EP0692643B2 - Shearable screw - Google Patents
Shearable screw Download PDFInfo
- Publication number
- EP0692643B2 EP0692643B2 EP94111058A EP94111058A EP0692643B2 EP 0692643 B2 EP0692643 B2 EP 0692643B2 EP 94111058 A EP94111058 A EP 94111058A EP 94111058 A EP94111058 A EP 94111058A EP 0692643 B2 EP0692643 B2 EP 0692643B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- predetermined breaking
- tear
- breaking point
- 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
Links
- 238000010008 shearing Methods 0.000 claims description 6
- 239000002184 metal Substances 0.000 claims description 4
- 229910001369 Brass Inorganic materials 0.000 claims description 2
- 239000010951 brass Substances 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims description 2
- 230000003247 decreasing effect Effects 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract 1
- 230000007704 transition Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000001419 dependent effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
Images
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.
- the object of the invention is now to to describe a tear-off screw as possible is versatile and thus the above listed Overcomes disadvantages.
- the inventive solution provides, among others, that in addition to the Head section and the it over a first predetermined breaking point fixed first threaded portion at least another threaded section and another predetermined breaking point are provided, wherein the threaded portions connect to each other and each one over Predetermined breaking point are interconnected.
- the tearing screw includes a version Head portion, a first and a second threaded portion and a first predetermined breaking point between the head portion and the first threaded portion, and a second predetermined breaking point between the first and the second threaded portion. For a cable lug or connectors with only small cross sections or diameters becomes the second and the first threaded portion screwed in and the tearing off takes place only at the first predetermined breaking point.
- Analog can be used at Screws with multiple threaded sections shearing off all completely over the cable sheath or connector projecting threaded sections.
- the breakaway torques are Values with tolerances. If so, be sure must first that first and then the second predetermined breaking point breaks, so the tolerance ranges the two breakaway torques do not overlap, or they must be next to each other.
- the use of the novel multi-stage Tear-off screws is by no means on the use restricted in cable lugs or connectors.
- the demolition site is a maximum of one threaded section length before, so that when choosing small section lengths the Always slightly protrude screws after tearing off.
- the innovative screws with at least two Predetermined breaking points have the further advantage that at each Breaking point another tearing torque can be provided, and thus the possibility exists a most favorable contact force of at least two to select different forces.
- the preferred Execution take the tearing torques off Head section against the last screw section too, so that one breaking point is sheared off after the other can be, until the tearing torque associated desired contact force is reached.
- the predetermined breaking point is preferably as annular Connection section constructed, the ring thickness varies along the screw axis. Preferably closes the connecting section with the smallest Ring thickness to the subsequent threaded section, so that the break directly in the area of the released Threaded section end face takes place. It goes without saying by itself, that any other suitable one skilled in the art known breaking points are provided can. In addition to the predetermined breaking points with narrowed, or diluted, bodies are also with predetermined breaking points softer and / or brittle materials possible.
- the extensions of the threaded sections to the formed positively receiving a tool are preferred as polygonal recesses, in particular hexagonal recesses, educated.
- externally accessible connection elements such as two parallel faces attached on both sides, be provided to which a tool for generating a torque can be applied.
- Fig. 1 shows a tear-off screw 1 with a head portion 2, a first threaded portion 3, the the head section 2 connects, and with a second Threaded portion 4, which at the first threaded portion 3 connects.
- the transition from the head section 2 to the first threaded portion 3, or from the first threaded portion 3 to the second threaded portion 4 is by a first connection section 5, or a second connecting portion 6 is formed.
- a first connection section 5, or a second connecting portion 6 is formed.
- a Interior recess 8 is provided. This recess extends in particular at least partially in the second threaded portion 4, with a arranged at the free end contact area 9 completed is.
- the second thread 4 'and the first thread 3'sind as sections of a single thread designed so that they are in a common internal thread can be screwed.
- the first predetermined breaking point 10 is in the first connecting section 5, preferably at its transition region arranged to the first threaded portion 3.
- the second predetermined breaking point 11 in the transition region of the second connecting portion 6 to the second Threaded portion 4 is arranged.
- This location of Predetermined breaking points 10,11 preferably results from the external boundaries tapering against the predetermined breaking points the respective connecting sections 5.6.
- the cross section of the inner recess 8 reduced from the head portion 2 against the contact portion 9 and the outer boundaries of the connecting sections 5.6 are formed substantially the same, is the tearing torque of the first predetermined breaking point 10 smaller due to a small first ring thickness 12 as that of the second predetermined breaking point 11 with a larger one second ring thickness 13.
- the ring thickness also by the addition, or decrease of the outer boundary cross section of a predetermined breaking point to the other can be varied.
- the inner recess 8 is at least in sections for the positive reception of tool heads, such as polygonal heads, especially with hexagonal cross section, formed.
- tool heads such as polygonal heads, especially with hexagonal cross section
- first Thread section he is smaller and stays up again constant to the second thread section.
- the cross section is again smaller, so that forms into the different sections conclusively usable tool from section to section smaller outer mass has.
