US3315193A - Reed switch adapted for rapid cycling - Google Patents

Reed switch adapted for rapid cycling Download PDF

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Publication number
US3315193A
US3315193A US482699A US48269965A US3315193A US 3315193 A US3315193 A US 3315193A US 482699 A US482699 A US 482699A US 48269965 A US48269965 A US 48269965A US 3315193 A US3315193 A US 3315193A
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US
United States
Prior art keywords
reed
switch
reeds
post
contact member
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
US482699A
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English (en)
Inventor
John D Santi
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.)
Briggs and Stratton Corp
Original Assignee
Briggs and Stratton Corp
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
Priority to CA824230A priority Critical patent/CA824230A/en
Application filed by Briggs and Stratton Corp filed Critical Briggs and Stratton Corp
Priority to US482699A priority patent/US3315193A/en
Priority to US500860A priority patent/US3292122A/en
Priority to GB46070/65A priority patent/GB1116914A/en
Priority to SE14469/65A priority patent/SE314437B/xx
Priority to FR37907A priority patent/FR1464734A/fr
Priority to DE19651514054D priority patent/DE1514054B1/de
Priority to CH1559965A priority patent/CH457585A/de
Priority to DEB87502A priority patent/DE1279190B/de
Priority to GB28181/66A priority patent/GB1153138A/en
Priority to FR74183A priority patent/FR1490868A/fr
Application granted granted Critical
Publication of US3315193A publication Critical patent/US3315193A/en
Priority to DE19691954237 priority patent/DE1954237A1/de
Priority to US27315D priority patent/USRE27315E/en
Priority to FR7038848A priority patent/FR2066643A5/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/0201—Materials for reed contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • 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
    • 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
    • H01H51/285—Polarised relays for latching of contacts
    • 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
    • H01H51/288—Freely suspended contacts
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S65/00—Glass manufacturing
    • Y10S65/12—Reed switch

