EP1718479A2 - Mechanism for writing instrument and writing instrument comprising same - Google Patents

Mechanism for writing instrument and writing instrument comprising same

Info

Publication number
EP1718479A2
EP1718479A2 EP05730727A EP05730727A EP1718479A2 EP 1718479 A2 EP1718479 A2 EP 1718479A2 EP 05730727 A EP05730727 A EP 05730727A EP 05730727 A EP05730727 A EP 05730727A EP 1718479 A2 EP1718479 A2 EP 1718479A2
Authority
EP
European Patent Office
Prior art keywords
guide
lug
elastic member
recess
writing instrument
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.)
Withdrawn
Application number
EP05730727A
Other languages
German (de)
French (fr)
Inventor
Franck Rolion
Hugues Hannequin
Anthony M. Wlodarczyk
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.)
BIC SA
Original Assignee
BIC SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BIC SA filed Critical BIC SA
Publication of EP1718479A2 publication Critical patent/EP1718479A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K7/00—Ball-point pens
    • B43K7/12—Ball-point pens with retractable ball points
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K24/00—Mechanisms for selecting, projecting, retracting or locking writing units
    • B43K24/02—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions
    • B43K24/06—Mechanisms for selecting, projecting, retracting or locking writing units for locking a single writing unit in only fully projected or retracted positions operated by turning means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43K—IMPLEMENTS FOR WRITING OR DRAWING
    • B43K24/00—Mechanisms for selecting, projecting, retracting or locking writing units

