EP1995745B1 - Screw, in particular a starter electric terminal and manufacturing method - Google Patents

Screw, in particular a starter electric terminal and manufacturing method Download PDF

Info

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)
French (fr)
Other versions
EP1995745A1 (en
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/en
Publication of EP1995745A1 publication Critical patent/EP1995745A1/en
Application granted granted Critical
Publication of EP1995745B1 publication Critical patent/EP1995745B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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)

Description

La présente invention concerne une vis ainsi qu'un procédé de réalisation d'une telle vis.The present invention relates to a screw and a method of producing such a screw.

L'invention s'applique notamment, mais non exclusivement, aux vis destinées à former les bornes électriques de démarreur.The invention applies in particular, but not exclusively, to the screws intended to form the starter electrical terminals.

La borne électrique d'un démarreur comprend typiquement un corps - généralement fileté - et une tête, cette dernière étant destinée à être mise en contact avec une pièce conductrice reliée à la batterie, afin de permettre la mise en route du démarreur.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.

La plupart des bornes électriques connues sont réalisées intégralement en cuivre ou en alliage cuivreux. En effet, ce matériau est bon conducteur électrique et offre en outre l'avantage de ne pas subir de détérioration importante du fait de l'arc électrique produit lors du contact entre la tête de la borne et la pièce conductrice. Toutefois, le cuivre (ou alliage cuivreux) est un matériau très onéreux.Most known electrical terminals are made entirely of copper or copper alloy. Indeed, this material is good electrical conductor and also offers the advantage of not suffering significant deterioration because of the electric arc produced during the contact between the terminal head and the conductive part. However, copper (or cuprous alloy) is a very expensive material.

Afin d'abaisser le coût de telles bornes, il a été envisagé d'utiliser d'autres matériaux conducteurs, mais il s'avère que les bornes obtenues ne donnent pas entière satisfaction, notamment en termes de résistance mécanique et/ou de durée de vie.In order to lower the cost of such terminals, it has been envisaged to use other conductive materials, but it turns out that the terminals obtained are not entirely satisfactory, especially in terms of mechanical strength and / or duration of life.

Le document GB 1 284 954 propose une vis comprenant une partie principale en acier, dans laquelle est réalisée une réservation recevant un insert pouvant par exemple être en cuivre. L'objectif est d'obtenir une vis de coût réduit, mais qui remplisse les fonctions électriques requises.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.

Cependant, la vis décrite dans ce document n'est pas pleinement satisfaisante pour les raisons suivantes.However, the screw described in this document is not fully satisfactory for the following reasons.

Tout d'abord, la réservation présente une face de fond formant un cône en saillie vers l'ouverture de la réservation. Du fait de cette géométrie, il n'est pas possible d'obtenir un remplissage parfait de la réservation par pression sur l'insert, la zone annulaire située autour de la base du cône ne pouvant être convenablement comblée. Cela est en outre accentué par le fait que la face inférieure de l'insert présente un creux en forme de cône complémentaire.First, 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.

Or, il est fondamental d'obtenir une liaison intime entre l'insert et la partie principale. En effet, si tel n'est pas le cas, d'une part la tenue mécanique de l'insert dans la réservation n'est pas assurée et il existe donc un risque important de détachement de l'insert et, d'autre part, en fonctionnement, des arcs électriques peuvent se produire dans l'espace non comblé, ce qui n'est évidemment pas souhaitable.Now, it is fundamental to obtain an intimate connection between the insert and the main part. Indeed, if this is not the case, firstly the mechanical strength of the insert in the reservation is not ensured and there is therefore a significant risk of detachment of the insert and secondly , in operation, Electric arcs can occur in the unfilled space, which is obviously not desirable.

Par ailleurs, l'insert étant constitué uniquement d'une partie sensiblement cylindrique, on ne peut qu'imparfaitement obtenir à la fois les deux résultats suivants : un remplissage total de la réservation et la formation d'une partie supérieure en forme de disque étalé s'encastrant sur la tête de la vis, à l'extérieur de la réservation.Moreover, since 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.

Enfin, la faible profondeur de la réservation ne conduit pas à un très bon maintien de l'insert et accentue donc les risques d'arrachement intempestif de cet insert hors de la réservation.Finally, 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.

La présente invention vise à remédier aux inconvénients mentionnés ci-dessus.The present invention aims to overcome the disadvantages mentioned above.

A cet effet, et selon un premier aspect, l'invention concerne une vis selon la revendication 1.For this purpose, and according to a first aspect, the invention relates to a screw according to claim 1.

