US3721929A - Electrical switch devices - Google Patents

Electrical switch devices Download PDF

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Publication number
US3721929A
US3721929A US00017507A US3721929DA US3721929A US 3721929 A US3721929 A US 3721929A US 00017507 A US00017507 A US 00017507A US 3721929D A US3721929D A US 3721929DA US 3721929 A US3721929 A US 3721929A
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US
United States
Prior art keywords
magnetic
reed
control means
switch
electrical switch
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
US00017507A
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English (en)
Inventor
R Gabriel
R Kinross
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.)
Communications Patents Ltd
Original Assignee
Communications Patents Ltd
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 Communications Patents Ltd filed Critical Communications Patents Ltd
Application granted granted Critical
Publication of US3721929A publication Critical patent/US3721929A/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
    • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
    • H01H36/0006—Permanent magnet actuating reed switches
    • H01H36/006—Permanent magnet actuating reed switches comprising a plurality of reed switches, e.g. selectors or joystick-operated

Definitions

  • the invention provides an electrical switch device comprising a plurality of magnetically operable reed switch elements each of which is disposed in a channel of conductive material which includes two magnetically permeable members arranged one each side of the reed switch element thereby simultaneously to provide both electrostatic and electromagnetic screening for said reed switch element and a control means associated with at least one reed switch element whereby the magnetic actuation of said element is rendered ineffective.
  • control means is formed by a magnetically permeable member associated with the reed switch element to form a magnetic shield so preventing actuation of its contacts by the operating magnet.
  • control means is formed by an auxiliary reed arranged electrically in series with the reed switch element, said auxiliary reed being operable by a magnetic member associated therewith.
  • the magnetic member is a permanently magnetized member arranged to be releasably positioned on or adjacent said auxiliary reed.
  • FIG. 1 is a cross-sectional view of one embodiment of a switch device in accordance with the present invention.
  • FIG. 2 is a schematic diagram of another embodiment of an electrical switch device in accordance with the present invention.
  • each channel including two magnetically permeable members 2 arranged one on each side of the reed switch element and associated with a member of non-magnetically permeable conductive material formed by a sheet of copper 3 which is bonded to one face of a sheet 4 of insulating material.
  • the members 3, 4 may be formed from a so-called printed circuit panel.
  • the magnetically permeable members 2 are secured in the insulating material 4 by means of portions 5 thereof which extend through corresponding apertures in the members 3, 4 and which are suitably deformed so as to thereafter prevent their withdrawal.
  • each magnetically permeable member 2 comprises a pair of sheets of magnetizable material and each member is common to the channels associated with'adjacent ones of the reed switch elements 1.
  • the reed switch elements I are actuable by. a permanent magnet 6 carried by a movable arm 7 which serves to position the magnet 6 over that reed switch element which is desired to be actuated at any particular time.
  • reed switch elements 1 and magnetically permeable members 2 are arranged to extend readily from a common center, the arm 7 being pivoted on an axis passing through said center and rotatable over the reed switch elements 1.
  • a control means is associated with one of the reed switch elements in order to render ineffective the magnetic actuation of said element.
  • the control means comprises a bridge 8 of magnetically permeable material releasably engaged in the channel defined between two of the members 2 and forms a magnetic shield which prevents actuation of the contacts of the reed switch element concerned by the magnet 6.
  • the bridge 8 or a plurality thereof may be manually associated with one or more of the reed switch elements. When these elements together form a programme selection switch corresponding to a particular subscriber in a wired broadcasting system that subscriber may be denied certain of the available programmes. If at any time the subscriber is to be permitted to receive one of the denied programmes the bridge 8 is simply removed from the channel housing the reed switch element corresponding to that programme so as to restore its normal operation.
  • reed switch elements 10 of the kind shown in FIG. 1 are arranged to be actuated by a movable magnet such as the magnet 6 shown in FIG. 1. Actuation of one of the reed switch elements 10 serves to establish a circuit path between one of the input terminals 11 and the output terminals 12 from which a subscriber of a wired broadcasting system may derive selected programme signals. Resistors l3 serve as isolating impedances to prevent undue interference to other subscribers of the system in the event of a fault occuring associated with the subscriber connected to the terminals 12. Arranged electrically in series with each of the reed switch elements 10 is an auxiliary reed 14 the contacts of which are normally closed.
  • the appropriate auxiliary reed 14 may have placed on or adjacent thereto a magnet member 15 the magnetic field of which serves to actuate the auxiliary reed so opening its contact. It will be appreciated that if the subscribers reed switch elements 10 associated with that programme are closed upon his.
  • the magnet member 15 is arranged to be releasably positioned on or adjacent the desired auxiliary reed 14 by means for example of a clip fitted thereto which may be engaged with the body of an auxiliary reed 14. Again it is a simple matter to permit a subscriber to receive a denied programme simply by unclipping the magnet member 15 from the auxiliary reed l4 concerned.
  • auxiliary reeds 14 may be actuated by electromagnets and that in this case control of the actuation thereof may be effected automatically and/or remotely.
  • An electrical switch device comprising a plurality of magnetically operable reed switch elements each of which is disposed in a channel of conductive material which includes two magnetically permeable members arranged one on each side of the reed switch element thereby simultaneously to provide both electrostatic and electromagnetic screening for said reed switch element, magnetic means selectively positionable adjacent to said elements to actuate magnetically any one of said switch elements when adjacent thereto, and a control means associated with at least one reed switch element whereby the magnetic actuation of said at least one element by said magnetic means is rendered ineffective, wherein the control means comprises a magnetically permeable member associated with the reed switch element to form a magnetic shield so preventing actuation of its contacts by the operating magnet.
  • control means comprises a bridge of magnetically permeable material releasably engaged in the channel defined between said two magnetically permeable members.
  • control means to render ineffective selectively single ones of said switches when scanned by said magnetic means, comprising in combination, control means comprising a removable member of magnetic material stationarily positionable selectively in a position associated with said single switch to render ineffective said single switch when scanned by said magnetic means.

