EP2388113A1 - Safety knife - Google Patents

Safety knife Download PDF

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Publication number
EP2388113A1
EP2388113A1 EP11166218A EP11166218A EP2388113A1 EP 2388113 A1 EP2388113 A1 EP 2388113A1 EP 11166218 A EP11166218 A EP 11166218A EP 11166218 A EP11166218 A EP 11166218A EP 2388113 A1 EP2388113 A1 EP 2388113A1
Authority
EP
European Patent Office
Prior art keywords
blade
blade holder
abutment
knife
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP11166218A
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German (de)
French (fr)
Other versions
EP2388113B2 (en
EP2388113B1 (en
Inventor
Jean-Claude Peyrot
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.)
Mure et Peyrot SAS
Original Assignee
Mure et Peyrot SAS
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Application filed by Mure et Peyrot SAS filed Critical Mure et Peyrot SAS
Publication of EP2388113A1 publication Critical patent/EP2388113A1/en
Application granted granted Critical
Publication of EP2388113B1 publication Critical patent/EP2388113B1/en
Publication of EP2388113B2 publication Critical patent/EP2388113B2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B5/00—Hand knives with one or more detachable blades
    • B26B5/001—Hand knives with one or more detachable blades with blades being slid out of handle immediately prior to use

Definitions

  • the present invention relates to a safety knife in that it comprises a blade retracting automatically at the end of cutting.
  • the drive stops are disengaged by a ramp system as known in the document EP 1 273 399 A1 .
  • the spring loaded blade holder At the end of cutting, the spring loaded blade holder returns to the rear position.
  • the present invention aims to improve such a knife by ensuring a more precise position of the blade holder in the advanced position and a more controlled rotation so that the tooth comes more precisely fit into the cutout of the knife housing.
  • the present invention proposes a knife with a retractable blade that automatically comprises a knife body provided with a housing for receiving a blade integral with a blade holder and provided with a blade blade drive pusher in one direction. longitudinal output of the blade, for which the pusher element comprises a thrust abutment, engaged in a longitudinal direction of output of the blade with a counter stop of blade holder and for which the abutment and the abutment comprise curved engagement edges.
  • the curved engagement edges are more particularly adapted to allow a release in rotation of these stops without constraint towards the front of the blade holder.
  • the radius of curvature of the curved front edge of the abutment of the blade holder is greater than the radius of curvature of the curved front edge of the abutment of the plunger engaging with the front edge of the abutment of the blade holder.
  • the blade holder comprises a pin disposed at the end of an arm extending the blade holder rearwardly.
  • the knife comprises a slide receiving the pin, the pin being adapted to slide in the slide.
  • the slide is preferably located in the lower part of the knife so that the pin remains below or in alignment with a lower portion of the thrust stop.
  • the knife advantageously comprises a stopper of the pin at the end of the slide on the output side of the blade.
  • the stop stop is preferably an elastic stop.
  • a horizontal axis, parallel to a sliding axis of the blade holder in the body of the knife and passing through the pin passes through the bottom of the stop and along the edge of the blade.
  • the position of the pin on the blade holder is adapted so that, when the blade holder rotates from a longitudinal output position to a cutting position inclined by rotation around the pin of an angle ⁇ , the distance to the pin projected on the axis of the driving abutment of the blade holder is reduced by a factor cos ⁇ .
  • the knife comprises means adapted to laterally move aside the driving abutment of the pusher of the blade holder driving abutment, these means comprising a first lateral ramp on the blade holder and a second lateral ramp on the pusher.
  • the thrust stop and the second ramp are advantageously carried by a flexible arm connected to the pusher.
  • a knife according to the present invention is shown in figure 1 .
  • It comprises a knife body 1 provided with a housing for receiving a blade 2 protruding from the front of the knife under the action of a handle 8 disposed under a rear portion of the knife body.
  • the knife body comprises a left half shell 1a and a right half shell 1b hidden and a hatch 1c which allows to change the blade.
  • the knife comprises a pusher 4 for driving the blade holder in a longitudinal direction of output of the blade.
  • the pusher element comprises a thrust abutment 5 intended to engage in a longitudinal direction of output of the blade with a counter-abutment 6 of the blade holder.
  • the pusher slides in the knife body and is guided by rails 41 received in grooves 40 of the pusher.
  • the pusher and the blade holder comprise means 15, 16 adapted to release the thrust stop of the abutment under the action of a rotation of the blade holder and the blade to an inclined cutting position as shown in FIG. figure 3 .
  • the means adapted to release the thrust stop of the abutment comprise a first lateral ramp 15 on the blade holder and a second lateral ramp 16 on the pusher.
  • the thrust bearing 5 and the second ramp 16 are carried by a flexible arm 7 connected to the pusher.
  • the figure 3 represents the knife of the figure 2 blade output cutting position, ie blade holder 3 bears against the inner wall in the upper part of the shell 1 b.
  • This position is obtained when the object to be cut is pressed.
  • the blade holder has in its upper front portion of the door a tooth 13 and the knife body comprises a housing 14 for receiving the tooth when the blade holder is in the cutting position.
  • the blade In the cutting position, the blade is inclined relative to the axis of the knife.
  • the blade holder is biased towards the rear by a spring 28 for returning the blade holder, represented in particular by Figure 6A .
  • This spring clings to a pin 29 in the lower part of the right shell 1b of the knife body shown in FIG. figure 7 .
  • the axis of the spring 28 is inclined so that the return spring 28 pulls the blade holder down which facilitates the retraction of the blade holder when the blade is no longer in contact with the object to be cut.
  • the blade holder for its part is recalled towards the rear by its return spring 28.
  • the ramp 16 pushes the ramp 15 which bends the arm 7 of the pusher laterally and releases the abutment 5 of the abutment 6 as more particularly shown in FIG. figure 4D .
  • the latter comprises a pin 9 shown in FIG. Figure 6A .
  • This piece is made at the free end of a butt ending an arm 12 extending the blade holder 3 rearwardly.
  • This piece is received in a slide 10 of the knife body shown in FIG. figure 7 .
  • the pin is stopped at the end of advancing stroke of the blade holder by a stop 11 shown in particular at the figure 7 .
  • the starting position of the blade holder is detailed at figure 5 .
  • the pin 9 is at one end of the slide 10 aligned with the stop of the blade holder 6.
  • the pusher 4 is set back relative to the blade holder, the drive stops not being engaged.
  • This abutment is for example made with a small segment of rubber cylinder to dampen shocks during the support on the handle and the advance of the pusher and the blade holder and make up the games and tolerances of these parts.
  • This stopper disposed at the end of the slide 10 holds the pin 9 which forms an axis of rotation of the blade holder to move it from an advanced position to an inclined cutting position.
  • the pin 9 is disposed at the end of an arm 12 extending the blade holder 3 rearwardly so as to enlarge the radius of rotation of the blade holder.
  • the stopper 11 is preferably a resilient abutment for example rubber or silicone.
  • the pin 9, the slide 10 and the stopper 11 are located at the bottom of the knife so that the pin remains below or in alignment with a lower part of the thrust bearing 5.
  • This axis passes through the bottom of the abutment 6 and runs along the edge of the blade 2.
  • the driving abutment 6 in particular in its upward rotational movement, recoils with respect to an axis passing through the axis of the slide 10 and the blade holder generally retracts.
  • FIGS. Figures 4A to 4D The various positions taken by the thrust stops 5, 6 of the blade holder are illustrated in FIGS. Figures 4A to 4D .
  • the stops are released from each other because the radius of curvature centered on the pawn 9 of the curved front edge 6a of the abutment of the blade holder is greater than the radius of curvature of the curved front edge of the abutment 5 of the pusher engaging with the front edge of the abutment of the blade holder.
  • This position is represented in figure 4C .
  • the arm 7 flexes when the ramps 15, 16 of the blade holder and the arm engage, and the drive stop 5 and the end of the arm 7 move laterally away from the stop 6 as represented in figure 4D .
  • a release of the support on the workpiece then allows the blade holder to enter the knife under the action of the spring 28.

