EP0512248A1 - Screwing tool, especially screw driver - Google Patents

Screwing tool, especially screw driver Download PDF

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Publication number
EP0512248A1
EP0512248A1 EP92105569A EP92105569A EP0512248A1 EP 0512248 A1 EP0512248 A1 EP 0512248A1 EP 92105569 A EP92105569 A EP 92105569A EP 92105569 A EP92105569 A EP 92105569A EP 0512248 A1 EP0512248 A1 EP 0512248A1
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EP
European Patent Office
Prior art keywords
screwing tool
convex
sections
intermediate section
flank
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP92105569A
Other languages
German (de)
French (fr)
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EP0512248B1 (en
Inventor
Martin Strauch
Andreas Reusch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wera Werk Hermann Werner GmbH and Co KG
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Wera Werk Hermann Werner GmbH and Co KG
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Publication of EP0512248A1 publication Critical patent/EP0512248A1/en
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    • 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
    • B25B15/008—Allen-type keys
    • 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 screwing tool according to the preamble of claim 1.
  • a screwing tool for internal polygonal screws is known from DE 32 06 494 A1, two adjacent polygon corners being connected by two convexly shaped flank sections to form a gusset in the central region of each flank. Since this springs back in relation to a tangent placed on the convexly shaped flank sections, the force contact surface is reduced in connection with the fact that even a reduced torque can be transmitted.
  • the gusset weakens the transmission stability of the screwing tool mainly due to its notch effect.
  • the object of the invention is based on the design of a screwing tool of the type in question in a technically simple manner so that optimal torques can be transmitted in relation to the size of the screwing tool.
  • a screwing tool in particular a screwdriver for hexagon socket screws, in particular hexagon socket screws
  • hexagon socket screws can be of increased use value. It can be in relation to the size of the screwing tool or its Transfer optimal torque at low end of work.
  • each convex flank section has more than twice the length of the intermediate section.
  • a ratio between the flank section and the intermediate section of 4: 1 is recommended. Deviations up or down are possible.
  • the straight intermediate section extends tangentially to the adjacent end region of both convex flank sections. In the case of a concave intermediate section, the approximately the same length of all the curved sections is advantageous.
  • the intermediate section can be formed by a throat filled with diamond particles. Sliding out of the working end from the inner polygon is therefore further counteracted.
  • the screwdriver 1 illustrated in FIG. 1 has a handle 2 with a blade 3 embedded therein, which can be rotated with respect to the handle.
  • the latter has a shaft 4 with a circular cylindrical cross section, which forms a hexagonal outer polygon 5 at the end. This represents the working end of the screwdriver 1 and is suitable for plunging into the hexagon socket 6 of the screw head 7 of a hexagon socket screw 8.
  • the hexagon socket 6 is composed of the straight hexagon socket surfaces 9 such that two hexagon socket surfaces meet in an edge 10.
  • the distance between two mutually parallel, opposite hexagon socket surfaces 9 is the key width S.
  • the outer polygon 5 has on each flank 11 two convex flank sections 12 which are separated from one another by a non-convex intermediate section 13 in the central region of the flank 11 are separated. Furthermore, the polygon corner ends 14 of the convex flank sections 12 are set back in relation to the straight extension 15 of the two end points 16 of the intermediate section 13, cf. in this regard, in particular, FIG. 5.
  • the end points 16 form, in a certain way, 12 corner points due to the adjoining convex flank sections, so that an eighteen-sided edge results in a hexagonal working end in connection with the polygonal ends 14.
  • FIG. 5 shows that the rectilinear intermediate section 13 extends tangentially to the adjacent end region of both convex flank sections 12.
  • the corresponding tangent 18 includes an angle alpha of approximately 3.5 ° with the connecting lines 17.
  • the length y of the convex flank section 11 is twice the length x of the intermediate section 13. In the exemplary embodiment, a ratio between flank section 12 and intermediate section 13 of approximately 4: 1 is selected.
  • the distance dimension between two parallel opposing flanks 11 of the hexagon socket 5 is the width across flats 51, which is adapted to that of the hexagon socket 6.
  • the screw 8 as illustrated in FIG. 4, is to be taken along in the direction of the arrow by means of the screwdriver 1, the external hexagon 5, which represents the end of the work, must first be inserted into the hexagonal socket opening 6 of the screw head 7. Then turn the screwdriver 1 in the direction of the arrow. There is a slight relative rotation by the angle beta between the hexagon socket screw 8 and the hexagon socket 5. Taking into account a certain deformation of the screw head 7, there is a large support surface between the hexagon socket surfaces 9 and the corresponding convex flank sections 12. In detail, this means that almost a flank section 12 of each flank 11 and also the intermediate section 13 or a large part its length comes to rest on the hexagon socket surface 9, so that optimal torques can be transmitted.
  • the polygonal ends 14 '- including any tolerances permitted by DIN - are in a normal distance A (see FIG. 9) from the tangent T, applied to the lowest point P of the convex area.
  • This distance A is smaller than the normal distance M that the vertex Sch has from this tangent T.
  • 10 and 11 show that even in the event of an accidental (unfavorable) addition of the tolerances, this embodiment embodies in an optimal way the advantage that digging into the edges is avoided and, above all, that the area of load transmission is as large as possible from the lever arm Polygon center point Mp.
  • the centers Z (see FIG. 12) of the convex flank sections 12 ' lie at a distance a from the polygon center Mp and beyond the respective cross section bisecting H-H, the latter by the dimension b, which is approximately half as large as the dimension a.
  • the dimension a corresponds to approximately 1/4 the length of the cross-section bisector H-H.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Dowels (AREA)
  • Macromonomer-Based Addition Polymer (AREA)

