EP0508849B1 - Tool handle, specially for precision screwdrivers, and equivalent tools - Google Patents

Tool handle, specially for precision screwdrivers, and equivalent tools Download PDF

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Publication number
EP0508849B1
EP0508849B1 EP19920400678 EP92400678A EP0508849B1 EP 0508849 B1 EP0508849 B1 EP 0508849B1 EP 19920400678 EP19920400678 EP 19920400678 EP 92400678 A EP92400678 A EP 92400678A EP 0508849 B1 EP0508849 B1 EP 0508849B1
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EP
European Patent Office
Prior art keywords
head
tool handle
handle according
diameter
concave
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
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EP19920400678
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German (de)
French (fr)
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EP0508849A1 (en
Inventor
Hervé Gilbert Gomas
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Facom SA
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Facom SA
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    • G—PHYSICS
    • G04—HOROLOGY
    • G04D—APPARATUS OR TOOLS SPECIALLY DESIGNED FOR MAKING OR MAINTAINING CLOCKS OR WATCHES
    • G04D1/00—Gripping, holding, or supporting devices
    • G04D1/0007—Gripping, holding, or supporting devices for assembly entirely by hand
    • G04D1/0028—Screwdrivers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B25G1/04—Handle constructions telescopic; extensible; sectional
    • B25G1/043—Handle constructions telescopic; extensible; sectional for screwdrivers, wrenches or spanners
    • B25G1/046—Handle constructions telescopic; extensible; sectional for screwdrivers, wrenches or spanners with free-turning section at end of handle remote from tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25G—HANDLES FOR HAND IMPLEMENTS
    • B25G1/00—Handle constructions
    • B25G1/10—Handle constructions characterised by material or shape
    • B25G1/105—Handle constructions characterised by material or shape for screwdrivers, wrenches or spanners

