Abstract: A d-c electromagnetic relay, designed to open or close a circuit when a current through its exiting coils is either caused to flow or interrupted, and in some applications merely varied in magnitude. It consists of a square or rectangular coil(s) of conducting wire wound around a non-magnetic spool mounted on a "J" shaped magnetic yoke-core which in turn supports an "L" shaped armature attached to the shorter leg of the yoke at a given angle and thereby creating two non-parallel surfaces at the boundaries of the working air gap forming an open "V" at an angle that corresponds to the degree angle formed by the longer leg of the armature in relationship to the top surface of the shorter leg of the yoke, by means of a flat piece of phosphor bronze or the like designed integrally as a leaf spring spring to provide the necessary contact pressure in the open as well as in the closed position, and contact deflection and follow-through, and which is extended to accept the contact point(s).

Abstract: An electromagnetic system having a coil (8), a yoke (10) and an armature (11) is arranged in the upper region of the cap in the relay having a housing cap (1) which is closed at the top, while a contact system (5, 6, 7) is mounted in the lower region in the vicinity of the connection side of the relay. Coil connecting elements (20) are embedded in each case in one side wall of the cap (1), for the connection of the coil winding, in such a manner that their ends open on the top of the cap in each case in a depression (18) which is open to the exterior. During the assembly of the magnet system, winding supporting elements (15), which are provided in each case on the coil former, are inserted into these depressions. The ends of the winding supporting elements (15) and of the coil connecting elements (20) are then be electrically conductively connected from the exterior by soldering or using a conductive adhesive.

Abstract: A highly conductive magnetic material useful for a magnet or a magnetic core for an electromagnet, obtained by molding copper or a copper alloy having ferrite dispersed therein.

Abstract: A normally closed AC relay with a stator core with primary and shaded poles, a pivotal clapper, an elongated leaf spring fixed to the clapper providing a clapper return spring and a clapper overtravel spring extending radially outwardly from the outer end of the clapper, the overtravel spring being substantially narrower than the rest of the leaf spring to reduce the weight and moment of inertia of the overtravel spring and the complete clapper assembly, the overtravel spring having a spring rate significantly greater than the return spring and both the overtravel spring and clapper assembly having a natural frequency significantly greater than twice the frequency of the AC source so that the clapper is actuated to open the relay without incipient switch chatter.

Abstract: In a relay, the magnet system is mounted in the upper zone of a cap-shaped housing, while the contact system (8) is inserted into the housing from the open underside until the contact (91, 92) closes when the magnet system is excited. After further insertion by a prescribed extra way, the contact system (8) is connected to the housing (1) without a stop at its edge (82a). It is therefore possible to compensate manufacturing tolerances during assembly, so that subsequent adjustment of the contact system is not required.

Abstract: A relay activation assembly for use in an electromagnetic relay has a U-shaped core which supports a pair of coils and a spring-biased U-shaped armature nested between the coils. The coils are generally smaller and result in substantial material savings. A pair of flanges extends from the legs of the armature above the coils to provide a flux path between the core and the armature when the coils are energized. Contacts in the relay are actuated by a push rod extending from the armature.

Abstract: The relay has an actuation member (7) which is connected to the armature (6) and which covers by means of a partition (76) the entire surface between the magnet system (2, 4, 5) and the contact system (8) and also surrounds the contact system (8) and/or the magnet system (2, 3, 4, 5) with integral side walls (71, 72, 74) in the form of a tub. As a result, very long creepage distances and clearances between the coil and the contact system are ensured in a relay of small dimensions.

Abstract: In an electromagnetic relay wherein a movable contact spring (9) and a stationary contact spring (10) are inserted by molding into a base block (8), the width of a portion of the movable contact spring and the stationary contact spring within the base block is made larger than that of a portion thereof outside of the base block.

Abstract: A relay has a coil body (1) as a support for a magnet system and also a base. Coil connection elements (3, 4) serve for the connection between coil body and base, which coil connection elements are fastened with horizontal fastening legs (33, 34, 35, 43, 44) in corresponding horizontal insert channels (13, 14, 15, 16, 17) of the coil flanges (11, 12). In addition, wind-on pieces (36, 46) which directly support the winding ends of the coil are formed onto the coil connection elements (3, 4). This results in a manufacture of the relay with few component parts which is simple and can be automated.