Abstract

The invention relates to a screwing tool, especially a screwdriver (1) or a screwdriver insert, for polygon socket screws (8), having flank sections (12) shaped convexly in the circumferential direction; to optimise the transfer of force, it is proposed that the flank sections (12/12') are interrupted with respect to one another in the central region of each flank (11) by a non-convexly running intermediate section (13, 13'). <IMAGE>

Description

Die Erfindung betrifft ein Schraubwerkzeug gemäß Gattungsbegriff des Anspruchs 1.The invention relates to a screwing tool according to the preamble of claim 1.

Ein Schraubwerkzeug für Innenmehrkantschrauben ist bekannt aus der DE 32 06 494 A1, wobei zwei einander benachbarte Mehrkantecken durch zwei konvex gestaltete Flankenabschnitte verbunden sind unter Bildung eines Zwickels im mittleren Bereich jeder Flanke. Da dieser gegenüber einer an die konvex gestalteten Flankenabschnitte gelegten Tangente zurückspringt, verringert sich die Kraftanlagefläche verbunden damit, daß auch nur ein verringertes Drehmoment übertragbar ist. Der Zwickel schwächt vor allem infolge seiner Kerbwirkung die Übertragungsstabilität des Schraubwerkzeuges.A screwing tool for internal polygonal screws is known from DE 32 06 494 A1, two adjacent polygon corners being connected by two convexly shaped flank sections to form a gusset in the central region of each flank. Since this springs back in relation to a tangent placed on the convexly shaped flank sections, the force contact surface is reduced in connection with the fact that even a reduced torque can be transmitted. The gusset weakens the transmission stability of the screwing tool mainly due to its notch effect.

Dem Gegenstand der Erfindung liegt die Aufgabe zugrunde, ein Schraubwerkzeug der in Rede stehenden Art in herstellungstechnisch einfacher Weise so auszugestalten, daß im Verhältnis zur Größe des Schraubwerkzeugs optimale Drehmomente übertragbar sind.The object of the invention is based on the design of a screwing tool of the type in question in a technically simple manner so that optimal torques can be transmitted in relation to the size of the screwing tool.

Gelöst wird diese Aufgabe bei einem gattungsgemäßen Schraubwerkzeug durch die im Kennzeichen des Anspruchs 1 angegebenen Merkmale.This object is achieved in a generic screwing tool by the features specified in the characterizing part of claim 1.

Die Unteransprüche betreffen vorteilhafte Weiterbildungen der erfinderischen Lösung.The subclaims relate to advantageous developments of the inventive solution.

