EP0355817A2 - Relais électromagnétique - Google Patents

Relais électromagnétique Download PDF

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Publication number
EP0355817A2
EP0355817A2 EP89115585A EP89115585A EP0355817A2 EP 0355817 A2 EP0355817 A2 EP 0355817A2 EP 89115585 A EP89115585 A EP 89115585A EP 89115585 A EP89115585 A EP 89115585A EP 0355817 A2 EP0355817 A2 EP 0355817A2
Authority
EP
European Patent Office
Prior art keywords
movable
movable contact
contacts
base
portions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89115585A
Other languages
German (de)
English (en)
Other versions
EP0355817A3 (fr
Inventor
Ryuichi C/O Omron Tateisi Elec. Sato
Kiyoji C/O Omron Tateisi Elec. Inoue
Hiroyuki C/O Omron Tateisi Elec. Sagawa
Toshihiko C/O Omron Tateisi Elec. Seki
Masayuki C/O Omron Tateisi Elec. Noda
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omron Corp
Original Assignee
Omron Tateisi Electronics Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP63212909A external-priority patent/JP2687471B2/ja
Priority claimed from JP24025388A external-priority patent/JPH0287434A/ja
Priority claimed from JP10992989A external-priority patent/JPH02288127A/ja
Priority claimed from JP11322989A external-priority patent/JPH02291626A/ja
Priority claimed from JP11643189A external-priority patent/JP2773236B2/ja
Application filed by Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Publication of EP0355817A2 publication Critical patent/EP0355817A2/fr
Publication of EP0355817A3 publication Critical patent/EP0355817A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays
    • H01H51/2272—Polarised relays comprising rockable armature, rocking movement around central axis parallel to the main plane of the armature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/0062—Testing or measuring non-electrical properties of switches, e.g. contact velocity
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H49/00—Apparatus or processes specially adapted to the manufacture of relays or parts thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/18—Movable parts of magnetic circuits, e.g. armature

Definitions

  • the present invention generally relates to a relay and more particularly, to an electromagnetic relay arranged to selectively open or close contacts through pivotal movements of an armature block or movable member.
  • an electromagnetic relay which includes a housing constituted by a base and a casing, an electromagnet block having an approximately U-shaped core bent at opposite ends to form pole pieces and a coil wound onto said core through a spool, a permanent magnet assembled between said pole pieces and magnetized by the same polarity at its portions confronting said pole pieces, with its intermediate portion being magnetized by a polarity opposite thereto, and an armature block having its opposite ends respectively confront said pole pieces, with a protrusion formed approximately at its central portion being pivotally supported in a concave groove provided at a central part of said permanent magnet, said electromagnet block, said permanent magnet and said armature block being accommodated in said housing.
  • movable contact pieces each supported at central portions are provided at the opposite sides of the armature block, and movable contacts are provided at opposite ends of the respective movable pieces for selective contacts and spacing with respect to fixed contacts of the base, while connector pieces in a T-shape are provided at the central portions of the respective movable contact pieces to project sidewise therefrom, whereby the movable contact pieces and movable contact terminal provided on said base are electrically connected through said connector pieces.
  • the fixed contacts are disposed on the base, and the movable contacts are provided at opposite ends of the movable contact pieces of the armature block, while said armature block is supported on the permanent magnet block accommodated in the base to be assembled, the positional relation between the fixed con­tacts and movable contacts affects the accuracy for assem­bling the electromagnet onto the base, and that for assembling the permanent magnet onto the electromagnet block.
  • the position­al relation between the pole face of the core for the electromagnet block and the pole portion of the armature block also affects the assembling accuracy of the electro­magnet onto the electromagnet block.
  • the positional relations between the principal parts which may determine the working characteristics of the electromagnetic relay depend on the assembling accuracy of the respective parts, even if the dimensional accuracies of the four parts such as the base, electromagnet block, permanent magnet and armature block are sufficiently high in themselves. Accordingly, errors produced during assembly of the respective parts are accumu­lated, thus giving rise to large errors in the positional relations between the principal parts, which may scatter among individual electromagnetic relays. Consequently, working characteristics are not uniform from product to product, and troublesome procedures become necessary for the adjustments, thus requiring much man-hour, with a simultane­ous increase of the manufacturing cost.
  • an essential object of the present invention is to provide an electromagnetic relay which has less accumulation of errors during assembly of parts, thereby making it possible to determine the positional relation between principal parts at high accuracy, with adjustments of contact pressure being also facilitated.
  • Another object of the present invention is to provide an electromagnetic relay of the above described type in which the material for movable contact pieces employed therein may be selected from a wide range of materials, and contact fusion does not readily take place, while the relay compact and thin in size has a small power consumption.
  • a further object of the present invention is to provide an electromagnetic relay of the above described type which is simple in construction and stable in functioning, and can be readily manufactured at low cost.
  • an electromagnetic relay which includes a base, fixed contact terminals having fixed contacts and movable contact terminals supporting intermediate portions of movable contact arms each provided, at opposite ends thereof, with movable contacts confronting said fixed contacts, with the fixed contact terminals and movable contact terminals being forced into the base to be fixed therein, an electromagnet block in which a coil is wound, through a spool, onto a core generally in an inverted U-shape provided with a permanent magnet at its central portion, and an armature block at­tracted and pivotally held by the permanent magnet so that opposite ends of said armature block confront pole face of said core.
  • the electromagnet block is assembled above the movable contact arms, thereby to allow the contacts to be closed through depression of said movable contact arms by the armature block.
  • the positional relation between the fixed contacts and movable contacts is determined based on the base, and is not affected by the assembling accuracy during mounting of the electromagnet block onto the base.
  • the positional relation between the pole portions thereof and the pole faces of the core of the electromagnet block depends only on the assembling accuracy of the armature block onto the electromagnet block.
  • an electromagnetic relay which includes a base, movable contact terminals fixed to said base, movable contact arms each having movable contacts at its opposite ends and welded, at its central portion, to said movable contact terminals so as to be supported, fixed contact terminals each having fixed contacts contacting under pressure from above, said movable contacts of said movable contact arms and forced into said base so as to be fixed, an electromagnet block in which a coil is wound, through a spool, onto a core generally in an inverted U-shape provided with a permanent magnet at its central portion, and an armature block attracted and pivotally held by the permanent magnet so that opposite ends of said armature block confront pole face of said core.
  • the electromagnet block is assem­bled onto the base so as to be located above said movable contact arms, thereby to allow the contacts to be opened through depression of said movable contact arms by said armature block.
  • the positional relation between the fixed contacts and movable contacts is also determined based on the base, without being affected by the assembling accuracy during mounting of the electromagnet block onto the base.
  • the armature block is held by the permanent magnet of the electromagnet block, the positional relation between the pole portions thereof and the pole faces of the core of the electromagnet block depends only on the assembling accuracy of the armature block onto the electromagnet block.
  • an electromagnetic relay M1 according to a first embodiment of the present invention, which generally in­cludes a base 1, an armature block 3, an electromagnet block 4 and a casing 6.
  • the base 1 in a rectangular plate like configura­tion and made of an insulative synthetic resin has columns 10a, 10b, 10c and 10d extending upwardly from its four corners on the surface for supporting the electromagnet block 4, terminal inserting portions 11 for receiving movable contact terminals 22, provided to extend upwardly from the base 1 at opposite sides with respect to a central line in the longitudinal direction, and terminal engaging. portions 12 for engagement with forward ends of support pieces 23 of the movable contact terminals 22, provided at the central portion of said base.
