US3562467A - Electrical contact - Google Patents

Electrical contact Download PDF

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Publication number
US3562467A
US3562467A US830433A US3562467DA US3562467A US 3562467 A US3562467 A US 3562467A US 830433 A US830433 A US 830433A US 3562467D A US3562467D A US 3562467DA US 3562467 A US3562467 A US 3562467A
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US
United States
Prior art keywords
metal
shank
head
solder
layer
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
US830433A
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English (en)
Inventor
Victor G Mooradian
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.)
BASF Catalysts LLC
Engelhard Minerals and Chemicals Corp
Original Assignee
Engelhard Minerals and Chemicals 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 Engelhard Minerals and Chemicals Corp filed Critical Engelhard Minerals and Chemicals Corp
Application granted granted Critical
Publication of US3562467A publication Critical patent/US3562467A/en
Assigned to ENGELHARD CORPORATION reassignment ENGELHARD CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PHIBRO CORPORATION, A CORP. OF DE
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
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/041—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion
    • H01H11/045—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by bonding of a contact marking face to a contact body portion with the help of an intermediate layer

Definitions

  • both the shank and the backing layer including the under surface and the peripheral sides of the backing layer being coated with a layer of metal solder having a lower melting point than the contact metal, the backing layer and the shank.
  • the bimetallic head undergoes a distortion such that the peripheral marginal portions of the head adjacent the contact arm separate from the surface of the contact arm at least partly about the circumference of the head effecting a bent distortion, e.g. curling of the contact metal layer, which seriously affects the performance of the contact.
  • the present invention contemplates the provision of an electrical contact and contact assembly which obviates such disadvantages.
  • an electrical contact of the rivet type comprising a metal head and a metal shank, the head being a bimetallic head composed of a layer of contact metal, e.g. silver, and a backing layer of a different metal, e.g. copper from which extends the rivet shank and which shank is preferably of the same metal composition as the backing layer, both the peripheral surfaces of the shank and the backing layer including the undersurface of an the peripheral sides of the backing layer being coated with a layer of solder having a melting point lower than that of the contact metal, the backing layer and the shank.
  • the thickness of the solder coat layer is between the range of 0.005 and 0.0002 inches, preferably between 0.003 and 0.0005 inches.
  • the criticality of the invention lies in the particular thickness of solder coat as well as the combination including such solder thickness and the above-mentioned surfaces coated with the solder layer.
  • solder was applied to a thickness exceeding about 0.005 inches, during subsequent heating there would be some solder in the solder layer at the interface in unalloyed condition with the adjacent metals thereby providing an unsatisfactorily weak bond. Otherwise, a lot of the solder would, during melting, exude from between adjacent surfaces and contaminate the contact surface.
  • FIG. 1 illustrates a partly cross-sectional and partly elevational side view of an electrical contact according to the invention
  • FIG. 2 illustrates a fragmentary elevational side view of a contact assembly
  • FIG. 3 illustrates a cross-sectional view of F IG. 2.
  • the electrical contact of the invention is in the form of a rivet having a rivet head 1 and a rivet shank 2.
  • the rivet head is preferably in the form of a bimetallic head having a surface layer 3 composed of contact metal, e.g. silver, silver alloy, a platinum group metal especially platinum or palladium, gold or a gold alloy, or a tungsten-molybdenum alloy.
  • the contact metal surface layer is mounted on a backing layer 4 composed ofa metal different from the contact metal, e.g. a base metal such as copper, bronze, brass, nickel or steel, and the shank 2 extends from the backing layer thereby forming a rivet shape.
  • the sides 5 of shank 2, the bottom surface 6 of backing layer 4 and the peripheral surface 7 of the backing layer are coated with a layer 8 of solder having a melting point lower than that of the contact metal 3 the backing layer 4 and the core metal of shank 2.
  • the thickness of the solder coat layer is preferably between the range of about 0.003 and 0.0005 inch.
  • the criticality of the invention lies in the combination of the solder coated surfaces as well as the thickness of the solder coat.
  • the solder layer 8 is composed of solder alloys such as l5 percent Agpercent Cu-5 percent P; 35 percent Ag-26 percent Cu-2l percent Znl8 percent Cd; 45 percent Ag-IS percent Cu-l6 percent Zn-24 percent Cd; 5 percent Ag-l 6.6 percent Zn78.4 percent Cd; 5 percent Agpercent Cd; 56 percent Ag-22 percent Cu-l7 percent Zn-5 percent Sn.
  • solder alloys such as l5 percent Agpercent Cu-5 percent P; 35 percent Ag-26 percent Cu-2l percent Znl8 percent Cd; 45 percent Ag-IS percent Cu-l6 percent Zn-24 percent Cd; 5 percent Ag-l 6.6 percent Zn78.4 percent Cd; 5 percent Agpercent Cd; 56 percent Ag-22 percent Cu-l7 percent Zn-5 percent Sn.
  • the rivet type contact may be formed in known manner, for example, as disclosed in US. Pat. No. 3,208,l29, and while the solder layer 8 may be applied as an alloy sheath on a base metal wire core prior to forming the bimetallic head I, it can also be provided by alternately electroplating layers of different metals such as silver, copper, zinc, tin, etc. on the base metal wire core prior to forming the rivet head and then allowing the solder to be formed from these layers during hot staking onto the contact arm 9 or by passing the cold staked rivet through a controlled temperature as in an oven.
  • a metal contact strip or arm 9 e.g. an arm of copper, bronze, brass or steel, is provided with an aperture formed therethrough and defined by aperture wall 10.
  • the rivet of FIG. 1 is inserted into the aperture with the solder layer 8 coating the bottom surface 6 of the backing layer 4 abutting one side of the strip or arm adjacent the aperture and the free end of the shank 2 extending out of the aperture. Thereafter, the free end portion 11 (FIG. I) of the rivet is deformed into a second retaining head 12 having an inner solder coated face 13 in abutment with the opposite side of the arm adjacent the aperture to form a contact assembly.
  • the rivet is mounted in the arm 9 aperture and the end portion 11 is hot staked to form the retaining head 12 by the use of well-known electrically heating electrodes (not shown) having die cavities contoured to contain the head 1 while shaping the head 12 into its headlike convex head.
  • electrically heating electrodes not shown
  • the solder layer 8 being present in the above-stated critical range of thickness, the solder melts and alloys with the metal of side 5 of shank 2 and the metal of the aperture walls 10, as well as between the metal of the undersurface 6 of back 4 and the portion of the contact am 9 underlying the head I and also forming a small annular fillet 14 between the periphery of the backing layer 4 and the contact arm due to the flow of solder 8b from the peripheral sides of the backing layer.
  • the rivets may also be applied by cold staking after which the solder can be melted to form the joint by passing the assembly through an oven under controlled temperature conditions.
  • An electrical contact of the rivet type comprising a metal head and a metal shank extending from one side of the head, the shank, and the side of the head adjacent the shank having coated thereon layer of metal solder having a lower melting point than the metal of the head and the metal of the shank, the metal solder layer having a thickness between about 0.005 to about 0.0002 inch.
  • the head is a bimetallic head composed of a surface layer of contact metal bonded to a backing layer of a metal different from the contact metal, and said metal solder layer extending over the peripheral surface of the said backing layer.
  • An electrical contact assembly comprising an electrical contact of the rivet type having a metal head and a metal shank joined to the head, the shank, and the side of the head adjacent the shank having coated thereon a layer of metal solder having a lower melting point than the metal of the head and the metal of the shank, the metal solder layer having a thickness between about 0.003 and 0.0005 inch, a metal arm having an aperture therethrough defined by the aperture wall.
  • the shank of the rivet passing through the aperture with the solder-coated side of the head adjacent the shank abutting one side of the arm adjacent the aperture, the free end of the shank being staked in abutment with the opposite side of the arm adjacent the aperture, the solder being in heat alloyed condition as a soldered bond between the head of the rivet and the metal of the arm adjacent the aperture and between the rivet shank and the wall defining the arm aperture.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Contacts (AREA)
  • Manufacture Of Switches (AREA)
US830433A 1969-06-04 1969-06-04 Electrical contact Expired - Lifetime US3562467A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US83043369A 1969-06-04 1969-06-04