Zufolge derartiger Ausgestaltung ist ein Schraubwerkzeug, insbesondere Schraubendreher für Innenmehrkantschrauben, insbesondere Innensechskantschrauben, von erhöhtem Gebrauchswert angegeben. Es lassen sich im Verhältnis zur Größe des Schraubwerkzeugs bzw. dessen Arbeitsende optimale Drehmomente bei geringem Verschleiß übertragen. Dies resultiert daraus, daß die konvex verlaufenden Flankenabschnitte im mittleren Bereich jeder Flanke durch einen nicht konvex verlaufenden Zwischenabschnitt voneinander getrennt sind. Ferner liegt eine spezielle Anordnung der mehrkanteckseitigen Enden der konvex verlaufenden Abschnitte gegenüber der geradlinigen Verlängerung der beiden Endpunkte des Zwischenabschnittes oder der Tangente an diesen vor. Das bedeutet, daß bei in Wirkung gebrachtem Schraubwerkzeug und Ausübung eines Drehmomentes jede Flanke mit einem konvex verlaufenden Flankenabschnitt und dem nicht konvex verlaufenden Zwischenabschnitt bzw. einer Teillänge desselben in Anlage tritt zu der korrespondierenden Innensechskantfläche der Schraube. Es liegen optimale Hebelarme vor für die Bereiche der Krafteinleitung. Mit größer werdendem Drehmoment ergibt sich unter Berücksichtigung der Verformung am Schraubenkopf eine sich ständig vergrößernde Abstützungsfläche verbunden mit der eingangs erwähnten optimalen Übertragung eines Drehmoments. Aufgrund der sich ständig vergrößernden Abstützungsfläche wird auch einem "cam out-Effekt" entgegengewirkt; das bedeutet, daß das Schraubwerkzeug, insbesondere Schraubendreher, mit seinem Arbeitsende in Eingriff zum Innenmehrkant der Schraube verbleibt. Infolge der zurückspringenden mehrkanteckseitigen Enden ist ein bequemes Einführen des Arbeitsendes in den Innenmehrkant ermöglicht, selbst wenn dessen Ecken aufgrund von Fertigungstoleranzen leicht gerundet sind. Stets ist daher verwirklicht, daß die Flanken mit ihren konvex verlaufenden Flankenabschnitten und den nicht konvex gerichteten Zwischenabschnitten in Anlage zu den Mehrkantflächen des Innenmehrkants gelangen. Aufgrund des nicht konvex verlaufenden bzw. sogar konkaven Zwischenabschnittes zwischen den konvexen Flankenabschnitten jeder Flanke ergeben sich stumpfwinklige, nahe bei 180° liegende Ecken, die in Verbindung mit den mehrkanteckseitigen Enden z.B. aus einem Sechskant ein Achtzehnkant machen. Die konvex verlaufenden Flankenabschnitte sind von Bögen gebildet, die die Verbindungslinie zwischen den Ecken der Zwischenabschnitte und den mehrkanteckseitigen Enden überragen. Es erweist sich von Vorteil, daß die Zwischenabschnitte geradlinig verlaufen. Dies kommt auch einer einfachen Herstellung des Arbeitsendes des Schraubwerkzeugs entgegen. Hinsichtlich einer guten Drehmomentübertragung erweist es sich als vorteilhaft, daß jeder konvex verlaufende Flankenabschnitt mehr als das Doppelte der Länge des Zwischenabschnittes besitzt. Bei einem Schraubendreher für Innensechskantschrauben empfiehlt sich ein Verhältnis zwischen Flankenabschnitt und Zwischenabschnitt von 4:1. Abweichungen nach oben oder unten sind möglich. Weiterhin ist hervorzuheben, daß der geradlinige Zwischenabschnitt tangential zum benachbarten Endbereich beider konvexen Flankenabschnitte verläuft. Bei konkavem Zwischenabschnitt ist die etwa gleiche Länge aller Bogenabschnitte vorteilhaft. Gegebenenfalls kann der Zwischenabschnitt durch eine mit Diamant-Partikeln ausgefüllte Kehle gebildet sein. Einem Herausgleiten des Arbeitsendes aus dem Innenmehrkant wird daher weiter entgegengewirkt. Es besteht jedoch auch die Möglichkeit, sowohl die Flankenabschnitte als auch die Zwischenabschnitte mit einer Diamant-Partikelbeschichtung auszustatten. Dies kann dadurch geschehen, daß dem Galvanisierungsbad ein Diamantpulver im Bereich von etwa 15µm beigegeben wird. Einhergehend mit der Beschichtung erzielt man auch eine Verschleißminderung des Arbeitsendes.As a result of such a configuration, a screwing tool, in particular a screwdriver for hexagon socket screws, in particular hexagon socket screws, is of increased use value. It can be in relation to the size of the screwing tool or its Transfer optimal torque at low end of work. This results from the fact that the convex flank sections in the central region of each flank are separated from one another by a non-convex intermediate section. Furthermore, there is a special arrangement of the polygonal ends of the convex sections with respect to the straight extension of the two end points of the intermediate section or the tangent to the latter. This means that when the screwing tool is brought into effect and a torque is exerted, each flank with a convex flank section and the non-convex intermediate section or a partial length thereof comes into contact with the corresponding hexagon socket surface of the screw. There are optimal lever arms for the areas of force application. With increasing torque, taking into account the deformation on the screw head, there is a constantly increasing support surface combined with the optimal transmission of a torque mentioned at the beginning. Due to the constantly increasing support surface, a "cam out effect" is also counteracted; this means that the screwing tool, in particular screwdriver, remains in engagement with the polygon of the screw with its working end. As a result of the recessed polygonal ends, a comfortable insertion of the working end into the polygon is made possible, even if its corners are slightly rounded due to manufacturing tolerances. It is therefore always realized that the flanks with their convex flank sections and the non-convex intermediate sections come into contact with the polygonal surfaces of the inner polygon. Because of the non-convex or even concave intermediate section between the convex flank sections of each flank, obtuse-angled corners close to 180 ° which, in conjunction with the polygonal ends, turn an hexagon into an eighteen-sided. The convex flank sections are formed by arches which project beyond the connecting line between the corners of the intermediate sections and the polygonal ends. It proves advantageous that the intermediate sections run in a straight line. This also accommodates a simple manufacture of the working end of the screwing tool. With regard to good torque transmission, it proves to be advantageous that each convex flank section has more than twice the length of the intermediate section. With a screwdriver for hexagon socket screws, a ratio between the flank section and the intermediate section of 4: 1 is recommended. Deviations up or down are possible. It should also be emphasized that the straight intermediate section extends tangentially to the adjacent end region of both convex flank sections. In the case of a concave intermediate section, the approximately the same length of all the curved sections is advantageous. If necessary, the intermediate section can be formed by a throat filled with diamond particles. Sliding out of the working end from the inner polygon is therefore further counteracted. However, it is also possible to equip both the flank sections and the intermediate sections with a diamond particle coating. This can be done by adding a diamond powder in the range of about 15 µm to the electroplating bath. Along with the coating, wear is also reduced on the working end.

