EP0336136B2 - Screw driver bit - Google Patents

Screw driver bit Download PDF

Info

Publication number
EP0336136B2
EP0336136B2 EP89104230A EP89104230A EP0336136B2 EP 0336136 B2 EP0336136 B2 EP 0336136B2 EP 89104230 A EP89104230 A EP 89104230A EP 89104230 A EP89104230 A EP 89104230A EP 0336136 B2 EP0336136 B2 EP 0336136B2
Authority
EP
European Patent Office
Prior art keywords
section
intermediate section
length
screwdriver
screwdriver bit
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
EP89104230A
Other languages
German (de)
French (fr)
Other versions
EP0336136A1 (en
EP0336136B1 (en
Inventor
Karl Lieser
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.)
Wera Werk Hermann Werner GmbH and Co KG
Original Assignee
Wera Werk Hermann Werner GmbH and Co KG
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=6349389&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0336136(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Wera Werk Hermann Werner GmbH and Co KG filed Critical Wera Werk Hermann Werner GmbH and Co KG
Priority to AT89104230T priority Critical patent/ATE75982T1/en
Publication of EP0336136A1 publication Critical patent/EP0336136A1/en
Application granted granted Critical
Publication of EP0336136B1 publication Critical patent/EP0336136B1/en
Publication of EP0336136B2 publication Critical patent/EP0336136B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • B25B23/142—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers specially adapted for hand operated wrenches or screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B15/00—Screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B15/00—Screwdrivers
    • B25B15/001—Screwdrivers characterised by material or shape of the tool bit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers

Definitions

  • the invention relates to a screwdriver bit according to the preamble of claim 1 (see 2.B EP-A-0221279)
  • a twistable zone serves as a predetermined breaking point.
  • the intermediate section breaks when a target torque is reached.
  • the object of the invention is based on the object of a generic screwdriver insert to design in a technically simple manner so that acting on the screwdriver bit Torque peaks do not cause deformation of the screwdriver tip section that Lifespan increased and working with machine screwdrivers is considerably easier.
  • a generic screwdriver insert is of increased height Use value specified. If higher torque peaks are effective on the screwdriver insert, for example caused by abruptly occurring drive force peaks or by different Condition of the material receiving the screw, the intermediate section between Drive end section and output end section an elastic twist / torsion.
  • the intermediate section provides an elastic flexible element with corresponding resilience after overcoming the peak load. It endures larger Moments, even with repeated loads. He absorbs deformation work and partially stores it in the form of potential energy and releases it when it is relieved back again.
  • the intermediate section acts as a damper, so that torque peaks are not directly proportional to Screwdriver tip section take effect. This does in a particularly long service life of the screwdriver insert and the screw noticeable.
  • the intermediate section twists.
  • the screwdriver tip can be the intermediate section in its length and its cross-section are designed so that any energy peaks are always absorbed under load will.
  • the ratio at normal steel as material for DIN-standardized use
  • the ratio corresponds in particular the length of the intermediate section about 3 times hers Diameter.
  • a further possibility to solve the task according to the invention is one Provide axial cavity in the intermediate section by the Polygonal section runs out. The axial cavity can be changed / adjusted of the torsional resistance moment of the intermediate section can be chosen differently in diameter and also of different lengths.
  • the intermediate section is preferably one opposite the polygonal section stepped circular section. Screwdriver bits to transmit low torques a correspondingly smaller intermediate section.
  • the number 1 denotes a screwdriver bit in DIN standard (size 2). With this one Phillips screw 2 illustrated in Fig. 1 are rotated. The latter consists of one a thread 3 having screw shaft 4 and a countersunk head 5, which contains the cross recess 6.
  • the screwdriver tip 7 is designed in accordance with the cross recess 6 and the associated DIN standard. This has four driving ribs 8 arranged in the same circumferential distribution and thus forms the output end region 9 (screwdriver tip section). This is followed by a circular cross section Intermediate section 10, which the aforementioned screwdriver tip section 9 and the drive end portion 11 connects with each other.
  • the force-transmitting depth of penetration into the screw is generally sufficient only about a maximum of half of section Ab and is in any case DIN-standardized for the test torques.
  • At the conical step 12 from the circular cross section of the intermediate section 10 to the polygonal section 11 rests on the elastic ring 16, arranged in an inner groove 15 of the machine chuck 13, and pulls thereby inserting the screwdriver 1 into the machine chuck 13 until the thread surface 17 at the bottom of the Machine feed 13 is present.
  • This bracket can have considerable tolerances because of the pulling moment compensate for what in turn the production of insert 1 overall by way of (never so absolutely accurate cold deformation to be carried out.
  • the total length of the screwdriver bit 1 shown is 25 in accordance with the DIN standard mm.
  • the one minus the polygonal section is about 17 mm.
  • the intermediate section 10 (including the Section S) and output end section thus take up approximately 70% of the total length of the insert 1.
  • the length Zone S is approximately half the length of the section Ab and approximately just the length of the in Screw submersible output end section; the remaining length of the intermediate section 10 from the roots 8 '' up to level 16 a little more than twice the length of this output end section Ab or somewhat more than four times the length of zone S.
  • the length of the intermediate section 10 plus zone S is therefore approx. 11 mm, the one plus the output end section 9, ie 17 mm, the one up to the level of the normal screw insertion depth approx.
  • the screwdriver bit 1 is attached in such a way that his screwdriver tip 7 positively engages in the Phillips 6 of the Phillips screw.
  • this leads to a resistance that remains in the elastic range Torsion of the intermediate section 10, primarily on its area T. Its torsional modulus is also less than the section modulus Screwdriver tip section 9. Large energy spikes are accordingly eliminated so that the screwdriver tip 7 Protected against excessive loads remains associated with an increased service life.
  • the second embodiment of the screwdriver bit 18 illustrated in FIG. 3 largely corresponds the design described above.
  • the same components are therefore provided with the same reference numbers.
  • an axial cavity 19 now extends from the polygonal section 11 which extends over the intermediate section 10 and ends before the tip section 9 or the zone S.
  • a change or adaptation option for the torsional modulus is obtained of the intermediate section 10, so that torsion of the same may occur even at very low loads.
  • a variation can be obtained in such an embodiment in that the diameter is different large axial cavities can be selected.
  • the torsional modulus of the intermediate section can be determined by its shape and cross-sectional size 6 determine. It is therefore an optimal adaptation to a wide variety of circumstances possible.

