EP1422027B1 - Screw driving tool, in particular screwdriver bit - Google Patents

Screw driving tool, in particular screwdriver bit Download PDF

Info

Publication number
EP1422027B1
EP1422027B1 EP03028939A EP03028939A EP1422027B1 EP 1422027 B1 EP1422027 B1 EP 1422027B1 EP 03028939 A EP03028939 A EP 03028939A EP 03028939 A EP03028939 A EP 03028939A EP 1422027 B1 EP1422027 B1 EP 1422027B1
Authority
EP
European Patent Office
Prior art keywords
front part
part according
section
penetration
length
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
EP03028939A
Other languages
German (de)
French (fr)
Other versions
EP1422027A2 (en
EP1422027A3 (en
Inventor
Horst Holland-Letz
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.)
Felo Werkzeugfabrik Holland Letz GmbH
Original Assignee
Felo Werkzeugfabrik Holland Letz GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE20218102U external-priority patent/DE20218102U1/en
Priority claimed from DE20304246U external-priority patent/DE20304246U1/en
Priority claimed from DE20310364U external-priority patent/DE20310364U1/en
Application filed by Felo Werkzeugfabrik Holland Letz GmbH filed Critical Felo Werkzeugfabrik Holland Letz GmbH
Publication of EP1422027A2 publication Critical patent/EP1422027A2/en
Publication of EP1422027A3 publication Critical patent/EP1422027A3/en
Application granted granted Critical
Publication of EP1422027B1 publication Critical patent/EP1422027B1/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
    • B25B15/00—Screwdrivers
    • B25B15/001—Screwdrivers characterised by material or shape of the tool bit
    • B25B15/002—Screwdrivers characterised by material or shape of the tool bit characterised by material used or surface finishing
    • 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
    • B25B15/004—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section
    • B25B15/005—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section with cross- or star-shaped cross-section

Definitions

  • the invention relates to a front part for a screwing according to the type specified in the preamble of claim 1, and a screwing with such a front part.
  • Screwing tools of this type can be designed in particular for Phillips screws or TORX ® screws, but also for screws with other inner profiles and realized on screwdriver inserts or on screwdriver blades.
  • the front part consists of a hard metal body produced by pressing or injection molding and then sintering metal powder, which is fixed to a drive part made of steel.
  • the length of the hard metal front part is at most equal to 2.2 times the length of a penetrating portion to be inserted into a screw.
  • the profile section of the front part has a relatively short length.
  • the grooves of the penetration section merge via a radially outwardly curved outlet or transition section into a base section, which is connected to the drive part of the screwdriver insert.
  • the aim is, the Overall length of the penetration portion and also the length of the front part as short as possible to achieve a high compression and a homogeneous structure to the tip of the profile section and the profile webs when pressing the blank of metal powder.
  • the surface area of the blank will be kept small so that the frictional resistance upon ejection from the forming die is small and the formation of hairline cracks that may occur when the ejector pressure acting on the blank becomes too high and the load capacity of the frontal tungsten carbide tip are avoided greatly reduce. Nevertheless, the reproducibility of such operations is not yet fully satisfactory.
  • a screwdriver insert is known ( FR 2 469 250 A ), wherein a base portion has a perpendicular to the longitudinal axis extending end face from which projects a conical, cross-shaped profile section.
  • the transitions from the profile section into the base section are largely sharp-edged and have no defined radii, but only radii, as they usually result as a result of pressing the profile tip in a mold.
  • When loaded by a torque occur at the transition edges high voltages, which has a high risk of breakage in particular in case of sudden increase in torsional load.
  • the axial distance of the mouth line of the central, planar surfaces in the lateral surface of the intermediate portion of the base of the cone formed from the Eindringabites and the intermediate portion is at most half as large as the distance of the mouth line from the top of the cone.
  • the opening angle between the groove bottoms and the inclined middle levels is approx. 130 °.
  • the transitions from the groove bottoms in the flat outlet surfaces and the web edges in the triangular facets are not defined.
  • the invention has the object of providing the front part of a ffertechnikzugs of the type described in such a way that despite its production of hard metal powder and even its profile section with a comparatively short length, a high breaking and torsional strength is achieved.
  • the invention has the advantage that a high breaking and torsional strength is achieved and the carbide screwing tools can be produced reproducibly, since both the groove bottoms and the flanks of the crossbars terminate by means of curved transition surfaces formed in the end face of the base portion.
  • angular contact points in these areas apparently due to the brittleness of cemented carbide under load, lead to stress peaks which lead to breakage of the profile peak at load values which are below the values demanded by the standards and which occur in practice.
  • the invention is particularly applicable screwdriver bits so as in the Phillips ® with a Kreuzspitze - or Pozidriv ® system advantageous.
  • an inventive screwing tool in the form of a screwdriver insert of an elongated, one-piece body 1 having at one end a drive part 2 with a polygonal profile 3, in a corresponding receptacle or in a feed of a rotary tool, for , As a motor wrench, can be used.
  • a front end of the drive part 2 merges into a profiled front part 4 of the screwing tool.
  • the front part 4 contains a shaft-shaped base section 5 which adjoins the drive part 2 and which is cylindrical here.
  • At its side remote from the drive part 2 end face is followed by a profile section 6, which is like the base portion 5 and the drive part 2 coaxial with a common longitudinal axis 7.
  • the profile section 6 includes at a front end of a conventional, conical cross point with four cross-shaped webs 8, which are radial to the longitudinal axis 7.
  • the outer edges of the webs 8 converge toward a tip 9.
  • the back ends the webs 8 go over into the front side of the base portion 5.
  • V-shaped recesses or grooves 10 with groove bottoms 11 (FIG. 3), which in a bordering to the tip 9 penetration portion 12, which serves to penetrate the cross point in the corresponding Phillips profile of an associated screw, straight are formed.
  • Phillips ® have a triangular cross-section or are concave roof-shaped and have a linear ridge line, as shown in FIGS. 2 and 4 show.
  • the penetration section 12 is adjoined by a transition section 14 (FIGS. 1 and 3) arranged between it and the base section 5 and forming the rear end of the profile section 6.
  • a transition section 14 (FIGS. 1 and 3) arranged between it and the base section 5 and forming the rear end of the profile section 6.
  • the transition surfaces 15 go outwardly into a respective surface portion 16, which is formed according to FIG. 2 in particular transversely arched.
  • the corresponding surface portions 16 of all four grooves 10 at the same time form between the webs 8 remaining free parts of an end face of the adjacent base portion 5, which is interrupted in each case by the adjoining them base surfaces of the webs 8. As shown in Fig.
  • the surface portions 16 are inclined to the longitudinal axis 7 at angles ⁇ , which - measured in the central axes of the surface portions 16 enclosing radial planes - preferably between 75 ° and 85 ° and with particular advantage at about 85 °.
  • Fig. 3 shows, in particular, that the groove bottoms 11 pass continuously into the surface sections 16 by means of the transitional surfaces 15.
  • the transition surfaces 15 are preferably curved with radii of 0.15 mm to 2.0 mm, wherein radii of curvature of 0.5 mm to 1.5 mm are preferred.
  • the radius of curvature of course, depending on the sizes of the profile tips, which are specified by standards and divided into screwdrivers for Phillips screws in the sizes 00 to 4, to choose different sizes or adapt to the profile tips. The same applies to screwing tools for the TORX ® system.
  • transition surfaces 15 and the surface sections 16 adjoining them in a radially continuous manner until they reach the lateral surface of the base section 5 (eg. PCT-WO 01/66312 A1 ), wherein throughout the same, but also different radii of curvature can be used, the z. B. in the region of the transition surfaces 15 are smaller than in the region of the surface portions 16.
  • the surface sections 16 are connected in the lateral direction and on both sides by second transitional surfaces 17a, 17b to the rearward ends of lateral flanks 8a of the respectively adjacent webs 8.
  • the second transitional surfaces 17a, 17b have in the transverse direction, starting from the flanks 8a, preferably radii of curvature of 0.15 mm to 2.0 mm, with particular advantage of 0.4 mm to 1.5 mm.
  • the radii of curvature expediently increase steadily from a location close to the groove bottoms 11 radially outward to the peripheral surface of the base section 5, so that a three-dimensionally curved outlet is formed overall.
  • the surface portions 16 are triangular, lying in the extensions of the groove bottoms 11 and the first transition surfaces 15 surfaces on the lateral, radially extending edges of the second transitional surfaces 17a, 17b begin, which then gradually tangentially open into the web flanks 8a ,
  • transitional surfaces 17a, 17b are, as indicated in Fig. 2, curved in the transverse direction with a uniform radius. The respective radius can then also be equal to the outside from the first transition surface 15.
  • the radii of curvature of the transition surfaces 17a, 17b may also change in the transverse direction. This is indicated in the exemplary embodiment according to FIG. 4 in that the transitional surfaces 17a, 17b are composed of partial surfaces 17a1, 17a2 and 17b1, 17b2, the partial surfaces 17a1, 17b1 starting at the web flanks 8a and having larger radii of curvature than those adjoining them Partial surfaces 17a2, 17b2 have, here to a planar surface portion 16 'shown out leak. Otherwise, the embodiment of FIG. 4 corresponds to that of FIG. 1 to 3, which is why the same parts are provided with the same reference numerals.
  • the groove bottoms 11 shown rounded in FIGS. 1 to 3 can also be shaped differently. Instead of a roof-shaped cross section, other and in particular such cross sections could be provided, as are common in the case of screws of the various systems.
  • the length dimensions of the various parts or sections preferably correspond substantially to those of the document PCT WO 01/66312 A1 are known.
  • the ratios of the lengths LP of the profile sections 6 to the lengths L0 of the penetration sections 12 are preferably less than 1.5 and are preferably 1.25 to 1.85. In absolute terms, z.
  • As the length L0 of the penetration portion 12 between 1.50 mm and 4.00 mm, depending on the size and screw system.
  • the diameter d0 (FIGS. 1 and 3) of the penetration section 12 is between 2.3 mm and 8.0 mm at a distance L0 from the tip 9.
  • the dimension L0 is in the context of the present application at least equal to the greatest depth of the inner profile in a screw head certain profile size, z. B. Pozidriv ® 2. Conveniently, a measure is selected for L0, resulting from the largest penetration depth plus a small surcharge.
  • the dimension LP is in the context of the present application, the measure of the tip 9 of the front part 4 to the outlet of the transition section 14 in the base portion 5, wherein the boundary of this outlet, the intersection line of the surface portions 16 with the peripheral surface of the base portion 5 is defined.
  • the base portion 5 may have a cylindrical, hexagonal or other shaped cross-sectional contour.
  • transition section 14 between the penetration portion 12 and base portion 5 d. H. the combination of small radii and curved surfaces, a good power flow is achieved, thereby further increasing the breaking strength under torsional load of the tip.
  • FIGS. 5 and 6 relate to an embodiment of a screwing tool in the form of a screwdriver bit for Pozidriv ® system.
  • bottoms 20 of V-shaped grooves 21 are provided in their central regions with comb-like elevations 22 having triangular cross-sections.
  • the surface portions 16 may be provided in their middle regions, each with a comb-like, radially extending elevation 23, as Fig. 5 shows.
  • the surface portions 16 are replaced by surface portions 24, which are concave in the view of FIG. 6 and the transition surfaces 17 a, 17 b continuously connect with each other. In this case, therefore, the end surface of the base portion 5 is formed by the concave surface portions 24.
  • Figs. 7 and 8 show an embodiment substantially corresponding to Figs. 1 to 4, which is why the same parts are again provided with the same reference numerals.
  • the lengths L0 determined according to the maximum penetration depths T (FIG. 8) in corresponding inner profiles 40 of screw heads 41 of assigned sizes and types, are approximately 5% to 20% compared to the usual one, according to FIGS manufactured screwdriver inserts be shortened.
  • the portion 42 of the penetrating portion 12 due to the shortening is indicated by dotted lines.
  • An advantageous range of the cut K is between 7% and 12% of the length L0.
  • a reduction of 10% results in the following measures L0K for the shortened length:
  • the initial length L0 of the penetration section 12 is chosen about 3 to 5% longer than the respective maximum penetration depth T.
  • the profile contour outside the screw head 41 will continue somewhat.
  • the profile contour itself is determined by the ISO and factory standards, starting from the profile tip.
  • the shortening of the dimensions L0 and L0K naturally also results in a corresponding shortening of the dimensions LP to LPK, whereby the contours of the transitional surfaces 15 and surface sections 16 remain unchanged, even with a shortened L0K, as with uncut L0.
  • the shortening of the penetration section 12 by the dimension K has an effect due to the shaping of cemented carbide powder (eg after PCT-WO 01/66312 A1 ) in particular advantageous in applications with cross-slot profiles.
  • This measure has namely on the one hand the consequence that the axial ejection of the front part 4 from the forming die, the friction due to the smaller total surface area is lower.
  • the shortening at the tip of the penetration section 12 - at least in the case of conical cross tips - leads to an enlargement of the cross-sectional area of a tip 43, thus to a lower surface pressure during ejection and thereby to a reduction in the risk of the formation of hairline cracks.
  • the ratio of the length LPK of the shortened profile section to the length L0 of the correspondingly shortened penetration section 12 in this embodiment is 1.20 to 1.90 and is preferably greater than 1.5.
  • Fig. 9 which shows a cross section through a particular for cross-slotted screws Pozidriv ® system profile tip, on the radial outer edges of the 5 formed in the other as shown in Fig. Webs either rounding 45 or bevels 46 8 is provided.
  • the radius r of the rounding is about 10% to 12% of the thickness b of the webs 8.
  • the thickness b is constant in the system Pozidriv ® over the length L0 of the profile, which is why the radius of the fillets 45 can be selected substantially constant.
  • Phillips ® starch is b greater toward the tip 9 forth to the junction surface 15, and therefore the radius r of the tip to the transition surface 15 can be down somewhat larger. But it can also be constant and be chosen according to a mean thickness of the webs 8 on their longitudinal extent.
  • the width a of the bevels 46 is preferably selected in a ratio of 6% to 10% to the thickness b of the webs 8.
  • FIG. 10 shows such a variant on the basis of a screwing tool designed in accordance with FIG. 1 and enlarged in the region of the profile tip, wherein the same parts are provided with the same reference numerals as in FIG. 1.
  • Fig. 10 the front part 4 of the screwdriver insert is shown with a profile tip of the system Pozidriv ® .
  • the side edges 8a of the webs 8 extend substantially parallel on their longitudinal extension.
  • one edge of each of the four cross-shaped webs 8 is slightly bevelled in the front region.
  • the angle of a demolding slope formed thereby lies between 1 ° and 5 ° with respect to a radial plane which encloses the longitudinal axis 7 and an imaginary center plane of the webs 8.
  • the attachment of a bevel 47 forming the Entformungsschräge takes place at that edge which is loaded when unscrewing screws and is designated in Fig.
  • expiring surface portions 16 each have a preferably saddle-shaped (concave) recess 49 is attached.
  • Such recesses 49 are shown schematically in FIGS. 11 and 12, which otherwise correspond to FIGS. 2 and 3.
  • the recesses 49 can also be realized as planar, incorporated in the surface portions 16 surfaces.
  • the funnel-like shape of the cut core (FIG. 12) is improved by these recesses 49.
  • the surface portion 16 extends at a small angle substantially radially, namely the filling of the tread tip is favored during deformation of the blank by pressing or injection molding, because the mass flow better in the profile pockets are routed in the matrix.
  • the surfaces 49 are even better visible. Their concave curvature in the circumferential direction directs the mass flow also to the side to the profile pockets in the die.
  • the torsional forces acting on the webs 8 are guided into the base section 5 via the rounded, second transition surfaces 17a, 17b. In this case, however, the effect of the second transitional surfaces 17a, 17b, whose radii are larger from the Nutenböden 11 to the outside, should not be disturbed.
  • the recesses 49 are expediently arranged only in the radially outer region and extending in the circumferential direction only over such a region that they end laterally in front of the second transitional surfaces 17a, 17b.
  • the vaulted transition zones formed by these obtained by means of which the stresses occurring under load of the webs 8 are kept small.
  • a very dense, homogeneous filling of the pockets of the mold during pressing or injection molding of the blanks can be achieved with the recesses 49.
  • the angle formed by the recesses or surfaces 49 with the longitudinal axis 7 in a radial plane containing them and defined by the surface 49 should be significantly smaller than the angle ⁇ (FIG. 12) and is expediently less than 85 °. It also shows in particular Fig. 12, that the dimension LP is increased by the formation of the recess 49, so that the ratio LP to LO in the presence of the recesses 49 is greater than in the absence of these recesses 49 fails. In particular, in this embodiment, therefore good results are achieved even with ratios LP / L0> 1.5.
  • the inventive design of the profile section 6 or 29, 30 brings benefits not only for front parts of hard metal, which are preformed by pressing metal powder, but also for those that are preformed by injection molding. This also applies to screwdriver inserts, in which the front part 4, 26 is part of a one-piece body, the blank is preferably preformed by injection molding. In addition, this also applies accordingly for made of hard metal, the profile sections 6 and 29, 30 according to the invention having front parts, which at their backs, z. B. by means of suitable anchoring elements, are attached to the remaining steel existing shafts of blades of hand screwdrivers.
  • the radii of curvature of the transition surfaces may also be substantially the same.
  • the outgoing surface portions 16, 37 may also be composed of surfaces which lie next to one another in the circumferential direction or in the radial direction and have different radii of curvature. The same applies to the first transition surfaces 15 and 36.
  • screwing tools described can also be made of metal powders other than the described hard metal powders.
  • z. B also suitable those powder mixtures that lead to screwing tools made of high speed steel.
  • the individual metal powder composition or alloy to be chosen depends largely on the needs of the individual case.

