US2611063A - Electromagnetic relay - Google Patents

Electromagnetic relay Download PDF

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Publication number
US2611063A
US2611063A US181903A US18190350A US2611063A US 2611063 A US2611063 A US 2611063A US 181903 A US181903 A US 181903A US 18190350 A US18190350 A US 18190350A US 2611063 A US2611063 A US 2611063A
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United States
Prior art keywords
armature
mass
contact
spring
inertia
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Expired - Lifetime
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US181903A
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English (en)
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Carpenter Rupert Evan Howard
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Individual
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Individual
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position

Definitions

  • This invention relates to the mounting and control of the contacts of electrical .circuit- 1 controlling apparatus such as electrical switches and circuit-breakers of all kinds but it has particular reference to the contacts of electromagnetic relays, and is more particularly concerned with the construction and control of the vibratory armature and the mounting and sup- ;port of the passive or side contacts of such relays.
  • a fundamental problem encountered in the design of electromagnetic relays is that of pre- Wenting Ibouncing orchattering of the contacts, .and this problem becomes more difficult of solution as the contact travel, and hence the velocity of the moving contact at the instant of impact, is increased.
  • the present invention aims at eliminating both these forms of contact bouncing, and it is especially useful in relays having long contact .traveL although not, of course, limited to electromagnetic relays of any kind.
  • this - is attained by providing a mass mounted on one or both'of the supports of the pair of contacts to be controlled in such a Way as to be able to move relatively to that support due to the inertia ofthe mass.
  • operating at the instant of change of velocity caused by the closing of the pair of contacts and the relative movement is restrained mainly or largely by the action of forces set up by friction occurring between bearing surfaces shaped to slide smoothly one upon another or by fluid friction or by friction occurring Within a -deformable body.
  • an electro- Vmagnetic relay with a vibratory armature the case of an electro- Vmagnetic relay with a vibratory armature
  • inertia mass may thus be mounted on the arma- 'ture -or on the support or supports of the passive contact or contacts or both.
  • the frictional v'ffc'irces may be exerted on ⁇ a surface of the mass or within a body of deformable material coupling the mass to the respective contact support so that a drag is applied to the contact support and the contacts are maintained closed in spite of any tendency to bouncing due to the elasticity of the parts.
  • the frictional coupling of the inertia mass to its contact support is of the nature of resistance coupling rather than capacity coupling and the restraining force operates immediately deceleration of the contact and its support begins.
  • the system is unlike that of a mass mounted on a compliant support and the latter would not result in the desired reduction or elimination of contact chatter.
  • the frictional drag is exerted through an external surface of the mass, in the case of the armature contact of a relay, it may be applied to the end surface or a side surface of the armature or of a member fixed to the armature.
  • the force holding the frictional surfaces in engagement may be provided either by a spring pressing the sliding mass against the armature or, by making the sliding mass of magnetic material, when magnetic attraction, due, for example, to stray flux from the armature, may provide the necessary force.
  • the sliding surfaces may bear directly upon one another, or an interposed layer, such as a washer, having the desired frictional and wear-resisting characteristics may be employed, a synthetic resin impregnated with graphite or some soft metal having been found suitable.
  • the spring may be made adjustable so as to control the frictional force.
  • the spring may be a cylindrical coiled compression spring housed within the inertia mass and bearing on a seating in the mass at one end and constrained by a fixed member at the other end. Then, when the mass slides relatively to the armature, the spring is deformed and in recovering,'tends to centralise the mass.
  • the fixed stop engaging one end of the spring may comprise the head of a stem projecting vfrom the armaf pads.
  • the frictional dragy is exerted within a body of rubber-like material which should exhibit considerable hysteresis, the latter is deformed on the mass tending to overshoot the armaturev and thereby energy is expended yinthematerialv ⁇
  • the body may due to its mechanical hysteresis. then consist for example of ⁇ a pad of soft material, such as felt or natural or artiiicial rubber* cemented to the armature and surmounted by a metal weight forming the inertia.'V mass and clamped between the said pad of material and a second similar outer pad of soft material.
  • a stem may project up from the armature through Ythe adjacent pad and passes through a clearing holle in. ⁇ the metal mass so that the latter overfthe armature face.
  • the frictional drag or damping may be provided by employing a'ring of 'felt or other'rubber-like material encircling an extension of the said outer 4part ofthe arm sothat'as vibration' is impartedA to the ⁇ cantilever arm, the said ring is deformed in compression- Figure 4 is a plan of Figure 3;
  • Figure 5 is an elevation
  • Figure 6 is a plan corresponding respectively' to Figures 3 and 4 but showing a modified form of the armature damping member
  • Figure 7 is a sectional edge elevation of the upper part of an armature showing another form or" the anti-bouncing device
  • Figure 8 is a sectional elevation on the line VIII- VIII in Figure 9.
  • Figure 9 a plan of another form of damping member employing an inertia mass including A' deformable rubber;