Definitions

  • This invention relates to magnetically actuated dry reed switches and refers more particularly to a dry reed switch which is especially well suited for use in applications where the switch is required to open and close rapidly at recurrent intervals of short duration.
  • a dry reed switch is a well known device that comprises, in its normally open version, a pair of resilient metal reeds which extend axially into an evacuated tube from opposite ends thereof with their tip portions overlapping in the medial portion of the tube and laterally spaced apart by a small distance.
  • the reeds are magnetically permeable; hence when a magnetic field is caused to thread the reeds and the gap between them, the tip portions of the reeds are magnetically attracted and the reeds flex into switch closing engagement with one another.
  • the reed switch possesses, in theory, many desirable characteristics that adapt it very well for use in applications where it is required to open and close an electrical circuit at short and frequent intervals.
  • the small mass of the reeds enables them to respond very quickly to changes in a magnetic field to which they are subjected.
  • a reed switch can be actuated by an instrumentality such as a solenoid or a permanent magnet which does not make physical contact with the reeds; hence the reed switch eliminates many of the problems of friction and mechanical wear that might be encountered with other types of switching apparatus in installations where rapid and frequently repeated on-and-oif operation is required.
  • the present invention is directed to the solution of certain long standing and well recognized problems that have been encountered with heretofore conventional reed switches. While such problems were especially troublesome where a reed switch was required to close and open recurrently at short intervals, they also existed in cases where substantially long time intervals occurred between each opening and closing cycle.
  • Another and more specific object of this invention is to provide very simple and inexpensive means in a normally open dry reed switch for preventing separation of the reeds by substantially more than a small predetermined distance during the interval following switch opening, and for causing the reeds to have a somewhat damped vibratory motion for a period following each switch opening, which motion is of high frequency but low amplitude so that the mean air gap between the reeds while they are in such vibratory motion is of a smaller value than their normal or at-rest air gap, whereby the reeds are highly responsive, during their period of vibratory motion, to the build-up of an actuating magnetic field.
  • a further specific object of this invention is to provide a simple and inexpensive reed switch of the character described wherein make bounce is substantially completely eliminated and wherein very rapid and clean separation of the contacts takes place at switch opening despite a small air gap between the reeds.
  • each reed of a normally open reed switch a relatively thicker post that extends along the reed at the side thereof remote from the other reed and is secured to the fixed end of its reed, the arrangement of each reed and its post being such that the reed is free to swing away from its post but is engaged with its post under bias when the reed is in its normally open or at-rest position.
  • FIGURE 1 is a longitudinal sectional view of a dry reed switch embodying the principles of this invention, shown in its normal switch-open condition;
  • FIGURE 2 is a view similar to FIGURE 1 but showing the switch in its closed condition
  • FIGURE 3 is a cross-sectional view taken on the P131116 of the line 33 in FIGURE 1, but on an enlarged sca e;
  • FIGURE 4 is a composite view of one of the reeds of a switch of this invention and its post, the two being shown in disassembled relation to illustrate the curvature that the reed has when in relaxed condition and by which it tends to be maintained engaged with its post under bias in the assembled switch;
  • FIGURE 5 is a graph showing the movement of the tip of one of the reeds of a prior conventional reed switch during an interval following separation of the switch contacts;
  • FIGURE 6 is a graph comparable to FIGURE 5 but showing the movement of the tip of a reed in the switch of the present invention.
  • the normally open dry reed switch 5 of the present invention is characterized by the fact that its reeds are arranged in pairs, each pair comprising an electrically conductive and magnetically permeable flexible reed 6 and a substantially stiffer reed or post 7 which may also be of magnetically permeable material and which extends alongside the flexible reed 6 and is normally in contact with the latter along most of its length. It is an important feature of this invention that the thinner reed 6 tends to remain in engagement with the post '7 under bias, or in other words is preloaded toward the post so as to bear against the same with some force when the switch is in its open and at-rest condition.
  • the inner tip portions 8 of the two flexible reeds 6 provide the actual contactors of the switch, while the stiffer reed or post 7 of each pair of reeds cooperates with its flexible reed 6 to increase the frequency and decrease the amplitude of the normal mechanical vibration of the reed, and also to improve the magnetic performance of the switch, all as hereinafter explained.
  • the posts 7 can be made of the same material as the flexible reeds 6, but that they should have a thicker cross-section.
  • the reeds of the switch of this invention are housed in a tubular envelope 9 of glass or other inert and electrically non-conductive material.
  • the envelope may be evacuated in the sense that its interior does not contain atmospheric 'air; that is, it may be under a partial or a substantially complete vacuum, or it may be filled with an inert gas, depending upon the purpose for which the device is intended, all as is well understood in the art.
  • the two pairs of reeds extend into the envelope substantially axially from opposite ends thereof, and they have their free end or tip portions 8 overlapped in the medial portion of the envelope but laterally spaced 'apart to define a gap 13 between them.
