional view taken along line XXVI-XXVI of FIG. 25; - Figure 27 is a sectional view taken along the line XXVII-XXVII of Figure 25; - Figure 28 is a sectional view of main parts showing a first contact pressure stabilization mechanism according to the invention; Fig. 29 is a view for explaining the actions of an armature in which the first contact pressure stabilization mechanism of the invention is adopted; FIG. 30 is a sectional view of main parts showing a second contact pressure stabilization mechanism of the invention; Fig. 31 is a sectional view of main parts showing a third contact pressure stabilization mechanism of the invention; Fig. 32 is a view for explaining the actions of an armature in which the third contact pressure stabilization mechanism of the invention is adopted; Fig. 33 is a sectional view of main parts showing a fourth contact pressure stabilization mechanism of the invention; Fig. 34 is a plan view of an eleventh preferred embodiment of the invention; Fig. 35 is a sectional view taken along the line XXXV-XXXV of Fig. 34; Fig. 36 is a sectional view taken along line XXXVI-XXXVI of Fig. 34; Fig. 37 is a sectional view of main parts showing a fifth contact pressure stabilization mechanism of the invention; Fig. 38 is a sectional view of main parts showing a sixth contact pressure stabilization mechanism of the invention;

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  Fig. 39 is a sectional view of main parts showing a seventh contact pressure stabilization mechanism of the invention; Fig. 40 is a sectional view of main parts showing an eighth contact pressure stabilization mechanism of the invention; FIG. 41 is a plan view of a fifteenth preferred embodiment of the invention; FIG. 42 is a sectional view along the line XLII-XLII of FIG. 41; FIG. 43 is a sectional view along the line XLIII-XLIII of FIG. 42; Fig. 44 is a plan view showing a sixteenth preferred embodiment of the invention; FIG. 45 is a sectional view taken along line XLV-XLV of FIG. 44; Fig. 46 is a sectional view taken along the line XLVI-XLVI of Fig. 44;

  FIG. 47 is a plan view showing a nineteenth

  seventh preferred embodiment of the invention; Figure 48 is a front elevational view of the seventeenth preferred embodiment of the invention; Fig. 49 is a sectional view taken along line XLIX-XLIX of Fig. 47; Fig. 50 is a plan view showing a housing according to the seventeenth preferred embodiment of the invention; Fig. 51 is a front elevational view showing the housing according to the seventeenth preferred embodiment of the invention; Fig. 52 is a side elevational view showing the housing according to the seventeenth preferred embodiment of the invention; Fig. 53 is a plan view of an armature block according to the seventeenth preferred embodiment of the invention;

23 2736201

  FIG. 54 is a front elevational view of the reinforcing block according to the seventeenth preferred embodiment of the invention; Fig. 55 is a plan view of an armature block provided with a block frame according to the seventeenth preferred embodiment of the invention; Fig. 56 is a sectional view taken along line LVI-LVI of Fig. 55; Fig. 57 is a plan view of a nineteenth preferred embodiment of the invention; - Figure 58 is a sectional view taken along the line LVIII-LVIII of Figure 57; Fig. 59 is a sectional view taken along line LXI-LIX of Fig. 57; Fig. 60 is a plan view showing a twentieth preferred embodiment of the invention; Fig. 61 is a sectional view taken along line LXI-LXI of Fig. 60; FIG. 62 is a sectional view taken along line LXII-LXII of FIG. 60; Fig. 63 is a plan view of a twenty-first preferred embodiment of the invention; - Figure 64 is a sectional view taken along the line LXIV-LXIV of Figure 63; Fig. 65 is a sectional view taken along line LXV-LXV of Fig. 63; Fig. 66 is a plan view of a twenty-second preferred embodiment of the invention; - Figure 67 is a sectional view taken along line LXVII-LXVII of Figure 66; Fig. 68 is a sectional view taken along line LXVIII-LXVIII of Fig. 66; Fig. 69 is a disassembled perspective view of a conventional example; Fig. 70 is a plan view of the conventional example;

24 2736201

  - Figure 71 is a sectional view taken along line LXXI-LXXI of Figure 70; Fig. 72 is a sectional view taken along line LXXII-LXXII of Fig. 70; FIG. 73 is a plan view of an armature block according to the conventional example; FIG. 74 is a front elevational view of the reinforcing block according to the conventional example; Fig. 75 is a sectional view taken along line LXXV-LXXV of Fig. 73; Fig. 76 is a bottom view of the frame block of the conventional example; Fig. 77 is a view for explaining the actions of the frame block of the conventional example; and - Figure 78 is a view for explaining the actions

  a support spring of the conventional example.

  Hereinafter, preferred embodiments of the invention are described in detail with reference to the accompanying drawings. In these preferred embodiments, the elements which are identical to those of the conventional example bear the same reference numbers and the explanation of these same

elements is omitted below.

  A first preferred embodiment of the invention is described using FIGS. 1 to 3 with reference to FIGS.

  Figures 70, 71 and 72 which describe the conventional example.

  51 is a housing that has a side wall 52 and is

  box-like, the upper surface of which is open.

  The housing 51 is divided into a reel receiving chamber 53 and a reinforcement receiving chamber 54 by a partition wall 51a and is provided with stop means 24a,

24b described later.

  A fixed contact terminal 56, a common terminal 58, a coil terminal 60, etc., which are formed into a predetermined shape by pressure molding of a thin conductive plate of copper alloy are disposed in the housing 51 so that one end of each of the respective terminals protrudes downward from the bottom

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  of the housing 51, where a group of these terminals is fixed by an insert-molded synthetic resin, etc. One end of the fixed contact terminal 56 protrudes from below the housing 51 and the other end thereof is disposed at each of the four corners of the armature receiving chamber 54 and the fixed contact 55 made of a piece of precious metal volume is attached to the upper part of the fixed contact terminal 56 by electric welding for

  ensure an electrical connection between them.

  One end of the common terminal 58 protrudes from below the housing 51 and the other end thereof is disposed at the longitudinal center of the side wall of the armature receiving chamber 54 and at the center of the wall. separation 51a, thereby causing a common terminal joint portion 59 to be formed. A support spring 78 of the reinforcing block 73 described later is attached to the common terminal junction portion 59 by electrical welding. The stop means 24a, 24a which regulate the upward movement of the support spring are made of insulating material such as synthetic resin, etc., and are provided to protrude from the longitudinal center of the side wall of the chamber. receiving armature 54 and the center of the partition wall 51a, so that they are brought into contact with the lower part of the spring of

  support 78 or slightly apart from this lower part.

  In addition, the stop means 24b, 24b which regulate the downward movement of the support spring are made of insulating material such as synthetic resin, etc., and are intended to protrude from the longitudinal center of the lateral wall of the support spring. the armature receiving chamber 54 and the center of the partition wall 51a, so that they are brought into contact with the upper part of the support spring 78 or slightly apart from this upper part

(Figure 3).

  As already explained, the coil terminal 60 is provided so that one end thereof projects from

26 2736201

  below the housing 51 and the other end thereof protrudes from the concave portion of the side wall of the coil receiving chamber 53, thereby causing the coil terminal junction portion 61 to be formed. The coil output terminal 68 of the electromagnet block 62 described later is attached to the connecting portion of

  coil terminal 61 by electric welding.

  The electromagnet block 62 is composed of an electromagnet

  magnet 63 and a permanent magnet 72. The electromagnet 63 is furthermore composed of an iron core 64, a coil 69 and

a coil output terminal 68.

  The iron core 64 is made of an electromagnetic soft iron magnetic substance and is formed to be roughly channel-shaped and at the intermediate portion thereof a coil body 66 made of a synthetic resin molded element, etc., is provided, and the end portion of the coil body 66 is provided with a flange 67 made of a synthetic resin molded element, etc., where the two ends of the iron core 64 protrude laterally from the flange 67 and the magnetic poles 71 are

trained in it.

  The coil output terminal 68 (Fig. 2) is made of a conductive metal material and is formed to be roughly channel-shaped. The coil output terminal 68 is provided to protrude from the flange 67, where one end thereof is attached to the coil terminal junction portion 61 of the housing 51 by electrical welding to

  ensure electrical connection with coil terminal 60.

  The coil 69 is wound on the coil body or support 66 attached to the intermediate portion of the iron core 64 and the coil exit line 70 is welded and secured to the other end of the coil output terminal 68, so the coil output line 70 is electrically connected to the coil terminal 60 via

the coil output terminal 68.

  The permanent magnet 72 is roughly plate-shaped, both ends of which are magnetized at

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  same pole and the middle part thereof is magnetized to the other pole, where the two ends thereof are provided to intervene between the magnetic poles 71, 71 which are

  the ends of the iron core 64.

  The reinforcing block 73 is composed of a frame 75, a movable contact 77, a movable contact spring 76, a support spring 78 and an insulating support member 79. 75 is made of magnetic material such as electromagnetic soft iron, etc. and is formed to

  be roughly plate shaped.

