EP1995745B1 - Vis, notamment borne électrique de démarreur, et procédé de réalisation - Google Patents

Vis, notamment borne électrique de démarreur, et procédé de réalisation Download PDF

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Publication number
EP1995745B1
EP1995745B1 EP08356071A EP08356071A EP1995745B1 EP 1995745 B1 EP1995745 B1 EP 1995745B1 EP 08356071 A EP08356071 A EP 08356071A EP 08356071 A EP08356071 A EP 08356071A EP 1995745 B1 EP1995745 B1 EP 1995745B1
Authority
EP
European Patent Office
Prior art keywords
screw
cavity
insert
transverse surface
main portion
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.)
Not-in-force
Application number
EP08356071A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1995745A1 (fr
Inventor
Gilles Charbonnier
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.)
Vis Samar
Original Assignee
Vis Samar
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 Vis Samar filed Critical Vis Samar
Priority to PL08356071T priority Critical patent/PL1995745T3/pl
Publication of EP1995745A1 publication Critical patent/EP1995745A1/fr
Application granted granted Critical
Publication of EP1995745B1 publication Critical patent/EP1995745B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • H01H1/021—Composite material
    • H01H1/025—Composite material having copper as the basic material
    • 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
    • H01H11/042—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 by mechanical deformation
    • 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
    • H01H11/06—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier
    • H01H2011/067—Fixing of contacts to carrier ; Fixing of contacts to insulating carrier by deforming, e.g. bending, folding or caulking, part of the contact or terminal which is being mounted
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/02—Non-polarised relays
    • H01H51/04—Non-polarised relays with single armature; with single set of ganged armatures
    • H01H51/06—Armature is movable between two limit positions of rest and is moved in one direction due to energisation of an electromagnet and after the electromagnet is de-energised is returned by energy stored during the movement in the first direction, e.g. by using a spring, by using a permanent magnet, by gravity
    • H01H51/065—Relays having a pair of normally open contacts rigidly fixed to a magnetic core movable along the axis of a solenoid, e.g. relays for starting automobiles
    • 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