Nachstehend wird ein Ausführungsbeispiel der Erfindung anhand der Zeichnungen erläutert. Es zeigt

Fig. 1
einen Schraubendreher für Innensechskantschrauben und eine koaxial dazu angeordnete Innensechskantschraube in Ansicht,
Fig. 2
in stark vergrößerter Darstellung einen Querschnitt durch den Schraubenkopf im Bereich des Innensechskants,
Fig. 3
ebenfalls in stark vergrößerter Darstellung einen Querschnitt durch das Arbeitsende des Schraubendrehers,
Fig. 4
den Querschnitt durch den Schraubenkopf mit in dessen Innenmehrkant eingestecktem Arbeitsende des Schraubendrehers bei einer Drehmitnahme desselben in Pfeilrichtung,
Fig. 5
in weiterhin vergrößerter Darstellung einen ausschnittsweisen Grundriß des Arbeitsendes des Schraubendrehers,
Fig. 6
in stark vergrößerter Darstellung den Quer schnitt durch den Schraubenkopf mit in dessen Innenmehrkant eingestecktem Arbeitsende des Schraubendrehers einer abgewandelten Ausführungsform,
Fig. 7
die Darstellung wie Fig. 6 in Drehmitnahme-Be lastungsstellung,
Fig. 8
eine vergrößerte Darstellung der min./max. Toleranzen des Innenmehrkantes einer Schraube Schlüsselweite 6,
Fig. 9
eine gleiche Darstellung wie Fig. 8 aber bzgl. des Arbeitsendes (Querschnitt) der abgewandelten Ausführung nach Fig. 6,
Fig. 10 und 11
eine vergrößerte Darstellung wie Fig. 7 unter Berücksichtigung der (zulässigen) Fertigungstoleranzen der Fig. 8 und 9 bei Schlüsselweite 6 und
Fig. 12
in vergrößerter Darstellung einen Teilschnitt-Umrissdarstellung zur Verdeutlichung der Soge der Zentren der Bögen.
An embodiment of the invention is explained below with reference to the drawings. It shows
Fig. 1
a screwdriver for hexagon socket screws and a coaxially arranged hexagon socket screw in view,
Fig. 2
in a greatly enlarged representation a cross section through the screw head in the area of the hexagon socket,
Fig. 3
also in a greatly enlarged illustration a cross section through the working end of the screwdriver,
Fig. 4
2 shows the cross section through the screw head with the working end of the screwdriver inserted into its internal polygon when driving the same in the direction of the arrow,
Fig. 5
in a further enlarged view a partial plan view of the working end of the screwdriver,
Fig. 6
in a greatly enlarged representation, the cross section through the screw head with the working end of the screwdriver inserted into the internal polygon of a modified embodiment,
Fig. 7
6 in the rotary driving loading position,
Fig. 8
an enlarged view of the min./max. Tolerances of the inner polygon of a screw wrench size 6,
Fig. 9
a same representation as Fig. 8 but with regard to the working end (cross section) of the modified embodiment according to FIG. 6,
10 and 11
an enlarged view like FIG. 7, taking into account the (permissible) manufacturing tolerances of FIGS. 8 and 9 with wrench size 6 and
Fig. 12
in an enlarged representation, a partial sectional outline representation to illustrate the suction of the centers of the arches.