Definitions

  • the present invention relates to a tool handle for a precision screwdriver, of the type comprising a body which has a distal actuating part and which is surmounted by a freely rotating head without edge, this head comprising an enlarged free end forming a bead whose meridian section has a rounded outline, the part of the head adjacent to the body being at least partially delimited, in meridian section, by a concave rounding whose radius is greater than that of the bead and which tangentially connects to the latter, cf. for example CH-A-315 396.
  • Screwdrivers having a tool handle of the aforementioned type have the advantage of decoupling the axial force and the rotational movement thanks to the presence of a freely rotating head.
  • none of the known screwdrivers provides a compromise in comfort / precision of handling which is satisfactory in the three sockets mentioned above.
  • the invention aims to fill this gap. To this end, it relates to a tool handle of the aforementioned type, characterized in that the height of the head is of the same order as its maximum diameter, in that the body has an intermediate bulge at the proximal end of its distal actuating part, and in that the lower end of said rounded concave is located in the extension of the upper end of the body.
  • the invention also relates to a precision screwdriver, equipped with a tool handle as defined above.
  • the precision screwdriver shown in the drawings consists of a handle 1 of elongated shape, with a general axis XX assumed to be vertical, at the lower end (considering FIG. 1) of which a screwdriver rod 2 is fixed coaxially.
  • 1 itself consists of a body 3 on the upper end of which is mounted a ring 4 surmounted by a freely rotating head 5.
  • the head 5 of the screwdriver is traversed axially right through by a bore 18 which comprises from bottom to top three parts with increasing diameters: a lower part of the same diameter as the pin 14 and whose height is slightly less than that of this pin up to shoulder 16; an intermediate part of the same diameter as the head 15 of the tenon 14 and whose height is slightly greater than that of this head; and an upper part slightly larger in diameter than the previous one.
  • the meridian half-section of the head 5 is defined by two arcs of a circle: a concave lower arc 19, of relatively large radius, possibly extended downwards by a short line segment parallel to the axis XX, and an arc of a convex upper circle 20, of considerably smaller radius, which is tangentially connected to the previous one and leads to the upper mouth of the bore 18, a little below the upper extreme plane P of the head 5.
  • the head 5 has an enlarged upper end forming a bead with rounded outline 20.
  • the height of this head is of the same order as its maximum diameter.
  • the head 5 For mounting the head 5, we put everything on first on the ring holder 13 the ring 4, the outside diameter of which is substantially the same as the minimum diameter of the upper part 12 of the body 3. Then the head 5 is forced into the tenon 14, until snapping under the shoulder 16. The head 5 is then freely rotatably mounted on the body 3, with little axial and radial play. Finally, the tool is completed with a pad 21 of the same height as the upper part of the bore 18 and which is force fitted into the latter.
  • the last phalanx of the index finds a stable and comfortable seat on the head 5 with a broad and concave top.
  • the thumb and middle finger can rotate the body 3 at different speeds and with different couples, depending on their position along this body. During this rotation, as the pellet 21 is secured to the head 5, no moving part of the tool is in contact with the index finger.
  • the large and concave head 5 is positioned in a stable and comfortable manner.
  • the bulge 9 provides a well-defined position for wedging the thumb, index and middle fingers, and, in this position, during the rotation of the body, the latter never rubs against the first phalanx of the index finger or the major, no moving part is in contact with the hollow of the index, and thanks to the curved contour 20, no edge or quasi-edge comes to injure the hand. This remains true if, to modify the torque or the screwing / unscrewing speed, the user moves the thumb, index and middle finger along the body 3.
  • the little or ring finger can grip the firm and firm head 5, while being housed in the concave rounding 19. Thanks to this rounding, the screwdriver is well wedged against the palm, without contact between the little finger or the ring finger and the movable body 3.
  • the three driving fingers (thumb, index and middle finger) have at their disposal a net rear setting provided by the bulge 9, while being able to be placed in front of or behind it to adjust the speed and the torque of screwing / unscrewing.
  • the shape of the gougezes 7 offers greater handling comfort than hexagon or vivid groove configurations, without significant loss of movement precision.
  • the full tenon 14-through bore 18 combination makes it possible to obtain both good precision in mounting the head 5, with low clearances which are well controlled, and a high resistance to tearing out of the head 5.
  • the pellet 21 by supplementing the aselage by the pellet 21, one obtains not only the aforementioned advantage of the absence of a rotating part at the top of the tool, but also, in addition to better aesthetics, the possibility of providing this pellet with a tool identification code, for example of a color; this is very convenient when a series of tools is stored on a rack which hides the lower part.
  • the ring 4 can fulfill one or more of the following functions: aesthetics, marking, identification of the tool, friction ring for the rotation of the head 5.
  • head 5 an outside diameter of at least 8 to 9 mm at its base, a maximum diameter of at least 13 to 15 mm, and a height of at least 15 to 16 mm.

Description

La présente invention est relative à un manche d'outil, pour tournevis de précision, du type comprenant un corps qui comporte une partie distale d'actionnement et qui est surmonté d'une tête librement rotative dépourvue d'arête, cette tête comportant une extrémité libre élargie formant un bourrelet dont la section méridienne présente un contour arrondi, la partie de la tête adjacente au corps étant au moins partiellement délimitée, en section méridienne, par un arrondi concave dont le rayon est supérieur à celui du bourrelet et qui se raccorde tangentiellement à ce dernier, cf. par example CH-A-315 396.The present invention relates to a tool handle for a precision screwdriver, of the type comprising a body which has a distal actuating part and which is surmounted by a freely rotating head without edge, this head comprising an enlarged free end forming a bead whose meridian section has a rounded outline, the part of the head adjacent to the body being at least partially delimited, in meridian section, by a concave rounding whose radius is greater than that of the bead and which tangentially connects to the latter, cf. for example CH-A-315 396.

Les tournevis de précision peuvent être manipulés de trois manières principales différentes :

  • (1) en prise "horlogère", l'extrémité de l'index appuie axialement sur la tête, et le couple de rotation est fourni par le pouce et le majeur agissant simultanément sur le corps;
  • (2) en prise "creux d'index", la tête est calée à la racine de l'index, ou bien dans la fourche formée entre l'index et le majeur, et le pouce, l'index et le majeur saisissent le corps; le pouce et le majeur exercent le couple de rotation, tandis que l'index affine le mouvement;
  • (3) en prise "pleine paume", le tournevis est tenu dans la main; l'auriculaire ou l'annulaire plaque la tête de l'outil contre la paume, et le pouce, l'index et le majeur font tourner le corps.
Precision screwdrivers can be handled in three main ways:
  • (1) in "clockwork" engagement, the end of the index finger presses axially on the head, and the torque is supplied by the thumb and middle finger acting simultaneously on the body;
  • (2) in "hollow index finger" socket, the head is wedged at the root of the index finger, or else in the fork formed between the index finger and the middle finger, and the thumb, index finger and middle finger grip the body; the thumb and middle finger exert the torque, while the index finger refines the movement;
  • (3) in "full palm" position, the screwdriver is held in the hand; the little or ring finger presses the head of the tool against the palm, and the thumb, index and middle fingers rotate the body.