Abstract

A screwdriver bit (1) comprises a terminal drive end region (11) which can be inserted in a chuck (13) of a machine, an intermediate section (10), and a drive region (screwdriver tip section) (9) preferably for recessed-head screws. To facilitate use, the intermediate section (10) forms a T region such that an elastic return force extending over a large reverse angle of rotation is exerted until the torque which results in plastic deformation/rupture is obtained.

Description

Die Erfindung betrifft einen Schraubendrehereinsatz gemäß Gattungsbegriff des Patentanspruchs 1 (siehe 2.B EP-A-0221279)The invention relates to a screwdriver bit according to the preamble of claim 1 (see 2.B EP-A-0221279)

Bei bekannten Schraubendrehereinsätzen (DE-OS 22 31 949) dient eine tordierbare Zone als Sollbruchstelle. Der Zwischenabschnitt bricht bei einem erreichten Soll-Drehmoment. Mit diesen Schraubendrehereinsätzen sollen bei Verwendung in Maschinenschrauber-Futtern keine zu großen Drehmoment-Spitzen übertragbar sein. Der Einsatz ist ein Einwegartikel zum Festziehen von Schrauben. Er ist nur begrenzt einsetzbar.In known screwdriver bits (DE-OS 22 31 949), a twistable zone serves as a predetermined breaking point. The intermediate section breaks when a target torque is reached. With these screwdriver bits If used in machine screwdriver chucks, torque peaks should not be too large be transferable. The insert is a single-use item for tightening screws. It can only be used to a limited extent.

Dem Gegenstand der Erfindung liegt die Aufgabe zugrunde, einen gattungsgemäßen Schraubendrehereinsatz in herstellungstechnisch einfacher Weise so auszugestalten, daß auf den Schraubendrehereinsatz wirkende Drehmomentspitzen zu keiner Verformung des Schraubendreherspitzen-Abschnittes führen, die Lebensdauer erhöht und das Arbeiten mit Maschinenschraubern erheblich erleichtert ist.The object of the invention is based on the object of a generic screwdriver insert to design in a technically simple manner so that acting on the screwdriver bit Torque peaks do not cause deformation of the screwdriver tip section that Lifespan increased and working with machine screwdrivers is considerably easier.

Gelöst wird diese Aufgabe bei einem gattungsgemäßen Schraubendrehereinsatz durch das Kennzeichen des Patentanspruchs 1. Die Unteransprüche stellen vorteilhafte Weiterbildungen dar.This problem is solved in the case of a generic screwdriver insert by the indicator of claim 1. The subclaims represent advantageous developments.