Der in Fig. 1 veranschaulichte Schraubendreher 1 besitzt einen Griff 2 mit in diesem eingelassener, gegenüber dem Griff undrehbarer Klinge 3. Letztere weist einen im Querschnitt kreiszylindrischen Schaft 4 auf, welcher endseitig einen sechseckigen Außenmehrkant 5 ausbildet. Dieser stellt das Arbeitsende des Schraubendrehers 1 dar und ist geeignet, in den Innensechkant 6 des Schraubenkopfes 7 einer Innensechskantschraube 8 einzutauchen.The screwdriver 1 illustrated in FIG. 1 has a handle 2 with a blade 3 embedded therein, which can be rotated with respect to the handle. The latter has a shaft 4 with a circular cylindrical cross section, which forms a hexagonal outer polygon 5 at the end. This represents the working end of the screwdriver 1 and is suitable for plunging into the hexagon socket 6 of the screw head 7 of a hexagon socket screw 8.

Im einzelnen setzt sich der Innensechskant 6 aus den geradlinig verlaufenden Innensechskantflächen 9 zusammen derart, daß zwei Innensechskantflächen sich in einer Kante 10 treffen. Der Abstand zweier parallel zueinander verlaufender, gegenüberliegender Innensechskantflächen 9 ist die Schlüsselweite S.Specifically, the hexagon socket 6 is composed of the straight hexagon socket surfaces 9 such that two hexagon socket surfaces meet in an edge 10. The distance between two mutually parallel, opposite hexagon socket surfaces 9 is the key width S.

Während an der Schraube 8 geradlinige Innensechskantflächen 9 vorliegen, besitzt der Außenmehrkant 5 an jeder Flanke 11 zwei konvex verlaufende Flankenabschnitte 12, die im mittleren Bereich der Flanke 11 durch einen nicht konvex verlaufenden Zwischenabschnitt 13 voneinander getrennt sind. Ferner sind die mehrkanteckseitigen Enden 14 der konvex verlaufenden Flankenabschnitte 12 gegenüber der geradlinigen Verlängerung 15 der beiden Endpunkte 16 des Zwischenabschnittes 13 zurückspringend angeordnet, vgl. hierzu insbesondere Fig. 5. Die Endpunkte 16 bilden in gewisser Hinsicht zufolge der sich anschließenden konvexen Flankenabschnitte 12 Eckpunkte, so daß sich bei einem hexagonalen Arbeitsende in Verbindung mit den mehrkanteckseitigen Enden 14 ein Achtzehnkant ergibt.While there are rectilinear hexagon surfaces 9 on the screw 8, the outer polygon 5 has on each flank 11 two convex flank sections 12 which are separated from one another by a non-convex intermediate section 13 in the central region of the flank 11 are separated. Furthermore, the polygon corner ends 14 of the convex flank sections 12 are set back in relation to the straight extension 15 of the two end points 16 of the intermediate section 13, cf. in this regard, in particular, FIG. 5. The end points 16 form, in a certain way, 12 corner points due to the adjoining convex flank sections, so that an eighteen-sided edge results in a hexagonal working end in connection with the polygonal ends 14.

Die Verbindungslinien 17 zwischen den Endpunkten 16 des Zwischenabschnittes 13 und den mehrkanteckseitigen Enden 14 sind überragt von den konvex verlaufenden Flankenabschnitten 12. Ferner geht aus Fig. 5 hervor, daß der geradlinige Zwischenabschnitt 13 tangential zum benachbarten Endbereich beider konvexen Flankenabschnitte 12verläuft. Die entsprechende Tangente 18 schließt dabei mit den Verbindungslinien 17 einen Winkel Alpha von ca. 3,5° ein.The connecting lines 17 between the end points 16 of the intermediate section 13 and the polygonal ends 14 are dominated by the convex flank sections 12. Furthermore, FIG. 5 shows that the rectilinear intermediate section 13 extends tangentially to the adjacent end region of both convex flank sections 12. The corresponding tangent 18 includes an angle alpha of approximately 3.5 ° with the connecting lines 17.

Die Länge y des konvex verlaufenden Flankenabschnittes 11 ist doppelt so groß wie die Länge x des Zwischenabschnittes 13. Beim Ausführungsbeispiel ist ein Verhältnis zwischen Flankenabschnitt 12 und Zwischenabschnitt 13 von etwa 4:1 gewählt.The length y of the convex flank section 11 is twice the length x of the intermediate section 13. In the exemplary embodiment, a ratio between flank section 12 and intermediate section 13 of approximately 4: 1 is selected.

