EP0011413A1 - Schalter - Google Patents

Schalter Download PDF

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Publication number
EP0011413A1
EP0011413A1 EP79302380A EP79302380A EP0011413A1 EP 0011413 A1 EP0011413 A1 EP 0011413A1 EP 79302380 A EP79302380 A EP 79302380A EP 79302380 A EP79302380 A EP 79302380A EP 0011413 A1 EP0011413 A1 EP 0011413A1
Authority
EP
European Patent Office
Prior art keywords
switch
contact member
plunger
movable contact
fixed contact
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Withdrawn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
EP79302380A
Other languages
English (en)
French (fr)
Inventor
Frederick Charles Ayres
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.)
Bonnella Switches Ltd
Original Assignee
Bonnella Switches 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 Bonnella Switches Ltd filed Critical Bonnella Switches Ltd
Publication of EP0011413A1 publication Critical patent/EP0011413A1/de
Withdrawn legal-status Critical Current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
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/34—Contacts characterised by the manner in which co-operating contacts engage by abutting with provision for adjusting position of contact relative to its co-operating contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/02—Details
    • H01H13/12—Movable parts; Contacts mounted thereon

Definitions

  • This invention relates to a switch, more particularly to a switch of the push button type.
  • a push button switch having two fixed contact members and a movable contact member biased towards the fixed contacts by means of a spring.
  • the fixed contact members comprise aligned portions of conductive material which provide the fixed contacts and the movable contact member takes the form of a generally planar conductive bridge member which provides an electrical pathway between the fixed contacts in the closed condition of the switch.
  • the plunger of the push button which is slidably mounted between the fixed contact members so as to be movable in a . direction substantially perpendicular to the plane of the fixed contacts, is depressed so as to bear against the movable contact member and move it bodily away from the fixed contacts.
  • switches of this type make and break at only one of the fixed contacts.
  • the switch is to be used to carry a reasonably high current, for example a stop lamp switch for a vehicle, it is necessary that the fixed contacts and also the corresponding contacts on the mble contact member must be made of fine silver the like so that it matters not at which of the fixed contacts making and breaking of the electrical pathway through the switch occurs This factor adds significantly to the cost of the manufacture of such a switch,
  • the present invention accordingly seeks to provide a switch of the push button type in which it can be reliably predicted at which of the fixed contacts making and breaking of the electrical pathway through the switch will occur and which can be manufactured for moderately high current density usage significantly more cheaply than the known design by requiring the use of a single set only of fine silver contacts or the like in place of the two sets of the known design.
  • the invention thus provides a switch comprising first and second fixed contact members, a movable contact member for bridging the fixed contacts and providing an electrically conductive pathway therebetween in the closed condition of the switch, biasing means for biasing the movable contact member towards engagement with the fixed contact members, ani a plunger arranged to bear on the movable contact member so as to pivot it relative to a predetermined one of the fixed contact members at least during the initial travel of the plunger during actuation thereof and so that making and breaking of the electrical pathway through the switch occurs between the other fixed contact member and the movable contact member.
  • the switch of the invention can be designed for high current density usage utilising a single set only of fine silver contacts or the like in place of the two sets required by the prior art design of switch.
  • This set of fine silver contacts or the like comprises the fixed contact at which making and breaking of the electrical pathway through the switch occurs and the corresponding moving contact on the movable contact member. It is not necessary to provide a set of fine silver contacts or the like at the pivot point between the movable contact member and the said one fixed contact.
  • the plunger is constructed to slide substantially without rotation about its axis and is formed with a nib which bears against the movable contact member asymmetrically with respect to the fixed contacts.
  • the movable contact member is made to pivot about the pivot point between it and the fixed contact that is further from the nib and making and breaking of the electrical pathway through the switch occurs between it (the movable contact member) and the other fixed contact.
  • the nib may be formed in any convenient manner; for example, the plunger may be formed with an angled face that is inclined obliquely the plunger axis, the nib being formed where this angled face intersects the longitudinal surface of the plunger.