  • two sets of fixed contact terminals 14a and 14b are integrally provided by insert molding, and upper ends of said fixed contact terminals 14a and 14b are bent in a horizontal direction so as to be exposed on the upper surface of the base 1.
  • fixed contacts 15a and 15b are provided, with the lower ends of said fixed contact terminals 14a and 14b extending downwardly from side faces of the base 1 as shown.
  • holes or bores 16 for coil terminals are formed, and in the upper faces of the columns 10b and 10d, holes 17 for receiving dummy terminals are formed.
  • holes 18 are formed to receive the set of the movable contact terminals 22 to which movable contact pieces 20 are secured.
  • the movable contact pieces 20 are electro-conductive members having resiliency, and respec­tively formed with movable contacts 21a and 21b on the under faces at the opposite ends thereof.
  • the upper ends of the movable contact terminals 22 are folded in a horizontal direction to confront each other so as to form support pieces 23, with stopper pieces 24 being formed in the vicinity of said support pieces 23, and the movable contact pieces 20 are each fixed, at central portions thereof, to said support pieces 23 by caulking or welding.
  • the movable contact terminals 22 are forced into the holes 18 of the inserting portions 11 from above, and assembled, with the stopper pieces 24 contacting the upper faces of the insert­ing portions 11, and with the forward ends of the support pieces engaged with the terminal engaging portions 12, and thus, as shown in Fig. 2, the movable contacts 21a and 21b confront the fixed contacts 15a and 15b through working spaces Sa and Sb.
  • the armature block 3 includes an armature 30 of a magnetic material in a rectangular configuration, and an insulating member 31 made of a synthetic resin and integral­ly formed at the central portion of said armature 30. At the central portion on the upper surface of the armature 30, a holding portion 32 having a semi-circular cross section and extending in a direction normal to the longitudinal direction is formed.
  • guide pin portions 33 are formed in positions close to the opposite ends of said holding portion 32, while on the under surface of the insulating member 31, in posi­tions spaced from the central portion by an equal distance in the longitudinal direction, depressing portions or protrusions 34a and 34b each extending in a direction normal to the longitudinal direction are provided.
  • This armature block 3 is pivotally supported about the contact point between the holding portion 32 and the permanent magnet 41 by causing the holding portion 32 thereof to be attracted from below, onto the permanent magnet 41 of the electromag­net block 4 to be mentioned later, with the guide pin portions 33 engaged in a bearing portion 51 of a spool 42. Furthermore, upon mounting the electromagnet block 4 onto the base 1, the depressing portions 34a and 34b of this armature block 3 are arranged to be pressed against the movable contact pieces 20 referred to earlier.
  • the electromagnet block 4 generally includes a core 40, the permanent magnet 41, the spool 42, a coil 43, coil terminals 44 and dummy or auxiliary terminals 45.
  • the core 40 made of a magnetic material has a generally U-shape, with opposite ends thereof bent downward­ly as shown in Fig. 2, and its under faces at the bet opposite end portions are formed into pole faces 46a and 46b.
  • the permanent magnet 41 is a rectangular parallelopiped member magnetized with N pole at the lower portion, and S pole at the upper portion, and attracted to the central portion of said core 40 as shown in Fig. 2.
  • the spool 42 is integrally formed with the core 40 and the permanent magnet 41 by the insert molding so as to cover said core and permanent magnet, and is provided with flange portions 47a, 47b and 48 at its opposite ends and central portion.
  • the pole faces 46a and 46b of the core 40 are exposed, while, at the upper corner portions thereof, recesses 49 are formed, and espe­cially, at the upper surfaces of the flange portion 47a, coil drawing out grooves 50 communicated with the recesses 49 are formed.
  • the N pole of the permanent magnet 41 is exposed as shown in Fig. 3, with the bearing portion 51 having a semi-circular cross section being formed at the opposite sides of said permanent magnet 41.
  • the coil 43 is wound around the portions of the spool 42 between the flange portions 47a and 47b at the opposite ends and the flange portion 48 at the central portion, and both ends of the coil 43 are led into the recesses 49 through the coil drawing out grooves 50 referred to earlier so as to be wound around coil winding portions 52 of the coil terminals 44 to be mentioned below.
  • the coil terminals 44 are forced into the under surface of the flange portion 47a at the left side of the spool 42 as shown in Fig. 1, and the upper ends of said coil terminals 44 project into the recesses 49 to provide the coil winding portions 52 referred to above.
  • the dummy terminals 45 are also forced into the under surface of the flange portion 47b at the right side of the spool 42 in Fig. 1, with the upper ends thereof extend­ing upwardly into the recesses 49. These dummy terminals 45 are intended to fix the electromagnet block 4 by inserting the lower ends thereof into the dummy terminal receiving holes 17 formed on the base 1.
  • the casing 6 in he rectangular box-like configura­tion is fitted over the base 1 onto which the electromagnet block 4 is applied, and is sealed by a sealing material 7 as shown in Fig. 2.
  • the coil terminals 44 are forced into the spool 42 integrally formed with the core 40 and the permanent magnet 41 preliminarily by the insert molding, and the coil 43 is wound onto the spool 42, with the opposite ends of said coil 43 being wound onto the winding portions 52 of the coil terminals 44, and thus, the electromagnet block 4 is formed.
  • the armature block 3 is held on the under surface of the permanent magnet 41, with the holding portion 32 of the armature block 3 attracted by the permanent magnet 41, and with the guide pin portions 33 engaged with the bearing portion 51, whereby the armature block 3 is pivotally supported for pivotal movement about the contact point of the holding portion 32 and the perma­nent magnet 41, while being restricted for the movement in a horizontal direction through engagement between the guide pin portions 33 and the bearing portion 51.
  • Pole portions 30a and 30b at the opposite ends of the armature 30 are magnetized with the magnetic polarity at the lower end of the permanent magnet 41, i.e.
  • the movable contact terminals 22 to which the movable contact pieces 20 are secured are forced into the movable contact terminal receiving holes 18 of the inserting portions 11 of the base 1 integrally formed with the fixed contact terminals 14a and 14b by the insert molding, until the stopper pieces 24 of the movable contact terminals 22 contact the upper surface of the inserting portions 11 and the forward ends of the support pieces 23 engage the terminal engaging portions 12, whereby working spaces Sa and Sb are formed between the movable contacts 21a and 21b and the fixed contacts 15a and 15b.
  • the armature block 3 since the armature block 3 is in an inclined state, and one of the pole portions, for example, the pole portion 30a is attract­ed onto the pole face 46a of the core 40, with the depress­ing portion 34b depressing the movable contact piece 20, and with the other depressing portion 34a being retreated upwardly from said movable contact piece 20, the movable contacts 21b contact the fixed contacts 15b under pressure, while the movable contacts 21a are spaced from the fixed contacts 15a for opening.
  • the casing 6 is fitted onto the base 1 in such a manner as said casing is applied onto the electromagnet 4, and the sealing agent 7 is applied between the casing 6 and the base 1 for sealing as shown in Fig. 2.
  • the fixed contact terminals 14a and 14b, and the movable contact terminals 22 to which the movable contact pieces 20 are fixed are directly assembled onto the base 1.
