EP0692643B1 - Vis frangible - Google Patents

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Publication number
EP0692643B1
EP0692643B1 EP94111058A EP94111058A EP0692643B1 EP 0692643 B1 EP0692643 B1 EP 0692643B1 EP 94111058 A EP94111058 A EP 94111058A EP 94111058 A EP94111058 A EP 94111058A EP 0692643 B1 EP0692643 B1 EP 0692643B1
Authority
EP
European Patent Office
Prior art keywords
section
tear
predetermined breaking
thread
screw
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
EP94111058A
Other languages
German (de)
English (en)
Other versions
EP0692643A1 (fr
EP0692643B2 (fr
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
Limanin Establishment
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8216121&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0692643(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Limanin Establishment filed Critical Limanin Establishment
Priority to AT94111058T priority Critical patent/ATE159085T1/de
Priority to EP94111058A priority patent/EP0692643B2/fr
Priority to DE59404282T priority patent/DE59404282D1/de
Priority to ES94111058T priority patent/ES2084567T1/es
Publication of EP0692643A1 publication Critical patent/EP0692643A1/fr
Application granted granted Critical
Publication of EP0692643B1 publication Critical patent/EP0692643B1/fr
Publication of EP0692643B2 publication Critical patent/EP0692643B2/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
    • 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 tear-off screw according to the preamble of claim 1.
  • tear-off screws with a head and a threaded section are known which, when tightened, shear or tear off at a predetermined breaking point between the head section and the threaded section with a torque that is greater than or equal to a tear-off torque.
  • the optimal screw or thread length depends on the size of the cable connector and the dimension, or on the cross-section or diameter of the cable. It is a major disadvantage of the known tear-off screws that, depending on the connector or cable lug and the respective degree of cable filling, tear-off screws with threaded sections of appropriate length must be selected.
  • the object of the invention is now to describe a tear-off screw which can be used in as many ways as possible and thus overcomes the disadvantages listed above.
  • the tear-off screw comprises a head section, a first and a second threaded section and a first predetermined breaking point between the head section and the first threaded section, and a second predetermined breaking point between the first and the second threaded section.
  • the second and the first threaded section are screwed in and tearing off only takes place at the first predetermined breaking point.
  • the second threaded section can be screwed in to clamp the conductors or cables.
  • the applied torque exceeds the tear-off torque of the first and / or the second predetermined breaking point.
  • the second predetermined breaking point breaks directly, but preferably the tear-off torque of the first breaking point is smaller than that of the second, so that the first predetermined breaking point breaks first and a torque for breaking the second via an attachment piece of the first threaded section to which a tool can be positively attached is transmitted, which is above the tear-off torque of the second predetermined breaking point.
  • the breakaway torques are values with tolerances. So if it has to be ensured that the the first and then the second predetermined breaking point breaks, the tolerance ranges of the two tear-off torques must not overlap, or they must lie next to each other.
  • the use of the multi-stage tear-off screws according to the invention is in no way restricted to the use in cable lugs or connectors.
  • they can also be used to attach security devices, such as grilles installed in front of windows.
  • security devices such as grilles installed in front of windows.
  • an area for the form-fitting attachment of a tool is attached to the attachment of an attachment area, the screw can no longer be unscrewed with a tool after shearing off a predetermined breaking point.
  • the first shearing must take place directly at the last predetermined breaking point, which still protrudes beyond the safety device.
  • the tear torques must therefore decrease from the head section to the foremost threaded section.
  • the tear-off point protrudes by a maximum of one thread section length, so that when selecting small section lengths, the screws always protrude only slightly after tearing off.
  • the contact pressure acting on the cable is determined by the predetermined tear-off torque.
  • the design of the tear-off screw allows the choice of the tear-off torque and thus the choice of the contact pressure.
  • the desired contact pressure must be set depending on the cable material and the number and arrangement of the cables to be connected, as well as on the design of the cable lug or connector, it is necessary to use screws with different tear-off torques to ensure optimal connections. With optimal connections, the cables are pressed together in such a way that on the one hand they are not damaged, but on the other hand there is a sufficiently high, permanent press contact that ensures a good electrical connection. It is now a further essential disadvantage of the screws according to the prior art that different screws must also be used for each tear-off torque.
  • the screws according to the invention with at least two predetermined breaking points have the further advantage that a different tear-off torque can be provided at each predetermined breaking point, and thus there is the possibility of selecting an advantageous contact pressure from at least two different forces.