- the downsizing Cross section was chosen to the tearing torque to vary. The desired different However, tear-off torques may occur even at a over the entire inner recess. 8 constant cross section, such as by varying the Expansion of the external surfaces in the area of the predetermined breaking points, be achieved.
- the invention is by no means the preferred one Tear-off screws with internal recesses restricted.
- attack surfaces provided for the positive application of a tool can be omitted on the inner recess 8 become.
- Fig. 2 shows a tear-off screw with a head portion 2, a first threaded portion 3 and four further threaded portions 4a, 4b, 4c, 4d. Between two threaded sections 3, 4a-d are further predetermined breaking points provided so that the screw 1 in different long threads are screwed in can and after shearing at the first breaking point only slightly protrudes beyond the threaded end.
- Fig. 3a and 3b show the optimal usability of inventive tearing screws in cable lugs and connectors with something different Expansion and with different Jardin buoy.
- Fig. 3a are two threaded sections 3,4 in a thread Screwed 14 of a cable lug or connector 15.
- the contact area 9 extends far into the, to Receiving the cable 16 provided, cable area 17 before, because a multi-core cable 16 with only a small Cross-section is introduced.
- Fig. 3b is a cable lug or connector 15 ' equipped with a cable of larger cross section, so that only the second threaded portion 4 in the thread 14 place finds. After demolishing at the second Predetermined breaking point 11 is no longer a screw section via the cable connector.
- the inventive tearing screw can in a variety of embodiments are formed.
- the tear-off screws exist at least partially of metal, in particular electrically conductive metal, about 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)
Abstract
Description
Die Erfindung bezieht sich auf eine Abreissschraube nach dem Oberbegriff des Anspruchs 1.The invention relates to a tear-off screw according to the preamble of claim 1.
Zum Verbinden von Kabeln werden Schraubverbinder, Kabelverbindungsklemmen, oder Kabelschuhe verwendet, in welche zum Festklemmen der Kabel Abreissschrauben eingeschraubt werden. Aus der EP 470 388 A2 sind Abreissschrauben mit einem Kopf- und einem Gewindeabschnitt bekannt, die beim Festschrauben mit einem Drehmoment, das grösser oder gleich einem Abreissdrehmoment ist, an einer Sollbruchstelle zwischen dem Kopfabschnitt und dem Gewindeabschnitt abscheren, bzw. abreissen. Die optimale Schrauben-, bzw. Gewindelänge hängt von der Grösse des Kabelverbinders und der Dimension, bzw. vom Querschnitt oder Durchmesser des Kabels ab. Es ist ein wesentlicher Nachteil der bekannten Abreissschrauben, dass abhängig vom Verbinder oder Kabelschuh und vom jeweiligen Kabelfüllgrad Abreissschrauben mit Gewindeabschnitten entsprechender Länge gewählt werden müssen. Steht ein Schraubenteil über den Verbinder oder Kabelschuh vor, so besteht etwa nach dem Überziehen eines isolierenden Schrumpfschlauches die Gefahr, das der Schlauch mechanisch oder durch Funkenschlag verletzt wird und eine offene Kontaktstelle entsteht. Es müssen also Schrauben mit unterschiedlichen Gewindelänge hergestellt werden. Nebst der Herstellung ist auch die Lagerung und die Montage verschiedener Schraubenlängen aufwendig. Zudem besteht immer die Gefahr, dass erst beim Festschrauben erkannt wird, dass eine andere Schraubenlänge verwendet werden muss.For connecting cables, screw connectors, Cable connection terminals, or cable lugs used in which for tying the cable tearing screws be screwed. From EP 470 388 A2 are tearing screws with a head and a Threaded section known when tightening with a torque greater than or equal to one Tear off torque is at a predetermined breaking point between the head portion and the threaded portion shear off, or tear off. The optimal Screw or thread length depends on the size the cable connector and the dimension, or of the Cross-section or diameter of the cable from. It is a substantial disadvantage of the known tear-off screws, that depends on the connector or cable lug and the respective Kabelfüllgrad tear screws with Selected threaded sections of appropriate length Need to become. Is a screw part over the connector or cable lug, it is about after Covering an insulating shrink tube the risk that the hose is mechanical or through Sparking is injured and an open contact point arises. So you have screws with different Thread length can be produced. Besides the Production is also the storage and the assembly of different Screw lengths consuming. There is also always the danger that only when tightening is recognized that uses a different screw length must become.
Die erfindungsgemässe Aufgabe besteht nun darin, eine Abreissschraube zu beschreiben, die möglichst vielseitig verwendbar ist und somit die oben aufgeführten Nachteile überwindet.The object of the invention is now to to describe a tear-off screw as possible is versatile and thus the above listed Overcomes disadvantages.