  • the movable contact member is provided with a surface that, in the closed condition of the switch lies oblique to the axis of the plunger and intersects its path whilst the plunger preferably has an abutment surface substantially perpendicular to the plunger axis.
  • the biasing means comprises a compression spring.
  • a push button switch comprises a housing 1 having a first fixed contact member 2 and a second fixed contact member 3 mounted therein.
  • a movable contact member 4 is biased towards the fixed contact members 2 and 3 by means of a spring 5.
  • movable contact member 4 is provided with a pair of contacts 6, 7, whilst fixed contact member 2 has a contact 8 formed thereon.
  • a plunger 9 is formed at one end with a projecting pin 10 which passes through a cut out in movable contact member 4 and serves to locate it in the housing 1.
  • Plunger 9 is non-circular in section, e.g. it is of D-section or of square section, and slides in an aperture in housing 1 of appropriate cross-section; in this way plunger 9 cannot rotate about its axis.
  • the plunger 9 has an angled face 12 forming at one side of the plunger 9 a nib 13.
  • Figure 2 shows the closed condition of the switch with the movable contact member 4 bridging the fixed contact member 2 and 3 and completing an electrical pathway therebetween.
  • the plunger moves to open the switch, i.e. to the left as illustrated, the nib 13 abuts against movable contact member 4 as shown in Figure 3. Since nib 13 is positioned asymmetrically with respect to the fixed contact members 2 and 3 and lies closer to contact 6 than contact 7, the movable contact member 4 pivots about contact 7 and the electrical pathway is broken between contacts 6 and 8.
  • FIG 5 is a detail side view of part of a modified form of vehicle stop lamp switch.
  • the switch body (indicated at 14) has an externally threaded projection 15 which can be passed through a suitable aperture in a vehicle body and retained therein by means of a corresponding nut (not shown).
  • plunger 9 is of D-section and slides in a corresponding guideway in projection 15.
  • the interior construction of the switch of Figures 5 and 6 is identical to that of Figures 1 to 4.
  • the switch of Figures 7 and 8 has an interior construction that is identical to that of Figures 1 to 4
  • the body 16 of the switch of Figures 7 and 8 has a face plate 17 and is formed with a pair of external projections or "pips" 18.
  • This construction enables the switch body to be pressed home into a suitable aperture in a vehicle body until the face plate 17 lies flush with the surface around the aperture, whereupon it is retained in the aperture by projections 18.
  • the plunger 9 is of square section to prevent rotation about its axis.
  • Figure 9 shows an alternative construction.
  • the fixed contacts 21, 22 are bridged by generally L-shaped movable contact member 23 which is biased towards engagement with the fixed contact members 21, 22 by means of a compression spring 24 and is retained by means of a retainer lug 25 on plunger 26.
  • Plunger 26 has a projection 27, which passes through a cut-out in movable contact member 23, and a transverse face 28 which is substantially perpendicular to the plunger axis.
  • Movable contact 29 and fixed contact 30 are made of fine silver or the like.
  • Leg 31 of member 23 bears against fixed contact member 21 whilst the upright of the L presents a face 32 towards face 28 of plunger 26.
  • plunger 26 In operation of the switch, plunger 26 is moved (leftwards as illustrated) until contact occurs between it and face 32 of member 23 as indicated at 33. Since point 33 lies further from leg 31 than from movable contact 29, further movement leftwards of plunger 26 causes member 23 to pivot about the pivot point 34 between its leg 31 and fixed contact 21 and contacts 29 and 30 to break contact.
  • Plunger 26 can be of circular section in this embodiment.
  • the switch of Figures 10 and 11 is generally similar to that of Figure 9 and similar parts have similar reference numerals in Figures 10 and 11 to those of Figure 9.
  • the movable contact member 23 is bent somewhat more in the embodiment of Figure 10 than that of Figure 9; thus it is bent to the shape of a numeral 7 rather than being L-shaped.
  • fixed contact 21 is formed with a lip 35.
  • switch pivot point 34 can move somewhat along lip 35, e.g. to the position 34' shown in Figure 11, as plunger 26 is actuated, due to the interference between leg 31 of movable contact member 23 and lip 35. In this way any tendency for breaking of the electrical pathway through the switch to occur at contact 21 rather than at contact 22 is obviated.
  • leg 31 any tendency of leg 31 to bounce during actuation is overcome.
  • movement of pivot point 34 along lip 35 has a wiping action that helps to keep clean the contact areas between leg 31 and fixed contact member 21.
  • the lip 35 is so formed that in the closed condition of the switch as illustrated in Figure 10 the leg 31 and lip 35 are tightly pulled together.
  • switches illustrated are single pole switches it will be appreciated by those skilled in the art that the invention can readily be adapted for use in double pole or multi pole switches.