Definitions

  • the present invention relates to a mechanism intended in particular for a writing instrument. More particularly the invention relates to a mechanism comprising: - a first element which comprises a guide extending between a first and a second substantially parallel edges; - A second element comprising a lug extending in the guide and movable along said guide, said lug having a given width in the transverse direction of the guide; and - at least one device for locking said lug.
  • Many writing instruments include such a mechanism for removing or retracting a writing point which is most often a ball point.
  • the guide also called a cam path, is produced in the form of a groove or a slot.
  • the guide can be helical, as in the document FR-A-2 809 671, in order to transform a pivoting movement of one of the parts of the body into translational movement of the tip along the longitudinal axis of the instrument.
  • To lock the writing tip in the extended and / or retracted position it is known to form an elbow or a recess, in which the lug of the second element of the mechanism is housed.
  • the lug can generally come out quite easily from this housing, for example when you release the pen from a low height or when you press too hard on the tip.
  • These mechanisms can also give an unpleasant feeling of play due to the freedom of movement of the lug in the housing.
  • the guide extends generally in the longitudinal direction, the mechanism then being controlled by a push button. For these latter mechanisms, the guide can be terminated by a heart-shaped path in which the lug is trapped between two actions exerted on the button.
  • the present invention aims to overcome the drawbacks mentioned above, by providing a mechanism which can be locked and unlocked in at least one position, in a safe and comfortable manner, if possible without increasing the manufacturing cost.
  • the invention relates to a mechanism of the aforementioned type, characterized in that the locking device comprises' a recess extending in the first edge of the guide between a first and a second end, and an elastic member which extends opposite the recess from at least a first base integral with the first end of the recess, up to a vertex arranged in the guide at a distance from the second edge which is less than the width of the lug , said organ elastic being capable of being pushed towards the recess during the passage of the lug.
  • the force required to position the lug of the second element on one side or the other of the locking device depends on the restoring force of the elastic member and on the profile thereof.
  • the locking force is constant, whether the locking device is used for the extended or retracted position of the tip, even for pens having substantially different geometries.
  • the recess allows the elastic member to be erased during the passage of the lug, and consequently the width of this lug can be very close to the width of the guide, which limits the play and improves comfort.
  • the base of the elastic member extends in the extension of the first edge , in order to reduce the possibility of lug play at the locking device;
  • the elastic member has a second base secured to the second end of the recess, to avoid catching the lug regardless of its direction of movement;
  • the elastic member has an intermediate U-shaped portion, the ends of the branches of the ⁇ being respectively secured to the first and second bases, and the top of the elastic member being formed by the base of the U.
  • the first base has a substantially different length the length of the second base, so that the unlocking force is different from the locking force;
  • the guide has at least one end stop extending between the first and second edges, the locking device being arranged at a distance from the stop, which adapted so that the elastic member is in engagement with the lug when the latter is in abutment against the said end stop, in order to immobilize the lug between the latter and the elastic member;
  • the first element and the locking device are formed in one piece of plastic material obtained by molding, in order to reduce the manufacturing costs.
  • the present invention also relates to a writing instrument comprising a tubular body having a front end provided with an opening, a writing tip movable between a storage position in which the tip is arranged in the body and a position of writing in which the tip passes through the opening, and a mechanism as defined above, which controls the passage from one of the positions of the tip to the other position.
  • the body comprises a first tubular part and a second tubular part pivotally mounted relative to the first part, the first element of the mechanism being driven in rotation by said first part, the second element of the mechanism being movable in translation relative to said second part, and the guide of the mechanism being helical, in order to transform the pivoting movement of one part of the body with respect to the other into the movement for exiting or retracting the writing tip;
  • the helical guide has a stop end proximal to the opening, a stop distal end, a first locking device arranged near the proximal end, and a second locking device arranged near the distal end, the locking being thus achieved only using the first and second elements of the mechanism;
  • a movable member connected to the tip forms the second element of the mechanism, the first part of the body forming the first element of the mechanism, and the second part having a housing cooperating with the movable member and adapted to guide
  • FIG. 1 is an exploded view of an instrument d writing comprising a mechanism produced according to the invention
  • - Figure 2 is a simplified sectional view of the writing instrument shown in Figure 1
  • - Figure 3 is an enlarged partial view of an element of the instrument shown in Figure 1.
  • Figure 1 is shown an exploded view of a writing instrument 1 type ballpoint pen with retractable tip.
  • the pen has an external body comprising a front point 2 provided with an opening, a first part 3 forming the front portion of the pen and a second part 4 forming the rear portion.
  • a cartridge 5 having a ball point 6 is slidably mounted through the opening of the point 2. As can be seen better in FIG. 2, the cartridge
  • the first part 3 of the body has at the rear a portion 7 of reduced diameter which penetrates inside the second tubular part 4 when the pen is assembled.
  • the rear portion 7 forms a first element of the mechanism making it possible to exit or retract the writing tip 6.
  • This first element 7 comprises a guide 9 delimited laterally by a first edge 11 and a second edge 12 which extend parallel to the one to the other along a helical line.
  • the movable member 8 constitutes a second element of the mechanism which comprises a lug 13.
  • the lug 13 extends in the guide 9 and can slide along the guide 9.
  • the first element 7 is tubular and the guide 9 forms a helical slot which passes through this element.
  • it could be a helical groove.
  • the movable member 8 has a cylindrical outer face of diameter adapted to penetrate into the first element 7, the lug 13 extending radially relative to this cylindrical outer face.
  • the movable member 8 has at its front end a recess 14 which facilitates the insertion of the lug in the guide 9.
  • the first element 7 comprises first and second locking devices (15,16).
  • the locking device 15 comprises a recess 17 which extends in the first edge 11 of the guide between a first end 17a and a second end 17b.
  • the recess 17 has the shape of an oblong hole passing through the wall of the first element 7, but it could be a simple hollow, especially in the case where the guide 9 is formed by a groove .
  • the locking device 15 further comprises an elastic member 18 which extends opposite the recess 17.