Die Erfindung löst die Aufgabe durch die Merkmale
der Ansprüche 1 oder 3.The invention solves the problem by the features
of
Die erfinderische Lösung sieht unter anderen vor, dass nebst dem Kopfabschnitt und dem daran über eine erste Sollbruchstelle befestigten ersten Gewindeabschnitt mindestens ein weiterer Gewindeabschnitt und eine weitere Sollbruchstelle vorgesehen sind, wobei die Gewindeabschnitte aneinander anschliessen und jeweils über eine Sollbruchstelle miteinander verbunden sind. In einer bevorzugten Ausführung umfasst die Abreissschraube einen Kopfabschnitt, einen ersten und einen zweiten Gewindeabschnitt und eine erste Sollbruchstelle zwischen dem Kopfabschnitt und dem ersten Gewindeabschnitt, sowie eine zweite Sollbruchstelle zwischen dem ersten und dem zweiten Gewindeabschnitt. Bei einem Kabelschuh oder Verbinder mit nur kleinen Querschnitten oder Durchmessern wird der zweite und der erste Gewindeabschnitt eingeschraubt und das Abreissen erfolgt nur an der ersten Sollbruchstelle.The inventive solution provides, among others, that in addition to the Head section and the it over a first predetermined breaking point fixed first threaded portion at least another threaded section and another predetermined breaking point are provided, wherein the threaded portions connect to each other and each one over Predetermined breaking point are interconnected. In a preferred The tearing screw includes a version Head portion, a first and a second threaded portion and a first predetermined breaking point between the head portion and the first threaded portion, and a second predetermined breaking point between the first and the second threaded portion. For a cable lug or connectors with only small cross sections or diameters becomes the second and the first threaded portion screwed in and the tearing off takes place only at the first predetermined breaking point.
Wenn in Kabelschuhe oder Verbinder Leiter, bzw. Kabel mit grossen Querschnitten, bzw. Durchmessern, eingesetzt sind, kann zum Festklemmen der Leiter, bzw. Kabel lediglich der zweite Gewindeabschnitt eingeschraubt werden. Bei einer weiterführenden Schraubbewegung übersteigt das angewendete Drehmoment das Abreissdrehmoment der ersten und/oder der zweiten Sollbruchstelle. Gegebenenfalls bricht direkt die zweite Sollbruchstelle, vorzugsweise aber ist das Abreissdrehmoment der ersten Bruchstelle kleiner als jenes der zweiten, so dass zuerst die erste Sollbruchstelle bricht und zum Brechen der zweiten über ein Ansatzstück des ersten Gewindeabschnittes, an das formschlüssig ein Werkzeug angelegbar ist, ein Drehmoment übertragen wird, das über dem Abreissdrehmoment der zweiten Sollbruchstelle liegt. Analog kann bei Schrauben mit mehreren Gewindeabschnitten das Abscheren aller vollständig über den Kabelshuh oder Verbinder vorstehender Gewindeabschnitte erfolgen. Die Abreissdrehmomente aller Sollbruchstellen nehmen vom Kopfabschnitt zum letzten, bzw. vordersten, Gewindeabschnitt zu oder ab, gegebenenfalls sind sie aber im wesentliche gleich gross. In der bevorzugten Ausführung nehmen sie zu, so dass eine Sollbruchstelle nach der anderen abgeschert werden muss bis keine mehr über den Kabelschuh oder Verbinder, bzw. dessen Gewinde, vorsteht. Falls sie abnehmen, bricht direkt die letzte über den Kabelschuh oder Verbinder vorstehende Sollbruchstelle.If in cable lugs or connectors ladder, or Cables with large cross sections or diameters, can be used to clamp the ladder, or Cable only the second threaded portion screwed become. In a continuing screwing movement exceeds the applied torque the tearing torque of the first and / or the second Breaking point. If necessary, breaks directly second predetermined breaking point, but preferably is the tearing torque the first breakpoint smaller than that the second, so first the first breaking point breaks and breaks the second over an extension the first threaded portion, to the form-fitting a tool can be applied, a torque is transferred, which is above the breakaway torque the second predetermined breaking point is located. Analog can be used at Screws with multiple threaded sections shearing off all completely over the cable sheath or connector projecting threaded sections. The Tear off torques of all predetermined breaking points from the head portion to the last, or foremost, threaded portion to or from, but they are essentially the same size. In the preferred embodiment take it, leaving a breaking point after the other has to be sheared off to none more about the cable lug or connector, or its Thread, protruding. If they lose weight, they break right away last projecting over the cable lug or connector Breaking point.
Bei den Abreissdrehmomenten handelt es sich um Werte mit Toleranzen. Wenn also sichergestellt werden muss dass zuerst die erste und erst anschliessend die zweite Sollbruchstelle bricht, so dürfen die Toleranzbereiche der beiden Abreissdrehmomente nicht überlappen, bzw. sie müssen nebeneinander liegen.The breakaway torques are Values with tolerances. If so, be sure must first that first and then the second predetermined breaking point breaks, so the tolerance ranges the two breakaway torques do not overlap, or they must be next to each other.
