Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/02—Contact members
  • H01R13/03—Contact members characterised by the material, e.g. plating, or coating materials
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/28—Clamped connections, spring connections
  • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
  • H01R13/02—Contact members
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
  • H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
  • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
  • H01R43/16—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for manufacturing contact members, e.g. by punching and by bending

Definitions

• the present invention relates to the field of terminal screws, that is to say screws with an electrical conduction function.
• the present invention relates to the field of screws designed to provide intermittent electrical contact in the ignition circuit of an internal combustion engine.
• the screws intended for this application were made of a homogeneous material, for example entirely of copper, bronze or steel.
• the specifications imposed for terminal screws have become more stringent in recent years. Resistance to electrical contact and higher sparking is thus required, to guarantee less wear on the electric arcs. It is also required a higher mechanical resistance to allow to admit higher tightening torques than in the past. Finally, it is generally required the passage of an electric current of higher intensity and therefore a higher electrical conduction.
• bi-material screws that is to say screws whose main body is made of steel, but with a hollow head suitable for brazing a wafer made of an alloy of silver / tungsten brazed on the head.
• the object of the present invention is now to propose a new terminal screw capable of meeting strict specifications, and of acceptable cost.
• the object of the present invention is in particular to propose a terminal screw meeting the following specifications: - mechanical resistance greater than 580MPa,
• a one-piece terminal screw characterized in that it is made of a copper alloy based on Cu, Ni, Si.
• the terminal screw is produced using an alloy comprising of the order of 97% copper, 2 to 5% nickel, typically 2.5% and 0 , 3 to 1% silicon, typically 0.5%.
• the terminal screw 10 according to the present invention is in one piece and formed from a homogeneous material based on a copper nickel silicon alloy.
• the screw 10 in accordance with the present invention is produced based on an alloy comprising of the order of 97% copper, 2 to 5% nickel, typically 2.5% and from 0.3 to 1% of silicon, typically 0.5%.
• the screw 10 is made from a circular wire of constant section and a cold strike, for example two strokes.
• the screw is preferably subjected to a heat treatment for two hours at a temperature of the order of 475 ° C., followed by quenching with water.
• the threaded body or rod 12 has a length of the order of 30 to 35 mm and a diameter of the order of 8mm.
• the rod or body 12 can be adapted to be engaged directly in a tapped bore.
• the screw is immobilized using a nut engaged on the end of the threaded rod 12.
• the screw 10 further comprises a flared head 16 whose cross section is non-circular in revolution to allow an anti-rotation function, for example by engagement in a complementary recess formed in the contactor cover.
• the head 16 may have a cross section of diverse geometry, for example square, hexagonal, or any other equivalent non-circular shape of revolution.
• the dimensions of the head 16 can be the subject of numerous variants. Typically the head 16 has a height of the order of 5mm (considered parallel to the axis 14) and dimensions of the order of 13x10mm for a head of rectangular section.
• the upper surface 18 of the head 16, that is to say the surface perpendicular to the axis 14 and ensuring the electrical contacting function is preferably flat, without burrs and rough striking. It is important that it has no concavity. It can thus be at least slightly convex, convex. In addition it is smooth.
• edges of the head 16 both parallel to the axis 14 and perpendicular to this axis are preferably rounded with an average radius of the order of 0.40 to 0.50mm.
• the terminal screw 10 according to the present invention is preferably made from a circular wire.
• the method of manufacturing the terminal screw 10 in accordance with the present invention essentially comprises three phases.
• the first phase consists of drawing the circular wire unwound from the original coil to obtain the desired diameter and mechanical strength.
• This step is typically carried out to obtain, according to a particular and nonlimiting embodiment, a wire meeting the following characteristics:
• the second step is to strike the wire, to obtain the desired geometry of the screw and work hardening. It is preferably a cold strike, for example two strokes.
• the third step is to operate a heat treatment to obtain adequate mechanical strength and electrical conductivity.
• the heat treatment is carried out by maintaining at a temperature of the order of 475 ° C. for two hours, that is to say maintaining the parts at constant temperature then rapid cooling with air, see oil, preferably water.
• the parts can be cleaned before use.

Landscapes

• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Conductive Materials (AREA)
• Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
• Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
• Manufacturing Of Electrical Connectors (AREA)
• Ignition Installations For Internal Combustion Engines (AREA)
• Transmission Devices (AREA)
• Forging (AREA)
• Connection Of Batteries Or Terminals (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (1)

Family

ID=29558819

Family Applications (1)

Country Status (14)

Cited By (1)

Families Citing this family (1)

Citations (3)

Family Cites Families (5)

• 2002
  • 2002-05-29 FR FR0206583A patent/FR2840460B1/fr not_active Expired - Fee Related
• 2003
  • 2003-05-27 GB GB0426180A patent/GB2405752B/en not_active Expired - Fee Related
  • 2003-05-27 CA CA002487051A patent/CA2487051A1/fr not_active Abandoned
  • 2003-05-27 CZ CZ20041150A patent/CZ20041150A3/cs unknown
  • 2003-05-27 US US10/516,355 patent/US20060162827A1/en not_active Abandoned
  • 2003-05-27 DE DE10392730T patent/DE10392730T5/de not_active Withdrawn
  • 2003-05-27 MX MXPA04011773A patent/MXPA04011773A/es active IP Right Grant
  • 2003-05-27 JP JP2004508453A patent/JP2005528744A/ja not_active Withdrawn
  • 2003-05-27 BR BR0311405-8A patent/BR0311405A/pt not_active IP Right Cessation
  • 2003-05-27 AU AU2003263231A patent/AU2003263231A1/en not_active Abandoned
  • 2003-05-27 KR KR1020047019404A patent/KR20050026927A/ko not_active Withdrawn
  • 2003-05-27 CN CNA038121867A patent/CN1656656A/zh active Pending
  • 2003-05-27 WO PCT/FR2003/001596 patent/WO2003100912A1/fr not_active Ceased
• 2004
  • 2004-11-29 SE SE0402893A patent/SE0402893A0/sv unknown

Patent Citations (3)

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