  • the elastic member comprises a first base 19 secured to the first end 17a, a second base 20 secured to the second end 17b and a crown 21 constituted by the base of an intermediate portion 22 in U whose ends of the branches is integral with the first and second bases (19, 20).
  • the apex 21 is arranged in the guide 9 at a distance from the second edge 12 which must be less than the width of the lug, this length being measured along an axis substantially perpendicular to the edges (11, 12).
  • the user can then increase the force exerted on a control member driving the second element 8 so that the pressure exerted by the lug on the intermediate portion 22 is greater than the elastic return force of the member 18.
  • the member elastic 18 is then pushed back into the recess 17 whose dimensions must be adapted to allow erasure of the top 21.
  • the elastic member returns to its position after the passage of the lug.
  • the intermediate portion 22 of the elastic member thus forms a locking point along the guide 9, which requires a determined force to be crossed. Note that this force depends essentially on the shape of the elastic member 18 and the profile of the lug 13, but which is not influenced by other elements of the pen, such as for example a spring which can be more or less compressed.
  • the first and second bases (19, 20) and the intermediate portion 22 form a bridge above the recess, but it is possible that the intermediate portion 22 is only connected to the first edge 11 by a single base, for example the first base 19, and that the intermediate portion 22 extends as close to the second end 17b.
  • the bridge-shaped structure makes it possible to control more precisely the force necessary to push the elastic member 18 into the recess, and prevents the elastic member from getting across the guide 9, which could prevent crossing the locking point.
  • the first and second bases (19, 20) extend in the extension of the first edge 11 so as to form a continuous surface on which the lug can slide smoothly.
  • the guide 9 is closed at its ends by stops, a proximal stop 25 longitudinally located on the side of the writing tip 6 and an opposite stop 26 called distal.
  • a proximal stop 25 longitudinally located on the side of the writing tip 6 and an opposite stop 26 called distal.
  • the portion intermediate 22 of the elastic member 18 is located at a distance from the end stop 25 such that the elastic member 18 is in engagement with the lug 13 when the latter is in abutment against the stop 25.
  • this immobilization is obtained by a point of contact between the elastic member 18 and the lug 13, and a point of contact between the movable member 8 and a stop forming part of the second part 4 of the body.
  • the first base 19 extends in the extension of the edge 11 over a greater distance than the second base 20, so that the first base 19 has greater elasticity.
  • This arrangement facilitates the tilting of the intermediate portion 22 towards the first base 19, so that the force required to bring the lug 13 into the position shown in Figure 3 is less than the force required to leave this position. In other words, it is easier to lock the mechanism than to unlock it, which increases the reliability of the locking without deteriorating the comfort of use.
  • the second locking device 16 has a structure identical to that of the first device 15 and is arranged in a similar manner relative to the distal end stop 26.
  • This second locking device will not be more detailed, but it will be noted that it allows the writing tip 6 to be locked in the retracted position while the first locking device 15 locks the tip in the extended position.
  • the first element 7 of the mechanism comprising the first and second locking devices (15, 16) and the guide 9 and the first part 3 of the body are formed in one piece.
  • This part can be of any known plastic material which has adequate elasticity properties.
  • the part forming the first element of the mechanism and the first part of the body is produced by injecting plastic material into a mold.
  • the mechanism described above lends itself particularly well to the production of a writing instrument the output / retraction of which is controlled by pivoting of a first part of the body relative to one or more other parts of the body.
  • the second part 4 of the body is engaged on the rear portion 7 of the first part 3 so as to be able to pivot relative to the latter over an angular range of approximately 180 °.
  • Peripheral beads 28 formed on the rear portion 7 engage with corresponding grooves formed on the inner face of the second part 4, so as to prevent any relative movement along the longitudinal axis X.
  • the movable member 8 has one end rear 30 of non-cylindrical cross section, for example having opposite flats.
  • the rear part 4 comprises a housing 31 extending along the longitudinal axis and whose cross section corresponds substantially to the cross section of the rear end 30, so that the latter can slide in the rear part 4 along the longitudinal axis X.
  • the user creates a pivoting between the first part 3 and the second part 4 of the body, over approximately a half-turn.
  • the movable member 8 which is rotated by the second part 4, performs a forward or backward movement due to the cooperation of the lug 13 with the guide 9.
  • the mechanism approaches the extended position or the retracted position, the user passes a hard point which indicates that the pen is locked in writing or storage position. Once in one or other of these positions reached, the writing tip is immobilized and only a torque exerted between the first and second parts (3, 4), sufficient to overcome the restoring force of the locking device 15 or 16, allows to leave the storage position or exit of the tip.
  • the first element 7 of the mechanism is an integral part of the first part 3 of the body, the number of parts constituting the pen is reduced. In the embodiment shown, there are five of these parts, but it would be possible to make a pen only in 3 parts by integrating the tip 2 with the first part 3 and by integrally forming the movable member 8 with the cartridge 5. Consequently, the embodiment described above makes it possible to produce a particularly inexpensive writing article whose number of assembly operations is limited.
  • first and second elements (7, 8) could be separate from the parts 3 and 4 forming the body, and even be connected to the latter by means of additional parts such as sleeves.
  • the mechanism comprising the movable member 8 and the portion rear 7 provided with the guide 9 can be used in the field of writing instruments not only to exit and retract a writing tip, but also to control the movement of other organs. For example, using such a mechanism it is possible to control the movement of an eraser, a mine advancing device or the combined movement of a writing tip and a member shutter the opening of the body.

Landscapes

  • Mechanical Pencils And Projecting And Retracting Systems Therefor, And Multi-System Writing Instruments (AREA)
  • Pens And Brushes (AREA)

Abstract

The invention concerns a mechanism for writing instrument comprising: a first component (7) including a guide (9) extending between first and second parallel edges; a second component (8) including a pin (13) extending into the guide and mobile along said guide, the pin having a given width along the transverse direction of the guide; and a device (16) for locking the pin. The locking device comprises a recess extending into a first edge between two ends, and an elastic member which extends opposite the recess from at least a first base integral with the first end of the recess to a summit arranged in the guide spaced apart from the second edge which is shorter than the width of the pin, the elastic member being capable of being thrust back towards the recess when the pin passes through. The invention also concerns a writing instrument comprising said mechanism.