Abstract: A switching device (FIGS. 5 A and 5B) employs as actuator a bistable solenoid which includes a plunger (16) movable within a winding (12) between end positions in each of which it is held by permanent magnets (18, 20). The plunger (16) of the actuator is engageable with an insulated lever (86) which in turn actuates a contact blade (76) via a spring (108). The lever may be cranked, and may have an extension (90) outside of the casing (70) to enable the device to be manually operated or to provide a visual indication of the state of the switch. Other types of solenoid may be employed as the actuator.

Abstract: A compact low profile relay fabricated upon a base such as a printed circuit board. A pole piece having a ceramic coating with overlain conductive polymer strips serves as bus bar for coil connection. Spaced ferromagnetic core portions are formed integrally with the pole piece for plural coils which each lie flat when received over a core portion. A generally U-shaped armature is received over each core with the open ends of the legs of the U-shape contacting and pivoted against the pole piece for completing a magnetic loop therewith. Upon energization of the coil, the U-shaped armature passes the end of the coil to effect movement of a switch blade arm to effect switching a pair of load current contacts.

Abstract: An electromagnetic relay has a contact assembly and an electromagnet arranged in side-by-side relation within a housing along its length. The contact assembly includes a fixed contact and a movable contact. The electromagnet includes an excitation coil and an armature movable between two contact operating positions in response to energization and deenergization of the coil. The armature is coupled through a card to the movable contact for engaging and disengaging it to and from the fixed contact in response to the armature movement. A partition extends between the electromagnet and the contact assembly in a width direction of the housing for electrical insulation therebetween. The card has an extended width formed along the width of the partition. The partition has a slit extending in the width direction for receiving the full width of the card such that the card can slide through the slit for contact closing and opening in response to the armature movement.

Abstract: In an electromagnetic relay, a position of an electromagnet assembly (X) having a core (4), a bobbin (1), a yoke (5), a hinge spring (6), and an armature (7) relative to a base block assembly (Y) having a base block (8) and a contact spring assembly (9, 10, 11) is adjusted and fixed.

Abstract: A polarized, reversible magnet with an essentially U-shaped yoke includes an upper coil former flange constructed like a frame and which fronts on yoke legs provided with tab-like integral moldings which in turn engage recesses of the upper coil former flange. Permanent magnets and pole pieces are inserted from above through appropriate openings of the upper coil former flange into the magnetic system.

Abstract: An electromagnetic relay assembly which comprises a relay unit having a generally elongated contact carrier member supported for pivotal movement about a point of pivot and normally biased in one direction, and a casing enclosing the relay unit and including at least first and second wall members angled relative to each other. The casing has a corner opening defined at a corner region between top and side walls and delimited by a first open area in the top wall and a second open area in the side wall. The corner opening in the casing is closed by a covering with the first and second lids covering the first and second open areas, respectively. The side wall has opposite side edges confronting the side open area, and respective portions of the side edges adjacent the top wall are formed with guide members for slidably receiving the second lid when the covering is mounted on the casing.

Abstract: A miniaturized electromagnet has an enhanced armature attraction force and reliable armature movement. The electromagnet comprises an L-shaped flat magnetic plate of magnetic material with a horizontally extending core and a first yoke leg depending from one end of the core. An excitation coil is wound around the core. A second yoke member is formed separately from the magnetic plate into a plate configuration and is coupled secured at its upper end to the other end of the core so as to depend therefrom in an opposed relation to the first yoke leg. The lower end portion of the second yoke leg is bent toward the first yoke leg to define thereat a pole plate extending parallel with the core.

Abstract: The housing has a severable projection (3) at a housing wall in which projection a channel (33, 34) extends proceeding from the interior. The channel has at least two sections (33, 34) having different cross sections that become smaller from inside toward the outside in steps. As a result thereof, an aeration opening of differing sizes can be created for different applications of the component by parting the peg at different locations.

Abstract: The undervoltage tripping device has an electromagnet with a magnet winding (3), a core (10) and an armature (20) and a tripping member (50) able to perform a tripping movement. In the ready-to-trip state the armature is in an attracted position on the core, is spring loaded in the dropping direction, but is prevented from dropping from the core by the magnetic force of attraction produced by the electromagnet. The tripping member is also spring loaded in this state, but is prevented from performing the tripping movement by the attracted armature. The electromagnet is a d.c. magnet. A rectifier is provided for rectifying the current flowing through magnet winding. Mechanical aids are provided for feeding the armature into the attracted position. The tripping member is latched in self-release manner in the ready-to-trip state. The latching effect is released when the armature drops.