  • Each pair of reeds is fastened, as by small welds 10, to the inner end of a rod-like carrier 11 which projects coaxially through an end wall of the envelope, the material of the envelope being fused around the rod and the welds 10 to insure a rigid mounting of the carrier and a good seal between the carrier and the envelope.
  • the outer end of the carrier 11 projects beyond the envelope to provide a terminal 14 for the switch.
  • Each pair of reeds is arranged with its flexible reed 6 nearer the flexible reed 6 of the other pair.
  • each post 7 is located at the side of its flexible reed 6 that isremote from the other flexible reed.
  • the two reeds 6 and 7 of each pair are in effect connected at their captive ends 12 by reason of their mutual securement to the inner end of the carrier 11, but otherwise they are free to flex independently of one another along their entire lengths. Furthermore the two reeds 6 and 7 of each pair are preferably equal in length so that their tips are even with one another.
  • each post 7 While there may be no substantial performance ad vantage in making the posts 7 of magnetically permeable material, there is also no substantial disadvantage in doing so, and hence, as indicated above, it may be con venient from a production standpoint to make the posts 7 of the same material as the reeds 6. Again, it is not essential from the standpoint of switch performance that each post 7 have the same length as its reed 6, but production is facilitated by having the post 'and reed equal in length.
  • FIGURE 5 illustrates the motion that the tip of one reed would have during such vibratory motion in the absence of the post.
  • each of the reeds 6 has a preload by which it tends to engage its post 7, near the tip of the latter, under bias.
  • This preload result-s from the fact that the reed 6 is made with a curvature along its length (see FIGURE 4) and is clamped into flatwise engagement with its post 7 during welding or other securement of the reed and the post to their rod-like carrier 11.
  • the reed has flexing stresses which tend to maintain its tip portion engaged under bias with the post.
  • the preload insures very rapid separation of the contacts when the actuating magnetic field decreases to the switch opening value, even though the normal gap 13 between the reeds at rest is very small.
  • a switch of this invention can be designed with its gap 13 extremely small, to the point where the size of the gap is controlled by production considerations and voltage requirements of the circuit in which the switch is to be used; and this small gap, in turn, causes the switch to respond rapidly 'and dependably to magnetic actuating fields of small value. Further, because of the small gap, the reeds cannot, during their closing movements, build up such momentum as produces contact bounce.
  • the preload upon the reeds 6 causes the switch of this invention to have a very rapid and positive closing action.
  • the actuating magnetic field must have risen to a substantially high value before the preload is overcome to the point where the reed 6 begins to be actuated away from its post 7; but the stresses subsequently imposed upon the reed by its flexing to its closed position are relatively small in relation to its preload.
  • the tip of the reed 6 separates from the tip of its post 7, the magnetic attraction between the reed tips increases much more rapidly than the stresses in the reeds.
  • a further and very important consequence of the preload upon each reed 6 is that the mechanical vibration of the reed which follows each opening of the switch is of relatively high frequency and low amplitude. Because of its preload, the reed 6 accelerates rapidly away from its switch-closed position (shown in FIGURE 2) when the actuating magnetic field decreases to the switchopen val-ue,acquiring sufficient momentum to strike its post 7 with a force that causes it to rebound from the post. On the rebound, the reed swings nearly back to its closed position, but because of internal friction in the reed it will not go all the way to that position. If the envelope 11 is evacuated to a deep vacuum, a close approach of the rebounding reeds will be of no consequence. Where the reeds are not in a deep vacuum environment, and some arc-over after switch opening is tolerated or desired, any close approach of the reed tips to oneanother will likewise be of no consequence.
  • the frequency of vibration of the reed is substantially higher than its natural mechanical mode, but the amplitude of its vibration is substatnially smaller than it would be if the reed were in free vibration.
  • the oscillations of the reed tip are plotted in FIGURE 6.
  • FIGURE 6 The peculiar shape of the curve in FIGURE 6, characterized by a sharp peak at each rebound point, is in contrast to the slightly damped sine form of the FIGURE 5 curve. Also note from FIGURE 6 that at each successive rebound the reed tip swings through a slightly diminished distance. However, because the resilient reed 6 engages the post only at its tip, there is no substantial frictional damping between the reed and the post; therefore the rate of damping of the reeds vibration is not substantially greater than it would be in pure free vibration such as is illustrated in FIGURE 5.. Hence in a rapidly cycling system the reeds will still be in vibration from the previous opening when the next succeeding closure of the switch is to take place.
  • the mean air gap between them is smaller than when they are at rest, and hence a build-up in the actuating magnetic field can pick up the reeds at a time when they are closer to their contacting positions then they would be if they were at rest, so that the magnetic field need only swing the reeds through a small distance to bring their tips into contact.
  • closing of the switch is faster, more positive and in more precisely timed relation to the magnetic field cycle than if the reeds were at rest or in free vibration, and the reeds acquire less momentum-in swinging toward one another and are therefore less prone to make bounce.
