EP0842744B1 - Control device for pneumatic tools - Google Patents

Control device for pneumatic tools Download PDF

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Publication number
EP0842744B1
EP0842744B1 EP97402664A EP97402664A EP0842744B1 EP 0842744 B1 EP0842744 B1 EP 0842744B1 EP 97402664 A EP97402664 A EP 97402664A EP 97402664 A EP97402664 A EP 97402664A EP 0842744 B1 EP0842744 B1 EP 0842744B1
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EP
European Patent Office
Prior art keywords
trigger
intake
motor
piston
conduit
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Expired - Lifetime
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EP97402664A
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German (de)
French (fr)
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EP0842744A1 (en
Inventor
Jean-Louis Chapelle
Didier Barbier
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Charles Maire Ets
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Charles Maire Ets
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Publication of EP0842744A1 publication Critical patent/EP0842744A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B21/00—Portable power-driven screw or nut setting or loosening tools; Attachments for drilling apparatus serving the same purpose

Definitions

  • the present invention relates to a pneumatic device control device such than screwdrivers.
  • Pneumatic devices and in particular the screwdrivers, generally consist of a body inside which is housed a pneumatic motor connected by a kinematic link to an organ drive, the body having a connected handle to a source of pressurized fluid comprising a trigger to control the air intake under pressure so that the motor is rotated.
  • One of the aims of the present invention is to remedy these drawbacks.
  • the device, object of the invention is intended for the control of pneumatic devices such as screwdrivers comprising a body in which is housed a driving pneumatic motor, by a link kinematics a tool, said body being integral with a handle comprising, on the one hand, an intake channel intended to be connected to a flexible pipe of compressed air distribution and, on the other hand, a channel exhaust connected directly to the exhaust of the motor, said control device comprising a trigger, capable of being tiltably mounted on a handle, an intermediate point of its length, and connected by a kinematic link to a valve for command, when it is tilted in one direction or in the other, the admission of compressed air to a cavity opening onto a first intake duct corresponding to a normal direction of rotation of the motor, the trigger being tilted in one direction and on a second intake duct corresponding to an opposite direction motor rotation, the trigger being tilted in the other direction and means to selectively drive compressed air to either of the conduits of admission, according to the direction of tilting of the
  • the end pusher cooperating with the cam has a bearing ball.
  • the actuation of the trigger in the direction corresponding to the opposite direction of rotation of the engine is smooth and progressive for the user.
  • the various figures show a pneumatic screwdriver comprising a body 1 with a handle 2 having an intake channel 4 intended to be connected by a fitting 5 to a flexible pipe (not shown) of pressurized fluid inlet.
  • a channel is provided exhaust 7, connected directly to the exhaust a motor 8, driving, by a kinematic link, a tool 16.
  • the handle 2 has a housing 9, crossed by an axis 10 on which is tiltably mounted a trigger 11 with an end 11a for controlling the motor rotation in one direction, and one end 11b motor rotation control in the other direction.
  • the intake channel 4 has a seat 14 with which a valve 15 urged by a spring cooperates compression 17, inserted between fitting 5 and said valve, the latter being integral with a rod 19 which fits into an opening 20 of a movable piston 21 in a cylinder 22.
  • the cylinder 22 is pierced with a light 23 for the passage of the rod 19 and is fixed by a end 22a to the handle 2, its other end 22b extending inside a large cavity 26 formed in the body 1.
  • the end 22b of the cylinder 22 is finished by a flourishing 27 into which a end of a spring 28 whose other end takes support on a shoulder 29 of a shaped cam 30 at one end of the piston 21.
  • the piston 21, at its end opposite to that provided with the cam 30, has a slot lateral 31, with which a finger 32 cooperates, integral of the trigger 11.
  • the trigger 11 is in an equilibrium position in which the valve 15 is closed.
  • the cavity 26 opens onto a wall rear end 35 disposed opposite a wall 57 and having two elongated lights 36 and 38, the light 36 extending opposite a duct intake 37 for the passage of compressed air so that the motor 8 is supplied in the normal direction of rotation, while light 38 is located at the right a compressed air intake duct 40 so that the motor 8 is supplied in order to turn in the direction opposite, these intake ducts 37 and 40 being formed in the wall 57 which also has a conduit exhaust 56.
  • the selector 43 is, at its free end, finished with a pallet 45 which, on its turned side opposite the wall 57, has the shape of a bowl.
  • Pallet 45 is likely to port conduits 40 and 56, the compressed air intake via line 37, or to put in communication conduits 56 and 37, the compressed air intake taking place through conduit 40.
  • a retaining stop 54 is provided, cooperating with a shoulder 55 of the pusher 51 for prevent it from escaping from bore 50.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Nailing Machines And Staplers (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)

Description

La présente invention se rapporte à un dispositif de commande d'appareils pneumatiques tels que des visseuses.The present invention relates to a pneumatic device control device such than screwdrivers.

