US3569890A - Bistable magnetic latching relay - Google Patents

Bistable magnetic latching relay Download PDF

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Publication number
US3569890A
US3569890A US787004A US3569890DA US3569890A US 3569890 A US3569890 A US 3569890A US 787004 A US787004 A US 787004A US 3569890D A US3569890D A US 3569890DA US 3569890 A US3569890 A US 3569890A
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United States
Prior art keywords
armature
core
permanent magnet
face
relay
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
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US787004A
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English (en)
Inventor
Ezio Barateili
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Individual
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Individual
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Publication of US3569890A publication Critical patent/US3569890A/en
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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
    • H01H51/2236—Polarised relays comprising pivotable armature, pivoting at extremity or bending point of armature

Definitions

  • the relay includes further an 229, 253,254, 128 (Gummy) annular permanent magnet, surrounding the end portion of the core on which the end face cooperating with the armature [56] References Cited is provided, to keep the armature, when brought to the closed UNITED STATES PATENTS position by energizing the one winding, in said closed position 2,81 1,601 10/1957 Somers 335/170 even after the one winding is deenergized.
  • This invention relates to a bistable magnetic latching relay of a type employing a mobile armature kept in stable attracted position also after the power of the excitation coil has been removed, by means of a proper magnetic-latching field and is released only by the excitation of an auxiliary coil generating a magnetic field reverse to the latching field.
  • the first type employs a magnetic core saturated by the excitation of a tripping coil, apt to keep a residual magnetism which is great enough to hold the armature in stable latching position against the reset springs, also after the excitation of the coil has been finished.
  • the release of the armature is achieved by generating (by means of an auxiliary coil) a magnetic field which is reversed to the residual one.
  • the second type employs a permanent magnet placed near the end of the core which has the greatest distance from the useful gap with regard to the armature. This permanent magforming the useful gap and which is designed to rest on the core, and a secondary surface which is attracted by the permanent magnet in the open armature position.
  • the main circuit involves the permanent magnet, the core and the armature.
  • This invention relates to a bistable latching relay employing a permanent magnet placed on the end of the core next to the latching surface of the armature while the latter has a simple shape.
  • the permanent magnet has a latching force which allows not to attract the armature when it is open, but to keep it stably closed when the armature has been brought in closed position through the excitation of the main tripping coil, while a secondary coil generates a magnetic field reverse to the field of the core in order to allow that the reset springs reset the armature in the open position.
  • the end of the electromagnets core upon which the armature drops projects by a predetermined length beyond the coil.
  • the permanent magnet is placed on this end and takes a ring shape with a prefixed polarity.
  • the end of the core projects beyond this electromagnet for a length sufficient to allow the armature to rest on it.
  • the first advantage offered by this invention is that the presence of the permanent magnet in the proximity of the armature does not require a perfect fitting between the surface in contact with the armature and the end of the core and therefore eliminates the necessity of precision manufacture.
  • An additional advantage is that the presence of a little residual magnetism of the core does not impair operation of the relay, on the contrary it is possible to exploit ad-' vantageously the sum hole the magnetic field of this residual magnetism and of the magnetic field of the permanent magnet to keep the armature latched; this allows to use a weak per manent magnet and to use for the core a less expensive materi al thus realizing a magnetic-latching relay at low cost and easy to produce while maintaining unaltered the requirements of a safe and stable latching of the armature.
  • the invention is illustrated as a not limiting example of a constructive form in the FIGURE of the drawing showing in enlarged scale a longitudinal cross section of the relay.
  • the relay which is object of the invention, consists of a double winding comprising a main coil of excitation 1 and an auxiliary coil 2 for the demagnetization. These windings are wound on a sleeve 3 limited at the two ends by two flangest4 and 5 and sleeve 3 houses in its cylindrical portion the magnetic core 6 which is of a material apt to keep a little residual magnetism.