Das Abstandsmaß zweier sich parallel gegenüberliegender Flanken 11 des Außensechskants 5 ist die Schlüsselweite 51, die derjenigen des Innensechskants 6 angepaßt ist.The distance dimension between two parallel opposing flanks 11 of the hexagon socket 5 is the width across flats 51, which is adapted to that of the hexagon socket 6.

Es ist möglich, wie in Fig. 5 strichpunktiert veranschaulicht ist, im Bereich des Zwischenabschnittes 13 eine in Schaftlängsrichtung verlaufende Auskehlung 19 vorzusehen zur Aufnahme von Diamant-Partikeln, deren Außenfläche den geradlinigen Zwischenabschnitt 13 bildet. Es bietet sich jedoch auch an, das Arbeitsende selbst mit einer Diamant-Partikelbeschichtung auszustatten.It is possible, as illustrated by dash-dotted lines in FIG. 5, to provide in the region of the intermediate section 13 a groove 19 running in the longitudinal direction of the shaft for receiving diamond particles, the outer surface of which forms the rectilinear intermediate section 13. It offers However, it is also a good idea to equip the end of the work itself with a diamond particle coating.

Soll die Schraube 8, wie in Fig. 4 veranschaulicht ist, mittels des Schraubendrehers 1 in Pfeilrichtung mitgenommen werden, so ist zuerst der Außensechskant 5, der das Arbeitsende darstellt, in die Innensechskantöffnung 6 des Schraubenkopfes 7 einzuführen. Anschließend ist der Schraubendreher 1 in Pfeilrichtung zu drehen. Es findet hierbei eine geringfügige Relativverdrehung um den Winkel Beta zwischen Innensechskantschraube 8 und Außensechskant 5 statt. Unter Berücksichtigung einer gewissen Verformung des Schraubenkopfes 7 ergibt sich eine groß bemessene Abstützungsfläche zwischen den Innensechskantflächen 9 und den entsprechenden konvexen Flankenabschnitten 12. Im Detail sieht dies so aus, daß nahezu ein Flankenabschnitt 12 jeder Flanke 11 und auch der Zwischenabschnitt 13 bzw. ein großer Teil seiner Länge zur Anlage an der Innensechskantfläche 9 gelangt, so daß optimale Drehmomente übertragbar sind. Aufgrund der Verformung am Schraubenkopf vergrößert sich die Abstützungsfläche bei größer werdender Drehmoment-Übertragung. Zufolge dieser großen Abstützungsfläche wird auch einem "cam out-Effekt" entgegengewirkt, so daß das Arbeitsende des Schraubendrehers 1 in Formschlußverbindung zur Innensechskantschraube 8 verbleibt und nicht herausspringt bzw. aus der Innensechskantöffnung 6 herausgleitet.If the screw 8, as illustrated in FIG. 4, is to be taken along in the direction of the arrow by means of the screwdriver 1, the external hexagon 5, which represents the end of the work, must first be inserted into the hexagonal socket opening 6 of the screw head 7. Then turn the screwdriver 1 in the direction of the arrow. There is a slight relative rotation by the angle beta between the hexagon socket screw 8 and the hexagon socket 5. Taking into account a certain deformation of the screw head 7, there is a large support surface between the hexagon socket surfaces 9 and the corresponding convex flank sections 12. In detail, this means that almost a flank section 12 of each flank 11 and also the intermediate section 13 or a large part its length comes to rest on the hexagon socket surface 9, so that optimal torques can be transmitted. Due to the deformation of the screw head, the support surface increases as torque transmission increases. As a result of this large support surface, a "cam out effect" is also counteracted, so that the working end of the screwdriver 1 remains in positive connection with the hexagon socket screw 8 and does not jump out or slide out of the hexagon socket opening 6.

Die Fig. 6-12 zeigen eine abgewandelte Ausführungsform. Hier ist der nicht konvex verlaufende Abschnitt 13' konkav gestaltet. Beiderseits dessen liegen jeweils die konvex verlaufenden Flankenabschnitte 12'.6-12 show a modified embodiment. Here, the non-convex section 13 'is concave. The convex flank sections 12 'are located on both sides thereof.