Abstract: A relay having a contact and terminal base assembly having a platform with mounting holes formed in corners thereof, to receive depending limbs which extend from the coil and plunger assembly so that, in this way, the two assemblies are mechanically engaged by a socket-type connection. Each assembly, then, may be separately manufactured, to support the contacts and terminals in the one assembly, and to support the coil and plunger in the other assembly, respectively; then, the two are socketed together, to form the complete relay. Such modular construction simplifies manufacturing, and facilitates final, factory adjustments, of each module-assembly, before the two are mechanically joined.

Abstract: A structure for mounting an armature assembly to a frame of an electromagnetic relay is disclosed. Various construction details are developed which disclose a shaped bearing disposed on a frame and an armature assembly having a complementary bearing surface. The engagement of the shaped bearing and bearing surface permits pivoting of the armature assembly while providing capture of the armature assembly to the frame. In one embodiment, an electromagnetic relay (70) includes a frame (72) having a pair of spherical bearings (88, 90) and an armature assembly (78) having a pair of spherical recesses (102, 104) formed and positioned to complement the spherical bearings.

Abstract: A relay includes a base block (A'), an armature block (B') having a pair of armatures (8a, 8b) and a permanent magnet (17a, 17b), and an electromagnet block (C') having an approximately U-shaped core (10). Magnetic pole legs (18a, 18b) of the electromagnet block are inserted through the armatures into the base block, to thereby sandwich the armature block between the base block and the electromagnet block.

Abstract: A state indicating relay wherein a pair of signal contacts connectable to an external electrical circuit are shunted, or opened in response to a bridging contact mounted on the rear of a switching contact mounted on the relay armature. Insulation is provided between the signal/bridging contacts and the power switching contacts of the relay. Operation of the power switching contacts is indicated by the current state of the signal/bridging contacts.

Abstract: A normally closed AC relay having a stator core with primary and shaded poles, an operating coil mounted on the stator core to magnetically attract a pivotal clapper in one pivotal direction thereof toward the stator pole against the bias of a return spring, the clapper and/or stator core having a reduced transverse section in the magnetic loop of the operating coil with a cross-sectional area equal to or less than that of the primary pole to control the magnetic field across the working air gap by magnetic saturation of the reduced section.

Abstract: An electromagnetic relay for consumers with a high switch-on current peak has a main contact and a preliminary contact on legs which extend near one another. The legs carrying the main and preliminary contacts are connected at both sides with another leg via connecting webs and have each a stretch zone between a common connecting yoke of the legs and the connecting webs. At the stretch zones the main and preliminary contacts are adjusted independently of one another by means of squeezing the material of the contact carrier.

Abstract: A relay having a contact spring connected to an armature in which the contact spring is constricted near the free edge of the armature and is broadened into a T-shaped end to provide a double contact or bridge contact relay further includes supporting tabs applied to each of the transverse legs of the contact spring. The supporting tabs are struck by the armature during armature motion directed toward opening of the contacts. This transmits a jolt of force in the immediate proximity of the contact pieces during opening of the contact pieces in order to break any welding or adhesion of the contacts. The relatively weak spring modulus for ensuring closing of the contacts is retained.

Abstract: In an electromagnetic power relay, a spring carrier and a cooperating contact element are plugged into slots in a base member from two opposite sides. Terminal rails extending parallel along the outside walls of the base member to an end face of the relay have, at the end face, portions which are crimped inwardly within pockets in the housing cap. The terminal elements then emerge from the outside walls of the relay at a predetermined insulating distance from the side walls of the relay and form solder and plug terminals. Within the pockets, the terminal elements are provided with fastening projections for anchoring, the fastening projections lying in the inwardly offset planes of the terminal elements. An adequate insulating distance from the side walls of the relay is, thus, provided so that the relays may be tightly grouped on a printed circuit board.

Abstract: A relay with a moveable contact element which is actuated through armature movement transmitted via a slide is switched by the application of torsional forces to the movable contact element. The torsional forces are generated by the slide pushing the leaf spring contact element eccentrically in the region of one edge so that twisting of the contact element occurs during the switching event. A lower spring modulus for a spring of predetermined thickness and dimensions result so that a smaller magnetic system and a smaller overall relay is achieved given matching of the spring force curve to the magnetic system force curve.