  The movable contact spring 76 is formed of copper alloy conductive metal material, etc. The movable contact spring 76 is mounted in one piece with the frame 75 at the bottom thereof by an insulating support member 79 made of an insulating material such as synthetic resin, etc., which is provided in parallel with the armature 75. The movable contact 77 made of precious metal end volume is attached to both ends of the movable contact spring 76 by electrical welding and is electrically connected to the common terminal 58 via a

  support spring 78 described later.

  The support spring 78 is mechanically and electrically formed in one piece with the movable contact spring 76, extends from the longitudinal center of the spring of

  movable contact 76 in the direction perpendicular to that

  and is electrically bonded to the common terminal joint portion 59 disposed at the longitudinal center of the armature receiving chamber 54 of the housing 51 and at the center of the partition wall 51a, thereby connecting

  electrical with the common terminal 58 is performed.

  In addition, an envelope 82 (not shown) is fixed externally to the housing 51 in which the reinforcement block

  73 and the electromagnet block 62 are provided.

  In an electromagnetic relay thus constructed according to the first preferred embodiment of the invention, if the coil 69 of the electromagnet block 62 is energized, a force

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  electromagnetic is produced at the magnetic pole 71 to cause an attractive force to act on the armature 75, so the armature 75 is caused to tilt in an inverse manner, confronting the magnetic poles 71, 71 of the iron core centering around the support spring 78. At this time, although impact vibrations are produced to the armature 75 in a transitional phenomenon by collision of the armature 75 with the magnetic pole 71 to cause the support spring 78 to be moved in the vertical direction, the downward movement of the support spring 78 is regulated by the stop means 24a being brought into contact with the support spring 78, so that it is possible to obtain a stabilized contact pressure and it is possible to prevent a bouncing from occurring. In addition, since deformations other than torsion strength of support 78 are reduced, the life (life) of the support spring 78 can be greatly increased. Still further, the upward movement of the support spring 78 is regulated by the stop means 24b brought into contact with the support spring 78, so that a stabilized contact pressure can be obtained and it is possible to prevent a rebound from occurring. As a result, since deformations other than torsion of the support spring 78 are reduced, the duration (life) of the

  Support spring 78 can be increased greatly.

  Since no bouncing phenomenon is produced, the duration cycle of the contacts can be lengthened even under the conditions of current and voltage o an arc discharge

occurs.

  In addition, the energy of the impact vibrations is absorbed by the stop means 24a, 24b, so that the duration of the

  production of impact vibration can be shortened.

  Here, although such a construction is adopted o the stop means 24a, 24b are respectively provided to protrude from the longitudinal center of the side wall of the armature receiving chamber 54 and the central portion of the wall separation 51a, only one of two

29 2736201

  can be provided instead. In addition, it is possible to obtain the same effect if they are provided at the lower part and at the upper part of the insulating support element 79, the housing 51 and the permanent magnet 72 located at the bottom. or the upper part of the insulating support member 79, the lower part and the upper part of the support element 78 and the casing 82, etc. FIG. 4 represents a second preferred embodiment of the invention, in which the stop means 24c, 24d are provided on the bottom surface of the housing 51 and below the permanent magnet 72 while the

insulating support 79 is placed between them.

  In the second preferred embodiment of the invention, since the displacement of the reinforcing block 73 in the vertical direction is reduced by the stop means 24c, 24d, a movement of the support spring 78 in the

  vertical direction is therefore regulated.

  FIG. 5 represents a third preferred embodiment of the invention, the stop means 24e, 24f are provided below and at the upper surface of the insulating support element 79, which has the same effect as that of the first

  or the second preferred embodiment.

  In addition, it will be said that these stop means 24e, 24f are constructed in one piece with the element of

insulating support 79.

  A fourth preferred embodiment is characterized in that a plastic sheet is made to intervene between the armature and the magnetic pole (no

illustrated).

  A plastic sheet, for example polyethylene terephthalate, polyethylene naphthalate, polyimide, polyetherimide, polyphenylenesulphide, aramid, liquid polymer, etc ..., is caused to intervene between the frame 75 and the magnetic pole 71, thereby causing a gap

  magnetic residual to be formed.

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  In the preferred embodiment, although a 25 μm thick polyimide film is used, the magnetic residual gap can be formed by combining with a conventional non-magnetic plated layer and a non-magnetic metal plate. In an electromagnetic relay thus constructed, since an impact due to a collision between the armature 75 and the magnetic pole 71, which occurs when the armature 75 is brought to reverse, is absorbed by a plastic sheet which is an elastic substance, it is possible to shorten the production time of the impact vibrations. In comparison with the first preferred embodiment, the effect of preventing a bouncing phenomenon can be increased and a displacement other than a twist of the support spring 78 is further reduced. As a result, a displacement other than the torsion of the support spring 78 can be reduced to bring the life of the spring of

  support 78 to be increased by a lot.

  In addition, in addition to the impact vibrations between the armature 75 and magnetic pole 71 that are absorbed, since there is no powder produced due to microdeal wear between the armature 75 and the magnetic pole. 71, it is possible to prevent a faulty contact of the contact points, which can be produced by powder due

to friction.

  In addition, since the magnetic residual air gap is not changed due to microdeal wear, it is possible to prevent the operating characteristics from fluctuating due to an increase in the voltage of the magnet.

  operation and lowering of the return voltage.

  In addition, it will be easy to adjust the magnetic residual gap by forming the magnetic residual gap with a plastic sheet and the inequality thereof can be

reduced by a lot.

  Here, since the above-mentioned plastic sheet and reinforcement are subjected to impacts and relative microdisplacements are produced on the surface of

31 2736201

  contact between the plastic sheet and the frame, a high crystalline polymer is highly recommended as a material

of the plastic sheet.

  In addition, since the operation of an electromagnetic relay is accompanied by heating of the coil, it is also highly recommended that the plastic sheet has a heat resistance property of C or higher. Polyimide is more preferable as

  material capable of satisfying these conditions.

  Next, Figures 6 to 8 show a fifth preferred embodiment of the invention. A movable contact spring 76, a support spring 78, an armature 19, a magnetic pole 71 and a permanent magnet 72 are laminated in the order of the bottom of the housing 51, a unidirectional connecting means 32a is composed of a engagement portion attached to the insulating support member 21a and a portion to be engaged, which is attached to the frame 19, and the movable contact spring 76 and the frame 19 are separated from one of the other and are composed so that they are able to function independently through the element

insulating support 21a.

  Figures 9 to 12 show an armature block 18a of the fifth preferred embodiment of the invention, the insulating support member 21a made of insulating material such as synthetic resin, etc., whose cut is roughly channel shape, is molded by insert to the center of the movable contact spring 76 together with the movable contact spring 76. An engagement piece 33 is formed on the upper surface of the side walls 21c, 21d which are free ends of the element of

insulating support 21a.

  The support spring 78 which is electrically and mechanically in one piece with the moving contact point 76 is formed to extend from the longitudinal center of the movable contact spring 76 in the direction perpendicular thereto, while the spring support 78 is fixed by electrical welding to the connecting portion of

32 2736201

  common terminal 59 which is disposed at the longitudinal center of the armature receiving chamber 54 of the housing 51 and at the

  center of the partition wall 51a.

  The armature 19 made of a soft magnetic material such as electromagnetic soft iron, etc., which is formed to be roughly plate-shaped, is disposed at the top of the movable contact spring 76 and the armature 19 is provided with a opening 37 in which the side walls 21c, 21d formed on the insulating support member 21a are inserted. The side walls 21c, 21d of the insulating support member 21a and the engagement piece 33 are inserted into the opening 37 and engaged therewith, thus the movable contact spring 76 and the frame 19 are separated. Such a construction is here called the means of

unidirectional link 32a.

  The magnetic pole 71 of the electromagnetic magnet block 62 and the permanent magnet 72 are arranged

at the top of the frame 19.

  The unidirectional connecting means 32a is formed by the side walls 21c, 21d formed at the insulating support member 21a, the channel-shaped cut as described above, passing through the opening 37 formed in the armature 19 and the engagement piece 33 which is the engagement portion attached to the end portion of the side walls 21c, 21d being engaged with the opening 37 which is the portion to engage the frame 19, the so an end portion of the armature 19 is attracted to the magnetic pole 71 and retained thereby by a force of attraction of the permanent magnet 72 in such a state that the engagement piece 33 is engaged with the opening 37 of the

portion to engage.

  In an electromagnetic relay of the fifth preferred embodiment thus constructed of the invention, an electromagnetic force is produced by exciting the coil 69 of the electromagnet block 62, an attraction force is caused to act on the portion of the electromagnet 62. end of the armature 19 to the side which is apart from the magnetic pole 71, so the room

33 2736201

  33 of the insulating support member 21a engaged with the opening 37 of the portion to engage the armature 19 at its side which is apart from the magnetic pole 71 is raised or rectified and the insulating support member 21a and the movable contact spring 76 which is in one piece with the insulating support member 21a is caused to reverse switch between the magnetic poles 71, 71, centering

  around the support spring 78 attached to the housing 51.

  Since the engagement piece 33 of the engagement portion which constitutes the unidirectional connecting means 32a is engaged with the opening 37 of the portion to be engaged and the frame 19 is retained by a force of attraction of the magnet 72, the armature 19 is caused to switch inversely between the magnetic poles 71, 71, centered around the support spring 78 together with

the movable contact spring 76.