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  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
US00017507A 1970-08-28 1971-08-26 Electrical switch devices Expired - Lifetime US3721929A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4153870 1970-08-28

Publications (1)

Publication Number Publication Date
US3721929A true US3721929A (en) 1973-03-20

Family

ID=10420158

Family Applications (1)

Application Number Title Priority Date Filing Date
US00017507A Expired - Lifetime US3721929A (en) 1970-08-28 1971-08-26 Electrical switch devices

Country Status (14)

Country Link
US (1) US3721929A (es)
AU (1) AU463747B2 (es)
BE (1) BE771854A (es)
CA (1) CA950012A (es)
CH (1) CH532834A (es)
DE (1) DE2142340A1 (es)
ES (1) ES200696Y (es)
FR (1) FR2112204B1 (es)
GB (1) GB1354501A (es)
IL (1) IL37571A (es)
MT (1) MTP703B (es)
NL (1) NL7111747A (es)
SE (1) SE388500B (es)
ZA (1) ZA715663B (es)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54131969U (es) * 1979-02-01 1979-09-12
US4213854A (en) * 1978-02-27 1980-07-22 Stekly Zdenek J J Magnetic separating apparatus with magnetic shielding means
US4408101A (en) * 1980-10-30 1983-10-04 Marcamor, Inc. Automatic telephone dialing apparatus with magnetic switch assembly
US4554422A (en) * 1982-09-29 1985-11-19 Ab Electronic Components Limited Gearbox indicator switch
US5811892A (en) * 1996-10-22 1998-09-22 Kcs Industries, Inc. Power supply system including mechanical output switches for use with a plurality of display tubes
US6262647B1 (en) * 2000-10-23 2001-07-17 William P. Rogers Magnetic reed switching array

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128027B (en) * 1982-10-01 1985-11-06 Electronic Components Ltd Gearbox indicator switch
GB2129218A (en) * 1982-09-29 1984-05-10 Electronic Components Ltd Direction indicator cancellation device
DE3345822A1 (de) * 1983-12-17 1985-06-27 Josef Heinrichs Meßgeräte, 5000 Köln Elektrische schalteinrichtung fuer den einsatz in explosionsgefaehrdeten bereichen

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3337825A (en) * 1966-03-14 1967-08-22 Brooks William Repeat-cycle switch having an electric motor driving a reciprocating actuator for a plurality of electrical switches
US3505869A (en) * 1968-04-17 1970-04-14 Us Air Force Apparatus for measuring fluid level in a container
US3564468A (en) * 1968-06-20 1971-02-16 Telemecanique Electrique Apparatus for controlling electric circuits by the effect of a plurality of members influenced by a magnetic field and arranged in parallel

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3337825A (en) * 1966-03-14 1967-08-22 Brooks William Repeat-cycle switch having an electric motor driving a reciprocating actuator for a plurality of electrical switches
US3505869A (en) * 1968-04-17 1970-04-14 Us Air Force Apparatus for measuring fluid level in a container
US3564468A (en) * 1968-06-20 1971-02-16 Telemecanique Electrique Apparatus for controlling electric circuits by the effect of a plurality of members influenced by a magnetic field and arranged in parallel

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4213854A (en) * 1978-02-27 1980-07-22 Stekly Zdenek J J Magnetic separating apparatus with magnetic shielding means
JPS54131969U (es) * 1979-02-01 1979-09-12
US4408101A (en) * 1980-10-30 1983-10-04 Marcamor, Inc. Automatic telephone dialing apparatus with magnetic switch assembly
US4554422A (en) * 1982-09-29 1985-11-19 Ab Electronic Components Limited Gearbox indicator switch
US5811892A (en) * 1996-10-22 1998-09-22 Kcs Industries, Inc. Power supply system including mechanical output switches for use with a plurality of display tubes
US6262647B1 (en) * 2000-10-23 2001-07-17 William P. Rogers Magnetic reed switching array

Also Published As

Publication number Publication date
IL37571A0 (en) 1971-11-29
CH532834A (de) 1973-01-15
CA950012A (en) 1974-06-25
SE388500B (sv) 1976-10-04
FR2112204A1 (es) 1972-06-16
ES200696Y (es) 1976-01-16
ES200696U (es) 1975-09-01
BE771854A (fr) 1971-12-31
DE2142340A1 (de) 1972-03-02
ZA715663B (en) 1972-04-26
IL37571A (en) 1974-09-10
GB1354501A (en) 1974-06-05
AU3270071A (en) 1973-03-01
NL7111747A (es) 1972-03-01
FR2112204B1 (es) 1973-06-29
MTP703B (en) 1972-02-23
AU463747B2 (en) 1975-08-07

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