Abstract

The knife has a body provided with a housing to receive a blade (2), and a pusher (4) for driving a cutter bar (3) in longitudinal direction of an outlet of the blade. The pusher and the cutter bar are provided with disengaging units for disengaging a thrust bearing (5) from a counter thrust bearing (6) under action of rotation of the counter thrust bearing and the thrust bearing toward a inclined cutting position. The thrust bearing and the counter thrust bearing comprise curve engagement edges.

Description

La présente invention concerne un couteau de sécurité en ce qu'il comporte une lame se rétractant automatiquement en fin de coupe.The present invention relates to a safety knife in that it comprises a blade retracting automatically at the end of cutting.

Un exemple de couteau de sécurité connu est donné par le document EP 1 946 897 A1 qui prévoit un porte lame déplacé par un poussoir au moyen de butées d'entraînement d'une position reculée vers une position avancée puis se déplaçant par rotation de la position avancée vers une position de coupe inclinée pour laquelle une dent au sommet du porte lame vient s'insérer dans une découpe du boîtier du couteau.An example of a known safety knife is given by the document EP 1 946 897 A1 which provides a blade holder moved by a pusher by means of driving abutments from a retracted position to an advanced position and then rotated from the advanced position to an inclined cutting position for which a tooth at the top of the blade holder comes fit into a cutout of the knife housing.

Lors de la rotation du porte lame, les butées d'entraînement sont désengagées par un système à rampes tel que connu dans le document EP 1 273 399 A1 .During rotation of the blade holder, the drive stops are disengaged by a ramp system as known in the document EP 1 273 399 A1 .

En fin de coupe, le porte lame rappelé par un ressort revient en position arrière.At the end of cutting, the spring loaded blade holder returns to the rear position.

La présente invention vise à perfectionner un tel couteau en assurant une position plus précise du porte lame en position avancée et une rotation plus maitrisée de sorte que la dent vienne plus précisément s'insérer dans la découpe du boîtier du couteau.The present invention aims to improve such a knife by ensuring a more precise position of the blade holder in the advanced position and a more controlled rotation so that the tooth comes more precisely fit into the cutout of the knife housing.