  • This core is fixed to the bent surface 7 of a yoke or L-shaped member with a fixing screw 9 passing through the mentioned part 7 and threading into a blind, threaded hole of the core. Between the support 7 and the adjacent core is placed a washer 10 serving to keep the core 6 in a fixed axial position with regard to the sleeve 3.
  • the core 6 is longer than the sleeve and its free end 6' projects beyond the side 5 by a predetermined length, as explained below. 7
  • a permanent ring-shaped magnet" ll having an internal diameter which is larger than the diameter of the core 6, is placed about the end 6' so that there is left a ring-shaped gap which may be filled with a nonmagnetic material, for instance a ring 12 of plastic material.
  • the permanent magnet preferably is made of plastic bonded ferrite, so that besides having good magnetic properties it may be produced at low cost.
  • the core 6 projects beyond said permanent magnet 11 for a small step 13, so that its plane end face provides a suitable support for the mobile armature l4.
  • the mobile armature 14 has the shape of a bent arm and its elbow 15 is fulcrummed on the bottom of a clevis 16 obtained from the yoke 8.
  • a blade spring 17 exercises a pressure on the armature compelling the latter against its fulcrum.
  • a branch 14' of the armature 14 support a pressure member 18 allowing to move the elasticrblades 19 carrying the mobile contacts towards the fixed blades 20 carrying the fixed contacts and aligned by rigid supports 21.
  • the elastic blades 19 form also the reset spring of the mobile armature l4.
  • a base 22 of insulating material shaped to show a seat 23 for the engagement of the yoke 8, and the seats 24 and 25 in which are fixed the supports 26 and 21 of the contacts 19 and 20.
  • the fixing is done by means of the screws 27 and 28 which reach to outside grooves respectively 29 and 30 of the base to support the terminals 31 and 32 to which arrive the electrical contacts connected to the contacts and which are clamped by the screws 33 and 34 respectively.
  • the alignment with the core 6 and the base 22 shows a groove 35 in which enters the spring 17, while its end is engaged between the raised wall 36 and the opposite side 37 formed by the same groove 35.
  • the terminals 38 equipped with fixing screws 39 serve for the connection of the line conductors of the winding by means of the screws 40 and conducting plates 41.
  • a housing 42 serves to cover the base and all the components standing on the latter, however, without supporting the components themselves.
  • the relay operates as follows:
  • the core 6 attracts the armature 14 which comes to rest on the plane end 6" of the core.
  • the armature stays attracted by the permanent magnet 11 while its lines of force pass mostly through the armature itself.
  • this magnetism is added to that of the permanent magnet thereby contributing to a rise the attraction force on said armature.
  • the gap 12 between the magnet 11 and the core 6 serves to avoid that the lines of force of this permanent magnet close directly on the core, but are compelled to pass through the armature 14.
  • a magneticlatching relay which is maintained stable in closed as well as in open position and comprising a core having an end face and being formed from magnetizable material; an armature located adjacent said end face movable between an open position spaced from said one end face and a closed position engaging the same; a main winding about said core for generating, when energized, a magnetic field which moves said armature to said closed position; an auxiliary winding about said core for generating, when energized, a magnetic field opposite to the field generated by said main winding, said core having at said one end face an end portion projecting beyond said windings; and a ring-shaped permanent magnet surrounding said end face of said core radially spaced therefrom to define an annular gap between said core and said permanent magnet, said permanent magnet producing a magnetic field in the same direction as the main winding so that said armature, after being moved by energizing said main winding to said closed position, will be directly attracted by said permanent magnet and stay in said close position after said main winding

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)
US787004A 1967-12-29 1968-12-26 Bistable magnetic latching relay Expired - Lifetime US3569890A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2451767 1967-12-29
IT826267 1967-12-29

Publications (1)

Publication Number Publication Date
US3569890A true US3569890A (en) 1971-03-09

Family

ID=26326017

Family Applications (1)

Application Number Title Priority Date Filing Date
US787004A Expired - Lifetime US3569890A (en) 1967-12-29 1968-12-26 Bistable magnetic latching relay