Ainsi, d'une part, la partie de la tête destinée à venir en contact avec la pièce conductrice, à savoir la face de l'insert faisant saillie au-delà de la face transversale de la partie principale, est réalisée en cuivre ou alliage cuivreux et conserve donc les excellentes propriétés de ce matériau (en particulier, les excellentes propriétés des bornes de démarreur connues). L'alliage cuivreux comprend généralement plus de 95 % de cuivre. Il peut par exemple contenir du tellure. D'autre part, le reste de la vis, à savoir le corps et la partie non directement électriquement utile de la tête, est réalisé en un matériau autre que le cuivre. Il est donc possible de choisir un matériau qui, tout en possédant des caractéristiques mécaniques et électriques appropriées à son utilisation dans une borne de démarreur, notamment, est d'un coût moindre. En particulier, on peut utiliser un métal, par exemple un acier. Dans ce cas, on peut également réaliser facilement un filetage qui aura une bien meilleure tenue mécanique qu'un filetage réalisé dans un corps en cuivre.Thus, on the one hand, 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. On the other hand, 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. In particular, it is possible to use a metal, for example a steel. In this case, it is also possible to easily make a thread which will have a much better mechanical strength than a thread made in a copper body.

Par ailleurs, une caractéristique importante de l'invention est la forme en contre dépouille de la réservation ménagée dans la partie principale et la pénétration de l'insert dans tout l'espace de cette réservation, y compris la zone en contre dépouille, du fait de la ductilité du cuivre (ou de l'alliage cuivreux). L'insert se trouve donc serti dans la réservation de la partie principale.Furthermore, 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.

On obtient ainsi plusieurs avantages. D'une part, cela permet d'assurer une très bonne solidarisation entre l'insert et la partie principale de la vis. En effet, dans le cas de l'application à une borne électrique de démarreur, lors du passage de courant entre la pièce conductrice et la tête de la borne, il peut se produire des microsoudures tendant à associer ces deux pièces entre elles. Grâce à la caractéristique précitée, on évite que, lorsque la pièce conductrice est éloignée de la tête de la borne, elle n'emporte avec elle l'insert. D'autre part, cela améliore considérablement l'étanchéité de la vis.This gives several advantages. On the one hand, it ensures a very good connection between the insert and the main part of the screw. Indeed, in the case of the application to a starter electrical terminal, during the passage of current between the conductive part and the terminal head, there may occur microsoudures tending to associate these two parts together. With the above feature, it is avoided that when the conductive part is removed from the head of the terminal, it carries with it the insert. On the other hand, it significantly improves the tightness of the screw.

Le fait que la réservation possède une face de fond présentant une forme convexe permet de favoriser le fluage du cuivre ou de l'alliage cuivreux constituant l'insert. En effet, la solidarisation de l'insert à la partie principale se fait généralement par une frappe à froid. Dans ces conditions, le cuivre - ou l'alliage cuivreux - ne présente pas une très grande capacité de déformation, et il est donc très avantageux, pour obtenir un remplissage complet de la réservation, d'avoir recours à une géométrie particulière favorisant le fluage du matériau constitutif de l'insert.The fact that 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. Indeed, the attachment of the insert to the main part is usually by a cold stamping. Under these conditions, 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.

Par « face de fond de forme convexe », on entend que la réservation présente, en coupe, un contour convexe, c'est-à-dire que le fond de la réservation est en creux et non en saillie. Grâce à cette géométrie, et au cours de l'assemblage de l'insert et de la partie principale, l'insert se déforme tout d'abord vers le fond de la réservation puis, une fois en contact contre ce fond, l'insert se déforme radialement jusqu'à la paroi latérale en contre dépouille pour venir combler toute la réservation. On obtient ainsi un mariage parfait entre l'insert et la réservation, ce qui permet, en plus d'une excellente tenue mécanique, d'empêcher la formation d'arcs électriques.By "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.

La face de fond de la réservation peut présenter une forme tronconique convexe.The bottom face of the reservation may have a convex frustoconical shape.

Selon une réalisation possible, la partie principale comprend une gorge sensiblement annulaire ménagée dans la face transversale, autour de la réservation et coaxialement à celle-ci. La gorge peut présenter en section une forme en pointe depuis la face transversale en direction du fond de la gorge.According to one possible embodiment, 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.

Avantageusement, l'insert peut comporter une pastille réalisée d'une pièce avec le tenon, la pastille étant sensiblement en forme de disque, de même axe que le tenon et de plus grand diamètre que celui-ci, l'insert étant solidarisé à la partie principale de sorte que la pastille épouse la face transversale. Dans le cas où la face transversale présente une gorge, cette gorge est comblée par la matière constitutive de la pastille. Ceci permet d'améliorer encore la solidarisation entre l'insert et la partie principale de la vis, notamment en apportant une tenue radiale.Advantageously, 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. In the case where the transverse face has a groove, this groove is filled by the constituent material of the pellet. This makes it possible to further improve the connection between the insert and the main part of the screw, in particular by providing a radial holding.