Abstract: A direct current relay is disclosed, which is especially fit for railway type signalling systems. The said relay comprises a core (7) extending horizontally through a coil (8), an iron yoke (6) disposed above the core (7), and fixed to the core fore end, and extending along the coil (8) to the core rear end, an armature (11) pivotally mounted at the free end of yoke (6), in front of the corresponding rear end of core (7), and sets of moving and stationary contact members (C1, C2, C3, C4, C5) carried by moving and stationary, elastically flexible strips (24) which project in superposed and reciprocally spaced relationship from a contact carrier block fixed on the yoke (6).

Abstract: An electromagnetic relay having an electromagnetic block with a roughly U-shaped iron core formed with a pair of bent opposing magnetic poles at both the ends thereof and with a coil wound therearound via a spool; and an armature block with both ends thereof opposing the magnetic poles and with the middle portion thereof pivotally supported. A permanent magnet is disposed between the two opposing magnet poles of the iron core so as to oppose said armature. The permanent magnet is supported by a support member formed integral with the spool of the electromagnetic block. The armature is pivotally supported by the electromagnetic block.

Abstract: An alternating current contactor has an armature to be actutated by a magnet system. The armature is operatively connected to a return spring-loaded contact base holding movable contact parts of the contact system. The contact base is here provided with a supplementary mass and brought into operative connection with the armature via a coupling spring, the supplementary mass being movable relative to the contact base and an additionally provided intermediate part to which the armature is coupled. The coupling spring, taking support on the contact base on the one hand, can, on the other hand, bear against an angularly bent end of the intermediate part which is pressed against the supplementary mass. The supplementary mass is applied against a stop at the contact base or being spring-loaded through a separate supplementary spring counter to the direction of movement of the contact base against a stop at the contact base.

Abstract: A flat electromagnetic relay comprises a lead frame having six stamped insert molded circuit leads, an armature frame pivotally supporting a balanced beam armature assembly that carries two contact bars, a coil assembly and an electromagnetic frame having two diagonally arranged pole wings which are on opposite sides and ends of the armature. The armature is biased into a first operative position where the contact bar at one shunts two circuit leads. When the coil is energized, the armature is pivoted into a second operative position where the contact bar at the other end shunts two other circuit leads.

Abstract: An electromagnetic relay is provided with resilient pieces which are formed in one body with movable contacts, spring parts and the contacting parts and fulfils the function instead of movable contact pieces, a coil spring and the woven wires connecting between the movable contacts and the terminals. According to the invention, it is possible to reduce the cost and the dispersion in the performance of the relay.

Abstract: A seesaw electromagnetic switch for controlling a chain/forward/reverse current system includes a seesaw assembly and an exciter set. Springs are provided and disposed between the seesaw assembly and the exciter set to balance the seesaw assembly. Because of this balanced position, even if two coils parallelly disposed in the exciter set are incidently provided with current at the same time and thereby cause the seesaw assembly to swing, no current will flow through the main circuit and no short-circuit will occur in either the forward rotation circuit or the reverse rotation circuit, protecting the motor in use from burning out.

Abstract: The miniaturized power relay for printed circuits comprises an electromagnetic circuit (2) complete with coil (39), a contact-holder block (3) provided with an actuator (25) and a protection and sealing covering (4); the magnetic circuit has exclusively a fixed supporting element (5) and a movable keeper element (6) the respective polar expansions whereof (7, 8) are conveniently shaped so as to reduce dimensions and are accommodated inside the coil to use all of the magnetic flux which is generated by the coil itself.