Die Verwendung der erfindungsgemässen mehrstufigen Abreissschrauben ist keineswegs auf die Verwendung in Kabelschuhen oder Verbindern eingeschränkt. Sie können beispielsweise auch zum Befestigen von Sicherheitseinrichtungen, wie etwa vor Fenster montierte Gitter, verwendet werden. Indem gegebenenfalls an den Gewindeabschnitten auf ein Anbringen eines Ansatzbereiches bereiches für das formschlüssige Ansetzen eines Werkzeuges wird, kann nach dem Abscheren einer Sollbruchstelle die Schraube nicht mehr mit einem Werkzeug herausgeschraubt werden. Bei dieser Anwendung muss das erste Abscheren direkt an der letzten Sollbruchstelle erfolgen, die noch über die Sicherheitseinrichtung vorsteht. Daher müssen in diesem Fall die reissdrehmomente vom Kopfabschnitt zum vordersten Gewindeabschnitt abnehmen. Die Abrissstelle steht maximal um eine Gewindeabschnittlänge vor, so dass bei der Wahl kleiner Abschnittslängen die Schrauben nach dem Abreissen immer nur wenig vorstehen.The use of the novel multi-stage Tear-off screws is by no means on the use restricted in cable lugs or connectors. For example, you can also attach it of safety devices, such as in front of windows mounted grids are used. If necessary at the threaded sections on attaching a Approach area for the positive locking Applying a tool can after shearing off a predetermined breaking point the screw is no longer be unscrewed with a tool. at This application needs the first shearing directly on the last predetermined breaking point, which is still on the Safety device protrudes. Therefore, in this Case the tearing torques from the head section to remove the first threaded section. The demolition site is a maximum of one threaded section length before, so that when choosing small section lengths the Always slightly protrude screws after tearing off.
Gemäss dem Stande der Technik ist die auf die Kabel wirkende Anpresskraft durch das eine vorgegebene Abreissdrehmoment bestimmt. Die Ausgestaltung der Abreissschraube, ermöglicht zwar die Wahl des Abreissdrehmomentes und somit die Wahl der Anpresskraft. Da die gewünschte Anpresskraft aber abhängig vom Kabelmaterial und der Anzahl und Anordnung der zu verbindenden Kabel, sowie von der Ausbildung des Kabelschuhs oder Verbinders eingestellt werden muss, ist es zum Gewährleisten von optimalen Verbindungen nötig, Schrauben mit unterschiedlichen Abreissdrehmomenten zu verwenden. Bei optimalen Verbindungen werden die Kabel so zusammengepresst, dass sie einerseits nicht beschädigt werden, andererseits aber ein genügend hoher, dauerhafter Presskontakt entsteht, der eine gute elektrische Verbindung gewährleistet. Es ist nun ein weiterer wesentlicher Nachteil der Schrauben gemäss dem Stande der Technik, dass auch für jedes Abreissdrehmoment unterschiedliche Schrauben verwendet werden müssen.According to the state of the art, this is on the cables acting contact pressure by the one given Tear-off torque determined. The design of the Tear-off screw, although allows the choice of the tearing torque and thus the choice of contact pressure. As the desired contact force but dependent of the cable material and the number and arrangement of cables to be connected, as well as the training of the Cable lug or connector must be adjusted, it is to ensure optimal connections necessary, screws with different breakaway torques to use. For optimal connections the cables are pressed together so that on the one hand not damaged, but on the other hand sufficiently high, lasting press contact arises, which ensures a good electrical connection. It is now another major disadvantage of the screws according to the prior art that also for each Tear off torque different screws must be used.
Die erfinderischen Schrauben mit mindestens zwei Sollbruchstellen haben den weiteren Vorteil, dass an jeder Sollbruchstelle ein anderes Abreissdrehmoment vorgesehen werden kann, und somit die Möglichkeit besteht eine günstigste Anpresskraft aus mindestens zwei verschiedenen Kräften auszuwählen. In der bevorzugten Ausführung nehmen die Abreissdrehmomente vom Kopfabschnitt gegen den letzten Schraubenabschnitt zu, so dass eine Sollbruchstelle nach der anderen abgeschert werden kann, bis die dem Abreissmoment zugeordnete gewünschte Anpresskraft erreicht ist.The innovative screws with at least two Predetermined breaking points have the further advantage that at each Breaking point another tearing torque can be provided, and thus the possibility exists a most favorable contact force of at least two to select different forces. In the preferred Execution take the tearing torques off Head section against the last screw section too, so that one breaking point is sheared off after the other can be, until the tearing torque associated desired contact force is reached.
Die Sollbruchstelle ist bevorzugt als ringförmiger Verbindungsabschnitt aufgebaut, dessen Ringdicke entlang der Schraubenachse variiert. Vorzugsweise schliesst der Verbindungsabschnitt mit der kleinsten Ringdicke an den nachfolgenden Gewindeabschnitt an, so dass der Bruch direkt im Bereich der freiwerdenden Gewindeabschnitt-Stirnfläche erfolgt. Es versteht sich von selbst, dass beliebige andere geeignete dem Fachmann bekannte Sollbruchstellen vorgesehen werden können. Nebst den Sollbruchstellen mit verengengten, bzw. verdünnten, Stellen sind auch Sollbruchstellen mit weicheren und/oder brüchigeren Materialien möglich.The predetermined breaking point is preferably as annular Connection section constructed, the ring thickness varies along the screw axis. Preferably closes the connecting section with the smallest Ring thickness to the subsequent threaded section, so that the break directly in the area of the released Threaded section end face takes place. It goes without saying by itself, that any other suitable one skilled in the art known breaking points are provided can. In addition to the predetermined breaking points with narrowed, or diluted, bodies are also with predetermined breaking points softer and / or brittle materials possible.