Abstract

The screwdriver tool has a sintered metal powder profiled front part with base section (5) and profiled section with transition section inbetween which has first curved transition faces (15) connecting grooved bases (11) to flat sections (16), and second curved transition faces (17a,17b) which connect the flat sections sideways to the web flanks (8a) Independent claim describes front part for screwdriver tool used as screwdriver insert.

Description

Die Erfindung betrifft ein Vorderteil für ein Schraubwerkzeug gemäß der im Oberbegriff des Anspruchs 1 angegebenen Gattung, und ein Schraubwerkzeug mit einem solchen Vorderteil.The invention relates to a front part for a screwing according to the type specified in the preamble of claim 1, and a screwing with such a front part.

Schraubwerkzeuge dieser Art können insbesondere für Kreuzschlitzschrauben oder TORX®-Schrauben, aber auch für Schrauben mit anderen Innenprofilen ausgebildet und an Schraubendreher-Einsätzen oder auch an Schraubendreher-Klingen realisiert sein.Screwing tools of this type can be designed in particular for Phillips screws or TORX ® screws, but also for screws with other inner profiles and realized on screwdriver inserts or on screwdriver blades.

Bei einem bekannten, als Schraubendreher-Einsatz ausgebildeten Schraubwerkzeug dieser Art ( PCT-WO 01/66312 A1 ) besteht das Vorderteil aus einem durch Pressen oder Spritzgießen und anschließendes Sintern aus Metallpulver hergestellten Hartmetallkörper, der an einem aus Stahl hergestellten Antriebsteil befestigt ist. Die Länge des aus Hartmetall bestehenden Vorderteils ist höchstens gleich dem 2,2-fachen der Länge eines in eine Schraube einzusetzenden Eindringabschnitts. Bei einem derartigen Schraubendreher-Einsatz hat der Profilabschnitt des Vorderteils eine relativ kurze Länge. Die Nuten des Eindringabschnittes gehen über einen radial nach außen gewölbten Auslauf- bzw. Übergangsabschnitt in einen Basisabschnitt über, der mit dem Antriebsteil des Schraubendreher-Einsatzes verbunden ist. Dabei wird angestrebt, die Länge des Eindringabschnittes und auch die Länge des Vorderteils insgesamt möglichst kurz auszubilden, um beim Pressen des Rohlings aus Metallpulver eine hohe Verdichtung und ein homogenes Gefüge bis in die Spitze des Profilabschnittes und dessen Profilstege zu erreichen. Außerdem wird die Oberfläche des Rohlings klein gehalten werden, damit der Reibungswiderstand beim Ausstoßen aus der Formmatrize klein ist und die Bildung von Haarrissen vermieden wird, die auftreten können, wenn der auf den Rohling wirkende Auswerferdruck zu hoch wird, und die Belastbarkeit des Vorderteiles aus Hartmetall stark vermindern. Dennoch ist die Reproduzierbarkeit derartiger Einsätze noch nicht voll befriedigend.In a known, designed as a screwdriver insert screwing tool of this type ( PCT-WO 01/66312 A1 ), the front part consists of a hard metal body produced by pressing or injection molding and then sintering metal powder, which is fixed to a drive part made of steel. The length of the hard metal front part is at most equal to 2.2 times the length of a penetrating portion to be inserted into a screw. In such a screwdriver insert, the profile section of the front part has a relatively short length. The grooves of the penetration section merge via a radially outwardly curved outlet or transition section into a base section, which is connected to the drive part of the screwdriver insert. The aim is, the Overall length of the penetration portion and also the length of the front part as short as possible to achieve a high compression and a homogeneous structure to the tip of the profile section and the profile webs when pressing the blank of metal powder. In addition, the surface area of the blank will be kept small so that the frictional resistance upon ejection from the forming die is small and the formation of hairline cracks that may occur when the ejector pressure acting on the blank becomes too high and the load capacity of the frontal tungsten carbide tip are avoided greatly reduce. Nevertheless, the reproducibility of such operations is not yet fully satisfactory.

Daneben ist ein Schraubendreher-Einsatz bekannt ( FR 2 469 250 A ), bei dem ein Basisabschnitt eine rechtwinklig zur Längsachse verlaufende Stirnfläche aufweist, von der ein konischer, kreuzförmiger Profilabschnitt absteht. Die Übergänge vom Profilabschnitt in den Basisabschnitt sind weitgehend scharfkantig ausgebildet und weisen keine definierten Radien, sondern nur Radien auf, wie sie sich üblicherweise als Folge des Pressens der Profilspitze in einer Form ergeben. Bei Belastung durch ein Drehmoment treten an den Übergangskanten hohe Spannungen auf, was eine hohe Bruchgefahr insbesondere bei plötzlich ansteigender Torsionsbelastung zur Folge hat.In addition, a screwdriver insert is known ( FR 2 469 250 A ), wherein a base portion has a perpendicular to the longitudinal axis extending end face from which projects a conical, cross-shaped profile section. The transitions from the profile section into the base section are largely sharp-edged and have no defined radii, but only radii, as they usually result as a result of pressing the profile tip in a mold. When loaded by a torque occur at the transition edges high voltages, which has a high risk of breakage in particular in case of sudden increase in torsional load.