  • the fixed contact terminals 14a and 14b are integrally formed with the base 1 by the insert molding, the positional relation of the fixed contacts 15a and 15b may be determined at high accuracy.
  • the positions of the movable contacts 21a and 21b are mainly affected by the fixing positions of the movable contact pieces 20 onto the movable contact terminals 22 and the positions of the holes 18 for inserting the movable contact terminals 22 into the base 1, since such fixing of the movable contact pieces 20 onto the movable contact terminals 22 are accurately effected at the stage of part processing and the holes 18 are preliminarily formed during molding of the base 1, the positional relation of the movable contacts 21a and 21b can be determined at high accuracy.
  • the positional relation between the fixed contacts 15a and 15b and the movable contacts 21a and 21b may be determined on the basis of the base 1, and is not affected by the accuracy for mounting the electromagnet block 4 onto the base 1. Furthermore, the positional relation between the pole faces 46a and 46b of the core 40, and the pole portions 30a and 30b of the armature 30 can be determined based on the spool 42 of the electromagnet block 4, and is not influenced by the assem­bling accuracy of the electromagnet onto the base 1.
  • the contact mechanism is provided below the electro­magnet block 4 within a projection area thereof, floor area may be reduced, different from the conventional construction in which the contact mechanism is provided at opposite sides of the electromagnet block, whereby the mounting area with respect to he printed circuit board becomes smaller, with a consequent increase of the mounting density.
  • the movable contact pieces 20 are fixed to the movable contact terminals 22 which are forced into the base 1 for securing, the movable contact pieces 20 are rigidly supported for stable functioning, different from the conventional con­struction in which movable contact pieces are connected to the movable contact terminals through the T-shaped connector pieces.
  • the arrangement of the present invention is different from the conventional construction in which the armature and movable contact pieces are formed into one unit, while the pivotal movement of the armature block is obstructed by the twisting rigidity of the T-shaped connec­tor pieces, and the pivotal movement in a see-saw fashion may be effected only by the armature 30 for stabilization of the functioning characteristics.
  • the contact mechanism is disposed below the electromagnet block 4, such electromagnet block may be increased in its size without being restricted by the contact mechanism to achieve a higher sensitivity of the coil.
  • the electromagnet block 4 is supported on the base 1 by the four colums 10a to 10d, the adjustment of the contact mechanism disposed thereunder may be readily effected through spaces defined between said columns.
  • the armature block 3 When the electromagnet block 4 is in a de-ener­gized state, with no current being fed to the coil 43 through the coil terminals 44, the armature block 3 has, for example, its left side pole portion 30a of the armature 30, attracted to the pole face 46a of the core 40, and is maintained in an inclined state as it rotates clockwise in Fig. 2.
  • the depressing portion or protrusion 34b of the armature block 3 depresses the movable contact piece 20 downwards, and the depressing portion 34a retreats upwards from the movable contact piece 20, while the movable con­tacts 21b contact the fixed contacts 15b under pressure, with the movable contacts 21a being in a state spaced from the fixed contacts 15a.
  • the armature block 3 Upon feeding current into the coil 43 for energization of the electromagnet block 4 so that the pole face 46a of the core 40 becomes N pole, and the pole face 46b thereof assumes S pole, the armature block 3 effects the pivotal movement in the counterclockwise direction in Fig. 2 based on the magnetic attraction between the right side pole portion 30b of the armature 30 and the pole face 46b of the core 40, whereby the depressing portion 34a depresses the movable contact piece 20 downwards, with the depressing portion 34b retreating upwards from the movable contact piece 20, and thus, the movable contacts 21a are closed to the fixed contacts 15a, while the movable contacts 21b are spaced from the fixed contacts 15b.
  • the armature block 3 effects pivotal movement in the clockwise direction in Fig. 2, based on the magnetic attrac­tion between the left side pole portion 30a of the armature 30 and the pole face 46a of the core 40, and thus, the movable contacts 21a are spaced from the fixed contacts 15a, and the movable contacts 21b are closed on the fixed con­tacts 15b.
  • an electromagnetic relay M2 according to a second embodiment of the present invention, which also includes a base 101, an armature block 103, an electromagnet block 104 and a casing 106 in the similar manner as in the fist embodiment of Figs. 1 to 3.
  • the base 101 also having a rectangular plate-like shape and made of an insulative synthetic material has an insulating wall 110 extending along the center axis in a longitudinal direction thereof, and columns 111a, 111b, 111c, and 111d extending upwardly from its four corners for supporting the electromagnet block 104.
  • movable contact terminals 113 are integrally formed by the insert molding, and the upper ends of said movable contact terminals 113 are folded in a horizontal direction to be exposed over the upper surfaces of the projecting portions 112, while the lower ends of said terminals 113 extend downwardly from the side portions of the base 101.
  • holes 114 for receiving coil terminals are formed, and in the upper faces of the columns 111b and 111d, holes 115 for receiving dummy terminals are provided, while, at base portions of the respective columns 111a, 111b, 111c and 111d, holes 116a and 116b for receiving fixed contact terminals are formed.
  • the upper portions of the projecting portions 112 are further extended upwardly to form bearing portions 117 in which guide pin portions 133 of the armature block 103 are engaged.
  • movable contact pieces 118 are each welded at its central portion to be supported thereat.
  • Each of said movable contact pieces 118 is made of a resilient electrically conductive material, and formed, on the upper face at its opposite ends, with movable contacts 119a and 119b.
  • two sets of fixed contact terminals 120a and 120b are forced into the holes 116a and 116b for said fixed contact terminals.
  • the upper ends of the fixed contact terminals 120a and 120b are bent in a horizontal direction, with fixed contacts 121a and 121b are provided at reverse faces there­of, and said fixed contacts 121a and 121b are held in contact with the movable contacts 119a and 119b of the movable contact pieces 118 under a predetermined contact pressure, with the lower ends of said terminals extending downwardly from the bottom face of said base 1.
  • the armature block 103 has the construction generally similar to that in the first embodiment of Figs. 1 to 3, and includes an armature 130 of a magnetic material in a rectangular configuration, and an insulating member 131 made of a synthetic resin and integrally formed at the central portion of said armature 130. At the central portion on the upper surface of the armature 130, a holding portion 132 having a semi-circular cross section and extend­ing a direction normal to the longitudinal direction is formed.
  • the guide pin portions 133 are formed in positions close to the opposite ends of said holding portion 132, while on the under surface of the insulating member 131, in positions spaced from the central portion by an equal distance in the longitudinal direction, depressing portions or protrusions 134a and 134b each extending in a direction normal to the longitudinal direction are provided.
  • This armature block 103 is pivotally supported about the contact point between the holding portion 132 and the permanent magnet 141 by causing the holding portion 132 thereof to be attracted from below, onto the permanent magnet 141 of the electromagnet block 104, with the guide pin portions 133 engaged in a bearing portion 150 of a spool 142. Furthermore, upon mounting the electromagnet block 104 onto the base 101, the depressing portions 134a and 134b of this armature block 103 are arranged to be pressed against the movable contact pieces 118 as referred to earlier.
  • the electromagnet block 104 generally includes a core 140, the permanent magnet 141, the spool 142, a coil 143, coil terminals 144 and dummy terminals 145.
  • the core 140 made of a magnetic material has a generally U-shape, with opposite ends thereof bent downward­ly as shown in Fig. 5, and its under faces at the bent opposite end portions are formed into pole faces 146a and 146b.