Zufolge derartiger Ausgestaltung ist ein gattungsgemäßer Schraubendrehereinsatz von erhöhtem Gebrauchswert angegeben. Werden am Schraubendrehereinsatz höhere Drehmomentspitzen wirksam, beispielsweise hervorgerufen durch schlagartig einsetzende Antriebs-Kraftspitzen oder durch unterschiedliche Beschaffenheit des die Schraube aufnehmenden Materials, so erlaubt der Zwischenabschnitt zwischen Antriebsendabschnitt und Abtriebsendabschnitt eine elastische Verdrillung/Torsion. Der Zwischenabschnitt stellt ein elastisch nachgiebiges Element mit entsprechendem Rückstellvermögen nach Überwindung der Belastungsspitze dar. Er erträgt größere Momente, und zwar auch bei wiederholter Belastung. Er nimmt dabei Verformungsarbeit auf und speichert sie teilweise in Form potentieller Energie und gibt diese bei Entlastung wieder zurück. Der Zwischenabschnitt wirkt als Dämpfer, so daß Drehmomentspitzen nicht direkt proportional am Schraubendreherspitzen-Abschnitt wirksam werden. Dies macht sich in einer besonders hohen Lebensdauer des Schraubendrehereinsatzes und der Schraube bemerkbar. Zusätzlich sind die Auswurfkräfte reduziert. Bevor der Schraubendreherspitzen-Abschnitt sich verformt oder seinen Einstecksitz zur Schraube verliert, tordiert der Zwischenabschnitt. Je nach Beschaffenheit der Schraubendreherspitze kann der Zwischenabschnitt in seiner Länge und in seinem Querschnitt so gestaltet werden, daß stets etwaige Energiespitzen bei Belastung aufgefangen werden. Erfindungs gemäß liegt das Verhältnis (bei normalem Stahl als Material für den DIN-genormten Einsatz) von Durchmesser zu Länge des Zwischenabschnitts im Bereich zwischen 0.5 und 0.2, insbesondere entspricht die Lange des Zwischenabschnitts etwa dem 3-fachen ihres Durchmessers. Eine weitergehende Möglichkeit, die Aufgabe erfindungs gemäß zu lösen besteht darin, eine Axialhöhlung im Zwischenabschnitt vorzusehen, die von dem Mehrkantabschnitt ausgeht. Die Axialhöhlung kann zur Änderung/Anpassung des Torsions-Widerstandsmoments des Zwischenabschnitts im Durchmesser unterschiedlich groß gewählt werden und auch unterschiedlich lang. Dies erlaubt es z.B., vom Äußeren her gleichgestaltete Schraubendrehereinsätze mit unterschiedlichen Zwischenabschnitten zu erzeugen, und zwar im Hinblick auf dessen Torsions-Widerstandsmoment. Der Zwischenabschnitt ist vorzugsweise ein gegenüber dem Mehrkantabschnitt stufenförmig abgesetzter Rundabschnitt. Schraubendrehereinsätze zur Übertragung geringer Drehmomente erfordern einen entsprechend durchmesserkleineren Zwischenabschnitt. Diese vielen vorgenannten Variationen gestatten eine optimale Anpassung an nach der Norm bestimmungsgemäßen Einschraubverhältnisse. Auch werden zufolge des Abschneidens der Energiespitzen die Schlitze bzw. Kreuzschlitze in den Schrauben geschont, so daß sie beispielsweise auch bei Bedarf gut herausdrehbar sind.As a result of such a configuration, a generic screwdriver insert is of increased height Use value specified. If higher torque peaks are effective on the screwdriver insert, for example caused by abruptly occurring drive force peaks or by different Condition of the material receiving the screw, the intermediate section between Drive end section and output end section an elastic twist / torsion. The intermediate section provides an elastic flexible element with corresponding resilience after overcoming the peak load. It endures larger Moments, even with repeated loads. He absorbs deformation work and partially stores it in the form of potential energy and releases it when it is relieved back again. The intermediate section acts as a damper, so that torque peaks are not directly proportional to Screwdriver tip section take effect. This does in a particularly long service life of the screwdriver insert and the screw noticeable. In addition, they are Ejection forces reduced. Before the screwdriver tip section deformed or its insert seat to the screw loses, the intermediate section twists. Depending on the nature the screwdriver tip can be the intermediate section in its length and its cross-section are designed so that any energy peaks are always absorbed under load will. According to the invention the ratio (at normal steel as material for DIN-standardized use) from diameter to length of the intermediate section in the area between 0.5 and 0.2, corresponds in particular the length of the intermediate section about 3 times hers Diameter. A further possibility to solve the task according to the invention is one Provide axial cavity in the intermediate section by the Polygonal section runs out. The axial cavity can be changed / adjusted of the torsional resistance moment of the intermediate section can be chosen differently in diameter and also of different lengths. This allows e.g. from Screwdriver bits with the same design on the outside to generate different intermediate sections, namely in terms of its torsional section modulus. The intermediate section is preferably one opposite the polygonal section stepped circular section. Screwdriver bits to transmit low torques a correspondingly smaller intermediate section. These many the aforementioned variations allow an optimal adaptation to the screwing-in conditions according to the standard. Also due to the cutting off of the energy peaks, the slots or cross slots spared in the screws so that they can be easily removed, for example, if necessary.

Nachstehend werden zwei Ausführungsbeispiele der Erfindung anhand der Figuren 1-3 erläutert. Es zeigt:

  • Fig. 1 teils in Ansicht, teils im Schnitt eine Kreuzschlitzschraube mit davor angeordnetem Schraubendrehereinsatz im Maßstab 1:1 in DIN-Norm und dahinter dargestellten Maschinenschrauber-Futter für den Einsatz,
  • Fig. 2 in stark vergrößerter Darstellung (5-fach) den in das Maschinenschrauber-Futter eingesteckten Schraubendrehereinsatz gemäß der ersten Ausführungsform und
  • Fig. 3 eine der Fig. 2 entsprechende Darstellung, betreffend die zweite Aiusführungsform, wobei der Schraubendrehereinsatz eine bis zum Zwischenabschnitt reichende Axialhöhlung besitzt.
    • Two exemplary embodiments of the invention are explained below with reference to FIGS. 1-3. It shows:
  • 1 partly in view, partly in section, a Phillips screw with a screwdriver bit in front of it in 1: 1 scale in DIN standard and machine screw chuck for use shown behind it,
  • Fig. 2 in a greatly enlarged representation (5 times) the screwdriver bit inserted into the machine screwdriver chuck according to the first embodiment and
  • Fig. 3 is a representation corresponding to Fig. 2, relating to the second form of the Aius guide, the screwdriver insert having an axial cavity extending to the intermediate section.

