EP1376764A2 - Mehrfach-Abscherschraube - Google Patents
Mehrfach-Abscherschraube Download PDFInfo
- Publication number
- EP1376764A2 EP1376764A2 EP03014617A EP03014617A EP1376764A2 EP 1376764 A2 EP1376764 A2 EP 1376764A2 EP 03014617 A EP03014617 A EP 03014617A EP 03014617 A EP03014617 A EP 03014617A EP 1376764 A2 EP1376764 A2 EP 1376764A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- screw
- pin
- screw according
- disks
- recesses
- 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.)
- Granted
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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 multiple shear bolt, with a cylindrical body, who has a thread on the outside and a head on the an end of the body that has engagement surfaces for a drive tool, wherein the screw has several axially separated predetermined breaking points, which are a row of shear planes.
- shear bolts are known for example from EP-A-0 692 643 and are used for example in screw connectors to electrical cable conductors to join. In this context, it depends on the leader ends contact with a predetermined contact pressure to ensure a perfect to ensure mechanical and electrical connection.
- shear bolts are well suited because they relate to specified ones Have the shear torques set. The head is torn off then that the screw is tightened to the specified torque has been generated and thus the desired contact pressure. At the same time reliably avoided that such a screw is tightened too much and Possibly crushed or damaged the conductor end of a cable conductor.
- the conventional shear bolt according to EP-A-0 692 643 is designed that the shaft has a series of thread areas, which by cuts are separated from each other, which form predetermined breaking points in order to Specify shear planes.
- the invention is therefore based on the object of a shear screw at the outset specified type, which has a robust construction and a reliable Function guaranteed in practice.
- the solution according to the invention is a multiple shear screw type mentioned so that the body with a central pin non-circular cross-section, into which axially spaced radial recesses are incorporated are, and has one or more washers, which are attached to the pin and that the body has a continuous thread on its outside.
- the punctures can advantageously be used to produce the predetermined breaking points incorporated regardless of the thread on the outside of the body his. So there are no additional "edges" on any thread 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 recesses and the corresponding plugged ones Slices can be chosen depending on the realities of practice to any number of shear planes at the predetermined breaking points to specify which are formed by the punctures.
- the punctures are designed as circumferential ring grooves. In this way it becomes even Shear of the screw favors when tightened and in operation a predetermined torque is exceeded.
- the punctures in the longitudinal section of the screw taper in a radial direction.
- the respective shear plane can thus be specified exactly at which the screw is in operation to tear off.
- the punctures penetrate to different depths in the material of the pin in the radial direction. In this way it is achieved that the screw at the respective punctures then breaks off when the torque specified there at the respective point is exceeded. In particular, it can be specified at which point the screw easiest to tear off, and which predetermined breaking point is the last to tear off.
- the punctures in the invention Screw have a flat bottom, which is substantially perpendicular to Central axis of the screw extends. In this way it is achieved that the screw forms the smoothest possible fracture surface when the screw is exceeded of a predetermined torque at the shear plane.
- the punctures are designed such that the Screw on the shear planes formed by them at torques that gradually increase from the front end of the screw towards her head. If such a screw is used in operation and against a workpiece, for example tightened a conductor in a screw connector, this is achieved that the screw always breaks off at the appropriate point.
- the tear-off torques Gradually remove from the front end of the screw towards her head. This depends on the circumstances.
- the washers have an axial height that is equal to the axial distance between two adjacent radial recesses. This ensures that the screw after the tear-off forms a particularly smooth fracture plane.
- the disks have a smooth top, which can be flat or convex on one side or concave on one side. If the Top is concave on one side, so you can achieve that the predetermined breaking point slightly in the area of the pin opposite the outer edge of the disc is sunk.
- the Screw at its front end has an annular plate that one Carrier for the attached discs forms.
- the plate forms on the one hand a stop for the respective discs and on the other hand forms the front Contact area of the screw.
- the plate has the same diameter as that Has discs. Then the plate and the attached slices form a homogeneous one Unity, namely a cylindrical body that on the outside of the has continuous thread.
- the plate with a crowned screw tip or another contact geometry is formed.
- Such screws are for electrical screw connector well suited.
- the screw tip can, for example the shape of a spherical cap, a tapered cone or a flat one Have the end face of a contact screw.
- the washers have an internal recess complementary to the tenon and with a press fit are placed directly on top of each other on the pin. This makes it a compact Design of the screw reached.
- the pin has an outer edge at its upper end.
- it is an external hexagon, so that conventional tools can be used.
- the pin on has an axially machined, central inner edge at its upper end, in particular a hexagon socket, so that conventional tools for actuation the screw can be used.
- Such an inner edge can additionally or alternatively to the outer edge, to give the fitter the choice of Tool.
- a pin with a radially projecting plate which forms a carrier for the discs.
