US2921163A - Tube-protected contact-making device - Google Patents

Tube-protected contact-making device Download PDF

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Publication number
US2921163A
US2921163A US749507A US74950758A US2921163A US 2921163 A US2921163 A US 2921163A US 749507 A US749507 A US 749507A US 74950758 A US74950758 A US 74950758A US 2921163 A US2921163 A US 2921163A
Authority
US
United States
Prior art keywords
contact
springs
contact springs
making device
tube
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
US749507A
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English (en)
Inventor
Pfleiderer Friedrich
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.)
Siemens and Halske AG
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Application granted granted Critical
Publication of US2921163A publication Critical patent/US2921163A/en
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
    • H01H1/00—Contacts
    • H01H1/64—Protective enclosures, baffle plates, or screens for contacts
    • H01H1/66—Contacts sealed in an evacuated or gas-filled envelope, e.g. magnetic dry-reed contacts
    • 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
    • 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
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J2893/00—Discharge tubes and lamps
    • H01J2893/0072—Disassembly or repair of discharge tubes
    • H01J2893/0073—Discharge tubes with liquid poolcathodes; constructional details

Definitions

  • This invention is concerned with a sealed-in or tubeprotected contact-making device.
  • the object of the invention is to provide a tube-protected contact-making device comprising means built into the contact springs for holding such springs in operatively actuated closed position depending upon the current flowing therethrough, thereby eliminating the necessity for separate holding means such as holding coils or switches or permanent magnets and the like.
  • Sealed-in contacts are in known manner actuated by impressing upon the contact springs thereof a magnetic flux which generates across the working air gap a field causing attraction of the contact springs and therewith closure of the contact points.
  • the magnetic flux is customarily produced by means of an energizing or exciter winding or coil surrounding the sealed-in contact.
  • a holding fiux In case a sealed-in contact is to be held in operatively actuated, that is, in closed position, a holding fiux must be generated to flow over the contact springs after closure thereof.
  • Such holding flux may be generated either by the exciter winding or by a separate holding winding. It has also been proposed to provide a permanent magnet for producing the holding flux.
  • the invention shows a way of eliminating separate windings or permanent magnets and the like, for generating the holding flux, resulting in considerable reduction of expenditure required for circuits employing sealed-in contacts.
  • the contact springs are provided centrally thereof with contact portions having an electrical conductivity which is substantially higher than that of adjacent portions of the springs, causing in the presence of current flow across the closed contact portions generation of a magnetic field surrounding the corresponding portion annularly, such field permeating both contact springs and holding such springs in closed position.
  • the holding of the contact springs in the sealed-in contact device according to the invention, in closed position thereof, may thus be made to depend upon the current flowing over the contact springs, that is, the contacts will remain closed so long as current flow is maintained thereover in the circuit in which the corresponding contacts are included.
  • FIG. 1 shows on an enlarged scale a known sealed-in contact device
  • Fig. 2 is a greatly enlarged perspective view of an example of the invention, showing contact springs compris' ing contact portions of high conductivity;
  • Fig. 3 is a sectional view of the contact springs in closed position thereof.
  • the known sealed-in contact shown in Fig. 1 comprises contact springs F1 and F2 extending in sealed relation into the vessel or tube S.
  • the tube is surrounded by an 2,921,163 Patented Jan. 12, 1960 ice lapping relationship.
  • Letter D indicates a terminal wire connected to the contact spring F1.
  • Electrical conductors L1 and L2 are respectively embedded centrally of the contact springs F1 and F2 along the facing sides of the springs. The conductivity of these conductors is considerably higher than that of the surrounding spring material.
  • the corresponding conductors may, for example, be made of silver which has a higher conductivity as compared with usual spring material, for example, iron.
  • the contact springs F1 and F2 may be included in a circuit to be controlled thereby and may be contained within a vessel such as S (Fig. l) which is surrounded by an energizing or exciting winding or coil-such as W. Accordingly, energization of the winding W will produce a magnetic flux across the air gap separating the contact springs in normal position thereof, producing a mutual attraction between the contact springs and consequently closure thereof, thus causing current to flow thereover in the circuit controlled thereby. The current will however fiow predominantly along the conductors L1 and L2 due to the high conductivity of such conductors.
  • Fig. 3 showing on a greatly enlarged scale a cross sectional view of contact springs made in accordance with the invention, in closed position thereof.
  • the conductors L1 and L2 are disposed centrally of the contact-making areas or portions of the contact springs F1 and F2, resulting in a current concentration along the conductors L1 and L2.
  • a magnetic field as indicated in dotted lines, extending annularly about the conductors L1 and L2, such field extending into and effecting both contact springs F1 and F2 and exerting a force of mutual attraction between the contact springs, thereby causing the springs to remain in closed position.
  • a prerequisite for the contact-holding action is that the current flowing along the embedded conductors is of sufiicient value to produce the magnetic holding field.
  • the plane surfaces of the conductors may for this purpose extend slightly beyond the corresponding planes of the contact springs, resulting in actuated position in an air gap between the fiux-carrying portions of the contact spring which, however, must be of practically negligible value to avoid weakening the magnetic flux extending annularly into and normally positioned therein separated by a gap,
  • each contact spring carrying upon the side thereof which faces the other contact spring a contact portion extending centrally of said side longitudinally of the corresponding contact spring made of a material having an electrical conductivity exceeding that of the spring material disposed adjacent thereto, means for generating a magnetic flux to eifect mutual attraction between said contact springs so as to eifect contact-making engagement between said contact portions, current flowing through the engaged contact portions generating a magnetic field extending .within and through said contact springs annularly about said contact portions, said magnetic field being about the conductorsin closed position of the contact effective to hold said contact portions in contact-making engagement for the duration of current flow through said springs.
  • a contact-making device wherein the contact portion on each of said contact springs is an electrical conductor embedded therein, the higher conductivity of said contact portions causing upon contact-making engagement thereof current concentration therein for producing said magnetic holding field.
  • a contact-making device according to claim 2, wherein said contact portionsare interconnectedwith the terminals extending from the respective contact springs.
  • A' contact-making device wherein ⁇ said contact portions are insulated from the material of the corresponding contact springs.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Contacts (AREA)
  • High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
US749507A 1957-08-13 1958-07-18 Tube-protected contact-making device Expired - Lifetime US2921163A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES54726A DE1056273B (de) 1957-08-13 1957-08-13 Schutzrohrkontakt

