US3567892A - Electric switches of large power comprising axially movable switching rods and resilient annular fixed contacts which are in permanent contact with said switching rods and contact strips for such fixed contacts - Google Patents

Electric switches of large power comprising axially movable switching rods and resilient annular fixed contacts which are in permanent contact with said switching rods and contact strips for such fixed contacts Download PDF

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Publication number
US3567892A
US3567892A US867796A US3567892DA US3567892A US 3567892 A US3567892 A US 3567892A US 867796 A US867796 A US 867796A US 3567892D A US3567892D A US 3567892DA US 3567892 A US3567892 A US 3567892A
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United States
Prior art keywords
contact
strip
parts
contact strip
tubular portion
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Expired - Lifetime
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US867796A
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English (en)
Inventor
Rintje Boersma
Gijsbert W Irik
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COQ NV
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COQ NV
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    • 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
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/38—Plug-and-socket contacts

Definitions

  • the invention relates to an electric switch of large power comprising an axially movable switching rod and a resilient annular fixed contact which is in permanent contact with said switching rod and is adapted to connect said switching rod electrically conductively with the circuit to be closed and opened by said switch, said fixed contacts consisting of a zigzag folded metal contact strip which is surrounded and supported by an annular holder and is bent in the shape of an uninterrupted ring, which snugly encloses the switching contact.
  • Annular fixed contacts of this kind are known in many shapes. If the folded contact strip of such a fixed contact is arranged, as is usual, with the bisectors of the angles, enclosed between its adjacent parts diverging in V-shape, in radial direction to the switching rod, the resilience of the strip is very tough and there is the risk that the contact strip does not lie with all folds at the inner circumference of the ring formed by said strip against the switching rod with substantially equal pressure and that some of said folds do not touch the switching rod at all. More over, the number of contact places between the contact strip and the switching rod and between said rod and the holder of said strip is restricted, which may lead at large currents, e.g. short circuit currents, to the burning-out of said strip.
  • the contact strip is directed with its parts in more tangential directions to the switching rod the resilience is more elastic and the number of contact places between the strip and the switching rod and between said strip and the holder can be increased, but then the cooling of the strip in the contact places appears to be worse, which may also lead to burning-out at short circuit.
  • the parts of the strip must then still join each other at the inner circumference of the contact ring somewhat in V-shape, so that the possible number of contact places is decreased again.
  • the best arrangement is always a comprise between the resilience, the number of contact places and the cooling.
  • the invention has for its object to provide a switch comprising a switching rod and a fixed contact consisting of a folded contact strip and being in permanent contact with said rod, in which the parts of the contact strip lie against the switching rod with well reproducible resilience,'the number of contact places can be large and s satisfactory cooling of said contact places is obtained.
  • the invention consists in that the said contact strip is folded in such a manner, that the parts of each individual pair of adjacent parts thereof are interconnected at the inner circumference of said ring by a portion of the contact strip which is bent in the shape of a split tube extending in the direction of the width of said strip. Consequently, the strip is bent tubularly in the contact places.
  • the fixed contact of the switch may be constructed in such a manner, that one part of each pair of adjacent parts interconnected by a tubular portion of the contact strip merges smoothly and the 7 other part thereof merges through a fold extending in the direction of the width of said strip into said tubular portion.
  • the parts of the strip come to lie near the contact places, a bit farther from the switching rod, whereby the cooling is still further improved.
  • each tubular portion interconnecting two adjacent parts of the contact strip and at least the end portions of said parts adjoining said tubular portion are curved both in the direction of the width of said strip and in a plane at right angles with the plane of said strip.
  • the movement of the switching rod through the fixed contact is facilitated and the'risk that the switching rod takes the strip along during its movement, whereby the latter is deformed in cross direction, is reduced practically to mil.
  • the invention also relates to a contact strip for the mentioned fixed contact of the described switch, said co'ntact strip being constructed in such a manner, that the parts of each individual pair of adjacent parts of the contact strip are interconnected by a portion of said strip which is bent in the shape of a split tube extending in the direction of the width of said strip. If necessary, each tubular portion interconnecting two adjacent parts of the contact strip and at least the end portions of said parts adjoining said tubular portion may be curved both in the direction of the width and in a plane at right angles with the plane of said strip.
  • FIG. 1 partly an axial sectional view, partly an elevational view of a switching rod and a fixed contact which is permanently in contact with said rod of a switch of large power according to the invention
  • FIG. 2 a cross sectional view taken on the line Il-Il in FIG.
  • FIG. 3 in perspective a portion of a contact strip for the mentioned fixed contact of such a switch
  • FIG. 4 in perspective a portion of a variant of the contact strip shown in FIG. 3 and used in the fixed contact shown in FIGS. 1 and 2;
  • FIG. 5 in perspective a portion of a variant of the contact strip shown in FIG. 4.
  • FIGS. 1 and 2 an axially movable switching rod of an electric switch of large power is designated by 1.
  • a fixed contact which consists of an annular metal holder 2 and a contact strip 3 supported by said holder.
  • the contact strip 3 consists of a zigzag folded metal strip which is bent in the shape of a ring snugly enclosing the switching rod 1.
  • the parts 3, 3" of the folded strip 3 extends closely and almost parallel to each other in pairs and they are directed nealy tangentially to the switching rod 1 (see FIG. 2).
  • the two parts 3', 3 of each pair of substantially parallel parts are interconnected at the inner circumference of the ring formed by the strip 3 by a portion 4 of the strip which is bent in the shape of a split tube.
  • the strip 3 is resiliently forced against the switching rod 1 with the tubular portions 4.
  • the tubular shape of the strip 3 in the contact places between the fixed contact 2, 3 and the switching rod 1 improves the cooling in said places.
  • tubular portion 4 of the strip 3 is symmetrically positioned in respect of the parts 33" interconnected by said portion 4.
  • the tubular portion 4' is asymmetrically positioned in such a manner, that the part 3' merges smoothly and the part 3" merges through a fold 5 extending in the direction of the width of said strip into said tubular portion 4'. Due to this construction a somewhat better cooling of the contact places is obtained.
  • tubular portion 4" and the end portion of the parts 3', 3" of the contact strip adjoining said portion 4" are somewhat curved in the direction of the width and transversely to the plane of the strip. Owing thereto the edges of the strip come to lie against the switching rod 1 with little or no pressure, so that it is avoided, that during the movement of the switching rod said edges of the strip scrape over the surface of said rod, whereby the switching rod could be damaged and the contact strip could be taken along with the switching rod through a small distance.
  • An electric switch of large power comprising an axially movable switching rod, a resilient annular fixed contact which is in permanent contact with said switching rod to connect same with the circuit to be closed and opened by the switch, an annular holder and a zigzag folded metal contact strip which is surrounded and supported by said holder and bent in the shape of an uninterrupted ring that snugly encloses said switching rod, said holder and said contact strip constituting together said fixed contact, the parts of each individual pair of adjacent parts of sad contact strip interconnected at the inner circumference of said ring by a portion of said contact strip which is bent in the shape of a longitudinally split tube extending in the direction of the width of said contact strip.
  • each tubular portion interconnecting two adjacent parts of said contact strip and at least the end portions of said parts adjoining said tubular portion are curved both in the direction of the width of and at right angles with said parts.
US867796A 1969-04-15 1969-10-20 Electric switches of large power comprising axially movable switching rods and resilient annular fixed contacts which are in permanent contact with said switching rods and contact strips for such fixed contacts Expired - Lifetime US3567892A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6905749A NL6905749A (ja) 1969-04-15 1969-04-15