Publications (1)

Publication Number Publication Date
US3562467A true US3562467A (en) 1971-02-09

Family

ID=25257001

Family Applications (1)

Application Number Title Priority Date Filing Date
US830433A Expired - Lifetime US3562467A (en) 1969-06-04 1969-06-04 Electrical contact

Country Status (4)

Country Link
US (1) US3562467A (enrdf_load_stackoverflow)
DE (1) DE2027282A1 (enrdf_load_stackoverflow)
FR (1) FR2052477A5 (enrdf_load_stackoverflow)
GB (1) GB1254095A (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2280965A1 (fr) * 1974-08-01 1976-02-27 Hooker Chemicals Plastics Corp Dispositif de commutation pour fortes intensites a contacts d'arc bimetalliques
US4071720A (en) * 1976-06-17 1978-01-31 Motorola, Inc. Binary coded cam selector switch having split housing and dent structure
EP0033644A1 (en) * 1980-02-05 1981-08-12 Plessey Overseas Limited Intermetallic connector finishes
US4345130A (en) * 1979-12-21 1982-08-17 Tokyo Shibaura Denki Kabushiki Kaisha Electrical contact
US4408110A (en) * 1978-03-31 1983-10-04 Societe De Vente De L'aluminium Pechiney Aluminum electrical contacts and method of making same
US5268237A (en) * 1991-10-28 1993-12-07 Chugai Denki Kogyo K.K. Composite electrical contact
DE19740022A1 (de) * 1997-09-11 1999-03-04 Siemens Ag Kontaktstück und Verfahren zu dessen Befestigung auf einem Träger
US20060278507A1 (en) * 2003-04-22 2006-12-14 Gerhard Renner Contact piece made of tungsten provided with a corrosion-resistant layer made of a base metal
US20100252311A1 (en) * 2009-04-01 2010-10-07 Advanced Interconnections Corp. Terminal assembly with regions of differing solderability
WO2013020659A1 (de) * 2011-08-08 2013-02-14 Volkswagen Aktiengesellschaft Verbindung zumindest zweier aneinander anliegender bauteile mittels eines stifförmigen verbindungselementes durch reibschweissen
US8969734B2 (en) 2009-04-01 2015-03-03 Advanced Interconnections Corp. Terminal assembly with regions of differing solderability
US20190277436A1 (en) * 2018-03-12 2019-09-12 Frank Seth Gaunce Copper Plumbing Pinhole Prevention; Pinhole Repair and Protection for Long Life of Copper Plumbing
US10714285B2 (en) * 2018-05-24 2020-07-14 Safran Electrical & Power Electromechanical switching device utilizing contacts on aluminum conductors and method of adhesion
CN113168971A (zh) * 2018-11-30 2021-07-23 三菱电机株式会社 电接触件及其制造方法
DE102021106393A1 (de) 2021-03-16 2022-09-22 Te Connectivity Germany Gmbh Anordnung zur Herstellung einer Diffusionslötverbindung zwischen einem elektrisch leitenden Kontaktelement und einem Werkstück