Die Ansatzstücke der Gewindeabschnitte die zur formschlüssigen Aufnahme eines Werkzeuges ausgebildet sind, sind bevorzugt als mehrkantige Innenausnehmungen, insbesondere Sechskantausnehmungen, ausgebildet. Gegebenenfalls können auch im Gewindebereich von aussen zugängliche Anschlusselemente, wie etwa zwei beidseits angebrachte parallele Flächen, vorgesehen werden, an die ein Werkzeug zum erzeugen eines Drehmomentes angelegt werden kann.The extensions of the threaded sections to the formed positively receiving a tool are preferred as polygonal recesses, in particular hexagonal recesses, educated. Optionally, also in the threaded area externally accessible connection elements, such as two parallel faces attached on both sides, be provided to which a tool for generating a torque can be applied.
Die Zeichnungen erläutern die Erfindung anhand von schematisch dargestellten Ausführungsformen.
- Fig. 1:
- Abreisschraube mit einem Kopfabschnitt, zwei Gewindeabschnitten und zwei Sollbruchstellen
- Fig. 2:
- Abreisschraube mit einem Kopfabschnitt, fünf windeabschnitten und fünf Sollbruchstellen
- Fig. 3a:
- Querschnitt durch einen Kabelschuh oder Verbinder in den zum Festklemmen eines Leiters mit kleinem Querschnitt zwei Gewindeabschnitte einer Abreissschraube eingeschraubt sind
- Fig. 3a:
- Querschnitt durch einen Kabelschuh oder Verbinder in den zum Festklemmen eines Leiters mit grossem Querschnitt nur ein Gewindeabschnitt einer Abreissschraube eingeschraubt ist
- Fig. 1:
- Unscrewing screw with one head section, two threaded sections and two predetermined breaking points
- Fig. 2:
- Unscrewing bolt with one head section, five wind sections and five predetermined breaking points
- Fig. 3a:
- Cross section through a cable lug or connector are screwed into the clamped for clamping a conductor with a small cross-section two threaded portions of a tear-off
- Fig. 3a:
- Cross-section through a cable lug or connector into which only a threaded portion of a tear-off screw is screwed for clamping a conductor with a large cross-section
Fig. 1 zeigt eine Abreissschraube 1 mit einem Kopfabschnitt
2, einem ersten Gewindeabschnitt 3, der an
den Kopfabschnitt 2 anschliesst, und mit einem zweiten
Gewindeabschnitt 4, der an den ersten Gewindeabschnitt
3 anschliesst. Der Übergang vom Kopfabschnitt
2 zum ersten Gewindeabschnitt 3, bzw. vom ersten Gewindeabschnitt
3 zum zweiten Gewindeabschnitt 4 wird
durch einen ersten Verbindungsabschnitt 5, bzw. einen
zweiten Verbindungsabschnitt 6 gebildet. Vorzugsweise
ist entlang einer zentralen Schraubenachse 7 vom Kopfabschnitt
2 durch den ersten Verbindungs- 5, den ersten
Gewinde- 3 und den zweiten Verbindungsabschnitt 6 eine
Innenausnehmung 8 vorgesehen. Diese Ausnehmung
erstreckt sich insbesondere auch zumindest teilweise
in den zweiten Gewindeabschnitt 4, der mit einem
am freien Ende angeordneten Kontaktbereich 9 abgeschlossen
ist. Das zweite Gewinde 4' und das erste Gewinde
3'sind als Abschnitte eines einzigen Gewindes
ausgebildet, so dass sie in ein gemeinsames Innengewinde
geschraubt werden können.Fig. 1 shows a tear-off screw 1 with a
Die erste Sollbruchstelle 10 ist im ersten Verbindungsabschnitt
5, vorzugsweise an dessen Übergangsbereich
zum ersten Gewindeabschnitt 3 angeordnet.