    • Mit der Ziffer 1 ist ein Schraubendrehereinsatz in DIN-Norm (Größe 2) bezeichnet. Mit diesem kann eine in Fig. 1 veranschaulichte Kreuzschlitzschraube 2 gedreht werden. Letztere setzt sich zusammen aus einem ein Gewinde 3 aufweisenden Schraubenschaft 4 und einem Senkkopf 5, welcher den Kreuzschlitz 6 enthält. Entsprechend dem Kreuzschlitz 6 und der zugehörigen DIN-Norm ist die Schraubendreherspitze 7 gestaltet. Diese besitzt vier in gleicher Umfangsverteilung ange ordnete Mitnahmerippen 8 und bildet damit den Abtriebsendbereich 9 (Schraubendreherspitzen-Abschnitt). An diesen schließt sich ein im Querschnitt kreisförmiger Zwischenabschnitt 10 an, welcher den vorgenannten Schraubendreherspitzen-Abschnitt 9 und den Antriebsendbereich 11 miteinander verbindet. Bezüglich desselben handelt es sich um einen Außensechskant-Abschnitt (ebenfalls entsprechend der zugehörigen DIN-Norm), welcher über eine konische Stufe 12 in den Zwischenabschnitt 10 übergeht. Beim Ausführungsbeispiel entspricht die Länge des Mehrkantabschnittes 11 etwa derjenigen des Zwischenabschnitts 10. Zur Herstellung des Schraubendrehereinsatzes wird Stahl mit federnden Eigenschaffen verwendet, beispielsweise Chromnickelstahl. Hergestellt ist er im Wege der Kaltverformung.The number 1 denotes a screwdriver bit in DIN standard (size 2). With this one Phillips screw 2 illustrated in Fig. 1 are rotated. The latter consists of one a thread 3 having screw shaft 4 and a countersunk head 5, which contains the cross recess 6. The screwdriver tip 7 is designed in accordance with the cross recess 6 and the associated DIN standard. This has four driving ribs 8 arranged in the same circumferential distribution and thus forms the output end region 9 (screwdriver tip section). This is followed by a circular cross section Intermediate section 10, which the aforementioned screwdriver tip section 9 and the drive end portion 11 connects with each other. Regarding the same, it is an external hex section (also in accordance with the associated DIN standard), which has a conical step 12 in the intermediate section 10 passes. In the exemplary embodiment, the length of the polygonal section 11 corresponds approximately that of the intermediate section 10. To produce the screwdriver bit, steel with resilient Own properties used, for example chrome nickel steel. It is made by cold forming.

    Letzeres erlaubt, anders als bei durch reines Abdrehen geformten Einsätzen, die Gestalt, daß die Mitnahmerippen 8 radial weiter nach außen ragen als der Querschnitt (Mantelfläche) des Zwischenabschnitts 10. Sie fallen von einer die äußersten Scheitel 8' verbindenden Umfangslinie wieder ab bis auf die Wurzelpunkte 8'', die auf der Mantelfläche des Zwischenabschnitts 10 liegen. Jenseits der die Scheitel 8' verbindenden Umfangslinie, erstreckt sich dadurch eine kurze Zone S, die durch die in den Kernquerschnitt des Zwischenabschnitts 10 reichenden Rinnen zwischen den Mitnahmerippen 8 zwar geschwächt, aber dennoch durch die radial ausladenden Rippenbereiche eine Stabilisierung erfahren haben. Diese vorstehenden Scheitel 8' bringen auch eine Anpassungsfreiheit bezüglich des Zwischenabschnitt-Durchmessers bei gleichen Einsteck-Verbindungsbedingungen zur Schraube. Die kraftübertragende Eindringtiefe in die Schraube reicht im allgemeinen nur etwa maximal über die Hälfte des Abschnitts Ab und ist auch jedenfalls für die Prüfdrehmomente DIN-genormt. An der konischen Stufe 12 vom kreisrunden Querschnitt des Zwischenabschnitts 10 zum Mehrkantabschnitt 11 liegt der elastische Ring 16, angeordnet in einer Innennut 15 des Maschinenfutters 13, an und zieht dadurch den Schraubendrehereinsatz 1 in das Maschinenfutter 13 hinein, bis die Strinfläche 17 am Boden des Maschinenfutters 13 anliegt. Diese Halterung kann wegen des einziehenden Moments erhebliche Toleranzen ausgleichen, was wiederum der Produktion des Einsatzes 1 insgesamt im Wege der (nie so absolut genau durchzuführenden) Kaltverformung entgegen kommt. The latter, unlike in the case of inserts formed by twisting off, allows the shape of the driving ribs 8 protrude radially further outwards than the cross section (lateral surface) of the intermediate section 10 fall again from a circumferential line connecting the outermost apex 8 'to the root points 8' ', which lie on the lateral surface of the intermediate section 10. Beyond that connecting the apex 8 ' Circumferential line, thereby extending a short zone S through which in the core cross section of the intermediate section 10 reaching channels between the driving ribs 8 weakened, but still by the radially protruding rib areas have undergone stabilization. Bring this protruding apex 8 ' also freedom of adjustment with regard to the intermediate section diameter with the same plug-in connection conditions to the screw. The force-transmitting depth of penetration into the screw is generally sufficient only about a maximum of half of section Ab and is in any case DIN-standardized for the test torques. At the conical step 12 from the circular cross section of the intermediate section 10 to the polygonal section 11 rests on the elastic ring 16, arranged in an inner groove 15 of the machine chuck 13, and pulls thereby inserting the screwdriver 1 into the machine chuck 13 until the thread surface 17 at the bottom of the Machine feed 13 is present. This bracket can have considerable tolerances because of the pulling moment compensate for what in turn the production of insert 1 overall by way of (never so absolutely accurate cold deformation to be carried out.