Pour ce faire la présente invention propose un couteau à lame rétractable automatiquement comportant un corps de couteau pourvu d'un logement de réception d'une lame solidaire d'un porte lame et pourvu d'un poussoir d'entraînement du porte lame dans une direction longitudinale de sortie de la lame, pour lequel l'élément poussoir comporte une butée de poussée, en prise dans une direction longitudinale de sortie de la lame avec une contre butée du porte lame et pour lequel la butée et la contre butée comportent des arêtes d'engagement courbes.To this end, the present invention proposes a knife with a retractable blade that automatically comprises a knife body provided with a housing for receiving a blade integral with a blade holder and provided with a blade blade drive pusher in one direction. longitudinal output of the blade, for which the pusher element comprises a thrust abutment, engaged in a longitudinal direction of output of the blade with a counter stop of blade holder and for which the abutment and the abutment comprise curved engagement edges.

Les arêtes d'engagement courbes sont plus particulièrement adaptées à permettre un dégagement en rotation de ces butées sans contrainte vers l'avant du porte lame.The curved engagement edges are more particularly adapted to allow a release in rotation of these stops without constraint towards the front of the blade holder.

Avantageusement, le rayon de courbure de l'arête frontale courbe de la contre butée du porte lame est plus important que le rayon de courbure de l'arête frontale courbe de la butée du poussoir s'engageant avec l'arête frontale de la contre butée du porte lame.Advantageously, the radius of curvature of the curved front edge of the abutment of the blade holder is greater than the radius of curvature of the curved front edge of the abutment of the plunger engaging with the front edge of the abutment of the blade holder.

Selon un mode de réalisation avantageux, le porte lame comporte un pion disposé en bout d'un bras prolongeant le porte lame vers l'arrière.According to an advantageous embodiment, the blade holder comprises a pin disposed at the end of an arm extending the blade holder rearwardly.

Préférablement, le couteau comporte une glissière recevant le pion, le pion étant adapté à coulisser dans la glissière.Preferably, the knife comprises a slide receiving the pin, the pin being adapted to slide in the slide.

La glissière est préférablement située en partie basse du couteau de sorte que le pion reste au dessous ou en alignement avec une partie inférieure de la butée de poussée.The slide is preferably located in the lower part of the knife so that the pin remains below or in alignment with a lower portion of the thrust stop.

Le couteau comporte avantageusement une butée d'arrêt du pion en bout de glissière côté sortie de la lame.The knife advantageously comprises a stopper of the pin at the end of the slide on the output side of the blade.

La butée d'arrêt est préférablement une butée élastique.The stop stop is preferably an elastic stop.

Selon un mode de réalisation avantageux, un axe horizontal, parallèle à un axe de coulissement du porte lame dans le corps du couteau et passant par le pion passe par le bas de la butée et longe le tranchant de la lame.According to an advantageous embodiment, a horizontal axis, parallel to a sliding axis of the blade holder in the body of the knife and passing through the pin passes through the bottom of the stop and along the edge of the blade.

Préférablement, la position du pion sur le porte lame est adaptée pour que, lorsque le porte lame tourne d'une position longitudinale de sortie vers une position de coupe inclinée par rotation autour du pion d'un angle α, la distance au pion projetée sur l'axe de la butée de d'entraînement du porte lame est réduite d'un facteur cos α .Preferably, the position of the pin on the blade holder is adapted so that, when the blade holder rotates from a longitudinal output position to a cutting position inclined by rotation around the pin of an angle α, the distance to the pin projected on the axis of the driving abutment of the blade holder is reduced by a factor cos α.

Le couteau comporte avantageusement des moyens adaptés pour à écarter latéralement la butée d'entraînement du poussoir de la butée d'entraînement du porte lame, ces moyens comportant une première rampe latérale sur le porte lame et une seconde rampe latérale sur le poussoir.Advantageously, the knife comprises means adapted to laterally move aside the driving abutment of the pusher of the blade holder driving abutment, these means comprising a first lateral ramp on the blade holder and a second lateral ramp on the pusher.

La butée de poussée et la seconde rampe sont avantageusement portées par un bras flexible raccordé au poussoir.The thrust stop and the second ramp are advantageously carried by a flexible arm connected to the pusher.

D'autres caractéristiques et avantages de l'invention seront apparents à la lecture de la description qui suit d'un exemple de réalisation non limitatif de l'invention accompagné des dessins qui représentent:

en figure 1:
une vue de côté d'un couteau réalisé selon l'invention;
aux figures 2A et 2B:
des vues de côté du couteau de la figure 1 ouvert lame en position reculée et en position avancée;
en figure 3:
une vue de côté du couteau de la figure 1 ouvert lame sortie en position de coupe;
aux figures 4A à 4D:
des vues de détail des butées de manoeuvre d'un couteau selon l'invention;
en figure 5:
une vue de côté d'un détail d'un porte lame et d'un poussoir selon un mode de réalisation de l'invention en position dans la coque droite du couteau de la figure 1 ;
aux figures 6A et 6B:
des vues respectivement en perspective et de côté du porte lame de la figure 5;
en figure 7:
une vue de la coque droite du couteau de la figure 5
Other characteristics and advantages of the invention will become apparent on reading the following description of a nonlimiting exemplary embodiment of the invention accompanied by the drawings which represent:
in Figure 1:
a side view of a knife made according to the invention;
in FIGS. 2A and 2B:
side views of the knife from the figure 1 open blade in retracted position and in advanced position;
in Figure 3:
a side view of the knife from the figure 1 open blade outlet in cutting position;
in FIGS. 4A to 4D:
detailed views of the operating stops of a knife according to the invention;
in Figure 5:
a side view of a detail of a blade holder and a pusher according to one embodiment of the invention in position in the right shell of the knife of the figure 1 ;
in FIGS. 6A and 6B:
respectively perspective and side views of the blade holder of the figure 5 ;
in Figure 7:
a view of the right hull of the knife of the figure 5

Un couteau conforme à la présente invention est représenté en figure 1.A knife according to the present invention is shown in figure 1 .

II comporte un corps de couteau 1 pourvu d'un logement de réception d'une lame 2 sortant par l'avant du couteau sous l'action d'une poignée 8 disposée sous une partie arrière du corps de couteau.It comprises a knife body 1 provided with a housing for receiving a blade 2 protruding from the front of the knife under the action of a handle 8 disposed under a rear portion of the knife body.

Le corps de couteau comporte une demi coque gauche 1a et une demi coque droite 1 b masquée ainsi qu'une trappe 1 c qui permet de changer la lame.The knife body comprises a left half shell 1a and a right half shell 1b hidden and a hatch 1c which allows to change the blade.

Comme représenté aux figures 2A et 2B qui représentent le couteau ouvert, c'est à dire coque gauche et trappe retirées, lame 2 rentrée en position d'attente pour la figure 2A et lame sortie en figure 2B, la lame est solidaire d'un porte lame 3.As represented in Figures 2A and 2B which represent the open knife, ie left hull and hatch removed, blade 2 returned to the waiting position for the Figure 2A and blade output in Figure 2B , the blade is secured to a blade holder 3.

En référence à la figure 2A, le couteau comporte un poussoir 4 d'entraînement du porte lame dans une direction longitudinale de sortie de la lame.With reference to the Figure 2A , the knife comprises a pusher 4 for driving the blade holder in a longitudinal direction of output of the blade.

L'élément poussoir comporte une butée de poussée 5, destinée à venir en prise dans une direction longitudinale de sortie de la lame avec une contre butée 6 du porte lame.The pusher element comprises a thrust abutment 5 intended to engage in a longitudinal direction of output of the blade with a counter-abutment 6 of the blade holder.

Le poussoir coulisse dans le corps de couteau et est guidé par des rails 41 reçus dans des rainures 40 du poussoir.The pusher slides in the knife body and is guided by rails 41 received in grooves 40 of the pusher.

Le poussoir et le porte lame comportent des moyens 15, 16 adaptés pour dégager la butée de poussée de la contre butée sous l'action d'une rotation du porte lame et de la lame vers une position de coupe inclinée comme représentée en figure 3.The pusher and the blade holder comprise means 15, 16 adapted to release the thrust stop of the abutment under the action of a rotation of the blade holder and the blade to an inclined cutting position as shown in FIG. figure 3 .

Selon l'exemple, les moyens adaptés pour dégager la butée de poussée de la contre butée comportent une première rampe latérale 15 sur le porte lame et une seconde rampe latérale 16 sur le poussoir.According to the example, the means adapted to release the thrust stop of the abutment comprise a first lateral ramp 15 on the blade holder and a second lateral ramp 16 on the pusher.

La butée de poussée 5 et la seconde rampe 16 sont portées par un bras flexible 7 raccordé au poussoir.The thrust bearing 5 and the second ramp 16 are carried by a flexible arm 7 connected to the pusher.

La figure 3 représente le couteau de la figure 2 lame sortie en position de coupe, c'est à dire porte lame 3 en appui contre la paroi intérieure en partie haute de la coque 1 b.The figure 3 represents the knife of the figure 2 blade output cutting position, ie blade holder 3 bears against the inner wall in the upper part of the shell 1 b.

Cette position est obtenue lorsque l'on appuie sur l'objet à couper.This position is obtained when the object to be cut is pressed.

Selon l'exemple, pour maintenir le porte lame 3 et la lame 2 en position de coupe, le porte lame comporte dans sa partie supérieure avant du porte une dent 13 et le corps du couteau comporte un logement 14 de réception de la dent lorsque le porte lame est en position de coupe.According to the example, to maintain the blade holder 3 and the blade 2 in the cutting position, the blade holder has in its upper front portion of the door a tooth 13 and the knife body comprises a housing 14 for receiving the tooth when the blade holder is in the cutting position.

II est envisageable de remplacer la dent et le logement par des moyens de friction ou de prévoir un simple appui.It is conceivable to replace the tooth and the housing by friction means or to provide a simple support.

En position de coupe, la lame est inclinée par rapport à l'axe du couteau.In the cutting position, the blade is inclined relative to the axis of the knife.