Die mehrkanteckseitigen Enden 14' liegen - eingeschlossen die etwaigen, nach DIN zulässigen Toleranzen - in einem Normalen-Abstand A ( siehe Fig. 9) von der Tangente T, angelegt an den Tiefstpunkt P des konvexen Bereiches. Dieser Abstand A ist kleiner als der Normalen-Abstand M, den der Scheitel Sch von dieser Tangente T hat. Die Fig. 10 und 11 zeigen, daß selbst bei zufälliger (ungünstiger) Addition der Toleranzen diese Ausführungsform noch in optimaler Weise den Vorteil verkörpert, daß eine eingrabende Kantenberührung vermieden und vor allem aber, daß der Bereich der Belastungs-Übertragung in möglichst großem Hebelarm vom Mehrkantenmittelpunkt Mp liegt.The polygonal ends 14 '- including any tolerances permitted by DIN - are in a normal distance A (see FIG. 9) from the tangent T, applied to the lowest point P of the convex area. This distance A is smaller than the normal distance M that the vertex Sch has from this tangent T. 10 and 11 show that even in the event of an accidental (unfavorable) addition of the tolerances, this embodiment embodies in an optimal way the advantage that digging into the edges is avoided and, above all, that the area of load transmission is as large as possible from the lever arm Polygon center point Mp.

Die Zentren Z (siehe Fig. 12) der konvex-verlaufenden Flankenabschnitte 12' liegen mit Abstand a vom Mehrkantmittelpunkt Mp und jenseits der jeweiligen Querschnitts halbierenden H-H, letzteres um das Maß b, welches etwa halb so groß ist wie das Maß a.The centers Z (see FIG. 12) of the convex flank sections 12 'lie at a distance a from the polygon center Mp and beyond the respective cross section bisecting H-H, the latter by the dimension b, which is approximately half as large as the dimension a.

Das Maß a entspricht etwa 1/4 der Länge der Querschnittshalbierenden H-H.The dimension a corresponds to approximately 1/4 the length of the cross-section bisector H-H.

Die in der vorstehenden Beschreibung, der Zeichnung und den Ansprüchen offenbarten Merkmale der Erfindung können sowohl einzeln als auch in beliebiger Kombination für die Verwirklichung der Erfindung von Bedeutung sein. Alle offenbarten Merkmale sind erfindungswesentlich. In die Offenbarung der Anmeldung wird hiermit auch der Offenbarungsinhalt der zugehörigen/beigefügten Prioritätsunterlagen (Abschrift der Voranmeldung) vollinhaltlich mit einbezogen.The features of the invention disclosed in the above description, the drawing and the claims can be of importance both individually and in any combination for the implementation of the invention. All disclosed features are essential to the invention. The disclosure content of the associated / attached priority documents (copy of the prior application) is hereby also included in full in the disclosure of the application.

Claims (9)