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3230197B2 (ja) 1994-08-30 2001-11-19 三菱電機株式会社 回路遮断器
RU2136979C1 (ru) * 1997-11-28 1999-09-10 Корпорация "Промисинг Фьюче корпорэйшн" Стержневой крепежный элемент
DE102019133891A1 (de) * 2019-12-11 2021-06-17 Profil Verbindungstechnik Gmbh & Co. Kg Funktionselement

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2280965A1 (fr) * 1974-08-01 1976-02-27 Hooker Chemicals Plastics Corp Dispositif de commutation pour fortes intensites a contacts d'arc bimetalliques
US4071720A (en) * 1976-06-17 1978-01-31 Motorola, Inc. Binary coded cam selector switch having split housing and dent structure
US4408110A (en) * 1978-03-31 1983-10-04 Societe De Vente De L'aluminium Pechiney Aluminum electrical contacts and method of making same
US4345130A (en) * 1979-12-21 1982-08-17 Tokyo Shibaura Denki Kabushiki Kaisha Electrical contact
EP0033644A1 (en) * 1980-02-05 1981-08-12 Plessey Overseas Limited Intermetallic connector finishes
US5268237A (en) * 1991-10-28 1993-12-07 Chugai Denki Kogyo K.K. Composite electrical contact
DE19740022A1 (de) * 1997-09-11 1999-03-04 Siemens Ag Kontaktstück und Verfahren zu dessen Befestigung auf einem Träger
US7339127B2 (en) * 2003-04-22 2008-03-04 Louis Renner Gmbh Contact piece made of tungsten provided with a corrosion-resistant layer made of a base metal
US20060278507A1 (en) * 2003-04-22 2006-12-14 Gerhard Renner Contact piece made of tungsten provided with a corrosion-resistant layer made of a base metal
US20100252311A1 (en) * 2009-04-01 2010-10-07 Advanced Interconnections Corp. Terminal assembly with regions of differing solderability
US8119926B2 (en) * 2009-04-01 2012-02-21 Advanced Interconnections Corp. Terminal assembly with regions of differing solderability
US8969734B2 (en) 2009-04-01 2015-03-03 Advanced Interconnections Corp. Terminal assembly with regions of differing solderability
WO2013020659A1 (de) * 2011-08-08 2013-02-14 Volkswagen Aktiengesellschaft Verbindung zumindest zweier aneinander anliegender bauteile mittels eines stifförmigen verbindungselementes durch reibschweissen
US20190277436A1 (en) * 2018-03-12 2019-09-12 Frank Seth Gaunce Copper Plumbing Pinhole Prevention; Pinhole Repair and Protection for Long Life of Copper Plumbing
US10436373B2 (en) * 2018-03-12 2019-10-08 Frank Seth Gaunce Copper plumbing pinhole prevention; pinhole repair and protection for long life of copper plumbing
US10714285B2 (en) * 2018-05-24 2020-07-14 Safran Electrical & Power Electromechanical switching device utilizing contacts on aluminum conductors and method of adhesion
CN113168971A (zh) * 2018-11-30 2021-07-23 三菱电机株式会社 电接触件及其制造方法
CN113168971B (zh) * 2018-11-30 2022-07-22 三菱电机株式会社 电接触件及其制造方法
DE102021106393A1 (de) 2021-03-16 2022-09-22 Te Connectivity Germany Gmbh Anordnung zur Herstellung einer Diffusionslötverbindung zwischen einem elektrisch leitenden Kontaktelement und einem Werkstück

Also Published As

Publication number Publication date
DE2027282A1 (de) 1970-12-10
GB1254095A (en) 1971-11-17
FR2052477A5 (enrdf_load_stackoverflow) 1971-04-09

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ENGELHARD CORPORATION 70 WOOD AVENUE SOUTH, METRO

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PHIBRO CORPORATION, A CORP. OF DE;REEL/FRAME:003968/0801

Effective date: 19810518