  • the permanent magnet 141 is a rectangular parallelopiped member magnetized with N pole at the lower portion, and S pole at the upper portion, and attracted to the central portion of said core 140 as shown in Fig. 5.
  • the spool 142 is integrally formed with the core 140 and the permanent magnet 141 by the insert molding so as to cover said core and permanent magnet, and is provided with flange portions 147a, 147b and 148 at its opposite ends and central portion.
  • the pole faces 146a and 146b of the core 140 are exposed, while, at the upper corner portions thereof, especially, at the upper surface of the flange portion 147a, a coil drawing out groove 149 is formed.
  • the N pole of the permanent magnet 141 is exposed as shown in Fig. 6, with the bearing portion 150 having a semi-circular cross section being formed at the opposite sides of said permanent magnet 141.
  • the coil 143 is wound around the portions of the spool 142 between the flange portions 147a and 147b at the opposite ends and the flange portion 148 at the central portion, and both ends of the coil 143 are led through the groove 149 so as to be wound around coil winding portions 152 of the coil terminals 144 to be mentioned below.
  • the coil terminals 144 are forced into the under surface of the flange portion 147a at the left side of the spool 142 as shown in Fig. 4, and the upper ends of said coil terminals 144 project to provide the coil winding portions 152.
  • the dummy terminals 145 are also forced into the under surface of the flange portions 147b at the right side of the spool 142 in Fig. 4. These dummy terminals 145 are intended to fix the electromagnet block 104 by inserting the lower ends thereof into the dummy terminal receiving holes 117 formed on the base 101.
  • the casing 106 in the rectangular box-like config­uration is fitted over the base 101 onto which the electro­magnet block 104 is applied, and is sealed by a sealing material 107 as shown in Fig. 5.
  • the coil terminals 144 are forced into the spool 142 integrally formed with the core 140 and the permanent magnet 141 preliminarily by the insert molding, and the coil 143 is wound onto the spool 142, with the opposite ends of said coil 143 being wound onto the winding portions 152 of the coil terminals 144, and thus, the electromagnet block 104 is formed.
  • the armature block 103 is held on the under surface of the permanent magnet 141, with the holding portion 132 of the armature block 103 attracted by the permanent magnet 141, and with the guide pin portions 133 engaged with the bearing portion 150, whereby the armature block 103 is pivotally supported for pivotal movement about the contact point of the holding portion 132 and the permanent magnet 141, while being restricted for the movement in a horizontal direction through engagement between the guide pin portions 133 and the bearing portion 150.
  • the pole portions 130a and 130b at the opposite ends of the armature block 130 are magnetized with the magnetic polarity at the lower end of the permanent magnet 141, i.e.
  • the fixed contact terminals 120a and 120b are forced into the receiv­ing holes 116a and 116b in such a manner that the fixed contacts 121a and 121b thereof are brought into contact with the movable contacts 119a and 119b from above, whereby the movable contact pieces 118 are deflected and the movable contacts 119a and 119b and the fixed contacts 121a and 121b contact each other at a predetermined contact pressure. Accordingly, at the above assembling state, i.e. at the time point for assembling the contact mechanism onto the base 101, adjustments of the contact pressure may be effected by adjusting the inserting pressure of the fixed contact termi­nals 120a and 120b.
  • the depressing portions 134a and 134b of the armature block 103 depress the movable contact pieces 120.
  • the armature block 103 is in an inclined state, and one of the pole portions, for example, the pole portions 130a is attracted onto the pole face 146a of the core 140, with the depressing portion 134b depressing the movable contact piece 118, and with the other depressing portion 134a being retreated upwardly from said movable contact piece 118, the movable contacts 119a contact the fixed contacts 121a under pressure, while the movable contacts 119b are spaced from the fixed contacts 121b for opening.
  • the casing 106 is fitted onto the base 101 in such a manner as said casing is applied onto the electromagnet 104, and the sealing magnet 107 is applied between the casing 106 and the base 101 for sealing as shown in Fig. 5.
  • the fixed contact terminals 120a and 120b, and the movable contact pieces 118 are directly assembled onto the base 101.
  • the movable contact pieces 118 are welded to the movable contact terminals 113, since the movable contact terminals 113 are integrally formed with the base 101 by the insert molding and welding to the terminals 113 may be effected accurately as compared with pressure insertion, etc., the positional relation of the movable contacts 119a and 119b may be determined at high accuracy.
  • the positions of the fixed contacts 121a and 121b are mainly affected by the positions of the insert­ing holes 116a and 116b for inserting the fixed contact terminals 120a and 120b into the base 101, since the holes 116a and 116b are preliminarily formed during molding of the base 101, the positional relation of the fixed contacts 121a and 121b can be determined at high accuracy.
  • the core 140 of the electromagnet block 104 and the permanent magnet 141 are integrally molded with he spool 142 by the insert molding, positional rela­tions thereof may also be determined at high accuracy.
  • the position of the bearing portion 150 for restricting the displacement thereof in a horizontal direction, and the mounting accuracy of said block 103 onto the electromagnet block 104 since the bearing portion 150 is preliminarily formed during molding of the spool 142, with the assembling thereof being effected at relatively high accuracy through engagement between the guide pin portion 133 and the bearing portion 150, the positional relation between the pole faces 146a and 146b of the core 140, and the pole portions 130a and 130b at the opposite ends of the armature 130 can be determined at high accuracy.
  • the positional relation between the fixed contacts 121a and 121b and the movable contacts 119a and 119b may be determined on the basis of the base 101, ad is not affected by the accuracy for mounting the electromagnet block 104 onto the base 101.
  • the positional relation between the pole faces 146a and 146b of the core 140, and the pole portions 130a and 130b of the armature 130 can be determined based on the spool 142 of the electromagnet block 104, and is not influenced by the assembling accuracy of the electromagnet 104 onto the base 101.
  • the armature block 103 When the electromagnet block 104 is in a de-ener­gized state, with no current being fed to the coil 143 through the coil terminals 144, the armature block 103 has, for example, its left side pole portion 130a of the armature 130, attracted to the pole face 146a of the core 140, and is maintained in an inclined state as it rotates clockwise in Fig. 5.
  • the depressing portion 134b of the armature block 103 depresses the movable contact piece 180 downwards, and the depressing portion 134a retreats upwards from the movable contact piece 180, while the movable contacts 119a contact the fixed contacts 21a under pressure, with the movable contacts 19b being in a state spaced from the fixed contacts 21b.
  • the armature block 103 Upon feeding current into the coil 143 for energization of the electromagnet block 104 so that the pole face 146a of the core 140 becomes N pole, and the pole face 46b thereof assumes S pole, the armature block 103 effects the pivotal movement in the counterclockwise direction in Fig.
  • the armature block 103 effects pivotal movement in the clockwise direction in Fig. 5, based on the magnetic attraction between the left side pole portion 130a of the armature 130 and the pole face 146a of the core 140, and thus, the movable contacts 119a are closed to the fixed contacts 121a, and the movable contacts 119b are spaced from the fixed contacts 121b.
  • the movable contacts 119a and 119b are spaced from the fixed contacts 121a and 121b through depression of the movable contact pieces 118 by the depressing portions 134a and 134b of the armature block 103, even when welding at the contacts should take place, the contacts may be readily separated by the depressing force of the depressing portions 134a and 134b of the armature block 103.