Par ailleurs, la face transversale libre de l'insert - et notamment de la pastille lorsqu'elle est présente - peut comporter des stries.Moreover, the free transverse face of the insert - and in particular of the pellet when it is present - may comprise streaks.

La face d'extrémité de l'insert destinée à venir en contact avec la face de fond de la réservation est, selon une réalisation avantageuse, sensiblement plane ou en saillie (c'est-à-dire bombée ou en pointe, de préférence avec une forme adaptée à la forme du fond de la réservation, par exemple tronconique convexe). Ceci permet de favoriser le fluage du cuivre ou de l'alliage cuivreux à la fois axialement et radialement.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.

De plus, la lèvre en saillie favorise la retenue de l'insert dans la réservation.In addition, the projecting lip promotes the retention of the insert in the reservation.

Selon un deuxième aspect, l'invention concerne un procédé de réalisation d'une vis comportant un corps et une tête, le procédé étant conforme à la revendication 8.

According to a second aspect, the invention relates to a method for producing a screw comprising a body and a head, the method being in accordance with claim 8.

La partie principale de la vis est par exemple façonnée à partir du lopin par formage à froid, notamment lorsque cette partie principale est réalisée en acier.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.

Il est à noter que la réservation pourrait également présenter initialement une forme non parfaitement cylindrique mais légèrement conique (légère dépouille).It should be noted that the reservation could also initially have a shape that is not perfectly cylindrical but slightly conical (slight clearance).

Selon un mode de réalisation, l'étape b3) peut être réalisée en formant dans ladite face transversale une gorge sensiblement annulaire et de même axe que la réservation, autour de celle-ci, de façon à déformer localement la partie principale de la vis entre la gorge et la réservation et à donner ainsi une forme en contre dépouille à la face latérale de la réservation.According to one embodiment, 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.

La forme en contre dépouille est donc obtenue par un déplacement localisé de matière.The form against undercut is thus obtained by a localized movement of material.

L'introduction du gabarit dans la réservation et la réalisation de la gorge peuvent être effectués au moyen d'un même outil possédant une face transversale de laquelle font saillie d'une part ledit gabarit cylindrique et d'autre part une nervure annulaire de même axe que le gabarit, agencée autour de celui-ci.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.

La gorge peut présenter en section une forme en pointe depuis la face transversale en direction du fond de la gorge.The groove may have in section a pointed form from the transverse face towards the bottom of the groove.

On décrit à présent, à titre d'exemple non limitatif, plusieurs modes de réalisation possibles de l'invention, en référence aux figures annexées :

  • La figure 1 est une vue en élévation d'un lopin utilisé pour la réalisation d'une vis selon l'invention ;
  • Les figures 2 à 4 sont des représentations schématiques partielles en coupe longitudinale des étapes successives de réalisation d'une vis selon un premier mode de réalisation d'une vis qui n'est pas un mode de réalisation de l'invention;
  • Les figures 5 à 8 sont des représentations schématiques en coupe longitudinale des étapes successives de déformation de l'insert placé dans la réservation de la partie principale de la vis ;
  • Les figures 9 à 10 illustrent deux étapes de réalisation d'une vis selon un deuxième mode de réalisation, correspondant aux étapes représentées sur les figures 2 et 3, ce deuxième mode de réalisation étant un mode de réalisation de l'invention; et
  • La figure 11 est une représentation schématique en coupe longitudinale de la vis obtenue par le deuxième mode de réalisation.
We will now describe, by way of nonlimiting example, several possible embodiments of the invention, with reference to the appended figures:
  • The figure 1 is an elevational view of a billet used for producing a screw according to the invention;
  • The Figures 2 to 4 are partial schematic representations in longitudinal section of the successive steps of producing a screw according to a first embodiment of a screw which is not an embodiment of the invention;
  • The Figures 5 to 8 are diagrammatic representations in longitudinal section of the successive stages of deformation of the insert placed in the reservation of the main part of the screw;
  • The Figures 9 to 10 illustrate two steps of producing a screw according to a second embodiment, corresponding to the steps represented on the Figures 2 and 3 this second embodiment being an embodiment of the invention; and
  • The figure 11 is a schematic representation in longitudinal section of the screw obtained by the second embodiment.

