EP0453976B1 - Screwdriver blade - Google Patents
Screwdriver blade Download PDFInfo
- Publication number
- EP0453976B1 EP0453976B1 EP91106288A EP91106288A EP0453976B1 EP 0453976 B1 EP0453976 B1 EP 0453976B1 EP 91106288 A EP91106288 A EP 91106288A EP 91106288 A EP91106288 A EP 91106288A EP 0453976 B1 EP0453976 B1 EP 0453976B1
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- European Patent Office
- Prior art keywords
- screw
- screwdriver
- blade
- width
- head
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- 230000008719 thickening Effects 0.000 claims description 6
- IHQKEDIOMGYHEB-UHFFFAOYSA-M sodium dimethylarsinate Chemical class [Na+].C[As](C)([O-])=O IHQKEDIOMGYHEB-UHFFFAOYSA-M 0.000 claims 1
- 230000005540 biological transmission Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
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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
- B25B15/004—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section
- B25B15/007—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section with blade of flat or substantially flat cross-section
Definitions
- the present invention relates to a screwdriver blade according to the preamble of claim 1.
- an M 1.2 screw (metric thread) with an outer thread diameter of 1.2 mm
- an M 12 screw has a slot width of 3 mm.
- the required force transmission between screwdriver and slot should take place optimally when the screw is screwed in and loosened, and the screw heads should not be slashed out after a few uses, a whole set of no fewer than 11 individually graduated screwdrivers marked with sizes 00-9 according to VSM.
- a screwdriver blade has become known from US Pat. No. 4,016,912, the broad side of which has a thickening. This thickening is geometrically very short, which is why such a screwdriver blade can cover only one slot width in practice. A wide range of different slot sizes cannot be grasped with the present screwdriver blade, whereby there is a potential deflection of the slot corners even with the underlying slot size.
- the invention seeks to remedy this.
- the invention is based on the object of providing a screwdriver blade of the type mentioned at the beginning, the blade geometry of which is able to detect a maximized range of screw sizes. It is a further object of the invention to optimally apply force when twisting and to ensure when loosening the recorded screw sizes.
- the main advantage of the invention can be seen in the fact that at least the slotted-head screws with a thread diameter of M1.2 - M 12 can be screwed in and loosened with a single screwdriver blade, i.e. a single screwdriver can increase the screw size on the basis of this non-conclusive range, to replace a total of 11 different screwdrivers, i.e. the VSM sizes 00-9, without having to forego optimal force transmission during the winding process and loosening the screws.
- Another advantage of the invention can be seen in the fact that the geometrical configuration of the blade shape of the screwdriver blade makes the feared slipping out of the slot shape impossible, in particular when screwing in with hand screwdrivers.
- a further advantage of the invention results from the possibility that the screws can be slipped onto the screwdriver blade for a winding in hard-to-reach places, with which it is possible to carry out such a winding without the usual known magnetic or mechanical aids.
- screwdriver blade can be used both in conventional hand-held screwdrivers with a handle part and also as an insert in the various designs of torque screwdrivers.
- FIG. 1 shows an extract from a standard sheet for screws S with a metric thread.
- the screws considered here have a cylinder head with a diameter a1 and a slot with a width n.
- the characteristic values were taken from the standard sheet VSM 13159 and cover, for example, the area between the screws M1.6 to M10. It is known that this standard sheet is based on other continental European standards, for example the DIN standards, which is why it cannot be expected that country-specific screwdrivers should be provided. Nevertheless, in the near future a uniform European standard is to be expected anyway within the framework of a closer EC union. If, according to the task, a screwdriver blade is to be proposed that can cover the entire area ai, i.e.
- the respective slot width is from 0.4 mm to 2.5 mm extends, on the other hand, that the screw head diameter a1 of the associated screws is between 3 mm and 16 mm. Accordingly, a screwdriver equipped with such a blade must have a shovel shape which can be used with both a slot width of 0.4 mm and a slot width of 2.5 mm, taking into account the different cylinder head diameters, such that that the twisting and loosening of the respective screws in the specified area does not damage and / or fray the original Cause slot geometry and prevents slipping out of the slot shape.
- FIG. 3 shows the holistic profile shape of a screwdriver blade, on the basis of the profile shape determined according to FIG. 2.
- the rectangular central part A is determined in each case according to the smallest screw to be grasped, ie according to its slot width n and screw head diameter a1.
