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Publication numberUS2264746 A
Publication typeGrant
Publication dateDec 2, 1941
Filing dateJun 27, 1940
Priority dateJun 27, 1940
Publication numberUS 2264746 A, US 2264746A, US-A-2264746, US2264746 A, US2264746A
InventorsEllwood Walter B
Original AssigneeBell Telephone Labor Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Electromagnetic switch
US 2264746 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Dec. 2, 1941. w.'B. ELLWOOD V 2,264,743v ELECTROMAGNETIC SWITCH Filed Junev 27, 1940 FIG.

I INVENTOR v mafluvooo 1 I 'U I,

4 TTORNE V Patented Dec. 2, 1941 ELECTROMAGNETIC SWITCH Walter B. Ellwood, New York, N. Y., assignor to Bell Telephone Laboratories,


New York, N. Y., a corporation of New York Application June 2'1, 1940, Serial No. 342,629

2 Claims.

This invention relates to switches and particularly to electromagneticaliy operated switches.

The object of the invention is to provide a relay unit contact device which is economical, reliable and easily replaceable.

A feature of the invention is a contact arrangement for transfer operation consisting essentially of contacts of magnetic material sealed in a vessel either. evacuated or filled with an inert gas which may be operated by an external magnetic force whereby costly contact metals are eliminated. To secure transfer operations two magnetic elements are placed lengthwise in the vessel and are slightly overlapping but normally out of contact with each other. To one of these elements is secured by insulation a third and nonmagnetic member which is normally in contact with the other said magnetic element. When an external magnetic force is applied to this unit the two magnetic members which form part of the magnetic circuit as well as part of the electrical circuit of the device are moved together whereby the contact from the second magnetic element is transferred from the non-magnetic element to the first magnetic element since the external magnetic force acts to diminish the air-gap between the two said magnetic elements. The construction of this device involves the use of an insulating member to maintain constant separation between the said non-magnetic element and its associated magnetic element, whereby the second magnetic element thus effectively travels between the two.

Another feature of the invention is the use of a movable contact assembly. In this type relay where the part corresponding to the armature'in a normal relay and the part corresponding to the front contact in a normal relay are both part of the magnetic circuit and both are subject to movement when energized, the part corresponding to the back contact of a normal relay must be made comparatively flexible and caused to move with the front contact since the direction of movement of such front contact is toward the back contact. r

This contact device is of the general nature shown in Patent 2,187,115 to Ellwood et al., January 16, 1940. v

The drawing consists of a single sheet showing three cross-section views of the contact unit.

Fig. 1 shows a cross-section of the unit when taken lengthwise. l is a glass envelope which may be evacuated or filled with an inert gas to prevent corrosion or oxidation. 2 is a terminal entering the envelope to which is attached a resilient magnetic member 3. At the other end of this device a non-magnetic member 4 and a conducting member 5 are sealed into the glass. A magnetic member 6 is attached to the conducting member 5 in any well-known manner, for instance, by welding. The non-magnetic member 4 and the magnetic member 6 are held to a permanent degree of separation by an insulating piece 1. The non-magnetic member 4, the magnetic member 6 and the insulating piece I may be slightly movable as a unit.

As shown in Fig. 1 the contact device is nonoperated and a connection is made between the non-magnetic member 4 and the magnetic member 3. In Fig. 2 the device is shown in its operated position with contact being made between the magnetic member 6 and the magnetic member 3. This illustrates. how the insulating piece I prevents the non-magnetic member 4 which is tensioned'downwardly from following the nonmagnetic member 3 when it moves into contact with the magnetic member 5. Fig. 3 shows a cross-section on the lines 3 3 to illustrate one method by which the insulating piece I may be attached to the non-magnetic member 4 and the magnetic member 6.

This contact device may be operated by a coil external to the envelope I whereby the magnetic members 3 and 6 become part of the magnetic circuit as well as part of the electrical circuit of the device.

What is claimed is:

v 1. A magnetically operated switch structure comprising a pair of magnetic reeds mounted longitudinally in an evacuated or inert gas-filled tube with their inner ends overlapping but normally out of contact with each other, a third non-magnetic element mounted longitudinally and permanently spaced from its companion magnetic reed by insulation whereby said nonmagnetic member and its companion magnetic reed will flex as a unit, said non-magnetic member being normally in contact with the other of said magnetic reeds, and means for producing a magnetomotive force along the axis of said tube for causing the normal air gap between said magnetic reeds to shorten to cause a transfer of contacts between said elements.

