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GB1305525A - - Google Patents

Info

Publication number
GB1305525A
GB1305525A GB1305525DA GB1305525A GB 1305525 A GB1305525 A GB 1305525A GB 1305525D A GB1305525D A GB 1305525DA GB 1305525 A GB1305525 A GB 1305525A
Authority
GB
United Kingdom
Prior art keywords
envelope
length
magnetized
polarized
under tension
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
Application number
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 filed Critical
Publication of GB1305525A publication Critical patent/GB1305525A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Contacts (AREA)
  • Manufacture Of Switches (AREA)

Abstract

1305525 Polarized contact devices STANDARD TELEPHONES & CABLES Ltd 22 March 1971 7466/71 Heading H1N A sealed magnetic reed contact device is polarized to give break-before-make contact action by a permanent magnet mounted within the envelope 1 and formed by a magnetized length 3 of nickel-iron alloy having a positive co-efficient of magnetostriction and a coefficient of thermal expansion matched to that of the envelope and the length 3 of nickeliron alloy is held under tension to give it a squarer hysteresis loop than the other magnetic members 2, 4. The member 3 may be heated by current passing through it whilst its ends are sealed in the envelope 1 so that on cooling it is held under tension. Magnetic poles are produced at points 5, 6, 7, 8 by two coils (not shown) so that the changeover reed 2 is attracted to the member 3 unless an opposing flux is applied to the device. The member 3 may be replaced by a strip with a length of non-ferromagnetic copper between its ends and magnetized at one end only.
GB1305525D 1971-03-22 1971-03-22 Expired GB1305525A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB746671 1971-03-22

Publications (1)

Publication Number Publication Date
GB1305525A true GB1305525A (en) 1973-02-07

Family

ID=9833638

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1305525D Expired GB1305525A (en) 1971-03-22 1971-03-22

Country Status (2)

Country Link
DE (1) DE2212539A1 (en)
GB (1) GB1305525A (en)

Also Published As

Publication number Publication date
DE2212539A1 (en) 1972-10-05

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees