US3214533A - Reed-relay with adjustable ferrite element - Google Patents

Reed-relay with adjustable ferrite element Download PDF

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Publication number
US3214533A
US3214533A US201872A US20187262A US3214533A US 3214533 A US3214533 A US 3214533A US 201872 A US201872 A US 201872A US 20187262 A US20187262 A US 20187262A US 3214533 A US3214533 A US 3214533A
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US
United States
Prior art keywords
bars
relay
ferrite
flux
reed
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
US201872A
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English (en)
Inventor
Scata Mario
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
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International Standard Electric Corp
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Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3214533A publication Critical patent/US3214533A/en
Anticipated expiration legal-status Critical
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    • 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
    • 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

  • This invention relates in general to reed-relays and in particular to reed-relays having an adjustable ferrite element positioned externally of the relay. Its principal object is to provide a reed-relay whose sensitivity can be altered simply and economically to adapt the relay for a wide variety of applications.
  • Prior-art arrangements are known in which reed-relays of the 1r type have ferrite elements rigidly secured between the magnetic terminals protruding from the relay.
  • the combination of the magnetic flux from the ferrite element and from the energizing coil of the relay permits the contact sensitivity to be set at a desired value.
  • These prior-art devices have the disadvantage that the sensitivity of each relay is dependent upon the components selected and once adjusted are not readily changeable without substitution of different-valued components.
  • a reed-relay having a polarized ferrite ring encircling the external terminals of the relay, which ring when rotated varies the resulting flux such that a wide variety of sensitivity levels may be obtained.
  • a feature of the invention resides in the arrangement wherein the adjustment of the sensitivity of the relay can he made without removing the relay from associated equipment.
  • FIGS. 1 to 4 are drawings
  • FIG. 1 shows a side view of a known 1r type reedrelay having a ferrite ring element positioned around its magnetic terminals;
  • FIG. 2 shows an end view of the relay of FIG. 1 with the magnetic axis of the ferrite element lying within the plane of the relay terminals;
  • FIG. 3 shows the ferrite element of FIG. 2 with its magnetic axis normal to the plane of the relay terminals
  • FIG. 4 shows the ferrite ring of FIG. 2 with its magnetic axis located intermediate a plane parallel to the terminals of the relays and a plane normal to the terminals of the relay.
  • the reedrelay comprises a glass envelope 1 containing magnetic contacts 2 and 3 sealed therein in an air-tight manner.
  • a coil 5 encircles the relay near the contact points of the noted magnetic contacts and ferrite ring 4 encircles the external portion of the relay terminals.
  • Ring 4 consists of a ferro-magnetic material having the characteristic of an electrical insulator and thus can mechanically contact the terminals 2 and 3 protruding from envelope 1 to frictionally hold the ring in any rotated position without adversely affecting the electrical circuit. Also, the ferrite ring 4 has a permanent magnetization and has a magnetic axis as indicated by the line NS.
  • FIG. 2 of the drawings it can be seen that when the ferrite ring 4 has its magnetic axis coincident with the plane passing through the relay terminals 2 and 3, the flux generated by the ferrite ring and the coil 5, when energized, are in aiding relationship. With the ring 4 in this position, the relay will operate in re- Ponse to a small amo nt of current through coil 5.
  • FIG. 4 illustrates the ferrite ring 4 having its magnetic axis placed in an intermediate position between 0- and degrees with respect to a plane passing through the terminals 2 and 3.
  • the value of the magnetic flux appearing on the contact arms of the relay is dependent on the particular angle of the magnetic axis with respect to the plane of the terminals.
  • the sensitivity of the relays can be altered from one extreme to the other by rotating the ferrite ring about the terminals 2 and 3.
  • One such extreme is one in which the resultant magnetic flux is the combination of the flux from the ferrite ring and from the energizing winding.
  • the other extreme is one wherein the sensitivity of the relay is controlled solely by the flux generated by the magnetic winding. Therefore, memory functions can be obtained by merely positioning the magnetic axis of the ferrite ring in the various positions. Additional functions can be obtained by varying the current through the operating windings in combination with the rotational positioning of the ferrite ring.
  • a magnetically operated switch structure comprising a pair of spaced parallel bars of magnetic material each having a contact portion associated therewith, said contact portions being positioned in flux linking relationship with each other, one of said contact portions being movable to make and break an electrical connection between said bars, an enclosing envelope within which the said contact portions of said bars are enclosed with the remainder of said bars extending externally out of one end of said envelope and sealed therethro ugh in a vacuumtight manner, adjustable permanent magnet means comprising a ferrite annulus associated with the said external portion of said bars, and a flux generating winding associated with the said contact portion of said bars, the said movement of the contact portion of said bars being jointly controlled by said permanent magnet means and said flux generating winding means.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Electromagnets (AREA)
  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Contacts (AREA)
  • Arc-Extinguishing Devices That Are Switches (AREA)
US201872A 1960-12-09 1962-06-12 Reed-relay with adjustable ferrite element Expired - Lifetime US3214533A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2121060 1960-12-09
IT1107661 1961-06-16

Publications (1)

Publication Number Publication Date
US3214533A true US3214533A (en) 1965-10-26

Family

ID=26326371

Family Applications (1)

Application Number Title Priority Date Filing Date
US201872A Expired - Lifetime US3214533A (en) 1960-12-09 1962-06-12 Reed-relay with adjustable ferrite element

Country Status (5)

Country Link
US (1) US3214533A (en))
CH (1) CH399592A (en))
DE (3) DE1190573B (en))
GB (2) GB957454A (en))
NL (1) NL279334A (en))

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3522563A (en) * 1968-01-08 1970-08-04 Telephone Mfg Co Ltd Polarized mercury-wetted reed-relay

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1280412B (de) * 1965-05-20 1968-10-17 Standard Elektrik Lorenz Ag Bistabil arbeitendes Relais mit Schutzrohrankerkontakten

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2907846A (en) * 1957-09-17 1959-10-06 Siemens Ag Polarized switching contact device
US2916585A (en) * 1957-06-20 1959-12-08 David F Moyer Switch assembly
US2999915A (en) * 1956-12-21 1961-09-12 Siemens Ag Polarized change-over contact device
US3046370A (en) * 1959-10-30 1962-07-24 Gen Electric Electromagnetic relay
US3059074A (en) * 1957-04-09 1962-10-16 Int Standard Electric Corp Electrical switching device and method for making

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2999915A (en) * 1956-12-21 1961-09-12 Siemens Ag Polarized change-over contact device
US3059074A (en) * 1957-04-09 1962-10-16 Int Standard Electric Corp Electrical switching device and method for making
US2916585A (en) * 1957-06-20 1959-12-08 David F Moyer Switch assembly
US2907846A (en) * 1957-09-17 1959-10-06 Siemens Ag Polarized switching contact device
US3046370A (en) * 1959-10-30 1962-07-24 Gen Electric Electromagnetic relay

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3522563A (en) * 1968-01-08 1970-08-04 Telephone Mfg Co Ltd Polarized mercury-wetted reed-relay

Also Published As

Publication number Publication date
GB946628A (en) 1964-01-15
GB957454A (en) 1964-05-06
DE1250555B (en)) 1967-09-21
CH399592A (de) 1965-09-30
DE1194031B (de) 1965-06-03
NL279334A (en))
DE1190573B (de) 1965-04-08

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