Publications (1)

Publication Number Publication Date
US3567892A true US3567892A (en) 1971-03-02

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ID=19806686

Family Applications (1)

Application Number Title Priority Date Filing Date
US867796A Expired - Lifetime US3567892A (en) 1969-04-15 1969-10-20 Electric switches of large power comprising axially movable switching rods and resilient annular fixed contacts which are in permanent contact with said switching rods and contact strips for such fixed contacts

Country Status (9)

Country Link
US (1) US3567892A (ja)
JP (1) JPS502068B1 (ja)
AT (1) AT295640B (ja)
BE (1) BE738895A (ja)
DE (1) DE1945895B2 (ja)
FR (1) FR2039174A1 (ja)
GB (1) GB1222919A (ja)
NL (2) NL6905749A (ja)
SE (1) SE367731B (ja)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751619A (en) * 1971-07-01 1973-08-07 Bbc Brown Boveri & Cie Electrical contact structure of the plug-and-socket type circuit breakers
US3997747A (en) * 1972-11-20 1976-12-14 Westinghouse Electric Corporation Circuit interrupter
US4462657A (en) * 1980-04-18 1984-07-31 Eaton Corporation Compliant electrical connector for flat conductors
CN102610404A (zh) * 2011-01-21 2012-07-25 Abb技术有限公司 用于导电体的接触系统
WO2016001328A1 (en) * 2014-07-02 2016-01-07 Eaton Industries (Netherlands) B.V. Circuit breaker

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4260868A (en) * 1978-11-29 1981-04-07 Day Industrial Research Corporation Current carrying reciprocable fluid motor
US4538019A (en) * 1984-04-30 1985-08-27 United Technologies Corporation Grounding of a control rod extending through an opening in a structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3751619A (en) * 1971-07-01 1973-08-07 Bbc Brown Boveri & Cie Electrical contact structure of the plug-and-socket type circuit breakers
US3997747A (en) * 1972-11-20 1976-12-14 Westinghouse Electric Corporation Circuit interrupter
US4462657A (en) * 1980-04-18 1984-07-31 Eaton Corporation Compliant electrical connector for flat conductors
CN102610404A (zh) * 2011-01-21 2012-07-25 Abb技术有限公司 用于导电体的接触系统
WO2016001328A1 (en) * 2014-07-02 2016-01-07 Eaton Industries (Netherlands) B.V. Circuit breaker

Also Published As

Publication number Publication date
NL135150C (ja)
JPS502068B1 (ja) 1975-01-23
DE1945895A1 (de) 1970-10-29
BE738895A (ja) 1970-02-16
FR2039174A1 (ja) 1971-01-15
NL6905749A (ja) 1970-10-19
SE367731B (ja) 1974-06-04
AT295640B (de) 1972-01-10
DE1945895B2 (de) 1971-10-14
GB1222919A (en) 1971-02-17

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