Comme illustré sur la figure 8, une vis 1 selon l'invention est constituée d'une partie principale 2 réalisée ici en acier, et d'un insert 3 en cuivre ou alliage cuivreux, solidarisé à la partie principale 2. La vis comporte ainsi un corps 4 globalement cylindrique et fileté, ainsi qu'une tête 5.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.

On se rapporte aux figures 1 à 4 qui illustrent les étapes du procédé de réalisation de la vis 1, conformément à un premier mode de réalisation d'une vis qui n'est pas un mode de réalisation de l'invention.We refer to Figures 1 to 4 which illustrate the steps of the method of producing the screw 1, according to a first embodiment of a screw which is not an embodiment of the invention.

Tout d'abord, on réalise la partie principale 2, en partant d'un lopin 6 en acier, représenté sur la figure 1. Le lopin 6 comprend une portion globalement cylindrique 7, qui est déjà ou qui sera ultérieurement filetée pour former le corps 4 de la vis 1, et une portion renflée 8 qui formera en partie la tête 5 de la vis 1.Firstly, 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.

Par formage à froid du lopin 6, on façonne la portion renflée 8 pour lui donner une forme extérieure correspondant à celle souhaitée pour la tête 5, et pour réaliser une réservation 9. On obtient ainsi la pièce intermédiaire 10 illustrée sur la figure 2, qui correspond à une ébauche de la partie principale 2.By cold forming of the billet 6, 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. This gives the intermediate part 10 illustrated on FIG. figure 2 , which corresponds to a sketch of the main part 2.

La pièce intermédiaire 10 présente un axe de révolution 11 et une face transversale 12 d'extrémité, sensiblement orthogonale à l'axe, et située à l'opposé de la portion globalement cylindrique 7. La réservation 9 est sensiblement cylindrique et d'axe 11, à l'exception de sa face de fond 13 qui présente une forme convexe, par exemple une forme tronconique convexe correspondant à la forme de l'outil utilisé pour créer cette réservation 9. La réservation 9 présente une ouverture 14 sensiblement circulaire ménagée dans la face transversale 12.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.

La figure 3 illustre l'étape de façonnage de la pièce intermédiaire 10 conduisant à la formation de la partie principale 2. On utilise un outil 15 qui comporte une face transversale 16 de laquelle font saillie, en direction de la pièce intermédiaire 10, d'une part une pièce formant un gabarit cylindrique 17 et d'autre part une nervure 18 annulaire de même axe que le gabarit 17, agencée autour de celui-ci. La nervure 18 peut présenter une section effilée depuis sa base en direction de son extrémité libre. Le gabarit 17 présente une hauteur plus importante que celle de la nervure 18, et un diamètre prédéfini, légèrement inférieur à celui de la réservation 9 sensiblement cylindrique qui vient d'être formée.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.

L'outil 16 est placé du côté de la face transversale 12 de la pièce intermédiaire 10, de sorte que l'axe du gabarit 17 soit sensiblement confondu avec l'axe 11, et est déplacé selon l'axe 11, en direction de la pièce intermédiaire 10. Dans un premier temps, le gabarit 17 pénètre dans la réservation 9 alors que la nervure 18 est encore à distance de la face transversale 12. Puis la nervure 18 vient en contact avec la face transversale 12 et, par formage à froid, vient y créer une gorge 19 de section correspondante.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. At first, the template 17 enters the reservation 9 while the rib 18 is still spaced from the transverse face 12. Then the rib 18 comes into contact with the transverse face 12 and, by cold forming , comes to create a throat 19 of corresponding section.

Lors de la formation de la gorge 19, il se produit un déplacement localisé de matière (ici l'acier) entre cette gorge 19 et la réservation 9. Ainsi, comme illustré sur la figure 3, la face latérale 20 de la réservation 9 se déforme pour converger vers l'axe 11 depuis la face de fond 13 en direction de l'ouverture 14. Cette étape du procédé conduit donc à la formation d'une réservation 9 dont la face latérale 20 présente une forme en contre dépouille. Le déplacement localisé de la matière constitutive de la partie principale 2 est limité et contrôlé par le gabarit 17 introduit dans la réservation 9, qui permet de garantir un diamètre calibré de l'ouverture 14 lorsque cette étape du procédé est achevée.During the formation of the groove 19, there is a localized movement of material (here steel) between this groove 19 and the reservation 9. Thus, as illustrated in FIG. figure 3 , the lateral face 20 of the reservation 9 is deformed to converge towards the axis 11 from the bottom face 13 towards the opening 14. This process step therefore leads to the formation of a reservation 9 whose side face 20 has an undercut shape. The localized displacement of the constituent material of the main part 2 is limited and controlled by the template 17 introduced in the reservation 9, which makes it possible to guarantee a calibrated diameter of the opening 14 when this process step is completed.

