US3382468A - Latching reed relay - Google Patents

Latching reed relay Download PDF

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Publication number
US3382468A
US3382468A US565253A US56525366A US3382468A US 3382468 A US3382468 A US 3382468A US 565253 A US565253 A US 565253A US 56525366 A US56525366 A US 56525366A US 3382468 A US3382468 A US 3382468A
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US
United States
Prior art keywords
coil
contacts
latching
reed
permanent magnet
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.)
Expired - Lifetime
Application number
US565253A
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English (en)
Inventor
Mattes Emil
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3382468A publication Critical patent/US3382468A/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01H51/27—Relays with armature having two stable magnetic states and operated by change from one state to the other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/28—Relays having both armature and contacts within a sealed casing outside which the operating coil is located, e.g. contact carried by a magnetic leaf spring or reed
    • H01H51/284—Polarised relays

Definitions

  • the invention relates in general to relays and in particular to adhesive or latching relays with reed contacts.
  • the latching relay is brought from one operative position into another operative position by a current surge, remaining there, after the exciting current has been switched off, until it is returned to the original position by an oppositely directed current surge.
  • relays are used having contacts which serve as armatnres.
  • One or several reed tubes containing the contacts are surrounded by an excitation coil which produces a magnetic flux to control the armature contacts.
  • Permanent magnets may also be used to control the contacts.
  • the permanent magnet may be formed either as a rod-type magnet or as a ring-shaped magnet which is shifted in the axial direction of the reed tubes to control the contacts. To close the contacts the permanent magnets are moved so that the flux in the operating air gap between the contacts is reinforced, while the magnets are moved so that the flux is reduced when it is desired to open the contacts.
  • a permanent magnet is provided in the known constructions, in addition to the exciting coil, which permanent magnet is magnetized in parallel to the contacts, The permanent magnet is designed to provide a magnetomotive force that is not suflicient to close or open armature contacts but is suflicient to maintain a closed condition in contacts closed after having been excited by the coil.
  • the armature contacts are opened through a magnetic flux produced by the exciting coil in the opposite direction.
  • the responding and dropping excitation is influenced in said direction and in the same magntude. That means the ratio of response excitation and dropping excitation becomes smaller than with relays having no latching eflect.
  • the latching relays of this type which have a copper winding arranged either beside or above the permanent magnet, however, show some substantial disadvantages.
  • the magnetomotive force of the permanent magnet must be dimensioned so that it does not close the armature contact, if the coil is not excited, but keeps said armature contact in the closed condition safely, after the excitation by coil has ceased. This involves vigorous design of the permanent magnet. The design requirements are further aggravated by the heavy tolerance fluctuations that occur during the fully automatic production of reed contacts with regard to the contact spaces of the individual armature contacts and the elasticity of the contact blades. Another disadvantage of the construc-.
  • the object of the invention to avoid the disadvantages of the adhesive relays known and to provide an adhesive relay with reed contacts, constructed in the simplest way, the exciting coil of which can be manufactured cheaply and quickly without using copper and which can be controlled through pulses with a duration of one microsecond.
  • This is achieved, according to the invention, in that instead of copper windings as exciting coils one or several coils of magnetic hard material are used, constructed in the shape of a toroidal tape core.
  • the coils are magnetized through electrically directed pulses either in the same or in the opposite sense as the permanent magnet and, due to the high coercive force of the coil material, influence the operating air gap just as if they were controllable toroidal magnets.
  • the coil is wound of magnetizable tape, electrically insulated on at least one side, the insulation can also be made through methods know per se, as, for example, by a layer of enameled copper wires or by inserting a thin foil.
  • the invention includes a variant in which the coil is wound of magnetizable, electrically insulated wire.
  • the filling coefiicient and the possibility of magnetization is somewhat more unfavourable than when magnetizable tape material is used.
  • the permanent magnet can be provided either as rod-type magnet outside the reed tube or it may enclose said reed tube as toroidal magnet.
  • the exciting coil according to the invention can be arranged on the reed tube either beside or above the permanent magnet. It is also possible that two coils enclose the reed tube on either side of a toroidal magnet. Finally, several reed armature contacts with associated permanent magnets can be enclosed by one exciting coil according to the invention. In a particularly advantageous construction according to the invention an exciting coil according to the present invention is arranged beside an oxide toroidal magnet on the reed tube whereby both, exciting coil and toroidal magnet, are enclosed by a common insulating sleeve.
  • the latching relay according to the invention shows various substantial advantages. It can be easily manufactured particularly due to its simple and small construction.
  • the coil particularly consisting of tape material, can be quickly wound in the simplest manner without using copper, because simple and slowly rotating automatic winding machines can be used due to the small number of winding turns required. After the winding process the expansion of the coil, caused by the resilient property of the material, is prevented by sliding the insulating sleeve over the coil. Thereby, when the coil expands until said expansion is limited by the insulation sleeve, the internal diameter of the coil enlarges and the completely wound coil can easily be removed from the mandrel.
  • Another advantage is that when the armature contact is closed, the coil supports the latching eifect of the permanent magnet after the excitation pulse has been switched oflf due to the remanent magnetizing condition of its material.
  • a considerably weaker permanent magnet can be used than for the constructions known in which the permanent magnet alone must produce the adhesive force. Thereby ditliculties caused by tolerance fluctuations of diiferent reed contacts can be largely eliminated.
  • the most important advantage of the latching relay described, however, is that such a relay can be controlled even with extremely short pulses.
  • the coil material can be changed from one magnetizing condition to the other one by an impulse having a period of one microsecond, thereby causing a suitably directed magnetic flux to switch the reed contact.
  • FIG. 1 shows a cross section through an adhesive relay according to the invention.
  • a single reed contact 1 is shown, enclosed cylindrically by an arrangement, consisting of the oxide toroidal magnet 2, the coil 3 wound of magnetizable tape material, and the insulating sleeve 5.
  • the electrical connections of the coil 3 are indicated by the number 4.
  • the coil 3 is magnetized by a suitably directed impulse so that magnetic flux occurs which is directed oppositely to the flux of the oxide toroidal magnet 2.
  • the coil generated flux weakens the fiux of said permanent magnet.
  • the remanent magnetizing condition of the coil 3 maintains the magnetic flux after the pulse has ceased.
  • the magnetism of the coil 3 is changed by a suitably directed impulse (same direction as the permanent magnetic flux), so that the flux of the coil supports the flux of the permanent magnet whereby the contact closes.
  • the coil influences the operating air gap, after the impulse has ceased, as a toroidal magnet, supporting the permanent magnet, guaranteeing a reliable latching of the contact armature.
  • the latching relay according to claim 1 characterized in this that the coil is wound of magnetizable tape, electrically insulated at least on one side.
  • the latching relay according to claim 1 characterized in this that the coil is wound of magnetizable, electrically insulated wire.
  • the latching relay according to claim 2 characterized in this that the coil is arranged on the reed tube beside an oxide toroidal magnet and both, coil and toroidal magnet, are enclosed by a common insulating sleeve.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Relay Circuits (AREA)
US565253A 1965-07-21 1966-07-14 Latching reed relay Expired - Lifetime US3382468A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST24161A DE1284514B (de) 1965-07-21 1965-07-21 Haftrelais mit Schutzrohrankerkontakten

