EP1376764B1 - Vis à amorces de rupture multiples - Google Patents

Vis à amorces de rupture multiples Download PDF

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Publication number
EP1376764B1
EP1376764B1 EP20030014617 EP03014617A EP1376764B1 EP 1376764 B1 EP1376764 B1 EP 1376764B1 EP 20030014617 EP20030014617 EP 20030014617 EP 03014617 A EP03014617 A EP 03014617A EP 1376764 B1 EP1376764 B1 EP 1376764B1
Authority
EP
European Patent Office
Prior art keywords
screw
shank
screw according
disks
indentations
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP20030014617
Other languages
German (de)
English (en)
Other versions
EP1376764A2 (fr
EP1376764A3 (fr
Inventor
Christian Dipl.-Ing. Niklis (FH)
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.)
Arcus Elektrotechnik Alois Schiffmann GmbH
Original Assignee
Arcus Elektrotechnik Alois Schiffmann GmbH
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
Priority claimed from DE10234460A external-priority patent/DE10234460B3/de
Application filed by Arcus Elektrotechnik Alois Schiffmann GmbH filed Critical Arcus Elektrotechnik Alois Schiffmann GmbH
Publication of EP1376764A2 publication Critical patent/EP1376764A2/fr
Publication of EP1376764A3 publication Critical patent/EP1376764A3/fr
Application granted granted Critical
Publication of EP1376764B1 publication Critical patent/EP1376764B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/30—Clamped connections, spring connections utilising a screw or nut clamping member
    • H01R4/307—Clamped connections, spring connections utilising a screw or nut clamping member characterised by the thread of the screw or nut