Les tournevis ayant un manche d'outil du type précité présentent l'avantage de découpler l'effort axial et le mouvement de rotation grâce à la présence d'une tête librement rotative. Toutefois, aucun des tournevis connus n'apporte un compromis confort/précision de manipulation qui soit satisfaisant dans les trois prises rappelées ci-dessus.Screwdrivers having a tool handle of the aforementioned type have the advantage of decoupling the axial force and the rotational movement thanks to the presence of a freely rotating head. However, none of the known screwdrivers provides a compromise in comfort / precision of handling which is satisfactory in the three sockets mentioned above.

L'invention a pour but de combler cette lacune. A cet effet, elle a pour objet un manche d'outil du type précité, caractérisée en ce que la hauteur de la tête est du même ordre que son diamètre maximal, en ce que le corps présente un renflement intermédiaire à l'extrémité proximale de sa partie distale d'actionnement, et en ce que l'extrémité inférieure dudit arrondi concave se trouve dans le prolongement de l'extrémité supérieure du corps.The invention aims to fill this gap. To this end, it relates to a tool handle of the aforementioned type, characterized in that the height of the head is of the same order as its maximum diameter, in that the body has an intermediate bulge at the proximal end of its distal actuating part, and in that the lower end of said rounded concave is located in the extension of the upper end of the body.

Suivant d'autres caractéristiques :

  • la face d'extrémité libre de la tête est plane, ou dans l'ensemble concave;
  • le corps a un diamètre progressivement croissant de son extrémité adjacente à la tête au sommet du renflement;
  • le corps a un diamètre progressivement décroissant du renflement à son extrémité opposée à la tête;
  • dans sa partie opposée à la tête, le corps présente des gougeures longitudinales peu profondes, relativement larges, notamment à fond arrondi;
  • la tête est traversée de part en part par un alésage axial qui présente un épaulement d'encliquetage sur un tenon plein solidaire du corps;
  • la tête comporte un diamètre extérieur d'au moins 8 à 9 mm à sa base, un diamètre maximal d'au moins 13 à 15 mm, et une hauteur d'au moins 15 à 16 mm.
According to other characteristics:
  • the free end face of the head is flat, or in the concave assembly;
  • the body has a progressively increasing diameter from its end adjacent to the head at the top of the bulge;
  • the body has a progressively decreasing diameter of the bulge at its end opposite the head;
  • in its part opposite to the head, the body has relatively deep longitudinal gougers, particularly with a rounded bottom;
  • the head is traversed right through by an axial bore which has a latching shoulder on a solid stud secured to the body;
  • the head has an outside diameter of at least 8 to 9 mm at its base, a maximum diameter of at least 13 to 15 mm, and a height of at least 15 to 16 mm.

L'invention a également pour objet un tournevis de précision, équipé d'un manche d'outil tel que défini ci-dessus.The invention also relates to a precision screwdriver, equipped with a tool handle as defined above.

Un exemple de réalisation de l'invention va maintenant être décrit en regard du dessin annexé, sur lequel :

  • la Figure 1 est une vue, partiellement en coupe longitudinale, d'un tournevis de précision conforme à l'invention; et
  • la Figure 2 est une prise en coupe transversale suivant la ligne II-II de la Figure 1.
An embodiment of the invention will now be described with reference to the attached drawing, in which:
  • Figure 1 is a view, partially in longitudinal section, of a precision screwdriver according to the invention; and
  • Figure 2 is a cross-section taken along line II-II of Figure 1.

