US3334320A - Magnetic reed switches having minimum contact bounce - Google Patents

Magnetic reed switches having minimum contact bounce Download PDF

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Publication number
US3334320A
US3334320A US493657A US49365765A US3334320A US 3334320 A US3334320 A US 3334320A US 493657 A US493657 A US 493657A US 49365765 A US49365765 A US 49365765A US 3334320 A US3334320 A US 3334320A
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US
United States
Prior art keywords
reed
contact
reeds
contact part
engagement
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
US493657A
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English (en)
Inventor
Gerald F Frank
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US493657A priority Critical patent/US3334320A/en
Priority to GB36429/66A priority patent/GB1129357A/en
Priority to DE19661640179 priority patent/DE1640179A1/de
Priority to JP6519266A priority patent/JPS44258B1/ja
Priority to FR79132A priority patent/FR1498721A/fr
Priority to NL6614174A priority patent/NL6614174A/xx
Priority to CH1446066A priority patent/CH460126A/de
Application granted granted Critical
Publication of US3334320A publication Critical patent/US3334320A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01H51/287—Details of the shape of the contact springs
    • 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

  • reed switch commonly employed is a single throw reed switch comprising a sealed tube mounting therewithin a pair of deflectable electrically and magnetically conductive reeds which overlap in spaced relation. The reeds are moved into engagement in response to application of a suitable magnetic field thereto.
  • a reed switch is disclosed in U.S. Patent 2,289,830.
  • Reed switches of the double throw type are also in commercial use and include a sealed tube containing a pair of fixed electrically and magnetically conductive contacts and netically conductive reed having a contact portion located between and overlapping the fixed contacts.
  • a permanent magnet is provided to control movement of the reed relative to the fixed contacts, and application of a suitable additional magnetic flux source eflects movement of the reed into engagement with a selected one of the fixed contacts.
  • a very desirable switch of this type is disclosed in U.S. Patent 3,117,202.
  • a sealed magnetic reed switch including a sealed t-ube mounting at one end a magnetically and electrically conductive electrode having a terminal part outside the tube and a contact part within the tube for co-operation with an electrically and magnetically conductive deflectable reed assembly mounted by the tube at the other end thereof.
  • the electrode may be deflectable or rigid as desired.
  • the reed assembly includes a terminal part outside the tube and a contact part within the tube which is deflectable relative to the electrode in directions toward and away from the electrode.
  • the reed assembly is split from its free end along a plane which is perpendicular to the direction of deflection of the reed assembly to form a pair of reeds of substantially equal length and having substantially the same natural frequency of vibration.
  • the free ends of the two reeds are spaced from each other in the direction of deflection of the reed assembly and are in overlapping relation with the contact part of the electrode.
  • FIGURE 1 is a view with parts broken away and with parts shOWn in section of a sealed double throw reed switch constructed in accordance with the present invention showing the reed assembly in engagement with one fixed contact part;
  • FIGURE 2 is a View similar to FIGURE 1 showing the reed assembly in engagement with the other fixed contact part of the switch.
  • FIGURE 1 a sealed magnetic reed switch of the double throw type constructed according to the present invention.
  • the switch includes a generally cylindrical elongated tube 10 preferably formed of glass and sealed at its opposite ends to support and enclose parts of the switch mechanism.
  • a pair of electrodes formed of electrically and magnetically conductive material, such as a nickel-iron alloy, and designated generally by the numerals 11 and 12.
  • the electrodes 11 and 12 in the illustrated embodiment are rigidly mounted and are adapted for selective engagement by a defiectable magnetic reed assembly 13 of unique construction described hereinafter.
  • the electrode 11 is of two part construction including a flattened contact part 14 within the tube and having a flattened section 15 outside the tube.
  • the part 14 includes an intermediate cylindrical section which is sealed to the tube by any suitable glass to metal sealing process.
  • the section 15 supports a permanent magnet 16 which in turn supports the terminal part 17 of the electrode 11.
  • the part 17 may be secured to the magnet 16 and the magnet 16 may be secured to the section 15 as by welding.