Country Status (9)

Country Link
US (1) US3569890A (de)
AT (1) AT288523B (de)
BE (1) BE726170A (de)
CH (1) CH468072A (de)
DE (1) DE1800088B1 (de)
FR (1) FR1556800A (de)
GB (1) GB1201229A (de)
NL (1) NL6813090A (de)
SE (1) SE356394B (de)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747035A (en) * 1971-04-21 1973-07-17 Matsushita Electric Works Ltd Electromagnetic relay
WO1981001626A1 (en) * 1979-12-03 1981-06-11 M Gottschall A two position mechanism
US20020118057A1 (en) * 1999-08-31 2002-08-29 Leonard Forbes Integrated circuit and method for minimizing clock skews
US20040148942A1 (en) * 2003-01-31 2004-08-05 Capstone Turbine Corporation Method for catalytic combustion in a gas- turbine engine, and applications thereof
US20060219497A1 (en) * 2005-03-30 2006-10-05 Organek Gregory J Residual magnetic devices and methods
US20060219499A1 (en) * 2005-03-30 2006-10-05 Organek Gregory J Residual magnetic devices and methods
US20060219513A1 (en) * 2005-03-30 2006-10-05 Organek Gregory J Residual magnetic devices and methods
US20060219496A1 (en) * 2005-03-30 2006-10-05 Dimig Steven J Residual magnetic devices and methods
US20060219498A1 (en) * 2005-03-30 2006-10-05 Organek Gregory J Residual magnetic devices and methods
US20060226941A1 (en) * 2005-03-30 2006-10-12 Dimig Steven J Residual magnetic devices and methods
US20060227488A1 (en) * 2005-03-30 2006-10-12 Dimig Steven J Residual magnetic devices and methods
US20060225985A1 (en) * 2005-03-30 2006-10-12 Dimig Steven J Residual magnetic devices and methods
US20060226942A1 (en) * 2005-03-30 2006-10-12 Dimig Steven J Residual magnetic devices and methods
US20060237959A1 (en) * 2005-03-30 2006-10-26 Dimig Steven J Residual magnetic devices and methods
US20060238285A1 (en) * 2005-03-30 2006-10-26 Dimig Steven J Residual magnetic devices and methods
US20060238284A1 (en) * 2005-03-30 2006-10-26 Dimig Steven J Residual magnetic devices and methods
US7401483B2 (en) 2005-03-30 2008-07-22 Strattec Security Corporation Residual magnetic devices and methods for an ignition actuation blockage device
US7474183B2 (en) * 2001-09-24 2009-01-06 Siemnes Energy & Automation, Inc. System and method for latching magnetic operator device
US20140055223A1 (en) * 2012-08-24 2014-02-27 Omron Corporation Electromagnet device, method of assembling the same, and electromagnetic relay using the same
IT201800004850A1 (it) * 2018-04-24 2019-10-24 Rele' per sistemi a sicurezza intrinseca

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2905498C2 (de) * 1979-02-14 1986-10-09 Standard Elektrik Lorenz Ag, 7000 Stuttgart Miniaturrelais
FR2514554A1 (fr) * 1981-06-02 1983-04-15 Servo Contact Relais electromagnetique bistable
DE29916233U1 (de) 1999-09-15 2001-01-25 Schaltbau AG, 81677 München Bistabiles Schütz

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811601A (en) * 1955-03-28 1957-10-29 Gen Electric Latching relay
US3076880A (en) * 1960-04-19 1963-02-05 Clare & Co C P Relay
US3153178A (en) * 1959-12-14 1964-10-13 Cons Electrics Ind Corp Magnetic lock-up relay
GB983303A (en) * 1961-06-27 1965-02-17 Westinghouse Brake & Signal Electrical relays