- the plate can be with specify the desired shape and dimension and at the same time form a support for the slices to be put on.
- the disks with positive engagement on the pin and before incorporation of the thread can be fixed on it. This makes it particularly compact and homogeneous arrangement of the screw achieved.
- a pin 12 can be seen as the base body for a multiple shear bolt according to the invention.
- the pin 12 has expediently a symmetrical structure with respect to the central axis 38.
- a circular plate 16 which its outside has a crowned screw tip 18, which, for example, as Spherical cap can be formed and the contact surface of a contact screw can form.
- Fig. 3 shows a schematic representation of the entire screw 10 obliquely above, circular disks 26 being attached to the pin 12.
- disks 26 are shown schematically. You can see that these disks 26 each have an inner recess 28 which is non-circular Has cross section and is adapted to the non-circular cross section of the pin 12.
- the height of the disks 26 is expediently such that it is the distance between two axially spaced recesses 22. Conveniently, are these dimensions, i.e. the axial distances between the punctures and so that the height of the disks is given uniformly, so that such disks 26th can be attached to the pin 12 in any order.
- the pin 12 has the shape of a uniform one External hexagon, which the disks 26 with a corresponding complementary hexagonal inner recess 28 receives, these with a press fit be plugged onto the pin 12. But it can also have any other contour non-circular cross-section can be used for the pin 12 or the washers 26, which are each complementary to each other to form a compact design to ensure the screw 10.
- the top of the top disk 26 is in front of the last puncture 22 assigned to the head 20 of the shear screw 10, as can be seen in FIGS. 3 and 6 can.
- the pin 12 forms with the attached Disks 26 a cylindrical body 32, on the outside of a continuous Thread 34 is incorporated.
- the head 20 is designed as an outer edge 36, in particular as an external hexagon, its outer contour having the same shape as the have underlying pin regions 30. Then the head 20 no longer needs to be processed separately.
- the head 20 can also have a smaller cross section.
- a central inner edge in the upper end of the pin 12 incorporated axially symmetrically, in particular a hexagon socket, if this is desired.
- the punctures 22 shown schematically in FIGS. 1 and 2 can be in some areas be provided, but are expediently designed as circumferential annular grooves and taper in a wedge shape in the longitudinal section of the screw in the radial direction towards the inside in order to precisely specify the location of the predetermined breaking points.
- the predetermined breaking point are the recesses 22 in the radial direction at different depths in the Material of the pin 12 incorporated.
- the punctures 22 have expediently a flat floor 24, substantially perpendicular to the central axis 38 of the Screw 10 to ensure a smooth fracture surface.
- the dimensions of the recesses 22 are expediently designed such that that the shear torques from the plate 16 to the head 20 of the pin 12 gradually increase. This means that the lowest predetermined breaking point may break first or the predetermined breaking point adjacent to the head 20 when the screw 10 tightened against a workpiece and a torque is exceeded.
- the arrangement can also be such that the breakaway torques from the screw tip 18 at the front end of the Gradually remove screw 10 towards her head 20. Then it will be appropriate Attack surfaces in the form of an inner edge provided in the screw 10, to gradually tear off the corresponding screw components.
- the disks 26 have a smooth, flat surface in the illustrated embodiment Top. However, this can also be convex on one side or concave on one side his. In the latter case it is achieved that the fracture surface on the pin 12 opposite the outer edge of the disc 26 is slightly sunk with the thread 34.
- the upper side of the respective disk 26 is expediently on the outer edge chamfered. In this way, after tearing off such There are no unnecessarily sharp edges on the top of the shear screw could damage a sleeve, which could then be Screw connector is attached around.
- the predetermined breaking points are those of the punctures 22 are formed, protected inside the finished screw 10 housed.
- the Screw 10 itself has a continuous external thread 34, as indicated in Fig. 6 is.
- a pin which has a non-circular cross-section, for example as an axially symmetrical external hexagon, which has a radially projecting stop at its lower end, the to serve as a support for the disks 26.
- radial recesses 22 are incorporated, with a predetermined number and penetration depth at the desired axial distances.
- disks 26 with a complementary inner recess 28 become the outer one Configuration of the pin 12 plugged onto the pin 12 so that the cylindrical Body 32 according to FIG. 3 results.
- the aforementioned stop at the bottom The end of the pin 12 is advantageously designed as a plate 16, which is the same Diameter as the discs 26 has.
- Common metals or metal alloys can be used as material for the screw 10 are used, which are selected depending on the intended use. In special applications, such a screw can also be used entirely or partially made partially of plastic or some other insulating material, for example Ceramics.