Le tournevis de précision représenté aux dessins est constitué d'un manche 1 de forme allongée, d'axe général X-X supposé vertical, à l'extrémité inférieure (en considérant la Figure 1) duquel est fixée coaxialement une tige de tournevis 2. Le manche 1 est lui-même constitué d'un corps 3 sur l'extrémité supérieure duquel est montée une bague 4 surmontée d'une tête 5 librement rotative.The precision screwdriver shown in the drawings consists of a handle 1 of elongated shape, with a general axis XX assumed to be vertical, at the lower end (considering FIG. 1) of which a screwdriver rod 2 is fixed coaxially. 1 itself consists of a body 3 on the upper end of which is mounted a ring 4 surmounted by a freely rotating head 5.

De bas en haut, le corps 3, constitué d'une pièce moulée monobloc, comprend :

  • une partie inférieure mince 6 tronconique, s'évasant légèrement vers le haut et s'étendant sur à peu près la moitié de la hauteur du corps 3. Sur l'essentiel de sa hauteur, cette partie 6 présente des gougeures 7. Chaque gougeure est un évidement peu profond, relativement large, à fond concave défini par l'intersection d'un cylindre d'axe parallèle à l'axe X-X avec le cône qui délimite la partie 6. Du fait de cette définition, la profondeur et la largeur des gougeures augmentent progressivement de bas en haut. A leur extrémité supérieure, définie par un arrondi 8, les gougeures ont une largeur du même ordre que leur espacement mutuel;
  • un renflement intermédiaire 9 à section méridienne en S allongé, comportant un arc de cercle inférieur concave 10 qui se raccorde tangentiellement à l'extrémité supérieure de la partie 6, et un arc de cercle supérieur convexe 11 qui se raccorde tangentiellement à l'arc 10; et
  • une partie supérieure épaisse 12 tronconique, convergeant vers le haut, qui se raccorde tangentiellement à l'extrémité supérieure de l'arc de cercle 11. Le plus petit diamètre de cette partie 12 est supérieur au plus grand diamètre de la partie 6;
  • un porte-bague cylindrique 13, de même hauteur que la bague 4 et coiffé avec un léger jeu radial par celle-ci, en saillie sur la tranche d'extrémité supérieure plane de la partie 12; et
  • en saillie sur la tranche d'extrémité supérieure plane du porte-bague 13, un tenon cylindrique plein 14 à tête 15 légèrement élargie, définissant un épaulement d'encliquetage 16 dirigé vers le bas et une surface supérieure bombée 17.
From bottom to top, the body 3, consisting of a one-piece molded part, comprises:
  • a thin frustoconical lower part 6, flaring slightly upwards and extending over approximately half the height of the body 3. Over most of its height, this part 6 has gougers 7. Each gougeure is a relatively deep, shallow recess with a concave bottom defined by the intersection of a cylinder with an axis parallel to the axis XX with the cone which delimits part 6. As a result of this definition, the depth and width of the gougers gradually increase from bottom to top. At their upper end, defined by a rounded 8, the gougers have a width of the same order as their mutual spacing;
  • an intermediate bulge 9 with an elongated S meridian section, comprising a concave lower arc of a circle 10 which is tangentially connected to the upper end of the part 6, and a convex upper arc of a circle 11 which is tangentially connected to the arc 10 ; and
  • a thick frusto-conical upper part 12, converging upwards, which connects tangentially to the upper end of the arc of a circle 11. The smallest diameter of this part 12 is greater than the largest diameter of the part 6;
  • a cylindrical ring holder 13, of the same height as the ring 4 and capped with a slight radial clearance by the latter, projecting from the flat upper end edge of the part 12; and
  • projecting from the flat upper end edge of the ring holder 13, a solid cylindrical tenon 14 with slightly enlarged head 15, defining a latching shoulder 16 directed downwards and a domed upper surface 17.

La tête 5 du tournevis est traversée axialement de part en part par un alésage 18 qui comporte de bas en haut trois parties à diamètres croissants : une partie inférieure de même diamètre que le tenon 14 et dont la hauteur est légèrement inférieure à celle de ce tenon jusqu'à l'épaulement 16; une partie intermédiaire de même diamètre que la tête 15 du tenon 14 et dont la hauteur est légèrement supérieure à celle de cette tête; et une partie supérieure de diamètre légèrement supérieur au précédent.The head 5 of the screwdriver is traversed axially right through by a bore 18 which comprises from bottom to top three parts with increasing diameters: a lower part of the same diameter as the pin 14 and whose height is slightly less than that of this pin up to shoulder 16; an intermediate part of the same diameter as the head 15 of the tenon 14 and whose height is slightly greater than that of this head; and an upper part slightly larger in diameter than the previous one.