Les appareils pneumatiques, et notamment les visseuses, sont généralement constitués d'un corps à l'intérieur duquel est logé un moteur pneumatique relié par une liaison cinématique à un organe d'entraínement, le corps comportant une poignée reliée à une source de fluide sous pression et comportant une détente pour commander l'admission d'air sous pression afin que le moteur soit entraíné en rotation.Pneumatic devices, and in particular the screwdrivers, generally consist of a body inside which is housed a pneumatic motor connected by a kinematic link to an organ drive, the body having a connected handle to a source of pressurized fluid comprising a trigger to control the air intake under pressure so that the motor is rotated.

Dans de nombreux cas, et notamment dans des visseuses, il est nécessaire que l'on puisse faire tourner le moteur dans le sens normal, mais également dans le sens opposé.In many cases, especially in screwdrivers, it is necessary that we can do turn the engine in the normal direction, but also in the opposite direction.

Dans la technique antérieure, voir GB 2 106 024 A, on connaít un dispositif de commande dans lequel la détente est basculante à partir d'un point intermédiaire et est montée de manière que, lorsqu'elle est sollicitée au voisinage d'une extrémité, on commande l'admission dans le sens normal de rotation du moteur, tandis que, lorsqu'elle est sollicitée au voisinage de l'autre extrémité, on commande la rotation du moteur dans le sens inverse.In the prior art, see GB 2 106 024 A, we know a control device in which the trigger is tilting from an intermediate point and is mounted so that when it is stressed near one end, we order admission in the normal direction of rotation of the motor, while, when requested in the vicinity of the other end, we control the rotation of the motor in the reverse.

Une telle réalisation est très pratique, car l'ouvrier, en déplaçant simplement son doigt sur la détente, peut commander le vissage ou le dévissage. Such an achievement is very practical, because the worker, by simply moving his finger on trigger, can control screwing or unscrewing.

Une telle réalisation s'est avérée d'une construction complexe et chère.Such an achievement has proven to be complex and expensive construction.

L'un des buts de la présente invention est de remédier à ces inconvénients.One of the aims of the present invention is to remedy these drawbacks.