- the middle section whose blade geometry has a thickness A2 of 0.4 mm and a width A1 of 3 mm, is intended for an M 1.6 screw.
- the geometry according to FIG. 3 is designed to provide a single-sided, straight blade surface in order to avoid the point-by-line force introduction between the screwdriver blade and the slot shape on all sides.
- the detection of the remaining screws of the underlying area is achieved by the V-shaped thickening C1 and C2, which starts from the middle part, opposite to the straight blade surface.
- the rhomboid profile surfaces of the thickenings C1 and C2 have a constant directional coefficient, which is 17.9 degrees in terms of angle for the underlying area.
- screwdrivers can be provided for a narrower range than the screw range described above, i.e. for the size range 00-9, for example, 2 or 3 screwdriver blades can be used.
- FIG. 4 and 5 show a three-dimensional representation of a screwdriver blade 1 according to the shovel shape according to FIG. 3, the blade in FIG. 5 being shown in use, as is intended to symbolize the position of the screw S.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Polishing Bodies And Polishing Tools (AREA)
- Connection Of Plates (AREA)
- Drilling Tools (AREA)
Abstract
Description
Die vorliegende Erfindung betrifft eine Schraubenzieherklinge gemäss Oberbegriff des Anspruchs 1.The present invention relates to a screwdriver blade according to the preamble of
Zum Einwinden und Lösen von Gewindeschrauben, die mit einem geschlitzten Schraubenkopf charakterisiert sind, mit verschiedenen Durchmessergrössen, braucht es jeweils, will man eine optimale Krafteinleitung zwischen Schraubenzieherklinge und Schraubenköpfen gewährleisten, verschiedene Grössen der Klingenform, d.h., die Schaufelbreite und Schaufeldicke der Klinge des jeweiligen Schraubenziehers muss mit der Schlitzgeometrie des betreffenden Schraubenkopfes in einem optimalen mechanischen Wirkverhältnis stehen. Diese Schlitzgrösse, die abhängig vom Gewindedurchmesser der jeweiligen Schraube ist, geht aus Normblättern hervor. Fur die Schweiz sind die VSM-Normen Üblich anwendbar. Aehnliche Normen existieren auch in anderen Ländern, wobei bezüglich normierter Schrauben internationale angepasste Kennwerte anzutreffen sind. Nach VSM-Normen weist beispielsweise eine M 1,2-Schraube (Metrisches Gewinde) mit einem Gewindeaussendurchmesser von 1,2 mm), sei es für eine Zylinderschraube, Senkschraube, Linsensenkschraube etc, eine Schraubenkopf-Schlitzbreite von 0,3 mm auf; demgegenüber weist eine M 12-Schraube eine Schlitzbreite von 3 mm auf. Zur Abdekkung dieser an sich grossen Bandbreite bräuchte es, soll die angesprochene Krafteinleitung zwischen Schraubenzieher und Schlitz beim Einwinden und Lösen der Schraube optimal vonstatten gehen, und sollen die Schraubenköpfe nach wenigen Einsätzen nicht ausgeschlitzt sein, ein ganzer Satz von nicht weniger als 11 einzel abgestuften Schraubenziehern, die nach VSM mit den Grössen 00-9 gekennzeichnet sind. Die Praxis lehrt indessen, dass selten eine solche Garnitur lückenlos zur Verfügung steht; selbst dann, wenn eine solche Garnitur vorhanden wäre, kann in der Praxis festgestellt werden, dass der Handwerker mit wenigen Schraubenziehern auszukommen pflegt, d.h. die ganze Bandbreite abdeckt, dergestalt, dass selten der der jeweiligen Schlitzbreite zugeordnete Schraubenzieher zum Einsatz gelangt: Eine visuelle Analyse von gebrauchten Schrauben erhärtet das Gesagte, nämlich, dass durchwegs mit zu kleinen Schraubenziehern operiert wird, was dann unweigerlich zum ärgerlichen Resultat führt, dass die Schlitze der Schraubenköpfe mit der Zeit dergestalt ausgefranzt werden, dass nicht selten weder eine Einwindung noch ein Lösen der Schraube noch möglich ist. Diese praxisnahe Beobachtung rührt auch daher, dass es im Werkbetrieb für den Handwerker objektiv mühsam ist, die Zuordnung zwischen dem richtigen Schraubenzieher und der Schlitzgrösse der jeweiligen Schraube fortlaufend vorzunehmen.To thread and loosen threaded screws, which are characterized by a slotted screw head, with different diameter sizes, different sizes of the blade shape are required if you want to ensure optimal force transmission between the screwdriver blade and the screw heads, i.e. the blade width and blade thickness of the blade of the respective screwdriver must be in an optimal mechanical working