  • the positional relations for the principal parts are deter­mined on the basis of the base, without any accumulation of errors during assembling of parts, and therefore, high dimensional accuracy may be achieved similarly.
  • scattering in accuracy is not present among finished prod­ucts to maintain uniform quality for stable functioning characteristics, and thus, adjusting work may be facilitated for reduction of man-hour required for the adjustments.
  • an electromagnetic relay M3 according to a third embodiment of the present invention, which generally includes a base 201, two sets of movable terminal members 202, four sets of fixed terminal members 203, a movable member 204, an electromagnet block 205, and a casing 206.
  • the base 201 also in a rectangular plate-like configuration and made of an insulative synthetic resin has stands or columns 211 extending upwardly from the four corners on the upper surface of a base main body 210, while each of the columns 211 is formed with a terminal inserting hole 212 extending from its upper face to lower face.
  • On the base 201 between the columns 211 along the longitudinal direction (i.e. in the direction indicated by arrows Y-Y′), support portions 213 formed with recesses 214 for receiving shaft portions 242 of the movable member 204 therein are respectively provided, while between the columns 211 and the support portions 213 in the direction of short sides (i.e. in the direction of arrows X-X′), partition walls 215a and 215b are respectively provided, with accommodating portions 216 being formed at both sides of said partition walls 215a and 215b.
  • terminal inserting bores or holes 217 at the base portions of the support portions 213, another sets of terminal inserting holes 218 between the columns 211 and the support portions 213, and recesses 219 at the base portions of the columns 211, while said terminal inserting holes 218 are communicated with said recesses 219 by grooves 219a.
  • the movable terminal members 202 are constituted by movable contact pieces 220 and common terminals 222.
  • Each of the movable contact pieces 220 is made of a thin electrically conductive plate material, with movable con­tacts 221 being provided at opposite end upper faces.
  • each of the common terminals 222 is folded at right angles at its upper portions to form a connecting portion 223, to which the movable contact piece 220 is welded at its central portion for electrical connection.
  • the movable contact pieces 220 of the movable terminal members 202 are respectively received in the accommodating portions 216 by forcing the common terminals 222 thereof into the inserting holes 217 of the base main body 210 so as to cause the lower ends thereof extended through the under surface for fixing.
  • Each of the fixed terminal members 203 is consti­tuted by forming an arm portion 232 through extension of the upper portion of the terminal portion 231 laterally, and providing a contact base 233 by folding the upper portion of said arm portion 232 in the horizontal direction, with the lower end thereof being formed into a leg portion 235. There are also formed a fixed contact 234 on the under surface of said contact base 233, and an engaging projection 231a at the upper portion of the terminal portion 231.
  • the fixed terminal members 203 When the fixed terminal members 203 are fixed by inserting the terminal portions 231 thereof into the holes 218 provided at the base portions of the columns 211, and the leg portions 231 into the recesses 219, with the arm portions 232 fitted into the groove portions 219a, the fixed contacts 234 contact the movable contacts 221 under pres­sure, so as to cause the movable contact arms 220 to be curved into an arcuate shape.
  • the fixed terminal members 203 and the movable contact pieces 220 are connected to each other through a contact detecting device 281, which is connected to a central processing unit CPU which controls this system in a concentrated manner, while a position detecting device 283 of a jig (shown by an arrow in Fig. 10 for convenience of description) of a pressure inserting device 232 is connected to said central processing unit CPU.
  • the central processing unit CPU produces a driving signal for driving said pressure inserting device 282 by receiving signals from said contact detecting device 281 and said position detecting device 283.
  • the central processing unit CPU applies the driving signal to the pressure insert­ing device 282, which forces the fixed terminal members 203 into the base 201 based on said signal, and the contact detecting device 281 detects the amount inserted under pressure so as to apply a detecting signal to the central processing unit CPU.
  • the contact detecting device 281 which detects this state applies the detecting signal to the central processing unit CPU, and based on said signal, the central processing unit CPU counts the detecting signal from the position detecting device 283.
  • the central processing unit CPU stops the driving signal to the pressure inserting device 282, and thus, the adjustment of the contact pressure is completed.
  • a predetermined contact pressure may be achieved if the fixed contact terminal members 203 are inserted under pressure by the predetermined amount.
  • the amount by the pressure insertion of the fixed terminal members 203 may be automatically subjected to fine adjust­ment by the pressure inserting device 282, there is an advantage that the contact pressure may be automatically adjusted.
  • the movable member 204 is made of a rectangular plate 241 of a magnetic material provided with the shaft portions 242 extending outwardly from the central side portions thereof. Between the shaft portions 242, a central shaft portion 243 is provided by an ejecting process, while in positions confronting each other, with the central shaft portion 243 held therebetween, insulating portions 244 are integrally formed by an outsert molding, with protrusions 245 being respectively formed on the under surface of the insulating portions 244.
  • the movable member 204 described above is pivotal­ly supported through engagement of said shaft portions 242 with the recesses 214 of the support portions 213 on the base 201, and is arranged to depress the upper faces of the movable contact pieces 220 by the protrusions 245 thereof so as to deflect said contact pieces 220 in the arcuate shape (Fig. 8).
  • the electromagnet block 205 includes an iron core 251 formed by outwardly bending magnetic poles at opposite ends of a magnetic member having generally a U-shaped cross section, and a magnet 252 disposed at the central under surface of said iron core 251, which are subjected to an insert molding with a spool 253 made of an insulative resin.
  • the under surfaces of the magnet poles at the opposite ends of the iron core 251 may be exposed from the spool 253, or covered by the spool to a slight extent to provide a magnetic shielding effect.
  • the spool 253 includes flange portions 254 and 255 located at the opposite end magnetic pole portions of the iron core 251, and another flange portion 256 provided therebetween to hold a permanent magnet 252.
  • Coil terminals 257 are attached to the flange portion 254 at one side in a state projecting upwardly and downwardly, while auxiliary terminals 258 are also attached to the flange portion 255 at the other end in a state also projecting upwardly and downwardly.
  • a coil 259 is continuously wound, with lead wires thereof being electrically connected to the upper projecting portions of the coil terminals 257 referred to earlier.
  • engaging projections 257a and 258a There are also provided engaging projections 257a and 258a.
  • the electromagnet block 205 has a magnetic pole portion 252a of the permanent magnet 252 thereof pressed against the central shaft portion 243 of the movable member 204 by inserting the coil terminals 257 and the auxiliary terminals 258 into the inserting holes 212 of the columns 211 on the base main body 210 for fixing.
  • the casing 206 has a rectangular box-like configu­ration capable of outwardly applying onto the base 201 provided with the electromagnet block 205, etc., and a junction between the casing 206 and the base 201 is sealed by filling a bonding agent 262 in a recess provided along the under surface outer edge of the base 201 for solidifica­tion.
  • a bonding agent 262 in a recess provided along the under surface outer edge of the base 201 for solidifica­tion.
  • the electromagnetic relay M3 having the con­struction as described above, for example, if the upper portion of the permanent magnet 242 is magnetized as N pole, and the lower portion thereof as S pole, a magnetic field is formed in a direction indicated by arrows (Fig. 8).