  • the magnet 16 is preferably of cylindrical configuration having a high coercive force and may be formed of any suitable magnetic material, such as Alnico.
  • the magnet 16 is shown positioned externally of the tube 10 so that when magnetized its north and south poles designated N and S respectively are spaced longitudinally of the tube. If desired, the magnet 16 may be located within the tube as in the switch shown in FIGURE 1 of Patent 3,117,202.
  • the electrode 12 is of one piece construction including a flattened contact part 18 within the tube and a cylindrical terminal part 19 extending outside the tube.
  • the electrode 12 is sealed to the tube by any suitable glass to metal sealing process.
  • the contact parts 14 and 18 are spaced transversely of the longitudinal axis of the tube 10 to cooperate with the reed assembly 13.
  • the magnet 16 and the reed assembly 13 are included in series in a magnetic circuit which provides a path for magnetic flux emanating from the magnet 16.
  • the magnetic flux from magnet 16 is effective to attract the reed assembly 13 to the contact part 14 as shown in FIGURE 1.
  • a suitable additional magnetic field source illustrated in the form of a winding 20 surrounding the tube 10. It is understood that the additional field source may comprise other means such as a permanent magnet.
  • the reed assembly 13 is of split construction which is found to minimize bouncing of the reed assembly as it engages either of the contact parts 14 or 18.
  • the reed assembly 13 is split through a substantial portion of its length along a plane which is generally perpendicular to the path of deflection of the reed assembly and to the direction of spacing of the contact parts 14 and 18.
  • Such splitting of the reed assembly forms two reeds of substantially equal length with substantially the same natural frequency of vibration which cooperates to minimize contact bounce.
  • the split reed assembly comprises a first main deflectable reed 21 formed of electrically and magnetically conductive material and having a free end 22 within the tube and a terminal end 23 located externally of the tube.
  • the reed 21 is supported by the tube at the right hand end thereof as viewed in FIGURE 1 and extends longitudinally of the tube with the free end 22 between and in overlapping relation with the contact parts 14 and 18 and adjacent the contact part 14.
  • the reed 24 is preferably attached to the reed 21 by welding and lies tangent to the elastic curve of the reed 21 at the point of attachment thereto when the reed 21 engages the contact part 14.
  • the two reeds 21 and 24 Prior to magnetization of the magnet 16 the two reeds 21 and 24 extend midway between the contact parts 14 and 18 in spaced relation thereto with a slight spacing between the free ends 22 and 26 of the reeds.
  • the reeds 21 and 24 are deflectable relative to each other and the spacing between the free ends of the reeds increases slightly after magnetization of the magnet 16 and attraction of the reed 21 to the contact part 14.
  • Flux produced by such ener-gization of winding 20 also attracts the reed assembly toward the contact part 18 causing deflection of the reed 21 and movement of reed 24 so that the free end 26 of reed 24 engages the contact part 18.
  • the entire reed assembly 13 has certain kinetic energy which must be dissipated.
  • the reed 24 constitutes a beam which is simply supported at its free end by the contact part 18 and which may be considered to be clamped at its attached end to' the reed 21.
  • the portion of reed 21 from its point of attachment to reed 24 to its free end constitutes a clamped cantilever beam.
  • the reed 24 will vibrate considerably faster than the portion of the reed 21 from its area of attachment to its free end 22.
  • the reed 21 continues to move downwardly as viewed in FIGURE 1 due to its kinetic energy and thus applies an additional force to the reed 24 in the direction to increase the contact pressure.
  • Vibrations of the reed 24 are very quickly damped by engagement of the free end 22 of reed 21 with the free end 26 of reed 24.
  • a great part of the kinetic energy of the reed assembly is expended by such contact between the two reeds to thereby minimize contact bounce. Since the reed assembly is symmetrical, the same action will take place when it is moved away from the contact part 18 toward the contact part 14.
  • a reed switch comprising an electrically and magnetically conductive electrode having a terminal part and having a contact part, and an electrically and magnetically conductive deflectable reed assembly having a common terminal part, said reed assembly being deflectable along a path toward and away from said contact part, said reed assembly having only first and second reeds of substantially equal length, said first and second reeds having terminal ends supported in abutting relationship by said common terminal part, said first and second reeds extending from said common terminal part and overlying each other in a direction generally parallel to said path of deflection, said two reeds being deflectable relative to each other and having free contact ends spaced from each other in a direction generally parallel to said path of deflection and in overlapping relation with said contact part, said free contact end of said first'one of said reeds being moved into engagement with said contact part in response to deflection of said reed assembly toward said contact part resulting from application of an external magnetic