relationship with the slot geometry of the screw head concerned. This slot size, which depends on the thread diameter of the respective screw, is shown on standard sheets. The VSM standards are usually applicable for Switzerland. Similar standards also exist in other countries, whereby internationally adapted characteristic values can be found with regard to standardized screws. According to VSM standards, for example, an M 1.2 screw (metric thread) with an outer thread diameter of 1.2 mm), be it for a cylinder screw, countersunk screw, pan-head screw, etc., has a screw head slot width of 0.3 mm; on the other hand points an M 12 screw has a slot width of 3 mm. To cover this wide range, the required force transmission between screwdriver and slot should take place optimally when the screw is screwed in and loosened, and the screw heads should not be slashed out after a few uses, a whole set of no fewer than 11 individually graduated screwdrivers marked with sizes 00-9 according to VSM. However, practice teaches that such a set is rarely available without gaps; Even if such a set were available, it can be determined in practice that the craftsman uses only a few screwdrivers, i.e. covers the entire range, in such a way that the screwdriver assigned to the respective slot width is rarely used: A visual analysis of Used screws confirm what has been said, namely that the operation is carried out with screwdrivers that are too small, which inevitably leads to the annoying result that the slots of the screw heads are frayed over time in such a way that it is not uncommon for the screw to neither twist nor loosen is. This practical observation is also due to the fact that it is objectively tedious for the craftsman in the factory to make the assignment between the correct screwdriver and the slot size of the respective screw on an ongoing basis.
Aus US-4,016,912 ist eine Schraubenzieherklinge bekanntgeworden, deren eine Breitseite eine Verdickung aufweist. Geometrisch ist diese Verdickung jeweils von sehr kurzer Ausdehnung ausgestaltet, weshalb sich mit einer solchen Schraubenzieherklinge in der Praxis nur eine Schlitzbreite abdecken lässt. Eine breite Palette von verschiedenen Schlitzgrössen lässt sich mit der vorliegenden Schraubenzieherklinge nicht erfassen, wobei eine Ausschlagung der Schlitzecken selbst bei der zugrundegelegten Schlitzgrösse potentiell vorhanden ist.A screwdriver blade has become known from US Pat. No. 4,016,912, the broad side of which has a thickening. This thickening is geometrically very short, which is why such a screwdriver blade can cover only one slot width in practice. A wide range of different slot sizes cannot be grasped with the present screwdriver blade, whereby there is a potential deflection of the slot corners even with the underlying slot size.
Aus US-4,680,995 ist eine weitere Schraubenzieherklinge bekanntgeworden, welche beidseitig eine bombierte Breitseite aufweist. bei einer solchen geometrischen Ausgestaltung lässt sich die Kraftübertragung nur ecklastig anbringen, was unweigerlich zur Ausschlagung der Schlitzecken führt, und damit zur Zerstörung der krafteinleitenden Geometrie der betroffenen Schraube.Another screwdriver blade has become known from US Pat. No. 4,680,995, which has a convex broad side on both sides. With such a geometrical design, the force transmission can only be applied in a corner-heavy manner, which inevitably leads to the deflection of the slot corners and thus to the destruction of the force-introducing geometry of the screw concerned.
Hier will die Erfindung Abhilfe schaffen. Der Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, liegt die Aufgabe zugrunde, eine Schraubenzieherklinge der eingangs genannten Art bereitzustellen, deren Schaufelgeometrie eine maximierte Bandbreite an Schraubengrössen zu erfassen vermag. Es ist des weiteren Aufgabe der Erfindung, eine optimale Krafteinleitung bei der Einwindung und beim Lösen der erfassten Schraubengrössen zu gewährleisten.The invention seeks to remedy this. The invention, as characterized in the claims, is based on the object of providing a screwdriver blade of the type mentioned at the beginning, the blade geometry of which is able to detect a maximized range of screw sizes. It is a further object of the invention to optimally apply force when twisting and to ensure when loosening the recorded screw sizes.