    Die Gesamt-Länge des dargestellten Schraubendrehereinsatzes 1 beträgt entsprechend der DIN-Norm 25 mm. Diejenige abzüglich des Mehrkantabschnittes etwa 17 mm. Der Zwischenabschnitt 10 (einschließlich des Abschnitts S) und Abtriebsendabschnitt nehmen also ca. 70% der Gesamtlänge des Einsatzes 1 ein. Die Länge der Zone S beträgt dabei ca. die Hälfte der Länge des Abschnitts Ab und etwa gerade die Länge des in die Schraube eintauchbaren Abtriebsendabschnittes; die restliche Länge des Zwischenabschnitts 10 von den Wurzeln 8'' bis zur Stufe 16 etwas mehr als das Zweifache der Länge dieses Abtriebsendabschnittes Ab bzw. etwas mehr als das Vierfache der Länge der Zone S. Die Länge des Zwischenabschnitts 10 plus Zone S beträgt also ca. 11 mm, diejenige plus Abtriebsendabschnitt 9 also 17 mm, diejenige bis zur Ebene der normalen Schraub-Einstecktiefe ca. 14 mm. Der Durchmesser des Mittelabschnitts beträgt etwa 4 mm. Das für die Torsionssteifigkeit des aus entsprechendem (üblicher Werkzeugstahl) Material bestehenden Zwischenabschnitts 10 mitverantwortliche Verhältnis von Durchmesser zu Länge istdemgemäß 0,3. Dieses Verhältnis schafft eine Torsionseigenschaft, die für die Kraftübertragung von einem Maschinenschrauber auf eine Schraube erhebliche Verbesserungen bringt dadurch, daß Belastungsspitzen abgefedert werden. Dem Erreichen des zur plastischen Verformung führenden Drehmomentes bzw. des Bruchdrehmomentes solcher Schraubendrehereinsätze geht dadurch eine erhebliche elastische Torsion voraus, die sich als Rückstellmoment über erhebliche Drehwinkel-Energiespitzen abflachend auswirkt und nachweisbar ist über die Größe des Rückdrehwinkels bei Erreichen des Verformungs-Drehmomentes bzw. des Bruch-Drehmomentes. Dieser Rückdrehwinkel liegt bei bekannten Einsätzen bei 2 Grad; bei den erfindsgemäß gestalteten Lösungen hingegen bei 3,5-8 Grad. Die Gebrauchstorsion bewirkt auch, daß eine Verformung der Schrauben-Eingriffsflächen der Rippen 8 unterbunden ist.The total length of the screwdriver bit 1 shown is 25 in accordance with the DIN standard mm. The one minus the polygonal section is about 17 mm. The intermediate section 10 (including the Section S) and output end section thus take up approximately 70% of the total length of the insert 1. The length Zone S is approximately half the length of the section Ab and approximately just the length of the in Screw submersible output end section; the remaining length of the intermediate section 10 from the roots 8 '' up to level 16 a little more than twice the length of this output end section Ab or somewhat more than four times the length of zone S. The length of the intermediate section 10 plus zone S is therefore approx. 11 mm, the one plus the output end section 9, ie 17 mm, the one up to the level of the normal screw insertion depth approx. 14 mm. The diameter of the central section is approximately 4 mm. That for the torsional rigidity of the intermediate section 10 consisting of appropriate (common tool steel) material co-responsible ratio of diameter to length is accordingly 0.3. This relationship creates a torsional property which is significant for the power transmission from a machine screwdriver to a screw Improvements result from the fact that load peaks are cushioned. Reaching the plastic Deformation of the leading torque or the breaking torque of such screwdriver bits This is preceded by a considerable elastic torsion, which can be considered as a restoring moment Rotation angle energy peaks has a flattening effect and can be demonstrated by the size of the reverse rotation angle Reaching the deformation torque or the breaking torque. This reverse rotation angle is included known operations at 2 degrees; in the solutions designed according to the invention, however, at 3.5-8 degrees. The Use torsion also causes deformation of the screw engaging surfaces of the ribs 8 to be prevented is.

    Jedes Verhältnis Durchmesser zu Länge des Zwischenabschnitts 10, welches kleiner als 0,5 und größer als 0,2 ist, bringt diese erhebliche Verbesserung der abgefederten Belastungsspitzen. Es ergeben sich auch optimale Verhältnisse in Relation zur Zone S, in welcher der Schraubendrehereinsatz abschert, wenn seine Materialbelastungsgrenze, insbesondere bei zu großer schlagartiger Torsion, überschritten wird.Any ratio of diameter to length of the intermediate section 10, which is less than 0.5 and greater than 0.2, this brings a significant improvement in the cushioned load peaks. It also results optimal conditions in relation to zone S, in which the screwdriver bit shears off when its Material load limit, especially in the event of excessive sudden torsion, is exceeded.

    Zum Eindrehen der Kreuzschlitzschraube 2 wird der Schraubendrehereinsatz 1 derart angesetzt, daß seine Schraubendreherspitze 7 formschlüssig in den Kreuzschlitz 6 der Kreuzschlitzschraube eingreift. Treten während des Einschraubens der Kreuzschlitzschraube größere Energiespitzen auf, hervorgerufen z.B. durch einen schnellen Gegen-Kraftanstieg an der Schraube, so führt dieses zu einer noch im elastischen Bereich bleibenden Torsion des Zwischenabschnittes 10, vornehmlich auf dessen Bereich T. Dessen Torsions-Widerstandsmoment ist auch kleiner als das Widerstandsmoment gegen Verformung im Schraubendreherspitzen-Abschnitt 9. Große Energiespitzen werden demgemäß eliminiert, so daß die Schraubendreherspitze 7 vor zu großer Belastung geschont bleibt verbunden mit einer erhöhten Lebensdauer.To screw in the Phillips screw 2, the screwdriver bit 1 is attached in such a way that his screwdriver tip 7 positively engages in the Phillips 6 of the Phillips screw. To step larger energy peaks during the screwing in of the Phillips screw, e.g. by a rapid increase in counterforce on the screw, this leads to a resistance that remains in the elastic range Torsion of the intermediate section 10, primarily on its area T. Its torsional modulus is also less than the section modulus Screwdriver tip section 9. Large energy spikes are accordingly eliminated so that the screwdriver tip 7 Protected against excessive loads remains associated with an increased service life.

