US2928915A - Arrangement in polarized relays - Google Patents

Arrangement in polarized relays Download PDF

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Publication number
US2928915A
US2928915A US590223A US59022356A US2928915A US 2928915 A US2928915 A US 2928915A US 590223 A US590223 A US 590223A US 59022356 A US59022356 A US 59022356A US 2928915 A US2928915 A US 2928915A
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United States
Prior art keywords
contact
armature
springs
spring
travel
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Expired - Lifetime
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US590223A
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English (en)
Inventor
Vigren Sten Daniel
Zander Rolf Albin
Claesson Per Harry Elias
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays
    • H01H51/2272—Polarised relays comprising rockable armature, rocking movement around central axis parallel to the main plane of the armature
    • H01H51/2281—Contacts rigidly combined with armature

Definitions

  • the present invention relates to an arrangement in polarized relays and has for its object to provide a relay in which the wear of the contact system of the relay is less than in hitherto known relays of this type.
  • the invention is foremost characterised by the fact that the armature of the relay at least in one of its operated positions withholds at least one movable contact spring so that it is not in contact with the corresponding stationary spring. Furthermore the travel. of the contactoperating part of the armature is larger than the travel of that part of the armature which moves in the magnet air gap, the travel ratio being at least two, and preferably at least four.
  • the armature can also be balanced with respect to its pivotal axis" so that the operation of the" relay will not be affected by accelerations or retardations to which the relay may be subjected.
  • the contact travel isrelatively short. Even though this invention has for its purpose to provide a larger contact separation than in prior relays, the contact movements will be relatively small, of the order 0.1 millimetre in the most sensitive relays. This means that the length and the mass of the contact springs can be reduced. Thus the free length of the movable contact springs may be as small as. a few millimetres. in-the case that the movable contact springs are made of beryllium: bronze, steel or platinunniridium (about 80% P-t and 29% lr),the free length of, thespring can be made about-7 millimetres at a width of. 3.
  • Figure 5 shows another embodiment having springs of strip material.
  • FIGS 6 to 9 show still another embodiment of the invention having contact springs of wire material.
  • Figures 11 and 11a show various dimensions used in an illustrative example
  • Figure 12 is a diagram relating to this example.
  • the arm 3 of the armature is preferably made of sheet metal, e.g. of the aluminum alloy known in the trade as Duralumin, having a thickness of e.g. 0.2 millimetre, and has been stiffened by means of flanges as shown in Figure 1a.
  • the contact spring set consists of two movable side springs 15 and 16 and a central spring 14.
  • the central spring 14 should be considerably stiller than the side springs, and at least at its upper end it should have a larger mass than the side springs. Therefore the central spring should be made of thicker material than the side springs.
  • the central spring At its free end the central spring is provided with a contact 26 which increases the mass and also defines a distance between the side springs.
  • the contact-operating end of the armature is provided with a stud 17 of insulating material, e.g. nylon or Perlon. The size of stud 17 is suitably adapted to the distance between the side springs.
  • the contact springs 14 to 16 can be made of either strip material or Wire material. If wire material is used, the central spring is preferably bent at angles as will be described later with reference to Figures 9 and 10.
  • the contact springs 14 to 16 which may be provided with soldering lugs, are preferably fastened to a plate "11 of insulating material by e.g. moulding or fitting into grooves.
  • the said plate is preferably displ'aceably mounted on the bridge 5 and is fixed by means of two screws l2 and 13, since if the plate 11 is displaceable, the position of the contact springs can easily be adjusted with respect to the neutral central position of the armature.
  • FIGS 3 and 4 the construction of the contact springs 14 to 2.6 which are made of strip material, is illustrated more in detail.
  • the contact springs are clamped between two clamping members 18 and 19 by means of screws 2b and 21.
  • the springs are insulated from each other in any known manner.
  • the clamping" members are also provided with two adjusting screws 22' and 23 for limiting the armature travel.
  • the insulating stud 17 on the armature has the shape of a peg, and the stationary contact spring has been divided into two springs 14a and lab.
  • FIGS 6 to 8 show an embodiment of the invention in which wire springs are employed.