  • the tear-off torques increase from the head section against the last screw section, so that one predetermined breaking point after the other can be sheared off until the desired pressing force assigned to the tear-off torque is reached.
  • the predetermined breaking point is preferably constructed as an annular connecting section, the ring thickness of which varies along the screw axis.
  • the connecting section with the smallest ring thickness preferably adjoins the subsequent threaded section, so that the breakage takes place directly in the area of the released threaded section end face.
  • the end pieces of the threaded sections which are designed for the form-fitting reception of a tool, are preferably designed as polygonal inner recesses, in particular hexagon recesses.
  • connection elements that are accessible from the outside, such as two parallel surfaces attached on both sides, can also be provided in the thread area, to which a tool for generating a torque can be applied.
  • FIG. 1 shows a tear-off screw 1 with a head section 2, a first threaded section 3, which adjoins the head section 2, and with a second threaded section 4, which adjoins the first threaded section 3.
  • the transition from the head section 2 to the first threaded section 3 or from the first threaded section 3 to the second threaded section 4 is formed by a first connecting section 5 or a second connecting section 6.
  • An inner recess 8 is preferably provided along a central screw axis 7 from the head section 2 through the first connecting section 5, the first threaded section 3 and the second connecting section 6. This recess in particular also extends at least partially into the second threaded section 4, which is terminated with a contact area 9 arranged at the free end.
  • the second thread 4 'and the first thread 3' are formed as sections of a single thread, so that they can be screwed into a common internal thread.
  • the first predetermined breaking point 10 is arranged in the first connecting section 5, preferably at its transition area to the first threaded section 3.
  • the second predetermined breaking point 11 is arranged in the transition area from the second connecting section 6 to the second threaded section 4.
  • This position of the predetermined breaking points 10, 11 results preferably from the outer edges of the respective connecting sections 5, 6 tapering towards the predetermined breaking points.
  • the inner recess 8 is designed, at least in sections, for the positive reception of tool heads, such as polygonal heads, in particular with a hexagonal cross section.
  • the cross section of the inner recess 8 is constant in the head section and in the first connecting section. In the subsequent first thread section it is smaller and in turn remains constant up to the second thread section. In the second threaded section, the cross section is even smaller, so that the tool that can be inserted into the various sections in a coherent manner has a smaller external dimension from section to section.
  • the decreasing cross-section was chosen to vary the tear-off torque. However, the desired different tear-off torques can optionally also be achieved with a cross section that is constant over the entire inner recess 8, for example by varying the extent of the outer surfaces in the area of the predetermined breaking points.
  • the invention is in no way limited to the preferred tear-off screws with internal recesses.
  • the inner recess 8 can be dispensed with.
  • FIG. 2 shows a tear-off screw with a head section 2, a first threaded section 3 and four further threaded sections 4a, 4b, 4c, 4d. Further predetermined breaking points are provided between each two thread sections 3, 4a-d, so that the screw 1 is screwed into threads of different lengths can and protrudes little at the first predetermined breaking point above the thread end.
  • 3a and 3b show the optimal usability of tear-off screws according to the invention in cable lugs and connectors with somewhat different dimensions and with different degrees of cable filling.
  • 3a two threaded sections 3, 4 are screwed into a thread 14 of a cable lug or connector 15.
  • the contact area 9 protrudes far into the cable area 17 provided for receiving the cables 16 because a multi-core cable 16 with only a small cross section is inserted.
  • the head section originally protruding over the cable lug or connector was sheared off at the first predetermined breaking point 10 by applying a sufficiently large torque.
  • a cable lug or connector 15 ' is equipped with a cable of larger cross-section, so that only the second threaded section 4 can be accommodated in the thread 14. After tearing off at the second predetermined breaking point 11, no screw section protrudes beyond the cable connector.
  • the contact pressure in FIG. 3a is lower than that in FIG. 3b.
  • the contact pressure for optimally connecting cables or conductors with smaller cross-sections should be chosen smaller than that for connecting cables or conductors with larger cross-sections. This need was taken into account by the choice of the different tear-off torques of the two predetermined breaking points 10, 11.
  • the tear-off screw according to the invention can be designed in a large number of embodiments.
  • the head section 2 can already be designed as a threaded section.
  • the tear-off screws are at least partially made of metal, in particular electrically conductive metal, such as brass, and / or plastic.