Description

MECANISME POUR INSTRUMENT D'ECRITURE, ET INSTRUMENT D'ECRITURE COMPRENANT UN TEL MECANISME MECHANISM FOR WRITING INSTRUMENT, AND WRITING INSTRUMENT COMPRISING SUCH A MECHANISM
La présente invention se rapporte à un mécanisme destiné notamment à un instrument d'écriture. Plus particulièrement l'invention se rapporte à un mécanisme comprenant : - un premier élément qui comprend un guide s'étendant entre un premier et un deuxième bords sensiblement parallèles ; - un deuxième élément comportant un ergot s'étendant dans le guide et mobile le long dudit guide, ledit ergot présentant une largeur donnée selon la direction transversale du guide ; et - au moins un dispositif de verrouillage dudit ergot. De nombreux instruments d'écriture comportent un tel mécanisme pour sortir ou rétracter une pointe d'écriture qui est le plus souvent une pointe à bille. Dans ces mécanismes, le guide, appelé aussi chemin de came, est réalisé sous forme d'une rainure ou d'une fente. Le guide peut être hélicoïdal, comme dans le document FR-A-2 809 671, afin de transformer un mouvement de pivotement d'une des pièces du corps en mouvement de translation de la pointe selon l'axe longitudinal de l'instrument. Pour verrouiller la pointe d'écriture en position sortie et/ou rétractée, il est connu de former un coude ou un décrochement, dans lequel vient se loger l'ergot du deuxième élément du mécanisme. Toutefois, l'ergot peut généralement sortir assez facilement de ce logement, par exemple lorsque l'on lâche le stylo d'une faible hauteur ou lorsqu'on appuie trop fortement sur la pointe. Ces mécanismes peuvent aussi donner une sensation désagréable de jeu du fait de la liberté de mouvement de l'ergot dans le logement. Pour réduire cette sensation de jeu il est connu de maintenir l'ergot en appui au fond du logement grâce à une pression exercée par un ressort sur le deuxième élément. Toutefois, l'utilisation d'un ressort augmente la force à exercer pour atteindre une position verrouillée. De plus, dans ce cas la force nécessaire pour verrouiller la pointe d'écriture en position sortie est généralement supérieure à celle nécessaire pour verrouiller la pointe en position rétractée. Dans d'autres types d'instruments d'écriture le guide s'étend globalement selon la direction longitudinale, le mécanisme étant alors commandé par un bouton poussoir. Pour ces derniers mécanismes le guide peut être terminé par un chemin en forme de cœur dans lequel l'ergot est piégé entre deux actions exercées sur le bouton. Mais outre les inconvénients mentionnés pour les mécanismes à guide hélicoïdal, on n'obtient pas toujours le verrouillage ou le déverrouillage du mécanisme pour chaque action exercée sur le bouton. L'ensemble de ces inconvénients a une influence néfaste sur le confort global d'utilisation de l'article d' écriture. La présente invention a pour but de pallier les inconvénients mentionnés ci-dessus, en proposant un mécanisme qui peut être verrouillé et déverrouillé en au moins une position, de manière sûre et confortable, si possible sans augmenter le coût de fabrication. A cet effet, l'invention a pour objet un mécanisme du type précité, caractérisé en ce que le dispositif de verrouillage comprend' un évidement s ' étendant dans le premier bord du guide entre une première et une deuxième extrémités, et un organe élastique qui s'étend en regard de l'évidement depuis au moins une première base solidaire de la première extrémité de l'évidement, jusqu'à un sommet agencé dans le guide à une distance du deuxième bord qui est inférieure à la largeur de l'ergot, ledit organe élastique étant susceptible d'être repoussé en direction de l'évidement lors du passage de l'ergot. La force nécessaire pour positionner l'ergot du deuxième élément d'un côté ou de l'autre du dispositif de verrouillage dépend de la force de rappel de l'organe élastique et du profil de celui-ci. Par conséquent une fois la géométrie de cet organe déterminée la force de verrouillage est constante, que le dispositif de verrouillage soit utilisé pour la position sortie ou rétractée de la pointe, et ce même pour des stylos présentant des géométries sensiblement différentes. L'évidement permet l'effacement de l'organe élastique lors du passage de l'ergot, et par conséquent la largeur de cet ergot peut être très proche de la largeur du guide ce qui limite les jeux et améliore le confort. Dans des formes de réalisations préférées de l'invention, on a recours, en outre, à l'une et/ou à l'autre des dispositions suivantes : - la base de l'organe élastique s'étend dans le prolongement du premier bord, afin de réduire la possibilité de jeu de l'ergot au niveau du dispositif de verrouillage ; - l'organe élastique présente une deuxième base solidaire de la deuxième extrémité de l'évidement, pour éviter un accrochage de l'ergot quel que soit son sens de déplacement ; l'organe élastique présente une portion intermédiaire en U, les extrémités des branches du ϋ étant respectivement solidaires des première et deuxième bases, et le sommet de l'organe élastique étant formé par la base du U. la première base présente une longueur sensiblement différente de la longueur de la deuxième base, afin que l'effort de déverrouillage soit différent de l'effort de verrouillage ; - le guide présente au moins une butée d' extrémité s'étendant entre les premier et deuxième bords, le dispositif de verrouillage étant agencé à une distance de la butée, qui adaptée pour que l'organe élastique soit en prise avec l'ergot lorsque celui-ci est en appui contre ladite butée d'extrémité, afin d'immobiliser l'ergot entre celle-ci et l'organe élastique ; le premier élément et le dispositif de verrouillage sont formés d'une seule pièce en matière plastique obtenue par moulage, afin de réduire les coûts de fabrication. La présente invention se rapporte également à un instrument d'écriture comprenant un corps tubulaire présentant une extrémité avant munie d'une ouverture, une pointe d'écriture mobile entre une position de rangement dans laquelle la pointe est agencée dans le corps et une position d'écriture dans laquelle la pointe passe à travers l'ouverture, et un mécanisme tel que défini précédemment, qui commande le passage d'une des positions de la pointe à l'autre position. Dans des modes de réalisation préférés de l'instrument d'écriture selon l'invention, on a recours, en outre, à l'une et/ou à l'autre des dispositions suivantes : - le corps comprend une première pièce tubulaire et une deuxième pièce tubulaire montée pivotante par rapport à la première pièce, le premier élément du mécanisme étant entraîné en rotation par ladite première pièce, le deuxième élément du mécanisme étant mobile en translation par rapport à ladite deuxième pièce, et le guide du mécanisme étant hélicoïdal, afin de transformer le mouvement de pivotement d'une pièce du corps par rapport à l'autre en mouvement de sortie ou de rétractation de la pointe d' écriture ; le guide hélicoïdal présente une butée d'extrémité proximale par rapport à l'ouverture, une butée d'extrémité distale, un premier dispositif de verrouillage agencé près de l'extrémité proximale, et un deuxième dispositif de verrouillage agencé près de l'extrémité distale, le verrouillage étant ainsi réalisé uniquement à l'aide des premier et deuxième éléments du mécanisme ; - un organe mobile relié à la pointe forme le deuxième élément du mécanisme, la première pièce du corps formant le premier élément du mécanisme, et la deuxième pièce présentant un logement coopérant avec l'organe mobile et adapté pour guider celui-ci en translation, dans le but de réduire le nombre de pièces. On notera que du fait de la force de rappel et l'organe élastique de sa position par rapport à la butée d'extrémité, il est parfaitement possible de ne pas avoir recours à un ressort sollicitant longitudinalement l'organe mobile, contrairement à la plupart des mécanismes connus. D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description qui va suivre, donnée à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels : - la figure 1 est une vue éclatée d'un instrument d'écriture comprenant un mécanisme réalisé selon l'invention ; - la figure 2 est une vue en coupe simplifiée de l'instrument d'écriture représenté à la figure 1 ; - la figure 3 est une vue partielle agrandie d'un élément de l'instrument représenté à la figure 1. Sur les différentes figures, on a conservé les mêmes références pour désigner des éléments identiques ou similaires. A la figure 1, est représenté en vue éclatée d'un instrument d' écriture 1 de type stylo bille à pointe rétractable. Le stylo présente un corps extérieur comportant une pointe avant 2 munie d'une ouverture, une première pièce 3 formant la portion avant du stylo et une deuxième pièce 4 formant la portion arrière. Une cartouche 5 présentant une pointe à bille 6 est montée coulissante à travers l'ouverture de la pointe 2. Comme on le voit mieux à la figure 2, la cartoucheThe present invention relates to a mechanism intended in particular for a writing instrument. More particularly the invention relates to a mechanism comprising: - a first element which comprises a guide extending between a first and a second substantially parallel edges; - A second element comprising a lug extending in the guide and movable along said guide, said lug having a given width in the transverse direction of the guide; and - at least one device