  • each post 7 is placed in vibration by the recurrent rebounds of its reed against it, but because of its greater rigidity the mechanical mode of the post has a substantially higher amplitude and lower frequency than the reed. Furthermore, the frequency and amplitude of post vibration are affected by the recurrent collisions with the reed in the same way that the reed is affected by the post. Hence for practical purposes the post can be assumed to be substantially stationary.
  • this invention provides a normally open reed switch having Very simple, inexpensive and effective means for insuring that switch closure will always occur substantially without make bounce and in precisely timed relationship to each build-up in a cyclically varying magnetic field.
  • a magnetically actuated switch of the type comprising a conductive reed mounted at one end and having its opposite end portion in normally spaced relationship to a cooperating conductive and magnetically permeable contact member, said reed being resiliently flexible and magnetically permeable so that it can be flexed to bring its said opposite end portion into switch closing contact with said contact member by a magnetic field threading the reed, the contact member and the space between the contact member and said opposite end portion of the reed, means for stabilizing the timing of each of a rapid succession of closures of the switch so that each closure occurs just as a cyclically varying magnetic field builds to a predetermined value, said means comprising: a post stiffer than the reed and having an end fixed to the reed near the fixed end of the reed, said post extending alongside the reed at the side thereof remote from the contact member, and the reed being normally engaged with the post under bias when the reed is at rest.
  • a magnetically actuated switch adapted for rapidly recurrent opening and closing, said switch comprising:
  • said reeds being resiliently flexible and magnetically permeable so that they can be flexed toward one another, to carry their tip portions into switch closing engagement, by means of a magnetic field threading the reeds and the gap between their tip portions, and
  • each of said stiffer reeds being anchored to the envelope adjacent to the anchorage of its flexible reed and extending lengthwise along its flexible reed
  • each of said stitfer reeds being located at the side of its flexible reed that is remote from the other flexible reed
  • each of said stiffer reeds normally serving as a stop which prevents separation of the first designated reeds by more than said predetermined distance.
  • a dry reed switch adapted for rapidly recurrent opening and closing, comprising:
  • one of said reeds being resiliently flexible and magnetically permeable
  • D. means mounting the two reeds in lengthwise adjacent side-by-side relationship with their adjacent ends fixed to a common anchorage and with their opposite end portions substantially free for independent flexing motion and normally engaging one another under flexing bias;
  • E. means fixing the first designated ends of the two reeds to the opposite end of the envelope (1) with said pair of reeds extending substantially axially into the envelope,
  • C. means mounting said second reeds in lengthwise adjacent side-by-side relationship, with their adjacent ends fixed to a common anchorage, with said second stiffer reed at the side of said second flexible reed that is remote from the first designated pair of reeds, and with the opposite end portions of said second reeds free for independent flexing motion but normally engaging one another under bias.
  • a magnetically actuated switch of the type having a pair of reeds, each fixed at one end and having its free end portion laterally adjacent to that of the other reed and normally spaced therefrom by a predetermined distance, said reeds being resiliently flexible and magnetically permeable so that a magnetic flux threading the reeds and the space between their free end portions flexingly swings their free end portions into engagement, said switch being characterized by:
  • each of said reeds being flexingly so biased as to be urged beyond said predetermined distance from the free end portion of the other reed;
  • each of said rebound stop members comprising a post-like elongated member having one end fixedly connected with the fixed end of its reed and extending along its reed substantially all the way to the free end of the latter.
  • each of said rebound stop members being (1) magnetically permeable and (2) in magnetic shunt circuit with its reed.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Contacts (AREA)
  • Electromagnets (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Springs (AREA)
  • Coils Or Transformers For Communication (AREA)
US482699A 1964-11-12 1965-08-26 Reed switch adapted for rapid cycling Expired - Lifetime US3315193A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
CA824230A CA824230A (en) 1964-11-12 Reed switch adapted for rapid cycling
US482699A US3315193A (en) 1964-11-12 1965-08-26 Reed switch adapted for rapid cycling
US500860A US3292122A (en) 1964-11-12 1965-10-22 Electromagnetic relay having separate make and break iinductance coils
GB46070/65A GB1116914A (en) 1964-11-12 1965-11-01 Remanent relay having sealed magnetic contact devices
SE14469/65A SE314437B (de) 1964-11-12 1965-11-09
DE19651514054D DE1514054B1 (de) 1964-11-12 1965-11-10 Schutzrohrkontakt-Haftrelais
FR37907A FR1464734A (fr) 1964-11-12 1965-11-10 Contacteur à aimantation permanente hermétiquement scellé et procédé de traitement de ses lamelles et de leurs couches de contact
CH1559965A CH457585A (de) 1964-11-12 1965-11-11 Relais mit in einer mit Schutzgas gefüllten Glasröhre angeordneten Kontaktzungen aus hartmagnetischem Material
DEB87502A DE1279190B (de) 1964-11-12 1966-06-10 Magnetisch betaetigter Schutzrohrkontakt
GB28181/66A GB1153138A (en) 1964-11-12 1966-06-23 A Magnetically Operable Reed Contact Unit
FR74183A FR1490868A (fr) 1964-11-12 1966-08-25 Interrupteur sec à lames actionné magnétiquement
DE19691954237 DE1954237A1 (de) 1964-11-12 1969-10-28 Schutzrohrkontakt
US27315D USRE27315E (en) 1964-11-12 1970-07-31 Reed switch adapted for rapid cycling
FR7038848A FR2066643A5 (de) 1964-11-12 1970-10-28