  The actions of the armature 19 in the fifth preferred embodiment are described, using FIG. 13, with reference to the actions (FIG. 77) of the armature

Conventional 75.

  (a) represents a state where the armature 19a is magnetically attracted by a magnetic pole 71a of the electromagnet block 62 and the movable contact 77a is in contact with the fixed contact 55a (not illustrated) in a state

stabilized.

  Here, if the coil 69 of the electromagnet block 62 is excited in such a direction that the magnetic attraction force between the armature 19a and the magnetic pole 71a is reduced and the magnetic attraction force between the armature 19b and the magnetic pole 71b is increased, the armature 19b is magnetically attracted to the other magnetic pole 7bb at the moment when the magnetic attraction force between the armature 19b and the magnetic pole 7bb exceeds the magnetic attraction force between the armature 19a and the magnetic pole 71a, so the armature 19 is brought to

  switch inversely (see Figure 13b).

34 2736201

  (b) represents the moment when the armature 19 is caused to reverse by excitation of the coil 69 of the electromagnet block 62 and the armature 19b is brought into collision with the other magnetic pole 71b. At this time, since the kinetic energy by which the armature 19 is brought in the opposite way is not absorbed between the armature 19b and the magnetic pole 75b, impact vibrations are produced at the armature 19. production states of

  Impact vibrations are represented in (c) and (d) below.

below.

  (c) represents a state where the armature 19a is more dissociated from the magnetic pole 71a by the impact vibrations

  between the frame 19b and the magnetic pole 7lb.

  On the other hand, an opening 37 in which side walls 21c, 21d formed on the insulating support member 21a are inserted is formed on the frame 19 and the side walls 21c, 21d of the insulating support member 21a pass through. the opening 37. The engagement piece 33 which is an engagement portion formed on the upper surface of the side walls 21c, 21d of the insulating support member 21a is engaged with the engaging portion of the frame 19 to returning the armature 19 to be retained by the attractive force of the permanent magnet 72, so a unidirectional connecting means 32a is formed. Therefore, unless the engaging portion of the frame 19 raises the engagement piece 33 of the insulating support member 21a, the action of the frame 19 is not transmitted to the

movable contact spring 76.

  Therefore, in this state, since the impact vibrations of the armature 19 are not transmitted to the movable contact spring 76, etc., the support spring 78 is not moved downward, differing from 75 (see Figure 77 (c)) of the example and it is possible to the movable contact 77a to be brought into contact with the fixed contact 55a (no

  shown) in a steady state.

  (d) is the state following state (c) and represents a

  state o the frame 19a comes close to the magnetic pole 71a.

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  In this state, although the armature 19a (see Fig. 13 (c)) which has been further dissociated from the magnetic light 71a by the impact vibrations is caused to come close to the magnetic light 71a by the reaction thereof to the maximum, the kinetic energy is low because the reaction is the moment of inertia of only the armature 19. As a result, the spring

  support 78 is barely moved up.

  Thus, since the support spring 78 is not moved downward and is barely upwardly displaced, it is possible to reduce the displacement other than twisting of the support spring 78 and to reduce the bouncing. In addition, it is possible to increase the duration (life) of the spring

support 78.

  Moreover, it is possible to obtain the same effect if the engagement portion formed at the insulating support member 21a and the portion to be engaged, which is formed at

  the armature 79, are provided in a reverse manner.

  In addition, as described in the fourth preferred embodiment of the invention, since it is possible to absorb impact vibrations of the frame 19 by causing a plastic sheet to intervene between the armature and the pole magnetic, a rebound can be reduced, so the life (life) of the support spring 78

can be increased.

  Fig. 14 is a view showing the situation of contact operation where the state of production of this bouncing phenomenon is observed. In the same drawing, (1) and (5) show that an electric current flows to the coil 69, (2) and (6) show states where the movable contact 77b is in contact with the fixed contact 55b, (3) ) and (7) show states where the two movable contacts 77a, 77b are not in contact with the fixed contacts 55a, 55b and (4) and (8) show states where the movable contact 77a is in

contact with the fixed contact 55a.

  In addition, (3) and (7) also show a non-contact state while changing the contacts and the state of

  production of a rebound phenomenon.

36 2736201

  As has been made clear from these drawings, in the fifth preferred embodiment of the invention, since the duration of production of the rebound is very short, a rapid and stabilized inversion of the contacts can be accomplished. FIGS. 15 to 17 show a sixth preferred embodiment of the invention, where a movable contact spring 76, a support spring 78, a magnetic pole 71, a permanent magnet 17 and a frame 20 are laminated in the order from the bottom of the housing 51 and by an engagement portion provided at the end portion of the insulating support member 21b and the engaged portion, which is notched or notched to the frame 20, the side portions 21e, 21f of the insulating support member 21b pass through openings 37b, 37b of the permanent magnet 17 to form a unidirectional connecting means 32b, whereby the movable contact spring 76 is separated from the frame 20 to

  get them to work independently.

  Figures 18 to 21 show an armature block 18b of the sixth preferred embodiment of the invention, wherein an insulating support member 21b made of insulating material such as synthetic resin, etc., whose cut is roughly made. in the form of a channel, is integrally molded together with the movable contact spring 76 in the center of the movable contact spring 76, a projecting portion 36 in the form of a circular column is formed on the upper surface of the side walls 21e, 21f which are free ends of the insulating support member 21b, of which

  the cut is roughly channel-shaped.

  In addition, the support spring 78 which is mechanically and electrically in one piece with the movable contact spring 76 is formed to extend from the longitudinal center of the movable contact spring 76 in the direction orthogonal to it and is electrically bonded to the common terminal joint portion 59 disposed at the longitudinal center of the receiving chamber

37 2736201

  armature 54 of the housing 51 and in the center of the wall of

separation 51a.

  The magnetic pole 71 and the permanent magnet 17 of the electromagnetic block 15 are arranged at the top of the movable contact spring 76 and an opening 37b in which a projecting portion 36 formed on the upper surface of the side walls 21e, 21f of the element 21b-shaped insulating support is inserted, is formed to the magnet

permanent 17.

  An armature 20 made of soft magnetic material such as electromagnetic soft iron is formed to be roughly plate-shaped is disposed at the top of the magnetic paddle 71 and the permanent magnet 17 and a concave portion 35 engageable with the pad portion. protruding 36 formed on the upper surface of the side walls 21e, 21f of the insulating support member 21b is formed below

of the frame 20.

  The unidirectional connecting means 32b is composed of the projecting portion 36 of the engagement portion formed on the upper surface of the side walls 21e, 21f of the insulating support member 21b and the concave portion 35.

  of the portion to be engaged, which is formed on the frame 20.

  The armature 20 is retained by a force of attraction of the permanent magnet 17 with the projecting portion 36 engaged

with the concave portion 35.

  In an electromagnetic relay of the sixth preferred embodiment of the invention thus constructed, an electromagnetic force is generated at the magnetic pole 71 by exciting the coil 69 of the electromagnet block 15 and an attractive force acts on the portion of the magnet. end of the armature 20 to the side thereof which is apart from the magnetic pole 71, so the concave portion 35 of the portion to engage, which is formed to the armature 20 at the side thereof which is apart from the magnetic light 71, presses the projecting portion 36 of the engagement portion of the insulating support member 21b which is engaged with the concave portion and the insulating support member 21b and the spring of

38 2736201

  movable contact 76 which is formed in one piece with the insulating support member 21b are caused to swing in a reverse manner with respect to the magnetic pole 71, 71, centered around the support spring 78 which is fixed to the housing 51. projecting portion 36 and the concave portion 35 of the portion to be engaged, which constitute the unidirectional connecting means 32b, are engaged with each other and retained by the attraction force of the permanent magnet 17 As a result, they are inversely tilted, as described above, with respect to the magnetic pole 71, 71 centered around the support spring 78 together with the armature 20 and the movable contact spring 76. Here, the actions of the armature 20 in the sixth preferred embodiment of the invention are explained, using FIG. 22, with reference to the actions (FIG. 77).

conventional armature 75.

  (a) represents a state where the armature 20a is magnetically attracted to a magnetic pole 71a of the electromagnet block 15 and the movable contact 77a is in contact with the fixed contact 55a (not shown) in a stabilized state. Here, if the coil 69 of the electromagnet block 15 is excited in such a direction that the magnetic attraction force between the armature 20a and the magnetic pole 71a is reduced and the magnetic attraction force between the armature b and the magnetic pole 71b is increased, the armature 20b is magnetically attracted to the other magnetic light 7lb at the moment when the magnetic attraction force between the armature 20a and the magnetic pole 7bb exceeds that between the armature 20b and the magnetic pole 71b, so

  the armature 20 is reversed (see Figure (22b)).

  (b) represents the state of the moment when the armature 20b is brought into collision with the other magnetic pole 71b by inverting the armature 20 due to excitation of the coil 69 of the electromagnet block 15. moment, since the energy

39 2736201

  kinetics which reversed the armature 20 can not be completely absorbed between the armature 20b and the magnetic pole 7lb, impact vibrations are brought to the armature 20. (c) and (d) below show the states o These impact vibrations are produced. (c) represents a state where the armature 20a is more dissociated from the magnetic pole 71a by the impact vibrations

  between the armature 20b and the magnetic pole 7lb.