Le dispositif, objet de l'invention, est destiné à la commande des appareils pneumatiques tels que des visseuses comprenant un corps dans lequel est logé un moteur pneumatique entraínant, par une liaison cinématique un outil, ledit corps étant solidaire d'une poignée comportant, d'une part, un canal d'admission destiné à être relié à une conduite souple de distribution d'air comprimé et, d'autre part, un canal d'échappement relié directement à l'échappement du moteur, ledit dispositif de commande comportant une détente, apte à être montée basculante sur une poignée, en un point intermédiaire de sa longueur, et reliée par une liaison cinématique à une soupape pour commander, lorsqu'elle est basculée dans un sens ou dans l'autre, l'admission d'air comprimé vers une cavité s'ouvrant sur un premier conduit d'admission correspondant à un sens normal de rotation du moteur, la détente étant basculée dans un sens et sur un second conduit d'admission correspondant à un sens opposé de rotation du moteur, la détente étant basculée dans l'autre sens et des moyens pour sélectivement conduire l'air comprimé vers l'un ou l'autre des conduits d'admission, suivant le sens de basculement de la détente, ledit dispositif de commande étant caractérisé en ce que la détente est reliée à un piston mobile dans un cylindre, une tige solidaire de la soupape s'insérant dans une ouverture du piston de manière, lorsque la détente est basculée dans un sens ou dans l'autre, à commander l'admission d'air comprimé, ledit piston, du côté opposé à la détente, comportant une came coopérant avec une extrémité d'un poussoir guidé dans un alésage du corps et dont l'autre extrémité porte contre un sélecteur dont une extrémité est articulée sur un axe d'une paroi du corps et comportant un conduit d'échappement, tandis que l'autre extrémité est terminée par une palette coopérant avec ladite paroi, des moyens élastiques maintenant le sélecteur dans une position dans laquelle le premier conduit d'admission peut être alimenté, la palette mettant en communication le second conduit d'admission avec le conduit d'échappement, le basculement de la détente, dans le sens correspondant à la rotation normale du moteur, engendrant un coulissement dans un sens du piston pour commander l'ouverture de la soupape, tandis que le basculement de la détente dans le sens opposé engendre un coulissement du piston dans un sens opposé pour, d'une part, commander l'ouverture de la soupape et, d'autre.part, que la came déplace le poussoir qui, en coopérant avec le sélecteur, déplace celui-ci afin que la palette occulte le premier conduit d'admission et dégage le second conduit d'admission et mette en communication le premier conduit d'admission avec le conduit d'échappement.The device, object of the invention, is intended for the control of pneumatic devices such as screwdrivers comprising a body in which is housed a driving pneumatic motor, by a link kinematics a tool, said body being integral with a handle comprising, on the one hand, an intake channel intended to be connected to a flexible pipe of compressed air distribution and, on the other hand, a channel exhaust connected directly to the exhaust of the motor, said control device comprising a trigger, capable of being tiltably mounted on a handle, an intermediate point of its length, and connected by a kinematic link to a valve for command, when it is tilted in one direction or in the other, the admission of compressed air to a cavity opening onto a first intake duct corresponding to a normal direction of rotation of the motor, the trigger being tilted in one direction and on a second intake duct corresponding to an opposite direction motor rotation, the trigger being tilted in the other direction and means to selectively drive compressed air to either of the conduits of admission, according to the direction of tilting of the trigger, said control device being characterized in that the trigger is connected to a movable piston in a cylinder, a rod secured to the valve fitting into an opening in the piston so, when the trigger is tilted in one direction or in the other, to control the admission of compressed air, said piston, on the side opposite to the trigger, comprising a cam cooperating with one end of a guided pusher in a body bore and the other end of which door against a selector one end of which is articulated on an axis of a wall of the body and comprising one exhaust pipe, while the other end is terminated by a pallet cooperating with said wall, elastic means maintaining the selector in a position in which the first intake duct can be supplied, the pallet connecting the second intake duct with the exhaust duct, the tilting of the detent, in the direction corresponding to normal rotation motor causing sliding in one direction the piston to control the opening of the valve, while flipping the trigger in the direction opposite causes the piston to slide in one direction opposite to, on the one hand, order the opening of the valve and, on the other hand, that the cam moves the pusher which, by cooperating with the selector, moves it so that the pallet obscures the first channel intake and clears the second intake duct and connect the first intake duct with the exhaust pipe.

Grâce à cette disposition, on réalise un dispositif de commande d'une conception simple et d'un fonctionnement sûr.Thanks to this arrangement, a control device of simple design and safe operation.

Suivant un détail constructif, l'extrémité du poussoir coopérant avec la came comporte un roulement à billes.According to a constructive detail, the end pusher cooperating with the cam has a bearing ball.

Ainsi, l'actionnement de la détente dans le sens correspondant au sens opposé de la rotation du moteur est doux et progressif pour l'utilisateur. Thus, the actuation of the trigger in the direction corresponding to the opposite direction of rotation of the engine is smooth and progressive for the user.

L'invention va maintenant être décrite avec plus de détails, en se référant à un mode de réalisation particulier donné à titre d'exemple seulement et représenté aux dessins annexés dans lesquels :

  • Figure 1 est une vue en coupe axiale d'une visseuse selon l'invention,
  • Figure 2 est une vue en coupe, suivant la ligne 2-2 de la figure 1,
  • Figure 3 est une vue en coupe, suivant la ligne 3-3 de la figure 1,
  • Figure 4 est une vue en coupe, similaire à celle de la figure 3, mais le sélecteur ayant été sollicité vers une position commandant la rotation dans le sens inverse du moteur 8.
  • Figure 5 est une vue en coupe suivant la ligne 5-5 de la figure 3.
  • Figure 6 est une vue en coupe suivant la ligne 6-6 de la figure 4.
    • The invention will now be described in more detail, with reference to a particular embodiment given by way of example only and shown in the accompanying drawings in which:
  • FIG. 1 is a view in axial section of a screwdriver according to the invention,
  • FIG. 2 is a sectional view, along line 2-2 of FIG. 1,
  • Figure 3 is a sectional view along line 3-3 of Figure 1,
  • FIG. 4 is a sectional view, similar to that of FIG. 3, but the selector having been urged towards a position controlling the rotation in the opposite direction of the motor 8.
  • Figure 5 is a sectional view along line 5-5 of Figure 3.
  • Figure 6 is a sectional view along line 6-6 of Figure 4.