Le porte lame est rappelé vers l'arrière par un ressort 28 de rappel du porte lame représenté en particulier en figure 6A.The blade holder is biased towards the rear by a spring 28 for returning the blade holder, represented in particular by Figure 6A .

Ce ressort s'accroche sur un téton 29 en partie basse de la coque droite 1 b du corps de couteau représenté en figure 7.This spring clings to a pin 29 in the lower part of the right shell 1b of the knife body shown in FIG. figure 7 .

L'axe du ressort 28 est incliné de sorte que le ressort de rappel 28 tire le porte lame vers le bas ce qui facilite la rentrée du porte lame lorsque la lame n'est plus en contact avec l'objet à couper.The axis of the spring 28 is inclined so that the return spring 28 pulls the blade holder down which facilitates the retraction of the blade holder when the blade is no longer in contact with the object to be cut.

Comme il sera vu plus bas, dans la position de coupe, les butées 5 et 6 ne sont plus en engagement.As will be seen below, in the cutting position, the stops 5 and 6 are no longer in engagement.

En effet, le fonctionnement du couteau est le suivant.Indeed, the operation of the knife is the following.

Lorsque la poignée 8 est relâchée, position de la figure 2A, la poignée est rappelée en position sortie par un ressort 30 de rappel disposé entre la coque droite et une bielle 20 manoeuvrée par la poignée et entraînant le poussoir ce qui tire vers l'arrière le poussoir 4.When the handle 8 is released, the position of the Figure 2A , the handle is returned to the extended position by a return spring disposed between the right shell and a rod 20 operated by the handle and driving the pusher which pulls back the pusher 4.

Le porte lame pour sa part est rappelé vers l'arrière par son ressort de rappel 28.The blade holder for its part is recalled towards the rear by its return spring 28.

Lorsque l'on appuie sur la poignée on fait tourner la bielle 20 qui fait avancer le poussoir 4 qui pousse lui même le porte lame 3, au travers des butées 5, 6 qui sont en prise.When pressing the handle is rotated the rod 20 which advances the pusher 4 which itself pushes the blade holder 3, through the abutments 5, 6 which are engaged.

La poussée vers l'avant s'effectue jusqu'à arrêt du porte lame dont un pion d'arrêt vient en contact avec une butée d'arrêt du corps du couteau. Cette position est la position de la figure 2B où l'on a retiré la poignée pour une meilleur visibilité du porte lame 3 et de son bras arrière 12 ainsi que la position du ressort 30 en extension.Forward thrust is carried out until the blade holder stops, a stopper pin comes into contact with a stopper of the knife body. This position is the position of the Figure 2B where the handle was removed for better visibility of the blade holder 3 and its rear arm 12 and the position of the spring 30 in extension.

Pour passer en position de coupe on appuie la pointe du couteau sur l'objet à couper ce qui fait basculer le porte lame en rotation vers la position de coupe, position de la figure 3.To move to the cutting position, the tip of the knife is pressed against the object to be cut, which causes the blade holder to rotate towards the cutting position, the position of the blade. figure 3 .

Lors de la rotation du porte lame, la rampe 16, repousse la rampe 15 ce qui fait fléchir le bras 7 du poussoir latéralement et dégage la butée 5 de la contre butée 6 comme plus particulièrement représenté en figure 4D.During rotation of the blade carrier, the ramp 16 pushes the ramp 15 which bends the arm 7 of the pusher laterally and releases the abutment 5 of the abutment 6 as more particularly shown in FIG. figure 4D .

Pour mieux maitriser la rotation du porte lame, ce dernier comporte un pion 9 représenté en figure 6A.To better control the rotation of the blade holder, the latter comprises a pin 9 shown in FIG. Figure 6A .

Ce pion est réalisé au bout libre d'une crosse terminant un bras 12 prolongeant le porte lame 3 vers l'arrière.This piece is made at the free end of a butt ending an arm 12 extending the blade holder 3 rearwardly.

Ce pion est reçu dans une glissière 10 du corps de couteau représentée à la figure 7.This piece is received in a slide 10 of the knife body shown in FIG. figure 7 .

Le pion est arrêté en fin de course d'avancée du porte lame par une butée d'arrêt 11 représentée en particulier à la figure 7.The pin is stopped at the end of advancing stroke of the blade holder by a stop 11 shown in particular at the figure 7 .

La position de départ du porte lame est détaillée à la figure 5.The starting position of the blade holder is detailed at figure 5 .

Le pion 9 est à un bout de la glissière 10 alignée avec la butée du porte lame 6.The pin 9 is at one end of the slide 10 aligned with the stop of the blade holder 6.

Le poussoir 4 est en retrait par rapport au porte lame, les butées d'entraînement n'étant pas en prise.The pusher 4 is set back relative to the blade holder, the drive stops not being engaged.

A l'extrémité opposée au pion de la glissière se trouve la butée 11.At the end opposite to the slider pin is the stop 11.

Cette butée est par exemple réalisée avec un petit segment de cylindre caoutchouc pour amortir les chocs lors de l'appui sur la poignée et de l'avancée du poussoir et du porte lame et rattraper les jeux et tolérances de ces pièces.This abutment is for example made with a small segment of rubber cylinder to dampen shocks during the support on the handle and the advance of the pusher and the blade holder and make up the games and tolerances of these parts.