Publications (1)

Publication Number Publication Date
US2921163A true US2921163A (en) 1960-01-12

Family

ID=7489985

Family Applications (1)

Application Number Title Priority Date Filing Date
US749507A Expired - Lifetime US2921163A (en) 1957-08-13 1958-07-18 Tube-protected contact-making device

Country Status (7)

Country Link
US (1) US2921163A (sl)
BE (1) BE569796A (sl)
CH (1) CH358865A (sl)
DE (1) DE1056273B (sl)
FR (1) FR1201153A (sl)
GB (1) GB833917A (sl)
NL (2) NL230361A (sl)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099727A (en) * 1961-02-01 1963-07-30 Int Standard Electric Corp Magnetic crossbar switch
US3723688A (en) * 1970-08-20 1973-03-27 Licentia Gmbh Switch spring for a relay
US4433317A (en) * 1982-01-18 1984-02-21 Mechanical Enterprises, Inc. Controlled floating contactor switch

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2289830A (en) * 1938-03-29 1942-07-14 Bell Telephone Labor Inc Circuit closing device
US2343323A (en) * 1942-08-11 1944-03-07 Westinghouse Electric & Mfg Co Electric switch

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2289830A (en) * 1938-03-29 1942-07-14 Bell Telephone Labor Inc Circuit closing device
US2343323A (en) * 1942-08-11 1944-03-07 Westinghouse Electric & Mfg Co Electric switch

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3099727A (en) * 1961-02-01 1963-07-30 Int Standard Electric Corp Magnetic crossbar switch
US3723688A (en) * 1970-08-20 1973-03-27 Licentia Gmbh Switch spring for a relay
US4433317A (en) * 1982-01-18 1984-02-21 Mechanical Enterprises, Inc. Controlled floating contactor switch

Also Published As

Publication number Publication date
NL230361A (sl)
NL105365C (sl)
BE569796A (sl)
CH358865A (de) 1961-12-15
FR1201153A (fr) 1959-12-29
GB833917A (en) 1960-05-04
DE1056273B (de) 1959-04-30

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