    • Aux différentes figures, on a représenté une visseuse pneumatique comprenant un corps 1 avec une poignée 2 présentant un canal d'admission 4 destiné à être relié par un raccord 5 à un tuyau souple (non représenté) d'arrivée de fluide sous pression.The various figures show a pneumatic screwdriver comprising a body 1 with a handle 2 having an intake channel 4 intended to be connected by a fitting 5 to a flexible pipe (not shown) of pressurized fluid inlet.

    Dans la poignée 2, il est prévu un canal d'échappement 7, relié directement à l'échappement d'un moteur 8, entraínant, par une liaison cinématique, un outil 16. In handle 2, a channel is provided exhaust 7, connected directly to the exhaust a motor 8, driving, by a kinematic link, a tool 16.

    La poignée 2 comporte un logement 9, traversé par un axe 10 sur lequel est montée basculante une détente 11 avec une extrémité 11a de commande de la rotation du moteur dans un sens, et une extrémité 11b de commande de la rotation du moteur dans l'autre sens.The handle 2 has a housing 9, crossed by an axis 10 on which is tiltably mounted a trigger 11 with an end 11a for controlling the motor rotation in one direction, and one end 11b motor rotation control in the other direction.

    Le canal d'admission 4 comporte un siège 14 avec lequel coopère une soupape 15 poussée par un ressort de compression 17, inséré entre le raccord 5 et ladite soupape, celle-ci étant solidaire d'une tige 19 qui s'insère dans une ouverture 20 d'un piston 21 mobile dans un cylindre 22.The intake channel 4 has a seat 14 with which a valve 15 urged by a spring cooperates compression 17, inserted between fitting 5 and said valve, the latter being integral with a rod 19 which fits into an opening 20 of a movable piston 21 in a cylinder 22.

    Le cylindre 22 est percé d'une lumière 23 pour le passage de la tige 19 et est fixé par une extrémité 22a à la poignée 2, son autre extrémité 22b s'étendant à l'intérieur d'une large cavité 26 pratiquée dans le corps 1.The cylinder 22 is pierced with a light 23 for the passage of the rod 19 and is fixed by a end 22a to the handle 2, its other end 22b extending inside a large cavity 26 formed in the body 1.

    L'extrémité 22b du cylindre 22 est terminée par un épanouissement 27 dans lequel s'insère une extrémité d'un ressort 28 dont l'autre extrémité prend appui sur un épaulement 29 d'une came 30 conformée à une extrémité du piston 21.The end 22b of the cylinder 22 is finished by a flourishing 27 into which a end of a spring 28 whose other end takes support on a shoulder 29 of a shaped cam 30 at one end of the piston 21.

    Le piston 21, à son extrémité opposée à celle pourvue de la came 30, présente une fente latérale 31, avec laquelle coopère un doigt 32, solidaire de la détente 11. Ainsi, grâce au ressort 28, la détente 11 est dans une position d'équilibre dans laquelle la soupape 15 est fermée.The piston 21, at its end opposite to that provided with the cam 30, has a slot lateral 31, with which a finger 32 cooperates, integral of the trigger 11. Thus, thanks to the spring 28, the trigger 11 is in an equilibrium position in which the valve 15 is closed.

    La cavité 26 débouche sur une paroi d'extrémité arrière 35 disposée en regard d'une paroi 57 et présentant deux lumières allongées 36 et 38, la lumière 36 s'étendant en regard d'un conduit d'admission 37 pour le passage de l'air comprimé afin que le moteur 8 soit alimenté dans le sens normal de rotation, tandis que la lumière 38 est située au droit d'un conduit 40 d'admission d'air comprimé pour que le moteur 8 soit alimenté afin de tourner dans le sens opposé, ces conduits d'admission 37 et 40 étant pratiqués dans la paroi 57 qui comporte également un conduit d'échappement 56.The cavity 26 opens onto a wall rear end 35 disposed opposite a wall 57 and having two elongated lights 36 and 38, the light 36 extending opposite a duct intake 37 for the passage of compressed air so that the motor 8 is supplied in the normal direction of rotation, while light 38 is located at the right a compressed air intake duct 40 so that the motor 8 is supplied in order to turn in the direction opposite, these intake ducts 37 and 40 being formed in the wall 57 which also has a conduit exhaust 56.