Extérieurement, la demi-section méridienne de la tête 5 est définie par deux arcs de cercle : un arc de cercle inférieur concave 19, de rayon relativement grand, éventuellement prolongé vers le bas par un court segment de droite parallèle à l'axe X-X, et un arc de cercle supérieur convexe 20, de rayon nettement plus petit, qui se raccorde tangentiellement au précédent et aboutit à l'embouchure supérieure de l'alésage 18, un peu au-dessous du plan extrême supérieur P de la tête 5. Ainsi, la tête 5 comporte une extrémité supérieure élargie formant un bourrelet à contour arrondi 20. La hauteur de cette tête est du même ordre que son diamètre maximal.Externally, the meridian half-section of the head 5 is defined by two arcs of a circle: a concave lower arc 19, of relatively large radius, possibly extended downwards by a short line segment parallel to the axis XX, and an arc of a convex upper circle 20, of considerably smaller radius, which is tangentially connected to the previous one and leads to the upper mouth of the bore 18, a little below the upper extreme plane P of the head 5. Thus , the head 5 has an enlarged upper end forming a bead with rounded outline 20. The height of this head is of the same order as its maximum diameter.

Pour le montage de la tête 5, on enfile tout d'abord sur le porte-bague 13 la bague 4, dont le diamètre extérieur est sensiblement le même que le diamètre minimal de la partie supérieure 12 du corps 3. Puis on enfonce à force la tête 5 sur le tenon 14, jusqu'à encliquetage sous l'épaulement 16. La tête 5 est alors montée librement rotative sur le corps 3, avec un faible jeu axial et radial. Enfin, on complète l'outil avec une pastille 21 de même hauteur que la partie supérieure de l'alésage 18 et que l'on emboîte à force dans cette dernière.For mounting the head 5, we put everything on first on the ring holder 13 the ring 4, the outside diameter of which is substantially the same as the minimum diameter of the upper part 12 of the body 3. Then the head 5 is forced into the tenon 14, until snapping under the shoulder 16. The head 5 is then freely rotatably mounted on the body 3, with little axial and radial play. Finally, the tool is completed with a pad 21 of the same height as the upper part of the bore 18 and which is force fitted into the latter.

Le tournevis ainsi décrit peut s'utiliser avec beaucoup de précision et de confort dans l'une quelconque des trois prises mentionnées plus haut.The screwdriver thus described can be used with great precision and comfort in any of the three sockets mentioned above.

En prise "horlogère", la dernière phalange de l'index trouve une assise stable et confortable sur la tête 5 à sommet large et concave. Le pouce et le majeur peuvent faire tourner le corps 3 à différentes vitesses et avec différents couples, suivant leur position le long de ce corps. Pendant cette rotation, comme la pastille 21 est solidaire de la tête 5, aucune partie mobile de l'outil ne se trouve au contact de l'index.In the "horological" position, the last phalanx of the index finds a stable and comfortable seat on the head 5 with a broad and concave top. The thumb and middle finger can rotate the body 3 at different speeds and with different couples, depending on their position along this body. During this rotation, as the pellet 21 is secured to the head 5, no moving part of the tool is in contact with the index finger.

En prise "creux d'index", de nouveau, la tête 5 large et concave se positionne de façon stable et confortable. Le renflement 9 fournit une posittion bien définie de calage du pouce, de l'index et du majeur, et, dans cette position, pendant la rotation du corps, celui-ci ne vient jamais frotter contre la première phalange de l'index ni du majeur, aucune partie mobile n'est au contact du creux d'index, et grâce au contour courbe 20, aucune arête ou quasi-arête ne vient blesser la main. Ceci reste vrai si, pour modifier le couple ou la vitesse de vissage/dévissage, l'utilisateur déplace le pouce, l'index et le majeur le long du corps 3.In the "hollow index" position, again, the large and concave head 5 is positioned in a stable and comfortable manner. The bulge 9 provides a well-defined position for wedging the thumb, index and middle fingers, and, in this position, during the rotation of the body, the latter never rubs against the first phalanx of the index finger or the major, no moving part is in contact with the hollow of the index, and thanks to the curved contour 20, no edge or quasi-edge comes to injure the hand. This remains true if, to modify the torque or the screwing / unscrewing speed, the user moves the thumb, index and middle finger along the body 3.