Die Herstellung von Schraubendreher-Einsätzen aus Werkzeugstahl erfolgt demgegenüber in der Regel durch formgebende Bearbeitung von aus Werkzeugstahl bestehenden Rohlingen, indem diese z. B. vorgedreht und durch radiales Pressen oder durch spanende Bearbeitung mit Profilen versehen werden. Daher treten hier die beschriebenen, durch Pressen oder Spritzgießen von Hartmetallpulvern verursachten Probleme nicht auf. Stattdessen wird bei solchen Einsätzen z.B. bemängelt, daß ihre Hals- bzw. Basisabschnitte herstellungsbedingt zu lang und daher bei gegebener Gesamtlänge die Antriebs- bzw. Einspannabschnitte zu kurz ausfallen. Daher ist es bei solchen Einsätzen bekannt ( DE 296 21 782 U1 ), die Nutenböden des Eindringabschnitts über kurze Zwischenabschnitte mit dem Einspannabschnitt zu verbinden und die Zwischenabschnitte dabei je einer in der Mitte angeordneten, schrägen und ebenen Fläche sowie zwei seitlich davon angeordneten, im wesentlichen dreieckförmigen Flächen (Facetten) zu versehen. Der axiale Abstand der Mündungslinie der mittleren, ebenen Flächen in die Mantelfläche des Zwischenabschnitts von der Grundfläche des aus dem Eindringabschnitt und dem Zwischenabschnitt gebildeten Kegels ist dabei maximal halb so groß wie der Abstand der Mündungslinie von der Spitze des Kegels. Der Öffnungwinkel zwischen den Nutenböden und den schrägen mittleren Ebenen beträgt ca. 130°. Die Übergänge von den Nutenböden in die ebenen Auslaufflächen und der Stegflanken in die dreieckförmigen Facetten sind nicht näher definiert.The manufacture of screwdriver bits made of tool steel is usually done by shaping processing of existing tool steel blanks by these z. B. pre-turned and provided by radial pressing or by machining with profiles. Therefore, the described problems caused by pressing or injection molding of hard metal powders do not occur here. Instead, in such applications, for example, criticized that their neck or base sections manufacturing reasons too long and therefore for a given overall length, the drive or clamping sections fail too short. Therefore, it is known in such operations ( DE 296 21 782 U1 ), the groove bottoms of the Eindringabschnitts to connect via short intermediate sections with the clamping section and the intermediate sections in each case one arranged in the middle, oblique and flat surface and two laterally arranged therefrom, substantially triangular surfaces (facets) to provide. The axial distance of the mouth line of the central, planar surfaces in the lateral surface of the intermediate portion of the base of the cone formed from the Eindringabschnitt and the intermediate portion is at most half as large as the distance of the mouth line from the top of the cone. The opening angle between the groove bottoms and the inclined middle levels is approx. 130 °. The transitions from the groove bottoms in the flat outlet surfaces and the web edges in the triangular facets are not defined.

Der Erfindung liegt die Aufgabe zugrunde, das Vorderteil eines Schraubwerkezugs der eingangs bezeichneten Gattung so auszubilden, daß trotz seiner Herstellung aus Hartmetallpulver und auch bei vergleichsweise kurzer Länge seinen Profilabschnitts eine hohe Bruch- und Torsionsfestigkeit erzielt wird.The invention has the object of providing the front part of a Schraubwerkzugs of the type described in such a way that despite its production of hard metal powder and even its profile section with a comparatively short length, a high breaking and torsional strength is achieved.

Zur Lösung dieser Aufgabe dienen die Merkmale des Anspruchs 1.To solve this problem serve the features of claim 1.

Die Erfindung bringt den Vorteil mit sich, daß eine hohe Bruch- und Torsionsfestigkeit erzielt wird und die Hartmetall-Schraubwerkzeuge reproduzierbar hergestellt werden können, da sowohl die Nutenböden als auch die Flanken der Kreuzstege mittels gekrümmt ausgebildeter Übergangsflächen in die Stirnfläche des Basisabschnitts auslaufen. Dagegen führen kantige Übergangsstellen in diesen Bereichen offenbar aufgrund der Sprödigkeit von Hartmetall unter Belastung zu Spannungsspitzen, die zu einem Bruch der Profilspitze bei Belastungswerten führen, welche unter den nach den Normen verlangten und in der Praxis auftretenden Werten liegen. Wie langwierige Untersuchungen bei der Entwicklung von Hartmetall-Vorderteilen ergeben haben, ist es erforderlich, die Einzelbereiche des Auslaufs im Detail zu gestalten, um durch Wahl der Rundungsradien, deren Verlauf in Radial- und Umfangsrichtung, der Übergänge ineinander und der Auslaufwinkel einerseits zu erreichen, daß der Materialfluß beim Pressen eines Rohlings aus Metallpulver oder beim Spritzgießen eines Rohlings mit einem zusätzlichen Kunststoffbindemittel in der Metallpulvermasse von dem Basisabschnitt in die Profilspitzen und -stege gleichmäßig und ungestört verläuft, andererseits die bei Belastung auftretenden Spannungen unter Vermeidung von Spannungsspitzen vom Eindringabschnitt so in den Basisabschnitt einzuleiten, daß die Belastbarkeit den Anforderungen in der Praxis des Einsatzes derartiger Schraubendreher-Einsätze entspricht.The invention has the advantage that a high breaking and torsional strength is achieved and the carbide screwing tools can be produced reproducibly, since both the groove bottoms and the flanks of the crossbars terminate by means of curved transition surfaces formed in the end face of the base portion. On the other hand, angular contact points in these areas, apparently due to the brittleness of cemented carbide under load, lead to stress peaks which lead to breakage of the profile peak at load values which are below the values demanded by the standards and which occur in practice. As lengthy investigations in the development of carbide front parts have shown, it is necessary to design the individual areas of the outlet in detail in order to achieve by choosing the rounding radii, their course in the radial and circumferential direction, the transitions into each other and the outlet angle on the one hand, that the material flow when pressing a blank made of metal powder or injection molding a blank with an additional plastic binder in the metal powder mass of the base portion in the profile peaks and webs runs smoothly and undisturbed, on the other hand, the stresses occurring under load Avoiding voltage peaks from the penetration section so into the base section initiate that the load capacity meets the requirements in practice of the use of such screwdriver inserts.

Weitere vorteilhafte Merkmale der Erfindung ergeben sich aus den Unteransprüchen.Further advantageous features of the invention will become apparent from the dependent claims.

Die Erfindung ist insbesondere bei Schraubendreher-Einsätzen mit einer Kreuzspitze so wie beim dem Phillips®- oder Pozidriv®-System vorteilhaft.The invention is particularly applicable screwdriver bits so as in the Phillips ® with a Kreuzspitze - or Pozidriv ® system advantageous.

Nachfolgend werden Ausführungsbeispiele der Erfindung unter Bezugnahme auf die Zeichnungen näher erläutert, ohne daß hierdurch der Schutzbereich der Erfindung eingeschränkt werden soll. Es zeigen:

  • Fig. 1 eine Seitenansicht eines Schraubwerkzeugs mit einem Vorderteil gemäß der Erfindung in Form eines Schraubendreher-Einsatzes in schematischer Darstellung;
  • Fig. 2 eine perspektivische Darstellung des Schraubwerkzeugs nach Fig. 1, jedoch unter Weglassung eines Antriebteils;
  • Fig. 3 einen Längsschnitt in der Ebene III-III der Fig. 2;
  • Fig. 4 eine der Fig. 2 entsprechende Darstellung eines anderen Ausführungsbeispiels des erfindungsgemäßen Schraubwerkzeugs aus Richtung eines Pfeils IV in Fig. 3;
  • Fig. 5 und 6 perspektivische Darstellungen von zwei weiteren Ausführungsbeispielen des erfindungsgemäßen Schraubwerkzeugs in Form von für das Pozidriv®-System bestimmten Schraubendreher-Einsätzen;
  • Fig. 7 eine Seitenansicht eines erfindungsgemäßen Schraubwerkzeugs in Form eines mit einem verkürzten Eindringabschnitt versehenen Schraubendreher-Einsatzes;
  • Fig. 8 das Schraubwerkzeug nach Fig. 7 beim Eindringen in das Innenprofil einer zugehörigen Schraube;
  • Fig. 9 einen Querschnitt durch ein weiteres Ausführungsbeispiel eines Profilabschnitts eines erfindungsgemäßen Schraubwerkzeugs etwa in Höhe einer Schnittlinie IX-IX der Fig. 7;
  • Fig. 10 eine Seitenansicht eines weiteren Ausführungsbeispiels eines erfindungsgemäßen Schraubwerkzeugs in Form eines für das Pozidriv®-System geeigneten Schraubendreher-Einsatzes;
  • Fig. 11 eine der Fig. 2 entsprechende, perspektivische Ansicht eines weiteren Ausführungsbeispiels eines erfindungsgemäßen Schraubwerkzeugs; und
  • Fig. 12 einen der Fig. 3 entsprechenden Längsschnitt durch das Schraubwerkzeug nach Fig. 11.
Hereinafter, embodiments of the invention will be explained in more detail with reference to the drawings, without thereby limiting the scope of the invention. Show it:
  • Figure 1 is a side view of a screwing tool with a front part according to the invention in the form of a screwdriver bit in a schematic representation.
  • Fig. 2 is a perspective view of the screwing tool of Figure 1, but with the omission of a drive member.
  • Fig. 3 is a longitudinal section in the plane III-III of Fig. 2;
  • FIG. 4 shows a representation corresponding to FIG. 2 of another embodiment of the screwing tool according to the invention from the direction of an arrow IV in FIG. 3; FIG.
  • 5 and 6 are perspective views of two further embodiments of the screwing tool according to the invention in the form of intended for the Pozidriv ® system screwdriver bits;
  • 7 shows a side view of a screwing tool according to the invention in the form of a screwdriver insert provided with a shortened penetration section;
  • FIG. 8 shows the screwing tool according to FIG. 7 upon penetration into the inner profile of an associated screw; FIG.
  • 9 shows a cross section through a further embodiment of a profile section of a screwing tool according to the invention approximately at the level of a section line IX-IX of FIG. 7;
  • Figure 10 is a side view of a further embodiment of a screwing tool according to the invention in the form of a Pozidriv ® for the system suitable screwdriver bit.
  • FIG. 11 shows a perspective view, corresponding to FIG. 2, of a further embodiment of a screwing tool according to the invention; and
  • FIG. 12 shows a longitudinal section corresponding to FIG. 3 through the screwing tool according to FIG. 11.

Gemäß Fig. 1 bis 3 besteht ein erfindungsgemäßes Schraubwerkzeug in Form eines Schraubendreher-Einsatzes aus einem langgestreckten, einstückigen Körper 1, der an einem Ende ein Antriebsteil 2 mit einem Mehrkantprofil 3 aufweist, das in eine entsprechende Aufnahme oder in ein Futter eines Drehwerkzeugs, z. B. eines Motorschraubers, eingesetzt werden kann. Ein Vorderende des Antriebsteils 2 geht in ein profiliertes Vorderteil 4 des Schraubwerkzeugs über. Das Vorderteil 4 enthält einen an das Antriebsteil 2 ansetzenden, schaftförmigen Basisabschnitt 5, der hier zylindrisch ausgebildet ist. An dessen vom Antriebsteil 2 abgewandte Stirnseite schließt sich ein Profilabschnitt 6 an, der wie der Basisabschnitt 5 und das Antriebsteil 2 koaxial zu einer gemeinsamen Längsachse 7 ist.According to Fig. 1 to 3, an inventive screwing tool in the form of a screwdriver insert of an elongated, one-piece body 1 having at one end a drive part 2 with a polygonal profile 3, in a corresponding receptacle or in a feed of a rotary tool, for , As a motor wrench, can be used. A front end of the drive part 2 merges into a profiled front part 4 of the screwing tool. The front part 4 contains a shaft-shaped base section 5 which adjoins the drive part 2 and which is cylindrical here. At its side remote from the drive part 2 end face is followed by a profile section 6, which is like the base portion 5 and the drive part 2 coaxial with a common longitudinal axis 7.