  • a reed switch comprising a sealed tube, a pair of electrically and magnetically conductive electrodes mounted by said tube having terminal parts outside the tube and having contact parts within the tube in spaced relation, an electrically and magnetically conductive deflectable reed assembly mounted Within said tube and having a common terminal part extending outside the tube, said reed assembly extending longitudinally of the tube between and in overlapping relation with the contact parts of said electrodes for deflection into and out of engagement with the contact parts, said reed assembly within said tube having only first and second reeds of substantially equal length, said first and second reeds having terminal ends supported in abutting relationship by said common terminal part, said first and second reeds extending from said common terminal part and overlying each other in a direction which is generally parallel to the direction of spacing of said contact parts, said two reeds being deflectable relative to each other and relative to said contact parts and having free contact ends spaced from each other in a direction parallel to the direction of spacing of said
  • a reed switch comprising a sealed tube, a pair of electrically and magnetically conductive electrodes mounted by said tube having terminal parts outside the tube and having contact parts within the tube in spaced relation, an electrically and magnetically conductive defiectable reed assembly mounted in said tube and having a terminal part outside the tube, said reed assembly extending longitudinally of the tube between and in overlapping relation with the contact parts of said electrodes for deflection into and out of engagement with the contact parts, said reed assembly having only a first reed mounted by said tube, and a second reed secured at one end to said first reed at an area spaced from the free end of said first reed, Said second reed being substantially tangent to the elastic curve of said first reed at the area where secured when said first reed engages its associated contact part, said first and second reeds being of substantially equal length and overlying each other in a direction which is generally parallel to the direction of spacing of said contact
  • a switch as defined in claim 8 have substantially the same natural bration.
  • a reed switch comprising an electrically and magnetically conductive electrode having a terminal part and having a contact part, and an electrically and magnetically conductive deflectable reed assembly having a terminal part, said reed assembly being deflectable along a path toward and away from said contact part, said reed assembly having only first and second reeds of substantially equal length and overlying each other in a direction generally parallel to said path of deflection, said reed assembly terminal part and said first reed being integrally formed, and said second reed being secured to said first reed at an area spaced from said terminal part, said second reed being substantially tangent to the elastic curve of said first reed at the area where secured when said first reed engages its associated contact part, said two reeds being deflectable relative to each other and having free contact ends spaced from each other in a direction generally parallel to said path of deflection and in overlapping relation with said contact part, said free contact end of
  • a reed switch comprising a sealed tube, a pair of electrically and magnetically conductive electrodes mounted by said tube having terminal parts outside the tube and having contact parts within the tube in spaced relation, an electrically and magnetically conductive deflectable reed assembly mounted in said tube and having a terminal part outside the tube, said reed assembly extending longitudinally of the tube between and in overlapping relation With the contact parts of said electrodes for deflection into and out of engagement with the contact parts, said reed assembly having only first and second reeds of substantially equal length and overlying each other in a direction which is generally parallel to the direction of spacing of said contact parts, said reed assembly terminal part and said first reed being integrally formed, and said second reed being secured to said first reed at an area spaced from said terminal part, said second reed being substantially tangent to the elastic curve of said first reed at the area where secured when said first reed engages its associated contact part, said two re

