US3492613A - Reed relays having aiding coils to couple highly inductive operating coils to reed blades - Google Patents

Reed relays having aiding coils to couple highly inductive operating coils to reed blades Download PDF

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Publication number
US3492613A
US3492613A US660481A US3492613DA US3492613A US 3492613 A US3492613 A US 3492613A US 660481 A US660481 A US 660481A US 3492613D A US3492613D A US 3492613DA US 3492613 A US3492613 A US 3492613A
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Prior art keywords
reed
relay
coils
operating
coil
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Expired - Lifetime
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US660481A
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English (en)
Inventor
Hendrik W Van Husen
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Automatic Electric Laboratories Inc
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Automatic Electric Laboratories Inc
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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
    • H01H51/281—Mounting of the relay; Encapsulating; Details of connections

Definitions

  • the in ductance of the relay is kept to a minimum; however, in some cases, notably in certain communications applications, for example, as in the case of a batter feed device of a telephone system, such as disclosed in US. Patent 3,293,368, a high inductance condition is desirable.
  • this invention provides a reed relay of the type described which avoids the problem of the reed switch contacts thereof, once operated to a closed condition from remaining in said condition upon the deenergization of the operatnig coil.
  • the invention also provides a reed relay of the above type in which, by means of the utilization of the change in the magnetic field occurring in the relay upon the energization or deenergization of the operating coil, the operating characteristics may be modified.
  • the invention further provide a reed relay of the above type which may be advantageously used as a battery-feed relay of a telephone, or similar system.
  • a preferred embodiment of the reed relay comprises a U-shaped iron core, the ends of which are adjacent a reed switch or switches.
  • a second winding In addition to the usual operating coil wound about the core, there is also wound thereabout a second winding. A tertiary portion of this second winding is wound, in a predetermined sense; i.e., either in aiding or opposing relation to the operating winding, about the reed switch or switches.
  • a short surge of voltage is induced in the second winding to apply a resulting momentary magnetic flux through the tertiary portion thereof, to the reed switch or switches, which in turn, depending upon the manner in which the second winding is wound about both the switches and core, will either act to boost the action of the operating coil or opposed the action thereof, thus causing the reeds either to open or to close more rapidly or more slowly as the case may be.
  • FIG. 1 is a schematic representation of a reed relay according tothe invention, which serves to illustrate, in a simple manner, the principle upon which the invention is based;
  • FIG. 2 is a perspective view of a preferred, practical embodiment of a reed relay according to the invention which may be used as a battery feed relay of a telephone system;
  • FIG. 3 is also a perspective view of the reed relay of FIG. 2 with single turn windings being substituted for the coils shown in FIG. 2, so as to better described the construction of the relay.
  • a prefered embodiment of the reed relay comprises a U-shaped iron core 10 having bight portion 11 and legs 12 and 13. Adjacent the ends 14 and 15 of legs 12 and 13, respectively, is located a reed switch device 16.
  • the reed switch device is of the usual type including a pair of magnetic reed blades 17 and 18, which when subjected to a magnetic field, close to complete an external circuit (not shown) connected thereto.
  • the blades as can be seen, are sealed into a closed, insulated chamber 19, normally constructed of a vitreous material.
  • the U-shaped core shown in the drawings is not essential to the invention; however, it is preferred because it provides a better concentration of the magnetic operating field at the reed switch than does a conventional parallel, straight-line core.
  • An operating coil 20 is wound about the bight portion of iron core 10, which when energized by means of battery 21 upon depression of switch 22, serves to produce, through iron core 10, the necessary magnetic field to operate the reed switch 16.
  • additional coil 23 which serves as a magnetic coupling means is wound about both the reed switch 16 and the iron core 10, shown here on the bight portion 11, such that upon the energization or deenergization of coil 20', a change in the magnetic field of core results, which in turn, causes a voltage to b induced into portion 24 of the coil 23. This induced voltage causes current to fiow in coil 23 which produces a momentary magnetic field at the tertiary portion 25 there of, wound about the reed switch 16.
  • the magnetic energy from this momentary field or flux either aids or opposes the operating magnetic field created upon the energization of operating coil 20.
  • the induced momentary magnetic field will cause the reed switch 16 to close more quickly and positively.
  • FIG. 2 illustrates an embodiment of a relay according to the invention designed primarily for use as a battery feed relay of a telephone system.
  • a battery feed relay supplies talking battery to the subscriber station of the telephone exchange.
  • the relay should maintain the talking or voice frequency on the telephone line, and the noise, if any, in the battery.
  • the windings of the battery feed relay should be balanced electrically, thus reducing pick up of extraneous voltages to which a telephone line might be exposed.
  • the relay of course may be used in other applications as desired.
  • FIG. 2 comprises a U-shaped, laminated iron core 50, best seen in FIG. 3 of the drawings.
  • the outer laminations of each of the legs 51 and 52 of the core extend beyond the other laminations thereof to provide support for the reed switch device 53, in its specially designed holder 54 in the magnetic operating field of the relay.
  • three coils 56, 57 and 58 are each wound on a respective bobbin 59, 60 and 61, the latter two being fabricated so as to slide over the legs of the U-shaped core into a mounted position on bight portion 62.
  • Bobbin 59 which is supported between the core' legs 51 and 52, has a pair of protrusions 63 and 64 which extend in opposite directions as shown.
  • Protrusion 64 has mounted thereon terminals 69 which are used to connect the reed switch via holder 54 to an external circuit (not shown).
  • Bobbins 59, 60 and 61 are preferably constructed of a molded plastic.
  • Each of the bobbins 57 and 58 has a pair of legs 65, 66 and 67, 68, respectively, extending downward and having terminals such as 69 mounted thereon. Through these terminals, coils 56, 57, 58 are interconnected by means of wires such as 70 in the manner illustrated in FIG. 3. by single windings 80, 81 and 82.
  • operating coil 80 is wound partially about both legs 51 and 52 of the iron core. With each portion of the operating coil, there is, as shown in FIG. 3, concentrically wound, a portion of the secondary winding 81.
  • winding 56 of FIG. 2 corresponds to tertiary portion 82 of winding 81 of FIG. 3.
  • Approximately one-half of secondary winding 81 and one-half of operating winding are concentrically wound about leg 52 of the core in FIG. 3 and correspond to coil 57 of FIG. 2, and likewise approximately one-half of secondary winding 81 and onehalf of operating winding 80 are concentrically wound about the core leg 51 of FIG. 3 and correspond to coil 58 of FIG. 2.
  • the coils 56, 57 and 58 of FIG. 2 have been superimposed in dotted lines in FIG. 3 to further describe their relation to windings 80 and 81 of FIG. 3.
  • the entire relay when completely assembled is placed in a housing 55 shown in dotted lines in FIG. 2.
  • the housing preferably is constructed of a metallic material for magnetic shielding purposes, but could be of a difiFerent material if desired.
  • the housing 55 includes a cover portion having tabs such as 92 with apertures therethrough for mounting the entire relay structure to a support surface, such as printed circuit card (not shown).
  • a base plate portion (not shown) is fitted to cover portion 90 to completely enclose the relay structure.
  • the operation of the relay of FIGS. 2 and 3 is like that of the relay of FIG. 1.
  • battery 99 supplies current which passes through coil 80, here in a direction from point 1 to 8 thereof.
  • a current is induced in winding 81 in a direction from point 9 to 14 thereof.
  • the current in winding 81 creates a momentary magnetic field in tertiary portion 82 about reed switch 53 which, because of the manner in which the winding 81 is wound about the reed switch and core, assists the magnetic operating field, and causes the reed blades to close positively and rapidly.
  • the instant invention provides a relay of the high inductance type, using a coil wound iron core as the operating medium, which not only is free from the drawbacks frequently present with such a relay, but in addition, is capable of having the operation thereof modified so as to suit the particular environment and function in which, and for which, it might be used.
  • said magnetic switching element conducting a sufiicient portion of the magnetic flux resulting from energization of said operating winding to cause operation of the switching element
  • an additional coil electromagnetically coupled to said core structure and to said magnetic switching element, magnetic energy being coupled from said core to said switching element to modify the amount of magnetic flux through said switching element according to the sense of said coil in response to changing current in said operating winding, whereby the operating characteristic of said switching element is modified by the electromagnetic coupling of said additional coil.
  • said magnetic switching element is a reed switch having blades of mag netic material, said blades having free ends overlapping to form a pair of contacts, and said additional coil being closely magnetically coupled to said contacts.
  • a relay according to claim 2 wherein said core structure is substantially U-shaped said additional coil having a first portion encircling said contacts of said switching element and a second portion wound on said cover structure, said first and second portions being interconnected in a series closed circuit.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
US660481A 1967-08-14 1967-08-14 Reed relays having aiding coils to couple highly inductive operating coils to reed blades Expired - Lifetime US3492613A (en)