Landscapes

  • Push-Button Switches (AREA)
EP79302380A 1978-11-03 1979-10-31 Schalter Withdrawn EP0011413A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4313678 1978-11-03
GB7843136 1978-11-03

Publications (1)

Publication Number Publication Date
EP0011413A1 true EP0011413A1 (de) 1980-05-28

Family

ID=10500790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79302380A Withdrawn EP0011413A1 (de) 1978-11-03 1979-10-31 Schalter

Country Status (3)

Country Link
EP (1) EP0011413A1 (de)
JP (1) JPS5569917A (de)
ES (1) ES486131A1 (de)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0252285A1 (de) * 1986-06-03 1988-01-13 Aktieselskabet Laur. Knudsen Nordisk Elektricitets Selskab Elektrischer Schalter
DE3628423A1 (de) * 1986-08-21 1988-02-25 Kloeckner Moeller Elektrizit Kontaktanordnung fuer elektrische schaltgeraete
EP0613162A2 (de) * 1993-02-26 1994-08-31 Cesare Gallone Verbindungsvorrichtung zwischen den Kontakten elektrischer Schalter und dergleichen
WO2000036619A1 (en) * 1998-12-15 2000-06-22 Luxder Llc A switching arrangement comprising a contact-bearing lamina apt to be inclined towards one or more positions
US6695640B2 (en) * 2001-04-05 2004-02-24 Ge Medical Systems Global Technology Company, Llc Ultrasonic diagnostic equipment
US6784390B2 (en) * 2002-08-30 2004-08-31 Defond Manufacturing Limited Electrical switch
FR2868874A1 (fr) * 2004-04-09 2005-10-14 Itt Mfg Enterprises Inc Commutateur electrique du type normalement ferme
JP2015118864A (ja) * 2013-12-19 2015-06-25 大塚工機株式会社 検知スイッチ

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE952194C (de) * 1952-11-15 1956-11-15 Franz Kirsten Fa OElbremsdruckschalter
FR1510980A (fr) * 1966-12-12 1968-01-26 Unelec Appareil électrique à double coupure
DE2613690A1 (de) * 1976-03-31 1977-10-13 Bayerische Motoren Werke Ag Tuerschalter, insbesondere fuer kraftfahrzeuge
DE2724530A1 (de) * 1977-05-31 1978-12-14 Teves Gmbh Alfred Druckabhaengiger, elektrischer schalter

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE952194C (de) * 1952-11-15 1956-11-15 Franz Kirsten Fa OElbremsdruckschalter
FR1510980A (fr) * 1966-12-12 1968-01-26 Unelec Appareil électrique à double coupure
DE2613690A1 (de) * 1976-03-31 1977-10-13 Bayerische Motoren Werke Ag Tuerschalter, insbesondere fuer kraftfahrzeuge
DE2724530A1 (de) * 1977-05-31 1978-12-14 Teves Gmbh Alfred Druckabhaengiger, elektrischer schalter

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0252285A1 (de) * 1986-06-03 1988-01-13 Aktieselskabet Laur. Knudsen Nordisk Elektricitets Selskab Elektrischer Schalter
DE3628423A1 (de) * 1986-08-21 1988-02-25 Kloeckner Moeller Elektrizit Kontaktanordnung fuer elektrische schaltgeraete
EP0613162A2 (de) * 1993-02-26 1994-08-31 Cesare Gallone Verbindungsvorrichtung zwischen den Kontakten elektrischer Schalter und dergleichen
EP0613162A3 (de) * 1993-02-26 1995-02-01 Cesare Gallone Verbindungsvorrichtung zwischen den Kontakten elektrischer Schalter und dergleichen.
WO2000036619A1 (en) * 1998-12-15 2000-06-22 Luxder Llc A switching arrangement comprising a contact-bearing lamina apt to be inclined towards one or more positions
US6695640B2 (en) * 2001-04-05 2004-02-24 Ge Medical Systems Global Technology Company, Llc Ultrasonic diagnostic equipment
US6784390B2 (en) * 2002-08-30 2004-08-31 Defond Manufacturing Limited Electrical switch
FR2868874A1 (fr) * 2004-04-09 2005-10-14 Itt Mfg Enterprises Inc Commutateur electrique du type normalement ferme
WO2005098883A1 (en) * 2004-04-09 2005-10-20 Itt Manufacturing Enterprises, Inc. Electrical switch of the normally closed type
JP2015118864A (ja) * 2013-12-19 2015-06-25 大塚工機株式会社 検知スイッチ

Also Published As

Publication number Publication date
JPS5569917A (en) 1980-05-27
ES486131A1 (es) 1980-06-16

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB IT SE

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19810318

RIN1 Information on inventor provided before grant (corrected)

Inventor name: AYRES, FREDERICK CHARLES