FR2438907A1 - Magnetically controlled knife-switch - allows easy concealment and reduces possibility of tampering by positioning switch contacts and magnetic control in axial alignment - Google Patents

Magnetically controlled knife-switch - allows easy concealment and reduces possibility of tampering by positioning switch contacts and magnetic control in axial alignment

Info

Publication number
FR2438907A1
FR2438907A1 FR7828729A FR7828729A FR2438907A1 FR 2438907 A1 FR2438907 A1 FR 2438907A1 FR 7828729 A FR7828729 A FR 7828729A FR 7828729 A FR7828729 A FR 7828729A FR 2438907 A1 FR2438907 A1 FR 2438907A1
Authority
FR
France
Prior art keywords
contacts
switch
door
tampering
leaf
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.)
Withdrawn
Application number
FR7828729A
Other languages
French (fr)
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.)
FRANQUEVILLE PHILIPPE
Original Assignee
FRANQUEVILLE PHILIPPE
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 FRANQUEVILLE PHILIPPE filed Critical FRANQUEVILLE PHILIPPE
Priority to FR7828729A priority Critical patent/FR2438907A1/en
Publication of FR2438907A1 publication Critical patent/FR2438907A1/en
Withdrawn legal-status Critical Current

Links

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
    • H01H36/0013—Permanent magnet actuating reed switches characterised by the co-operation between reed switch and permanent magnet; Magnetic circuits
    • 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

  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)

Abstract

The knife switch comprises two leaf contacts (4) sealed in a glass phial (3) which is in turn embedded in resin (5) in a small diameter cylindrical tube (6). One leaf contact is electrically connected to an L-shaped member (1) of magnetically permeable material embedded in the resin outside the phial (3) with its longer limb substantially parallel to the leaf contacts (4) and its shorter limb crossing the phial axis adjacent one end of the tube (6). The longer limb projects from the other tube end as does a terminal for the other leaf contact. When the switch is embedded in a door jamb, for example, with a magnet (2) in the door edge, and the door is closed the field is drawn parallel with the contacts (4) by the member (1) and the contacts close by magnetic attraction. Opening the door removes the field and the contacts open. External tampering with the switch is virtually impossible.
FR7828729A 1978-10-09 1978-10-09 Magnetically controlled knife-switch - allows easy concealment and reduces possibility of tampering by positioning switch contacts and magnetic control in axial alignment Withdrawn FR2438907A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7828729A FR2438907A1 (en) 1978-10-09 1978-10-09 Magnetically controlled knife-switch - allows easy concealment and reduces possibility of tampering by positioning switch contacts and magnetic control in axial alignment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7828729A FR2438907A1 (en) 1978-10-09 1978-10-09 Magnetically controlled knife-switch - allows easy concealment and reduces possibility of tampering by positioning switch contacts and magnetic control in axial alignment

Publications (1)

Publication Number Publication Date
FR2438907A1 true FR2438907A1 (en) 1980-05-09

Family

ID=9213485

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7828729A Withdrawn FR2438907A1 (en) 1978-10-09 1978-10-09 Magnetically controlled knife-switch - allows easy concealment and reduces possibility of tampering by positioning switch contacts and magnetic control in axial alignment

Country Status (1)

Country Link
FR (1) FR2438907A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0122694A1 (en) * 1983-04-19 1984-10-24 KONTAKTA, Alkatrészgyár Control switch and limiter
WO1989012310A1 (en) * 1988-06-03 1989-12-14 Bernard Danglot Electric or electronic control keyboard

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0122694A1 (en) * 1983-04-19 1984-10-24 KONTAKTA, Alkatrészgyár Control switch and limiter
WO1989012310A1 (en) * 1988-06-03 1989-12-14 Bernard Danglot Electric or electronic control keyboard

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Legal Events

Date Code Title Description
ST Notification of lapse