EP2359990B1 - Safety knife - Google Patents

Safety knife Download PDF

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Publication number
EP2359990B1
EP2359990B1 EP20110154462 EP11154462A EP2359990B1 EP 2359990 B1 EP2359990 B1 EP 2359990B1 EP 20110154462 EP20110154462 EP 20110154462 EP 11154462 A EP11154462 A EP 11154462A EP 2359990 B1 EP2359990 B1 EP 2359990B1
Authority
EP
European Patent Office
Prior art keywords
blade holder
knife
blade
pusher
stop
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.)
Not-in-force
Application number
EP20110154462
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German (de)
French (fr)
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EP2359990A1 (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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Filing date
Publication date
Application filed by Mure et Peyrot SAS filed Critical Mure et Peyrot SAS
Publication of EP2359990A1 publication Critical patent/EP2359990A1/en
Application granted granted Critical
Publication of EP2359990B1 publication Critical patent/EP2359990B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B26B5/003—Hand knives with one or more detachable blades with blades being slid out of handle immediately prior to use comprising retraction means for the blade or the blade holder

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 .
  • EP 1 864 766 A1 discloses a retractable blade knife automatically according to the preamble of claim 1.
  • 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 an abutment of the blade holder, the pusher and the blade holder having means adapted to releasing the thrust stop of the abutment under the action of a rotation of the blade holder and the blade to an inclined cutting position
  • the blade holder comprises a pin received in a slide of the knife body, the pin being stopped at the end of advancing stroke of the blade holder by a stop at the end of the slide and forming an axis of rotation of the blade holder to move it from an advanced position to an inclined cutting position.
  • the stopper is an elastic stop.
  • the pin is advantageously disposed at the end of an arm extending the blade holder rearward so as to enlarge the radius of rotation of the blade holder.
  • the blade holder comprises a tooth in the upper part of the front of the blade holder and a receiving housing of the tooth in the knife body.
  • a support on an object to be cut causes a rotation of the blade holder around the pin to bring the blade holder into cutting position, position for which the tooth is received in the housing of the knife body.
  • the means adapted to release the thrust stop of the abutment comprise a first lateral ramp on the blade holder and a second lateral ramp on the pusher.
  • the thrust stop and the second ramp are preferably carried by a flexible arm connected to the pusher.
  • the pusher is operated by means of a rotary handle and a connecting rod.
  • the link is provided with a first axis of rotation on the body of the knife, a second axis offset relative to the axis of rotation of the rod and received in a light of the rotary handle, a arm carrying a third remote axis received in a slide of the pusher, the distance ratio to the first axis of the second axis and the third axis giving a reduction in the longitudinal displacement of the pusher relative to the rotational movement of the handle.
  • the third axis passes through an arcuate groove made in the handle.
  • the knife of the invention advantageously comprises a return spring of the connecting rod clinging to a first pin at the rear of the knife body.
  • it advantageously comprises a return spring of the blade holder clinging to a nipple of the knife body.
  • a knife according to the present invention is shown in figure 1 .
  • It comprises a knife body 1 provided with a receiving housing of 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 and a hatch 1c which allows to change the blade.
  • a pusher 4 driving the blade holder in a longitudinal direction of output of the blade is mounted in the knife body.
  • the pusher element comprises a thrust abutment 5, engaged 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 so that when the blade holder rotates towards the cutting position, the arm bends laterally under the action of the thrust of the ramp 15 on the ramp 16 which releases the stop 5 of the abutment 16 as more particularly represented in figure 4 .
  • the latter comprises a pin 9 shown in FIG. figure 6 .
  • 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 stopper 11 shown in FIG. figure 8 .
  • This stopper disposed at the end of the slide 10 retains the pin which forms an axis of rotation of the blade holder to move it from an advanced position to an inclined cutting position.
  • the pin 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 blade holder has a tooth 13 in the upper front part of the blade holder.
  • the body of the knife comprises a housing 14 for receiving the tooth when the blade holder is in the cutting position as shown in FIG. figure 3 .
  • the tooth 13 is a rear retaining tooth coming to bear against a complementary shoulder in the housing 14 of the body to retain the blade in the inclined cutting position as the knife rests on the material to be cut, for example cardboard .
  • the pusher is operated by means of a rotary handle 8 and a connecting rod 20.
  • the figure 8 represents the operating elements of the blade in their order of connection, namely the blade holder 3, the pusher 4, the rod 20 and the handle 8.
  • the rod 20 is provided with a first axis of rotation 21 represented in figure 9 which is housed in a hole 32 on the body of the knife represented in figure 7 .
  • the rod has a second axis 22 offset from the axis of rotation of the rod and received in a slot 23 of the rotary handle.
  • the connecting rod comprises an arm 24 carrying a third remote axis 25 received in a slideway 26 of the pusher.
  • the distance ratio (first axis 21 - second axis 22) / (first axis 21 - third axis 25) gives a reduction of the longitudinal displacement of the pusher relative to the rotary movement of the handle 8.
  • the handle has an axis of rotation 33 relative to the knife body.
  • the pusher 4 is partially lodged next to the structure of the handle internal to the knife and the third axis 25 passes through an arcuate groove 27 formed in the handle.
  • FIGS 9 and 10 detail the movement of the rod 20 and the pusher 4 and show the extent of movement of the pusher.
  • These return means comprise a return spring 30 of the rod 20 hooking on a first pin 31 identified in FIG. figure 7 at the back of the knife body and clinging to a hook 37 on the connecting rod.
  • They further comprise a spring 28 for returning the blade holder clinging to a second pin 29 of the knife body shown in FIG. figure 7 and on a second hook 36 of the blade holder shown for example in figure 6 .
  • the knife of the invention is a knife comprising a blade holder 3 sliding from the rear to the front of a knife body 1.
  • the blade holder 3 is driven from the rear towards the front by a push device 4 operated by a handle 8 through a connecting rod 20.
  • the slider and the blade holder comprise complementary drive stops 5, 6.
  • the abutment of the pusher 5 is disposed at the end of a vertical flexible arm at the front of the slider.
  • the blade holder comprises a rear arm 12 whose distal end is provided with a transverse axis 9 received in a slideway 10 made in a half-shell of the knife body.
  • the slideway comprises a rubber damper forming a stopper 11 for the blade holder 3.
  • This stop stops the blade holder 3 and catches the games or tolerances of the handle, the rod and the slider.
  • a support on an object to be cut causes a rotation of the blade holder around the transverse axis to bring the blade holder into cutting position, position for which the tooth 13 at the front and upper part of the blade holder is received in a housing 14 of the knife body.
  • the complementary ramps 15, 16 of the blade holder and the slider move the complementary driving abutments away from each other by raising the slider drive stop.
  • the spacing of the drive stops 5, 6 allows, at the end of cutting or if the knife is clear of the workpiece, the blade holder to return to the rear position.
  • the pusher comprises an upper portion 4a and two lateral flanks 4b and 4c, the flank 4c comprising the flexible arm 7, so that the pusher straddles over the blade holder.
  • the pusher On the side opposite to the arm 7, bearing the abutment and the ramp of the pusher, relative to the blade holder, the pusher comprises a vertical arm 35 bearing against a bulge 34 of the blade holder.
  • the arms 7, 35 hold the right blade holder as it advances under the action of the pusher and the arm 35 holds the blade holder vertical when the ramps 15, 16 bend the flexible arm 7 of the opposite side and release the stops.
  • the pusher may possibly advance slightly under the action of the handle and / or the blade holder back slightly under the action of the resilient effect of the stopper.