Publications (1)

Publication Number Publication Date
US3382468A true US3382468A (en) 1968-05-07

Family

ID=7459993

Family Applications (1)

Application Number Title Priority Date Filing Date
US565253A Expired - Lifetime US3382468A (en) 1965-07-21 1966-07-14 Latching reed relay

Country Status (8)

Country Link
US (1) US3382468A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
BE (1) BE684445A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CH (1) CH452705A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE (1) DE1284514B (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
ES (1) ES329359A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
FR (1) FR1487214A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
GB (1) GB1130625A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
NL (1) NL6610261A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3510812A (en) * 1967-04-27 1970-05-05 Nippon Telegraph & Telephone Polarized reed relay
US3967224A (en) * 1975-04-25 1976-06-29 The United States Of America As Represented By The Secretary Of The Navy Coated magnetically biased reed switch
US4048602A (en) * 1975-06-30 1977-09-13 Diamantides Nick D Universal impedance power apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716736A (en) * 1949-12-08 1955-08-30 Harold B Rex Saturable reactor
US2877315A (en) * 1956-06-19 1959-03-10 Bell Telephone Labor Inc Electromagnetic relay
US3222758A (en) * 1962-01-31 1965-12-14 Clare & Co C P Method of making a switching assembly

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1244295B (de) * 1964-07-08 1967-07-13 Telefonbau Schutzrohrkontakt-Haftrelais

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2716736A (en) * 1949-12-08 1955-08-30 Harold B Rex Saturable reactor
US2877315A (en) * 1956-06-19 1959-03-10 Bell Telephone Labor Inc Electromagnetic relay
US3222758A (en) * 1962-01-31 1965-12-14 Clare & Co C P Method of making a switching assembly

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3510812A (en) * 1967-04-27 1970-05-05 Nippon Telegraph & Telephone Polarized reed relay
US3967224A (en) * 1975-04-25 1976-06-29 The United States Of America As Represented By The Secretary Of The Navy Coated magnetically biased reed switch
US4048602A (en) * 1975-06-30 1977-09-13 Diamantides Nick D Universal impedance power apparatus

Also Published As

Publication number Publication date
GB1130625A (en) 1968-10-16
CH452705A (de) 1968-03-15
DE1284514B (de) 1968-12-05
NL6610261A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1967-01-23
FR1487214A (fr) 1967-06-30
BE684445A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1967-01-23
ES329359A1 (es) 1967-05-16

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