Landscapes

  • Organic Insulating Materials (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Multi-Conductor Connections (AREA)
  • Connections By Means Of Piercing Elements, Nuts, Or Screws (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Clamps And Clips (AREA)

Claims (9)

  1. Vis déchirable, comportant une section filetée (3) et une section tête (2) susceptible d'être séparée, y étant fixée par un point destiné à la rupture (10), caractérisée en ce qu'au moins une autre section filetée (4) et un autre point destiné à la rupture (11) sont prévus, les sections filetées (3, 4) se raccordant l'une à l'autre et étant respectivement reliées ensemble par un point destiné à la rupture (11).
  2. Vis déchirable selon la revendication 1, caractérisée en ce qu'une section de tête (2) et deux sections filetées (3, 4) sont prévues.
  3. Vis déchirable selon la revendication 1 ou 2, caractérisée en ce que les couples de déchirement menant au cisaillement se produisant aux différents points destinés à la rupture (10, 11), respectivement les zones à couples de déchirement, sont de grandeur différente, en particulier vont en augmentant en allant de la section tête (2) à la dernière section filetée (4d), respectivement se raccordent les unes aux autres.
  4. Vis déchirable selon l'une des revendications 1 à 3, caractérisée en ce qu'un évidement intérieur (8) s'étend de la section tête (2) à la section filetée (4d) la plus à l'avant et est réalisé pour recevoir avec ajustement de forme, au moins par sections, des têtes d'outil telles que des têtes à plusieurs pans, en particulier ayant une section transversale hexagonale.
  5. Vis déchirable selon l'une des revendications 1 à 4, caractérisée en ce que la section transversale de l'évidement intérieur (8) va en diminuant en allant de la section tête (2) à la section filetée (4d) la plus en avant, la diminution se faisant par degrés, de préférence dans une zone initiale, se raccordant au point destiné à la rupture, de chaque section filetée, ou bien le cas échéant reste sensiblement constante le long de l'évidement intérieur.
  6. Vis déchirable selon l'une des revendications 1 à 5, caractérisée en ce que la section transversale de la bordure extérieure des points destinés à la rupture (10, 11) reste constante ou bien va en augmentant, en allant de la section tête (2) à la section filetée (4d) la plus à l'avant.
  7. Vis déchirable selon l'une des revendications 1 à 6, caractérisée en ce que les points destinés à la rupture (10, 11) sont disposés dans des sections de liaison (5, 6) allant en s'effilant, à l'endroit où celles-ci ont leur diamètre extérieur minimal.
  8. Vis déchirable selon la revendication 7, caractérisée en ce que toutes les sections de liaison (5, 6) présentent des diamètres extérieurs minimaux sensiblement égaux.
  9. Vis déchirable selon l'une des revendications 1 à 8, caractérisée en ce que la vis déchirable est construite au moins partiellement en métal, en particulier en un métal conducteur de l'électricité, comme en laiton et/ou en matière synthétique.
EP94111058A 1994-07-15 1994-07-15 Vis frangible Expired - Lifetime EP0692643B2 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT94111058T ATE159085T1 (de) 1994-07-15 1994-07-15 Abreissschraube
EP94111058A EP0692643B2 (fr) 1994-07-15 1994-07-15 Vis frangible
DE59404282T DE59404282D1 (de) 1994-07-15 1994-07-15 Abreissschraube
ES94111058T ES2084567T1 (es) 1994-07-15 1994-07-15 Tornillo arrancable.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP94111058A EP0692643B2 (fr) 1994-07-15 1994-07-15 Vis frangible

Publications (3)

Publication Number Publication Date
EP0692643A1 EP0692643A1 (fr) 1996-01-17
EP0692643B1 true EP0692643B1 (fr) 1997-10-08
EP0692643B2 EP0692643B2 (fr) 2005-03-30

Family

ID=8216121

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94111058A Expired - Lifetime EP0692643B2 (fr) 1994-07-15 1994-07-15 Vis frangible

Country Status (4)

Country Link
EP (1) EP0692643B2 (fr)
AT (1) ATE159085T1 (fr)
DE (1) DE59404282D1 (fr)
ES (1) ES2084567T1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007130811A2 (fr) 2006-05-05 2007-11-15 3M Innovative Properties Company Borne tubulaire d'un câble
EP2608338A1 (fr) 2011-12-21 2013-06-26 3M Innovative Properties Company Dispositif de raccordement de terminal pour câble d'alimentation