Definitions

  • the invention relates to a multi-shear screw, having a cylindrical body which has a thread on its outer side, and having a head at one end of the body, the engagement surfaces for a drive tool, wherein the screw has a plurality of axially separate predetermined breaking points, the one Forming a series of shear planes.
  • shear screws are for example from the EP-A-0 692 643 known and used for example in screw connectors to connect electrical cable conductors. In this context, it is important to contact the conductor ends with a predetermined contact pressure in order to ensure a perfect mechanical and electrical connection.
  • shear screws are well suited because they can be set to predetermined shearing torques. The tearing of the head then ensures that the screw has been tightened with the specified torque and thus generates the desired contact pressure. At the same time it is reliably avoided that such a screw is tightened too much and possibly crushed or damaged the conductor end of a cable ladder.
  • the conventional shear screw according to the EP-A-0 692 643 is formed so that the shaft has a series of threaded portions which are separated by incisions, which form predetermined breaking points to specify appropriate levels of scissors.
  • the invention is therefore based on the object to provide a shear bolt of the type mentioned, which has a robust construction and ensures reliable operation in practice.
  • the solution according to the invention is to design a multiple shear screw of the type mentioned above in such a way that the body has a central pin with a non-circular cross-section, in which axially spaced-apart radial recesses are incorporated, and also one or more discs which are attached to the pin, and that the body has a continuous thread on its outside.
  • the problem is solved in a satisfactory manner.
  • the punctures for producing the predetermined breaking points can be incorporated completely independently of the thread on the outside of the body. There are no additional “edges” on any threaded sections that can be damaged during handling. With a continuous, one-piece thread also ensures that the screw works reliably even under high mechanical loads.
  • the number of axially spaced radial punctures and the corresponding plugged discs may be selected depending on the circumstances of the practice to specify any number of shear planes at the predetermined breaking points, which are formed by the punctures.
  • the punctures are formed as circumferential annular grooves. In this way, a uniform shearing of the screw is favored when it is tightened in operation and a predetermined torque is exceeded.
  • the recesses taper in a wedge shape in the longitudinal section of the screw in the radial direction.
  • the respective shear plane can thus be exactly predetermined, at which the screw should tear during operation.
  • the recesses penetrate in different depths in the radial direction in the material of the pin. In this way, it is achieved that the screw on the respective punctures only breaks off when the torque specified there is exceeded at the respective location. In particular, it is possible to specify at which point the screw tears most easily, and which predetermined breaking point tears off last.
  • the recesses in the screw according to the invention have a flat bottom which extends substantially perpendicular to the central axis of the screw. In this way it is achieved that the screw forms a smoother fracture surface when the screw tears off when a predetermined torque at the shear plane is exceeded.
  • the punctures are formed such that the screw tears off at the shear planes formed by them at torques which gradually increase from the front end of the screw towards its head. If such a screw is used in operation and tightened against a workpiece, such as a conductor in a screw, so it is ensured that the screw always breaks off at the appropriate location.
  • the tearing torques gradually decrease from the front end of the screw towards its head. This depends on the respective circumstances.
  • the discs have an axial height which is equal to the axial distance between each two adjacent radial recesses. This ensures that the screw forms a particularly smooth fracture plane after tearing.
  • the discs have a smooth upper side, which may be flat or convex on one side or concave on one side. If the upper side is concave on one side, then it can be achieved that the predetermined breaking point in the region of the pin is slightly sunk relative to the outer edge of the disk.
  • the screw has at its front end an annular plate which forms a support for the attached discs.
  • the plate forms on the one hand a stop for the respective discs and on the other hand forms the front contact region of the screw.
  • the plate has the same diameter as the discs. Then, the plate and the attached discs form a homogeneous unit, namely a cylindrical body having on its outer side the continuous thread.
  • the plate is formed with a crowned screw tip or another contact geometry.
  • Such screws are well suited for electrical screw.
  • the screw tip may for example have the shape of a spherical cap, a tapered cone or a flat face of a contact screw.
  • the discs have a recess complementary to the pin and with a press fit are attached directly to each other on the pin. This achieves a compact design of the screw.
  • any contour with a non-circular cross-section can be used for the journal and the complementary internal recess of the discs.
  • the pin has an outer edge at its upper end.
  • it may be an external hexagon, so that conventional tools can be used.
  • the pin has at its upper end an axially machined, central inner edge, in particular a hexagon socket, so that conventional tools can be used to actuate the screw.