2. A magnetically operated switch structure comprising an evacuated or inert gas-filled tube, a magnetic reed sealed into one end of said tube and extending parallel to the axis of said tube, another magnetic reed sealed into the other end of said tube and extending parallel to the axis of said tube, the other ends of said magnetic toward each other the contact between said set! 0nd reed and said non-maanetic member will be broken and a contact between said magnetic reeds will be established. and means for energizin: said contact device by a field extending along the axis of said tube.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2491907 *Jun 11, 1946Dec 20, 1949Stevens Arnold IncPolarized magnetic switch structure
US2506414 *Dec 5, 1947May 2, 1950Bell Telephone Labor IncSealed wire contact device
US2535400 *Aug 25, 1949Dec 26, 1950Bell Telephone Labor IncMulticontact dry reed relay
US2570315 *Jul 7, 1948Oct 9, 1951Ford Motor CoMagnetic operated switch
US2648167 *Dec 18, 1948Aug 11, 1953Bell Telephone Labor IncMachine for manufacturing switches
US2696543 *Nov 8, 1952Dec 7, 1954Bell Telephone Labor IncElectric switch
US2732451 *Jul 20, 1951Jan 24, 1956FKG More specificallyDegler
US2760027 *May 12, 1953Aug 21, 1956Iron Fireman Mfg CoHigh speed relay
US2764647 *Jan 11, 1952Sep 25, 1956Cook Electric CoMagnetostrictive relay
US2840660 *Jun 16, 1955Jun 24, 1958G M Giannini & Co IncDouble-throw magnetically operated sealed switch
US2840661 *Jun 16, 1955Jun 24, 1958G M Giannini & Co IncMagnetic switch device
US2845506 *Jun 28, 1954Jul 29, 1958Pioneer Electronic CorpHigh voltage high vacuum relay
US2922856 *Dec 20, 1956Jan 26, 1960Siemens AgElectromagnetic switch
US2997546 *Nov 4, 1958Aug 22, 1961Bell Telephone Labor IncSwitching device
US3030451 *Nov 4, 1958Apr 17, 1962Bell Telephone Labor IncSwitching device
US3250875 *Jan 21, 1964May 10, 1966George WintrissReed switch
US3315193 *Aug 26, 1965Apr 18, 1967Briggs & Stratton CorpReed switch adapted for rapid cycling
US3943474 *Dec 16, 1974Mar 9, 1976Shlesinger Jr Bernard EReed and reed switch therefor
US4038620 *Sep 8, 1975Jul 26, 1977Shlesinger Jr B EdwardMagnetic reed switch
US7873437Feb 13, 2004Jan 18, 2011Dyson Technology LimitedAutonomous machine
US7932644 *Jun 28, 2007Apr 26, 2011Rockwell Automation LimitedSafety switch
US8040082May 14, 2007Oct 18, 2011Linak A/SLinear actuator
US8111119Aug 21, 2007Feb 7, 2012Gilmore Glendell NReed switch apparatus and method of using same
US8183986 *Mar 24, 2005May 22, 2012Telematics Wireless LtdToll transponder with deactivation means
US8620661 *Feb 28, 2011Dec 31, 2013Momilani RamstrumSystem for controlling digital effects in live performances with vocal improvisation
US8734262Sep 23, 2008May 27, 2014David A. YovanovichBilliard ball rack positioning system and use thereof
US8866570Feb 7, 2012Oct 21, 2014Glendell N. GilmoreReed switch apparatus and method of using same
US9580208Sep 23, 2014Feb 28, 2017Glendell N. GilmoreReed switch apparatus and method of using same
US20060125603 *Mar 24, 2005Jun 15, 2006Telematics Wireless Ltd.Toll transponder with deactivation means
US20060150361 *Feb 13, 2004Jul 13, 2006Dyson Technology LimitedAutonomous machine
US20060161318 *Feb 13, 2004Jul 20, 2006Dyson Technology LimitedAutonomous machine
US20060252469 *May 9, 2005Nov 9, 2006Roger LuShut down mechanism for handheld device
US20080074214 *Jun 28, 2007Mar 27, 2008Julian PoynerSafety switch
US20090091287 *May 14, 2007Apr 9, 2009Linak A/SLinear Actuator
US20110218810 *Feb 28, 2011Sep 8, 2011Momilani RamstrumSystem for Controlling Digital Effects in Live Performances with Vocal Improvisation
US20160311698 *Jul 28, 2015Oct 27, 2016Maxtec Plastics, Inc.Ultraviolet-ray lamp water sterilization device and method for controlling the same
CN105464745A *Dec 18, 2015Apr 6, 2016重庆五福科技有限公司发动机及机油报警器
DE1033762B *Dec 28, 1955Jul 10, 1958Siemens AgDurch ein Magnetfeld gesteuerter Schutzrohrwechselkontakt
DE1064428B *Oct 23, 1957Aug 27, 1959Siemens AgAnordnung zur Steuerung von Einrichtungen an der Fahrstrecke durch den bewegten Behaelter
DE1108593B *Feb 9, 1959Jun 8, 1961Werner VossVorrichtung zum Scharfschalten einer elektrischen Einbruchs- und Diebstahlsicherung, insbesondere fuer Kraftfahrzeuge
DE1514750B1 *Mar 16, 1965Jul 16, 1970Standard Elektrik Lorenz AgEinfach- oder Mehrfachkontakt in abgeschlossenem Gehaeuse
EP2061037A2 *Nov 7, 2008May 20, 2009GE-Hitachi Nuclear Energy Americas LLCMethod and apparatus for permissive control of a mast and grapple
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EP3116080A1Jul 8, 2015Jan 11, 2017Vestel Elektronik Sanayi ve Ticaret A.S.A high efficiency limiter circuit
WO2017040397A1Aug 29, 2016Mar 9, 20173M Innovative Properties CompanyPersonal protective equipment and methods of monitoring time of usage of personal protective equipment
U.S. Classification335/154
International ClassificationH01H51/00, H01H51/28
Cooperative ClassificationH01H51/287
European ClassificationH01H51/28F