Der Profilabschnitt 6 enthält an einem Vorderende eine übliche, konische Kreuzspitze mit vier kreuzförmig angeordneten Stegen 8, die radial zur Längsachse 7 stehen. Die Außenkanten der Stege 8 konvergieren zu einer Spitze 9 hin. Die rückwärtigen Enden der Stege 8 gehen in die Stirnseite des Basisabschnitts 5 über. Zwischen je 2 benachbarten Stegen 8 liegen V-förmige Ausnehmungen bzw. Nuten 10 mit Nutenböden 11 (Fig. 3), die in einem an die Spitze 9 grenzenden Eindringabschnitt 12, der zum Eindringen der Kreuzspitze in das entsprechende Kreuzschlitzprofil einer zugeordneten Schraube dient, geradlinig ausgebildet sind. Das bedeutet, daß die Nutenböden 11 z. B. wie beim System Phillips® einen dreieckförmigen Querschnitt besitzen bzw. konkav dachförmig ausgebildet sind und eine linear verlaufende Firstlinie haben, wie Fig. 2 und 4 zeigen.The profile section 6 includes at a front end of a conventional, conical cross point with four cross-shaped webs 8, which are radial to the longitudinal axis 7. The outer edges of the webs 8 converge toward a tip 9. The back ends the webs 8 go over into the front side of the base portion 5. Between each two adjacent webs 8 are V-shaped recesses or grooves 10 with groove bottoms 11 (FIG. 3), which in a bordering to the tip 9 penetration portion 12, which serves to penetrate the cross point in the corresponding Phillips profile of an associated screw, straight are formed. This means that the groove bottoms 11 z. As in the system Phillips ® have a triangular cross-section or are concave roof-shaped and have a linear ridge line, as shown in FIGS. 2 and 4 show.

An den Eindringabschnitt 12 schließt sich ein zwischen diesem und dem Basisabschnitt 5 angeordneter und das Hinterende des Profilabschnitts 6 bildender Übergangsabschnitt 14 (Fig. 1 und 3) an. In diesem laufen die Nutenböden 11 mit längs und quer gekrümmten Übergangsflächen 15 radial nach außen bis zum Umfangsmantel des Basis- abschnitts 5 aus. Im Ausführungsbeispiel gehen die Übergangsflächen 15 nach außen hin in je einen Flächenabschnitt 16 über, der gemäß Fig. 2 insbesondere quer gewölbt ausgebildet ist. Die entsprechenden Flächenabschnitte 16 aller vier Nuten 10 bilden zugleich die zwischen den Stegen 8 frei bleibenden Teile einer Stirnfläche des angrenzenden Basisabschnitts 5, die jeweils durch die an sie anstoßenden Grundflächen der Stege 8 unterbrochen ist. Wie Fig. 3 zeigt, sind die Flächenabschnitte 16 zur Längsachse 7 unter Winkeln α geneigt, die - gemessen in die Mittelachsen der Flächenabschnitte 16 einschließenden Radialebenen - vorzugsweise zwischen 75° und 85° und mit besonderem Vorteil bei ca. 85° liegen.The penetration section 12 is adjoined by a transition section 14 (FIGS. 1 and 3) arranged between it and the base section 5 and forming the rear end of the profile section 6. In this run the Nutenböden 11 with longitudinally and transversely curved transition surfaces 15 radially outward to the peripheral skirt of the base portion 5 from. In the exemplary embodiment, the transition surfaces 15 go outwardly into a respective surface portion 16, which is formed according to FIG. 2 in particular transversely arched. The corresponding surface portions 16 of all four grooves 10 at the same time form between the webs 8 remaining free parts of an end face of the adjacent base portion 5, which is interrupted in each case by the adjoining them base surfaces of the webs 8. As shown in Fig. 3, the surface portions 16 are inclined to the longitudinal axis 7 at angles α, which - measured in the central axes of the surface portions 16 enclosing radial planes - preferably between 75 ° and 85 ° and with particular advantage at about 85 °.

Weiterhin zeigt vor allem Fig. 3, daß die Nutenböden 11 mittels der Übergangsflächen 15 stetig in die Flächenabschnitte 16 übergehen. Die Übergangsflächen 15 sind vorzugsweise mit Radien von 0,15 mm bis 2,0 mm gekrümmt, wobei Krümmungsradien von 0,5 mm bis 1,5 mm bevorzugt werden. Außerdem ist der Krümmungsradius natürlich in Abhängigkeit von den Größen der Profilspitzen, die durch Normen vorgegeben und bei Schraubwerkzeugen für Kreuzschlitzschrauben in die Größen 00 bis 4 eingeteilt sind, unterschiedlich groß zu wählen bzw. an die Profilspitzen anzupassen. Entsprechendes gilt bei Schraubwerkzeugen für das TORX®-System.Furthermore, Fig. 3 shows, in particular, that the groove bottoms 11 pass continuously into the surface sections 16 by means of the transitional surfaces 15. The transition surfaces 15 are preferably curved with radii of 0.15 mm to 2.0 mm, wherein radii of curvature of 0.5 mm to 1.5 mm are preferred. In addition, the radius of curvature, of course, depending on the sizes of the profile tips, which are specified by standards and divided into screwdrivers for Phillips screws in the sizes 00 to 4, to choose different sizes or adapt to the profile tips. The same applies to screwing tools for the TORX ® system.

Alternativ zu Fig. 1 bis 3 wäre es möglich, die Übergangsflächen 15 und die an sie anschließenden Flächenabschnitte 16 bis zum Erreichen der Mantelfläche des Basisabschnitts 5 radial durchgehend gekrümmt auszubilden (z. B. PCT-WO 01/66312 A1 ), wobei durchweg dieselben, aber auch unterschiedliche Krümmungsradien verwendet werden können, die z. B. im Bereich der Übergangsflächen 15 kleiner als im Bereich der Flächenabschnitte 16 sind.As an alternative to FIGS. 1 to 3, it would be possible to form the transition surfaces 15 and the surface sections 16 adjoining them in a radially continuous manner until they reach the lateral surface of the base section 5 (eg. PCT-WO 01/66312 A1 ), wherein throughout the same, but also different radii of curvature can be used, the z. B. in the region of the transition surfaces 15 are smaller than in the region of the surface portions 16.

Erfindungsgemäß sind die Flächenabschnitte 16 in seitlicher Richtung und auf beiden Seiten durch zweite Übergangsflächen 17a, 17b mit den rückwärtigen Enden seitlicher Flanken 8a der jeweils benachbarten Stege 8 verbunden. Auch die zweiten Übergangsflächen 17a, 17b haben in Querrichtung, ausgehend von den Flanken 8a, vorzugsweise Krümmungsradien von 0,15 mm bis 2,0 mm, mit besonderem Vorteil von 0,4 mm bis 1,5 mm. Die Krümmungsradien vergrößern sich zweckmäßigerweise von einer den Nutenböden 11 nahen Stelle radial nach außen zum Umfangsmantel des Basisabschnitts 5 hin stetig, so daß insgesamt ein dreidimensional gewölbter Auslauf ausgebildet wird. Dabei ist die Anordnung nach Fig. 2 z. B. so gewählt, daß die Flächenabschnitte 16 dreieckförmige, in den Verlängerungen der Nutenböden 11 und der ersten Übergangsflächen 15 liegende Flächen sind, an deren seitlichen, radial verlaufenden Rändern die zweiten Übergangsflächen 17a, 17b beginnen, die dann allmählich tangential in die Stegflanken 8a münden.According to the invention, the surface sections 16 are connected in the lateral direction and on both sides by second transitional surfaces 17a, 17b to the rearward ends of lateral flanks 8a of the respectively adjacent webs 8. Also, the second transitional surfaces 17a, 17b have in the transverse direction, starting from the flanks 8a, preferably radii of curvature of 0.15 mm to 2.0 mm, with particular advantage of 0.4 mm to 1.5 mm. The radii of curvature expediently increase steadily from a location close to the groove bottoms 11 radially outward to the peripheral surface of the base section 5, so that a three-dimensionally curved outlet is formed overall. The arrangement of FIG. 2 z. B. chosen so that the surface portions 16 are triangular, lying in the extensions of the groove bottoms 11 and the first transition surfaces 15 surfaces on the lateral, radially extending edges of the second transitional surfaces 17a, 17b begin, which then gradually tangentially open into the web flanks 8a ,

Die Übergangsflächen 17a, 17b sind, wie in Fig. 2 angedeutet ist, in Querrichtung mit einem einheitlichen Radius gekrümmt. Der jeweilige Radius kann dann auch von der ersten Übergangsfläche 15 aus nach außen gleich sein.The transitional surfaces 17a, 17b are, as indicated in Fig. 2, curved in the transverse direction with a uniform radius. The respective radius can then also be equal to the outside from the first transition surface 15.

Die Krümmungsradien der Übergangsflächen 17a, 17b können sich in Querrichtung aber auch ändern. Dies ist im Ausführungsbeispiel nach Fig. 4 dadurch angedeutet, daß die Übergangsflächen 17a, 17b aus Teilflächen 17a1, 17a2 bzw. 17b1, 17b2 zusammengesetzt sind, wobei die Teilfächen 17a1, 17b1 an den Stegflanken 8a beginnen und größere Krümmungsradien als die sich an sie anschließenden Teilflächen 17a2, 17b2 aufweisen, die hier zu einem eben dargestellten Flächenabschnitt 16' hin auslaufen. Im übrigen entspricht das Ausführungsbeispiel nach Fig. 4 dem nach Fig. 1 bis 3, weshalb gleiche Teile mit denselben Bezugszeichen versehen sind.The radii of curvature of the transition surfaces 17a, 17b may also change in the transverse direction. This is indicated in the exemplary embodiment according to FIG. 4 in that the transitional surfaces 17a, 17b are composed of partial surfaces 17a1, 17a2 and 17b1, 17b2, the partial surfaces 17a1, 17b1 starting at the web flanks 8a and having larger radii of curvature than those adjoining them Partial surfaces 17a2, 17b2 have, here to a planar surface portion 16 'shown out leak. Otherwise, the embodiment of FIG. 4 corresponds to that of FIG. 1 to 3, which is why the same parts are provided with the same reference numerals.

Die in Fig. 1 bis 3 gerundet dargestellten Nutenböden 11 können auch anders geformt sein. Anstelle eines dachförmigen Querschnitts könnten andere und insbesondere solche Querschnitte vorgesehen sein, wie sie bei Schrauben der verschiedenen Systeme allgemein üblich sind.The groove bottoms 11 shown rounded in FIGS. 1 to 3 can also be shaped differently. Instead of a roof-shaped cross section, other and in particular such cross sections could be provided, as are common in the case of screws of the various systems.

Die Längenmaße der verschiedenen Teile bzw. Abschnitte entsprechen vorzugsweise im wesentlichen denen, die aus der Schrift PCT-WO 01/66 312 A1 bekannt sind. Insbesondere die Verhältnisse der Längen LP der Profilabschnitte 6 zu den Längen L0 der Eindringabschnitte 12 sind vorzugsweise kleiner als 1,5 und betragen vorzugsweise 1,25 bis 1,85. In absoluten Werten beträgt z. B. die Länge L0 des Eindringabschnitts 12 zwischen 1,50 mm und 4,00 mm je nach Größe und Schraubensystem. Der Durchmesser d0 (Fig. 1 und 3) des Eindringabschnitts 12 beträgt im Abstand L0 von der Spitze 9 zwischen 2,3 mm und 8,0 mm.The length dimensions of the various parts or sections preferably correspond substantially to those of the document PCT WO 01/66312 A1 are known. In particular, the ratios of the lengths LP of the profile sections 6 to the lengths L0 of the penetration sections 12 are preferably less than 1.5 and are preferably 1.25 to 1.85. In absolute terms, z. As the length L0 of the penetration portion 12 between 1.50 mm and 4.00 mm, depending on the size and screw system. The diameter d0 (FIGS. 1 and 3) of the penetration section 12 is between 2.3 mm and 8.0 mm at a distance L0 from the tip 9.