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 .

EP 1 864 766 A1 décrit un couteau à lame rétractable automatiquement selon le préambule de la revendication 1. EP 1 864 766 A1 discloses a retractable blade knife automatically according to the preamble of claim 1.

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, le poussoir et le porte lame comportant des moyens 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, caractérisé en ce que le porte lame comporte un pion reçu dans une glissière du corps de couteau, le pion étant arrêté en fin de course d'avancée du porte lame par une butée d'arrêt en fin de glissière et formant un axe de rotation du porte lame pour le faire passer d'une position avancée à une position de coupe inclinée.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 an abutment of the blade holder, the pusher and the blade holder having means adapted to releasing the thrust stop of the abutment under the action of a rotation of the blade holder and the blade to an inclined cutting position, characterized in that the blade holder comprises a pin received in a slide of the knife body, the pin being stopped at the end of advancing stroke of the blade holder by a stop at the end of the slide and forming an axis of rotation of the blade holder to move it from an advanced position to an inclined cutting position.

Préférablement, la butée d'arrêt est une butée élastique.Preferably, the stopper is an elastic stop.

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

Selon un mode de réalisation avantageux, le porte lame comporte une dent en partie supérieure avant du porte lame et un logement de réception de la dent dans le corps du couteau.According to an advantageous embodiment, the blade holder comprises a tooth in the upper part of the front of the blade holder and a receiving housing of the tooth in the knife body.