Die Erfindung löst diese Aufgaben mit den Merkmalen des Anspruchs 1.The invention solves these problems with the features of
Der wesentliche Vorteil der Erfindung ist darin zu sehen, dass mit einer einzigen Schraubenzieherklinge mindestens die Schlitzkopf-Schrauben mit einem Gewindedurchmesser von M1,2 - M 12 eingewindet und gelöst werden können, d.h., ein einziger Schraubenzieher vermag bei dieser zugrundegelegten, schraubengrössenmässig nach oben aber nicht abschliessenden Bandbreite, ganze 11 verschieden grosse Schraubenzieher, also die VSM-Grössen 00-9, zu ersetzen, ohne dabei auf eine optimale Krafteinleitung beim Einwindungsprozess und Lösen der Schrauben verzichten zu müssen. Damit gehören Schlitzkopfschrauben mit ausgefranzten oder ruinierten Schlitzen endgültig der Vergangenheit an.The main advantage of the invention can be seen in the fact that at least the slotted-head screws with a thread diameter of M1.2 - M 12 can be screwed in and loosened with a single screwdriver blade, i.e. a single screwdriver can increase the screw size on the basis of this non-conclusive range, to replace a total of 11 different screwdrivers, i.e. the VSM sizes 00-9, without having to forego optimal force transmission during the winding process and loosening the screws. This means that slotted-head screws with frayed or ruined slots are a thing of the past.
Ein weiterer Vorteil der Erfindung ist darin zu sehen, dass die geometrische Ausgestaltung der Schaufelform der Schraubenzieherklinge das gefürchtete Ausgleiten aus der Schlitzform, insbesondere beim Einwinden von Schrauben mit Hand-Schraubenziehern, verunmöglicht.Another advantage of the invention can be seen in the fact that the geometrical configuration of the blade shape of the screwdriver blade makes the feared slipping out of the slot shape impossible, in particular when screwing in with hand screwdrivers.
Ein weiterer Vorteil der Erfindung ergibt sich aus der Möglichkeit heraus, dass die Schrauben für eine Einwindung an schlecht zugänglichen Stellen auf die Schraubenzieherklinge aufgesteckt werden können, womit diebezüglich ohne die üblichen bekannten magnetischen oder mechanischen Hilfsmittel möglich ist, eine solche Einwindung vorzunehmen.A further advantage of the invention results from the possibility that the screws can be slipped onto the screwdriver blade for a winding in hard-to-reach places, with which it is possible to carry out such a winding without the usual known magnetic or mechanical aids.
Ein weiterer Vorteil der Erfindung ist darin zu sehen, dass die Schraubenzieherklinge sowohl bei gewöhnlichen Hand-Schraubenziehern mit einem Griffteil, als auch als Einsatz bei den verschiedenen Ausführungen von Drehmoment-Schraubenziehern eingesetzt werden kann.Another advantage of the invention can be seen in the fact that the screwdriver blade can be used both in conventional hand-held screwdrivers with a handle part and also as an insert in the various designs of torque screwdrivers.
Vorteilhafte und zweckmässige Weiterbildungen der erfindungs gemässen Aufgabenlösung sind in den weiteren Ansprüchen gekennzeichnet.Advantageous and expedient developments of the task solution according to the invention are characterized in the further claims.
Im folgenden wird anhand der Zeichnung Ausführungsbeispiele der Erfindung näher erläutert. Alle für das unmittelbare Verständnis der Erfindung nicht erforderlichen Elemente sind fortgelassen. In den verschiedenen Figuren sind gleiche Elemente jeweils mit den gleichen Bezugszeichen versehen.Exemplary embodiments of the invention are explained in more detail below with reference to the drawing. All elements not necessary for the immediate understanding of the invention have been omitted. In the different figures, the same elements are provided with the same reference numerals.
Es zeigt;
- Fig. 1
- einen Auszug aus einem Normblatt für Schrauben mit einem metrischen Gewinde und mit einem geschlitzten Schraubenkopf nach VSM-Norm 13159,
- Fig. 2
- eine graphische Darstellung des Verlaufes der Schlitzbreite in Abhängigkeit zum jeweiligen Schraubenkopfdurchmesser,
- Fig. 3
- ein weiteres Profil der Schraubenzieherschaufel,
- Fig. 4
- eine dreidimensionale Darstellung der Schaufelform nach dem Profil gemäss Fig. 3 und
- Fig. 5
- eine dreidimensionale Darstellung der Schaufelform nach dem Profil gemäss Fig. 3, im Einsatz für eine Schraube mittlerer Grösse bezüglich erfasster Bandbreite der schraubenzieherklinge.