Das Maß L0 ist im Rahmen der vorliegenden Anmeldung mindestens gleich der größten Tiefe des Innenprofils in einem Schraubenkopf bestimmter Profilgröße, z. B. Pozidriv® 2. Zweckmäßigerweise wird für L0 ein Maß gewählt, das sich aus der größten Eindringtiefe zuzüglich eines geringen Zuschlages ergibt. Das Maß LP ist im Rahmen der vorliegenden Anmeldung das Maß von der Spitze 9 des Vorderteils 4 bis zum Auslauf des Übergangsabschnitts 14 in den Basisabschnitt 5, wobei als Grenze dieses Auslaufes die Verschneidungslinie der Flächenabschnitte 16 mit der Umfangsfläche des Basisabschnitts 5 definiert wird. Beide Maße werden von der Spitze 9 des Vorderteils 4 ausgehend gemessen, und zwar von der Kante aus, an der eine eventuelle flachkegelig geformte Spitzenfläche in die seitliche Profilkontur übergeht, oder von der Spitzenfläche selbst aus, wenn sie eine Planfläche darstellt, die senkrecht zur Längsachse 7 des Vorderteiles 4 steht. Der Basisabschnitt 5 kann eine zylindrische, sechseckige oder anders geformte Querschnittskontur haben.The dimension L0 is in the context of the present application at least equal to the greatest depth of the inner profile in a screw head certain profile size, z. B. Pozidriv ® 2. Conveniently, a measure is selected for L0, resulting from the largest penetration depth plus a small surcharge. The dimension LP is in the context of the present application, the measure of the tip 9 of the front part 4 to the outlet of the transition section 14 in the base portion 5, wherein the boundary of this outlet, the intersection line of the surface portions 16 with the peripheral surface of the base portion 5 is defined. Both dimensions are measured starting from the tip 9 of the front part 4, from the edge at which any flat conically shaped tip surface merges into the lateral profile contour, or from the tip surface itself, when it represents a plane surface perpendicular to the longitudinal axis 7 of the front part 4 is. The base portion 5 may have a cylindrical, hexagonal or other shaped cross-sectional contour.

Durch die angegebene Formgebung des Übergangsabschnitts 14 zwischen dem Eindringabschnitt 12 und Basisabschnitt 5, d. h. die Kombination von kleinen Radien und gewölbten Flächen, wird ein guter Kraftfluß erreicht und dadurch die Bruchfestigkeit bei Torsionsbelastung der Spitze weiter erhöht.By the specified shape of the transition section 14 between the penetration portion 12 and base portion 5, d. H. the combination of small radii and curved surfaces, a good power flow is achieved, thereby further increasing the breaking strength under torsional load of the tip.

Fig. 5 und 6 betreffen ein Ausführungsbeispiel für ein Schraubwerkzeug in Form eines Schraubendreher-Einsatzes für das Pozidriv®-System. Dieses unterscheidet sich von den für das Phillips®-System nach Fig. 1 bis 4 bestimmten Ausführungsbeispielen einerseits durch Stege 19 mit nahezu planparallel angeordneten Flanken 19a, während die Flanken 8a der Stege 8 gemäß Fig. 4 leicht keilförmig auseinander laufen. Andererseits sind Böden 20 von V-förmigen Nuten 21 in ihren mittleren Bereichen mit kammartigen Erhebungen 22 versehen, die dreieckförmige Querschnitte aufweisen. In Analogie dazu können auch die Flächenabschnitte 16 in ihren mittleren Bereichen mit je einer kammartigen, radial verlaufenden Erhebung 23 versehen sein, wie Fig. 5 zeigt. Beim Ausführungsbeispiel nach Fig. 6 fehlen diese Erhebungen 23. Außerdem sind dort die Flächenabschnitte 16 durch Flächenabschnitte 24 ersetzt, die in der Ansicht nach Fig. 6 konkav gewölbt sind und die Übergangsflächen 17a, 17b stetig miteinander verbinden. In diesem Fall ist die Stirnfläche des Basisabschnitts 5 daher von den konkaven Flächenabschnitten 24 gebildet.FIGS. 5 and 6 relate to an embodiment of a screwing tool in the form of a screwdriver bit for Pozidriv ® system. This differs from the ® for the Phillips system according to Fig. 1 to 4 certain embodiments the one hand, by webs 19 having nearly flat parallel edges 19a, while the flanks easily run in a wedge shape apart 8a of the ridges 8 in Fig. 4. On the other hand, bottoms 20 of V-shaped grooves 21 are provided in their central regions with comb-like elevations 22 having triangular cross-sections. In analogy, the surface portions 16 may be provided in their middle regions, each with a comb-like, radially extending elevation 23, as Fig. 5 shows. In addition, the surface portions 16 are replaced by surface portions 24, which are concave in the view of FIG. 6 and the transition surfaces 17 a, 17 b continuously connect with each other. In this case, therefore, the end surface of the base portion 5 is formed by the concave surface portions 24.

Im übrigen sind in Fig. 5 und 6 gleiche Teile mit denselben Bezugszeichen wie in Fig. 1 bis 4 versehen.Incidentally, in Fig. 5 and 6, the same parts with the same reference numerals as in Fig. 1 to 4 are provided.

Fig. 7 und 8 zeigen ein im wesentlichen den Fig. 1 bis 4 entsprechendes Ausführungsbeispiel, weshalb hier gleiche Teile wiederum mit denselben Bezugszeichen versehen sind. Ein wesentlicher Unterschied besteht jedoch darin, daß der Eindringabschnitt 12 im Vergleich zu Fig. 1 bis 4 um ein Maß K verkürzt ist, wobei vorzugsweise K = 0,05 · L0 bis K = 0,2 · L0 gilt. Das bedeutet, daß die Längen L0, ermittelt nach den maximalen Eindringtiefen T (Fig. 8) in entsprechenden Innenprofilen 40 von Schraubenköpfen 41 zugeordneter Größen und Typen, um ca. 5 % bis 20 % im Vergleich zu üblichen, nach Fig. 1 bis 4 hergestellten Schraubendreher-Einsätzen verkürzt werden. In Fig. 7 und 8 ist das aufgrund der Kürzung wegfallende Teil 42 des Eindringabschnitts 12 mit gepunkteten Linien angedeutet.Figs. 7 and 8 show an embodiment substantially corresponding to Figs. 1 to 4, which is why the same parts are again provided with the same reference numerals. An essential difference, however, is that the penetration portion 12 is shortened compared to Fig. 1 to 4 by a measure K , wherein preferably K = 0.05 · L0 to K = 0.2 · L0 applies. This means that the lengths L0, determined according to the maximum penetration depths T (FIG. 8) in corresponding inner profiles 40 of screw heads 41 of assigned sizes and types, are approximately 5% to 20% compared to the usual one, according to FIGS manufactured screwdriver inserts be shortened. In FIGS. 7 and 8, the portion 42 of the penetrating portion 12 due to the shortening is indicated by dotted lines.

Ein vorteilhafter Bereich der Kürzung K liegt zwischen 7 % und 12 % der Länge L0. Bei einer Kürzung um 10 % ergeben sich beispielweise folgende Maße L0K für die verkürzte Länge:An advantageous range of the cut K is between 7% and 12% of the length L0. For example, a reduction of 10% results in the following measures L0K for the shortened length:

Bei Kreuzschrauben PZ (Z) 2 EN-ISO 7045-7047 ist die maximale Eindringtiefe 3,35 mm, dementsprechend ist L0K z. B. gleich 0,9 · 3,35 = 3,01 mm. Analog gilt für PZ (Z) 1 eine maximale Eindringtiefe von 2,08 mm, dementsprechend ist L0K gleich 0,9 · 2,08 = 1,87 mm. Für PZ (Z) 3 beträgt die maximale Eindringtiefe 3,85 mm, dementsprechend ist L0K z. B. gleich 0,9 · 3,85 = 3,47 mm. Für PH (H) 1 beträgt die maximale Eindringtiefe 2,20 mm, dementsprechend ist L0K z. B. gleich 0,9 · 2,20 = 1,98 mm. Schließlich beträgt für PH (H) 2 die maximale Eindringtiefe 3,40 mm, weshalb L0K z. B. zu 0,9 · 3,40 = 3,06 mm bestimmt wird.For Phillips screws PZ (Z) 2 EN-ISO 7045-7047 the maximum penetration depth is 3.35 mm, therefore L0K is approx. B. equal to 0.9 x 3.35 = 3.01 mm. Analogously, for PZ (Z) 1, a maximum penetration depth of 2.08 mm applies, accordingly L0K is equal to 0.9 · 2.08 = 1.87 mm. For PZ (Z) 3, the maximum penetration depth is 3.85 mm, accordingly L0K z. B. equal to 0.9 x 3.85 = 3.47 mm. For PH (H) 1, the maximum penetration depth is 2.20 mm, accordingly L0K z. B. equal to 0.9 · 2.20 = 1.98 mm. Finally, for PH (H) 2, the maximum penetration depth is 3.40 mm, which is why L0K z. B. to 0.9 · 3.40 = 3.06 mm is determined.

Um mit Sicherheit zu vermeiden, daß der Eindringabschnitt 12 an der Übergangsfläche 15 auf der Oberfläche des Schraubenkopfes 41 aufsitzt, wird außerdem vorgeschlagen, die Ausgangslänge L0 des Eindringabschnittes 12 ca. 3 bis 5 % länger zu wählen, als die jeweilige maximale Eindringtiefe T. Dadurch wird sich die Profilkontur außerhalb des Schraubenkopfes 41 noch etwas fortsetzen.In order to avoid with certainty that the penetration section 12 is seated on the transition surface 15 on the surface of the screw head 41, it is also proposed to choose the initial length L0 of the penetration section 12 about 3 to 5% longer than the respective maximum penetration depth T. As a result, the profile contour outside the screw head 41 will continue somewhat.

Die Profilkontur selbst ist durch die ISO- und Werksnormen, ausgehend von der Profilspitze, festgelegt. Die Verkürzung der Maße L0 und L0K hat natürlich auch eine entsprechende Verkürzung der Maße LP auf LPK zur Folge, wobei die Konturen der Übergangsflächen 15 und Flächenabschnitte 16 wie bei ungekürztem L0 unverändert auch bei verkürztem L0K erhalten bleiben.The profile contour itself is determined by the ISO and factory standards, starting from the profile tip. The shortening of the dimensions L0 and L0K naturally also results in a corresponding shortening of the dimensions LP to LPK, whereby the contours of the transitional surfaces 15 and surface sections 16 remain unchanged, even with a shortened L0K, as with uncut L0.

Die Verkürzung des Eindringabschnitts 12 um das Maß K wirkt sich wegen der Formgebung aus Hartmetallpulver (z. B. nach PCT-WO 01/66312 A1 ) insbesondere bei Einsätzen mit Kreuzschlitzprofilen vorteilhaft aus. Diese Maßnahme hat nämlich einerseits zur Folge, daß beim axialen Ausstoßen des Vorderteils 4 aus der Formmatrize die Reibung infolge der kleineren Gesamtoberfläche geringer wird. Andereseits führt die Verkürzung an der Spitze des Eindringabschnittes 12 - zumindest bei konischen Kreuzspitzen - zu einer Vergrößerung der Querschnittsfläche einer Spitze 43, damit zu einer geringeren Flächenpressung beim Ausstoßen und dadurch zur Verringerung der Gefahr der Bildung von Haarrissen. Weiterhin hat sich gezeigt, daß an den Spitzen der Hartmetall-Rohlinge beim Entformen leicht Formveränderungen auftreten können, die die Paßgenauigkeit im Innenprofil 40 des Schraubenkopfs 41 beeinträchtigen. Derartige Ungenauigkeiten können dazu führen, daß der Eindringabschnitt 12 nur im vorderen Bereich im Innenprofil 40 des Schraubenkopfs 41 anliegt, statt vollflächig in ganzer Länge anzuliegen. Dieses Problem wird durch die Kürzung des Eindringabschnitts 12 in vorteilhafter Weise automatisch ebenfalls vermieden. Wie Fig. 8 zeigt, taucht der Eindringabschnitt 12 nicht so weit in das Innenprofil 40 des Schraubenkopfs 41 ein, daß die Spitze an einer möglichen Verengung 44 (Fig. 8) aufsitzt, sondern nur so weit, bis das Profil des Eindringabschnittes 12 vollflächig im Innenprofil 40 des Schraubenkopfs 41 anliegt. Das bei normaler Länge vorhandene, gepunktet dargestellte Teil 42 würde dagegen, wenn es nicht präzise ausgebildet wäre, an der Verengung 44 aufsitzen und damit eine vollflächige Anlage verhindern. Solche Verengungen 44 können auftreten, wenn die Preßstempel für das Innenprofil der Schrauben an der Spitze abgenutzt sind.The shortening of the penetration section 12 by the dimension K has an effect due to the shaping of cemented carbide powder (eg after PCT-WO 01/66312 A1 ) in particular advantageous in applications with cross-slot profiles. This measure has namely on the one hand the consequence that the axial ejection of the front part 4 from the forming die, the friction due to the smaller total surface area is lower. On the other hand, the shortening at the tip of the penetration section 12 - at least in the case of conical cross tips - leads to an enlargement of the cross-sectional area of a tip 43, thus to a lower surface pressure during ejection and thereby to a reduction in the risk of the formation of hairline cracks. Furthermore, it has been shown that slight deformations may occur at the tips of the carbide blanks during demolding, affecting the accuracy of fit in the inner profile 40 of the screw head 41. Such inaccuracies can cause the penetration portion 12 rests only in the front region in the inner profile 40 of the screw head 41, instead of over the entire surface to lie in full length. This problem is automatically avoided by the reduction of the Eindringabschnitts 12 advantageously also. As FIG. 8 shows, the penetration section 12 does not dip so far into the inner profile 40 of the screw head 41 that the tip is seated on a possible constriction 44 (FIG. 8), but only so far until the profile of the penetration section 12 has a full surface Inner profile 40 of the screw head 41 rests. The present at normal length, dotted portion 42, however, would, if it were not precisely formed, sit on the constriction 44, thus preventing a full-surface investment. Such constrictions 44 may occur when the punches for the inner profile of the screws on the tip are worn.