for locking said lug. Many writing instruments include such a mechanism for removing or retracting a writing point which is most often a ball point. In these mechanisms, the guide, also called a cam path, is produced in the form of a groove or a slot. The guide can be helical, as in the document FR-A-2 809 671, in order to transform a pivoting movement of one of the parts of the body into translational movement of the tip along the longitudinal axis of the instrument. To lock the writing tip in the extended and / or retracted position, it is known to form an elbow or a recess, in which the lug of the second element of the mechanism is housed. However, the lug can generally come out quite easily from this housing, for example when you release the pen from a low height or when you press too hard on the tip. These mechanisms can also give an unpleasant feeling of play due to the freedom of movement of the lug in the housing. To reduce this feeling of play it is known to maintain the lug in support at the bottom of the housing through a pressure exerted by a spring on the second element. However, the use of a spring increases the force to be exerted to reach a locked position. In addition, in this case the force required to lock the writing tip in the extended position is generally greater than that required to lock the tip in the retracted position. In other types of writing instruments, the guide extends generally in the longitudinal direction, the mechanism then being controlled by a push button. For these latter mechanisms, the guide can be terminated by a heart-shaped path in which the lug is trapped between two actions exerted on the button. But in addition to the drawbacks mentioned for the helical guide mechanisms, one does not always obtain the locking or unlocking of the mechanism for each action exerted on the button. All of these drawbacks have a detrimental influence on the overall comfort of use of the writing article. The present invention aims to overcome the drawbacks mentioned above, by providing a mechanism which can be locked and unlocked in at least one position, in a safe and comfortable manner, if possible without increasing the manufacturing cost. To this end, the invention relates to a mechanism of the aforementioned type, characterized in that the locking device comprises' a recess extending in the first edge of the guide between a first and a second end, and an elastic member which extends opposite the recess from at least a first base integral with the first end of the recess, up to a vertex arranged in the guide at a distance from the second edge which is less than the width of the lug , said organ elastic being capable of being pushed towards the recess during the passage of the lug. The force required to position the lug of the second element on one side or the other of the locking device depends on the restoring force of the elastic member and on the profile thereof. Consequently, once the geometry of this member has been determined, the locking force is constant, whether the locking device is used for the extended or retracted position of the tip, even for pens having substantially different geometries. The recess allows the elastic member to be erased during the passage of the lug, and consequently the width of this lug can be very close to the width of the guide, which limits the play and improves comfort. In preferred embodiments of the invention, use is also made of one and / or the other of the following arrangements: the base of the elastic member extends in the extension of the first edge , in order to reduce the possibility of lug play at the locking device; - The elastic member has a second base secured to the second end of the recess, to avoid catching the lug regardless of its direction of movement; the elastic member has an intermediate U-shaped portion, the ends of the branches of the ϋ being respectively secured to the first and second bases, and the top of the elastic member being formed by the base of the U. the first base has a substantially different length the length of the second base, so that the unlocking force is different from the locking force; - The guide has at least one end stop extending between the first and second edges, the locking device being arranged at a distance from the stop, which adapted so that the elastic member is in engagement with the lug when the latter is in abutment against the said end stop, in order to immobilize the lug between the latter and the elastic member; the first element and the locking device are formed in one piece of plastic material obtained by molding, in order to reduce the manufacturing costs. The present invention also relates to a writing instrument comprising a tubular body having a front end provided with an opening, a writing tip movable between a storage position in which the tip is arranged in the body and a position of writing in which the tip passes through the opening, and a mechanism as defined above, which controls the passage from one of the positions of the tip to the other position. In preferred embodiments of the writing instrument according to the invention, use is also made of one and / or the other of the following arrangements: the body comprises a first tubular part and a second tubular part pivotally mounted relative to the first part, the first element of the mechanism being driven in rotation by said first part, the second element of the mechanism being movable in translation relative to said second part, and the guide of the mechanism being helical, in order to transform the pivoting movement of one part of the body with respect to the other into the movement for exiting or retracting the writing tip; the helical guide has a stop end proximal to the opening, a stop distal end, a first locking device arranged near the proximal end, and a second locking device arranged near the distal end, the locking being thus achieved only using the first and second elements of the mechanism; a movable member connected to the tip forms the second element of the mechanism, the first part of the body forming the first element of the mechanism, and the second part having a housing cooperating with the movable member and adapted to guide the latter in translation, in order to reduce the number of pieces. Note that due to the return force and the elastic member of its position relative to the end stop, it is perfectly possible not to have recourse to a spring longitudinally biasing the movable member, unlike most known mechanisms. Other characteristics and advantages of the invention will appear during the description which follows, given by way of nonlimiting example, with reference to the appended drawings in which: - Figure 1 is an exploded view of an instrument d writing comprising a mechanism produced according to the invention; - Figure 2 is a simplified sectional view of the writing instrument shown in Figure 1; - Figure 3 is an enlarged partial view of an element of the instrument shown in Figure 1. In the different figures, we have kept the same references to designate identical or similar elements. In Figure 1 is shown an exploded view of a writing instrument 1 type ballpoint pen with retractable tip. The pen has an external body comprising a front point 2 provided with an opening, a first part 3 forming the front portion of the pen and a second part 4 forming the rear portion. A cartridge 5 having a ball point 6 is slidably mounted through the opening of the point 2. As can be seen better in FIG. 2, the cartridge
5 est reliée à un organe mobile 8 par emmanchement de l'extrémité arrière de la cartouche dans un alésage de cet organe mobile. L'organe mobile 8 est déplaçable selon l'axe longitudinal X du stylo entre une position d'écriture pour laquelle la pointe d' écriture 6 sort du corps et une position de rangement pour laquelle la pointe 6 est agencée à l'intérieur du corps. La commande de ce déplacement sera expliquée plus en détails ci-après. La première pièce 3 du corps présente à l'arrière une portion 7 de diamètre réduit qui pénètre à l'intérieur de la deuxième pièce tubulaire 4 lorsque le stylo est assemblé . La portion arrière 7 forme un premier élément du mécanisme permettant de sortir ou de rétracter la pointe d'écriture 6. Ce premier élément 7 comprend un guide 9 délimité latéralement par un premier bord 11 et un deuxième bord 12 qui s'étendent parallèlement l'un à l'autre selon une ligne hélicoïdale. L'organe mobile 8 constitue un deuxième élément du mécanisme qui comporte un ergot 13. L'ergot 13 s'étend dans le guide 9 et peut coulisser le long du guide 9. Dans le mode de réalisation représenté le premier élément 7 est tubulaire et le guide 9 forme une fente hélicoïdale qui traverse cet élément. Toutefois, il pourrait s'agir d'une rainure hélicoïdale. L'organe mobile 8 présente une face extérieure cylindrique de diamètre adapté pour pénétrer dans le premier élément 7, l'ergot 13 s'étendant radialement par rapport à cette face extérieure cylindrique. On notera que l'organe mobile 8 comporte à son extrémité avant un décrochement 14 qui facilite l'insertion de l'ergot dans le guide 9. Comme cela est mieux visible sur la figure 3, le premier élément 7 comporte un premier et un deuxième dispositifs de verrouillage (15,16). Le dispositif de verrouillage 15 comprend un évidement 17 qui s'étend dans le premier bord 11 du guide entre une