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
YU161464 1964-11-12
US482699A US3315193A (en) 1964-11-12 1965-08-26 Reed switch adapted for rapid cycling
DE19691954237 DE1954237A1 (de) 1964-11-12 1969-10-28 Schutzrohrkontakt
US6005570A 1970-07-31 1970-07-31

Publications (1)

Publication Number Publication Date
US3315193A true US3315193A (en) 1967-04-18

Family

ID=27430968

Family Applications (3)

Application Number Title Priority Date Filing Date
US482699A Expired - Lifetime US3315193A (en) 1964-11-12 1965-08-26 Reed switch adapted for rapid cycling
US500860A Expired - Lifetime US3292122A (en) 1964-11-12 1965-10-22 Electromagnetic relay having separate make and break iinductance coils
US27315D Expired USRE27315E (en) 1964-11-12 1970-07-31 Reed switch adapted for rapid cycling

Family Applications After (2)

Application Number Title Priority Date Filing Date
US500860A Expired - Lifetime US3292122A (en) 1964-11-12 1965-10-22 Electromagnetic relay having separate make and break iinductance coils
US27315D Expired USRE27315E (en) 1964-11-12 1970-07-31 Reed switch adapted for rapid cycling

Country Status (7)

Country Link
US (3) US3315193A (de)
CA (1) CA824230A (de)
CH (1) CH457585A (de)
DE (3) DE1514054B1 (de)
FR (2) FR1464734A (de)
GB (2) GB1116914A (de)
SE (1) SE314437B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5909163A (en) * 1996-09-11 1999-06-01 Hermetic Switch, Inc. High voltage reed switch

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3426302A (en) * 1966-10-31 1969-02-04 Bell Telephone Labor Inc Sealed reed switch with adjustable reed
US3356974A (en) * 1967-03-02 1967-12-05 Allen Bradley Co Reed switch having an atmosphere to prevent sticking of the pole pieces therein
JPS54496B1 (de) * 1967-12-27 1979-01-11
US3584173A (en) * 1969-08-13 1971-06-08 Cunningham Corp Reed switch with improved contact isolation
DE3102710A1 (de) * 1981-01-28 1982-08-12 Erik Groesen 8800 Aarhus Jensen Dichtungsvorrichtung
FR2502392A1 (fr) * 1981-03-20 1982-09-24 Socapex Relais electromagnetique a position de fonctionnement indifferente
FR2502389A1 (fr) * 1981-03-20 1982-09-24 Socapex Interrupteur a position de fonctionnement indifferente et relais utilisant un tel interrupteur
DE3318399C1 (de) * 1983-05-20 1984-11-22 Werner 7925 Dischingen Hauff Vorrichtung zur Herstellung einer Durchführung für Leitungen, wie Rohre, Kabel oder dergl., in einer Betonwand
DE19949131A1 (de) * 1999-10-12 2001-04-19 Behr Gmbh & Co Abdichtanordnung für eine Leitungsdurchführung
JP5365655B2 (ja) 2011-03-16 2013-12-11 株式会社安川電機 リードスイッチ