- Fig. 1
- an extract from a standard sheet for screws with a metric thread and with a slotted screw head according to VSM standard 13159,
- Fig. 2
- a graphical representation of the course of the slot width as a function of the respective screw head diameter,
- Fig. 3
- another profile of the screwdriver shovel,
- Fig. 4
- a three-dimensional representation of the blade shape according to the profile according to FIGS. 3 and
- Fig. 5
- a three-dimensional representation of the blade shape according to the profile according to FIG. 3, in use for a screw of medium size with respect to the detected bandwidth of the screwdriver blade.
Die Aufstellung nach Fig. 1 zeigt einen Auszug aus einem Normblatt für Schrauben S mit einem metrischen Gewinde. Die hier betrachteten Schrauben haben einen Zylinderkopf mit einem Durchmesser a1 und einem Schlitz von der Breite n. Die Kennwerte sind aus dem Normblatt VSM 13159 entnommen worden und erfassen beispielsweise den Bereich zwischen den Schrauben M1,6 bis M10. Es ist bekannt, dass sich dieses Normblatt an anderen kontinentaleeuropäischen Normen anlehnt, beispielweise an die DIN-Normen, weshalb nicht zu rechnen ist, dass länderspezifische Schraubenzieher vorzusehen sind. Dessen ungeachtet, in nächster Zeit ist ohnehin im Rahmen eines engeren EG-Zusammenschlusses mit einer einheitlichen diesbezüglichen europäischen Norm zu rechnen. Wenn aufgabengemäss eine Schraubenzieherklinge vorzuschlagen ist, die den ganzen Bereich a-i, also alle Normschrauben von M 1,6 bis M 10, zu erfassen vermag, so gilt einerseits zu beachten, dass sich die jeweilige Schlitzbreite von 0,4 mm bis 2,5 mm erstreckt, andererseits, dass der Schraubenkopf-Durchmesser a1 der zugeordneten Schrauben zwischen 3 mm und 16 mm beträgt. Demnach, ein mit einer solchen Klinge ausgestatteter Schraubenzieher muss eine Schaufelform aufweisen, welche sowohl bei einer Schlitzbreite von 0,4 mm als auch bei einer solchen von 2,5 mm, unter Berücksichtigung der unterschiedlichen Zylinderkopf-Durchmesser, satt angesetzt werden kann, dergestalt, dass die Einwindung und Lösen der jeweiligen Schrauben im vorgegebenen Bereich keine Verletzung und/oder Ausfranzung der ursprünglichen Schlitzgeometrie bewirken sowie ein Ausgleiten aus der Schlitzform verhindert.1 shows an extract from a standard sheet for screws S with a metric thread. The screws considered here have a cylinder head with a diameter a1 and a slot with a width n. The characteristic values were taken from the standard sheet VSM 13159 and cover, for example, the area between the screws M1.6 to M10. It is known that this standard sheet is based on other continental European standards, for example the DIN standards, which is why it cannot be expected that country-specific screwdrivers should be provided. Nevertheless, in the near future a uniform European standard is to be expected anyway within the framework of a closer EC union. If, according to the task, a screwdriver blade is to be proposed that can cover the entire area ai, i.e. all standard screws from M 1.6 to M 10, then on the one hand it should be noted that the respective slot width is from 0.4 mm to 2.5 mm extends, on the other hand, that the screw head diameter a1 of the associated screws is between 3 mm and 16 mm. Accordingly, a screwdriver equipped with such a blade must have a shovel shape which can be used with both a slot width of 0.4 mm and a slot width of 2.5 mm, taking into account the different cylinder head diameters, such that that the twisting and loosening of the respective screws in the specified area does not damage and / or fray the original Cause slot geometry and prevents slipping out of the slot shape.