Analog ist die zweite Sollbruchstelle 11 im Übergangsbereich
des zweiten Verbindungsabschnitts 6 zum zweiten
Gewindeabschnitt 4 angeordnet. Diese Lage der
Sollbruchstellen 10,11 ergibt sich vorzugsweise durch
die sich gegen die Sollbruchstellen verjüngenden Aussenberandungen
der jeweiligen Verbindungsabschnitte
5,6. Indem sich der Querschnitt der Innenausnehmung
8 vom Kopfabschnitt 2 gegen den Kontaktbereich 9 verkleinert
und die Aussenberandungen der Verbindungsabschnitte
5,6 im wesentlichen gleich ausgebildet sind,
ist das Abreissdrehmoment der ersten Sollbruchstelle
10 aufgrund einer kleinen ersten Ringdicke 12 kleiner
als jenes der zweiten Sollbruchstelle 11 mit einer grösseren
zweiten Ringdicke 13. Es versteht sich von selbst,
dass die Ringdicke auch durch das Zu-, bzw. Abnehmen
des Aussenberandungsquerschnittes von einer Sollbruchstelle
zur anderen variiert werden kann.The first
Die Innenausnehmung 8 ist zumindest abschnittweise zur formschlüssigen Aufnahme von Werkzeugköpfen, wie etwa Mehrkantköpfen, insbesondere mit sechseckigem Querschnitt, ausgebildet. In der dargestellten Ausführung ist der Querschnitt der Innenausnehmung 8 im Kopfabschnitt und im ersten Verbindungsabschnitt konstant. Im anschliessenden ersten Gewindeabschnitt ist er kleiner und bleibt wiederum bis zum zweiten Gewindeabschnitt konstant. Im zweiten Gewindeabschnitt ist der Querschnitt nochmals kleiner, so dass das in die verschiedenen Abschnitte formt schlüssig einsetzbare Werkzeug von Abschnitt zu Abschnitt kleinere Aussenmasse hat. Der sich verkleinernde Querschnitt wurde gewählt, um das Abreissdrehmoment zu variieren. Die gewünschten unterschiedlichen Abreissdrehmomente können aber gegebenenfalls auch bei einem über die ganze Innenausnehmung 8 konstanten Querschnitt, etwa durch das Variieren der Ausdehnung der Aussenflächen im Bereich der Sollbruchstellen, erreicht werden.The inner recess 8 is at least in sections for the positive reception of tool heads, such as polygonal heads, especially with hexagonal cross section, formed. In the illustrated Execution is the cross section of the inner recess 8 in the head section and in the first connecting section constant. In the following first Thread section, he is smaller and stays up again constant to the second thread section. In the second Thread section, the cross section is again smaller, so that forms into the different sections conclusively usable tool from section to section smaller outer mass has. The downsizing Cross section was chosen to the tearing torque to vary. The desired different However, tear-off torques may occur even at a over the entire inner recess. 8 constant cross section, such as by varying the Expansion of the external surfaces in the area of the predetermined breaking points, be achieved.
Die Erfindung ist keineswegs auf die bevorzugten Abreissschrauben mit Innenausnehmungen eingeschränkt. Indem etwa aussen am Kopfabschnitt und an den Gewindeabschnitten angeordnete Angriffsflachen für das formschlüssige Anlegen eines Werkzeuges vorgesehen werden, kann auf die Innenausnehmung 8 verzichtet werden.The invention is by no means the preferred one Tear-off screws with internal recesses restricted. For example, outside at the head section and at the threaded portions arranged attack surfaces provided for the positive application of a tool can be omitted on the inner recess 8 become.
Fig. 2 zeigt eine Abreissschraube mit einem Kopfabschnitt
2, einem ersten Gewindeabschnitt 3 und vier
weiteren Gewindeabschnitten 4a, 4b, 4c, 4d. Zwischen
je zwei Gewindeabschnitten 3, 4a-d sind weitere Sollbruchstellen
vorgesehen, so dass die Schraube 1 in unterschiedlich
lange Gewinde eingeschraubt werden
kann und nach dem Abscheren an der ersten Sollbruchstelle
über dem Gewindeende nur wenig vorsteht.Fig. 2 shows a tear-off screw with a
Fig. 3a und 3b zeigen die optimale Einsetzbarkeit
von erfindungsgemässen Abreissschrauben bei Kabelschuhen
und Verbindern mit etwas unterschiedlicher
Ausdehnung und bei unterschiedlichem Kabelfüllgrad.
In Fig. 3a sind zwei Gewindeabschnitte 3,4 in ein Gewinde
14 eines Kabelschuhes oder Verbinders 15 eingeschraubt.
Der Kontaktbereich 9 ragt weit in den, zum
Aufnehmen der Kabel 16 vorgesehenen, Kabelbereich
17 vor, weil ein mehradriges Kabel 16 mit nur kleinem
Querschnitt eingeführt ist. Der ursprünglich über den
Kabelschuh oder Verbinder vorstehende Kopfabschnitt
wurde an der ersten Sollbruchstelle 10 durch das Anwenden
eines genügend grossen Drehmomentes abgeschert.
In Fig. 3b ist ein Kabelschuh oder Verbinder 15'
mit einem Kabel grösseren Querschnitts bestückt, so
dass lediglich der zweite Gewindeabschnitt 4 im Gewinde
14 Platz findet. Nach dem Abreissen an der Zweiten
Sollbruchstelle 11 steht kein Schraubenabschnitt mehr
über den Kabelverbinder vor.Fig. 3a and 3b show the optimal usability
of inventive tearing screws in cable lugs
and connectors with something different
Expansion and with different Kabelfüllgrad.
In Fig. 3a are two threaded
Da das Abreissdrehmoment, das zum Bruch der ersten
Sollbruchstelle 10 führt, kleiner ist als jenes das
zum Bruch der zweiten Sollbruchstelle 11 führt, ist der
Anpressdruck in Fig. 3a kleiner als jener in Fig. 3b. Der
Anpressdruck zum optimalen Verbinden von Kabeln,
bzw. Leitern, mit kleineren Querschnitten sollte kleiner
gewählt werden, als jener zum Verbinden von Kabeln,
bzw. Leitern, mit grösseren Querschnitten. Diesem Bedürfniss
wurde durch die Wahl der unterschiedlichen
Abreissdrehmomente der beiden Sollbruchstellen 10,11
Rechnung getragen.As the breakaway torque, leading to breakage of the first
Predetermined breaking point leads 10, smaller than that is the
leads to the breakage of the second
Die erfindungsgemässe Abreissschraube kann in
einer Vielzahl von Ausführungsformen ausgebildet werden.