Das Verhältnis der Länge LPK des gekürzten Profilabschnitts zur Länge L0 des entsprechend gekürzten Eindringabschnittes 12 beträgt bei dieser Ausführungsform 1,20 bis 1,90 und ist vorzugsweise größer als 1,5.The ratio of the length LPK of the shortened profile section to the length L0 of the correspondingly shortened penetration section 12 in this embodiment is 1.20 to 1.90 and is preferably greater than 1.5.

Versuche mit Hartmetall-Einsätzen der beschriebenen Art haben weiter gezeigt, daß an den Außenkanten der Stege, die sich an der Verschneidung der Flankenflächen mit der äußeren Kegelmantelfläche des Eindringabschnittes ergeben, leicht Haarrisse auftreten. Dies wird darauf zurückgeführt, daß die sich aus der Verschneidung ergebenden Kanten scharfkantig sind. Bei einer Fertigung der Profilspitzen aus Stahl durch spanende oder spanlose Formgebung macht sich diese Scharfkantigkeit nicht bemerkbar, d. h. sie ist dort nicht nachteilig. Beim Pressen der Rohlinge aus Metallpulver wird dagegen eine glatte Ausformung der Außenkanten nicht zuverlässig erreicht. Vielmehr können insbesondere beim Entformen kleinere Ausbrüche auftreten, die Ansätze für Haarrisse bilden. Diese Erscheinung tritt auch beim Spritzgießen der Rohlinge auf.Experiments with carbide inserts of the type described have further shown that hairline cracks easily occur at the outer edges of the webs, resulting from the intersection of the flank surfaces with the outer conical surface of the Eindringabschnittes. This is attributed to the fact that the edges resulting from the intersection are sharp-edged. When manufacturing the profile tips made of steel by machining or non-cutting shaping, this sharp edge does not become noticeable. ie it is not disadvantageous there. When pressing the blanks of metal powder, however, a smooth formation of the outer edges is not reliably achieved. Rather, especially when demolding smaller outbreaks occur that form approaches for hairline cracks. This phenomenon also occurs during injection molding of the blanks.

Erfindungsgemäß werden daher beim Ausführungsbeispiel nach Fig. 9, das einen Querschnitt durch eine für Kreuzschlitzschrauben des Pozidriv®-Systems bestimmte Profilspitze zeigt, an den radialen Außenkanten der im übrigen wie in Fig. 5 ausgebildeten Stege 8 entweder Abrundungen 45 oder Abschrägungen 46 vorgesehen. Der Radius r der Abrundungen beträgt ca. 10 % bis 12 % der Stärke b der Stege 8. Die Stärke b ist beim System Pozidriv® über die Länge L0 des Profils konstant, weshalb der Radius der Abrundungen 45 im wesentlichen auch konstant gewählt werden kann. Beim System Phillips® wird die Stärke b von der Spitze 9 her zur Übergangsfläche 15 hin größer, weshalb der Radius r von der Spitze bis zur Übergangsfläche 15 hin etwas größer werden kann. Er kann aber auch konstant sein und entsprechend einer mittleren Stärke der Stege 8 auf ihrer Längserstreckung gewählt werden. Die Breite a der Abschrägungen 46 wird vorzugsweise in einem Verhältnis von 6 % bis 10 % zur Stärke b der Stege 8 gewählt.Therefore, According to the invention in the embodiment of Fig. 9 which shows a cross section through a particular for cross-slotted screws Pozidriv ® system profile tip, on the radial outer edges of the 5 formed in the other as shown in Fig. Webs either rounding 45 or bevels 46 8 is provided. The radius r of the rounding is about 10% to 12% of the thickness b of the webs 8. The thickness b is constant in the system Pozidriv ® over the length L0 of the profile, which is why the radius of the fillets 45 can be selected substantially constant. In the system Phillips ® starch is b greater toward the tip 9 forth to the junction surface 15, and therefore the radius r of the tip to the transition surface 15 can be down somewhat larger. But it can also be constant and be chosen according to a mean thickness of the webs 8 on their longitudinal extent. The width a of the bevels 46 is preferably selected in a ratio of 6% to 10% to the thickness b of the webs 8.

Wie Versuche mit Hartmetall-Einsätzen weiter zeigten, ergibt sich insbesondere bei Pozidriv®-Profilen (PZ, Z) eine Erschwernis für das Entformen dadurch, daß die beim Eindrehen von Schrauben zur Anlage kommenden Flanken der Kreuzstege 8 in Richtung der Längsachse 7 des Vorderteils 4 nahezu achsparallel verlaufen, also keine Entformungsschräge aufweisen. Zur Erleichterung der Entformung ist deshalb erfindungsgemäß vorgesehen, diese Flanken im vorderen Bereich auf etwa ein Drittel ihrer Länge unter einem Winkel von ca. 2,5° bis 5° konisch bis zur Spitze 9 hin anzuschrägen. Dadurch wird zwar der drehmonentübertragende Querschnitt verringert und auch keine vollflächige Anlage im Innenprofil der Schraube mehr erreicht, jedoch taucht selbst bei den kleinsten Schrauben, die einer Kreuzschlitzgröße zugeordnet sind, die Profilspitze tiefer in das Innenprofil der Schraube ein, als der Länge der Anschrägung entspricht, so daß die Profilspitze auch im hinteren Teil zur flächigen Anlage kommt, wo das Drehmoment auf Grund des größeren Hebels bzw. der radialen Erstreckung der Flanke hauptsächlich übertragen wird.As experiments with carbide inserts further showed, especially for Pozidriv ® -Profilen (PZ, Z) is an impediment to removal from the fact that the coming into the screw when screwing flanks of the cross webs 8 in the direction of the longitudinal axis 7 of the front part. 4 run almost parallel to the axis, so have no Entformungsschräge. To facilitate removal from the mold, it is therefore provided according to the invention that these flanks taper in the front region to approximately one third of their length at an angle of approximately 2.5 ° to 5 ° conically up to the tip 9. As a result, although the drehmonentübertragende cross section is reduced and no full-surface investment in the inner profile of the screw longer achieved, however, even with the smallest screws, which are associated with a Phillips size, the profile tip deeper into the inner profile of the screw, as the length of the bevel corresponds, so that the profile tip also comes in the rear part for surface contact, where the torque is mainly transmitted due to the larger lever or the radial extent of the flank.

Fig. 10 zeigt eine solche Variante anhand eines entsprechend Fig. 1 ausgebildeten, im Bereich der Profilspitze vergrößert dargestellten Schraubwerkzeugs, bei dem gleiche Teile mit denselben Bezugszeichen wie in Fig. 1 versehen sind.FIG. 10 shows such a variant on the basis of a screwing tool designed in accordance with FIG. 1 and enlarged in the region of the profile tip, wherein the same parts are provided with the same reference numerals as in FIG. 1.

In Fig. 10 ist das Vorderteil 4 des Schraubendreher-Einsatzes mit einer Profilspitze des Systems Pozidriv® dargestellt. Bei diesem System verlaufen die Seitenflanken 8a der Stege 8 auf ihrer Längserstreckung im wesentlichen parallel. Um die Entformung der Stege 8 aus der Preß- und Spritzgießform zu erleichtern, ist jeweils eine Flanke der vier kreuzförmig angeordneten Stege 8 im vorderen Bereich etwas angeschrägt. Der Winkel einer dadurch gebildeten Entformungsschräge liegt zwischen 1° und 5° bezogen auf eine Radialebene, die die Längsachse 7 und eine gedachte Mittelebene der Stege 8 einschließt. Zweckmäßigerweise erfolgt die Anbringung einer die Entformungsschräge bildenden Anschrägung 47 an derjenigen Flanke, die beim Ausdrehen von Schrauben belastet wird und in Fig. 10 mit 8b bezeichnet ist, weil diese Seite in der Regel weniger oft oder geringer belastet wird als andere Flanken, die beim Eindrehen von Schrauben zur Anlage im Innenprofil der Schraube kommen. Um die Entformbarkeit weiter zu erleichtern, werden zweckmäßig aber auch die anderen Flanken aller vier Stege 8 leicht angeschrägt. Dabei werden die Anschrägungen 47 zweckmäßigerweise mit einem kleinen Winkel von ca. 1° bis 2° vorgenommen, jedoch über die ganze Länge der Flanke erstreckt. Trotz dieser leichten Anschrägung 47 ist noch eine relativ gute Anlage der Flanken 8b bzw. 8a im Innenprofil der Schraube gegeben. Beide Anschrägungen 47 gehen von der größten in den Normen vorgegebenen Stärke des Eindringabschnittes 12 aus.In Fig. 10, the front part 4 of the screwdriver insert is shown with a profile tip of the system Pozidriv ® . In this system, the side edges 8a of the webs 8 extend substantially parallel on their longitudinal extension. In order to facilitate the demolding of the webs 8 from the pressing and injection mold, one edge of each of the four cross-shaped webs 8 is slightly bevelled in the front region. The angle of a demolding slope formed thereby lies between 1 ° and 5 ° with respect to a radial plane which encloses the longitudinal axis 7 and an imaginary center plane of the webs 8. Conveniently, the attachment of a bevel 47 forming the Entformungsschräge takes place at that edge which is loaded when unscrewing screws and is designated in Fig. 10 with 8b, because this page is usually less often or less burdened than other flanks, which when screwing of screws come to rest in the internal profile of the screw. In order to further facilitate demolding, but the other edges of all four webs 8 are expediently bevelled slightly. The chamfers 47 are expediently made with a small angle of about 1 ° to 2 °, but extends over the entire length of the flank. Despite this slight bevel 47 is still a relatively good investment of the flanks 8b and 8a in the inner profile of the screw given. Both chamfers 47 are based on the largest specified in the standards strength of the penetration portion 12.