Definitions

  • the present invention relates to a screw and a method of producing such a screw.
  • the invention applies in particular, but not exclusively, to the screws intended to form the starter electrical terminals.
  • the electrical terminal of a starter typically comprises a body - generally threaded - and a head, the latter being intended to be placed in contact with a conductive part connected to the battery, in order to allow the startup of the starter.
  • the document GB 1,284,954 proposes a screw comprising a main part made of steel, in which is made a reservation receiving an insert which may for example be copper.
  • the objective is to obtain a low cost screw, but which fulfills the required electrical functions.
  • the reservation has a bottom face forming a cone protruding towards the opening of the reservation. Due to this geometry, it is not possible to obtain a perfect filling of the reservation by pressure on the insert, the annular zone located around the base of the cone can not be properly filled. This is further accentuated by the fact that the underside of the insert has a complementary cone-shaped depression.
  • the insert consists only of a substantially cylindrical part, it is only imperfectly possible to obtain at the same time the two following results: a total filling of the reservation and the formation of an upper part in the form of a spread disc fitting on the head of the screw, outside the reservation.
  • the shallow depth of the reservation does not lead to a very good maintenance of the insert and thus increases the risk of inadvertent tearing of this insert out of the reservation.
  • the present invention aims to overcome the disadvantages mentioned above.
  • the invention relates to a screw according to claim 1.
  • the part of the head intended to come into contact with the conductive part namely the face of the insert projecting beyond the transverse face of the main part, is made of copper or alloy thus preserving the excellent properties of this material (in particular, the excellent properties of known starter terminals).
  • the cuprous alloy generally comprises more than 95% copper. It may for example contain tellurium.
  • the remainder of the screw, namely the body and the not directly electrically useful part of the head is made of a material other than copper. It is therefore possible to choose a material that while having mechanical and electrical characteristics appropriate for its use in a starter terminal, in particular, is of a lower cost.
  • a metal for example a steel.
  • an important feature of the invention is the form undercut of the reservation in the main part and the penetration of the insert throughout the space of this reservation, including the undercut area, because the ductility of copper (or cuprous alloy).
  • the insert is thus set in the reservation of the main part.
  • the reservation has a bottom face having a convex shape makes it possible to promote the creep of the copper or copper alloy constituting the insert.
  • the attachment of the insert to the main part is usually by a cold stamping.
  • the copper - or the cuprous alloy - does not have a very high deformation capacity, and it is therefore very advantageous, to obtain a complete filling of the reservation, to use a particular geometry that promotes creep of the constituent material of the insert.
  • convex bottom face is meant that the reservation has, in section, a convex contour, that is to say that the bottom of the reservation is hollow and not protruding. Thanks to this geometry, and during the assembly of the insert and the main part, the insert deforms first towards the bottom of the reservation and then, once in contact against this bottom, the insert deforms radially to the side wall against undercut to fill the entire reservation. This gives a perfect marriage between the insert and the reservation, which allows, in addition to excellent mechanical strength, to prevent the formation of arcing.
  • the bottom face of the reservation may have a convex frustoconical shape.
  • the main part comprises a substantially annular groove formed in the transverse face, around the reservation and coaxially thereto.
  • the groove may have in section a pointed form from the transverse face towards the bottom of the groove.
  • the insert may comprise a pellet made in one piece with the post, the pellet being substantially disc-shaped, of the same axis as the tenon and of larger diameter than the latter, the insert being secured to the main part so that the pastille marries the transverse face.
  • this groove is filled by the constituent material of the pellet.
  • the free transverse face of the insert - and in particular of the pellet when it is present - may comprise streaks.
  • the end face of the insert intended to come into contact with the bottom face of the reservation is, according to an advantageous embodiment, substantially flat or protruding (that is to say convex or pointed, preferably with a shape adapted to the shape of the bottom of the reservation, for example convex frustoconical). This makes it possible to promote the creep of copper or copper alloy both axially and radially.
  • the projecting lip promotes the retention of the insert in the reservation.
  • the main part of the screw is for example formed from the billet by cold forming, especially when this main part is made of steel.
  • reservation could also initially have a shape that is not perfectly cylindrical but slightly conical (slight clearance).
  • the step b 3 ) can be performed by forming in said transverse face a substantially annular groove and of the same axis as the reservation, around it, so as to locally deform the main part of the screw between the throat and the reservation and thus give a form against the left side of the reservation.
  • the form against undercut is thus obtained by a localized movement of material.
  • the introduction of the template into the reservation and the realization of the groove can be carried out by means of the same tool having a transverse face of which protrude on the one hand said cylindrical template and on the other hand an annular rib of the same axis than the template, arranged around it.
  • the groove may have in section a pointed form from the transverse face towards the bottom of the groove.
  • a screw 1 As illustrated on the figure 8 a screw 1 according to the invention consists of a main part 2 made here of steel, and an insert 3 of copper or copper alloy, secured to the main part 2.
  • the screw thus comprises a generally cylindrical body 4 and threaded, and a head 5.
  • the main part 2 is produced, starting from a piece 6 of steel, represented on the figure 1 .