  • the left side of the movable contact piece 220 urged by the protrusions 245 is further biased downwardly in Fig. 8, and the distance between the fixed contacts 234 and the movable contacts 221 located at the left side is increased, while as the protrusion 245 is displaced, the movable contacts 221 located at the right side contact the fixed contacts 234. Therefore, the fixed terminal members 203 at the right side are electrically connected to the movable terminal members 222, with the state being maintained even when the electric current is stopped.
  • the movable member 204 is rotated in the direction indicated by an arrow B, whereby the fixed contacts 234 and the movable contacts 221 at the right side in Fig. 8 are spaced from each other, while the fixed contacts 234 and the movable contacts 221 at the left side contact each other so that the fixed terminal members 203 and the movable terminal members 222 are electrically connected to each other, thereby returning to the original state.
  • Figs. 11 to 14 shows an electromagnetic relay M4 according to a fourth embodiment of the present invention.
  • the electromagnetic relay M4 similarly includes a base 301, two sets of movable terminal members 302, four sets of fixed terminal members 303, a movable member 304, an electromagnet block 305, and a casing 306.
  • the base 301 also in a rectangular plate-like configuration and made of an insulative synthetic resin has columns 311 extending upwardly from four corners on the upper surface of a base main body 310, while each of the columns 311 is formed with a terminal inserting bore 312 extending from its upper face to lower face.
  • On the base 301 between the columns 311 along the longitudinal direc­tion (i.e. in the direction indicated by arrows Y-Y′), support portions 313 with the recesses 314 are respectively provided, while, between the columns 311 and the support portions 313 along the direction of the short sides (i.e. in the direction of arrows X-X′), partition walls 315a and 315b are respectively provided, with accommodating portions 316 being formed at both sides of said partition walls 315a and 315b.
  • terminal inserting holes 317 at the base portions of the support portions 313, another sets of terminal inserting holes 318 between the columns 311 and the support portions 313, and recesses 319 at the base portions of the columns 311,while said terminal inserting holes 318 are communicated with said recesses 319 by grooves 319a.
  • the movable terminal members 302 are constituted by movable contact pieces 320 and terminals 322.
  • Each of the movable contact pieces 320 is made of a thin electrical­ly conductive plate material, with movable contacts 321 being provided at opposite end upper faces.
  • each of the terminals 322 is folded at right angles at its upper portion to form a connecting portion 323, to which the movable contact pieces 320 are fixed each in an asymmetrical relation at the left and right sides, with one side being formed into a first movable contact piece 320a and the other side into a second movable contact piece 320b (Figs. 13 and 14).
  • the movable terminal members 302 each have the terminals 322 thereof extended onto the under surface of the base 301, with the first and second movable contact pieces 320a and 320b being respectively accommodated into accommo­dating portions 316.
  • Each of the fixed terminal members 303 is consti­tuted by forming an arm portion 332 through extension of the upper portion of the terminal portion 331 laterally, and providing a contact base 333 by folding the upper portion of said arm portion 332 in the horizontal direction, with the lower end thereof being formed into a leg portion 335. There are also formed fixed contacts 334 on the under surface of said contact base 333.
  • the fixed terminal members 303 When the fixed terminal members 303 are fixed by inserting the terminal portions 331 thereof into the holes 318 provided at the base portions of the columns 311, and the leg portions 335 into the recesses 319, with the arm portions 332 fitted into the groove portions 319a, the fixed contacts 334 confront the movable contacts 321.
  • the movable member 304 is made of a rectangular plate 341 of a magnetic material provided with shaft por­tions 342 extending outwardly from the central side portions thereof. Between the shaft portions 342, a protruding fulcrum portion 343 is provided by a press work from below, while in positions confronting each other, with the fulcrum portion 343 held therebetween, insulating portions 344 are integrally formed, with first and second protrusions or depressing portions 345 and 346 being respectively formed on the under surface of the insulating portions 344 in a asymmetrical relation with respect to said fulcrum portion 343.
  • a distance from the fulcrum portion 343 to the first protrusion 345 is represented by l1
  • a distance to the second protrusion 346 therefrom is denoted by l2
  • a reaction force of the first movable contact piece 320a by the depression of the respec­tive protrusions 345 and 346 is shown by F1
  • a reaction force of the second movable contact piece 320b thereby is represented by F2.
  • the movable member 304 described above is pivotal­ly supported through engagement of said shaft portions 342 with recesses 314 of the support portions 313 on the base 301, and is arranged to depress the upper faces of the first and second movable contact pieces 320a and 320b by the first and second protrusions 345 and 346 so as to deflect the upper faces of said contact pieces 320a and 320b in the arcuate shape.
  • the electromagnet block 305 includes an iron core 351 formed by outwardly bending magnetic poles at opposite ends of a magnetic member having generally a U-shaped cross section, a magnet 352 disposed at the central under surface of said iron core 351, and a spool 353 made of an insulative resin and integrally mounted thereon in the similar manner as in the third embodiment.
  • the under surfaces of the magnet poles at the opposite ends of the iron core 351 may be exposed from the spool 353, or covered by the spool to a slight extend to provide a magnetic shielding effect.
  • the spool 353 includes flange portions 354 and 355 located at the opposite end magnetic pole portions of the iron core 351, and another flange portion 356 provided therebetween to hold a permanent magnet 352.
  • Coil terminals 357 are attached to the flange portion 354 at one side in a state projecting upwardly and downwardly, while auxiliary terminals 358 are also attached to the flange portion 355 at the other end in a state also projecting upwardly and downwardly.
  • a coil 359 is continuously wound, with lead wires thereof being electrically connected to the upper projecting portions of the coil terminals 357 referred to earlier.
  • the electromagnet block 305 has the under surface of the permanent magnet 352 thereof pressed against the fulcrum portion 343 of the movable member 304 by insert­ing the coil terminals 357 and the auxiliary terminals 358 into the inserting bores 312 of the columns 311 on the base main body 310 for fixing.
  • the casing 305 has a rectangular box-like configu­ration capable of outwardly applying onto the base 301 provided with the electromagnet 305, etc., and a junction between the casing 306 and the base 301 is sealed by filling a bonding agent 371 in a recess provided along the under surface outer edge of the base 301 for solidification.
  • a hole 361 formed on casing 306 for closing the assembling work is completed in the similar manner as in the electromagnetic relay M3 in the third embodiment.
  • the relay may be used as the self-retaining type or self-restoring type according to the direction of mounting the movable member 304.
  • the first movable piece 320a is urged downwardly by the first protru­sion 345, and the distance between the fixed contacts 334 and the movable contacts 321 is increased, while as the second protrusion 346 is upwardly displaced, the second movable contact piece 320b is moved, and the movable con­tacts 321 are brought into contact with the fixed contacts 334. Therefore, the fixed terminal members 303 at the right side are electrically connected to the movable terminal members 302.
  • the first movable contact piece 320a urged by the first protrusion 345 is further biased down­wardly, and the distance between the fixed contacts 334 and the movable contacts 321 is increased, while as the second protrusion 346 is upwardly displaced, the movable contacts 321 contact the fixed contacts 334. Therefore, the fixed terminal members 303 at the right side are electrically connected to the movable terminal members 302.
  • the movable member 304 is rotated in the direction indicated by the arrow B, whereby the fixed contacts 334 and the movable contacts 321 as the right side are spaced from each other, while the fixed contacts 334 and the movable contacts 321 at the left side contact each other so that the fixed terminal members 303 and the movable terminal members 302 are electrically connected to each other.