Applications Claiming Priority (1)

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US66048167A 1967-08-14 1967-08-14

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US3492613A true US3492613A (en) 1970-01-27

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BE (1) BE719251A (OSRAM)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560804A (en) * 1969-07-14 1971-02-02 Automatic Elect Lab Battery-feed and impulsing circuit using a fast-operating relay
US3605049A (en) * 1970-01-12 1971-09-14 Allen Bradley Co Sealed contact relay
US4237345A (en) * 1979-01-15 1980-12-02 Trw Inc. Transformer with integral reed contact
US5426698A (en) * 1993-05-11 1995-06-20 General Datacomm, Inc. Transformed current sensing relay for use in switched network modems and circuit incorporating same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985733A (en) * 1959-02-19 1961-05-23 Bell Telephone Labor Inc High leakage resistance electromagnetic relay
US3174008A (en) * 1962-08-15 1965-03-16 North Electric Co Reed switch adjustment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2985733A (en) * 1959-02-19 1961-05-23 Bell Telephone Labor Inc High leakage resistance electromagnetic relay
US3174008A (en) * 1962-08-15 1965-03-16 North Electric Co Reed switch adjustment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3560804A (en) * 1969-07-14 1971-02-02 Automatic Elect Lab Battery-feed and impulsing circuit using a fast-operating relay
US3605049A (en) * 1970-01-12 1971-09-14 Allen Bradley Co Sealed contact relay
US4237345A (en) * 1979-01-15 1980-12-02 Trw Inc. Transformer with integral reed contact
US5426698A (en) * 1993-05-11 1995-06-20 General Datacomm, Inc. Transformed current sensing relay for use in switched network modems and circuit incorporating same

Also Published As

Publication number Publication date
BE719251A (OSRAM) 1969-02-10

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