Weitere Untersuchungen haben schließlich gezeigt, daß der Materialfluß beim Füllen der Preßmatrize oder Spritzgießform auch dadurch verbessert werden kann, daß in einem radial außen liegenden Bereich der die Stirnfläche des Basisabschnitts 5 bildenden, auslaufenden Flächenabschnitte 16 jeweils eine vorzugsweise sattelförmige (konkave) Ausnehmung 49 angebracht wird. Derartige Ausnehmungen 49 sind in Fig. 11 und 12 schematisch dargestellt, die im übrigen den Fig. 2 und 3 entsprechen. Die Ausnehmungen 49 können auch als ebene, in die Flächenabschnitte 16 eingearbeitete Flächen realisiert sein. Durch diese Ausnehmungen 49 wird insbesondere die trichterartige Form des geschnittenen Kerns (Fig. 12) verbessert. Wie ein Vergleich der Fig. 12 mit der Fig. 3 zeigt, bei der sich der Flächenabschnitt 16 mit einem kleinen Winkel im wesentlichen radial erstreckt, wird nämlich die Befüllung der Profilspitze beim Verformen des Rohlings durch Pressen oder Spritzgießen begünstigt, weil der Massestrom besser in die Profiltaschen in der Matrize geleitet wird. In der dreidimensionalen Darstellung der Profilspitze in Fig. 11 sind die Flächen 49 noch besser zu erkennen. Ihre konkave Wölbung in Umfangsrichtung leitet den Massestrom auch nach der Seite zu den Profiltaschen in der Matrize. Über die gerundeten, zweiten Übergangsflächen 17a, 17b werden die auf die Stege 8 wirkenden Torsionskräfte in den Basisabschnitt 5 geleitet. Dabei sollte allerdings die Wirkung der zweiten Übergangsflächen 17a, 17b, deren Radien von den Nutenböden 11 nach außen hin größer werden, nicht gestört werden. Daher sind die Ausnehmungen 49 zweckmäßig nur im radial äußeren Bereich angeordnet und in Umfangsrichtung nur über einen solchen Bereich erstreckt, daß sie seitlich vor den zweiten Übergangsflächen 17a, 17b enden. Dadurch bleiben die durch diese gebildeten, gewölbten Übergangszonen erhalten, mittels derer die bei Belastung der Stege 8 auftretenden Spannungen klein gehalten werden. Insgesamt läßt sich mit den Ausnehmungen 49 eine sehr dichte, homogene Füllung der Taschen des Formwerkzeugs beim Pressen oder Spritzgießen der Rohlinge erreichen.Further investigations have finally shown that the material flow during filling of the press die or injection mold can also be improved by the fact that in a radially outer region of the end face of the base portion. 5 forming, expiring surface portions 16 each have a preferably saddle-shaped (concave) recess 49 is attached. Such recesses 49 are shown schematically in FIGS. 11 and 12, which otherwise correspond to FIGS. 2 and 3. The recesses 49 can also be realized as planar, incorporated in the surface portions 16 surfaces. In particular, the funnel-like shape of the cut core (FIG. 12) is improved by these recesses 49. As a comparison of Fig. 12 with Fig. 3 shows, in which the surface portion 16 extends at a small angle substantially radially, namely the filling of the tread tip is favored during deformation of the blank by pressing or injection molding, because the mass flow better in the profile pockets are routed in the matrix. In the three-dimensional representation of the profile tip in Fig. 11, the surfaces 49 are even better visible. Their concave curvature in the circumferential direction directs the mass flow also to the side to the profile pockets in the die. The torsional forces acting on the webs 8 are guided into the base section 5 via the rounded, second transition surfaces 17a, 17b. In this case, however, the effect of the second transitional surfaces 17a, 17b, whose radii are larger from the Nutenböden 11 to the outside, should not be disturbed. Therefore, the recesses 49 are expediently arranged only in the radially outer region and extending in the circumferential direction only over such a region that they end laterally in front of the second transitional surfaces 17a, 17b. As a result, the vaulted transition zones formed by these obtained, by means of which the stresses occurring under load of the webs 8 are kept small. Overall, a very dense, homogeneous filling of the pockets of the mold during pressing or injection molding of the blanks can be achieved with the recesses 49.

Der Winkel, den die Ausnehmungen bzw. Flächen 49 mit der Längsachse 7 in einer diese enthaltenden und durch die Fläche 49 gelegten Radialebenen einschließen, sollte deutlich kleiner als der Winkel α (Fig. 12) sein und ist zweckmäßig kleiner als 85°. Dabei zeigt außerdem insbesondere Fig. 12, daß das Maß LP durch die Ausbildung der Ausnehmung 49 vergrößert wird, so daß das Verhältnis LP zu LO beim Vorhandensein der Ausnehmungen 49 größer als beim Fehlen dieser Ausnehmungen 49 ausfällt. Insbesondere bei diesem Ausführungsbeispiel werden daher auch mit Verhältnissen LP/L0 > 1,5 gute Ergebnisse erzielt.The angle formed by the recesses or surfaces 49 with the longitudinal axis 7 in a radial plane containing them and defined by the surface 49 should be significantly smaller than the angle α (FIG. 12) and is expediently less than 85 °. It also shows in particular Fig. 12, that the dimension LP is increased by the formation of the recess 49, so that the ratio LP to LO in the presence of the recesses 49 is greater than in the absence of these recesses 49 fails. In particular, in this embodiment, therefore good results are achieved even with ratios LP / L0> 1.5.

Die erfindungsgemäße Gestaltung des Profilabschnittes 6 bzw. 29, 30 bringt Vorteile nicht nur für Vorderteile aus Hartmetall, die durch Pressen aus Metallpulver vorgeformt sind, sondern auch für solche, die im Spritzgießverfahren vorgeformt sind. Das gilt auch für Schraubendreher-Einsätze, bei denen das Vorderteil 4, 26 Bestandteil eines einstückigen Körpers ist, dessen Rohling vorzugsweise im Spritzgießverfahren vorgeformt ist. Außerdem gilt dies entsprechend auch für aus Hartmetall hergestellte, die erfindungsgemäßen Profilabschnitte 6 bzw. 29, 30 aufweisende Vorderteile, die an ihren Rückseiten, z. B. mit Hilfe geeigneter Verankerungselemente, an den im übrigen aus Stahl bestehenden Schäften der Klingen von Handschraubendrehern befestigt werden.The inventive design of the profile section 6 or 29, 30 brings benefits not only for front parts of hard metal, which are preformed by pressing metal powder, but also for those that are preformed by injection molding. This also applies to screwdriver inserts, in which the front part 4, 26 is part of a one-piece body, the blank is preferably preformed by injection molding. In addition, this also applies accordingly for made of hard metal, the profile sections 6 and 29, 30 according to the invention having front parts, which at their backs, z. B. by means of suitable anchoring elements, are attached to the remaining steel existing shafts of blades of hand screwdrivers.

Die Erfindung ist nicht auf die beschriebenen Ausführungsbeispiele beschränkt, die auf vielfache Weise abgewandelt werden können. So können die Krümmungsradien der Übergangsflächen auch im wesentlichen gleich sein. Außerdem kann es Fälle geben, in denen es ausreichend ist, die auslaufenden Flächenabschnitte 16, 37 in eine senkrecht zur Längsachse 7, 33 verlaufende Ebene zu verlegen, insbesondere wenn die Radien für die Übergangsflächen 17a, 17b so groß bemessen werden, daß allein durch sie ausreichend niedrige Spannungen in den Übergangsbereichen erhalten werden. Weiter können die Übergangsflächen 17a, 17b und/oder die Flächenabschnitte 16, 37 auch aus in Umfangsrichtung oder in radialer Richtung nebeneinander liegenden, unterschiedliche Krümmungsradien aufweisenden Flächen zusammengesetzt sein. Dasselbe gilt für die ersten Übergangsflächen 15 bzw. 36. Außerdem können die beschriebenen Schraubwerkzeuge auch aus anderen Metallpulvern als den beschriebenen Hartmetallpulvern hergestellt werden. Insbesondere sind für die Zwecke der Erfindung z. B. auch solche Pulvermischungen geeignet, die zu Schraubwerkzeugen aus Schnellstahl führen. Die im Einzelfall zu wählende Metallpulver-Zusammensetzung oder -Legierung hängt weitgehend von den Bedürfnissen des Einzelfalls ab. Schließlich versteht sich, daß die verschiedenen Merkmale auch in anderen als den beschriebenen und dargestellten Kombinationen angewendet werden können.The invention is not limited to the described embodiments, which can be modified in many ways. Thus, the radii of curvature of the transition surfaces may also be substantially the same. In addition, there may be cases in which it is sufficient to lay the outgoing surface portions 16, 37 in a direction perpendicular to the longitudinal axis 7, 33 extending plane, especially if the radii for the transitional surfaces 17 a, 17 b are sized so large that only through them sufficiently low voltages are obtained in the transition areas. Furthermore, the transitional surfaces 17a, 17b and / or the surface sections 16, 37 may also be composed of surfaces which lie next to one another in the circumferential direction or in the radial direction and have different radii of curvature. The same applies to the first transition surfaces 15 and 36. In addition, the screwing tools described can also be made of metal powders other than the described hard metal powders. In particular, for the purposes of the invention z. B. also suitable those powder mixtures that lead to screwing tools made of high speed steel. The individual metal powder composition or alloy to be chosen depends largely on the needs of the individual case. Finally, it should be understood that the various features may be applied in combinations other than those described and illustrated.

Claims (32)

  1. Contoured front part (4) produced by shaping and subsequently sintering a metal powder for a screw driving tool, including a base section (5) having a face, and a profile section (6) with a penetration section (12), and a transition section (14) arranged between this and the base section (5), wherein the penetration section (12) has webs (8, 19) provided with lateral flanks (8a, 19a) and grooves (10, 11) arranged between these provided with rectilinear bases (11, 20), and the transition section (14) has radially extending surface sections (16, 16', 24) forming the face of the base section (5) and also first arched transition surfaces (15), which connect the groove bases (11, 20) in radial direction to the surface sections (16, 16', 24), characterised in that the transition section (14) contains second, likewise arched transition surfaces (17a, 17b), which connect the surface sections (16, 16', 24) in lateral direction to the web flanks (8a, 19a).
  2. Front part according to Claim 1, characterised in that the second transition surfaces (17a, 17b) open tangentially into the web flanks (8a, 19a).
  3. Front part according to one of Claims 1 or 2, characterised in that the first and second transition surfaces (15; 17a, 17b) are curved with radii from 0.15 mm to 2.0 mm.
  4. Front part according to one of Claims 1 to 3, characterised in that the transition surfaces (15, 17a, 17b) are formed by part-surfaces (17a1, 17a2; 17b1, 17b2) extending radially or laterally next to one another and having different radii of curvature.
  5. Front part according to one of Claims 1 to 4, characterised in that the surface sections (16, 16', 24) extend radially as far as a peripheral shell of the base section (5).
  6. Front part according to one of Claims 1 to 5, characterised in that the surface sections (16, 24) are spatially arched in lateral direction, wherein the radii of curvature increase from the first transition surfaces (15) towards the peripheral shell of the base section (5).
  7. Front part according to Claim 6, characterised in that the surface sections (24) have a deepest zone formed by the arching with an apex line, which adjoins the respective first transition surface (15) in radial direction and runs substantially in a radial plane, which encloses a longitudinal axis (7) of the front part (14) and a central axis of the associated groove base (11).
  8. Front part according to one of Claims 1 to 5, characterised in that the surface sections (16') are plane.
  9. Front part according to one of Claims 1 to 5, characterised in that the surface sections (16, 16') run on an incline to a longitudinal axis (7) of the front part (4).
  10. Front part according to one of Claims 1 to 9, characterised in that the surface sections are interrupted by comb-like raised sections (23), the backs of which run in a radial plane enclosing the longitudinal axis (7) of the front part (4).
  11. Front part according to Claim 9 or 10, characterised in that at least one of the surface sections (16, 16', 24) encloses an angle of 75° to 90° with the longitudinal axis (7) of the front part (4).
  12. Front part according to one of Claims 4 to 11, characterised in that at least one of the surface sections (16) has a recess (49), which is arranged in a zone of the surface section (16) located radially on the outside and is extended as far as a peripheral shell of the base section (5).
  13. Front part according to Claim 12, characterised in that the recess (49) is saddle-shaped.
  14. Front part according to one of Claims 12 or 13, characterised in that the recess (49) forms an angle of less than 85° with the longitudinal axis (7) of the front part (4).
  15. Front part according to one of Claims 12 to 14, characterised in that the recess (49) is narrower in radial direction than the surface section (16).
  16. Front part according to one of Claims 1 to 15, characterised in that the webs (8) are provided with outer edges (45, 46), which are sloped or rounded in a direction running transversely to the longitudinal axis (7) of the front part (4).
  17. Front part according to one of Claims 1 to 15, characterised in that the flanks (8a) of the webs (8) are provided at least on their front side with sloping faces for demoulding.
  18. Front part according to Claim 17, characterised in that the sloping faces for demoulding are formed by faces (47), which enclose angles from 1° to 5° with associated central planes of the webs (8) located through the longitudinal axis (7) of the front part (4).
  19. Front part according to Claim 17 or 18, characterised in that the sloping faces for demoulding are provided on those flanks (8b) of the webs (8), which are stressed when unscrewing a screw.
  20. Front part according to Claim 18 or 19, characterised in that the faces (47) are extended over the entire length of the flanks (8b).
  21. Front part according to one of Claims 1 to 20, characterised in that the ratio of the length (LP) of the profile section (6) to the length (L0) of the penetration section (19) amounts to 1.25 to 1.85.
  22. Front part according to one of Claims 12 to 15 and 21, characterised in that the ratio of the length (LPK) of the profile section (6) to the length (LOK) of the penetration section (12) is higher than 1.5.
  23. Front part according to one of Claims 1 to 22, characterised in that the length of the penetration section (12) is up to 25% shorter than the maximum penetration depth (T) of the inner contour (40) of associated screws.
  24. Front part according to Claim 23, characterised in that the shorter dimension amounts to between 5% and 20% of the length of the penetration section (12).
  25. Front part according to one of Claims 23 or 24, characterised in that the ratio of the length (LP) of the profile section to the length (LO) of the penetration section (12) amounts to 1.20 to 1.90.
  26. Front part according to one of Claims 1 to 25, characterised in that the base part (5) is firmly connected to a drive part (2) on the side remote from the penetration section (12).
  27. Front part according to one of Claims 1 to 25, characterised in that the base part (5) is firmly connected to a shank of a screwdriver on the side remote from the penetration section (12).
  28. Front part according to one of Claims 1 to 25, characterised in that it is a component of a body in one piece configured as a screwdriver insert (1).
  29. Front part according to one of Claims 1 to 25, characterised in that it is configured as a screwdriver blade.
  30. Front part according to one of Claims 1 to 29, characterised in that the second transition surfaces (17a, 17b) are arched or curved in transverse direction and in their radial course with the same radii.
  31. Front part according to one of Claims 1 to 30, characterised in that it is formed by pressing or injection moulding.
  32. Screw driving tool with a front part (4), in particular a screwdriver insert or screwdriver blade, characterised in that the front part (4) is configured according to at least one of Claims 1 to 31.
EP03028939A 2002-11-22 2003-11-24 Screw driving tool, in particular screwdriver bit Expired - Lifetime EP1422027B1 (en)