    Die in Fig. 3 veranschaulichte zweite Ausführungsform des Schraubendrehereinsatzes 18 entspricht weitgehend der vorbeschriebenen Ausgestaltung. Gleiche Bauteile sind daher mit gleichen Bezugsziffern versehen. Abweichend von der ersten Ausführungsform geht nun vom Mehrkantabschnitt 11 eine Axialhöhlung 19 aus, die sich über den Zwischenabschnitt 10 erstreckt und vor dem Spitzenabschnitt 9 bzw. der Zone S endet. Auf diese Weise erhält man eine Änderung bzw. Anpassungsmöglichkeit für das Torsions-Widerstandsmoment des Zwischenabschnitts 10, so daß eine Torsion desselben eventuell schon bei sehrgeringer Belastung auftritt. Eine Variation kann man bei einer solchen Ausführungsform dadurch erhalten, daß im Durchmesser unterschiedlich große Axialhöhlungen gewählt werden.The second embodiment of the screwdriver bit 18 illustrated in FIG. 3 largely corresponds the design described above. The same components are therefore provided with the same reference numbers. Deviating from the first embodiment, an axial cavity 19 now extends from the polygonal section 11 which extends over the intermediate section 10 and ends before the tip section 9 or the zone S. In this way, a change or adaptation option for the torsional modulus is obtained of the intermediate section 10, so that torsion of the same may occur even at very low loads. A variation can be obtained in such an embodiment in that the diameter is different large axial cavities can be selected.

    Weiterhin läßt sich das Torsions-Widerstandmoment des Zwischenabschnitts durch seine Form und Querschnittsgröße 6 bestimmen. Es ist daher eine optimale Anpassung an die unterschiedlichsten Gegebenheiten möglich.Furthermore, the torsional modulus of the intermediate section can be determined by its shape and cross-sectional size 6 determine. It is therefore an optimal adaptation to a wide variety of circumstances possible.

    Claims (7)

    1. Screwdriver bit with terminal drive region for insertion in a machine chuck, an intermediate section and a power take-off region having a screwdriver tip (7) which has driving ribs (8) arranged uniformly over the periphery for engagement in cross-slotted screws, the apices (8') of which driving ribs (8) project radially beyond the cross-section of the intermediate section (10), characterised in that the intermediate section has a twistable zone, the ratio of diameter to length of the intermediate section (10) having constant cross-section is smaller than 0,5 and greater than 0,2 and the ratio of twist-yielding point and torsion modulus of the twistable zone T is such that for reaching the torque leading to plastic deformation/breakage, the restoring angle resulting from the elastic recovery power of the intermediate section (10) is 3,5 to 8 degrees, with the exception of such screwdriver bits in which the ratio of diameter to length of the intermediate section is smaller/equal to 0,253, and excepting those in which the restoring angle is smaller than 4,1 degrees.
    2. Screwdriver bit according to claim 1, characterised in that the ratio of diameter to length of the intermediate section, which is about 14mm long, is smaller than 0,5.
    3. Screwdriver bit according to one or more of the preceding claims, characterised in that the ratio of diameter to length of the intermediate section (10) extending to the apices (8') of the ribs (8) is 1:3 and about 1:4 to the tip (9') of the screwdriver bit.
    4. Screwdriver bit according to one or more of the preceding claims, characterised by an axial cavity (19) in the intermediate section (10).
    5. Screwdriver bit according to one or more of the preceding claims, characterised in that the apices (8') of the driving ribs (8) to their root forms a zone S, the dynamic torsional strength of which is smaller than that of the remaining intermediate section (10).
    6. Screwdriver bit according to one or more of the preceding claims, characterised in that the intermediate section (10) of constant circular cross-section extends to a frustum-shaped transition stage (16) for the polygonal section (11), which transition stage occupies only about 1/7 of the length of the intermediate section (10), and at this length brings about the transition to the cross-section of the polygonal section (11), which is about twice as large, having a cone angle of about 50°.
    7. Screwdriver bit according to one or more of the preceding claims, characterised in that the diameter of the intermediate section (10) is greater than the length of the zone S and somewhat smaller than the length (Ab) of the power take-off end section (9).
    EP89104230A 1988-03-10 1989-03-09 Screw driver bit Expired - Lifetime EP0336136B2 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    AT89104230T ATE75982T1 (en) 1988-03-10 1989-03-09 SCREWDRIVER BIT.