En prise "pleine paume", l'auriculaire ou l'annulaire peut saisir de manière ferme et stable la tête 5, en se logeant dans l'arrondi concave 19. Grâce à cet arrondi, le tournevis est bien calé contre la paume, sans contact entre l'auriculaire ou l'annulaire et le corps mobile 3. Les trois doigts moteurs (pouce, index et majeur) ont à leur disposition un calage arrière net fourni par le renflement 9, tout en pouvant se placer en avant ou en arrière de celui-ci pour ajuster la vitesse et le couple de vissage/dévissage.In the "full palm" position, the little or ring finger can grip the firm and firm head 5, while being housed in the concave rounding 19. Thanks to this rounding, the screwdriver is well wedged against the palm, without contact between the little finger or the ring finger and the movable body 3. The three driving fingers (thumb, index and middle finger) have at their disposal a net rear setting provided by the bulge 9, while being able to be placed in front of or behind it to adjust the speed and the torque of screwing / unscrewing.

Il est à noter également que la forme des gougeures 7 offre un confort de manipulation supérieur aux configurations six-pans ou à cannelures vives, sans perte notable de précision du mouvement.It should also be noted that the shape of the gougezes 7 offers greater handling comfort than hexagon or vivid groove configurations, without significant loss of movement precision.

Par ailleurs, la combinaison tenon plein 14-alésage traversant 18 permet d'obtenir à la fois une bonne précision du montage de la tête 5, avec de faibles jeux bien maîtrisés, et une résistance à l'arrachement élevée de la tête 5. De plus, en complétant l'asélage par la pastille 21, on obtient non seulement l'avantage précité d'absence de partie tournante au sommet de l'outil, mais également, outre une meilleure esthétique, la possibilité de munir cette pastille d'un code, par exemple d'une couleur, d'identification de l'outil; ceci est très commode lorsqu'une série d'outils est rangée sur un ratelier qui en cache la partie inférieure.Furthermore, the full tenon 14-through bore 18 combination makes it possible to obtain both good precision in mounting the head 5, with low clearances which are well controlled, and a high resistance to tearing out of the head 5. more, by supplementing the aselage by the pellet 21, one obtains not only the aforementioned advantage of the absence of a rotating part at the top of the tool, but also, in addition to better aesthetics, the possibility of providing this pellet with a tool identification code, for example of a color; this is very convenient when a series of tools is stored on a rack which hides the lower part.

La bague 4 peut remplir une ou plusieurs des fonctions suivantes : esthétique, marquage, identification de l'outil, bague de frottement pour la rotation de la tête 5.The ring 4 can fulfill one or more of the following functions: aesthetics, marking, identification of the tool, friction ring for the rotation of the head 5.

Pour obtenir l'agrément optimal en prises "creux d'index" et "pleine paume", et également une rigidité suffisante du manche, on adoptera de préférence, pour la tête 5, un diamètre extérieur d'au moins 8 à 9 mm à sa base, un diamètre maximal d'au moins 13 à 15 mm, et une hauteur d'au moins 15 à 16 mm.To obtain optimal approval in "hollow index" and "full palm" grips, and also sufficient rigidity of the handle, it is preferable to adopt, for head 5, an outside diameter of at least 8 to 9 mm at its base, a maximum diameter of at least 13 to 15 mm, and a height of at least 15 to 16 mm.