  • Va pin may'extend from the said ex- -tension vof the outer part of the arm towards vthe relay frame and may itself be encircled by vajring of the deformable material enclosed in ramletal ring which forms the inertia mass.
  • the spring arm bearing the ycon- A tact isextended and inclined inwards towards the relay frame at an angle and is straddled r"bya vstrip of; deformable material which isencased ina metal strip which forms the inertia ⁇ mass.
  • Figure 2 is a plan of the same
  • Figure 10 is a side elevation; and v Figure 11 a section on the lneXI-XI in Figure 10 of one form of the improved stationary orA passive contact; Y
  • Figure 12 is a side elevation; and Figure 13 a section on the line XIII-XIII in Figure 12 of another form of stationary contact;
  • a Y'screwthreaded ⁇ stemfi is adjustably tapped rinto the upperend of the'armature 2 andis secured by a lock-nut 8 of Duralumin which consists 'fof-fa hexagonal shank 9- and a at circular ⁇ platform I0.
  • a lock-nut 8 of Duralumin which consists 'fof-fa hexagonal shank 9- and a at circular ⁇ platform I0.
  • On Athe top Vof the'latter is --supportedfa washer II which, in 'this vexe'miple,'consists r ⁇ of the phenol-formaldehyde resin'knownas Catalifn and is impregnated with graphite.
  • the cylindrical mass Sjrests on the washer II yand'fsur- 1 rounds the stemAI which passes through aclearinghole I2 in the base vof the massfj Afccnidal Ycoiled compression spring Iisjhoused'- in'the Lcylinder E and abuts at the botto'mon the vupper 'surface of vthe vbase Vof the'jcylinderV 6 andf'fat "the-top against the* head Illfoftheste'm 7.
  • vThe spring I3 thus pressesthejmassv r6fagainstthe washer II and 'the' latter againstwtheplatfrm I il fixed' to the armature 2 with an adjustable pressure.
  • each Contact,l 4 carriedA on a stm; iiat cantilever spring I5 rivetted ⁇ to one of fthe? relay ⁇ 15 frame members'S at. I6..
  • the Vpart I8 carries the stationary contact 4.
  • the partl I8 is extended and turned over at 2
  • a strip of neopreneA 22 is bent to embrace thepart 2
  • a modified device isshcwn which may replace lthe inertiamass 6 shown in Figures 1 to 4.
  • a Vscrew-threaded stem 1 is adjustably tapped into the end of the armature I and is surrounded by a washer 24 seated on the end of the armature 2, a synthetic resin washer 25, the boss of a bracket arm 26, anda further synthetic resin washer. 21.
  • This pack is adjustably pressed together by va cylindrical coiled spring 28 abutting at its lower end against a cup 29 and at its upper end against an enclosing cap 30; the wholerbeing held down by a nut 3I screwed on to the stem 1 and enabling the pressure to be adjusted.
  • the bracket arm 26 supports the inertia mass ⁇ 32 which is a cylinder threaded over a second stem 33 and held by nuts 34.
  • a small entirely closed cylinder 53 is xed to the top surface of the armature 2 and contains a looselyfitting slidable piston 54 which forms the inertia mass.
  • the spaces 55 on either side of the piston 54 are filled with light oil which provides the frictional force restraining the movement of the piston 54.
  • Conical springs 56 at either end of the cylinder 53 serve as stops for the piston 54 and assist in centralizingr the latter.
  • FIG. 8 and 9 Yet another variant is shown in Figures 8 and 9 in which a stem 'I is again screw-threaded andV tapped into the end of the armature 2.
  • a circular pad 31 of felt encircles the stem 1 and rests on a washer 4I seated on the end of the armature 2.
  • On the pad 31 rests a metal weight 38 which forms the main inertia mass and has a clearing hole 39 through which the stem 1 passes.
  • a second pad 40 of felt rests on the weight 38 and the three members 31, 38 and 40 are pressed on to the end of the armature by a top washer 4Ia and nuts 42, the pad 31 being preferably cemented to the Washer 4I and to the weight 38 and the pad 40 also being cemented to the weight 38.
  • a ring of felt 45 encircles the pin 44 to which it is fixed by adhesive and thering 45 is encased in a metal ring 46 which acts as the inertia mass. Otherwise, the operation is the same as in the case of Figures 10 and 11. l
  • the part I8 of the cantilever spring i5 which bears the station-l ary contact 4 is turned at right angles at 41 into thevertical plane and vbroadened into a platform 48.
  • a narrow extension 49 is looped tothe side at 50 and turned over into contact with the platform 48 at 5I. At that point, it carries the inertia mass 52 which is a cylindrical weight.
  • the spring loop 50 is set so that it causes the mass 52 to be frictionally coupled to the contact 4 throughl the platform 48 on the supporting arm I8.
  • an electric switch having a pair of cooperating contacts, one of which is mounted upon a movable support
  • a switch according to claim 1 wherein said movable support comprises an armature member carrying the movable contact.
  • a switch structure according to claim 1 wherein said movable support comprises a yieldable member carrying a passive contact.
  • a switch structure according to claim l wherein said frictional coupling is provided by sliding contact between a surface of said inertia member and a surface on said movable support, and including spring means for holding said surfaces in contact under pressure.
  • a switch structure according to claim 1 wherein said frictional coupling means comprises a body of deformable material connecting said inertia member with said movable support and having appreciable internal resistance.
  • said inertia member comprises a body of deformable material mounted upon said movable support and being connected with said support by a resilient portion thereof having an apprecif ableinternalfresistance, whereby..zsaid.resilient :portion forms: alIrietiona-l Y couplings mecanicveens'aid body-.andsaidsupport and opposesrelativefmov ment-betweenssaid bodyaand saidsupport. ⁇
  • saidinertia member comprises aV body of resilient'deformablematerial mounted Aon an extension' of said spring:
  • alever arm carrying''saidinertia member on'one of said arm to 'saidimovable supportV for lpivotal movement about an axis arranged transversely c BEYFERENCESQITED.
  • The" ⁇ ollowing;V references'. are. of record ⁇ inthe file of this -patent:Y .c i A ,ly