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE3807972 1988-03-10
    DE3807972 1988-03-10

    Publications (3)

    Publication Number Publication Date
    EP0336136A1 EP0336136A1 (en) 1989-10-11
    EP0336136B1 EP0336136B1 (en) 1992-05-13
    EP0336136B2 true EP0336136B2 (en) 1998-03-11

    Family

    ID=6349389

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP89104230A Expired - Lifetime EP0336136B2 (en) 1988-03-10 1989-03-09 Screw driver bit

    Country Status (6)

    Country Link
    EP (1) EP0336136B2 (en)
    JP (1) JPH02503405A (en)
    AT (1) ATE75982T1 (en)
    DE (1) DE58901364D1 (en)
    ES (1) ES2032619T5 (en)
    WO (1) WO1989008536A1 (en)

    Families Citing this family (10)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    DE4243608C2 (en) * 1992-12-22 2000-10-19 Werner Hermann Wera Werke Tool
    US5535867A (en) * 1993-11-01 1996-07-16 Coccaro; Albert V. Torque regulating coupling
    DE69415348T2 (en) * 1994-01-26 1999-04-29 Vermont American Corp SCREWDRIVER INSERT FOR USE WITH AN ELECTRIC SCREWDRIVER
    WO2010054169A1 (en) 2008-11-07 2010-05-14 Milwaukee Electric Tool Corporation Tool bit
    USD711719S1 (en) 2009-11-06 2014-08-26 Milwaukee Electric Tool Corporation Tool bit
    DE102010038210A1 (en) 2010-10-15 2012-04-19 Wera-Werk Hermann Werner Gmbh & Co. Kg Torque transmission device for use with a rotary impact driver
    US8955418B2 (en) 2013-03-08 2015-02-17 Black & Decker Inc. Threaded fastener driving tool
    US10022845B2 (en) 2014-01-16 2018-07-17 Milwaukee Electric Tool Corporation Tool bit
    CN212351801U (en) 2017-12-01 2021-01-15 米沃奇电动工具公司 Tool head for driving fasteners
    USD921468S1 (en) 2018-08-10 2021-06-08 Milwaukee Electric Tool Corporation Driver bit

    Family Cites Families (6)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    US2619860A (en) * 1946-08-14 1952-12-02 Jr Ralph E Gray Flexible tool with predetermined overload yielding means
    US2501386A (en) * 1947-11-13 1950-03-21 Gibbs George Gordon Portable power transmitting unit and changeable toolholder
    DE1603708A1 (en) * 1966-02-17 1970-09-17 Bauer & Schaurte Schrauben U M Procedure for tightening screws
    DE2231949A1 (en) * 1971-07-26 1973-02-08 Xerox Corp TORQUE TOOL
    SE7316910L (en) * 1973-12-14 1975-06-16 Irvator Ab TORQUE TOOL, SPECIAL TORQUE SLEEVE KEY.
    DE3538675A1 (en) * 1985-10-31 1987-05-07 Werner Hermann Wera Werke SCREWDRIVER INSERT

    Also Published As

    Publication number Publication date
    ES2032619T3 (en) 1993-02-16
    EP0336136A1 (en) 1989-10-11
    DE58901364D1 (en) 1992-06-17
    ATE75982T1 (en) 1992-05-15
    WO1989008536A1 (en) 1989-09-21
    JPH02503405A (en) 1990-10-18
    ES2032619T5 (en) 1998-07-01
    EP0336136B1 (en) 1992-05-13

    Similar Documents

    Publication Publication Date Title
    DE3907567C2 (en)
    DE2607338C2 (en) Knock-in dowel with expansion sleeve and expansion element
    DE2444899C2 (en) Drilling tool with drill and receiving part
    DE3242009C2 (en)
    EP0894202B1 (en) Screw for securing metal and/or plastic sections or plates on a substructure
    EP0336136B2 (en) Screw driver bit
    EP0573643B1 (en) Theaded fixation element, in particular a screw, and screw tool
    EP0292742A1 (en) Spacing screw
    WO2002000396A1 (en) Screw tool and production method thereof
    EP0610693B1 (en) Screw driven bit
    DE4143218C2 (en) Device for connecting screwdriver bits
    DE2644215C2 (en) screw
    DE4108771A1 (en) CHIPBOARD SCREW
    DE202018103106U1 (en) Bohrschraube
    DE102007052772A1 (en) Schraubendrehereinsatz
    EP0501201A1 (en) Set of elements for screwing dowels into a porous material
    DE4439973C2 (en) Tool for inserting a screw sleeve into building material and for screwing a screw into a receiving channel of the screw sleeve
    DE3907593A1 (en) SPREADING DOWEL
    DE10248102A1 (en) Joint connection for metal elements has fitting shank section of screw in rubbing contact with inside of holes formed in metal elements to be joined and has fine flutes and ribs distributed over periphery
    DE4425961A1 (en) Planetary gear unit and its use
    DE4106467C2 (en) Kit for screwing dowels into porous material
    EP2627481B1 (en) Torque transmission device, in particular in the form of a chuck for a bit
    DE2214466A1 (en) Combined tool consisting of a screwdriver and screw gripper
    DE7901696U1 (en) Screw head
    AT379874B (en) TWIST PROTECTION FOR SCREW ELEMENTS

    Legal Events

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

    Free format text: ORIGINAL CODE: 0009012

    AK Designated contracting states

    Kind code of ref document: A1

    Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

    17P Request for examination filed

    Effective date: 19891204

    17Q First examination report despatched

    Effective date: 19910315

    GRAA (expected) grant

    Free format text: ORIGINAL CODE: 0009210

    AK Designated contracting states

    Kind code of ref document: B1

    Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

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

    Ref country code: GR

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

    Effective date: 19920513

    Ref country code: BE

    Effective date: 19920513

    REF Corresponds to:

    Ref document number: 75982

    Country of ref document: AT

    Date of ref document: 19920515

    Kind code of ref document: T

    REF Corresponds to:

    Ref document number: 58901364

    Country of ref document: DE

    Date of ref document: 19920617

    ET Fr: translation filed
    GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
    ITF It: translation for a ep patent filed

    Owner name: STUDIO JAUMANN

    REG Reference to a national code

    Ref country code: ES

    Ref legal event code: FG2A

    Ref document number: 2032619

    Country of ref document: ES

    Kind code of ref document: T3

    PLBI Opposition filed

    Free format text: ORIGINAL CODE: 0009260

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

    Ref country code: LU

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

    Effective date: 19930331

    26 Opposition filed

    Opponent name: WIHA WERKZEUGE WILLI HAHN GMBH & CO. KG

    Effective date: 19930209

    PLAB Opposition data, opponent's data or that of the opponent's representative modified

    Free format text: ORIGINAL CODE: 0009299OPPO

    NLR1 Nl: opposition has been filed with the epo

    Opponent name: WIHA WERKZEUGE WILLI HAHN GMBH & CO.KG

    R26 Opposition filed (corrected)

    Opponent name: WIHA WERKZEUGE WILLI HAHN GMBH & CO. KG

    Effective date: 19930209

    EAL Se: european patent in force in sweden

    Ref document number: 89104230.1

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

    Ref country code: AT

    Payment date: 19960313

    Year of fee payment: 8

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

    Ref country code: CH

    Payment date: 19960325

    Year of fee payment: 8

    PLAW Interlocutory decision in opposition

    Free format text: ORIGINAL CODE: EPIDOS IDOP

    APAE Appeal reference modified

    Free format text: ORIGINAL CODE: EPIDOS REFNO

    APAC Appeal dossier modified

    Free format text: ORIGINAL CODE: EPIDOS NOAPO

    APAC Appeal dossier modified

    Free format text: ORIGINAL CODE: EPIDOS NOAPO

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

    Ref country code: AT

    Effective date: 19970309

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

    Ref country code: LI

    Effective date: 19970331

    Ref country code: CH

    Effective date: 19970331

    APAC Appeal dossier modified

    Free format text: ORIGINAL CODE: EPIDOS NOAPO

    PLAW Interlocutory decision in opposition

    Free format text: ORIGINAL CODE: EPIDOS IDOP

    REG Reference to a national code

    Ref country code: CH

    Ref legal event code: PL

    PUAH Patent maintained in amended form

    Free format text: ORIGINAL CODE: 0009272

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

    Free format text: STATUS: PATENT MAINTAINED AS AMENDED

    27A Patent maintained in amended form

    Effective date: 19980311

    AK Designated contracting states

    Kind code of ref document: B2

    Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

    REG Reference to a national code

    Ref country code: CH

    Ref legal event code: AEN

    Free format text: AUFRECHTERHALTUNG DES PATENTES IN GEAENDERTER FORM

    GBTA Gb: translation of amended ep patent filed (gb section 77(6)(b)/1977)
    NLR2 Nl: decision of opposition
    ET3 Fr: translation filed ** decision concerning opposition
    ITF It: translation for a ep patent filed

    Owner name: STUDIO JAUMANN P. & C. S.N.C.

    NLR3 Nl: receipt of modified translations in the netherlands language after an opposition procedure
    REG Reference to a national code

    Ref country code: ES

    Ref legal event code: DC2A

    Kind code of ref document: T5

    Effective date: 19980601

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

    Ref country code: GB

    Payment date: 20010212

    Year of fee payment: 13

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

    Ref country code: NL

    Payment date: 20010220

    Year of fee payment: 13

    REG Reference to a national code

    Ref country code: GB

    Ref legal event code: IF02

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

    Ref country code: GB

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

    Effective date: 20020309

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

    Ref country code: NL

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

    Effective date: 20021001

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

    Effective date: 20020309

    NLV4 Nl: lapsed or anulled due to non-payment of the annual fee

    Effective date: 20021001

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

    Ref country code: IT

    Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES;WARNING: LAPSES OF ITALIAN PATENTS WITH EFFECTIVE DATE BEFORE 2007 MAY HAVE OCCURRED AT ANY TIME BEFORE 2007. THE CORRECT EFFECTIVE DATE MAY BE DIFFERENT FROM THE ONE RECORDED.

    Effective date: 20050309

    APAH Appeal reference modified

    Free format text: ORIGINAL CODE: EPIDOSCREFNO

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

    Ref country code: ES

    Payment date: 20070313

    Year of fee payment: 19

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

    Ref country code: SE

    Payment date: 20070314

    Year of fee payment: 19

    Ref country code: DE

    Payment date: 20070314

    Year of fee payment: 19

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

    Ref country code: FR

    Payment date: 20070309

    Year of fee payment: 19

    EUG Se: european patent has lapsed
    REG Reference to a national code

    Ref country code: FR

    Ref legal event code: ST

    Effective date: 20081125

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

    Ref country code: SE

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

    Effective date: 20080310

    Ref country code: DE

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

    Effective date: 20081001

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

    Ref country code: FR

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

    Effective date: 20080331

    REG Reference to a national code

    Ref country code: ES

    Ref legal event code: FD2A

    Effective date: 20080310

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

    Ref country code: ES

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

    Effective date: 20080310