  • electromagnetic relays of self-holding type and self-restoring type can be readily provided by merely changing the attaching direction of the movable member.
  • the movable member can be constituted by the same part, the electromagnetic relays of the both type may be obtained without necessity for provid­ing new processing steps (or facilities) as in the conven­tional arrangements.
  • FIGs. 15 to 18 there is shown in Figs. 15 and 16, an electromagnetic relay M5 according to a fifth embodiment of the present invention.
  • the relay M5 in this embodiment is approximately similar to the relay M4 of the fourth embodiment, and the main difference therebetween resides in that in the third embodiment, the contact pres­sure is adjusted by adjusting the amount of pressure inser­tion of the fixed contact terminal members, while in the present embodiment, the contact pressure is adjusted by adjusting the amount of pressure insertion of the electro­magnet block.
  • the base 401 has a fundamental construction generally similar to that in the third embodi­ment, and fixed terminal members 403 are formed by insert molding between the columns 411 facing the short side direction (i.e. X-X′ direction), while fixed contacts 434 are respectively provided on contact bases 433 exposed upwardly. Moreover, with the intermediate point between support portions 413 provided on long side edges of the base 401 being set as a center point 01, at positions of point symmetry about the center point 01, connecting portions 423 of terminals 422 molded in the base 401 are respectively exposed.
  • a movable terminal member 402 which is constituted by the terminals 422 and a contact piece block 426 shown in Figs. 17 and 18, and this contact piece block 426 is formed by subjecting a pair of movable contact pieces 420 arranged in parallel to insert molding at central portions thereof by a block main body 424 of a synthetic resin material, with a pair of caulking projec­tions 424a being provided on the upper surface of said block main body 424.
  • the set of movable contact pieces 420 referred to above are plates of the same planner configura­tion produced by punching on electrically conductive thin plate, and each of the contact pieces 420 is divided into two parts at its opposite end portions so as to respectively provide movable contacts 421 on the under faces at the opposite ends, while hinge spring portions 426 having generally a J-shape in a flat plan are extended from the central portions of the long sides, with the connecting portions 425a at the free ends of said spring portions 425 being disposed at the positions of the point symmetry about the center point 01.
  • the movable member 404 of a flat plate-like configuration generally covering the contact piece block 426 has a shaft portion 446 at its central portion, and is formed with caulking holes 445a at opposed positions with respect to said shaft portion 446 held therebetween, and the central portion of said shaft portion 446 being set as a center axis portion 446b.
  • the movable member 404 may be replaced by another movable member prepared by punching a plate member from a magnetic material as in the third embodiment, and provided with a shaft portion consti­tuted by projections extended from the opposite sides, while an ejection processing is applied to the central portion to form the center axis portion.
  • the movable member 404 is formed into one unit with the contact piece 426 by fitting the caulking projec­tions 424a of the contact piece block 426 into the holes 446a thereof for subsequent caulking.
  • the processing for combining the contact piece block 426 with the movable member 404 is not limited to the caulking, but they may be combined into one unit, for example, by the insert molding to be effected two times.
  • the connecting portions 425a of the hinge spring portions 426 are not aligned on one side, but they are arranged in the point symmetry, there are such advantages that the spring force is not deviated to achieve favorable balancing, thereby facilitating the fine adjustment.
  • the electromagnet block 405 has an E-shaped cross section by attaching a permanent magnet 452 on an iron core 451 with a U-shaped cross section so as to be subjected to insert molding onto a spool 453. Since other construction is generally similar to that of the electromagnet block 305 described earlier with reference to the third embodiment, detailed description thereof is abbreviated here for brevity of explanation.
  • the central axis portion 446b of the movable member 404 is pivotally attracted and supported by the magnetic pole portion 452a of the permanent magnet 452, while the opposite ends of the movable member 404 confront the opposite end magnetic poles of the iron core 451 for selective contact and spacing.
  • positioning projections 457a (the positioning projection at the inner side is not shown) and 458a are respectively provided on the coil terminals 457 and auxilia­ry terminals 458, the electromagnet block 405 may be insert­ed under pressure and fixed at any desired position.
  • the movable member 404 and the contact piece block 426 are moved in the similar manner following the above displacement. Therefore, if the amount of pressure insertion of the electromagnet block 405 is adjusted by the automatic adjusting system described earlier, the distance between the movable contact 421 of the movable contact piece 420 and the fixed contact 434 may be adjusted in the similar manner as explained previously, thus making it possible to effect the automatic adjustment of the contact pressure.
  • the method of the adjustment is generally similar to that described with reference to the previous embodiment, and therefore, de­tailed description thereof is abbreviated here for brevity.
  • the casing 406 has a rectangular cubic box-like configuration which can be applied onto the base 401, and is formed with a gas discharging hole 461 at a corner on the top wall thereof.
  • the casing 406 is fitted onto the base 401 incor­porated with the contact piece block 426, movable member 404 and electromagnet block 405, etc. with a sealing agent 462 is applied onto the bottom face of the base 401 for solidi­fication and sealing, and thereafter, the gas inside the casing 406 is discharged from the gas discharging hole 461 for subsequent closing of said hole 461 by heat fusion, and thus, the assembly work of the relay is completed.
  • the left side end portion 404a of the movable iron piece 404 is attracted to the left side magnetic pole 451a of the iron core 451 to close a magnetic circuit by a magnetic flux ⁇ of the contacts 421b of the movable contact piece 420 are held in contact with the fixed contacts 434b, while the movable contacts 421a are spaced from the fixed contacts 434a.
  • the right side end portion 404b of the movable iron piece 404 is attracted to the right side magnetic pole 451b of the iron core 451, and therefore, the movable iron piece 404 is rotated about the center axis portion 446 as a fulcrum against the magnetic force of the permanent magnet 452, whereby the left side end portion 404a of the movable iron piece 404 is spaced from the left side magnetic pole 451a of the iron core 451, and then, the right side end portion 404b of the movable iron piece 404 is attracted onto the right side magnetic pole 451b of the iron core 451. Accordingly, after the movable contacts 421b are spaced from the fixed contacts 434b following rotation of the movable iron piece 404, the movable contacts 421a are brought into contact with the fixed contacts 434a.
  • the present embodiment is so arranged to open or close the contacts by directly driving the movable contact piece 420 through rotation of movable member 404, and the arrangement is different from that in the third embodiment in which the contacts are opened or closed by depressing the movable contact piece 320 by the protrusion 345 made of an insulat­ing material and provided on the movable member. Therefore, such protrusions become unnecessary, and thus, no inconve­niences take place due to variation of operating character­istics by abrasion of the protrusions or poor contacts arising from abraded powder of such protrusions, etc.
  • the electromagnetic relay M5 of the present embodiment since the desired contact pressure may be obtained by causing the movable contact piece 420 to deflect by a necessary minimum degree, spring load of the movable contact piece 420 is small as shown by a folded dotted line C in Fig. 23. Accordingly, owing to the fact that the contacts may be opened or closed by a small at­tracting force as shown by an attracting force dotted line D in Fig. 23, not only an electromagnetic relay of a high sensitivity can be obtained, but such a relay of a low electric consumption may also be presented.
