EP0044757A1 - Verfahren zur Verringerung der bei der Betätigung eines elektrischen Schalters verursachten Funkstörungen - Google Patents

Verfahren zur Verringerung der bei der Betätigung eines elektrischen Schalters verursachten Funkstörungen Download PDF

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Publication number
EP0044757A1
EP0044757A1 EP81400957A EP81400957A EP0044757A1 EP 0044757 A1 EP0044757 A1 EP 0044757A1 EP 81400957 A EP81400957 A EP 81400957A EP 81400957 A EP81400957 A EP 81400957A EP 0044757 A1 EP0044757 A1 EP 0044757A1
Authority
EP
European Patent Office
Prior art keywords
contacts
craters
reducing
switch
electric 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.)
Granted
Application number
EP81400957A
Other languages
English (en)
French (fr)
Other versions
EP0044757B1 (de
Inventor
Georges Duhamel
Yves Boisot
Daniel Bontemps
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.)
ELECTRO MECANIQUE DU NIVERNAIS SELNI Ste
Original Assignee
Electromecanique du Nivernais Selni Ste
Thomson-Brandt SA
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 Electromecanique du Nivernais Selni Ste, Thomson-Brandt SA filed Critical Electromecanique du Nivernais Selni Ste
Priority to AT81400957T priority Critical patent/ATE11708T1/de
Publication of EP0044757A1 publication Critical patent/EP0044757A1/de
Application granted granted Critical
Publication of EP0044757B1 publication Critical patent/EP0044757B1/de
Expired 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
    • H01H1/06—Contacts characterised by the shape or structure of the contact-making surface, e.g. grooved

Definitions

  • the present invention relates to an electrical switch with contact break at negligible level of radio interference.
  • contact break switches A large number of electrical devices are controlled by contact break switches.
  • Known contact breakers usually include contacts with a smooth smooth surface. During the closing of these contacts, the movable contact approaches the fixed contact and when the ignition distance is reached, an arc occurs and generates parasites as long as the contacts are not completely closed. When these contacts open, an arc appears as soon as a small spacing of the contacts has occurred. This arc gives rise to parasites and only extinguishes when the movable contact is distant from the fixed contact by a length greater than the ignition distance. Thus the switching operations performed by these known switches usually produce annoying radio interference.
  • the contacts are provided with a divided surface in the form of heterogeneous striations or asperities in points. This embodiment makes it possible to avoid to a certain extent a bonding or a welding of these contacts but cannot prevent an annoying creation of radioelectric disturbance.
  • the aim of the present invention is to avoid these drawbacks and makes it possible to produce an economical electrical switch with contact breakage having a negligible level of radio interference.
  • an electrical switch with contact breakage having a negligible level of radioelectric disturbances comprises at least one of the contacts provided in its surface with a rough area, constituted by a multitude of craters.
  • the switch 1 comprises a base 2 in which are mounted a fixed contact 3 on a fixed support 4 and a movable contact 5 on an elastic blade 6 for example that of the known type, provided a central tab.
  • the opening and closing of these two contacts 3 and 5 are performed by an insulating finger 7 which controls the position of the elastic blade 6 carrying the movable contact 5.
  • a screw 8 mounted in the base 2 acts as a stop and ensures the adjustment of the spacing of the movable contact 5 by relative to the fixed contact 3, in their opening.
  • At least one of the fixed 3 and movable 5 contacts has a surface comprising at least one rough area.
  • This rough surface area has a multitude of small craters 9.
  • These craters 9 have a dimension of the order of several microns to a few hundred microns. Thanks to this particular surface condition of these contacts 3 and 5, their opening or closing generates radiographic disturbances only to a negligible level.
  • a comparative test illustrated in FIGS. 5 to 7 makes it possible to highlight the advantages provided by the switches produced according to the invention compared with known switches, provided with contacts of the conventional type with a smooth and smooth surface and divided surface.
  • FIGS. 7 and 8 illustrate the parasites generated by the separation of contacts with a rough surface consisting of craters according to the invention.
  • the craters on the surface of these two contacts 3 and 5 are obtained by stamping.
  • an anvil with imprint produced by electro-erosion is used.
  • the contacts thus formed can be either welded to their support as shown in FIG. 3 or crimped onto the latter as shown in FIG. 4.
  • the insulating finger 7 which actuates the contacts 3 and 5 can be controlled manually or automatically.
  • the finger 7 is controlled by means of a capsule filled with a thermodilatable fluid.