  Furthermore, a unidirectional connecting means 32b is constituted by retaining the armature 20 by the attraction force of the permanent magnet 17 in such a state that the projecting portion 36 of the engagement portion formed to the element 2b of insulating support is engaged with the concave portion 35 of the portion to be engaged, which is formed to the armature 20, so that the operation of the armature 20 is not transmitted to the movable contact spring 76 unless the concave portion 35 of the portion to be engaged of the armature 20 presses the engagement portion 36 of the element

insulating support 2lb.

  Therefore, in this state, since the impact vibrations of the armature 20 are not transmitted to the movable contact 76, etc., the support spring 78 is not subject to any upward movement, which is different from the frame 75 (see Figure 77 (c)). As a result, the movable contact 77a can be brought into contact with the fixed contact 55a (not shown).

in a stabilized state.

  (d) is the next state of the above state (c) and represents a state where the armature 20a is drawn near the pole

magnetic 71a.

  In this state, the armature 20a (see Fig. 22 (c)) which has been further dissociated from the magnetic pole 71a by the impact vibrations is pulled closer to the magnetic pole 71a by its reaction. However, since the action results from the moment of inertia of only the armature 20, the kinetic energy is small and the support spring 78 is barely moved towards

the bottom.

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  Thus, since the support spring 78 is not moved upwards and is barely moved downwards, the displacement other than a torsion of the support spring 78 can be minimized, so that it is possible to reduce the rebound and at the same time the duration (life) of the spring of

support 78 can be increased.

  In addition, even though the projecting portion 36 formed on the upper surface of the sidewalls 21, 21f of the insulating support member 21b and the concave portion 35 formed to the frame 20 are formed in reverse, it is also

  possible to achieve an effect similar to this one.

  Moreover, although the projecting portion 36 is similar to a circular column in the sixth preferred embodiment of the invention, it goes without saying that the

  shape of the protruding portion 36 is not limited to that

  this. Still more, as described in the fourth preferred embodiment of the invention, since it is possible to absorb the impact vibrations of the armature 20 by causing a plastic sheet to intervene between the armature 20 and the magnetic pole 71, it is possible to reduce the rebound and the duration (life) of the spring of

suport 78 can be increased.

  Figures 25 to 29 show a seventh mode of

  preferred embodiment of the invention.

  Here, in a case where the elastic force of the movable contact spring 76 is enhanced to increase the contact pressure between the movable contact 77 and the fixed contact 55 in the fifth preferred embodiment of the invention, it is considered that the Insulating support member 21a is pushed upward by the reaction of movable contact spring 76 as shown in Fig. 23 (b) and engagement of engagement piece 33a which constitutes the unidirectional linking means 32a can be lost. (At this moment, the armature 19 is attracted to the magnetic pole 7lb with the

  engagement piece 33b which performs an axis or pivot).

41 2736201

  The seventh preferred embodiment of the invention is constructed to obtain a contact pressure

  stabilized even in such situations.

  An electromagnetic relay according to the seventh embodiment of the invention comprises: an electromagnet block 62, equipped with magnetic poles 71, 71 at both ends thereof, comprising an iron core 64 on which a coil 69 is wound and a permanent magnet 72; an armature block 18a comprising an armature 19, a movable contact spring 76, at both ends of which a movable contact 77 made of a piece of precious metal by volume is electrically welded, an insulating support member 21a, a support spring 78 extending from the center of the movable contact spring 76 in the direction orthogonal thereto and attached to the housing 51; a housing 51 equipped with a common terminal 58, a fixed contact terminal 56 to which a fixed contact made of precious metal end volume is electrically connected by electric welding and a coil terminal 60, in which the electromagnet block 62 and the armature block 18a are provided; and an envelope (not shown) attached to the outside of the housing 51, where the movable contact spring 76, the support spring 78, the armature 19, the magnetic pole 71 and the permanent magnet 72 are laminated in the order from the bottom of the housing 51, unidirectional connecting means 32a is composed of an engagement portion formed to the insulating support member 21a and a engaging portion, which is formed to the frame 19 and the movable contact spring 76 and the armature 19 are divided so as to cause them to operate independently via the

insulating support 21a.

  Fig. 28 is a sectional view of main parts showing a first contact pressure stabilization mechanism. An insulating support member made of insulating material such as synthetic resin, etc., whose cut is roughly channel-shaped, is integrally molded with the movable contact spring 76 in the center of the movable contact spring.

42 2736201

  76. An engagement piece 33 is formed on the upper surface of the sidewalls 21c, 21d of the

insulating support 21a.

  An armature 19 made of a soft magnetic material such as an electromagnetic soft iron, etc., and formed to be roughly plate-shaped is disposed at the top of the movable contact spring 76 and an opening 37 in which the side walls 21c, 21d formed at the element of

  insulating support 21a are inserted is formed to the frame 19.

  The side walls 21c, 21d of the insulating support member 21a and the engagement piece 33 are inserted into the opening 37 and engaged therewith, thereby

  movable contact spring 76 is separated from the frame 19.

  The magnetic pole 71 of the electromagnet block 62 and

  the permanent magnet 72 are arranged at the top of the frame 19.

  The permanent magnet 72 is roughly plate-shaped and the two ends thereof are magnetized to be of the same polarity with the central portion thereof magnetized to be of different polarity. The permanent magnet 72 is made to intervene between the mangetic poles 71, 71 which are the ends of the iron core 64. The unidirectional connecting means 32a is formed by the side walls 21c, 21d formed to the insulating support member 21a , whose cut is roughly channel-shaped as shown above, passing through the opening 37 formed to the frame 19 and the engagement piece 33 which is the engagement portion provided at the end portion lateral walls 21c, 21d being engaged with the opening 37 which is the portion to be engaged of

the frame 19.

  The first contact pressure stabilization mechanism is constituted by causing a magnetic flux condenser element 27a to be roughly projected in the center

  of the armature 19 in order to confront the permanent magnet 72.

  The actions of the magnetic flux condenser element

  27a are described in detail with reference to FIG.

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  The magnetic flux condenser element 27a is to condense the magnetic flux passing through the center of the armature 19 and the permanent magnet 72. Since the magnetic flux passes through a narrow path to be condensed by the flow condenser element magnetic force 21a, the magnetic attraction force acting between the central portion and the frame 19 and the permanent magnet 72 is made larger compared to the case where no element of condensation of

magnetic flux 27a exists.

  (a) represents a state where none of the movable contacts 77a, 77b are in contact with the fixed terminals 55a, 55b (not shown). In this state, the movable contact spring 76 is free of any bending and the forces acting on the frame 19 are only a force due to a magnetic flux passing through the central portion of the frame 19 and the permanent magnet 72 a force due to the magnetic flux passing through the magnetic pole 71a and the armature 19a and a force due to the magnetic flux passing through the magnetic pole 7b and the armature 19b. The engaging pieces 33a, 33b which constitute the unidirectional connecting means 32a are engaged with the frame 19, so that the unidirectional connecting means 32a does not descend.

not or does not emerge.

  (b) represents a state of rest where the armature 19a is magnetically attracted by the magnetic pole 71a and the movable contact 77a is brought into contact with the fixed contact a. However, the force due to the magnetic flux passing through the central portion of the armature 19 and the permanent magnet 72 is enhanced by the actions of the magnetic flux condenser element 27a, i.e., since the central portion of the frame 19 is attracted by the central portion of the permanent magnet 72, the engagement of the unidirectional connecting means 32a, 32a is reinforced, so the unidirectional connecting means 32a, 32a do not withdraw or does not detach himself from his commitment even by force

  due to the deflection of the contact spring 76.

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  Therefore, since the unidirectional connecting means 32a does not detach from the engagement thereof even by the bending of the movable contact spring 76 which is produced when the movable contact 77 is brought into contact with the fixed contact 55 it is possible to obtain a predetermined deflection of the movable contact spring 76. As a result, the contact pressure between the movable contact 77 and the fixed contact 55 is more stabilized.

  and the contact resistance can be more stabilized.

  In addition, in the seventh preferred embodiment of the invention, although the magnetic flux member 27a is formed of the same material as that of the frame 19, the material is not limited thereto for so long. it is a soft magnetic material whose saturation magnetic flux density is high and the magnetic permeability is high. The shape of it is not limited

to the above.

  Fig. 30 is a sectional view of main parts showing a second contact pressure stabilization mechanism, where a magnetic flux condenser element 27b is provided to protrude from the central portion of the permanent magnet 72 to confront

the frame 19.

  In an eighth preferred embodiment of the invention, the second contact pressure stabilization mechanism is used in place of the first contact pressure stabilization mechanism, it is possible to obtain the same effect as that of the seventh fashion

  preferred embodiment of the invention.

  Moreover, in the eighth preferred embodiment, although the magnetic flux condenser element 27b is made of the same material as that of the permanent magnet 72, it is not limited to the foregoing and may be of any other hard magnetic material, or soft magnetic material, whose saturation magnetic flux density is high

  and the magnetic permeability is great.