première extrémité 17a et une deuxième extrémité 17b. Dans le mode de réalisation représenté l'évidement 17 a la forme d'un trou oblong traversant la paroi du premier élément 7, mais il pourrait s'agir d'un simple creux notamment dans le cas où le guide 9 serait formé par une rainure. Le dispositif de verrouillage 15 comporte de plus un organe élastique 18 qui s'étend en regard de l'évidement 17. L'organe élastique comprend une première base 19 solidaire de la première extrémité 17a, une deuxième base 20 solidaire de la deuxième extrémité 17b et un sommet 21 constitué par la base d'une portion intermédiaire 22 en U dont l'extrémité des branches est solidaire des première et deuxième bases (19, 20) . Le sommet 21 est agencé dans le guide 9 à une distance du deuxième bord 12 qui doit être inférieur à la largeur de l'ergot, cette longueur étant mesurée selon un axe sensiblement perpendiculaire aux bords (11, 12) . Ainsi, lorsque l'ergot 13 coulisse dans le guide 9, il vient en contact avec la portion intermédiaire 22 de l'organe élastique ce qui crée une résistance au déplacement de l'ergot. L'utilisateur pourra alors augmenter la force exercée sur un organe de commande entraînant le deuxième élément 8 pour que la pression exercée par l'ergot sur la portion intermédiaire 22 soit supérieure à la force de rappel élastique de l'organe 18. L'organe élastique 18 est alors repoussé dans l'évidement 17 dont les dimensions doivent être adaptées pour permettre un effacement du sommet 21. Bien entendu, l'organe élastique revient en position après le passage de l'ergot. La portion intermédiaire 22 de l'organe élastique forme ainsi un point de verrouillage le long du guide 9, qui nécessite une force déterminée pour être franchi. On notera que cette force dépend essentiellement de la forme de l'organe élastique 18 et du profil de l'ergot 13, mais qui n'est pas influencée par d'autres éléments du stylo, comme par exemple un ressort qui peut être plus ou moins comprimé . Dans le mode de réalisation représenté, les première et deuxième bases (19, 20) et la portion intermédiaire 22 forment un pont au dessus de l'évidement, mais il est envisageable que la portion intermédiaire 22 ne soit reliée au premier bord 11 que par une seule base, par exemple la première base 19, et que la portion intermédiaire 22 s'étende jusqu'à proximité de la deuxième extrémité 17b. Toutefois, la structure en forme de pont permet de contrôler de manière plus précise la force nécessaire pour repousser l'organe élastique 18 dans l'évidement, et évite que l'organe élastique ne se mette en travers du guide 9, ce qui pourrait interdire le franchissement du point de verrouillage. On notera que les première et deuxième bases (19, 20) s'étendent dans le prolongement du premier bord 11 de manière à former une surface continue sur laquelle l'ergot peut coulisser sans à coup. Le guide 9 est fermé à ses extrémités par des butées, une butée proximale 25 longitudinalement située du côté de la pointe d'écriture 6 et une butée opposée 26 dite distale . Comme on le voit à la figure 3 où l'ergot 13 est symboliquement représenté en traits discontinus, la portion intermédiaire 22 de l'organe élastique 18 est située à une distance de la butée d'extrémité 25 telle que l'organe élastique 18 soit en prise avec l'ergot 13 lorsque celui-ci est en appui contre la butée 25. Ainsi, on réalise une position verrouillée dans lequel l'ergot 13 du deuxième élément est immobilisé sans jeu par le premier élément 7. Toutefois, il est envisageable que cette immobilisation soit obtenue par un point de contact entre l'organe élastique 18 et l'ergot 13, et un point de contact entre l'organe mobile 8 et une butée faisant partie de la deuxième pièce 4 du corps . La première base 19 s'étend dans le prolongement du bord 11 sur une distance plus importante que la deuxième base 20, de sorte que la première base 19 présente une plus grande élasticité. Cette disposition facilite le basculement de la portion intermédiaire 22 vers la première base 19, de sorte que la force nécessaire pour amener l'ergot 13 dans la position représentée à la figure 3 est inférieure à la force nécessaire pour quitter cette position. En d'autres termes, il est plus facile de verrouiller le mécanisme que de le déverrouiller ce qui augmente la fiabilité du verrouillage sans détériorer le confort d'utilisation. Mais il est possible d'adopter une disposition inverse pour l'un ou l'autre des dispositifs de verrouillage. Le deuxième dispositif de verrouillage 16 présente une structure identique à celle du premier dispositif 15 et est agencé de manière analogue par rapport à la butée d'extrémité distale 26. Ce deuxième dispositif de verrouillage ne sera pas plus détaillé, mais on notera qu' il permet de verrouiller la pointe d' écriture 6 en position rétractée alors que le premier dispositif de verrouillage 15 verrouille la pointe en position sortie. Le premier élément 7 du mécanisme comportant les premier et deuxième dispositifs de verrouillage (15, 16) et le guide 9, ainsi que la première pièce 3 du corps sont formés en une seule pièce. Cette pièce peut être en toute matière plastique connue qui présente des propriétés d'élasticité adéquates. Afin d'obtenir une production en grande série à un coût minimum, la pièce formant le premier élément du mécanisme et la première pièce du corps est réalisée par injection de matière plastique dans un moule. Le mécanisme décrit ci-dessus se prête particulièrement bien à la réalisation d'un instrument d'écriture dont la sortie/rétractation est commandée par pivotement d'une première pièce du corps par rapport à une ou plusieurs autres pièces du corps. A cet effet, dans le mode de réalisation représenté, la deuxième pièce 4 du corps est engagée sur la portion arrière 7 de la première pièce 3 de manière à pouvoir pivoter par rapport à celle-ci sur une plage angulaire d'environ 180°. Des bourrelets périphériques 28 formés sur la portion arrière 7 s'engagent avec des rainures correspondantes formées sur la face intérieure de la deuxième pièce 4, de manière à interdire tout déplacement relatif selon l'axe longitudinal X. L'organe mobile 8 comporte une extrémité arrière 30 de section transversale non cylindrique, par exemple comportant de méplats opposés. La pièce arrière 4 comporte un logement 31 s'étendant selon l'axe longitudinal et dont la section transversale correspond sensiblement à la section transversale de l'extrémité arrière 30, de sorte que celle-ci peut coulisser dans la pièce arrière 4 selon l'axe longitudinal X. Pour passer d'une position sortie à une position rétractée de la pointe 6, et inversement, l'utilisateur crée un pivotement entre la première pièce 3 et la deuxième pièce 4 du corps, sur environ un demi-tour. L'organe mobile 8 qui est entraîné en rotation par la deuxième pièce 4, effectue un mouvement d'avance ou de recul du fait de la coopération de l'ergot 13 avec le guide 9. Lorsque le mécanisme approche de la position sortie ou de la position rétractée, l'utilisateur passe un point dur qui indique que le stylo est verrouillé en position d'écriture ou de rangement . Une fois dans l'une ou l'autre de ces positions atteinte, la pointe d'écriture est immobilisée et seul un couple exercé entre les première et deuxième pièces (3, 4), suffisant pour vaincre la force de rappel du dispositif de verrouillage 15 ou 16, permet de quitter la position de rangement ou de sortie de la pointe. On notera que du fait du guidage positif de l'élément mobile 8 et du verrouillage élastique, il n'est pas nécessaire de prévoir un ressort qui sollicite la cartouche selon une direction longitudinale. De plus, du fait que le premier élément 7 du mécanisme fait partie intégrante de la première pièce 3 du corps, le nombre de pièces constituant le stylo est réduit. Dans le mode de réalisation représenté ces pièces sont au nombre de cinq, mais il serait envisageable de réaliser un stylo uniquement en 3 pièces en intégrant la pointe 2 avec la première pièce 3 et en formant intégralement l'organe mobile 8 avec la cartouche 5. Par conséquent, le mode de réalisation décrit ci- dessus permet de réaliser un article d'écriture particulièrement peu coûteux dont le nombre d'opérations d'assemblage est limité. Mais bien entendu, les premier et deuxième éléments (7, 8) pourraient être distincts des pièces 3 et 4 formant le corps, et même être reliées à celle-ci par l'intermédiaire de pièces supplémentaires telles que des manchons . Il apparaîtra clairement à l'homme du métier que le mécanisme comprenant l'organe mobile 8 et la portion arrière 7 munie du guide 9 peut être utilisé dans le domaine des instruments d'écriture non seulement pour sortir et rétracter une pointe d'écriture, mais aussi pour commander le déplacement d'autres organes. Par exemple, à l'aide d'un tel mécanisme il est possible de commander le déplacement d'une gomme, d'un dispositif d'avance de mines ou encore le mouvement combiné d'une pointe d'écriture et d'un organe d'obturation de l'ouverture du corps. 