US2182452A - Electromagnetic relay - Google Patents

Electromagnetic relay Download PDF

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Publication number
US2182452A
US2182452A US118793A US11879337A US2182452A US 2182452 A US2182452 A US 2182452A US 118793 A US118793 A US 118793A US 11879337 A US11879337 A US 11879337A US 2182452 A US2182452 A US 2182452A
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United States
Prior art keywords
armature
spring
relay
armatures
arm
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Expired - Lifetime
Application number
US118793A
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English (en)
Inventor
Rose William Robert
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General Electric Co PLC
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General Electric Co PLC
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Filing date
Publication date
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Publication of US2182452A publication Critical patent/US2182452A/en
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/02—Non-polarised relays
    • H01H51/04—Non-polarised relays with single armature; with single set of ganged armatures
    • H01H51/06—Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored during the movement in the first direction, e.g. by using a spring, by using a permanent magnet, by gravity
    • H01H51/10—Contacts retained open or closed by a latch which is controlled by an electromagnet

Definitions

  • the present invention relates to electromagnetic relays, and has for its object the provision of a two-position relay having improved operating characteristics, whilst at the same time emplglying as many standard or known parts as pos-
  • a relay having an L-shaped yoke, and an armature pivoting on a knife edge on the said yoke and acted upon by an operating coil carried by the yoke, the armature being adapted to move contact springs arranged in piles which are mounted on the same yoke.
  • This type of relay is arranged to remain normally in an unoperated position, the armature and contact springs moving to an operated position and remaining so, only so long as current is applied to the operating coil.
  • a relay of the two-position type comprises two entirely separate magnetic circuits, each one composed of an operating coil and core, a yoke and an armature, the said magnetic systems being disposed side by side, the two armatures being so interlinked by a rocking member that operation of one by a current through its associated coil causes positive release of the other, the interlinking mechanism being such that the armature last operated remains in this position until the other armature is operated in turn.
  • two relay assemblies of the type used in telephone systems are mounted side by side on a common plate. Their armatures are interlinked by a rocking member extending from one to the other and pivoted about an axis passing at right angles through a line drawn parallel to, and midway between the axes of the operating coils of the relays.
  • This said member carries an arm extending into the space between the two relays, its end co-operating with a flat spring bowed and supported between a V notch at one end and a further fiat spring at the other.
  • This latter spring is tensioned so as to efiect the curvature of the former spring, the said tension being of suflicient strength toensure that after the operation of one armature and consequent release of the other, the moving parts are maintained in this position until the energisation of the operating coil of the released armature.
  • Either one or both armatures may operate one or more sets of contact springs, and adjustments are provided whereby the retaining action of the bowed spring is compensated for varying contact spring loads. Further adjustments may be provided to compensate for the effects of manufacturing tolerances on the core lengths, and also to correct any possible eccentricity of the pivot on which the member co-operating with the two armatures is mounted.
  • Figure 1 of which shows a partly dismantled relay
  • Figure 2 a view of the relay seen from the armature end
  • Figure 3 a part sectional view taken along line A-A of Figure 2.
  • this shows one of the magnetic circuits employed and the device for holding the armatures of the relay in either one of two positions without energisation of either of the operating coils.
  • the magnetic circuit shown comprises a coil I, wound on a core 3, the latter acting upon an armature l pivoted about a knife edge 2.
  • This knife edge is part of a yoke 5 which is L-shaped, and to which is clamped the operating coil and core.
  • the armature, yoke and core of the operating coil form a magnetic circuit, and the whole is mounted on a base plate I by means of screws.
  • the armature is normally held away from the core 3 by the tension of flat contact-making springs mounted in insulating supports on the yoke.
  • a centre piece 6 fixed to the base plate I is provided, this centre piece carrying a rocker 9 pivoted about an axis N].
  • This rocker is provided with a transverse portion one end of which co-operates with one armature while the remaining end engages with another armature forming part of the second coil assembly (not shown), which is exactly similar to that disclosed in the drawing, this second assembly being fixed to the base plate by screws passing through the holes 52.
  • each end of the rocker 9 carries a bead 32 which bears upon one of the armatures and is locked thereto by means of a Z-shaped bracket ll screwed to the armature.
  • the rocker also carries an arm M which extends into the space between the two magnetic circuits.
  • the end of this arm is forked and engages with the middle of a bowed spring 13 which at one end engages with a V groove in the centre member 6 and at the other end with a slot in a pin l! which slides freely in a hole in the centre member 5.
  • Pressure is applied to the pin I1 and hence to the spring 13 by means of a further spring 2! this latter spring being fixed firmly to the centre member 6 by screws 2
  • the tension on this spring 20 is such as to maintain the spring 83 in a bowed state, the arrangements being such that when either armature is attracted sufiiciently strongly by its operating coil to move the spring ii! from one extreme position to the other, the armature rocking member and contact springs are retained in this latter position, even though the energisation of the operating coil is removed. Subsequent energisation of the operating coil moves the assembly back to its previous position.
  • each armature acts upon two sets of changeover contact springs, but many more than these can be carried by each yoke.
  • An adjustment for this force is provided by applying pressure to the spring 20 by means of a screw 22 having a frustro-conical head, the screw being mounted in and engaging with a thread on the centre piece 6.
  • the slot in the screw head is accessible from the front of the relay even when the latter is mounted and in position on a rack. Rotation of the screw in a clockwise direction applies increased pressure to the spring 2!! and hence through the pin I1 to the spring l3. Rotation in the opposite direction reduces the pressure applied to spring I3.
  • Fig. 2 It will be seen from Fig. 2 that the two operating coils lie with their axes parallel, the armatures operating on knife edges 2 and being ret ained thereon by means of the screws and springloaded washers M as shown in Figs. 1 and 3.