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2157105T3 (es) 1998-08-18 2001-08-01 Petri Gerhard Gmbh & Co Kg Tornillo de cabeza arrancable.
DE19960198A1 (de) * 1999-12-14 2001-06-28 Pfisterer Kontaktsyst Gmbh Mittel zum Festlegen eines Gegenstandes, insbesondere Klemmschraube, Distanzierelement für ein solches Mittel und Schraubverbindungsklemme mit einem solchen Mittel
EP1376764B1 (fr) 2002-06-27 2010-08-18 Arcus Elektrotechnik Alois Schiffmann GmbH Vis à amorces de rupture multiples
DE10234460B3 (de) * 2002-06-27 2004-03-18 Arcus Elektrotechnik Alois Schiffmann Gmbh Mehrfach-Abscherschraube
DE10312147A1 (de) * 2003-03-17 2004-10-07 Pfisterer Kontaktsysteme Gmbh & Co. Kg Befestigungsmittel, insbesondere Abreißschraube, und zugehörige Schraubverbindungsklemme
DE102004039811A1 (de) 2004-08-11 2006-02-23 Pfisterer Kontaktsysteme Gmbh & Co. Kg Befestigungsmittel, insbesondere Abreißschraube, zugehöriges System und Verfahren zum Eindrehen des Befestigungsmittels
DE102005007384A1 (de) 2005-02-18 2006-08-31 Zf Friedrichshafen Ag Anordnung zur axialen Abstützung von zwei miteinander rotierenden Bauteilen
DE102006048177A1 (de) * 2006-10-10 2008-04-24 Pfisterer Kontaktsysteme Gmbh & Co. Kg Befestigungsmittel, insbesondere Abreißschraube, mit abtrennbarem Klemmabschnitt
ES2394511T3 (es) * 2006-12-12 2013-02-01 Nexans Dispositivo de fijación apto para ser cizallado con elemento de transmisión de fuerza
ES2341135T3 (es) * 2007-12-11 2010-06-15 Nexans Tornillo con cizalladura.
DE102008039431B4 (de) 2008-08-25 2013-08-29 Cellpack Gmbh Abreißschraube für Verbindungselemente von elektrischen Leitern
DE102009009793A1 (de) * 2009-02-20 2010-08-26 Südkabel GmbH Kabelverbinder
DE102009030662A1 (de) * 2009-06-25 2010-12-30 Hager Electro Gmbh & Co. Kg Schraubklemmanschlussvorrichtung, insbesondere für den Anschluss eines Stromkabels an eine Stromzählerinstallation
CA2916569A1 (fr) 2013-06-26 2014-12-31 3M Innovative Properties Company Dispositif de raccordement terminal de cable d'alimentation
US9689416B2 (en) * 2014-12-04 2017-06-27 Classic Connectors, Inc. Torque limiting set screw
DE102015102222A1 (de) 2015-02-17 2016-08-18 Cellpack Gmbh Befestigungsmittel für Verbindungselemente für elektrische Leiter, beispielsweise Schraubkabelschuhe oder Schraubverbinder
DE102015102224B4 (de) 2015-02-17 2021-04-29 Bbc Cellpack Gmbh Befestigungsmittel für Verbindungselemente für elektrische Leiter und Verbindungselement mit einem solchen Befestigungsmittel
DE102015102223A1 (de) 2015-02-17 2016-08-18 Cellpack Gmbh Befestigungsmittel für Verbindungselemente für elektrische Leiter und Verbindungselement mit einem solchen Befestigungsmittel
DE102015116301A1 (de) * 2015-09-25 2017-03-30 Voss Automotive Gmbh "Verschlussschraube"
WO2018102118A1 (fr) 2016-11-30 2018-06-07 3M Innovative Properties Company Boulon de cisaillement
EP3974666B1 (fr) 2020-09-25 2023-08-23 Nexans Vis de cisaillement

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444775A (en) * 1968-02-16 1969-05-20 Lockheed Aircraft Corp Nut formed with multiple torque-off collars
US3937121A (en) * 1975-04-14 1976-02-10 Pitney-Bowes, Inc. Double break-off screw
DE9011571U1 (de) * 1990-08-08 1991-01-03 Gerhard Petri Gmbh + Co. Kg, 8670 Hof Abreißkopfschraube
DE4116876A1 (de) † 1991-05-23 1992-11-26 Arcus Elektrotech Kontaktschraube
GB9404979D0 (en) † 1994-03-15 1994-04-27 Sicame Electrical Dev Ltd Improvements relating to clamping screws

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007130811A2 (fr) 2006-05-05 2007-11-15 3M Innovative Properties Company Borne tubulaire d'un câble
US7767909B2 (en) 2006-05-05 2010-08-03 3M Innovative Properties Company Tubular terminal for a cable
EP2608338A1 (fr) 2011-12-21 2013-06-26 3M Innovative Properties Company Dispositif de raccordement de terminal pour câble d'alimentation
WO2013096354A1 (fr) 2011-12-21 2013-06-27 3M Innovative Properties Company Dispositif de connexion de borne pour câble d'alimentation électrique
EP2698891A1 (fr) 2011-12-21 2014-02-19 3M Innovative Properties Company Dispositif de connexion de borne pour un câble électrique

Also Published As

Publication number Publication date
EP0692643A1 (fr) 1996-01-17
ATE159085T1 (de) 1997-10-15
EP0692643B2 (fr) 2005-03-30
ES2084567T1 (es) 1996-05-16
DE59404282D1 (de) 1997-11-13

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