  • the various parts are designated by the same numerals as the corresponding parts in the previous figures.
  • the contact spring wires 14a, 14b, 15 and 16 are bent in U- shape about a tube 24 of insulating material. Furtherclamping means 18 and 19 by means of spacing washers 25 and a screw 20. Those ends of the contact spring wires which do not serve as contacts, can be used as soldering lugs.
  • the movable contact springs can be bent instead of the stationary springs, in which case the stud 17 on the armature should preferably have its main extension in a direction at right angles to the plane of the relay bridge 5.
  • the dimensioning of the long arm of the armature will now be illustrated by a simple example of computation. It will be assumed that the armature has dimensions indicated in Figure 11 wherein all measures are in centimetres.
  • the length of the long arm of the armature is to be computed for a minimum operating time t.
  • the operating force is assumed to be constant.
  • the long arm of the armature has the length a and is assumed to be made of Duralumin having a specific gravity of 2.3, while the short arm of the armature is made of iron having a specific gravity of 8.3.
  • a polarized relay comprising an electromagnet, an armature of rigid magnetic material mounted for movement about a pivot axis, fixed means for producing a permanent magnetic flux in the armature, and contact means, said armature being balanced with respect to its pivotal axis and arranged to assume either of two dis tinct positions and having one end located adjacent to poles of the electromagnet and its other end located adjacent to said contact means, said contact means comprising at least two movable contact springs which are biased to engage stationary contacts when in non-operated position, said other end of the armature having contact actuating means associated therewith for keeping either of the movable contact springs out of engagement with the mating stationary contact when the armature is in either of said two distinct positions.
  • a polarized relay comprising an electromagnet, an armature, means for producing a permanent magnetic flux in the armature, and contact means, said armature consisting of a two-armed lever having one arm longer than the other and being balanced with respect to its pivotal axis, the shorter arm of the armature being positioned adjacent to poles of said electromagnet, said longer arm consisting of a strip of sheet metal, the cross section of said strip having its largest extension in a plane at right angles to the pivotal axis of the armature, said contact means comprising at least two movable contact springs which are biased to engage stationary contacts when in non-operated position, said armature being arranged to assume either of two distinct positions, and the longer arm of the armature having associated therewith means for keeping either of the movable contact springs out of engagement with the mating stationary contact when the armature is in either of said two distinct positions.
  • a polarized relay comprising an electromagnet, an armature, means for producing a permanent magnetic flux in the armature, and contact means, said armature being arranged to assume either of two distinct positions and having one end located adjacent to poles of the electroinagnet and its other end located adiacent to the contact means, said contact means comprising two movable contact springs positioned on either side of a third contact spring and being biased toward said third contact spring, said two movable springs having a considerably less stiffness than the third spring, and said armature having associated therewith means for keeping either of said movable springs out of engagement with the third contact spring when the armature is in either of said distinct positions.
  • a polarized relay comprising an electromagnet, an armature, means for producing a permanent magnetic flux in said armature, and contact means, said armature being arranged to assume either of two distinct positions and having one end located adjacent to poles of the electromagnet and its other end located adjacent to said contact means, said contact means comprising two outer contact springs and a central contact spring, said outer contact springs being biased toward the central contact spring, the central contact spring having a contact member giving to the central spring a mass larger than that of any of the outer springs and defining a. spacing between the outer springs, the armature having a contact operating end located within said spacing to keep either of the outer springs out of engagement with said contact member when the armature is in either of said distinct positions.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Electromagnets (AREA)
US590223A 1955-06-11 1956-06-08 Arrangement in polarized relays Expired - Lifetime US2928915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE349004X 1955-06-11

Publications (1)

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US2928915A true US2928915A (en) 1960-03-15