Abstract: A miniature relay comprises a main body (1) having a coil (2) disposed on a core (3) riveted to a yoke (4), the yoke having a segment (4") substantially parallel to the axis of the coil (2) and receiving an armature (5) withheld by a resilient member (6), which maintains the armature transversely positioned relative to the core (3) and able to be attracted at least by a magnetic field produced by the coil (2), with the armature(5) being further provided with a flexible blade (7) on which two extreme breaker points (8) are held, the assembly being also provided with a supporting base (9), where fixed breaker points (10) are received and in which the extreme breaker points of the blade (7) operate, and a box (11) attachable to the said base (9), with the blade (7) being formed by a bifurcated plate, bordering a portion (12) for interconnection to the armature body and two elongated coplanar branches (13), whose free ends receive the breaker points (8) and, adjoining the point of bifurcation, are provided with a

Abstract: An electromagnetic relay, comprising: an electromagnetic coil; an iron core passed centrally through the electromagnetic core; a yoke having a first end connected to a first end of the iron core; and an L-shaped armature, having a short piece and a long piece connected to each other via a corner portion, pivotally supported by a second end of the yoke at its corner portion so that the short piece may move toward a second end of the iron core by magnetic attraction when the electromagnetic coil is energized and move away from the second end of the iron core by a spring force of spring means when the electromagnetic coil is de-energized. The second end of the yoke may be provided with a part having a locally enlarged cross section to reduce the magnetic resistance at the interface between the armature and the yoke. The short piece of the armature may be provided with a projection near the corner portion which slides along a fixed surface in order to keep the armature resting upon the yoke in a stable fashion.

Abstract: A relay includes a leaf spring for bearing an armature at a free end of a yoke, the leaf spring forming, first, a bearing plate lying against the yoke and, second, a pull-back spring applied thereto in one piece. The pull-back spring has a first section cut free from the middle of the bearing plate so that the bearing plate is subdivided into two plate sections on which the armature rests only at its lateral regions on its bearing edges. Further, the pulled-back spring as its free end cut arcuately roughly symmetrical to the center axis of the bearing plate to exert an approximately symmetrical pull-back force on the armature.

Abstract: Disclosed is an electromagnetic relay whose armature assembly is protected against jarring impacts. The armature assembly is tiltably supported in a recess stamped out in an end portion of the magnetic yoke of the relay. Lateral inner walls of the recess are formed at their free ends with shoulders for engaging a flat biasing spring of the armature assembly. At least one lateral portion of the magnetic yoke delimiting the recess is formed with a constricted region, for example with a cutout in a corner between an inner wall and the bottom wall of the recess. The constriction permits the bending of the lateral projection into an open condition in which the corresponding shoulder is out of the way during the insertion of the armature assembly into the recess. Upon the insertion, the lateral projection is bent toward the armature until the corresponding shoulder overlaps the armature edge.

Abstract: The electromagnetic relay, particularly an armature relay, includes a ferromagnetic yoke with a yoke wall, and a ferromagnetic coil core, which is mounted by inserting a neck portion thereof in a hole in the yoke wall, for example in a press fit. To provide a connection between the coil core and the yoke which is more permanent, a support for the coil core is provided on the yoke wall which includes a projection on the inner surface of the yoke wall and a recess in an outer surface of the yoke wall (4) on an opposing side from the projection on the inner surface (27). The projection (28) extends from the inner surface of the yoke wall toward a shoulder (32) of the coil core (7). The neck portion (6) of the coil core (7) extends into the recess (29) and a rivet (39) for fastening the neck portion (6) in the recess (29) of the support (26). The recess (29) and the projection (28) are approximately equal. A method of making the electromagnetic relay is also described.

Abstract: A contact device is provided with an additional mass member secured to a movable contactor carrying a movable contact capable of opening and closing contacts with a stationary contact, for providing to the movable contactor a mass acting in a direction perpendicular to longitudinal axis of the contactor. A rolling motion is thereby caused to occur in the movable contactor upon contact closing motion so that the movable contact can be prevented from being fusion-bonded to the stationary contact.

Abstract: A relay comprising an electromagnetic coil wound on an insulating bobbin, the central cavity of which encloses a central spring-biased contact actuated by a magnetic armature in response to energization of the coil, to make or break contact with one or more fixed contacts also enclosed. A U-shaped member and a heel plate, both of highly magnetically permeable material, surround the coil and complete the magnetic circuit for flux generated by the coil. The magnetic armature is constructed and arranged such that it is accessible from the exterior of the enclosed relay to adjust the position of the spring-biased contact of the relay after it is assembled to conform with the desired level of voltage required to actuate the relay.