Landscapes
- Bolts, Nuts, And Washers (AREA)
- Milling Processes (AREA)
- Disintegrating Or Milling (AREA)
Abstract
Description
- Bereitstellen eines Zapfens mit unrundem Querschnitt,
- Einarbeiten von axial beabstandeten radialen Einstichen in den Zapfen in vorgegebenen Abständen,
- Aufstecken einer Anzahl von Scheiben auf den Zapfen zur Bildung eines zylindrischen Körpers, und
- Einarbeiten eines durchgehenden Gewindes an der Außenseite des zylindrischen Körpers.
- Fig. 1
- eine Seitenansicht eines Zapfens für eine erfindungsgemäße Schraube;
- Fig. 2
- eine perspektivische Seitenansicht, schräg von oben, auf den Zapfen gemäß Fig. 1;
- Fig. 3
- eine schematische perspektivische Darstellung der erfindungsgemäßen Schraube mit einem Zapfen und aufgesteckten Scheiben;
- Fig. 4
- eine schematische Draufsicht auf eine Scheibe für die erfindungsgemäße Schraube;
- Fig. 5
- eine perspektivische Seitenansicht einer Scheibe gemäß Fig. 4; und in
- Fig. 6
- eine schematische Seitenansicht einer erfindungsgemäßen Schraube.
- 10
- Mehrfach-Abscherschraube
- 12
- Zapfen
- 14
- vorderes Ende
- 16
- Teller
- 18
- Schraubenkuppe
- 20
- Kopf
- 22
- Einstich
- 24
- Boden
- 26
- Scheibe
- 28
- Innenausnehmung
- 30
- Zapfenbereiche
- 32
- Körper
- 34
- Gewinde
- 36
- Außenkant
- 38
- Mittelachse
Claims (19)
- Mehrfach-Abscherschraube, mit einem zylindrischen Körper (32), der an seiner Außenseite ein Gewinde (34) besitzt, und mit einem Kopf (20) an dem einen Ende des Körpers (32), der Angriffsflächen (36) für ein Antriebswerkzeug aufweist, wobei die Schraube mehrere axial getrennte Sollbruchstellen (22) aufweist, die eine Reihe von Scherebenen bilden,
dadurch gekennzeichnet, daß der Körper (32) einen zentralen Zapfen (12) mit unrundem Querschnitt, in den axial beabstandete radiale Einstiche (22) eingearbeitet sind, sowie eine oder mehrere Scheiben (26) aufweist, die auf den Zapfen (12) aufgesteckt sind,
und daß der Körper (32) an seiner Außenseite ein durchgehendes Gewinde (34) aufweist. - Schraube nach Anspruch 1,
dadurch gekennzeichnet, daß die Einstiche (22) als umlaufende Ringnuten ausgebildet sind. - Schraube nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß die Einstiche (22) im Längsschnitt der Schraube sich in radialer Richtung keilförmig verjüngen. - Schraube nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß die Einstiche (22) in radialer Richtung unterschiedlich tief in das Material des Zapfens (12) eindringen. - Schraube nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß die Einstiche (22) einen ebenen Boden (24) aufweisen, der sich im wesentlichen senkrecht zur Mittelachse (38) der Schraube erstreckt. - Schraube nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet, daß die Einstiche (22) derart ausgebildet sind, daß die Schraube an den von ihnen gebildeten Scherebenen bei Drehmomenten abreißt, die von dem vorderen Ende (14) der Schraube zu ihrem Kopf (20) hin schrittweise zunehmen oder abnehmen. - Schraube nach einem der Ansprüche 1 bis 6,
dadurch gekennzeichnet, daß die Scheiben (26) eine axiale Höhe haben, die gleich dem axialen Abstand zwischen jeweils zwei benachbarten radialen Einstichen (22) ist. - Schraube nach einem der Ansprüche 1 bis 7,
dadurch gekennzeichnet, daß die Scheiben (26) eine glatte Oberseite haben, die plan oder einseitig konvex oder einseitig konkav ausgebildet ist. - Schraube nach einem der Ansprüche 1 bis 8,
dadurch gekennzeichnet, daß die Oberseite der jeweiligen Scheibe (26) am Außenrand angefast ist. - Schraube nach einem der Ansprüche 1 bis 9,
dadurch gekennzeichnet, daß die Schraube an ihrem vorderen Ende einen ringförmigen Teller (16) aufweist, der einen Träger für die aufgesteckten Scheiben (26) bildet. - Schraube nach Anspruch 10,
dadurch gekennzeichnet, daß der Teller (16) den gleichen Durchmesser wie die Scheiben (26) aufweist. - Schraube nach Anspruch 10 oder 11,
dadurch gekennzeichnet, daß der Teller (16) mit einer balligen Schraubenkuppe (18) ausgebildet ist. - Schraube nach einem der Ansprüche 1 bis 12,