    Comme on le voit sur les figures 3 et 4, en avant de la paroi d'extrémité arrière, est mobile, sur un axe 42, un sélecteur 43 coopérant avec la paroi 57, ramené par un ressort 44 dans une position correspondant au sens normal de fonctionnement du moteur 8.As seen in Figures 3 and 4, in front of the rear end wall, is movable, on an axis 42, a selector 43 cooperating with the wall 57, brought back by a spring 44 in a position corresponding to the normal operating direction of the motor 8.

    Le sélecteur 43 est, à son extrémité libre, terminé par une palette 45 qui, sur sa face tournée en regard de la paroi 57, affecte la forme d'une cuvette. La palette 45 est susceptible de mettre en communication les conduits 40 et 56, l'admission d'air comprimé s'effectuant par le conduit 37, ou de mettre en communication les conduits 56 et 37, l'admission d'air comprimé s'effectuant par le conduit 40.The selector 43 is, at its free end, finished with a pallet 45 which, on its turned side opposite the wall 57, has the shape of a bowl. Pallet 45 is likely to port conduits 40 and 56, the compressed air intake via line 37, or to put in communication conduits 56 and 37, the compressed air intake taking place through conduit 40.

    Dans le corps 1 est pratiqué, radialement et au droit du sélecteur 43, un alésage 50 dans lequel est mobile un poussoir 51 comportant un roulement 52 destiné à coopérer avec la came 30.In the body 1 is practiced, radially and to the right of the selector 43, a bore 50 in which is movable a pusher 51 comprising a bearing 52 intended to cooperate with the cam 30.

    Il est prévu une butée de retenue 54, coopérant avec un épaulement 55 du poussoir 51 pour éviter que celui-ci s'échappe de l'alésage 50.A retaining stop 54 is provided, cooperating with a shoulder 55 of the pusher 51 for prevent it from escaping from bore 50.

    Le fonctionnement est le suivant : l'air comprimé arrive par le canal d'admission 4 ; si la détente 11 n'est pas sollicitée, la soupape 15 reste fermée. Si l'opérateur appuie sur l'extrémité 11a de la détente 11, la tige 19 bascule et engendre le décollement de la soupape de son siège 14, l'air comprimé passe par la cavité 26, traverse la lumière 36 et alimente le moteur par le conduit d'admission 37 (figures 3 et 5), l'échappement s'effectuant par les conduits 40 et 56 qui sont en communication.The operation is as follows: air tablet arrives through the intake channel 4; if the trigger 11 is not requested, valve 15 remains closed. If the operator presses the end 11a of the trigger 11, the rod 19 rocks and generates the detachment of the valve from its seat 14, the compressed air passes through the cavity 26, passes through the light 36 and feeds the engine through the intake duct 37 (Figures 3 and 5), the exhaust being effected by the conduits 40 and 56 which are in communication.

    Dès que la détente est relâchée, la soupape se referme et le moteur n'est plus alimenté.As soon as the trigger is released, the valve closes and the motor is no longer powered.

    Si, au contraire, l'opérateur appuie sur l'extrémité 11b, le piston 21 est poussé vers l'extrémité arrière du corps 1, engendrant, d'une part, un basculement de la tige 19 pour commander l'ouverture de la soupape, et, d'autre part, un déplacement de la came 30 qui, en coopérant avec le roulement 52, déplace le poussoir 51 qui, en portant contre le sélecteur 43, commande le pivotement de celui-ci sur son axe 42 contre l'action du ressort 44, de sorte que la palette 45 vient fermer le conduit d'admission 37 (figures 4 et 6) et ouvrir le conduit d'admission 40, ledit conduit d'admission 37 étant en communication avec le conduit d'échappement 56. Ainsi, à travers la lumière 38 et ledit conduit 40, le moteur 8 est alimenté afin de tourner dans le sens opposé à celui dans lequel il tourne lorsque le conduit d'admission 37 est alimenté.If, on the contrary, the operator presses the end 11b, the piston 21 is pushed towards the end rear of the body 1, generating, on the one hand, a tilting of the rod 19 to control the opening of the valve, and, on the other hand, a displacement of the cam 30 which, by cooperating with the bearing 52, moves the pusher 51 which, bearing against the selector 43, controls the pivoting thereof its axis 42 against the action of the spring 44, so that the pallet 45 comes to close the intake duct 37 (Figures 4 and 6) and open the intake duct 40, said intake duct 37 being in communication with the exhaust duct 56. So, through light 38 and said conduit 40, motor 8 is powered in order to rotate in the opposite direction to that in which it rotates when the intake duct 37 is powered.