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE551075A (de) * 1955-09-16

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2811601A (en) * 1955-03-28 1957-10-29 Gen Electric Latching relay
US3153178A (en) * 1959-12-14 1964-10-13 Cons Electrics Ind Corp Magnetic lock-up relay
US3076880A (en) * 1960-04-19 1963-02-05 Clare & Co C P Relay
GB983303A (en) * 1961-06-27 1965-02-17 Westinghouse Brake & Signal Electrical relays

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3747035A (en) * 1971-04-21 1973-07-17 Matsushita Electric Works Ltd Electromagnetic relay
WO1981001626A1 (en) * 1979-12-03 1981-06-11 M Gottschall A two position mechanism
US4749167A (en) * 1979-12-03 1988-06-07 Martin Gottschall Two position mechanism
US20020118057A1 (en) * 1999-08-31 2002-08-29 Leonard Forbes Integrated circuit and method for minimizing clock skews
US7474183B2 (en) * 2001-09-24 2009-01-06 Siemnes Energy & Automation, Inc. System and method for latching magnetic operator device
US20040148942A1 (en) * 2003-01-31 2004-08-05 Capstone Turbine Corporation Method for catalytic combustion in a gas- turbine engine, and applications thereof
US20060219499A1 (en) * 2005-03-30 2006-10-05 Organek Gregory J Residual magnetic devices and methods
US20060238285A1 (en) * 2005-03-30 2006-10-26 Dimig Steven J Residual magnetic devices and methods
US20060219496A1 (en) * 2005-03-30 2006-10-05 Dimig Steven J Residual magnetic devices and methods
US20060219498A1 (en) * 2005-03-30 2006-10-05 Organek Gregory J Residual magnetic devices and methods
US20060226941A1 (en) * 2005-03-30 2006-10-12 Dimig Steven J Residual magnetic devices and methods
US20060227488A1 (en) * 2005-03-30 2006-10-12 Dimig Steven J Residual magnetic devices and methods
US20060225985A1 (en) * 2005-03-30 2006-10-12 Dimig Steven J Residual magnetic devices and methods
US20060226942A1 (en) * 2005-03-30 2006-10-12 Dimig Steven J Residual magnetic devices and methods
US20060237959A1 (en) * 2005-03-30 2006-10-26 Dimig Steven J Residual magnetic devices and methods
US20060219513A1 (en) * 2005-03-30 2006-10-05 Organek Gregory J Residual magnetic devices and methods
US20060238284A1 (en) * 2005-03-30 2006-10-26 Dimig Steven J Residual magnetic devices and methods
US7401483B2 (en) 2005-03-30 2008-07-22 Strattec Security Corporation Residual magnetic devices and methods for an ignition actuation blockage device
US20060219497A1 (en) * 2005-03-30 2006-10-05 Organek Gregory J Residual magnetic devices and methods
US7969705B2 (en) 2005-03-30 2011-06-28 Strattec Security Corporation Residual magnetic devices and methods
US8149557B2 (en) 2005-03-30 2012-04-03 Strattec Security Corporation Residual magnetic devices and methods
US8403124B2 (en) 2005-03-30 2013-03-26 Strattec Security Corporation Residual magnetic devices and methods
US10290411B2 (en) 2005-03-30 2019-05-14 Strattec Security Corporation Residual magnetic devices and methods
US9070501B2 (en) * 2012-08-24 2015-06-30 Omron Corporation Electromagnet device, method of assembling the same, and electromagnetic relay using the same
US20140055223A1 (en) * 2012-08-24 2014-02-27 Omron Corporation Electromagnet device, method of assembling the same, and electromagnetic relay using the same
IT201800004850A1 (it) * 2018-04-24 2019-10-24 Rele' per sistemi a sicurezza intrinseca

Also Published As

Publication number Publication date
CH468072A (it) 1969-01-31
BE726170A (de) 1969-05-29
SE356394B (de) 1973-05-21
NL6813090A (de) 1969-07-01
AT288523B (de) 1971-03-10
GB1201229A (en) 1970-08-05
DE1800088B1 (de) 1970-11-12
FR1556800A (de) 1969-02-07

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