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US590223A Expired - Lifetime US2928915A (en) 1955-06-11 1956-06-08 Arrangement in polarized relays

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US (1) US2928915A (enrdf_load_stackoverflow)
BE (1) BE548535A (enrdf_load_stackoverflow)
CH (1) CH349004A (enrdf_load_stackoverflow)
FR (1) FR1154178A (enrdf_load_stackoverflow)
GB (1) GB808142A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002074A (en) * 1959-06-08 1961-09-26 Daystrom Inc Relay contact system
US3043932A (en) * 1959-03-30 1962-07-10 Zenith Radio Corp Polarized relay
US3047691A (en) * 1959-07-21 1962-07-31 Zd Y Jana Svermy Built-up polarized relay
US3115562A (en) * 1960-10-21 1963-12-24 Airpax Electronies Inc Electromechanical chopper
US3128357A (en) * 1961-06-27 1964-04-07 Control Corp Polarized harmonic relay and method of operating same
US3477045A (en) * 1966-04-12 1969-11-04 Matsushita Electric Works Ltd Electromagnetic reversing relay

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE624612A (enrdf_load_stackoverflow) * 1961-11-10

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2241262A (en) * 1939-10-26 1941-05-06 Baker & Co Inc Electrical contact
US2526804A (en) * 1945-03-06 1950-10-24 Carpenter Rupert Evan Howard Electrical contact assembly
US2609462A (en) * 1948-11-29 1952-09-02 Shipton & Company Ltd E Polarized relay
US2614188A (en) * 1947-01-31 1952-10-14 Leeds & Northrup Co Vibratory type of synchronous converter
US2755346A (en) * 1950-09-19 1956-07-17 Charles P Fisher Sensitive relay
US2763740A (en) * 1952-03-04 1956-09-18 Cie Ind Des Telephones Oscillatory switch
US2769880A (en) * 1954-07-09 1956-11-06 Ericsson Telefon Ab L M Contact device for cross bar switches
US2785248A (en) * 1953-12-22 1957-03-12 Mallory & Co Inc P R Reed damped vibrator arm mechanism

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2241262A (en) * 1939-10-26 1941-05-06 Baker & Co Inc Electrical contact
US2526804A (en) * 1945-03-06 1950-10-24 Carpenter Rupert Evan Howard Electrical contact assembly
US2614188A (en) * 1947-01-31 1952-10-14 Leeds & Northrup Co Vibratory type of synchronous converter
US2609462A (en) * 1948-11-29 1952-09-02 Shipton & Company Ltd E Polarized relay
US2755346A (en) * 1950-09-19 1956-07-17 Charles P Fisher Sensitive relay
US2763740A (en) * 1952-03-04 1956-09-18 Cie Ind Des Telephones Oscillatory switch
US2785248A (en) * 1953-12-22 1957-03-12 Mallory & Co Inc P R Reed damped vibrator arm mechanism
US2769880A (en) * 1954-07-09 1956-11-06 Ericsson Telefon Ab L M Contact device for cross bar switches

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3043932A (en) * 1959-03-30 1962-07-10 Zenith Radio Corp Polarized relay
US3002074A (en) * 1959-06-08 1961-09-26 Daystrom Inc Relay contact system
US3047691A (en) * 1959-07-21 1962-07-31 Zd Y Jana Svermy Built-up polarized relay
US3115562A (en) * 1960-10-21 1963-12-24 Airpax Electronies Inc Electromechanical chopper
US3128357A (en) * 1961-06-27 1964-04-07 Control Corp Polarized harmonic relay and method of operating same
US3477045A (en) * 1966-04-12 1969-11-04 Matsushita Electric Works Ltd Electromagnetic reversing relay

Also Published As

Publication number Publication date
FR1154178A (fr) 1958-04-03
GB808142A (en) 1959-01-28
CH349004A (de) 1960-09-30
BE548535A (enrdf_load_stackoverflow)

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