Claims (8)

  1. Tool handle for a precision screwdriver of the type comprising a body (3) having a distal actuating part (6) and which is surmounted by an edge-free, freely rotatable head (5), which has a widened free end forming a bead, whose meridian section has a rounded contour (20), the portion of the head (5) adjacent to the body (3) being at least partly defined, in meridian section, by a concave rounded portion (19), whose radius is greater than that of the bead (20) and which is tangentially connected to the latter, characterized in that the height of the head is of the same order of magnitude as its maximum diameter, that the body (3) has an intermediate bulge (9) at the proximal end of its distal actuating part (6) and that the lower end of the concave rounded portion (19) is located in the extension of the upper end of the body (3).
  2. Tool handle according to claim 1, characterized in that the free end face of the head is planar or concave overall.
  3. Tool handle according to claim 1 or 2, characterized in that the body (3) has a progressively increasing diameter from its end adjacent to the head (5) to the apex of the bulge (9).
  4. Tool handle according to any one of the claims 1 to 3, characterized in that the body (3) has a progressively decreasing diameter from the bulge (9) to its end opposite to the head (5).
  5. Tool handle according to any one of the claims 1 to 4, characterized in that, in its portion opposite to the head (5), the body has relatively wide, not very deep, longitudinal gouged portions (7), in particular with a rounded bottom.
  6. Tool handle according to any one of the claims 1 to 5, characterized in that the head (5) is completely traversed by an axial bore (18), which has a ratching shoulder (16) on a solid tenon (14) integral with the body (3).
  7. Tool handle according to any one of the claims 1 to 6, characterized in that the head (5) has an external diameter of at least 8 to 9 mm at its base, a maximum diameter of at least 13 to 15 mm and a height of at least 15 to 16 mm.
  8. Precision screwdriver having a tool handle (1) according to any one of the claims 1 to 7.
EP19920400678 1991-04-12 1992-03-13 Tool handle, specially for precision screwdrivers, and equivalent tools Expired - Lifetime EP0508849B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9104526 1991-04-12
FR9104526A FR2675069B1 (en) 1991-04-12 1991-04-12 TOOL HANDLE, PARTICULARLY FOR PRECISION SCREWDRIVERS, AND CORRESPONDING TOOL.

Publications (2)

Publication Number Publication Date
EP0508849A1 EP0508849A1 (en) 1992-10-14
EP0508849B1 true EP0508849B1 (en) 1995-09-20

Family

ID=9411793

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920400678 Expired - Lifetime EP0508849B1 (en) 1991-04-12 1992-03-13 Tool handle, specially for precision screwdrivers, and equivalent tools

Country Status (5)

Country Link
EP (1) EP0508849B1 (en)
JP (1) JPH05104452A (en)
DE (1) DE69204883T2 (en)
ES (1) ES2077365T3 (en)
FR (1) FR2675069B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29702884U1 (en) * 1997-02-19 1998-06-18 Werner Hermann Wera Werke Fine screwdriver
DE29803967U1 (en) * 1998-03-07 1998-04-23 Holland Letz Felo Werkzeug Tool handle, especially for electronic screwdrivers and similar devices
WO2001074543A1 (en) * 2000-04-05 2001-10-11 Ofentavsek Tone Precision screw-driver with a rotary cap
ITMC20010105A1 (en) * 2001-11-05 2003-05-05 Piergiacomi Sud Srl PRECISION SCREWDRIVER
WO2009042160A1 (en) * 2007-09-24 2009-04-02 Surgivision, Inc. Surgical marking tools and methods for marking a patient

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7045986U (en) * Belzer-Werk R Belzer Screwdriver especially for watchmakers and precision engineering
US922080A (en) * 1907-11-04 1909-05-18 Kendrick & Davis Micrometer screw-driver.
US2351705A (en) * 1942-12-09 1944-06-20 Prall Gustav Screw driver
CH315396A (en) * 1954-05-07 1956-08-15 Coultre Maurice Le Screwdriver
FR2603829B1 (en) * 1986-09-12 1990-06-22 Lupo Rocco HANDLE FOR A HAND TOOL, ESPECIALLY A SCREWDRIVER AND A METHOD FOR MANUFACTURING SUCH A HANDLE
ES2048248T3 (en) * 1988-09-10 1994-03-16 Werner Hermann Wera Werke PRECISION SCREWDRIVER.
DE9012419U1 (en) * 1990-08-30 1990-12-06 Lin, Ching-Jou, Wu-Jih Hsiang, Taichung, Tw

Also Published As

Publication number Publication date
JPH05104452A (en) 1993-04-27
DE69204883T2 (en) 1996-05-15
EP0508849A1 (en) 1992-10-14
DE69204883D1 (en) 1995-10-26
FR2675069B1 (en) 1995-07-07
ES2077365T3 (en) 1995-11-16
FR2675069A1 (en) 1992-10-16

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