A titre d'exemple, le diamètre de l'ouverture 14 (c'est-à-dire le diamètre de la réservation 9 au niveau de la face transversale 12) est de l'ordre de 5 à 8 mm, notamment 6,2 mm, et l'angle d'inclinaison de la face latérale 20 de la réservation par rapport à l'axe 11 est de l'ordre de 15 à 20°, par exemple voisin de 16°. En outre, la profondeur de la réservation est supérieure à 2 mm, par exemple voisine de 3 mm. Cette valeur relativement importante favorise le bon ancrage de l'insert 3 dans la réservation 9.For example, 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 °. In addition, 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.

La réservation 9 est destinée à recevoir l'insert 3, dont la forme d'origine (avant déformation) est illustrée sur la figure 4. L'insert 3 comprend une pastille 21 sensiblement en forme de disque, de laquelle fait saillie un tenon 22 globalement cylindrique de même axe que la pastille 21 et possédant un diamètre correspondant sensiblement à celui de la réservation 9. Par exemple, le diamètre du tenon 22 peut être voisin du diamètre de l'ouverture 14 de la réservation 9 en contre dépouille.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. For example, the diameter of the stud 22 may be close to the diameter of the opening 14 of the reservation 9 against undercut.

En outre, la face d'extrémité 27 du tenon 22 opposée à la pastille 21, et destinée à venir en contact avec la face de fond 13 de la réservation 9, est sensiblement plane.In addition, the 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.

Le tenon 22 de l'insert 3 est placé dans la réservation 9, et vient en appui contre le fond de celle-ci, tandis que la pastille 21 peut reposer sur la face transversale 12 ou être située à distance de cette face (comme illustré sur la figure 4). Puis l'insert 3 est déformé par pression, à froid, au moyen d'un outil approprié 23 (voir figure 4), pour être serti dans la réservation 9. Les phases successives de la déformation de l'insert 3 par l'outil 23, jusqu'à l'obtention de la vis 1, sont représentées sur les figures 5 à 8. La distance entre la face transversale 24 de poussée de l'outil 23 et la face transversale 12 de la partie principale 2 diminue de 0,5 mm entre deux figures successives.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.

Au cours de cette étape de sertissage, l'insert 3 est progressivement déformé de la façon suivante. Tout d'abord, le tenon 22, comprimé contre la face de fond 13 de la réservation, voit son diamètre augmenter et sa forme générale passer du cylindre à une forme venant épouser la face latérale 20 et la face de fond 13 de la réservation 9, pour combler tout l'espace de cette réservation 9, y compris la zone en contre dépouille. Puis, lorsque la réservation 9 est remplie par l'insert, la pastille 21 voit son épaisseur diminuer et son diamètre augmenter, jusqu'à ce qu'elle recouvre sensiblement totalement la face transversale 12 de la partie principale 2. De plus, la pastille 21 se déforme également pour venir combler et s'incruster dans la gorge 19.During this crimping step, 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.

A l'issue du sertissage, comme illustré sur la figure 8, l'insert 3 est parfaitement solidarisé à la partie principale 2, le tenon 22 remplissant la réservation 9 et la pastille 21 épousant la face transversale 12, y compris la gorge 19. La tête 5 de la vis 1 est ainsi formée par l'insert 3 et une partie de la partie principale 2.After crimping, as illustrated on the figure 8 , 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.

Le fait que l'insert 3 ne soit pas constitué d'une unique pièce cylindrique mais d'un tenon 22 et d'une pastille est avantageux. En effet, cela permet que ces deux parties de l'insert 3 puissent subir des déformations différentes et remplir parfaitement leur fonction propre, à savoir : le remplissage total de la réservation pour le tenon 22 et l'écrasement et l'accrochage à la paroi transversale 12 pour la pastille 21.The fact that 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.

La face transversale libre 25 de la pastille 21 peut en outre comporter des stries 26, formées par action de l'outil 23 ou d'une autre façon. Dans le cas où la vis 1 constitue une borne électrique de démarreur, notamment, les stries 26 visent à éviter un contact sur une trop grande surface plane avec la pièce conductrice permettant la mise en route du démarreur. Les risques de solidarisation entre ces deux pièces, et donc d'extraction de l'insert 3 hors de la réservation 9 lorsque la pièce conductrice est éloignée de la vis 1.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. In the case where the screw 1 constitutes an electric starter terminal, in particular, 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.

Un deuxième mode de réalisation est illustré sur les figures 9 à 11. Ce deuxième mode de réalisation est un mode de réalisation de l'invention.A second embodiment is illustrated on the Figures 9 to 11 . This second embodiment is an embodiment of the invention.