Fig.2 zeigt eine Analyse, die zum Ziel hat, die Abhängigkeit zwischen Schlitzbreite n und Schraubenkopf-Durchmesser a1 des zugrundegelegten Schraubenbereiches zwischen M 1,6 und M 10 geometrisch darzustellen. Die Kurve erfasst dabei im Koordinatensystem nur den ersten Quadranten, was aus Symmetrieüberlegungen vollauf genügt. Auf der Abszisse X wird massstäblich den halben Durchmesser des Zylinderkopfes a1 aufgetragen; auf der Ordinate Y, im selben Massstab, wird die halbe Schlitzbreite der zugehörigen Schraube eingetragen. Verbindet man die daraus entstandenen Schnittstellen miteinander, so stellt man fest, dass praktisch eine Gerade entsteht, wobei die Abschnitte zwischen den einzelnen Schnittstellen einen konstanten Richtungskoeffizient aufweisen. Etwaige kleine Abweichungen können aus extrem gelagerten Toleranzgrenzen entstehen; sie sind aber dermassen vernachlässigbar klein, dass die Wirkungsweise einer nach der erhaltenen Nenngerade ausgelegten Schaufelform der Klinge nicht tangiert wird. Die Fläche Z unterhalb des Verlaufes der Gerade bedeutet sonach jene Teilprofilform, welche die Klinge des Schraubenziehers endseitig aufweisen muss, um den zugrundegelegten Schraubenbereich abdecken zu können.2 shows an analysis with the aim of geometrically representing the relationship between slot width n and screw head diameter a1 of the underlying screw area between M 1.6 and M 10. The curve only records the first quadrant in the coordinate system, which is entirely sufficient for symmetry considerations. The abscissa X plots half the diameter of the cylinder head a1; on the ordinate Y, on the same scale, half the slot width of the associated screw is entered. If you connect the resulting interfaces with each other, you will see that practically a straight line is created, with the sections between the individual interfaces having a constant directional coefficient. Any small deviations can arise from extremely stored tolerance limits; however, they are so negligibly small that the mode of action of a blade shape of the blade designed according to the nominal straight line obtained is not affected. The area Z below the course of the straight line thus means that partial profile shape which the blade of the screwdriver must have at the end in order to be able to cover the underlying screw area.
Fig. 3 zeigt die ganzheitliche Profilform einer Schraubenzieherklinge, aufgrund der ermittelten Profilform nach Fig. 2. Dabei bestimmt sich der rechteckige Mittelteil A jeweils nach der kleinsten zu erfassenden Schraube, d.h. nach deren Schlitzbreite n und Schraubenkopfdurchmesser a1. In unserem Beispiel ist der Mittelteil, dessen Schaufelgeometrie eine Dicke A2 von 0,4 mm und eine Breite A1 von 3 mm aufweist, für eine M 1,6-Schraube bestimmt. Die Geometrie nach Fig. 3 ist daraus ausgelegt, eine einseitige gerade Schaufelfläche zur Verfügung zu stellen, um die allseitige Punkt- ev. Linien-Krafteinleitung zwischen Schraubenzieherklinge und Schlitzform zu umgehen. Die Erfassung der übrigen Schrauben des zugrundegelegten Bereichs wird durch die V-förmige Verdickung C1 und C2 erreicht, die vom Mittelteil, entgegengesetzt zur geraden Schaufelfläche, ausgeht. Die rhomboiden Profilflächen der Verdickung C1 und C2 weisen einen konstanten Richtungskoeffizient auf, der winkelmässig für den zugrundegelegten Bereich bei 17,9 Grade liegt.3 shows the holistic profile shape of a screwdriver blade, on the basis of the profile shape determined according to FIG. 2. The rectangular central part A is determined in each case according to the smallest screw to be grasped, ie according to its slot width n and screw head diameter a1. In our example, the middle section, whose blade geometry has a thickness A2 of 0.4 mm and a width A1 of 3 mm, is intended for an M 1.6 screw. The geometry according to FIG. 3 is designed to provide a single-sided, straight blade surface in order to avoid the point-by-line force introduction between the screwdriver blade and the slot shape on all sides. The detection of the remaining screws of the underlying area is achieved by the V-shaped thickening C1 and C2, which starts from the middle part, opposite to the straight blade surface. The rhomboid profile surfaces of the thickenings C1 and C2 have a constant directional coefficient, which is 17.9 degrees in terms of angle for the underlying area.
Selbstverständlich können Schraubenzieher für einen engeren Bereich als das obere beschriebene Schrauben-Spektrum vorgesehen werden, d.h., für die Bereichgrösse 00-9 können beispielsweise 2 oder 3 Schraubenzieherklingen zugrundegelegt werden.Of course, screwdrivers can be provided for a narrower range than the screw range described above, i.e. for the size range 00-9, for example, 2 or 3 screwdriver blades can be used.