  • the billet 6 comprises a generally cylindrical portion 7, which is already or will be subsequently threaded to form the body 4 of the screw 1, and a bulged portion 8 which will form part of the head 5 of the screw 1.
  • the bulged portion 8 is shaped to give it an external shape corresponding to that desired for the head 5, and to make a reservation 9.
  • the intermediate piece 10 has an axis of revolution 11 and a transverse end face 12, substantially orthogonal to the axis, and located opposite the generally cylindrical portion 7.
  • the reservation 9 is substantially cylindrical and of axis 11 , with the exception of its bottom face 13 which has a convex shape, for example a convex frustoconical shape corresponding to the shape of the tool used to create this reservation 9.
  • the reservation 9 has a substantially circular opening 14 formed in the transverse face 12.
  • the figure 3 illustrates the forming step of the intermediate part 10 leading to the formation of the main part 2.
  • a tool 15 is used which has a transverse face 16 of which project, in the direction of the intermediate part 10, on the one hand a piece forming a cylindrical template 17 and secondly an annular rib 18 of the same axis as the template 17, arranged around it.
  • the rib 18 may have a tapered section from its base towards its free end.
  • the template 17 has a height greater than that of the rib 18, and a predefined diameter, slightly smaller than that of the substantially cylindrical reservation 9 which has just been formed.
  • the tool 16 is placed on the side of the transverse face 12 of the intermediate part 10, so that the axis of the jig 17 is substantially coincident with the axis 11, and is displaced along the axis 11, in the direction of the intermediate piece 10.
  • the template 17 enters the reservation 9 while the rib 18 is still spaced from the transverse face 12.
  • the rib 18 comes into contact with the transverse face 12 and, by cold forming , comes to create a throat 19 of corresponding section.
  • the diameter of the opening 14 (that is to say the diameter of the reservation 9 at the transverse face 12) is of the order of 5 to 8 mm, in particular 6.2 mm, and the angle of inclination of the lateral face 20 of the reservation relative to the axis 11 is of the order of 15 to 20 °, for example close to 16 °.
  • the depth of the reservation is greater than 2 mm, for example close to 3 mm. This relatively large value promotes the proper anchoring of the insert 3 in the reservation 9.
  • the reservation 9 is intended to receive the insert 3, the original shape (before deformation) is illustrated on the figure 4 .
  • the insert 3 comprises a substantially disc-shaped pellet 21, from which protrudes a substantially cylindrical stud 22 having the same axis as the pellet 21 and having a diameter substantially corresponding to that of the reservation 9.
  • the diameter of the stud 22 may be close to the diameter of the opening 14 of the reservation 9 against undercut.
  • end face 27 of the post 22 opposite the pellet 21, and intended to come into contact with the bottom face 13 of the reservation 9, is substantially flat.
  • the tenon 22 of the insert 3 is placed in the reservation 9, and abuts against the bottom thereof, while the pellet 21 can rest on the transverse face 12 or be located at a distance from this face (as illustrated on the figure 4 ). Then the insert 3 is deformed by pressure, cold, by means of a suitable tool 23 (see figure 4 ), to be set in the reservation 9. The successive phases of the deformation of the insert 3 by the tool 23, until the screw 1 is obtained, are represented on the Figures 5 to 8 . The distance between the transverse face 24 of thrust of the tool 23 and the transverse face 12 of the main part 2 decreases by 0.5 mm between two successive figures.
  • the insert 3 is progressively deformed as follows. Firstly, the tenon 22, compressed against the bottom face 13 of the reservation, sees its diameter increase and its general shape pass from the cylinder to a shape coming to marry the lateral face 20 and the bottom face 13 of the reservation 9 , to fill the entire space of this reservation 9, including the area undercut. Then, when the reservation 9 is filled by the insert, the pellet 21 sees its thickness decrease and its diameter increase, until it substantially completely covers the transverse face 12 of the main part 2. In addition, the pellet 21 21 is also deformed to fill and become embedded in the throat 19.
  • the insert 3 is perfectly secured to the main part 2, the pin 22 filling the reservation 9 and the pellet 21 matching the transverse face 12, including the groove 19.
  • the head 5 of the screw 1 is thus formed by the insert 3 and a part of the main part 2.
  • the insert 3 does not consist of a single cylindrical part but a post 22 and a pellet is advantageous. Indeed, this allows these two parts of the insert 3 can undergo different deformations and perfectly fulfill their own function, namely: the total filling of the reservation for the tenon 22 and crushing and attachment to the wall transverse 12 for the pellet 21.
  • the free transverse face 25 of the pellet 21 may further comprise ridges 26, formed by the action of the tool 23 or in another way.
  • the grooves 26 are intended to avoid contact on too large a plane surface with the conductive part for starting the starter. The risks of connection between these two parts, and thus extraction of the insert 3 out of the reservation 9 when the conductive part is removed from the screw 1.
  • a second embodiment is illustrated on the Figures 9 to 11 .
  • This second embodiment is an embodiment of the invention.
  • the intermediate piece 10 comprises an annular lip 28 projecting generally axially from the face transverse 12, substantially at the periphery of the opening 14 of the reservation 9.
  • the height h of this lip 28 is for example of the order of 0.5 to 0.6 mm.
  • the intermediate part 10 is shaped so as to obtain the main part 2.
  • a tool 15 is used which comprises a substantially flat transverse face 16 from which, in the direction of the intermediate part 10, a cylindrical template 17 of predefined diameter projects, slightly less than that of the substantially cylindrical reservation 9 which has just been formed.
  • the lip 28 is deformed and folded towards the axis 11 of the main part 2.
  • the invention makes it possible to guarantee over a long service life the electrical and mechanical properties required for such a screw.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Forging (AREA)
EP08356071A 2007-05-24 2008-05-21 Vis, notamment borne électrique de démarreur, et procédé de réalisation Not-in-force EP1995745B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08356071T PL1995745T3 (pl) 2007-05-24 2008-05-21 Śruba, w szczególności zacisk elektryczny rozrusznika, i sposób wykonania