5 is connected to a movable member 8 by fitting the rear end of the cartridge into a bore in this movable member. The movable member 8 is movable along the longitudinal axis X of the pen between a writing position for which the writing tip 6 comes out of the body and a storage position for which the tip 6 is arranged inside the body . The control of this movement will be explained in more detail below. The first part 3 of the body has at the rear a portion 7 of reduced diameter which penetrates inside the second tubular part 4 when the pen is assembled. The rear portion 7 forms a first element of the mechanism making it possible to exit or retract the writing tip 6. This first element 7 comprises a guide 9 delimited laterally by a first edge 11 and a second edge 12 which extend parallel to the one to the other along a helical line. The movable member 8 constitutes a second element of the mechanism which comprises a lug 13. The lug 13 extends in the guide 9 and can slide along the guide 9. In the embodiment shown, the first element 7 is tubular and the guide 9 forms a helical slot which passes through this element. However, it could be a helical groove. The movable member 8 has a cylindrical outer face of diameter adapted to penetrate into the first element 7, the lug 13 extending radially relative to this cylindrical outer face. Note that the movable member 8 has at its front end a recess 14 which facilitates the insertion of the lug in the guide 9. As can be seen more clearly in FIG. 3, the first element 7 comprises first and second locking devices (15,16). The locking device 15 comprises a recess 17 which extends in the first edge 11 of the guide between a first end 17a and a second end 17b. In the embodiment shown the recess 17 has the shape of an oblong hole passing through the wall of the first element 7, but it could be a simple hollow, especially in the case where the guide 9 is formed by a groove . The locking device 15 further comprises an elastic member 18 which extends opposite the recess 17. The elastic member comprises a first base 19 secured to the first end 17a, a second base 20 secured to the second end 17b and a crown 21 constituted by the base of an intermediate portion 22 in U whose ends of the branches is integral with the first and second bases (19, 20). The apex 21 is arranged in the guide 9 at a distance from the second edge 12 which must be less than the width of the lug, this length being measured along an axis substantially perpendicular to the edges (11, 12). Thus, when the lug 13 slides in the guide 9, it comes into contact with the intermediate portion 22 of the elastic member, which creates resistance to the movement of the lug. The user can then increase the force exerted on a control member driving the second element 8 so that the pressure exerted by the lug on the intermediate portion 22 is greater than the elastic return force of the member 18. The member elastic 18 is then pushed back into the recess 17 whose dimensions must be adapted to allow erasure of the top 21. Of course, the elastic member returns to its position after the passage of the lug. The intermediate portion 22 of the elastic member thus forms a locking point along the guide 9, which requires a determined force to be crossed. Note that this force depends essentially on the shape of the elastic member 18 and the profile of the lug 13, but which is not influenced by other elements of the pen, such as for example a spring which can be more or less compressed. In the embodiment shown, the first and second bases (19, 20) and the intermediate portion 22 form a bridge above the recess, but it is possible that the intermediate portion 22 is only connected to the first edge 11 by a single base, for example the first base 19, and that the intermediate portion 22 extends as close to the second end 17b. However, the bridge-shaped structure makes it possible to control more precisely the force necessary to push the elastic member 18 into the recess, and prevents the elastic member from getting across the guide 9, which could prevent crossing the locking point. Note that the first and second bases (19, 20) extend in the extension of the first edge 11 so as to form a continuous surface on which the lug can slide smoothly. The guide 9 is closed at its ends by stops, a proximal stop 25 longitudinally located on the side of the writing tip 6 and an opposite stop 26 called distal. As seen in Figure 3 where the lug 13 is symbolically shown in broken lines, the portion intermediate 22 of the elastic member 18 is located at a distance from the end stop 25 such that the elastic member 18 is in engagement with the lug 13 when the latter is in abutment against the stop 25. Thus, realizes a locked position in which the lug 13 of the second element is immobilized without play by the first element 7. However, it is possible that this immobilization is obtained by a point of contact between the elastic member 18 and the lug 13, and a point of contact between the movable member 8 and a stop forming part of the second part 4 of the body. The first base 19 extends in the extension of the edge 11 over a greater distance than the second base 20, so that the first base 19 has greater elasticity. This arrangement facilitates the tilting of the intermediate portion 22 towards the first base 19, so that the force required to bring the lug 13 into the position shown in Figure 3 is less than the force required to leave this position. In other words, it is easier to lock the mechanism than to unlock it, which increases the reliability of the locking without deteriorating the comfort of use. However, it is possible to adopt a reverse arrangement for either of the locking devices. The second locking device 16 has a structure identical to that of the first device 15 and is arranged in a similar manner relative to the distal end stop 26. This second locking device will not be more detailed, but it will be noted that it allows the writing tip 6 to be locked in the retracted position while the first locking device 15 locks the tip in the extended position. The first element 7 of the mechanism comprising the first and second locking devices (15, 16) and the guide 9 and the first part 3 of the body are formed in one piece. This part can be of any known plastic material which has adequate elasticity properties. In order to obtain mass production at minimum cost, the part forming the first element of the mechanism and the first part of the body is produced by injecting plastic material into a mold. The mechanism described above lends itself particularly well to the production of a writing instrument the output / retraction of which is controlled by pivoting of a first part of the body relative to one or more other parts of the body. To this end, in the embodiment shown, the second part 4 of the body is engaged on the rear portion 7 of the first part 3 so as to be able to pivot relative to the latter over an angular range of approximately 180 °. Peripheral beads 28 formed on the rear portion 7 engage with corresponding grooves formed on the inner face of the second part 4, so as to prevent any relative movement along the longitudinal axis X. The movable member 8 has one end rear 30 of non-cylindrical cross section, for example having opposite flats. The rear part 4 comprises a housing 31 extending along the longitudinal axis and whose cross section corresponds substantially to the cross section of the rear end 30, so that the latter can slide in the rear part 4 along the longitudinal axis X. To pass from an extended position to a retracted position of the tip 6, and vice versa, the user creates a pivoting between the first part 3 and the second part 4 of the body, over approximately a half-turn. The movable member 8 which is rotated by the second part 4, performs a forward or backward movement due to the cooperation of the lug 13 with the guide 9. When the mechanism approaches the extended position or the retracted position, the user passes a hard point which indicates that the pen is locked in writing or storage position. Once in one or other of these positions reached, the writing tip is immobilized and only a torque exerted between the first and second parts (3, 4), sufficient to overcome the restoring force of the locking device 15 or 16, allows to leave the storage position or exit of the tip. Note that due to the positive guidance of the movable member 8 and the elastic locking, it is not necessary to provide a spring which biases the cartridge in a longitudinal direction. In addition, because the first element 7 of the mechanism is an integral part of the first part 3 of the body, the number of parts constituting the pen is reduced. In the embodiment shown, there are five of these parts, but it would be possible to make a pen only in 3 parts by integrating the tip 2 with the first part 3 and by integrally forming the movable member 8 with the cartridge 5. Consequently, the embodiment described above makes it possible to produce a particularly inexpensive writing article whose number of assembly operations is limited. But of course, the first and second elements (7, 8) could be separate from the parts 3 and 4 forming the body, and even be connected to the latter by means of additional parts such as sleeves. It will be clear to those skilled in the art that the mechanism comprising the movable member 8 and the portion rear 7 provided with the guide 9 can be used in the field of writing instruments not only to exit and retract a writing tip, but also to control the movement of other organs. For example, using such a mechanism it is possible to control the movement of an eraser, a mine advancing device or the combined movement of a writing tip and a member shutter the opening of the body.