Abstract: An electromagnetic relay 38 (FIG. 2) includes a cylindrical core 42 concentrically positioned within a coil assembly 40 and press fit into a frame 50, a resiliently mounted armature assembly 56, and electrical contacts 66,68, one mounted on the armature assembly 56 and one disposed in a fixed relationship to the frame 50. The coil assembly 40 is secured to the frame 50 by the use of extrusions 54 which precludes the need for a core head 24 and crush ribs 26 (FIG. 1). After assembling the relay 38, the core 42 is positioned by pressing the armature assembly 56 directly opposite the core 42 until the core 42 travels a predetermined distance beyond the electrical contact point for the contacts 66,68. This invention ensures precise positioning of the functional components and negates the accumulation of manufacturing tolerances in the relay 38.

Abstract: A flat electromagnetic relay comprises a lead frame having six stamped insert molded circuit leads, an armature frame pivotally supporting a balanced beam armature which carries two contact bars, a coil assembly and an electromagnetic frame having two diagonally arranged pole wings which are inside the armature frame adjacent opposite side ends of the armature. The armature is torsionally biased into a first operative position where the contact bar at one end shunts two circuit leads. When the coil is energized, the armature is pivoted to a second operative position where the contact bar at the other end shunts two other circuit leads.

Abstract: An electromagnetic actuator driver apparatus having a bobbin with an electrical coil wound around the central portion thereof and positioned within a permanent magnetic generated flux field structure. A drive arm is engaged by bobbin fingers at the input end of the drive arm to deflect the output end of the drive arm by a predetermined amount in response to a control signal which is applied to the electrical coil.

Abstract: An electromagnetic relay, comprising: a electromagnet consisting of an iron core and a solenoid wound thereon; a yoke extending in parallel with the electromagnet and attached to one end of the iron core; an armature pivotally attached to a part of the yoke adjacent to another end of the iron core at its base end; a fixed contact unit provided adjacent to the electromagnet; an pivotally supported moveable contact carrier; an extension arm extending from the armature and having a free end adapted to abut an actuation point of the moveable contact carrier located between its pivoted point and a moveable contact piece carried thereby; the moveable contact piece being adapted to cooperate with a fixed contact member provided in the fixed contact unit.

Abstract: Each of first and second contact blocks includes a substantially rectangular insulating member, a pair of stationary contact members projecting inward from the insulating member and supported with a predetermined interval therebetween, a movable contact member arranged between the pair of stationary contact members and supported by the insulating member, and first, second, and third terminals for electrically extracting the pair of stationary contact members and the movable contact member, respectively, and projecting from a base portion of the insulating member with predetermined intervals therebetween. An electromagnet includes a movable member for commonly acting on the movable contact members of the first and second contact blocks to move each movable contact member toward one of the pair of stationary contact members of each of the first and second contact blocks.

Abstract: An electromagnetic relay comprises a force transmitting member for displacing a movable contact point member as an armature moves, to come in contact with a fixed contact point member. A pressing portion of the force transmitting member which is in contact with the movable contact point member is formed of a shape memory material restoring a previously memorized shape at or above a predetermined temperature. The fixed contact point and the movable contact point are abraded resulted from the long-term use of the electromagnetic relay, thereby reducing contact pressure between the two contact points and correspondingly increasing contact resistance, so that the contact points overheats.

Abstract: A miniature flat relay comprising upper and lower insulating housing member. The lower member has a coil which snugly fits therein. The coil contains a core with a centrally located permanent magnet which energizes a U-shaped magnetic structure and provides a fulcrum for seesaw mounting an elongated armature. Movable electrical contacts project from opposite ends of the armature. A central section of the contacts forms hinge sections which project therefrom in order to secure the armature at said fulcrum. The armature may be made either bi-stable or monostable.

Abstract: An electromagnetic relay is provided with a movable contact sloped at a prescribed angle relative to an attracted face of an armature and a fixed contact sloped at a prescribed angle relative to an attracting face of a core. In this electromagnetic relay, it is possible to contact the movable and fixed contacts slidingly each other even when the armature is attached so as to be in contact with a frame.

Abstract: An electromagnetic relay having an electromagnetic block with a roughly U-shaped iron core formed with a pair of bent opposing magnetic poles at both the ends thereof and with a coil wound therearound via a spool; and an armature block with both ends thereof opposing the magnetic poles and with the middle portion thereof pivotally supported. A permanent magnet is disposed between the two opposing magnet poles of the iron core so as to oppose said armature. The permanent magnet is supported by a support member formed integral with the spool of the electromagnetic block. The armature is pivotally supported by the electromagnetic block.