Cette butée d'arrêt disposée en fin de glissière 10 retient le pion 9 qui forme un axe de rotation du porte lame pour le faire passer d'une position avancée à une position de coupe inclinée.This stopper disposed at the end of the slide 10 holds the pin 9 which forms an axis of rotation of the blade holder to move it from an advanced position to an inclined cutting position.

Le pion 9 est disposé en bout d'un bras 12 prolongeant le porte lame 3 vers l'arrière en sorte d'agrandir le rayon de rotation du porte lame.The pin 9 is disposed at the end of an arm 12 extending the blade holder 3 rearwardly so as to enlarge the radius of rotation of the blade holder.

Pour rattraper les jeux des diverses pièces du couteau, la butée d'arrêt 11 est préférablement une butée élastique par exemple caoutchouc ou silicone.To make up the play of the various parts of the knife, the stopper 11 is preferably a resilient abutment for example rubber or silicone.

Le pion 9, la glissière 10 et la butée d'arrêt 11 sont situés en partie basse du couteau de sorte que le pion reste au dessous ou en alignement avec une partie inférieure de la butée de poussée 5.The pin 9, the slide 10 and the stopper 11 are located at the bottom of the knife so that the pin remains below or in alignment with a lower part of the thrust bearing 5.

Sur cette figure 5 en particulier sont représentées les arêtes d'engagement courbes des butées d'entraînement 5 et 6.On this figure 5 in particular are shown the curved engagement edges of the drive stops 5 and 6.

Ces arêtes d'engagement courbes permettent un dégagement en rotation de ces butées sans contrainte vers l'avant du porte lame.These curved engagement edges allow a release in rotation of these stops without constraint towards the front of the blade holder.

Sur la figure 6B est représenté l'axe horizontal A passant par le pion 9.On the Figure 6B is represented the horizontal axis A passing through the pin 9.

Cet axe passe par le bas de la butée 6 et longe le tranchant de la lame 2.This axis passes through the bottom of the abutment 6 and runs along the edge of the blade 2.

Lors de la rotation du porte lame autour d'un axe de rotation défini par le pion 9, l'ensemble des points du porte lame et de la lame au dessus de cet axe se déplacent vers le haut et vers l'arrière par rapport à un repère orthogonal x, y ayant un axe vertical orienté vers le haut et un axe horizontal orienté vers l'avant du couteau.When rotating the blade holder about an axis of rotation defined by the pin 9, all the points of the blade holder and the blade above this axis move upwards and backwards relative to an orthogonal x, y coordinate having a vertical axis pointing upwards and a horizontal axis pointing towards the front of the knife.

Lorsque par exemple le porte lame tourne vers une position définie par l'axe A', obtenu par rotation de l'axe A autour du pion 9 d'un angle α, l'ensemble des points du porte lame et de la lame à partir de l'axe A et vers le haut du porte lame, et en particulier la butée d'entraînement 6, auront décrit un arc de cercle et leur distance au pion projetée sur l'axe A sera réduite d'un facteur cos α .When for example the blade holder rotates to a position defined by the axis A ', obtained by rotation of the axis A around the pin 9 by an angle α, the set of points of the blade holder and the blade from of the axis A and upwards of the blade holder, and in particular the driving abutment 6, have described a circular arc and their distance to the pin projected on the axis A will be reduced by a factor cos α.

De la sorte, lors de la rotation du porte lame 3 la butée d'entraînement 6 notamment dans son mouvement rotatif vers le haut recule par rapport à un axe passant par l'axe de la glissière 10 et le porte lame recule globalement.In this way, during the rotation of the blade holder 3, the driving abutment 6, in particular in its upward rotational movement, recoils with respect to an axis passing through the axis of the slide 10 and the blade holder generally retracts.

Les diverses positions que prennent les butées 5, 6 de poussée du porte lame sont illustrées aux figures 4A à 4D.The various positions taken by the thrust stops 5, 6 of the blade holder are illustrated in FIGS. Figures 4A to 4D .

En figure 4A le porte lame et le poussoir sont en position reculée. Les butées 5, 6 sont hors de prise.In Figure 4A the blade holder and the pusher are in the retracted position. The stops 5, 6 are out of reach.

Lorsque le poussoir avance, il entraîne le porte lame et les butées 5, 6 sont en prise, l'arête frontale courbe de la butée 5 venant sous l'arête frontale courbe 6a de la butée 6. Cette position est représentée à la figure 4B.When the pusher advances, it drives the blade holder and the abutments 5, 6 are engaged, the curved front edge of the abutment 5 coming under the curved front edge 6a of the abutment 6. This position is represented in FIG. Figure 4B .

Une fois le porte lame en butée avant, lorsque le porte lame est mis en rotation par l'appui sur l'objet à couper, les butées se dégagent l'une de l'autre du fait que le rayon de courbure centré sur le pion 9 de l'arête frontale courbe 6a de la butée du porte lame est plus important que le rayon de courbure de l'arête frontale courbe de la butée 5 du poussoir s'engageant avec l'arête frontale de la butée du porte lame.Once the blade holder abuts before, when the blade holder is rotated by the support on the object to be cut, the stops are released from each other because the radius of curvature centered on the pawn 9 of the curved front edge 6a of the abutment of the blade holder is greater than the radius of curvature of the curved front edge of the abutment 5 of the pusher engaging with the front edge of the abutment of the blade holder.