    Dès qu'on relâche la détente 11, le sélecteur 43, sous l'action du ressort 44, revient dans sa position initiale et le poussoir 51, par le roulement 52, en coopérant avec la came 30 ainsi que la tige 19 et le ressort 17, ramène la détente vers la position neutre.As soon as the trigger 11 is released, the selector 43, under the action of spring 44, returns in its initial position and the pusher 51, by the bearing 52, cooperating with cam 30 as well as the rod 19 and the spring 17, brings the trigger towards the neutral position.

    Claims (2)

    1. A control device for pneumatic appliances such as screw guns comprising a body (1) in which there is housed a pneumatic motor (8) driving a tool (16) by a kinematic link, the said body (1) being integral with a handle (2) comprising, on the one hand, an intake duct (4) intended to be connected to a hose for the distribution of compressed air, and, on the other hand, an exhaust duct (7) connected directly to the exhaust of the motor (8), the said control device comprising a trigger suitable to be mounted to rock on a handle at an intermediate point of its length, and connected by a kinematic link to a valve (15) to control, when it is rocked in one direction or the other, the intake of compressed air towards a cavity (26) which opens onto a first intake conduit (37) corresponding to a normal direction of rotation of the motor, the trigger (11) being rocked in one direction, and onto a second intake conduit (40) corresponding to an opposite direction of rotation of the motor, the trigger being rocked in the other direction, and means for selectively conveying the compressed air towards the one or the other of the intake conduits (37, 40), according to the rocking direction of the trigger, the said control device being
      characterised in that the trigger (11) is connected to a piston (21) which can move in a cylinder (22), a rod (19) joined to the valve (15) being inserted into an opening of the piston (21) so as, when the trigger is rocked in one direction or the other, to control the intake of compressed air, the said piston (21), on the side opposite the trigger (11), comprising a cam (30) cooperating with one end of a thrustor (51) guided in a bore (50) of the body and the other end of which bears against a selector (43), one end of which is articulated on a pin (42) of a wall (57) of the body and comprising an exhaust conduit (56), whereas the other end ends in a blade (45) cooperating with the said wall (57), elastic means (44) keeping the selector (43) in a position in which the first intake conduit (31) can be supplied, the blade (45) bringing the second intake conduit (40) into communication with the exhaust conduit (56), the rocking of the trigger, in the direction corresponding to the normal rotation of the motor, causing a sliding in one direction of the piston (21) to control the opening of the valve, whereas the rocking of the trigger (11) in the opposite direction causes a sliding of the piston (21) in an opposite direction so as, on the one hand, to control the opening of the valve (15) and, on the other hand, so that the cam (30) displaces the thrustor (51), which, by cooperating with the selector, moves it so that the blade (45) closes the first intake conduit (37), uncovers the second intake conduit (40) and brings the first intake conduit (37) into communication with the exhaust conduit (56).
    2. A control device for pneumatic appliances such as screw guns, according to Claim 1,
      characterised in that the end of the thrustor (51) which cooperates with the cam (30) comprises a ball bearing (52).
    EP97402664A 1996-11-19 1997-11-06 Control device for pneumatic tools Expired - Lifetime EP0842744B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    FR9614089A FR2755891B1 (en) 1996-11-19 1996-11-19 PNEUMATIC DEVICE CONTROL DEVICE
    FR9614089 1996-11-19

    Publications (2)

    Publication Number Publication Date
    EP0842744A1 EP0842744A1 (en) 1998-05-20
    EP0842744B1 true EP0842744B1 (en) 2002-05-15

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    Application Number Title Priority Date Filing Date
    EP97402664A Expired - Lifetime EP0842744B1 (en) 1996-11-19 1997-11-06 Control device for pneumatic tools

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    US (1) US5913370A (en)
    EP (1) EP0842744B1 (en)
    DE (1) DE69712588T2 (en)
    ES (1) ES2175303T3 (en)
    FR (1) FR2755891B1 (en)

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    Also Published As

    Publication number Publication date
    DE69712588T2 (en) 2002-10-24
    EP0842744A1 (en) 1998-05-20
    ES2175303T3 (en) 2002-11-16
    FR2755891B1 (en) 1999-01-08
    DE69712588D1 (en) 2002-06-20
    US5913370A (en) 1999-06-22
    FR2755891A1 (en) 1998-05-22

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