  • an inner edge may be provided in addition to or as an alternative to the outer edge in order to allow the fitter the choice of the tool.
  • the discs are fitted with positive engagement on the pin and fixed on it before incorporating the thread. This results in a particularly compact and homogeneous arrangement of the screw.
  • a pin 12 as a body for a multiple shear screw according to the invention.
  • the pin 12 has expediently a symmetrical structure with respect to the central axis 38.
  • a circular plate 16 which has on its outer side a spherical screw cap 18, for example as Ball dome can be formed and can form the attack surface of a contact screw.
  • a head 20 at the top of the pin 12 and the plate 16 can be seen a plurality of radial recesses 22, which expediently have a flat bottom 24 to specify predetermined breaking points in desired shear planes.
  • Fig. 3 shows a schematic representation of the entire screw 10 obliquely from above, with circular discs 26 are attached to the pin 12.
  • Fig. 4 and 5 such discs 26 are shown schematically. It can be seen that these discs 26 each have an inner recess 28 which has a non-circular cross section and is adapted to the non-circular cross-section of the pin 12.
  • the height of the discs 26 is suitably sized so that it corresponds to the distance between each two axially spaced punctures 22. Conveniently, these dimensions, ie the axial distances of the punctures and thus the height of the discs uniformly predetermined so that such discs 26 can be plugged in any order on the pin 12.
  • the pin 12 has the shape of a uniform external hexagon, which receives the discs 26 with a corresponding complementary hexagonal inner recess 28, wherein these are fitted with a press fit on the pin 12.
  • the pin 12 or the discs 26, each formed complementary to each other to ensure a compact design of the screw 10.
  • the top of the uppermost disc 26 is assigned according to the last recess 22 in front of the head 20 of the shear screw 10, as the Fig. 3 and 6 can take.
  • the pin 12 forms with the attached discs 26 a cylindrical body 32, on the outside of a continuous thread 34 is incorporated.
  • the head 20 is formed in this embodiment as an outer edge 36, in particular as an external hexagon, wherein its outer contour have the same shape as the underlying pin portions 30. Then the head 20 no longer needs to be processed separately.
  • the head 20 but also have a smaller cross-section. Furthermore, it is possible to incorporate into the upper end of the pin 12 a central inner edge axially symmetrical, in particular a hexagon socket, if desired.
  • punctures 22 may be provided in regions, but are expediently designed as circumferential annular grooves and taper in the longitudinal section of the screw in the radial direction wedge-shaped inward to specify the exact location of the predetermined breaking points.
  • the recesses 22 are incorporated in the radial direction at different depths into the material of the pin 12.
  • the punctures 22 have expediently a flat bottom 24, substantially perpendicular to the central axis 38 of the screw 10, to provide a smooth fracture surface.
  • the punctures 22 are suitably designed in their dimensions so that the shearing torques from the plate 16 to the head 20 of the pin 12 gradually increase.
  • the lowest breaking point optionally ruptures first or the head 20 adjacent to the predetermined breaking point last, when the screw 10 is tightened against a workpiece and torque is exceeded.
  • the arrangement may also be such that the breakaway torques gradually decrease from the screw tip 18 at the front end of the screw 10 towards its head 20. It will then be provided corresponding attack surfaces in the form of an inner edge in the screw 10 to tear off the corresponding screw components gradually.
  • the discs 26 in the illustrated embodiment have a smooth, planar top. However, this can also be convex on one side or concave on one side. In the latter case it is achieved that the fracture surface is slightly sunk on the pin 12 with respect to the outer edge of the disc 26 with the thread 34.
  • the top of the respective disc 26 is chamfered on the outer edge. In this way, after tearing off such a shear screw on the top no unnecessarily sharp edges are present, which could damage a sleeve, which is for example subsequently attached to a screw around.
  • the predetermined breaking points which are formed by the recesses 22, protected inside the finished screw 10 housed.
  • the screw 10 itself has a continuous external thread 34, as in Fig. 6 is indicated.
  • a pin which has a non-circular cross-section, for example, as an axially symmetrical external hexagon, which has at its lower end a radially projecting stop, which is to serve as a support for the discs 26. Subsequently, 12 corresponding radial recesses 22 are incorporated in the pin, with a predetermined number and penetration depth in desired axial distances.
  • discs 26 are fitted with complementary inner recess 28 for external configuration of the pin 12 on the pin 12, so that the cylindrical body 32 according to Fig. 3 results.
  • the aforementioned stop at the lower end of the pin 12 is expediently designed as a plate 16 which has the same diameter as the discs 26.
  • a thread is incorporated over the entire cylindrical body 32 on the outside, in particular rolled or cut. This creates the continuous thread 34 according to Fig. 6 while the predetermined breaking points forming recesses 22 are housed protected inside the screw 10.
  • the material for the screw 10 conventional metals or metal alloys can be used, which are selected depending on the purpose. In special cases, however, such a screw may also consist entirely or partially of plastic or some other insulating material, for example ceramic.