A partir du lopin 6 de la figure 1, on réalise par formage à froid la pièce intermédiaire 10 illustrée sur la figure 9.From plot 6 of the figure 1 , the intermediate piece 10 illustrated on the drawing is produced by cold forming. figure 9 .

Par rapport à la pièce intermédiaire 10 représentée sur la figure 2, la pièce intermédiaire 10 selon ce deuxième mode de réalisation comprend une lèvre 28 annulaire faisant saillie globalement axialement depuis la face transversale 12, sensiblement à la périphérie de l'ouverture 14 de la réservation 9. La hauteur h de cette lèvre 28 est par exemple de l'ordre de 0,5 à 0,6 mm.With respect to the intermediate part 10 represented on the figure 2 , the intermediate piece 10 according to this second embodiment 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.

Puis, comme illustré sur la figure 10, on façonne la pièce intermédiaire 10 afin d'obtenir la partie principale 2. On utilise un outil 15 qui comporte une face transversale 16 sensiblement plane de laquelle fait saillie, en direction de la pièce intermédiaire 10, un gabarit cylindrique 17 de diamètre prédéfini, légèrement inférieur à celui de la réservation 9 sensiblement cylindrique qui vient d'être formée. Par la pression exercée contre la face transversale 12 (frappe à froid), la lèvre 28 est déformée et rabattue vers l'axe 11 de la partie principale 2.Then, as illustrated on the figure 10 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. By the pressure exerted against the transverse face 12 (cold striking), the lip 28 is deformed and folded towards the axis 11 of the main part 2.

On obtient ainsi, par déplacement localisé de matière, d'une part la formation de la face latérale 20 en contre dépouille et d'autre part une lèvre 28 dirigée vers l'intérieur, et qui formera un moyen de retenue supplémentaire pour l'insert 3 (voir figure 11). Il est à noter que ce moyen de retenue peut être continu sur toute la périphérie ou localisé.Thus, by localized displacement of material, on the one hand the formation of the side face 20 against undercut and on the other hand an inwardly directed lip 28, which will form an additional retaining means for the insert 3 (see figure 11 ). It should be noted that this retaining means can be continuous over the entire periphery or located.

L'invention permet de garantir sur une durée de vie importante les propriétés électriques et mécaniques requises pour une telle vis.The invention makes it possible to guarantee over a long service life the electrical and mechanical properties required for such a screw.

Il va de soi que l'invention n'est pas limitée aux modes de réalisation décrits ci-dessus à titre d'exemples mais qu'elle en embrasse au contraire toutes les variantes de réalisation.It goes without saying that the invention is not limited to the embodiments described above as examples but that it encompasses all variants.

Claims (12)