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
US493657A 1965-10-07 1965-10-07 Magnetic reed switches having minimum contact bounce Expired - Lifetime US3334320A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US493657A US3334320A (en) 1965-10-07 1965-10-07 Magnetic reed switches having minimum contact bounce
GB36429/66A GB1129357A (en) 1965-10-07 1966-08-15 Magnetic reed contact unit
DE19661640179 DE1640179A1 (de) 1965-10-07 1966-10-01 Magnetisch betaetigbarer Lamellenschalter
JP6519266A JPS44258B1 (US07922777-20110412-C00004.png) 1965-10-07 1966-10-05
FR79132A FR1498721A (fr) 1965-10-07 1966-10-07 Contacteurs magnétiques à lame
NL6614174A NL6614174A (US07922777-20110412-C00004.png) 1965-10-07 1966-10-07
CH1446066A CH460126A (de) 1965-10-07 1966-10-07 Reed-Relais

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US493657A US3334320A (en) 1965-10-07 1965-10-07 Magnetic reed switches having minimum contact bounce

Publications (1)

Publication Number Publication Date
US3334320A true US3334320A (en) 1967-08-01

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ID=23961177

Family Applications (1)

Application Number Title Priority Date Filing Date
US493657A Expired - Lifetime US3334320A (en) 1965-10-07 1965-10-07 Magnetic reed switches having minimum contact bounce

Country Status (7)

Country Link
US (1) US3334320A (US07922777-20110412-C00004.png)
JP (1) JPS44258B1 (US07922777-20110412-C00004.png)
CH (1) CH460126A (US07922777-20110412-C00004.png)
DE (1) DE1640179A1 (US07922777-20110412-C00004.png)
FR (1) FR1498721A (US07922777-20110412-C00004.png)
GB (1) GB1129357A (US07922777-20110412-C00004.png)
NL (1) NL6614174A (US07922777-20110412-C00004.png)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120235774A1 (en) * 2011-03-16 2012-09-20 Kabushiki Kaisha Yaskawa Denki Reed switch
US20170194119A1 (en) * 2014-09-26 2017-07-06 Deqiang Jing Magnetic reed switch

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414476A (en) * 1945-04-19 1947-01-21 Bell Telephone Labor Inc Relay
US2450499A (en) * 1945-09-21 1948-10-05 Bell Telephone Labor Inc Circuit maker and breaker
US2497547A (en) * 1946-04-20 1950-02-14 Hastings Charles Edwin Magnetic switch
US2758173A (en) * 1954-03-22 1956-08-07 Iron Fireman Mfg Co Electric circuit chopper
US2929895A (en) * 1956-12-27 1960-03-22 Bell Telephone Labor Inc Switching device
US3117202A (en) * 1962-04-26 1964-01-07 Gen Electric Magnetic reed switches

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414476A (en) * 1945-04-19 1947-01-21 Bell Telephone Labor Inc Relay
US2450499A (en) * 1945-09-21 1948-10-05 Bell Telephone Labor Inc Circuit maker and breaker
US2497547A (en) * 1946-04-20 1950-02-14 Hastings Charles Edwin Magnetic switch
US2758173A (en) * 1954-03-22 1956-08-07 Iron Fireman Mfg Co Electric circuit chopper
US2929895A (en) * 1956-12-27 1960-03-22 Bell Telephone Labor Inc Switching device
US3117202A (en) * 1962-04-26 1964-01-07 Gen Electric Magnetic reed switches

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120235774A1 (en) * 2011-03-16 2012-09-20 Kabushiki Kaisha Yaskawa Denki Reed switch
US8659375B2 (en) * 2011-03-16 2014-02-25 Kabushiki Kaisha Yaskawa Denki Reed switch
US8760246B2 (en) 2011-03-16 2014-06-24 Kabushiki Kaisha Yaskawa Denki Reed switch
US20170194119A1 (en) * 2014-09-26 2017-07-06 Deqiang Jing Magnetic reed switch
US10217584B2 (en) * 2014-09-26 2019-02-26 Deqiang Jing Magnetic reed switch

Also Published As

Publication number Publication date
GB1129357A (en) 1968-10-02
JPS44258B1 (US07922777-20110412-C00004.png) 1969-01-09
CH460126A (de) 1968-07-31
NL6614174A (US07922777-20110412-C00004.png) 1967-04-10
FR1498721A (fr) 1967-10-20
DE1640179A1 (de) 1970-10-29

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