dadurch gekennzeichnet, daß die Scheiben (26) eine zum Zapfen (12) komplementäre Innenausnehmung (28) haben und mit Preßsitz direkt aufeinander auf den Zapfen (12) aufgesteckt sind. - Schraube nach einem der Ansprüche 1 bis 13,
dadurch gekennzeichnet, daß das obere Ende des Zapfens (12) den Kopf (20) der Schraube für das Antriebswerkzeug bildet. - Schraube nach einem der Ansprüche 1 bis 14,
dadurch gekennzeichnet, daß der Zapfen (12) an seinem oberen Ende einen Außenkant (36) als Kopf aufweist. - Schraube nach einem der Ansprüche 1 bis 15,
dadurch gekennzeichnet, daß der Zapfen (12) an seinem oberen Ende einen axial eingearbeiteten zentralen Innenkant aufweist. - Verfahren zum Herstellen einer Mehrfach-Abscherschraube,
gekennzeichnet durch folgende Schritte:Bereitstellen eines Zapfens (12) mit unrundem Querschnitt,Einarbeiten von axial beabstandeten radialen Einstichen (22) in den Zapfen (12) in vorgegebenen Abständen,Aufstecken einer Anzahl von Scheiben (26) auf den Zapfen (12) zur Bildung eines zylindrischen Körpers (32), undEinarbeiten eines durchgehenden Gewindes (34) an der Außenseite des zylindrischen Körpers (32). - Verfahren nach Anspruch 17,
dadurch gekennzeichnet, daß ein Zapfen (12) mit einem radial vorstehenden Teller (16) verwendet wird, der einen Träger für die Scheiben (26) bildet. - Verfahren nach Anspruch 17 oder 18,
dadurch gekennzeichnet, daß die Scheiben (26) mit formschlüssigem Eingriff auf den Zapfen (12) aufgesteckt und vor dem Einarbeiten des Gewindes (34) darauf fixiert werden.
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 true EP1376764A2 (de) | 2004-01-02 |
EP1376764A3 EP1376764A3 (de) | 2005-09-21 |
EP1376764B1 EP1376764B1 (de) | 2010-08-18 |
Family
ID=29718105
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20030014617 Expired - Lifetime EP1376764B1 (de) | 2002-06-27 | 2003-06-26 | Mehrfach-Abscherschraube |
Country Status (1)
Country | Link |
---|---|
EP (1) | EP1376764B1 (de) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1626187A1 (de) | 2004-08-11 | 2006-02-15 | Pfisterer Kontaktsysteme GmbH & Co. KG | Befestigungsmittel, insbesondere Abreissschraube, zugehöriges System und Verfahren zum Eindrehen des Befestigungsmittels |
FR2907859A1 (fr) * | 2006-10-30 | 2008-05-02 | Tyco Electronics Simel Soc Par | Ensemble a vis a rupture programmee |
EP1953397A1 (de) | 2007-01-26 | 2008-08-06 | Arcus Elektrotechnik Alois Schiffmann GmbH | Abscherschraube und Verfahren zu ihrer Herstellung |
EP2159881A1 (de) * | 2008-08-25 | 2010-03-03 | 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 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0692643A1 (de) | 1994-07-15 | 1996-01-17 | Limanin Establishment | Abreissschraube |
-
2003
- 2003-06-26 EP EP20030014617 patent/EP1376764B1/de not_active Expired - Lifetime
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0692643A1 (de) | 1994-07-15 | 1996-01-17 | Limanin Establishment | Abreissschraube |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1626187A1 (de) | 2004-08-11 | 2006-02-15 | Pfisterer Kontaktsysteme GmbH & Co. KG | Befestigungsmittel, insbesondere Abreissschraube, zugehöriges System und Verfahren zum Eindrehen des Befestigungsmittels |
DE102004039811A1 (de) * | 2004-08-11 | 2006-02-23 | Pfisterer Kontaktsysteme Gmbh & Co. Kg | Befestigungsmittel, insbesondere Abreißschraube, zugehöriges System und Verfahren zum Eindrehen des Befestigungsmittels |
FR2907859A1 (fr) * | 2006-10-30 | 2008-05-02 | Tyco Electronics Simel Soc Par | Ensemble a vis a rupture programmee |
EP1918595A1 (de) * | 2006-10-30 | 2008-05-07 | Tyco Electronics-Simel | Gesteuerte Scherbolzenanordnung |
US7717658B2 (en) | 2006-10-30 | 2010-05-18 | Tyco Electronics Simel Sas | Bolt assembly |
EP1953397A1 (de) | 2007-01-26 | 2008-08-06 | Arcus Elektrotechnik Alois Schiffmann GmbH | Abscherschraube und Verfahren zu ihrer Herstellung |
EP2159881A1 (de) * | 2008-08-25 | 2010-03-03 | 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 |
Also Published As
Publication number | Publication date |
---|---|
EP1376764B1 (de) | 2010-08-18 |
EP1376764A3 (de) | 2005-09-21 |
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