Cette position est représentée à la figure 4C.This position is represented in figure 4C .

Toujours lorsque le porte lame tourne autour du pion, le bras 7 fléchit lors de l'engagement des rampes 15, 16 du porte lame et du bras et la butée d'entraînement 5 et bout de bras 7 s'écarte latéralement de la butée 6. comme représenté à la figure 4D.Still when the blade holder rotates around the pin, the arm 7 flexes when the ramps 15, 16 of the blade holder and the arm engage, and the drive stop 5 and the end of the arm 7 move laterally away from the stop 6 as represented in figure 4D .

Un relâchement de l'appui sur la pièce à couper permet alors au porte lame de rentrer dans le couteau sous l'action du ressort 28.A release of the support on the workpiece then allows the blade holder to enter the knife under the action of the spring 28.

L'invention définie par la portée des revendications qui suivent n'est pas limitée à l'exemple représenté et notamment le dispositif d'entraînement du poussoir peut être un système différent du système à bielle et poignée rotative représenté.The invention defined by the scope of the following claims is not limited to the example shown and in particular the drive device of the pusher may be a different system of the connecting rod system and rotary handle shown.

Claims (12)

Couteau à lame rétractable automatiquement comportant un corps de couteau (1) pourvu d'un logement de réception d'une lame (2) solidaire d'un porte lame (3) et pourvu d'un poussoir (4) d'entraînement du porte lame dans une direction longitudinale de sortie de la lame, pour lequel l'élément poussoir comporte une butée de poussée (5), en prise dans une direction longitudinale de sortie de la lame avec une contre butée (6) du porte lame, caractérisé en ce que la butée et la contre butée comportent des arêtes d'engagement courbes.Automatic retracting blade knife comprising a knife body (1) provided with a receiving housing of a blade (2) integral with a blade holder (3) and provided with a push-piece (4) for driving the door blade in a longitudinal direction of output of the blade, for which the pusher element comprises a thrust abutment (5), engaged in a longitudinal direction of output of the blade with an abutment (6) of the blade holder, characterized in that the abutment and the abutment against comprise engaging ribs curves. Couteau à lame rétractable automatiquement selon la revendication 1 caractérisé en ce que les arêtes d'engagement courbes sont adaptées à permettre un dégagement en rotation de ces butées sans contrainte vers l'avant du porte lame.Automatic retractable blade knife according to claim 1 characterized in that the curved engagement edges are adapted to allow a release in rotation of these stops without constraint forward of the blade holder. Couteau à lame rétractable automatiquement selon la revendication 1 ou 2 caractérisé en ce que le rayon de courbure de l'arête frontale courbe (6a) de la contre butée (6) du porte lame est plus important que le rayon de courbure de l'arête frontale courbe de la butée (5) du poussoir s'engageant avec l'arête frontale de la contre butée du porte lame.Automatic retracting knife according to Claim 1 or 2, characterized in that the radius of curvature of the curved front edge (6a) of the abutment (6) of the blade holder is greater than the radius of curvature of the ridge. curved front end of the abutment (5) of the pusher engaging with the front edge of the abutment of the blade holder. Couteau à lame rétractable automatiquement selon la revendication 1, 2 ou 3 caractérisé en ce que le porte lame comporte un pion disposé en bout d'un bras (12) prolongeant le porte lame (3) vers l'arrière.Automatic retractable blade knife according to claim 1, 2 or 3 characterized in that the blade holder comprises a pin disposed at the end of an arm (12) extending the blade holder (3) rearwardly. Couteau à lame rétractable automatiquement selon la revendication 4 caractérisé en ce qu'il comporte une glissière (10) recevant le pion (9), le pion (9) étant adapté à coulisser dans la glissière.Automatic retracting blade knife according to claim 4 characterized in that it comprises a slide (10) receiving the pin (9), the pin (9) being adapted to slide in the slide. Couteau à lame rétractable automatiquement selon la revendication 5 caractérisé en ce que la glissière (10) est située en partie basse du couteau de sorte que le pion reste au dessous ou en alignement avec une partie inférieure de la butée de poussée (5).Automatic retractable blade knife according to claim 5 characterized in that the slide (10) is located at the bottom of the knife so that the pin remains below or in alignment with a lower portion of the thrust bearing (5). Couteau selon l'une quelconque des revendications 4 à 6 caractérisé en ce qu'il comporte une butée d'arrêt (11) du pion (9) en bout de glissière (10) côté sortie de la lame.Knife according to any one of claims 4 to 6 characterized in that it comprises a stop (11) of the pin (9) at the end of the slide (10) on the output side of the blade. Couteau selon la revendication 7 caractérisé en ce que la butée d'arrêt (11) est une butée élastique.Knife according to claim 7 characterized in that the stopper (11) is an elastic stop. Couteau selon l'une quelconque des revendications 4 à 8 caractérisé en ce qu'un axe horizontal (A), parallèle à un axe de coulissement du porte lame dans le corps du couteau et passant par le pion (9) passe par le bas de la butée (6) et longe le tranchant de la lame (2).Knife according to any one of claims 4 to 8 characterized in that a horizontal axis (A), parallel to a sliding axis of the blade holder in the body of the knife and passing through the pin (9) passes through the bottom of the abutment (6) and along the cutting edge of the blade (2). Couteau selon la revendication 9 caractérisé en ce que la position du pion sur le porte lame est adaptée pour que, lorsque le porte lame tourne d'une position longitudinale de sortie vers une position de coupe inclinée par rotation autour du pion (9) d'un angle (α), la distance au pion projetée sur l'axe (A) de la butée de d'entraînement (6) du porte lame est réduite d'un facteur cos α .Knife according to claim 9 characterized in that the position of the pin on the blade holder is adapted so that, when the blade holder rotates from a longitudinal output position to a cutting position inclined by rotation around the pin (9) of an angle (α), the distance to the pin projected on the axis (A) of the drive stop (6) of the blade holder is reduced by a factor cos α. Couteau selon l'une quelconque des revendications précédentes caractérisé en ce qu'il comporte des moyens adaptés pour à écarter latéralement la butée (5) d'entraînement du poussoir de la butée d'entraînement (6) du porte lame, ces moyens comportant une première rampe latérale (15) sur le porte lame et une seconde rampe latérale (16) sur le poussoir.Knife according to any one of the preceding claims, characterized in that it comprises means adapted for laterally spacing the abutment (5) for driving the pusher from the driving abutment (6) of the blade holder, these means comprising a first lateral ramp (15) on the blade holder and a second lateral ramp (16) on the pusher. Couteau selon la revendication 11 caractérisé en ce que la butée de poussée (5) et la seconde rampe (16) sont portées par un bras flexible (7) raccordé au poussoir.Knife according to claim 11 characterized in that the thrust bearing (5) and the second ramp (16) are carried by a flexible arm (7) connected to the pusher.
EP11166218.5A 2010-05-21 2011-05-16 Safety knife Not-in-force EP2388113B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1053946A FR2960174B1 (en) 2010-05-21 2010-05-21 SAFETY KNIFE