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0703681A FR2916582B1 (fr) 2007-05-24 2007-05-24 Vis,notamment borne electrique de demarreur,et procede de realisation

Publications (2)

Publication Number Publication Date
EP1995745A1 EP1995745A1 (fr) 2008-11-26
EP1995745B1 true EP1995745B1 (fr) 2012-12-19

Family

ID=38481374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08356071A Not-in-force EP1995745B1 (fr) 2007-05-24 2008-05-21 Vis, notamment borne électrique de démarreur, et procédé de réalisation

Country Status (4)

Country Link
EP (1) EP1995745B1 (pl)
ES (1) ES2401639T3 (pl)
FR (1) FR2916582B1 (pl)
PL (1) PL1995745T3 (pl)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013108520A1 (de) 2013-08-07 2015-02-12 Honsel Umformtechnik Gmbh Kontaktbolzen

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013200607A1 (de) * 2013-01-16 2014-07-17 Inovan Gmbh & Co. Kg Kontaktelement, Relais umfassend ein Kontaktelement und Verfahren zur Herstellung eines Kontaktelementes
MC200158B1 (fr) 2013-06-11 2014-07-09 Dinegro Stefano Vis pour contacts électriques
CN104347316B (zh) * 2013-07-26 2018-10-26 索恩格汽车部件德国有限公司 电磁开关及起动机
PL225180B1 (pl) 2014-03-24 2017-02-28 Gaweł Zakład Produkcji Śrub Spółka Akcyjna Śruba i sposób jej wytwarzania
US10446351B2 (en) 2017-06-06 2019-10-15 Littelfuse, Inc. Electrical contact assembly
US20230258217A1 (en) * 2022-02-11 2023-08-17 Littelfuse, Inc. Stud assembly

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US1898426A (en) * 1927-04-26 1933-02-21 Wilcox Rich Corp Method of fabricating composite metal articles
US2586336A (en) * 1948-05-01 1952-02-19 Huck Mfg Co Apparatus for and method of making tubular rivet elements
US3176329A (en) * 1964-01-08 1965-04-06 South Chester Corp Method of making partially hollow rivets and similar articles
FR2030944A5 (pl) * 1969-06-07 1970-11-13 Bosch
CH574669A5 (en) * 1973-11-28 1976-04-15 Kaludjerovic Ilija Electrical contact element with support section - has shaft extension fitting into fixing hole with changeable cross section
JPS5942580B2 (ja) * 1981-03-04 1984-10-16 株式会社日立製作所 電気接点の製造方法
DE9110356U1 (de) * 1991-08-22 1992-12-24 Robert Bosch Gmbh, 70469 Stuttgart Kontaktbolzen zum Schalten hoher Stromstärken

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013108520A1 (de) 2013-08-07 2015-02-12 Honsel Umformtechnik Gmbh Kontaktbolzen

Also Published As

Publication number Publication date
FR2916582A1 (fr) 2008-11-28
FR2916582B1 (fr) 2009-12-11
EP1995745A1 (fr) 2008-11-26
ES2401639T3 (es) 2013-04-23
PL1995745T3 (pl) 2013-08-30

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