  • the contact springs are supported near their front ends by means of a stepped insulator 25 and are fixed at their rear ends between insulating members 26.
  • the clip 21 mounted on the front of the rocker has a bent over extension 28 which retains a pin in position through the rocker, this pin acting as the axis Ill about which the rocker rotates.
  • the centre member 6 can be and is preferably of a non-magnetic material. This assists inpreventing false operation of the relay caused by interaction of the flux produced by the two coils. some of which may traverse the centre member if it is of magnetic material.
  • This adjustment also provides means for correcting the eccentricity of the pin in which. the rocker pivots. Correction is performed in a manner similar to that described for inequality of core length.
  • this adjustment enables the tension provided on the arm by the bowed spring to be adjusted unevenly on each side, this providing correction for unequal numbers of contact springs operated by the two armatures.
  • An interlinking device adapted for mounting on the common base midway between two similar relays to maintain the armatures thereof in opposite positions, said device comprising a center supporting structure, an integral member associated with the armatures. of the relays and arranged to rock on an axis of the center structure midway between said relays, a pin, flat springs, and an arm with one end rigidly attached to said integral member and the other end terminating in a fork engaging the middle of one of said springs supported in a bowed position between a V notch in said center structure and a slotted end of said pin which is free to move and extends through a hole in said structure, and said pin conveying pressure of another flat spring to maintain the bow in the first named spring.
  • An electromagnetic structure comprising two similar relays mounted side by side, a common interlinking device mounted between them, said interlinking device comprising a rocking member pivotally associated with the armatures of said relays for holding the operated relay op erated after said relay is deenergized and until the associated relay is energized and preventing operation of the associated relay while the operated relay is energized, an arm, as a unitary part of said rocking member, extending into the space between the relays and terminating in a forked end, a flat spring in contact at its midpoint with the forked end of said arm, and variable means for causing said spring to bow to either side of its center line.
  • An electromagnetic structure comprising two similar relays mounted side by side on a common plate, an interlinking device with supporting structure mounted between the relays on said plate, said device comprising an integral member interlinking the armatures and rocking on an axis passing midway between the armatures and parallel to said mounting plate, an arm rigidly attached to said integral member terminating in a forked end extending into the space between the relays, a flat spring supported in a bowed position and in association at its midpoint with the forked end of said arm, thus insuring one armature remaining in an operated position and the other in a normal position, another flat spring bearing against said first spring to maintain said bowed position, and means for varying the tension of the latter to effect the tension of the first named spring.
  • an interlinking device supported between the relays insuring that either one remains operated while the other is at normal, said interlinking device comprising a rocking member having a relative association with each armature and rocking on an axis midway between the armatures and parallel to the mounting plate, an arm, adjustably attached to said rocking member, terminating in a forked end extending into the space between the relays, a flat spring supported in a bowed position and associated at its midpoint with the forked end of said arm, means for varying the amount of bowing of said spring and means for varying the association of said arm with said rocking member to compensate for differences in the armature spring loads.
  • An electromagnetic relay comprising two separate relays disposed side by side each having an operating coil and a core, a yoke and an armature, an interlinking mechanism for holding the armatures in either one of two positions without energization, an integral member therein pivotally mounted on an axis perpendicular to a plane containing the axis of the armature and passing midway between the armatures so that operation of one armature by a current through its operating coil causes the positive release of the other armature, the interlinking mechanism between the two armatures being such that the armature last operated remains in this position until the other armature is operated in turn.
  • a relay comprising two separate electromagnetic systems disposed side by side each having an operating coil and a core, a yoke and an armature, a device for holding said armatures in either one of two positions without energization of their operating coils, an interlinking rocker therein extending from one armature to the other armature and pivoted about an axis at right angles to a plane passing through the axis of the armatures and midway between the axis of the operating coils, flat springs, one spring bowed between a V notch at one end and another of said springs at the other end, an arm carried by said rocker extending between the relays and interacting with said one spring toretain said armature in the position to which they are last operated.
  • An electromagnetic arrangement comprising two relays disposed side by side each having an operating coil and core, a yoke and an armature, an interlinking member for holding the armatures of said relays in either one of two alternate positions without energization, said member extending from one armature to the other armature and pivoted about an axis passing midway between the armatures at right angles to a plane including the axis of said armatures, fiat springs combined so that a first spring rigidly fixed at one end may bear on a second spring so that said second spring is maintained in a bowed position between said relays, and an arm extending from said member to the bowed portion of said second spring for retaining said armatures in one of said positions.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
US118793A 1936-02-05 1937-01-02 Electromagnetic relay Expired - Lifetime US2182452A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3429/36A GB465300A (en) 1936-02-05 1936-02-05 Improvements in or relating to electro-magnetic relays

Publications (1)

Publication Number Publication Date
US2182452A true US2182452A (en) 1939-12-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
US118793A Expired - Lifetime US2182452A (en) 1936-02-05 1937-01-02 Electromagnetic relay

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US (1) US2182452A (de)
BE (1) BE419785A (de)
GB (1) GB465300A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440888A (en) * 1945-02-20 1948-05-04 Gen Controls Co Electromagnetic device with armature
US2857776A (en) * 1955-01-13 1958-10-28 American Metal Prod Lead screw selectively operable and releasable under load

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2440888A (en) * 1945-02-20 1948-05-04 Gen Controls Co Electromagnetic device with armature
US2857776A (en) * 1955-01-13 1958-10-28 American Metal Prod Lead screw selectively operable and releasable under load

Also Published As

Publication number Publication date
GB465300A (en) 1937-05-05
BE419785A (de)

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