  1. A screw having a globally cylindrical body (4) and a head (5), said screw comprising:
    - a main portion (2) made from a material other than copper or a copper alloy, forming the body (4) and part of the head (5) of the screw (1), said part of the head (5) of the screw (1) comprising a transverse surface (12) situated opposite the body (4) and a cavity (9) having a shape of revolution with the same axis (11) as the body (4) and having an opening (14) formed in said transverse surface (12) and an undercut side surface (20);
    - an insert (3) made from copper or a copper alloy having a globally cylindrical post (22) with a diameter substantially corresponding to that of the cavity (9), the insert (3) being secured to the main portion (2) such that the post (22) fills in the entire cavity (9) and the insert (3) protrudes axially beyond the transverse surface (12);
    characterized in that the cavity (9) has a bottom surface (13) having a convex shape and in that the main portion (2) has a lip (28) protruding from the side surface (20) undercutting the cavity (9), toward the axis (11), said lip (28) being situated at the opening (14) of the cavity (9).
  2. The screw according to claim 1, characterized in that the bottom surface (13) of the cavity (9) has a convex tapered shape.
  3. The screw according to claim 1 or 2, characterized in that the main portion (2) comprises a substantially annular groove (19) formed in the transverse surface (12), around the cavity (9) and coaxially thereto.
  4. The screw according to one of claims 1 to 3, characterized in that the insert (3) has a pellet (21) made in one piece with the post (2), the pellet (21) being substantially disc-shaped, with the same axis as the post (22) and a larger diameter than the latter part, the insert (3) being secured to the primary portion (2) such that the pellet (21) matches the transverse surface (12).
  5. The screw according to one of claims 1 to 4, characterized in that the free transverse surface (25) of the insert (3) has streaks (26).
  6. The screw according to one of claims 1 to 5, characterized in that the end surface (27) of the insert (3) designed to come into contact with the bottom surface (13) of the cavity (9) is substantially planar or protruding.
  7. The screw according to one of claims 1 to 6, characterized in that the component material of the main portion (2) is a steel.
  8. A method for making a screw (1) having a body (4) and a head (5), comprising the following steps:
    a) providing a slug (6) made from a material other than copper, which has a first globally cylindrical portion (7) designed to form the body (4) of the screw (1) and an expanded portion (8) designed to form a portion of the head (5) of the screw (1);
    b) forming the slug (6) to produce a main portion (2) of the screw (1), while giving the expanded portion (8) substantially the outer shape of the head (5) with a transverse surface (12) situated opposite the globally cylindrical portion (7), and forming, in said expanded portion (8), a cavity (9) having a shape of revolution of the same axis (11) as the globally cylindrical portion (7), and having an opening (14) formed in said transverse surface (12) and an undercut side surface (20);
    c) providing a copper or copper alloy insert (3) having a substantially cylindrical post (22) with a diameter substantially corresponding to that of the cavity (9) formed in the main portion (2) of the screw (1);
    d) placing the post of the insert (3) in the cavity (9) and deforming the insert (3) by pressure so that the post (22) fills in the entire cavity (9), while protruding axially beyond the transverse surface (12), so as to secure the insert (3) and the main portion (2) of the screw (1);
    characterized in that step b) comprises the following successive steps:
    b1) forming, in the expanded portion (8), a substantially cylindrical cavity (9), having the same axis (11) as the globally cylindrical portion (7) and having an opening (14) formed in said transverse surface (12), step b1) comprising the formation, in the expanded portion (8), of an annular lip (28) protruding globally axially from the transverse surface (12) substantially at the periphery of the opening (14) of the cavity (9);
    b2) inserting a cylindrical template (17) with a predefined diameter in the still substantially cylindrical cavity (9) so as to obtain an opening (14) of said cavity (9) with a calibrated diameter;
    b3) then machining the main portion (2) of the screw (1) so as to impart an undercut shape to the side surface (20) of the cavity (9), by exerting pressure on the transverse surface (12) so as to deform said lip and fold it down toward the axis (11) of the main portion (2).
  9. The method according to claim 8, characterized in that the main portion (2) of the screw (1) is machined from the slug (6) by cold working.
  10. The method according to claim 8 or 9, characterized in that step b3) is carried out by forming, in said transverse surface (12), a substantially annular groove (19) with the same axis (11) as the cavity (9), around the latter part, so as to deform the main portion (2) of the screw (1) locally between the groove (19) and the cavity (9) and thereby impart an undercut shape to the side surface (20) of the cavity (9).
  11. The method according to claim 10, characterized in that the insertion of the template (17) into the cavity (9) and the production of the groove (19) are done using a same tool (15) having a transverse surface (16) from which on the one hand said cylindrical template (17), and on the other hand an annular rib (18) with the same axis as the template (17), arranged around it, protrude.
  12. The method according to one of claims 10 or 11, characterized in that the groove (19) has a tip-shaped section from the transverse surface (12) toward the bottom of the groove (19).
EP08356071A 2007-05-24 2008-05-21 Screw, in particular a starter electric terminal and manufacturing method Not-in-force EP1995745B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08356071T PL1995745T3 (en) 2007-05-24 2008-05-21 Screw, in particular a starter electric terminal and manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0703681A FR2916582B1 (en) 2007-05-24 2007-05-24 SCREW, IN PARTICULAR ELECTRIC STARTER TERMINAL, AND METHOD OF MAKING SAME

Publications (2)

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

Family

ID=38481374

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08356071A Not-in-force EP1995745B1 (en) 2007-05-24 2008-05-21 Screw, in particular a starter electric terminal and manufacturing method

Country Status (4)

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

Cited By (1)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013200607A1 (en) * 2013-01-16 2014-07-17 Inovan Gmbh & Co. Kg Contact element, relay comprising a contact element and method for producing a contact element
MC200158B1 (en) 2013-06-11 2014-07-09 Dinegro Stefano Screw for electrical contacts
CN104347316B (en) * 2013-07-26 2018-10-26 索恩格汽车部件德国有限公司 Electromagnetic switch and starter
PL225180B1 (en) 2014-03-24 2017-02-28 Gaweł Zakład Produkcji Śrub Spółka Akcyjna Bolt and method for producing it
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)

* Cited by examiner, † Cited by third party
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 (en) * 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 (en) * 1981-03-04 1984-10-16 株式会社日立製作所 Method of manufacturing electrical contacts
DE9110356U1 (en) * 1991-08-22 1992-12-24 Robert Bosch Gmbh, 70469 Stuttgart Contact bolts for switching high currents