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  FIG. 31 is a sectional view of main parts showing a third contact pressure stabilization mechanism which is such that an engagement element 30a made of an elastic element, for example rubber, is made to intervene between

  the frame 19 and the insulating support member 21a.

  The actions of a ninth preferred embodiment of the invention in which an engagement member 30a of the third contact pressure stabilization mechanism

  is used is described, using Figure 32.

  (a) represents a state where the two movable contacts 77a, 77b are not in contact with the fixed contacts 55a, b (not shown). In this state, the movable contact spring 76 is free of any bending. As a result, the forces acting on the armature 19 are only a force due to a magnetic flux passing through the central portion of the armature 19 and the permanent magnet 72, a force due to the magnetic flux passing through the pole. magnetic 71a and the frame 19a and a force due to the magnetic flux

  passing through the magnetic pole 71b and the frame 19b.

  The engagement pieces 33a, 33b which constitute the unidirectional connection means 32a are engaged with the frame 19, thus the connecting means

  unidirectional 32a do not come off.

  (b) represents a state of rest where the armature 19a is magnetically attracted to the magnetic pole 71a and the movable contact 77a is brought into contact with the fixed contact a. However, although the movable contact 77 is brought into contact with the fixed contact 55, a bend is produced at the movable contact spring 76 and a compressive force is given to the engagement member 30a, the distance between the frame 19 and the insulating support magnet 21a is kept constant by a restoring force of the engaging member 30a which is an elastic member, i.e., since the engagement of the unidirectional connecting mechanism 32a is reinforced, the unidirectional link means 32a does not disengage from the commitment of

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  this one. As a result, since the movable contact spring 76 can achieve a predetermined deflection, the contact pressure between the movable contact 77 and the fixed contact 55 is more stabilized than in the seventh and eighth preferred embodiments of the invention. the kind the

  contact resistance is more stabilized.

  Fig. 33 is a sectional view of main parts showing a fourth contact pressure stabilization mechanism, o an engagement member 30b made of an elastic member, for example, a coil spring is made to intervene between

  the frame 19 and the insulating support member 21a.

  By a tenth preferred embodiment of the invention in which the fourth contact pressure stabilization mechanism is used in place of the third contact pressure stabilization mechanism, it is possible to obtain the effect identical to that which is obtained by an electromagnetic relay according to the

  ninth preferred embodiment of the invention.

  In addition, the material and shape of an engagement member 30a which is the third contact pressure stabilization mechanism and an engagement member 30b which is the fourth contact pressure stabilization mechanism are not limited to this

who is before.

  Figures 34 to 37 show an eleventh preferred embodiment of the invention. A movable contact spring 76, a support spring 78, a magnetic pole 71, a permanent magnet 17 and a frame 20 are laminated in the order of the bottom of the case 51. The eleventh preferred embodiment is such that a means unidirectional link 32b is used, which is constituted by the engagement portion provided on the side walls 21e, 21f of the insulating support member 21b passing through the openings 37b, 37b of the permanent magnet 17 and being engaged with the portion to be engaged, which is provided for the armature 20, so that the movable contact spring 76 and the armature 20 are separated and

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  operate independently. In the sixth preferred embodiment described above, in a case where an effort is made to ensure that the elastic force of the movable contact spring 76 is increased in order to increase the contact pressure between the movable contact 77 and the fixed contact 55, the insulating support member 21b is pushed upwards by a repulsive force of the movable contact spring 76 as shown in FIG. 24 (b), so that the concave engagement portion 35a is considered which constitutes the unidirectional connecting means 32b is disengaged from the projecting projection portion 36a. (At this time, the armature 20 is attracted to the magnetic pole 7lb with the projecting portion 36b making an axis or a pivot). Even in this state, with the eleventh preferred embodiment of the invention, it is possible to obtain a

stabilized contact pressure.

  Fig. 37 is a sectional view of main parts showing a fifth contact pressure stabilization mechanism which is used in the eleventh preferred embodiment of the invention, an insulating support member 21b made of insulating material such as the synthetic resin, etc., and formed to be roughly channel-shaped is integrally molded to the central portion of the movable contact spring 76 together with the movable contact spring 76, and a projecting portion similar to a circular column 36 is formed on the upper surface of the side walls 21e, 21f of the insulating support member 21b, the section of which is

roughly channel-shaped.

  A magnetic pole 71 of the block of the electromagnet 15 and the permanent block 17 are arranged at the top of the movable contact spring 76 and an opening 37b in which the projecting portion 36 formed on the upper surface of the side walls 21e, 21f of the channel-shaped insulating support member 21b is inserted, is formed to the magnet

permanent 17.

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  An armature 20 made of soft magnetic material such as electromagnetic soft iron, etc., and formed to be roughly plate-shaped is disposed at the top of the magnetic pole 71 and the permanent magnet 17, a concave portion 35 which is engaged with the protruding portion 36 formed on the upper surface of the side walls 21e, 21f of the insulating support member 21b is formed below

of the frame 20.

  The unidirectional connecting means 32b consists of a projecting portion 36 of the engagement portion formed on the upper surface of the side walls 21e, 21f and a concave portion 35 of the portion to be engaged, which is

formed on the frame 20.

  The fifth contact pressure stabilization mechanism is such that a magnetic flux condensing element 27c is provided to protrude from the central portion of

  the armature 20 to confront the permanent magnet 17.

  By the eleventh preferred embodiment of the invention thus constructed, it is possible to obtain the same effect as that in the seventh embodiment.

preferred embodiment of the invention.

  Fig. 38 is a sectional view of main parts showing a sixth contact pressure stabilization mechanism; o a magnetic flux condenser element 27d is provided to protrude from the central portion of the permanent magnet 17 so as to

to confront the frame 20.

  In the twelfth preferred embodiment in which the sixth contact pressure stabilization mechanism is used on the plate of the fifth contact pressure stabilization mechanism, it is possible to obtain the same effect as that in the eleventh mode of

  preferred embodiment of the invention.

  Fig. 39 is a sectional view of main parts showing a seventh contact pressure stabilization mechanism, wherein the seventh contact pressure stabilization mechanism is such

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  that an engagement member 30c made of elastic material such as rubber is provided between the frame 20 and the bottom

  of the insulating support member 21b.

  In the thirteenth preferred embodiment in which the seventh contact pressure stabilization mechanism is used, it is possible to obtain the same effect as that in the ninth preferred embodiment of the invention. FIG. 40 is a sectional view of main parts showing an eighth contact pressure stabilization mechanism, where the latter is such that an engagement element 30d made of an elastic element such as a helical spring intervenes between the frame 20

  and the bottom of the insulating support member 21b.

  In the fourteenth preferred embodiment in which the eighth contact pressure stabilization mechanism is used in place of the seventh contact pressure stabilization mechanism, it is possible to obtain the same effect as that in the thirteenth mode of

  preferred embodiment of the invention.

  Figures 41 to 43 are views showing a fifteenth preferred embodiment of the invention. An electromagnetic relay according to the fifteenth preferred embodiment of the invention comprises: an electromagnet block 62 comprising an iron core 64 on which a coil is wound and which is provided with the magnetic poles 71, 71 at both ends of this and a permanent magnet 72; an armature block 18a comprising an armature 19, a movable contact spring 76, at both ends of which a movable contact 77 made of a piece of precious metal by volume is fixed by electric welding, an insulating support member 21a and a spring support 78 extending from the center of the movable contact spring 76 in the direction orthogonal thereto is attached to the housing 51; a housing 51 equipped with a common terminal 58, a fixed contact terminal 56 to which a fixed contact 55 made of a piece of precious metal by volume is electrically connected by

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  electrical welding and a coil terminal 60 and to which the electromagnet block 62 and the armature block 18a are fixed; and an envelope (not shown) externally attached to the housing 51 and is constructed such that the movable contact spring 76, the support spring 78, the frame 19, the magnetic pole 71 and the permanent magnet 72 are rolled in order from the bottom of the housing 51, a unidirectional connecting means 32a is formed of an engagement portion formed to the insulating support member 21a and the engaging portion, which is formed to the frame 19, and the movable contact spring 76 and the armature 19 are separated from each other so as to operate independently

  through the insulating support member 21a.

  An insulative support member 21a made of insulating material such as synthetic resin, etc., and formed to be roughly channel-shaped is integrally molded at the center of the movable contact spring 65 along the movable contact spring 76. An engagement piece 33 is formed at the side walls 21c, 21d which are

  free ends of the insulating support member 21a.

  An armature 19 made of a soft magnetic material such as electromagnetic soft iron and formed to be roughly plate-shaped is disposed at the top of the movable contact spring 76 and an opening 37 in which the side walls 21c, 21d formed at the 21a support member are inserted, is formed to the frame 19, where the side walls 21c, 21d of the insulating support body 21a and the engagement piece 33 are inserted into the opening 37 and engaged therewith, in this way the spring of

  movable contact 76 and the frame to be separated.

  The magnetic pole 71 of the electromagnet block 62 and

  the permanent magnet 72 are arranged at the top of the frame 19.