  • the present invention since it is so arranged to open or close the contacts by directly driving the movable contact piece through rotation of the movable iron piece 404, without depressing the movable contact piece by the protrusion provided on the movable iron piece for opening or closing the contacts, such a protrusion or the like becomes unnecessary, and thus, no inconvenience due to abrasion of the protrusion takes place.
  • Another advantage available by the arrangement of the present invention is such that, since the movable contact piece 420 is applied with the urging force only when the contacts are close, the movable contact piece 420 is not readily fatigued, and therefore, the material for the movable contact piece 420 may be selected from a wide range of materials.
  • the present invention has been de­scribed with reference to the electromagnetic relay of the self-holding type, the concept of the present invention is not limited in its application to the relay of the self-­holding type alone, but may be readily applied to the relay of the self-restoring type as well.
  • the iron core having the U-shaped cross section described as employed in the electromagnet block for the above embodiment may, for example, be so modified as to improve magnetic efficiency by outwardly folding the magnetic pole portions at opposite ends of the iron core for increasing the attracting faces, or to be a self-restoring type through variation of a magnetic balance by outwardly folding only one of the magnetic pole portions.
  • the electromagnet block is adapted to be forced into the base, and at the magnetic pole portion of the permanent magnet constituting said magnetic block, the movable member is pivotally attracted and held, with the movable contact piece being integrally provided at the under face of said movable member at a predetermined interval through the insu­lating member. Therefore, as the electromagnet block is vertically moved, the movable contact provided on the under surface of the movable contact piece is also vertically shifted, and thus, the distanced with respect to the fixed contact exposed from the upper surface of the base is altered.
  • the distance between the contacts and consequently, the contact pressure may be adjusted by displacing the electromagnet block vertically, and thus, adjustment of the contact pressure for the electromagnetic relay may be facilitated.
  • the electromagnet relay since the amount of pressure insertion can be finely adjusted by an adjusting mechanism, the electromagnet relay may be made still more compact in size.
  • the contacts in order to obtain a desired contact pressure, since the contacts may be closed by causing said movable contact piece to be deflected by a minimum necessary amount, spring load for the movable contact piece may be reduced. Therefore, since the contacts may be opened or closed by a small attracting force, the electromagnetic relay not only highly sensitive, but low in power consumption may be obtained.
  • the movable contact piece is integrally provided at the under surface of the movable iron piece through the predetermined interval, the movable contact piece is driven following the pivotal movement of the movable iron piece. Therefore, the protruding portion as in the conventional arrangement becomes unnecessary, and the inconveniences such as variations of operating charac­teristics by the abrasion of the protruding portion or poor contact due to powder produced by abrasion do not take place.
  • the fixed contact terminals are embedded in the base, with only the fixed contacts being exposed from the upper surface of the base, while no protruding portion or the like is required to be provided on the movable iron piece, and therefore, the height of the arrangement by the accumulation of the constituting parts may be reduced to provide a thin electromagnetic relay.
  • the movable contact piece is applied with the urging force only at the closing of the contacts, the movable contact piece is subjected to less fatigue than in the conventional arrangement, and thus, the material of the movable contact can be selected from a wide range of materials.
  • the hinge spring portion of the movable contact piece is of a bent and substantially long shape, it is readily subjected to elastic deformation, requiring a small spring load. Therefore, no adverse effect is given to the pivotal function of the movable iron piece attracted and held by the magnetic pole portion of the permanent magnet, without deviation in the rotating point, not only a smooth open/close function is achieved, but the power consumption may be further saved.
  • the free ends of the hinge spring portions provided on the two movable contact pieces disposed in parallel are arranged to be in a point symmetry, without aligning at one side, no deviation is produced in the spring force of the hinge spring portion, thus, providing a favor­able balancing, and thus, find adjustment of operating characteristics is facilitated, without requiring much time and labor for the adjusting work.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Electromagnets (AREA)
EP19890115585 1988-08-25 1989-08-23 Relais électromagnétique Withdrawn EP0355817A3 (fr)

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
JP63212909A JP2687471B2 (ja) 1988-08-25 1988-08-25 電磁継電器
JP212909/88 1988-08-25
JP24025388A JPH0287434A (ja) 1988-09-26 1988-09-26 電磁継電器
JP240253/88 1988-09-26
JP109929/89 1989-04-28
JP10992989A JPH02288127A (ja) 1989-04-28 1989-04-28 電磁継電器
JP113229/89 1989-05-02
JP11322989A JPH02291626A (ja) 1989-05-02 1989-05-02 電磁継電器
JP11643189A JP2773236B2 (ja) 1989-05-10 1989-05-10 電磁継電器
JP116431/89 1989-05-10

Publications (2)

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EP0355817A2 true EP0355817A2 (fr) 1990-02-28
EP0355817A3 EP0355817A3 (fr) 1990-12-19

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EP0479712A2 (fr) * 1990-10-01 1992-04-08 UNITED TECHNOLOGIES AUTOMOTIVE, Inc. Composants de relais électromagnétique, positionnés de façon exacte
EP0487069A2 (fr) * 1990-11-21 1992-05-27 Omron Corporation Relais électromagnétique
US5220720A (en) * 1990-10-01 1993-06-22 United Technologies Corporation Method to precisely position electromagnetic relay components
EP1139370A3 (fr) * 2000-03-28 2004-06-16 Matsushita Electric Works, Ltd. Actionneur électromagnétique et relais électromagnétique
WO2008011886A1 (fr) * 2006-07-22 2008-01-31 Festo Ag & Co. Kg Électrovanne bistable
WO2017041913A1 (fr) * 2015-09-11 2017-03-16 Siemens Aktiengesellschaft Appareil de commutation comportant un tube à vide

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EP0100165A2 (fr) * 1982-07-06 1984-02-08 Nec Corporation Relais électromagnétique du type inverseur
EP0118715A1 (fr) * 1983-02-03 1984-09-19 Siemens Aktiengesellschaft Relais électromagnétique polarisé
EP0196022A2 (fr) * 1985-03-25 1986-10-01 EURO-Matsushita Electric Works Aktiengesellschaft Dispositif de commande électromagnétique polarisé

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0479712A2 (fr) * 1990-10-01 1992-04-08 UNITED TECHNOLOGIES AUTOMOTIVE, Inc. Composants de relais électromagnétique, positionnés de façon exacte
EP0479712A3 (en) * 1990-10-01 1992-12-30 United Technologies Automotive, Inc. Precisely positioned electromagnetic relay components
US5220720A (en) * 1990-10-01 1993-06-22 United Technologies Corporation Method to precisely position electromagnetic relay components
EP0487069A2 (fr) * 1990-11-21 1992-05-27 Omron Corporation Relais électromagnétique
EP0487069A3 (en) * 1990-11-21 1993-01-27 Omron Corporation Electromagnetic relay
US5270674A (en) * 1990-11-21 1993-12-14 Omron Corporation Electromagnetic relay
EP1139370A3 (fr) * 2000-03-28 2004-06-16 Matsushita Electric Works, Ltd. Actionneur électromagnétique et relais électromagnétique
WO2008011886A1 (fr) * 2006-07-22 2008-01-31 Festo Ag & Co. Kg Électrovanne bistable
WO2017041913A1 (fr) * 2015-09-11 2017-03-16 Siemens Aktiengesellschaft Appareil de commutation comportant un tube à vide
US10431405B2 (en) 2015-09-11 2019-10-01 Siemens Aktiengesellschaft Switching device comprising a vacuum tube

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