Fig. 4 und 5 zeigen eine dreidimensionale Darstellung einer Schraubenzieherklinge 1 gemäss der schaufelform nach Fig. 3, wobei bei Fig. 5 die Klinge im Einsatz dargestellt ist, wie dies die Stellung der Schraube S versinnbildlichen will.4 and 5 show a three-dimensional representation of a
Claims (4)
- Screwdriver blade, which merges at the end side into a wedge-shaped screwdriver spade which is insertable into a head slot of a screw and is defined by two flank-sided broad sides, the one broad side of the screwdriver spade forming a flat surface, characterized in that the other broad side of the screwdriver spade comprises a middle part (A), the width (A1) and thickness (A2) of which corresponds to the slot width (n) of a screw (S), and in that, in order to encompass a spread of screw sizes, starting from this middle part (A) a respective opposite thickening (C1, C2), running at a constant angle to the flat broad side, is produced.
- Screwdriver blade according to Claim 1, characterized in that the angle of the mutually opposite running thickenings (C1, C2) measures 17.9°.
- Screwdriver blade according to Claim 1, characterized in that the width (A1) and thickness (A2) of the middle part (A) corresponds to the head slot of the smallest screw (S) to be encompassed.
- Screwdriver blade according to Claim 1, characterized in that the width (E) and thickness (F) of the screwdriver spade corresponds to the head slot of the largest screw (S) to be encompassed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH1380/90A CH683078A5 (en) | 1990-04-24 | 1990-04-24 | Screwdriver blade. |
| CH1380/90 | 1990-04-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0453976A1 EP0453976A1 (en) | 1991-10-30 |
| EP0453976B1 true EP0453976B1 (en) | 1995-11-15 |
Family
ID=4209080
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91106288A Expired - Lifetime EP0453976B1 (en) | 1990-04-24 | 1991-04-19 | Screwdriver blade |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0453976B1 (en) |
| AT (1) | ATE130235T1 (en) |
| CH (1) | CH683078A5 (en) |
| DE (1) | DE59106883D1 (en) |
| DK (1) | DK0453976T3 (en) |
| ES (1) | ES2080850T3 (en) |
| GR (1) | GR3018699T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5269209A (en) * | 1992-10-20 | 1993-12-14 | Baker David R | Curvilinear drive screwdriver and screw |
| GB2386854A (en) * | 2002-02-16 | 2003-10-01 | Steven Broadbelt | Diamond Drive Screwdriver System |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR440585A (en) * | 1911-06-16 | 1912-07-13 | Alfred H Eicken | Double concave blade screwdriver |
| GB101151A (en) * | 1915-08-12 | 1917-03-29 | Henry Cole William | |
| US1476653A (en) * | 1922-05-17 | 1923-12-04 | Joseph R Stanton | Screw driver |
| US4016912A (en) * | 1975-12-15 | 1977-04-12 | St Amour Lionel | Screwdriver for slotted head screw |
| US4680995A (en) * | 1986-02-24 | 1987-07-21 | Naphs, Inc. | Screwdriver |
-
1990
- 1990-04-24 CH CH1380/90A patent/CH683078A5/en not_active IP Right Cessation
-
1991
- 1991-04-19 ES ES91106288T patent/ES2080850T3/en not_active Expired - Lifetime
- 1991-04-19 AT AT91106288T patent/ATE130235T1/en not_active IP Right Cessation
- 1991-04-19 EP EP91106288A patent/EP0453976B1/en not_active Expired - Lifetime
- 1991-04-19 DE DE59106883T patent/DE59106883D1/en not_active Expired - Fee Related
- 1991-04-19 DK DK91106288.3T patent/DK0453976T3/en active
-
1996
- 1996-01-17 GR GR960400100T patent/GR3018699T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ATE130235T1 (en) | 1995-12-15 |
| ES2080850T3 (en) | 1996-02-16 |
| GR3018699T3 (en) | 1996-04-30 |
| CH683078A5 (en) | 1994-01-14 |
| DE59106883D1 (en) | 1995-12-21 |
| EP0453976A1 (en) | 1991-10-30 |
| DK0453976T3 (en) | 1996-04-09 |
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