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EP2388113A1 true EP2388113A1 (en) 2011-11-23
EP2388113B1 EP2388113B1 (en) 2013-05-01
EP2388113B2 EP2388113B2 (en) 2017-01-11

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EP (1) EP2388113B2 (en)
FR (1) FR2960174B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8776380B1 (en) * 2011-04-25 2014-07-15 Elwood Dean Quimby Utility knife with retractable blade
FR3001908A1 (en) * 2013-02-14 2014-08-15 Mure Et Peyrot BLADE HOLDER DEVICE WITH AUTOMATIC BLADE RETENTION MECHANISM AT THE END OF CUTTING AND SAFETY KNIFE INCLUDING THE SAME
US20190022879A1 (en) * 2014-05-06 2019-01-24 Martor Kg Knife with automatic blade retraction

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273399A1 (en) 2001-07-06 2003-01-08 Mure & Peyrot Cutting device with retractable blade
EP1864766A1 (en) * 2006-06-06 2007-12-12 Olfa Corporation Safety cutter knife
EP1946897A1 (en) 2007-01-19 2008-07-23 Mure et Peyrot Knife with automatically retractable blade
EP1985417A1 (en) * 2007-04-27 2008-10-29 Mure et Peyrot Safety knife with system for automatic blade retraction after cutting

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1273399A1 (en) 2001-07-06 2003-01-08 Mure & Peyrot Cutting device with retractable blade
EP1864766A1 (en) * 2006-06-06 2007-12-12 Olfa Corporation Safety cutter knife
EP1946897A1 (en) 2007-01-19 2008-07-23 Mure et Peyrot Knife with automatically retractable blade
EP1985417A1 (en) * 2007-04-27 2008-10-29 Mure et Peyrot Safety knife with system for automatic blade retraction after cutting

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8776380B1 (en) * 2011-04-25 2014-07-15 Elwood Dean Quimby Utility knife with retractable blade
FR3001908A1 (en) * 2013-02-14 2014-08-15 Mure Et Peyrot BLADE HOLDER DEVICE WITH AUTOMATIC BLADE RETENTION MECHANISM AT THE END OF CUTTING AND SAFETY KNIFE INCLUDING THE SAME
WO2014125004A1 (en) * 2013-02-14 2014-08-21 Mure Et Peyrot Blade holder device having a mechanism for automatic blade retraction at the end of cutting and safety knife comprising same
US20190022879A1 (en) * 2014-05-06 2019-01-24 Martor Kg Knife with automatic blade retraction
US10814505B2 (en) * 2014-05-06 2020-10-27 Martor Kg Knife with automatic blade retraction

Also Published As

Publication number Publication date
FR2960174A1 (en) 2011-11-25
FR2960174B1 (en) 2012-09-28
EP2388113B2 (en) 2017-01-11
EP2388113B1 (en) 2013-05-01

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