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE20218102U DE20218102U1 (en) 2002-11-22 2002-11-22 Bit for screwdriver has facetted drive section with shaft and driver to formed by radial flanges with defined surfaces
DE20218102U 2002-11-22
DE20304246U 2003-03-14
DE20304246U DE20304246U1 (en) 2003-03-14 2003-03-14 Screwdriver insert, has penetration section with reduced length for cooperating with internal profile in screw
DE20309294 2003-06-13
DE20309294U 2003-06-13
DE20310364U 2003-07-05
DE20310364U DE20310364U1 (en) 2003-06-13 2003-07-05 Screwdriver tool has profiled front part with transition section between base and profiled section with first and second curved transition faces to increase torsion strength

Publications (3)

Publication Number Publication Date
EP1422027A2 EP1422027A2 (en) 2004-05-26
EP1422027A3 EP1422027A3 (en) 2005-08-24
EP1422027B1 true EP1422027B1 (en) 2007-07-18

Family

ID=32234253

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03028939A Expired - Lifetime EP1422027B1 (en) 2002-11-22 2003-11-24 Screw driving tool, in particular screwdriver bit

Country Status (4)

Country Link
EP (1) EP1422027B1 (en)
AT (1) ATE367243T1 (en)
DE (1) DE50307690D1 (en)
ES (1) ES2291587T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI784842B (en) * 2021-12-15 2022-11-21 洪昭敏 screwdriver head structure

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4990235B2 (en) * 2008-07-16 2012-08-01 株式会社ベッセル工業 Screwdriver tool
TW201420284A (en) * 2013-09-06 2014-06-01 Great Metal Production Co Ltd E Structure and manufacturing method for screwdriver driving portion
US11059162B2 (en) 2017-05-17 2021-07-13 Milwaukee Electric Tool Corporation Screwdriver
USD855433S1 (en) 2017-08-09 2019-08-06 Milwaukee Electric Tool Corporation Screwdriver

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL42923C (en) * 1934-07-03
DE959360C (en) * 1943-01-19 1957-03-07 Guest Keen & Nettlefolds Midla screwdriver
US3393722A (en) * 1966-07-19 1968-07-23 George W. Windham Bit end of tool
US5291811A (en) * 1992-05-14 1994-03-08 Textron Inc. Back-side taper wedging drive system
DE29621782U1 (en) * 1996-12-16 1998-04-09 Werner Hermann Wera Werke Screwdriver bit
US6223634B1 (en) * 1997-10-03 2001-05-01 Phillips Screw Company Recessed head fastener and driver systems
EP0947716A3 (en) * 1998-04-03 2000-08-23 Fairchild Holding Corp. Fastener system with cross-slot recess and cross-slot bit
DE19923855C2 (en) * 1999-05-25 2003-06-26 Werner Hermann Wera Werke Security screw and associated screwing tool
AU5027601A (en) * 2000-03-06 2001-09-17 Felo-Werkzeugfabrik Holland-Letz Gmbh Screwdriver insets

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI784842B (en) * 2021-12-15 2022-11-21 洪昭敏 screwdriver head structure

Also Published As

Publication number Publication date
DE50307690D1 (en) 2007-08-30
EP1422027A2 (en) 2004-05-26
EP1422027A3 (en) 2005-08-24
ES2291587T3 (en) 2008-03-01
ATE367243T1 (en) 2007-08-15

Similar Documents

Publication Publication Date Title
EP1175284B1 (en) Screwdriver insets
DE966764C (en) Process for the production of screwdrivers for screws and similar machine elements which have a recess with several radial slots in the head
EP1669149B1 (en) Tool and method for making a thread in a workpiece
DE102009028040B4 (en) Combination tool for structuring surfaces
DE102013003291B4 (en) Thread forming tool
EP1864737A2 (en) Tool for chip-removal
EP1616652A2 (en) Tool for the finish forming without chip removal of a preformed thread, method of manufacturing such a tool and method of producing a thread
WO2007076968A1 (en) Screw nut, method of production thereof and corresponding tool
EP2260965A2 (en) Drilling thread milling cutter
EP2848343B1 (en) Milling cutter with an edge cord having a specific tooth profile
DE2409077C3 (en) Screw element
EP0073926B1 (en) Cutting tool, in particular an indexable insert
EP1422027B1 (en) Screw driving tool, in particular screwdriver bit
DE102006015367B4 (en) Rotary tool for producing threads
DE2738035A1 (en) THREAD TAPPING SCREW WITH DRILL POINT
DE10144990A1 (en) Composite bit for screwdriver is manufactured from two segments made respectively of hard pressed and sintered metal and steel
DE3411557C2 (en)
DE102005009030B4 (en) Cutting tool, especially for micro and precision mold making
DE3337534C2 (en)
DE102021206784A1 (en) Wood drilling jig, wood drilling system and method of making a wood drilling jig
EP0142037B1 (en) Universal screw
DE10338754B4 (en) Tool for chipless production of a thread and method for producing a tool for chipless thread production
DE19511870A1 (en) Screwdriver with coated blade shaft
DE8329783U1 (en) Self-drilling and / or self-tapping universal screw
EP3660340A2 (en) Screw and drive element

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: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL LT LV MK

17P Request for examination filed

Effective date: 20050824

AKX Designation fees paid

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REF Corresponds to:

Ref document number: 50307690

Country of ref document: DE

Date of ref document: 20070830

Kind code of ref document: P

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: RO

Ref legal event code: EPE

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: E. BLUM & CO. AG PATENT- UND MARKENANWAELTE VSP

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20071029

ET Fr: translation filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

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: 20071218

Ref country code: BG

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: 20071018

Ref country code: FI

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: 20070718

REG Reference to a national code

Ref country code: HU

Ref legal event code: AG4A

Ref document number: E002326

Country of ref document: HU

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2291587

Country of ref document: ES

Kind code of ref document: T3

REG Reference to a national code

Ref country code: IE

Ref legal event code: FD4D

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

Ref country code: DK

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: 20070718

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: 20071019

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

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

Ref country code: SK

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: 20070718

Ref country code: IE

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: 20070718

26N No opposition filed

Effective date: 20080421

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

Ref country code: MC

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

Effective date: 20071130

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

Ref country code: EE

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: 20070718

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

Ref country code: RO

Payment date: 20081104

Year of fee payment: 6

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

Ref country code: SI

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: 20070718

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

Ref country code: CY

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: 20070718

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: 20071124

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

Ref country code: TR

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: 20070718

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

Ref country code: CZ

Payment date: 20091106

Year of fee payment: 7

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

Ref country code: HU

Payment date: 20081128

Year of fee payment: 6

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

Ref country code: HU

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

Effective date: 20091125

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

Ref country code: AT

Payment date: 20101119

Year of fee payment: 8

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

Ref country code: RO

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

Effective date: 20091124

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

Ref country code: CZ

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

Effective date: 20101124

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 50307690

Country of ref document: DE

Representative=s name: PATENT- UND RECHTSANWAELTE LOESENBECK, SPECHT,, DE

Ref country code: DE

Ref legal event code: R082

Ref document number: 50307690

Country of ref document: DE

Representative=s name: REHBERG HUEPPE + PARTNER, DE

Ref country code: DE

Ref legal event code: R082

Ref document number: 50307690

Country of ref document: DE

Representative=s name: REHBERG HUEPPE + PARTNER PATENTANWAELTE PARTG , DE

REG Reference to a national code

Ref country code: DE

Ref legal event code: R082

Ref document number: 50307690

Country of ref document: DE

Representative=s name: REHBERG HUEPPE + PARTNER, DE

Ref country code: DE

Ref legal event code: R082

Ref document number: 50307690

Country of ref document: DE

Representative=s name: REHBERG HUEPPE + PARTNER PATENTANWAELTE PARTG , DE

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 367243

Country of ref document: AT

Kind code of ref document: T

Effective date: 20111124

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

Ref country code: AT

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

Effective date: 20111124

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 13

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 14

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

Ref country code: CH

Payment date: 20161124

Year of fee payment: 14

Ref country code: FR

Payment date: 20161124

Year of fee payment: 14

Ref country code: NL

Payment date: 20161124

Year of fee payment: 14

Ref country code: DE

Payment date: 20161125

Year of fee payment: 14

Ref country code: GB

Payment date: 20161124

Year of fee payment: 14

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

Ref country code: BE

Payment date: 20161124

Year of fee payment: 14

Ref country code: SE

Payment date: 20161124

Year of fee payment: 14

Ref country code: ES

Payment date: 20161124

Year of fee payment: 14

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

Ref country code: IT

Payment date: 20171128

Year of fee payment: 15

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 50307690

Country of ref document: DE

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

REG Reference to a national code

Ref country code: NL

Ref legal event code: MM

Effective date: 20171201

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

Effective date: 20171124

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

Ref country code: LI

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

Effective date: 20171130

Ref country code: CH

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

Effective date: 20171130

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: 20171125

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20180731

Ref country code: BE

Ref legal event code: MM

Effective date: 20171130

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: 20171201

Ref country code: FR

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

Effective date: 20171130

Ref country code: DE

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

Effective date: 20180602

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: 20171124

Ref country code: BE

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

Effective date: 20171130

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: 20171125

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

Effective date: 20181124