Cited By (1)

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

Also Published As

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

Similar Documents

Publication Publication Date Title
EP1995745B1 (en) Screw, in particular a starter electric terminal and manufacturing method
EP2265828B1 (en) Method for assembling composite hardware, and riveting member enabling implementation thereof
WO2009044029A2 (en) Terminal for electrical connection and method for assembly thereof
EP2552622B1 (en) Rivet and riveting tool
CA2619224A1 (en) Insert designed to mounted in an element, for fixing and electrically contacting an electrically connecting socket
EP1469560A1 (en) Contact piece for an electrical connector
WO2006123076A2 (en) Sealing by material deformation
FR2865264A1 (en) PREHEATING CANDLE AND METHOD OF MANUFACTURING SUCH CANDLE
FR3088771A1 (en) PYROTECHNIC DEVICE WITH RIVETE BOX
EP2362496B1 (en) Connection element production method for bayonet connector and connection device
FR2657658A1 (en) PROCESS FOR ASSEMBLING MATERIALS AND RIVETING MEMBER FOR IMPLEMENTING SAME.
FR2515885A1 (en) PROCESS FOR PRODUCING A COMPOSITE ELECTRODE FOR IGNITION CANDLE AND THAT ELECTRODE
EP1598567B1 (en) Method for assembling a press rivet and press rivet obtained by such a method
FR2758661A1 (en) High current connector for cable on bolted terminal post for vehicles
FR2878658A1 (en) NEW METHOD FOR MOUNTING A CANDLE AND SPOOL ASSEMBLY USING A TORQUE TRANSMISSION BY THE SPOOL BODY
EP3455023B1 (en) Method of joining very thick tubular parts by magnetic pulses
FR2936373A1 (en) Monoblock connector fabricating method for electrical cable, involves locally compressing cylinder for forming flat end part of connector, while consequently forming intermediate transition part between tubular part and end part
EP1650831B1 (en) Cable lug for an electrical connection comprising a reduced section
EP1383201A1 (en) Improvement method for a binding a contact to stands of a cable
FR2699617A1 (en) Stud insert with threaded element
FR2758910A1 (en) Earth terminal for use in vehicle electrical wiring system
WO2010079295A2 (en) Power storage device, particularly for fitting on an automobile
FR2998949A1 (en) DIESEL ENGINE PREHEATING CANDLE
FR2949538A1 (en) PREHEATING CANDLE AND METHOD OF MANUFACTURING SUCH CANDLE
FR3118279A1 (en) ELECTROMAGNETIC POWER CONTACTOR FOR A STARTER

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA MK RS

17P Request for examination filed

Effective date: 20090525

17Q First examination report despatched

Effective date: 20090625

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 589766

Country of ref document: AT

Kind code of ref document: T

Effective date: 20130115

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602008020932

Country of ref document: DE

Effective date: 20130214

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2401639

Country of ref document: ES

Kind code of ref document: T3

Effective date: 20130423

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130319

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20121219

Ref country code: AT

Ref legal event code: MK05

Ref document number: 589766

Country of ref document: AT

Kind code of ref document: T

Effective date: 20121219

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130320

REG Reference to a national code

Ref country code: SK

Ref legal event code: T3

Ref document number: E 13696

Country of ref document: SK

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130419

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130319

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130419

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

REG Reference to a national code

Ref country code: PL

Ref legal event code: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

26N No opposition filed

Effective date: 20130920

BERE Be: lapsed

Owner name: VIS SAMAR

Effective date: 20130531

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602008020932

Country of ref document: DE

Effective date: 20130920

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130531

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130531

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130531

REG Reference to a national code

Ref country code: RO

Ref legal event code: EPE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130521

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20121219

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20130521

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20080521

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20180625

Year of fee payment: 11

Ref country code: SK

Payment date: 20180420

Year of fee payment: 11

Ref country code: DE

Payment date: 20180416

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: TR

Payment date: 20180514

Year of fee payment: 11

Ref country code: FR

Payment date: 20180412

Year of fee payment: 11

Ref country code: PL

Payment date: 20180419

Year of fee payment: 11

Ref country code: IT

Payment date: 20180514

Year of fee payment: 11

Ref country code: RO

Payment date: 20180502

Year of fee payment: 11

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20180412

Year of fee payment: 11

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602008020932

Country of ref document: DE

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20190521

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: RO

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190521

Ref country code: SK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190521

REG Reference to a national code

Ref country code: SK

Ref legal event code: MM4A

Ref document number: E 13696

Country of ref document: SK

Effective date: 20190521

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190521

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190521

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20191203

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190531

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20201001

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190522

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190521

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20190521