  The permanent magnet 72 is formed to be roughly plate-shaped where the two ends thereof are magnetized to be of the same polarity and the central portion thereof is magnetized to be of the other polarity. And the permanent magnet 72 is intended to intervene

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  between the magnetic poles 71, 71 which are at the ends of the

iron core 64.

  The unidirectional connecting means 32a is constituted so that the side walls 21c, 21d formed at the insulating support member 21a, whose cut is formed.

  to be roughly channel-shaped as described above

  above, are passed through the opening 37 formed to the frame 19 and the engagement piece 33 which is the engagement portion provided at the ends of the side walls 21c, 21d is engaged with the opening 37 which is the

  serving portion of the frame 19.

  A contact pressure stabilization mechanism is such that a magnetic flux condenser element 27a is provided to protrude from the central frame portion 19

  to confront the permanent block 72.

  The magnetic flux condenser element 27a is to condense the magnetic flux passing through the central portion of the armature 19 and the permanent magnet 72. Since the magnetic flux is concentrated to pass through a narrow path through the condenser element magnetic flux 27a, a magnetic attraction force acting between the central portion of the frame 19 and the permanent magnet block 72 is made larger compared to a case

  no magnetic flux condenser element 27 exists.

  As a result, even if the movable contact 77 is brought into contact with the fixed contact 55 and a deflection is produced at the movable contact spring 76, the unidirectional connecting means 32a does not detach from engagement and a predetermined spring deflection. movable contact 76 can be obtained. As a result, the contact pressure between the movable contact 77 and the fixed contact 55 is stabilized and the

  contact resistance is also stabilized.

  In the fifteenth preferred embodiment of the invention, by the displacement stop means 25a which is provided in the casing 51 in such a state that it is brought into contact with the upper part of the support spring 78 or slightly apart from it, it is possible

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  to regulate, by a magnetic attraction force which is produced by the magnetic flux condenser element 27a, an upward movement of the support spring 78 due to the upward movement of the armature 19. As a result, is possible to increase the life (life) of the support spring 78 and it is also possible to obtain a more stabilized contact pressure, so it is possible

* to prevent more a rebound of contacts.

  FIGS. 44 to 46 represent a sixteenth preferred embodiment of the invention, where a movable contact spring 76, a support spring 78, a magnetic pole 71, a permanent magnet 17 and a frame 20 are laminated in the order from the bottom of the housing 51, the side walls 21e, 21f of the insulating support member 21b pass through the openings 37b, 37b of the permanent magnet by the engagement portion formed at the end of the element 21b of insulating support and the portion to engage the armature 20, so the unidirectional connecting means 32b is constructed, the movable contact spring 76 and the armature 20

  are separated in order to function independently.

  An insulating support member 21b made of an insulating material such as synthetic resin, whose cut is roughly channel-shaped, is integrally molded to the central portion of the movable contact spring 76 along the movable contact spring. 76 and a projecting portion in the form of a circular column 36 is formed on the upper surface of the side walls 21e, 21f which are free ends of the support member

  insulator 21b, whose cut is in the form of a channel.

  The magnetic pole 71 of the electromagnet block 15 and the permanent magnet 17 are arranged at the top of the movable contact spring 76 and an opening 37b in which a projecting portion 36 formed on the upper surface of the side walls 21e, 21f of the insulating support element in

  2lb channel shape is formed on the permanent magnet 17.

  An armature 20 made of a soft magnetic material such as electromagnetic soft iron is formed to be

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  coarsely channel-shaped is disposed at the top of the magnetic pole 71 and the permanent magnet 17 and a concave portion 35 which is engaged with the projecting portion 36 formed on the upper surface of the side walls 21e, 21f of the insulating support 21b is formed below

of the frame 20.

  The unidirectional connecting means 32b is constituted by the projecting portion 36 of the engagement portion formed on the upper surface of the side walls 21e, 21f of the insulating support member 21b and the concave portion 35 of the portion to be engaged. who is trained on

the frame 20.

  The contact pressure stabilization mechanism is such that a magnetic flux condensing element 27c is provided to protrude from the central portion of the frame

  to confront the permanent magnet 17.

  In the sixteenth preferred embodiment of the invention, by the displacement stop means 25b provided in the housing 51 in such a state that it is brought into contact with the lower portion of the support spring 78 or slightly to of the latter, it is possible to regulate, by a magnetic attraction force which is produced by the magnetic flux condenser element 27c, a downward movement of the support spring 78 due to the downward movement of the In addition, it is possible to increase the life (life) of the support spring 78 at the same time as it is possible to obtain a more stabilized contact pressure, so that it is possible to prevent rebound

contacts.

  Figures 47 to 49 are views representing a

  seventh preferred embodiment of the invention, o 1 is a housing which is provided with an insulating substrate 2 made of ceramic or glass-coated metal, etc., and respective terminals such as a fixed contact terminal 5 formed by pressure molding a copper alloy thin plate, a common terminal 8, a coil terminal 11, etc., and comprises

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  a fixed contact 4 made of paste of thick film of metal

precious sintering-molding.

  Thereupon, a conventional housing 51 is provided with respective terminals such as a fixed contact terminal 56, a common terminal 58, a coil terminal 60, etc., and a fixed contact 55 and the respective terminals such as a terminal fixed contact 56, a common terminal 58, a coil terminal, etc. which are formed to a predetermined shape by pressure molding of a conductive thin plate of copper alloy are molded by insert so that one end of those it can project from below the housing 51 (see Figure 69 and following of the conventional example). However, there is such a problem that since the shape of each of the terminals such as the fixed contact terminal 56 is complicated, the die-molding metal dies are made complicated, which causes the

production cost to increase.

  In addition, since in case 51 fixed contact terminals 56, etc. are molded by insert with the synthetic resin, etc., the thermal conductivity thereof is low. If electric current is circulated to the coil 69, a temperature difference is produced at the respective terminals 56, 58, 60, at the fixed contact 55, at the respective terminal junction portions 57, 59, 61, etc. of the thermo-electromotive force is produced between the fixed contact terminal 56 and a common terminal 58. If they are used for small power circuits, the force

  thermo-electromotive is a problem.

  In addition, heat is generated by the contact resistance of the contacts and the electrical load, depending on the current and voltage conditions under which they are used and the heat is not dissipated because of their low thermal conductivity, resulting so in fusion and solder contacts and finally a

  shortening of the duration (life) of the contacts.

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  Still further, since the fixed contact terminals 56 and the common terminals 58 which are signal lines are insert molded, the high frequency characteristics of these are insufficient. Therefore, for high frequency communication such as mobile communication, digital communication, etc., it is desired that an electromagnetic relay having high characteristics

  higher frequency be developed.

  In addition, since the stationary contacts 55 are formed by electrically welding a bulky piece of precious metal to the fixed contact junction portions 57, an unequalness of the fixed contacts 55 frequently results from a poor state of electrical welding or patch molding. and the complexity of the shape of the terminals, so the distance between the fixed contacts 55 and the movable contacts 77 is always different at each contact, resulting in unequal contact pressure or respective contacts, so the rebound is favored and at the same time the operating period is unbalanced. Finally, the

  reliability of the electromagnetic relay is made bad.

  This happens frequently especially in relays

  electromagnetic contacts.

  In addition, if the weld is insufficient, the thermal resistance between the fixed contact 55 and the fixed contact junction portion 57 is made larger, and in particular, if they are used in a state where an arc discharge occurs. product, the wear of the contacts is severe, leading in this way

  the duration (life) of the contacts to be shortened.

  The seventeenth preferred embodiment of the invention is provided with a unidirectional connecting means 32a which is constituted such that the movable contact spring 76, the support spring 78a, the armature 19, the magnetic pole 71 and the permanent magnet 72 are laminated in order from the bottom of the housing 1, where the movable contact spring 76 and the armature 19 are separated by the engagement portion provided to the support member.

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  insulation 21a and the portion to be engaged, which is provided for

  the frame 19, in order to function independently.

  Figs. 50 to 52 are views showing a housing 1 of the seventh embodiment of the invention, a fixed contact terminal junction portion 6, a common terminal joint portion 9, a terminal terminal joint portion, coil 12, etc. which are sintered-molded by a copper alloy thick film paste, etc., are formed below the insulating substrate 2 and as necessary the respective conductor portions of a common terminal conductor portion 10 of a coil terminal conductor portion 13, are sintered-molded with a thick copper alloy metal film paste, so each of them is electrically connected to the fixed junction part 6, the part joint terminal junction 9 and

  the coil terminal junction portion 12.

  A fixed contact conductor portion 7 is sintered-molded with an alloy thick metal film paste

  of copper on the upper surface of the insulating substrate 2.

  A number of through-holes 3 are formed at a predetermined location of the insulating substrate 2, wherein the fixed contact terminal 5, the common terminal 8, the coil terminal 11, etc. are inserted from below the insulating substrate 2 and fixed in it. The respective terminals 5, 8, 11 are electrically connected to the respective joining portions 6, 9, 12 formed below the insulating substrate 2 by welding. In addition, the fixed contact lead portion 7 and the fixed contact terminal junction portion 6 may be electrically connected to one another by promptly using a known method, for example, a thick film paste. metallic is

  sintered-molded inside through holes 3.