Insbesondere kann etwa der Kopfabschnitt 2 bereits
als Gewindeabschnitt ausgebildet werden.The inventive tearing screw can in
a variety of embodiments are formed.
In particular, about the
Die Abreissschrauben bestehen zumindest teilweise aus Metall, insbesondere elektrisch leitendem Metall, etwa Messing, und/oder aus Kunststoff.The tear-off screws exist at least partially of metal, in particular electrically conductive metal, about brass, and / or plastic.
Claims (9)
- A tear-off screw having a thread section (3) and a detachable head section (2) attached thereto via a predetermined breaking point (10),
wherein at least one further thread section (4) and one further predetermined breaking point (11) are provided,
wherein the thread sections (3, 4) are adjacent to each other and are each connected to the other via a predetermined breaking point (11), and
wherein an inner recess (8) extends from the head section (2) into the foremost thread section (4d) with a stepwise decreasing cross-section, each preferably in that initial region of each thread section which is adjacent to the predetermined breaking point, wherein the inner recess is formed, at least in sections, for accommodating tool heads in a form-fitting manner. - The tear-off screw according to claim 1,
characterized in that the tearing torques or tearing torque ranges leading to shearing at the individual predetermined breaking points (10, 11) are of different magnitudes, in particular increase or are adjacent to each other from the head section (2) to the final thread section (4d). - A tear-off screw having a thread section (3) and a detachable head section (2) attached thereto via a predetermined breaking point (10),
characterized in that at least one further thread section (4) and one further predetermined breaking point (11) are provided, wherein the thread sections (3, 4) are adjacent to each other and are each connected to the other via a predetermined breaking point (11), and
wherein the tearing torques or tearing torque ranges leading to shearing at the individual predetermined breaking points (10, 11) are of different magnitudes, in particular increase or are adjacent to each other from the head section (2) to the final thread section (4d). - The tear-off screw according to claim 3,
characterized in that an inner recess (8) extends from the head section (2) into the foremost thread section (4d) and is formed, at least in sections, for accommodating tool heads, such as polygonal heads, in particular having a hexagonal cross-section, in a form-fitting manner. - The tear-off screw according to claim 3 to 4,
characterized in that the cross-section of the inner recess (8) decreases stepwise from the head section (2) to the foremost thread section (4d), preferably in that initial region of each thread section which is adjacent to the predetermined breaking point, or optionally remains essentially constant along the inner recess. - The tear-off screw according to any of claims 1 to 5,
characterized in that the cross-section of the outer border of the predetermined breaking points (10, 11) remains constant or increases from the head section (2) to the foremost thread section (4d). - The tear-off screw according to any of claims 1 to 6,
characterized in that the predetermined breaking points (10, 11) are arranged in tapering connecting sections (5, 6), at the smallest external diameter thereof. - The tear-off screw according to claim 7,
characterized in that all connecting sections (5, 6) have essentially equal smallest external diameters. - The tear-off screw according to any of claims 1 to 8,
characterized in that the tear-off screw is composed at least partly of metal, in particular electrically conducting metal, for example brass, and/or of plastic.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT94111058T ATE159085T1 (en) | 1994-07-15 | 1994-07-15 | TEAR-OFF SCREW |
| EP94111058A EP0692643B2 (en) | 1994-07-15 | 1994-07-15 | Shearable screw |
| DE59404282T DE59404282D1 (en) | 1994-07-15 | 1994-07-15 | Tear-off screw |
| ES94111058T ES2084567T1 (en) | 1994-07-15 | 1994-07-15 | REMOVABLE SCREW. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP94111058A EP0692643B2 (en) | 1994-07-15 | 1994-07-15 | Shearable screw |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0692643A1 EP0692643A1 (en) | 1996-01-17 |
| EP0692643B1 EP0692643B1 (en) | 1997-10-08 |
| EP0692643B2 true EP0692643B2 (en) | 2005-03-30 |
Family
ID=8216121
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94111058A Expired - Lifetime EP0692643B2 (en) | 1994-07-15 | 1994-07-15 | Shearable screw |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0692643B2 (en) |
| AT (1) | ATE159085T1 (en) |
| DE (1) | DE59404282D1 (en) |