Landscapes

  • Vibration Prevention Devices (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Manufacture Of Switches (AREA)
  • Electromagnets (AREA)
US181903A 1949-09-02 1950-08-28 Electromagnetic relay Expired - Lifetime US2611063A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB287696X 1949-09-02

Publications (1)

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US2611063A true US2611063A (en) 1952-09-16

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Application Number Title Priority Date Filing Date
US181903A Expired - Lifetime US2611063A (en) 1949-09-02 1950-08-28 Electromagnetic relay

Country Status (5)

Country Link
US (1) US2611063A (en(2012))
BE (1) BE497865A (en(2012))
CH (1) CH287696A (en(2012))
FR (1) FR1025083A (en(2012))
GB (1) GB673867A (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4601362A (en) * 1983-05-19 1986-07-22 Garrard Products Limited Device for damping an oscillatory system
US20040055410A1 (en) * 2000-12-14 2004-03-25 Bsh Bosch Und Siemens Hausgerate Gmbh System for damping vibrations coming from a motor

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1557683A (en) * 1976-10-20 1979-12-12 Nedosekov S S Electric switches
GB2517972A (en) * 2013-09-06 2015-03-11 Eaton Ind Netherlands Bv Circuit breaker

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE376612C (de) * 1921-04-23 1923-06-01 Klein Peter Daempfungseinrichtung fuer Schwingungssysteme mit raschem Geschwindigkeitswechsel, insbesondere fuer schwingende Kontakte
US2540854A (en) * 1949-03-29 1951-02-06 Gen Electric Friction contact damper

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE376612C (de) * 1921-04-23 1923-06-01 Klein Peter Daempfungseinrichtung fuer Schwingungssysteme mit raschem Geschwindigkeitswechsel, insbesondere fuer schwingende Kontakte
US2540854A (en) * 1949-03-29 1951-02-06 Gen Electric Friction contact damper

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4601362A (en) * 1983-05-19 1986-07-22 Garrard Products Limited Device for damping an oscillatory system
US20040055410A1 (en) * 2000-12-14 2004-03-25 Bsh Bosch Und Siemens Hausgerate Gmbh System for damping vibrations coming from a motor

Also Published As

Publication number Publication date
BE497865A (en(2012))
FR1025083A (fr) 1953-04-10
GB673867A (en) 1952-06-11
CH287696A (fr) 1952-12-15

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