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US2264124A (en) * 1940-06-27 1941-11-25 Bell Telephone Labor Inc Relay
US2264746A (en) * 1940-06-27 1941-12-02 Bell Telephone Labor Inc Electromagnetic switch
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
US2929895A (en) * 1956-12-27 1960-03-22 Bell Telephone Labor Inc Switching device
US2969134A (en) * 1955-06-03 1961-01-24 Ite Circuit Breaker Ltd Solenoid operated positive drive clutch
US2993104A (en) * 1959-01-21 1961-07-18 Gen Electric Electromagnetic relay
US3025371A (en) * 1961-05-05 1962-03-13 Medal Einar Shockproof magnetic reed switch
US3059074A (en) * 1957-04-09 1962-10-16 Int Standard Electric Corp Electrical switching device and method for making
US3165608A (en) * 1962-12-21 1965-01-12 Ibm Magnetic switching apparatus for reducing contact bounce

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US2264022A (en) * 1940-06-27 1941-11-25 Bell Telephone Labor Inc Relay
US2548889A (en) * 1949-11-09 1951-04-17 Robert E Kester High-speed coaxial relay
DE1748669U (de) * 1956-11-29 1957-07-18 Lorenz C Ag Stuetzrelais.
DE1095945B (de) * 1957-11-22 1960-12-29 Siemens Ag Relaisstreifen mit Schutzrohrkontaktrelais
DE1116837B (de) * 1959-09-29 1961-11-09 Siemens Ag Gleichstrom-Schutzkontakt mit nur einem vergueteten Kontaktstueck
NL129301C (de) * 1959-10-22
US3005072A (en) * 1959-10-22 1961-10-17 Bell Telephone Labor Inc Electrically controlled switching device
US3252083A (en) * 1964-07-22 1966-05-17 Bell Telephone Labor Inc System for monitoring condition changes in a switching device

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Publication number Priority date Publication date Assignee Title
US1531347A (en) * 1922-04-25 1925-03-31 American Telephone & Telegraph Relay
US2264124A (en) * 1940-06-27 1941-11-25 Bell Telephone Labor Inc Relay
US2264746A (en) * 1940-06-27 1941-12-02 Bell Telephone Labor Inc Electromagnetic switch
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
US2969134A (en) * 1955-06-03 1961-01-24 Ite Circuit Breaker Ltd Solenoid operated positive drive clutch
US2929895A (en) * 1956-12-27 1960-03-22 Bell Telephone Labor Inc Switching device
US3059074A (en) * 1957-04-09 1962-10-16 Int Standard Electric Corp Electrical switching device and method for making
US2993104A (en) * 1959-01-21 1961-07-18 Gen Electric Electromagnetic relay
US3025371A (en) * 1961-05-05 1962-03-13 Medal Einar Shockproof magnetic reed switch
US3165608A (en) * 1962-12-21 1965-01-12 Ibm Magnetic switching apparatus for reducing contact bounce

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5909163A (en) * 1996-09-11 1999-06-01 Hermetic Switch, Inc. High voltage reed switch

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Publication number Publication date
US3292122A (en) 1966-12-13
CH457585A (de) 1968-06-15
DE1514054B1 (de) 1971-02-04
DE1279190B (de) 1968-10-03
FR1464734A (fr) 1967-01-06
SE314437B (de) 1969-09-08
DE1954237A1 (de) 1971-05-06
GB1116914A (en) 1968-06-12
CA824230A (en) 1969-09-30
GB1153138A (en) 1969-05-21
FR2066643A5 (de) 1971-08-06
USRE27315E (en) 1972-03-21

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