| ES (1) | ES2084567T1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3974666A1 (en) | 2020-09-25 | 2022-03-30 | Nexans | Shear bolt |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2157105T3 (en) | 1998-08-18 | 2001-08-01 | Petri Gerhard Gmbh & Co Kg | SCREW HEAD SCREW. |
| DE19960198A1 (en) * | 1999-12-14 | 2001-06-28 | Pfisterer Kontaktsyst Gmbh | Locking screw device with distancing element and screw connecting lock for fixing an object includes a setscrew with a tool holder, predetermined breaking points and a distancing element in the tool holder. |
| EP1376764B1 (en) | 2002-06-27 | 2010-08-18 | Arcus Elektrotechnik Alois Schiffmann GmbH | Multi-secable screw |
| DE10234460B3 (en) * | 2002-06-27 | 2004-03-18 | Arcus Elektrotechnik Alois Schiffmann Gmbh | Multiple shear screw |
| DE10312147A1 (en) * | 2003-03-17 | 2004-10-07 | Pfisterer Kontaktsysteme Gmbh & Co. Kg | Fasteners, in particular a tear-off screw, and associated screw connection clamp |
| DE102004039811A1 (en) | 2004-08-11 | 2006-02-23 | Pfisterer Kontaktsysteme Gmbh & Co. Kg | Fastening means, in particular tear-off screw, associated system and method for screwing in the fastening means |
| DE102005007384A1 (en) | 2005-02-18 | 2006-08-31 | Zf Friedrichshafen Ag | Arrangement for the axial support of two rotating components |
| KR101366943B1 (en) | 2006-05-05 | 2014-02-24 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Tubular terminal for a cable |
| DE102006048177A1 (en) * | 2006-10-10 | 2008-04-24 | Pfisterer Kontaktsysteme Gmbh & Co. Kg | Fastening means, in particular tear-off screw, with separable clamping section |
| ES2394511T3 (en) * | 2006-12-12 | 2013-02-01 | Nexans | Fixing device suitable for shearing with force transmission element |
| ES2341135T3 (en) * | 2007-12-11 | 2010-06-15 | Nexans | SCREW WITH SHEAR. |
| DE102008039431B4 (en) | 2008-08-25 | 2013-08-29 | Cellpack Gmbh | Tear-off screw for connecting elements of electrical conductors |
| DE102009009793A1 (en) * | 2009-02-20 | 2010-08-26 | Südkabel GmbH | Cable connector for tearing head screw, has pipe coupling, in which internal space of cable end is inserted and screw, by which cable end is clamped in pipe coupling |
| DE102009030662A1 (en) * | 2009-06-25 | 2010-12-30 | Hager Electro Gmbh & Co. Kg | Screw terminal connection device, in particular for connecting a power cable to a power meter installation |
| PL2608338T3 (en) | 2011-12-21 | 2014-04-30 | 3M Innovative Properties Co | Terminal connection device for a power cable |
| CA2916569A1 (en) | 2013-06-26 | 2014-12-31 | 3M Innovative Properties Company | Power cable terminal connection device |
| US9689416B2 (en) * | 2014-12-04 | 2017-06-27 | Classic Connectors, Inc. | Torque limiting set screw |
| DE102015102222A1 (en) | 2015-02-17 | 2016-08-18 | Cellpack Gmbh | Fasteners for fasteners for electrical conductors, such as screw terminals or screw connectors |
| DE102015102224B4 (en) | 2015-02-17 | 2021-04-29 | Bbc Cellpack Gmbh | Fastening means for connecting elements for electrical conductors and connecting element with such a fastening means |
| DE102015102223A1 (en) | 2015-02-17 | 2016-08-18 | Cellpack Gmbh | Fasteners for electrical conductor connectors and connector with such fastener |
| DE102015116301A1 (en) * | 2015-09-25 | 2017-03-30 | Voss Automotive Gmbh | "Screw" |
| WO2018102118A1 (en) | 2016-11-30 | 2018-06-07 | 3M Innovative Properties Company | Shear bolt |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0514924A1 (en) † | 1991-05-23 | 1992-11-25 | ARCUS ELEKROTECHNIK Alois Schiffmann GmbH | Contact screw |
| WO1995025229A1 (en) † | 1994-03-15 | 1995-09-21 | Sicame Electrical Developments Ltd | Improvements relating to clamping screws |
Family Cites Families (3)
| 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 (en) * | 1990-08-08 | 1991-01-03 | Gerhard Petri Gmbh + Co. Kg, 8670 Hof | Shear head screw |
-
1994
- 1994-07-15 EP EP94111058A patent/EP0692643B2/en not_active Expired - Lifetime
- 1994-07-15 AT AT94111058T patent/ATE159085T1/en not_active IP Right Cessation
- 1994-07-15 ES ES94111058T patent/ES2084567T1/en active Pending
- 1994-07-15 DE DE59404282T patent/DE59404282D1/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0514924A1 (en) † | 1991-05-23 | 1992-11-25 | ARCUS ELEKROTECHNIK Alois Schiffmann GmbH | Contact screw |
| WO1995025229A1 (en) † | 1994-03-15 | 1995-09-21 | Sicame Electrical Developments Ltd | Improvements relating to clamping screws |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3974666A1 (en) | 2020-09-25 | 2022-03-30 | Nexans | Shear bolt |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0692643A1 (en) | 1996-01-17 |
| ATE159085T1 (en) | 1997-10-15 |
| ES2084567T1 (en) | 1996-05-16 |
| EP0692643B1 (en) | 1997-10-08 |
| DE59404282D1 (en) | 1997-11-13 |
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