US2802923A - Resilient contacts for use in weakcurrent apparatus - Google Patents

Resilient contacts for use in weakcurrent apparatus Download PDF

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Publication number
US2802923A
US2802923A US497774A US49777455A US2802923A US 2802923 A US2802923 A US 2802923A US 497774 A US497774 A US 497774A US 49777455 A US49777455 A US 49777455A US 2802923 A US2802923 A US 2802923A
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US
United States
Prior art keywords
nickel
contacts
resilient
stainless steel
bronze
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
US497774A
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English (en)
Inventor
Weijer Berend
Draijer Jannes
Ball Leslie Claude
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.)
US Philips Corp
North American Philips Co Inc
Original Assignee
US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US2802923A publication Critical patent/US2802923A/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
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/04—Co-operating contacts of different material

Definitions

  • the invention relates to resilient contacts for use in weak-current apparatus, such as amplifiers, radio and television receivers.
  • the said resilient contacts have to satisfy the requirements, that they have constant and low contactresistances are wear-resistant and adapted to be soldered. An even more important requirement is that the contact does not give rise to phenomena which inradio or television receivers cause so-called crackling. These requirements must be satisfied even after frequent use and if the contacts are exposed for long periods of time to an atmosphere containing hydrogen sulphide, sulphur dioxide or salt.
  • Resilient contacts are known one part of which consists of silver-plated copper whilst the other part consists of Phosphor-bronze coated with a silver layer.
  • These contacts have a limitation in that in course of time sulphide settles on the silver and causes crackling. Therefore it has been suggested to replace the silver by other metals, such as rhodium, gold, palladium or combinations or alloys of these metals.
  • other metals such as rhodium, gold, palladium or combinations or alloys of these metals.
  • Resilient contact part Non-resilient contact part Phosphor-bronze Copper Phosphor-bronze-l-lO Ni Copper+ln Ni Plnlslphor-bronze 2014 Cu 2n Phosphor-bronze+20n Ag+2u Or Phosphor-bronze+0.5 Rh
  • resilient contacts for use in weak-current apparatus are composed of two parts, one of which consists of stainless steel coated with nickel Whilst the other consists either of nickel or of nickel coated on stainless steel, nickel being the contact metal. 7
  • stainless steel in prolonged experiment it was found that the stainless steel cannot be replaced by other materials, such as, for example, iron or normal steel or Phosphor-bronze so that the contacts satisfy practicalrequirements. Consequently, the invention does not relate to other metals than stainless steel.
  • the term stainless steel as used herein is to be understood to mean chromium-nickel-iron alloys, preferably an alloy containing in addition to iron 18% of chromium and 8% of nickel.
  • Nickel can be coated on stainless steel in various manners, for example by plating.
  • the nickel is deposited on the steel by electro-deposition. This may be done in the following manner.
  • Components for resilient contacts made of 18-8 chromium-nickel steel are degreased by means of trichlorethylene and subsequently by means of a hot solution of caustic soda. Thereupon the components are pickled with the use of hot concentrated hydrochloric acid and Washed with water. Then the articles are activated anodically for a short period of time by treating them in a bath of concentrated hydrochloric acid which is saturated with nickel chloride so that the surface is coated with a very thin nickel layer. The nickel bath is then replaced by another bath containing 240 g. of nickel sulphate, 40 g. of nickel chloride and 30 g. of boric acid per litre. In this bath the components are connected as the cathode and thus coated with a nickel layer 1011. thick.
  • the resilient contacts in accordance with the invention have proved to be particularly suited for use in so-called wave switches for use in radio and television receivers.
  • a resilient contact of the class described comprising at least two parts, one part constituted of stainless steel coated with nickel and the other part constituted of nickel, the nickel being the contact metal.
  • a resilient contact of the class described comprising at least two parts, one part being of stainless steel constituted of 18% chromium, 8% nickel and the remainder of iron and coated with nickel, and the other part being nickel, said nickel layer being deposited on said stainless steel by electro-deposition and being from between 2 to 20 thick.

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  • Contacts (AREA)
  • Electroplating Methods And Accessories (AREA)
US497774A 1954-03-31 1955-03-29 Resilient contacts for use in weakcurrent apparatus Expired - Lifetime US2802923A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL328873X 1954-03-31

Publications (1)

Publication Number Publication Date
US2802923A true US2802923A (en) 1957-08-13

Family

ID=19784269

Family Applications (1)

Application Number Title Priority Date Filing Date
US497774A Expired - Lifetime US2802923A (en) 1954-03-31 1955-03-29 Resilient contacts for use in weakcurrent apparatus

Country Status (7)

Country Link
US (1) US2802923A (is")
BE (1) BE536959A (is")
CH (1) CH328873A (is")
DE (1) DE1029955B (is")
FR (1) FR1121436A (is")
GB (1) GB767479A (is")
NL (1) NL85511C (is")

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1093867B (de) * 1958-08-07 1960-12-01 Siemens Ag Schalter oder Stecker mit schleifendem Kontakt
US3211856A (en) * 1963-01-14 1965-10-12 Continental Motors Corp Low fluid level cut-off switch
DE3431476A1 (de) * 1983-08-26 1985-03-07 GTE Valeron Corp., Troy, Mich. Elektrische kontaktanordnung fuer eine tastsonde
US4934968A (en) * 1986-12-22 1990-06-19 Amp Incorporated Nickel plated contact surface having preferred crystallographic orientation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5563563A (en) * 1995-12-04 1996-10-08 Ford Motor Company Solenoid with an improved contact design and a system utilizing the solenoid
US6338746B1 (en) * 1999-07-23 2002-01-15 Rlc Technologies, L.L.C. Polymer-sulfur-polymer coated fertilizers

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US883554A (en) * 1906-10-24 1908-03-31 Henri Maillard Sparking device.
US1925856A (en) * 1930-08-08 1933-09-05 Westinghouse Electric & Mfg Co Contact terminal
US2547947A (en) * 1946-06-17 1951-04-10 Fansteel Metallurgical Corp Contact assembly

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL17519C (is") * 1925-10-07
NL39212C (is") * 1933-07-26

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US883554A (en) * 1906-10-24 1908-03-31 Henri Maillard Sparking device.
US1925856A (en) * 1930-08-08 1933-09-05 Westinghouse Electric & Mfg Co Contact terminal
US2547947A (en) * 1946-06-17 1951-04-10 Fansteel Metallurgical Corp Contact assembly

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1093867B (de) * 1958-08-07 1960-12-01 Siemens Ag Schalter oder Stecker mit schleifendem Kontakt
US3211856A (en) * 1963-01-14 1965-10-12 Continental Motors Corp Low fluid level cut-off switch
DE3431476A1 (de) * 1983-08-26 1985-03-07 GTE Valeron Corp., Troy, Mich. Elektrische kontaktanordnung fuer eine tastsonde
US4934968A (en) * 1986-12-22 1990-06-19 Amp Incorporated Nickel plated contact surface having preferred crystallographic orientation

Also Published As

Publication number Publication date
NL85511C (is")
BE536959A (is")
FR1121436A (fr) 1956-08-14
GB767479A (en) 1957-02-06
CH328873A (de) 1958-03-31
DE1029955B (de) 1958-05-14

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