  In addition, it is possible to form the fixed contact terminal lead portion 7, the common terminal conductor portion 10, the coil terminal lead portion 13 and the respective joint portions 6, 9, 12, on the two surfaces of the insulating substrate 2 in

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  3. In addition, it is also acceptable to form notches at the end portions of the insulating substrate instead of the holes.

through 3.

  The fixed terminal 4 is formed on the upper part of the fixed contact junction portion 6 by printing and sintering a thick film paste in which predetermined types of metals are mixed, by a previously known screen printing method. As a result, it is possible to easily adjust the contact height by controlling only the thickness of the thick film paste to be printed. In addition, since the respective junction portions 6, 9, 12 and each of the fixed contact lead portions 7, common terminal lead portion 10, common terminal lead portion 13, etc., can be formed as well as the fixed contact 4, no inequality is produced for the height of the fixed contact 4, differing from the fixed contact 55 in which a piece of precious metal volume made of coating material is fixed and formed on the upper surface of the contact terminal fixed 56 integrated with the

  base 52 as a conventional electromagnetic relay.

  Figs. 53 and 54 are views which explain an armature block 18c according to the seventeenth preferred embodiment of the invention. The armature block 18c consists of a movable contact spring 76, an insulating support member 21a and a support spring 78 extending from the central portion of the movable contact spring 76 in the direction orthogonal thereto. However, an insulating support member 21a made of insulating material such as synthetic resin, etc., whose cut is roughly channel-shaped is molded by insert along the movable contact spring 76 to the central portion of the spring of the invention. movable contact 76 and an engagement piece 33 is formed on the upper surface of the side walls 21c, 21d of the element

insulating support 21a.

  In addition, the support spring 78 which is mechanically and electrically in one piece with the spring of

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  movable contact 76 is formed to extend from the longitudinal center of the movable contact spring 78 in the direction orthogonal thereto and further the end end thereof is folded roughly at right angles and is inserted into a predetermined through hole 3 provided to the insulating substrate 2 of the housing 1, where the latter is welded to the common terminal junction portion 6 to provide a

  electrical connection with common terminal 8.

  Since the support spring 78a is directly welded to the common terminal junction portion 6, the stability of the

this one is further increased.

  An armature 19 made of soft magnetic material such as electromagnetic soft iron, etc., and formed to be roughly channel-shaped is disposed at the top of the movable contact spring 76, an opening 37 in which the side walls 21c, 21d formed at the insulating support member 21a is inserted, is formed to the frame 19 and the side walls 21c, 21d of the support member 21a are inserted into the opening 37 and engaged therewith together with the workpiece. commitment 33, so a way

  unidirectional link 32a is formed.

  In addition, if a block frame 38 is provided for the frame block 18c shown in Figs. 55 and 56, the attachment property thereof with the insulating substrate 2 is greatly increased, thereby bringing about reliability.

  of it to be further increased.

  In the seventeenth preferred embodiment of the invention, it is possible to reduce the production of the rebound and simultaneously to increase the life (life) of the

support spring 78a.

  In addition, as already explained in the fourth preferred embodiment of the invention, since it is possible to absorb impact vibration of the frame 19 by causing a plastic sheet to intervene between the armature and the magnetic pole, it is possible to reduce the production of the rebound and to increase further the

  duration (life) of the support spring 78a.

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  In addition, in the seventeenth preferred embodiment of the invention, unidirectional connecting means 32a is used as an armature block and the movable contact spring 76, the support spring 78a, the armature 19, the magnetic pole 71 and the permanent magnet 72 are laminated in order from the bottom of the case 1. However, the arrangement thereof is not limited thereto. It will be said that with a unidirectional connecting means 32b used, the movable contact spring 76, the support spring 78a, the magnetic pole 71, the permanent magnet 17 and the armature 20 can be rolled in the order from the bottom of the housing 1. Moreover, even in the frame block in which the frame 75 and the movable contact spring 76 are made in one piece with each other by the element of insulating support 79, it is also possible to obtain the similar effect by providing it with a stop means which regulates the upward or downward movement of the support spring in line with the displacement of the frame. In the seventeenth preferred embodiment of the invention, the temperature distribution is made small in the insulating substrate 2 since the thermal conductivity is greater because of the use of an insulating substrate.

  made of ceramic, etc., so the thermo force

  The electromotive circuit between the fixed contact terminal 5 and the common terminal 8 is made small, the insulating substrate 2 becomes optimal for a small signal control and the signal noise is minimized. Because of this, it is possible to realize

  an electromagnetic relay of higher perofrmance.

  In addition, since the fixed contact 4 and the fixed contact conductor portion 7 are sintered-molded with a thick metal film paste in addition to higher thermal conductivity due to the use of the insulating substrate 2, the thermal resistance between the fixed contact 4 and the fixed contact conductor portion 7 is made small, so even if it is used under the conditions of

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  production of an arc discharge, the life of the contact can be lengthened. Still further, since a thick film paste with which predetermined types of metals are mixed is printed in a predetermined pattern and sintered to form a substrate, it is easy to adjust the height of the fixed contacts, so the mass production efficiency of these is greatly increased with minimized contact height inequality and the terminal matrix is made more

easy.

  In particular, in an electromagnetic relay having a number of contacts, the contact pressure between the respective contacts is stabilized to cause the operating period to be synchronized. As a result, in general, the reliability of the electromagnetic relays will be greatly increased. In addition, by using a ceramic substrate, it is easy to form a microstrip line path and a coplanar line path, so that fixed contact lead portions 7 and common terminal conductor portions 10 are formed. of a microstrip line path and a coplanar line path and it is possible to constitute an electromagnetic characteristics relay

higher frequency.

  An eighteenth preferred embodiment (not shown) of the invention is such that a movable contact (e.g., reference numeral 77 in Fig. 54) is formed by sintering-molding a thick film metal of a precious metal, etc., in addition to the seventeenth preferred embodiment of

the invention.

  A moving contact is formed by printing and sintering

  molding a thick film paste with which a predetermined type of metal is mixed, by an already known screen printing process, at both ends of the movable contact spring 76. As a result, the thermal resistance between the movable contact 77 and the movable contact spring 76 is made weaker and it is possible to extend the duration of the

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  contact (life) even if it is used in

  production conditions of an arc discharge.

  Still further, since it is possible to form a thick film paste with which a predetermined type of metal is mixed, by printing and sintering-molding thereon into a predetermined pattern by an already known screen printing process, it is easy to adjust the contact height and mass production output can be increased by a lot with the unevenness of the precision

minimized.

  In particular, in an electromagnetic relay having a number of contacts, the contact pressure between the respective contacts is stabilized and the operating period is synchronized, thus the reliability of the

  Electromagnetic relay can be increased by a lot.

  FIGS. 57 to 59 show a nineteenth preferred embodiment of the invention, where a housing is provided with an insulating substrate 2 made of ceramic or glass-coated metal, etc., and the respective terminals of FIG. a fixed contact terminal 5 formed by pressure molding of a copper alloy thin plate, etc., a common terminal 8, a coil terminal 11, etc., is furthermore equipped with a contact fixed 4 made of a thick film paste of sintered metal-molded of a precious metal, etc. Still further, it is provided with a unidirectional linkage means 32a constructed so that the movable contact spring 76, the support spring 78a, the frame 19, the magnetic pole 71, the permanent magnet 72 are rolled in order from the bottom of the housing 1 and the movable contact spring 76 and the frame 19 are separated and designed to operate independently by the engagement portion provided to the insulating support member 21a and the portion to engaging, which is provided for the frame 19, o a contact pressure stabilization mechanism, in which a magnetic flux condenser element 27a is provided to protrude from the central frame portion 19 in order to confront the permanent magnet

72, is used.

62 2736201

  In the nineteenth preferred embodiment of the invention, which is so constructed, it is possible to obtain an effect similar to that of the eighteenth preferred embodiment and at the same time it is also possible to obtain an effect similar to that of the seventh mode of

preferred embodiment.

  In addition, the pressure contact stabilization mechanism is not limited to the flow condenser element

magnetic 27a.

  FIGS. 60 to 62 show a twentieth preferred embodiment of the invention, where a housing is provided with an insulating substrate 2 made of ceramic or glass-coated metal, etc., fixed contact terminal groups. 5 formed by pressure molding of a copper alloy thin plate, etc., common terminals 8, coil terminals 11, etc., and is further provided with a fixed contact 4 made of a thick film paste. of sintered-metal precious metal, etc., o a contact pressure stabilization mechanism in which a magnetic flux condenser element 27c is provided to protrude from the central portion of the frame 20 to confront the magnet

permanent 17, is used.

  In the twentieth preferred embodiment of the invention as constructed above, it is possible to obtain an effect similar to that of the nineteenth mode of

  preferred embodiment of the invention.

  FIGS. 63 to 65 show a twenty-first preferred embodiment of the invention, in which a displacement stop means 25c is provided to the block frame 38 in such a state that it is in contact with the upper part of the support spring 78a or slightly apart from this upper part, in addition to the nineteenth mode

  preferred embodiment of the invention.