Schraubwerkzeug, insbesondere Schraubendreher (1) oder Schraubendreher-Einsatz, für Innenmehrkantschrauben, insbesondere Innensechskantschrauben (8), mit in Umfangsrichtung konvex gestalteten Flankenabschnitten (12) zwischen den Mehrkantecken, dadurch gekennzeichnet, daß die konvex verlaufenden Flankenabschnitte (12/12') im mittleren Bereich jeder Flanke (11) durch einen nicht konvex verlaufenden Zwischenabschnitt (13/13') voneinander getrennt sind.Screwing tool, in particular screwdriver (1) or screwdriver insert, for hexagon socket screws, in particular hexagon socket screws (8), with flank sections (12) designed in the circumferential direction between the polygon corners, characterized in that the convex flank sections (12/12 ') in the middle Area of each flank (11) are separated from one another by a non-convex intermediate section (13/13 '). Schraubwerkzeug nach Anspruch 1 oder insbesondere danach, dadurch gekennzeichnet, daß die mehrkanteckseitigen Enden (14) der konvex verlaufenden Flankenabschnitte (12) gegenüber der geradlinigen Verlängerung (15) der beiden Endpunkte (16) des Zwischenabschnittes (13) zurückspringend angeordnet sind.Screwing tool according to Claim 1 or in particular according thereto, characterized in that the polygonal ends (14) of the convexly extending flank sections (12) are arranged to set back in relation to the straight extension (15) of the two end points (16) of the intermediate section (13). Schraubwerkzeug nach Anspruch 1 oder insbesondere danach, dadurch gekennzeichnet, daß die Zwischenabschnitte (13) geradlinig verlaufen.Screwing tool according to claim 1 or in particular according thereto, characterized in that the intermediate sections (13) run in a straight line. Schraubwerkzeug nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, daß der geradlinige Zwischenabschnitt (13) tangential zum benachbarten Endbereich beider konvexen Flankenabschnitte (12) verläuft.Screwing tool according to one or more of the preceding claims or in particular according thereto, characterized in that the rectilinear intermediate section (13) extends tangentially to the adjacent end region of both convex flank sections (12). Schraubwerkzeug nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, daß sowohl die konvexen Flankenabschnitte (12/12') als auch die Zwischenabschnitte (13/13') mit einer Diamant-Partikelbeschichtung ausgestattet sind.Screwing tool according to one or more of the preceding claims or in particular according thereto, characterized in that both the convex flank sections (12/12 ') and the intermediate sections (13/13') are equipped with a diamond particle coating. Schraubwerkzeug nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, daß der Zwischenabschnitt (13') konkav verläuft.Screwing tool according to one or more of the preceding claims or in particular according thereto, characterized in that the intermediate section (13 ') is concave. Schraubwerkzeug nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, daß die Länge (X') des konkaven Zwischenabschnittes (13') etwa der Länge des konvex verlaufenden Bereiches (12') entspricht.Screwing tool according to one or more of the preceding claims or in particular according thereto, characterized in that the length (X ') of the concave intermediate section (13') corresponds approximately to the length of the convex region (12 '). Schraubwerkzeug nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, daß die mehrkantseitigen Enden (14) der konvex verlaufenden Bereiche von der in den Tiefstpunkt P des konkaven Bereiches angelegten Tangente T einen kleineren Nomalen-Abstand A haben als der Scheitelpunkt Sch ihn von dieser Tangente T hat.Screwing tool according to one or more of the preceding claims or in particular according thereto, characterized in that the polygonal ends (14) of the convex regions have a smaller nominal distance A from the tangent T applied in the lowest point P of the concave region than the apex Sch him from this tangent T. Schraubwerkzeug nach einem oder mehreren der vorhergehenden Ansprüche oder insbesondere danach, dadurch gekennzeichnet, daß der Abstand a etwa der Hälfte der vom Mehrkantmittelpunkt Mp bis zum zugehörigen mehrkantseitigen Ende (14') reichenden Strecke Mp-H liegt.Screwing tool according to one or more of the preceding claims or in particular according thereto, characterized in that the distance a is approximately half of the distance Mp-H extending from the polygon center point Mp to the associated polygonal end (14 ').
EP92105569A 1991-05-02 1992-04-01 Screwing tool, especially screw driver Expired - Lifetime EP0512248B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE9105419U 1991-05-02
DE9105419 1991-05-02
DE9110904U 1991-09-03
DE9110904U DE9110904U1 (en) 1991-05-02 1991-09-03 Screwing tools, especially screwdrivers

Publications (2)

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EP0512248A1 true EP0512248A1 (en) 1992-11-11
EP0512248B1 EP0512248B1 (en) 1996-06-05

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EP92105569A Expired - Lifetime EP0512248B1 (en) 1991-05-02 1992-04-01 Screwing tool, especially screw driver

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US (1) US5284075A (en)
EP (1) EP0512248B1 (en)
JP (1) JP3285380B2 (en)
AT (1) ATE138840T1 (en)
DE (2) DE9110904U1 (en)
DK (1) DK0512248T3 (en)
ES (1) ES2087332T3 (en)
GR (1) GR3020592T3 (en)
HK (1) HK41997A (en)
SG (1) SG43839A1 (en)

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EP2372176A1 (en) * 2010-03-19 2011-10-05 David Hui Anti-wearing nuts and bolts
DE102007022031B4 (en) * 2006-06-28 2013-09-12 Klann-Spezial-Werkzeugbau-Gmbh Device for aligning a pressure plate of a spring tensioner

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DE10011065A1 (en) * 2000-03-07 2001-09-13 Delphi Tech Inc Torque transmission coupling for two steering column sections in road vehicle, with one end of first shaft having face-side hollow space enclosed by at least three abutting contact surfaces
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US10697499B2 (en) * 2015-03-19 2020-06-30 Acument Intellectual Properties, Llc Drive system with full surface drive contact
JP2017193022A (en) * 2016-04-21 2017-10-26 三菱重工業株式会社 Key wrench
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
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Also Published As

Publication number Publication date
SG43839A1 (en) 1997-11-14
DK0512248T3 (en) 1996-10-28
ES2087332T3 (en) 1996-07-16
HK41997A (en) 1997-04-11
JP3285380B2 (en) 2002-05-27
DE59206460D1 (en) 1996-07-11
US5284075A (en) 1994-02-08
EP0512248B1 (en) 1996-06-05
JPH05146974A (en) 1993-06-15
ATE138840T1 (en) 1996-06-15
DE9110904U1 (en) 1992-09-03
GR3020592T3 (en) 1996-10-31

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