Claims

REVENDICATIONS
1. Mécanisme pour instrument d'écriture comprenant: un premier élément (7) qui comprend un guide (9) s'étendant entre un premier et un deuxième bords (11, 12) sensiblement parallèles ; un deuxième élément (8) comportant un ergot (13) s'étendant dans le guide et mobile le long dudit guide, ledit ergot présentant une largeur donnée selon la direction transversale du guide ; et - au moins un dispositif de verrouillage (15; 16) dudit ergot, caractérisé en ce que le dispositif de verrouillage comprend un évidement (17) s'étendant dans le premier bord (11) entre une première et une deuxième extrémités (17a, 17b), et un organe élastique (18) qui s'étend en regard de l'évidement depuis au moins une première base (19) solidaire de la première extrémité de l'évidement, jusqu'à un sommet (21) agencé dans le guide à une distance du deuxième bord qui est inférieure à la largeur de l'ergot, ledit organe élastique étant susceptible d'être repoussé en direction de l'évidement lors du passage de l'ergot. 1. A mechanism for a writing instrument comprising: a first element (7) which comprises a guide (9) extending between a first and a second edge (11, 12) substantially parallel; a second element (8) comprising a lug (13) extending in the guide and movable along said guide, said lug having a given width in the transverse direction of the guide; and - at least one locking device (15; 16) of said lug, characterized in that the locking device comprises a recess (17) extending in the first edge (11) between a first and a second end (17a, 17b), and an elastic member (18) which extends opposite the recess from at least one first base (19) integral with the first end of the recess, up to a top (21) arranged in the guide at a distance from the second edge which is less than the width of the lug, said elastic member being capable of being pushed back in the direction of the recess during the passage of the lug.
2. Mécanisme selon la revendication 1, dans lequel la base (19) de l'organe élastique s'étend dans le prolongement du premier bord (11) . 2. Mechanism according to claim 1, wherein the base (19) of the elastic member extends in the extension of the first edge (11).
3. Mécanisme selon la revendication 1 ou 2, dans lequel l'organe élastique (18) présente une deuxième base (20) solidaire de la deuxième extrémité (17b) de l'évidement. 3. Mechanism according to claim 1 or 2, wherein the elastic member (18) has a second base (20) integral with the second end (17b) of the recess.
4. Mécanisme selon la revendication 3, dans lequel l'organe élastique (18) présente une portion intermédiaire en U (22), les extrémités des branches du U étant respectivement solidaires des première et deuxième bases (19,20), et le sommet (21) de l'organe élastique étant formé par la base du ϋ. 4. Mechanism according to claim 3, wherein the elastic member (18) has an intermediate U-shaped portion (22), the ends of the branches of the U being respectively secured to the first and second bases (19,20), and the top (21) of the elastic member being formed by the base of ϋ.
5. Mécanisme selon la revendication 3 ou 4, dans lequel la première base (19) présente une longueur sensiblement supérieure à la longueur de la deuxième base (20) . 5. Mechanism according to claim 3 or 4, wherein the first base (19) has a length substantially greater than the length of the second base (20).
6. Mécanisme selon l'une quelconque des revendications 1 à 5, dans lequel le guide (9) présente au moins une butée d'extrémité (25; 26) s'étendant entre les premier et deuxième bords (11,12), le dispositif de verrouillage (15; 16) étant agencé à une distance de la butée, qui adaptée pour que l'organe élastique (18) soit en prise avec l'ergot (13) lorsque celui-ci est en appui contre ladite butée. 6. Mechanism according to any one of claims 1 to 5, wherein the guide (9) has at least one end stop (25; 26) extending between the first and second edges (11,12), the locking device (15; 16) being arranged at a distance from the stop, which adapted so that the elastic member (18) is in engagement with the lug (13) when the latter is in abutment against said stop.
7. Mécanisme selon l'une quelconque des revendications 1 à 6, dans lequel le premier élément (7) et le dispositif de verrouillage (15; 16) sont formés d'une seule pièce en matière plastique obtenue par moulage. 7. Mechanism according to any one of claims 1 to 6, wherein the first element (7) and the locking device (15; 16) are formed in one piece of plastic obtained by molding.
8. Instrument d'écriture comprenant un corps tubulaire (3, 4) présentant une extrémité avant munie d'une ouverture, une pointe d'écriture (6) mobile entre une position de rangement dans laquelle la pointe est agencée dans le corps et une position d'écriture dans laquelle la pointe passe à travers l'ouverture, et un mécanisme selon l'une quelconque des revendications précédentes, qui commande le passage d'une des positions de la pointe à l'autre position. 8. Writing instrument comprising a tubular body (3, 4) having a front end provided with an opening, a writing tip (6) movable between a storage position in which the tip is arranged in the body and a writing position in which the point passes through the opening, and a mechanism according to any one of the preceding claims, which controls the passage from one of the positions of the point to the other position.
9. Instrument d'écriture selon la revendication 8, dans lequel le corps comprend une première pièce tubulaire (3) et une deuxième pièce tubulaire (4) montée pivotante par rapport à la première pièce, le premier élément (7) du mécanisme étant entraîné en rotation par ladite première pièce (3), le deuxième élément (8) du mécanisme étant mobile en translation par rapport à ladite deuxième pièce (4), et le guide (9) du mécanisme étant hélicoïdal. 9. Writing instrument according to claim 8, in which the body comprises a first tubular part (3) and a second tubular part (4) pivotally mounted relative to the first part, the first element (7) of the mechanism being driven. in rotation by said first part (3), the second element (8) of the mechanism being movable in translation relative to said second part (4), and the guide (9) of the mechanism being helical.
10. Instrument d'écriture selon la revendication 9, dans lequel le guide hélicoïdal (9) présente une butée d'extrémité proximale (25) par rapport à l'ouverture, une butée d'extrémité distale (26), un premier dispositif de verrouillage (15) agencé près de l'extrémité proximale, et un deuxième (16) dispositif de verrouillage agencé près de l'extrémité distale. 10. Writing instrument according to claim 9, wherein the helical guide (9) has a proximal end stop (25) relative to the opening, a distal end stop (26), a first locking device (15) arranged near the proximal end , and a second (16) locking device arranged near the distal end.
11. Instrument d'écriture selon la revendication 9 ou 10, dans lequel un organe mobile (8) relié à la pointe forme le deuxième élément du mécanisme, la première pièce (3) du corps formant le premier élément (7) du mécanisme, et la deuxième pièce (4) présentant un logement (31) coopérant avec l'organe mobile (8) et adapté pour guider celui-ci en translation. 11. writing instrument according to claim 9 or 10, in which a movable member (8) connected to the tip forms the second element of the mechanism, the first part (3) of the body forming the first element (7) of the mechanism, and the second part (4) having a housing (31) cooperating with the movable member (8) and adapted to guide the latter in translation.
EP05730727A 2004-02-24 2005-02-22 Mechanism for writing instrument and writing instrument comprising same Withdrawn EP1718479A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0401842A FR2866599B1 (en) 2004-02-24 2004-02-24 LOCKING MECHANISM FOR A WRITING INSTRUMENT, AND WRITING INSTRUMENT COMPRISING SUCH A MECHANISM
PCT/FR2005/000411 WO2005092637A2 (en) 2004-02-24 2005-02-22 Mechanism for writing instrument and writing instrument comprising same

Publications (1)

Publication Number Publication Date
EP1718479A2 true EP1718479A2 (en) 2006-11-08

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Application Number Title Priority Date Filing Date
EP05730727A Withdrawn EP1718479A2 (en) 2004-02-24 2005-02-22 Mechanism for writing instrument and writing instrument comprising same

Country Status (12)

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US (1) US20070172301A1 (en)
EP (1) EP1718479A2 (en)
JP (1) JP4772773B2 (en)
KR (1) KR101227292B1 (en)
CN (1) CN100453340C (en)
AU (1) AU2005225173B2 (en)
BR (1) BRPI0507964A (en)
CA (1) CA2556977C (en)
FR (1) FR2866599B1 (en)
RU (1) RU2345901C2 (en)
WO (1) WO2005092637A2 (en)
ZA (1) ZA200607246B (en)

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Also Published As

Publication number Publication date
AU2005225173A1 (en) 2005-10-06
JP4772773B2 (en) 2011-09-14
CN1922038A (en) 2007-02-28
AU2005225173B2 (en) 2010-09-02
CA2556977C (en) 2012-12-18
RU2345901C2 (en) 2009-02-10
KR20070021160A (en) 2007-02-22
WO2005092637A3 (en) 2006-01-12
ZA200607246B (en) 2008-05-28
RU2006133934A (en) 2008-03-27
JP2007522974A (en) 2007-08-16
FR2866599A1 (en) 2005-08-26
CA2556977A1 (en) 2005-10-06
CN100453340C (en) 2009-01-21
BRPI0507964A (en) 2007-07-17
WO2005092637A2 (en) 2005-10-06
FR2866599B1 (en) 2006-05-26
KR101227292B1 (en) 2013-01-29
US20070172301A1 (en) 2007-07-26

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