Landscapes

  • Contacts (AREA)
  • Noise Elimination (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Push-Button Switches (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Circuits Of Receivers In General (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Manufacture Of Switches (AREA)
  • Keying Circuit Devices (AREA)
  • Switch Cases, Indication, And Locking (AREA)
EP81400957A 1980-07-11 1981-06-16 Verfahren zur Verringerung der bei der Betätigung eines elektrischen Schalters verursachten Funkstörungen Expired EP0044757B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT81400957T ATE11708T1 (de) 1980-07-11 1981-06-16 Verfahren zur verringerung der bei der betaetigung eines elektrischen schalters verursachten funkstoerungen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8015494A FR2486706A1 (fr) 1980-07-11 1980-07-11 Interrupteur electrique a rupture de contacts a niveau negligeable de perturbations radioelectriques
FR8015494 1980-07-11

Publications (2)

Publication Number Publication Date
EP0044757A1 true EP0044757A1 (de) 1982-01-27
EP0044757B1 EP0044757B1 (de) 1985-02-06

Family

ID=9244119

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400957A Expired EP0044757B1 (de) 1980-07-11 1981-06-16 Verfahren zur Verringerung der bei der Betätigung eines elektrischen Schalters verursachten Funkstörungen

Country Status (7)

Country Link
EP (1) EP0044757B1 (de)
JP (1) JPS5749127A (de)
AT (1) ATE11708T1 (de)
DE (1) DE3168752D1 (de)
DK (1) DK154373C (de)
ES (1) ES268148Y (de)
FR (1) FR2486706A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60105204A (ja) * 1983-11-14 1985-06-10 カルソニックカンセイ株式会社 可変抵抗器の製造方法とその製造装置
CA2873854C (en) 2012-05-18 2018-02-06 Honda Motor Co., Ltd. Switching electrode and resistance welding device using same, spot welding device and spot welding method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490020A (en) * 1946-02-11 1949-12-06 First Ind Corp Electrical contact
FR981352A (fr) * 1944-08-04 1951-05-25 Merlin Gerin Perfectionnements aux contacts électriques
FR59947E (fr) * 1950-01-13 1954-09-21 Merlin Gerin Perfectionnements aux contacts électriques
GB877674A (en) * 1959-09-30 1961-09-20 Gerhard Muller Improvements in or relating to co-operating electrical contacts engageable by relative sliding displacement
FR1345137A (fr) * 1962-10-26 1963-12-06 Perfectionnement aux contacts pour régulateurs de tension ou d'intensité utilisables plus particulièrement sur véhicules automobiles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR981352A (fr) * 1944-08-04 1951-05-25 Merlin Gerin Perfectionnements aux contacts électriques
US2490020A (en) * 1946-02-11 1949-12-06 First Ind Corp Electrical contact
FR59947E (fr) * 1950-01-13 1954-09-21 Merlin Gerin Perfectionnements aux contacts électriques
GB877674A (en) * 1959-09-30 1961-09-20 Gerhard Muller Improvements in or relating to co-operating electrical contacts engageable by relative sliding displacement
FR1345137A (fr) * 1962-10-26 1963-12-06 Perfectionnement aux contacts pour régulateurs de tension ou d'intensité utilisables plus particulièrement sur véhicules automobiles

Also Published As

Publication number Publication date
EP0044757B1 (de) 1985-02-06
ATE11708T1 (de) 1985-02-15
JPS5749127A (en) 1982-03-20
FR2486706A1 (fr) 1982-01-15
DE3168752D1 (en) 1985-03-21
ES268148Y (es) 1983-11-16
ES268148U (es) 1983-05-01
DK308981A (da) 1982-01-12
DK154373B (da) 1988-11-07
DK154373C (da) 1989-04-10
FR2486706B1 (de) 1984-04-20

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