  In the twenty-first preferred embodiment of the invention as constructed above, since it is possible to regulate, by a magnetic attraction force produced by the magnetic flux condenser element 27a, the

63 2736201

  upward movement of the support spring 78a, which is produced along the upward movement of the armature 19, it is possible to further increase the duration (life) of the support spring 78a and simultaneously possible to obtain a contact pressure more stabilized, so the bouncing of the contacts can be further prevented from occurring. FIGS. 66 to 68 show a twenty-second preferred embodiment of the invention, in addition to the twentieth preferred embodiment of the invention, a displacement stop means 25d is provided to the block frame 38 in a in such a state that it is in contact with the lower portion of the support spring 78a or slightly at

part of this lower part.

  In the twenty-second preferred embodiment of the invention as built above, since it is possible to regulate, by a magnetic attraction force produced by the magnetic flux condenser element 27c, the downward movement of the support spring 78a, which is produced along the downward movement of the armature 20, it is possible to further increase the life (life) of the support spring 78a and simultaneously to increase a more stabilized contact pressure. , so the

  Bouncing contacts can be prevented from occurring.

64 2736201

Claims (22)

  An electromagnetic relay comprising: an electromagnet block comprising an iron core on which a coil is wound and a permanent magnet; a frame block comprising an armature, a movable contact spring, an insulating support member and a support spring extending from a center of the movable contact spring in a direction perpendicular thereto and attached to a housing wherein the armature and the movable contact spring are formed in one piece with each other by the insulating support member, which can switch inversely between two magnets centered around the support spring; the housing having a common terminal, a fixed contact terminal and a coil terminal and to which the electromagnet block is attached; and an envelope fixed externally to the housing; characterized by further comprising stop means (24a, 24b) which regulates upward or downward movement of the support spring (78), which displacement   is produced by tilting the armature (19).   An electromagnetic relay according to claim 1, characterized in that the stop means (24a; 24b) which regulates the upward or downward movement of the support spring (78) is provided to the housing (51) in a such that the stop means is in contact with an upper portion or an upper portion of the support spring or slightly apart from that upper portion or lower portion. Electromagnetic relay according to Claim 1, characterized in that the stop means (24a; 24b) which regulates the upward or downward movement of the support spring (78) is provided below the permanent magnet. (72) or on an upper surface of a housing bottom (51) in such a state that the stop means is in contact with the 2736201   under or an upper surface of the insulating support member (79) of the reinforcing block or slightly apart from the   below or the upper surface of this element (79).   An electromagnetic relay according to claim 1, characterized in that the stop means (24; 24b) which regulates the upward or downward movement of the support spring (78) is provided on the upper surface or below. the insulating support member (79) of the reinforcing block in such a state that the stop means is in contact with the underside of the permanent magnet (72) or the upper surface of the housing bottom (51) or slightly to   from this bottom or top surface.   An electromagnetic relay comprising: an electromagnet block comprising an iron core on which a coil is wound and a permanent magnet; an armature block comprising a frame, a movable contact spring, an insulating support member and a support spring extending from a center of the movable contact spring in a direction perpendicular thereto and attached to a housing ; the housing being provided with a common terminal, a fixed contact terminal and a coil terminal, to which the electromagnet block and the armature block are fixed; characterized in that the armature (19) and the insulating support member (79) are independently constituted, the armature block is provided with a unidirectional connecting mechanism (32a) which can transmit the displacement of the armature (19) in one direction and the movable contact spring (76) and the armature (19) are both caused to switch inversely between two magnetic poles (71) by excitation of the coil, centered around the support spring (78).   Electromagnetic relay according to claim 5, characterized in that the unidirectional connecting mechanism (32a) is constructed such that the movable contact spring (76), the support spring (78), the insulating support member ( 79), the armature (19), the permanent magnet 66 2736201   (72) and the magnetic poles (71) are arranged in order from a housing base (51), the engagement portion is raised upward by engagement of the engagement portions attached to the element insulating support member (79) with the parts to be engaged, which is fixed to the armature (19), using the fact that the armature (19) is attracted upwards or towards one of the magnetic poles (71) by a magnetic flux of the permanent magnet (72) or a magnetic flux   produced by excitation of the coil.   An electromagnetic relay according to claim 6, characterized in that the unidirectional connecting mechanism (32a) consists of an engagement portion attached to the insulating support member (79) and a engaging portion, which is attached to the armature (19) and the engagement portion is engaged with the engaging portion through an opening (37) formed to the armature (19)   or a lateral portion of the frame (19).   An electromagnetic relay according to claim 6 or 7, characterized in that the unidirectional connecting means (32a) consists of an engagement piece of engagement portions formed at the free end of the insulating support member (79a). ) and an opening (37) of the engaging part, which is fixed to the armature (19), the engaging part of the insulating support member passes through the opening (37) of the armature ( 19), and when the armature (19) is moved by being drawn into any one of the magnetic blades (71) in a predetermined direction, the transmission of vibrations to the contact spring due to a collision between the armature (19) and the magnetic pole (71) is attenuated and lightened by the unidirectional connection means. Electromagnetic relay according to claim 5, characterized in that the unidirectional connecting means (32a) is constructed so that the movable contact spring (76), the support spring (78), the insulating support member ( 79), the permanent magnet (72), the magnetic poles (71) and the armature (19) are arranged in order from 67 2736201   of a housing bottom (51), an engagement portion is pressed down by engagement of the engagement portions attached to the insulating support member (79) with the engaging portions, which are attached to the armature (19), using the fact that the armature (19) is attracted downwards or at the magnetic pole (71) by a magnetic flux of the permanent magnet (72)) or a magnetic flux produced by excitation of the coil. An electromagnetic relay according to claim 9, wherein the unidirectional connecting means (32a) consists of an engagement portion attached to the support member (79) and a engaging portion which is attached to the frame ( 19) and the engagement portion is engaged with the engaging portion through an opening (34) formed to the permanent magnet (72) or a lateral portion thereof. An electromagnetic relay according to claim 9 or 10, characterized in that the unidirectional connecting means (32a) consists of a convex portion of engagement formed at the free end of the insulating support member (79) and a portion concave engaging member, which is attached to the frame (19), the concave engagement portion of the insulating support member (19) passes through the opening (37) formed to the permanent magnet (72) and when the armature (19) is moved by being attracted to any one of the magnetic poles (71) by exciting the coil in a predetermined direction, transmitting the vibrations to the contact spring due to a collision between the armature ( 19) and the magnetic poles (71) is attenuated or relieved by the unidirectional link means.   An electromagnetic relay according to claim 6 or 9, characterized in that a contact pressure stabilization mechanism is provided whereby the contact pressure between the movable contact and the stationary contact is prevented from being lowered, since predetermined deflection of the contact spring is not achieved due to weakening or lightening of the commitment of the medium 68 2736201   unidirectional connection due to the deflection of the contact spring which is produced when the moving contact is   brought into contact with the fixed contact.   An electromagnetic relay according to claim 12, characterized in that the contact pressure stabilization mechanism is a magnetic flux condensing element (27a) which can condense the magnetic flux passing through almost a center of the armature (19). ) and the permanent magnet (72).   Electromagnetic relay according to claim 13, characterized in that the magnetic flux condensing element (27a) is provided almost in the center of the armature (19) which confronts the permanent magnet (72).   Electromagnetic relay according to claim 13, characterized in that the magnetic flux condensing element (27a) is provided almost in the center of the permanent magnet (72). which confronts the frame (19).   Electromagnetic relay according to Claim 12, characterized in that the contact pressure stabilization mechanism is an engagement piece comprising an elastic element which intervenes between the armature (19) and   the insulating support member (79).   Electromagnetic relay according to claim 16, characterized in that the engagement piece is a spring flat or helical spring.   Electromagnetic relay according to claim 16, characterized in that the engagement piece is made of rubber   analogous to a circular or square column.   An electromagnetic relay according to claim 13, characterized in that a displacement stop means (24a) which regulates an upward movement of the support spring (78), which is produced in line with a pulling force. magnetic element by the magnetic flux condensing element (27a), is provided in contact with or slightly apart from an upper part of the support spring, or the displacement stop means (24b) which regulates a displacement towards the bottom of the support spring (78), which is 69 2736201   produced in line by a magnetic attraction force by the magnetic flux condensing element (27a), is provided in contact with the lower portion of the support spring or slightly apart from it.   20. Electromagnetic relay according to any one of   preceding claims, characterized in that the housing   (51) is provided with an insulating substrate made of ceramic or glass-coated metal, a fixed contact made of a sintered thick film formed on the insulating substrate, an armature block and a fixing portion to which the electromagnet block is attached and the insulating substrate is provided with a coil terminal, a common terminal and a fixed contact terminal.   21. Electromagnetic relay according to any one of   preceding claims, characterized in that the contact   mobile formed at both ends of the movable contact spring   is made of a thick sintered-molded film.   22. Electromagnetic relay according to any one of   preceding claims, characterized in that a sheet   of plastic is made to intervene between the armature (19) and a magnetic pole (71).