Landscapes

  • Milling Processes (AREA)
  • Disintegrating Or Milling (AREA)
  • Bolts, Nuts, And Washers (AREA)

Claims (19)

  1. Vis multi-sécable, comprenant un corps cylindrique (32), qui possède un filet (34) sur son côté externe, et une tête (20) à l'une des extrémités du corps (32), qui présente des surfaces de prise (36) pour un outil d'entraînement, dans laquelle la vis présente plusieurs points de rupture (22) séparés axialement, qui forment une série de plans de cisaillement,
    caractérisée en ce que
    le corps (32) présente une tige centrale (12) ayant une section transversale ovalisée, dans laquelle sont aménagées des encoches radiales (22) distantes axialement, ainsi qu'une ou plusieurs rondelles (26), qui sont enfilées sur la tige (12), et en ce que
    le corps (32) présente un filet ininterrompu (34) sur son côté externe.
  2. Vis selon la revendication 1,
    caractérisée en ce que
    les encoches (22) se présentent sous la forme de rainures annulaires périphériques.
  3. Vis selon la revendication 1 ou 2,
    caractérisée en ce que
    les encoches (22) se réduisent dans la section longitudinale de la vis pour adopter un profil cunéiforme dans la direction radiale.
  4. Vis selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que
    les encoches (22) pénètrent dans le matériau de la tige (12) sur une profondeur différente dans la direction radiale.
  5. Vis selon l'une quelconque des revendications 1 à 4,
    caractérisée en ce que
    les encoches (22) présentent un fond plat (24) qui s'étend de manière sensiblement perpendiculaire à l'axe central (38) de la vis.
  6. Vis selon l'une quelconque des revendications 1 à 5,
    caractérisée en ce que
    les encoches (22) sont aménagées de sorte que la vis se rompe dans les plans de cisaillement qu'elles forment à des niveaux de couple de torsion qui augmentent ou diminuent progressivement de l'extrémité avant (14) de la vis à sa tête (20).
  7. Vis selon l'une quelconque des revendications 1 à 6,
    caractérisée en ce que
    les rondelles (26) ont une hauteur axiale qui est égale à la distance axiale comprise entre respectivement deux encoches radiales distantes (22).
  8. Vis selon l'une quelconque des revendications 1 à 7,
    caractérisée en ce que
    les rondelles (26) ont une face supérieure lisse qui se présente sous une forme plane ou convexe d'un côté ou concave d'un côté.
  9. Vis selon l'une quelconque des revendications 1 à 8,
    caractérisée en ce que
    la face supérieure de la rondelle respective (26) est biseautée sur le bord externe.
  10. Vis selon l'une quelconque des revendications 1 à 9,
    caractérisée en ce que
    la vis présente, à son extrémité avant, un plateau annulaire (16) qui forme un support pour les rondelles enfilées (26).
  11. Vis selon la revendication 10,
    caractérisée en ce que
    le plateau (16) présente le même diamètre que celui des rondelles (26).
  12. Vis selon la revendication 10 ou 11,
    caractérisée en ce que
    le plateau (16) se présente avec un sommet de vis bombé (18).
  13. Vis selon l'une quelconque des revendications 1 à 12,
    caractérisée en ce que
    les rondelles (26) ont un évidement interne (28) complémentaire de la tige (12) et sont enfilées par ajustage serré directement l'une sur l'autre sur la tige (12).
  14. Vis selon l'une quelconque des revendications 1 à 13,
    caractérisée en ce que
    l'extrémité supérieure de la tige (12) forme la tête (20) de la vis pour l'outil d'entraînement.
  15. Vis selon l'une quelconque des revendications 1 à 14,
    caractérisée en ce que
    la tige (12) présente, à son extrémité supérieure, un bord externe (36) comme tête.
  16. Vis selon l'une quelconque des revendications 1 à 15,
    caractérisée en ce que
    la tige (12) présente, à son extrémité supérieure, un bord interne central aménagé axialement.
  17. Procédé de fabrication d'une vis multi-sécable,
    caractérisé par les étapes suivantes consistant à :
    - préparer une tige (12) avec une section transversale ovalisée,
    - aménager des encoches radiales (22) axialement distantes dans la tige (12) à intervalles prédéfinis,
    - enfiler un certain nombre de rondelles (26) sur la tige (12) pour former un corps cylindrique (32), et
    - aménager un filet ininterrompu (34) sur le côté externe du corps cylindrique (32).
  18. Procédé selon la revendication 17,
    caractérisé en ce que
    l'on utilise une tige (12) avec un plateau (16) radialement saillant qui forme un support pour les rondelles (26).
  19. Procédé selon la revendication 17 ou 18,
    caractérisé en ce que
    les rondelles (26) sont enfilées en prise par adaptation de forme sur la tige (12) et y sont fixées avant l'aménagement du filet (34).
EP20030014617 2002-06-27 2003-06-26 Vis à amorces de rupture multiples Expired - Lifetime EP1376764B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE10228815 2002-06-27
DE10228815 2002-06-27
DE10234460A DE10234460B3 (de) 2002-06-27 2002-07-29 Mehrfach-Abscherschraube
DE10234460 2002-07-29

Publications (3)

Publication Number Publication Date
EP1376764A2 EP1376764A2 (fr) 2004-01-02
EP1376764A3 EP1376764A3 (fr) 2005-09-21
EP1376764B1 true EP1376764B1 (fr) 2010-08-18

Family

ID=29718105

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030014617 Expired - Lifetime EP1376764B1 (fr) 2002-06-27 2003-06-26 Vis à amorces de rupture multiples

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Country Link
EP (1) EP1376764B1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004039811A1 (de) 2004-08-11 2006-02-23 Pfisterer Kontaktsysteme Gmbh & Co. Kg Befestigungsmittel, insbesondere Abreißschraube, zugehöriges System und Verfahren zum Eindrehen des Befestigungsmittels
FR2907859B1 (fr) * 2006-10-30 2008-12-19 Tyco Electronics Simel Soc Par Ensemble a vis a rupture programmee
PL1953397T3 (pl) 2007-01-26 2010-06-30 Arcus Elektrotechnik Alois Schiffmann Gmbh Śruba ze ścinanym łbem i sposób jej wytwarzania
DE102008039431B4 (de) * 2008-08-25 2013-08-29 Cellpack Gmbh Abreißschraube für Verbindungselemente von elektrischen Leitern
ES2355994A1 (es) * 2010-03-11 2011-04-01 Sofamel, S.A. Tornillo para conector eléctrico.
CN106041826A (zh) * 2016-08-04 2016-10-26 广西玉柴机器股份有限公司 温度场硬度塞的拆装工具
US11193522B2 (en) 2016-11-30 2021-12-07 3M Innovative Properties Company Shear bolt

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE159085T1 (de) 1994-07-15 1997-10-15 Limanin Establishment Abreissschraube

Also Published As

Publication number Publication date
EP1376764A2 (fr) 2004-01-02
EP1376764A3 (fr) 2005-09-21

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