Selon ce mode de réalisation, une fois le porte lame avancé, pion en appui contre la butée d'arrêt, un appui sur un objet à couper provoque une rotation du porte lame autour du pion pour amener le porte lame en position de coupe, position pour laquelle la dent est reçue dans le logement du corps du couteau.According to this embodiment, once the blade holder is advanced, pin resting against the stop, a support on an object to be cut causes a rotation of the blade holder around the pin to bring the blade holder into cutting position, position for which the tooth is received in the housing of the knife body.

Avantageusement, les moyens adaptés pour dégager la butée de poussée de la contre butée comportent une première rampe latérale sur le porte lame et une seconde rampe latérale sur le poussoir.Advantageously, the means adapted to release the thrust stop of the abutment comprise 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 préférablement portées par un bras flexible raccordé au poussoir.The thrust stop and the second ramp are preferably carried by a flexible arm connected to the pusher.

De manière avantageuse, le poussoir se manoeuvre au moyen d'une poignée rotative et d'une bielle.Advantageously, the pusher is operated by means of a rotary handle and a connecting rod.

Selon un mode de réalisation avantageux, la bielle est pourvue d'un premier axe de rotation sur le corps du couteau, un deuxième axe décalé par rapport à l'axe de rotation de la bielle et reçu dans une lumière de la poignée rotative, un bras porteur d'un troisième axe distant reçu dans une glissière du poussoir, le rapport de distance au premier axe du deuxième axe et du troisième axe donnant une démultiplication du déplacement longitudinal du poussoir par rapport au déplacement rotatif de la poignée.According to an advantageous embodiment, the link is provided with a first axis of rotation on the body of the knife, a second axis offset relative to the axis of rotation of the rod and received in a light of the rotary handle, a arm carrying a third remote axis received in a slide of the pusher, the distance ratio to the first axis of the second axis and the third axis giving a reduction in the longitudinal displacement of the pusher relative to the rotational movement of the handle.

Avantageusement, le troisième axe passe au travers d'une rainure en arc de cercle réalisée dans la poignée.Advantageously, the third axis passes through an arcuate groove made in the handle.

Le couteau de l'invention comporte avantageusement un ressort de rappel de la bielle s'accrochant sur un premier téton à l'arrière du corps de couteau.The knife of the invention advantageously comprises a return spring of the connecting rod clinging to a first pin at the rear of the knife body.

De même, il comporte avantageusement un ressort de rappel du porte lame s'accrochant sur un téton du corps de couteau.Similarly, it advantageously comprises a return spring of the blade holder clinging to a nipple of the knife body.

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;
  • en figure 2: une vue de côté du couteau de la figure 1 ouvert lame sortie en position d'attente;
  • en figure 3: une vue de côté du couteau de la figure 1 ouvert lame sortie en position de coupe;
  • en figure 4: une vue en perspective du couteau de la figure 1 ouvert, lame sortie en position de coupe;
  • en figure 5: une vue en perspective des éléments de manoeuvre du couteau selon la figure 4;
  • en figure 6: une vue en perspective d'un porte lame selon un mode de réalisation de l'invention;
  • en figure 7: une vue de côté du porte lame de la figure 6 positionné dans une coque du couteau;
  • en figure 8: une vue de côté d'une coque du couteau;
  • en figure 9: une vue de côté du système de poussée du couteau de la figure 2 en position de repos;
  • en figure 10: une vue de côté du système de poussée de la figure 9 en position d'extension.
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 figure 2 : a side view of the knife of the figure 1 open blade exit in standby position;
  • in figure 3 : a side view of the knife of the figure 1 open blade outlet in cutting position;
  • in figure 4 : a perspective view of the knife of the figure 1 open, blade output in cutting position;
  • in figure 5 : a perspective view of the operating elements of the knife according to the figure 4 ;
  • in figure 6 : a perspective view of a blade holder according to one embodiment of the invention;
  • in figure 7 : a side view of the blade holder of the figure 6 positioned in a hull of the knife;
  • in figure 8 : a side view of a knife shell;
  • in figure 9 : a side view of the knife thrust system of the figure 2 in the rest position;
  • in figure 10 : a side view of the thrust system of the figure 9 in the extended position.

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

Il 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 receiving housing of 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 1 a et une demi coque droite 1 b 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 and a hatch 1c which allows to change the blade.

Comme représenté en figure 2 qui représente le couteau lame sortie en position d'attente de coupe, la lame est solidaire d'un porte lame 3.As represented in figure 2 which represents the blade knife output in the cutting position, the blade is secured to a blade holder 3.

Un poussoir 4 d'entraînement du porte lame dans une direction longitudinale de sortie de la lame est monté dans le corps du couteau.A pusher 4 driving the blade holder in a longitudinal direction of output of the blade is mounted in the knife body.

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.The pusher element comprises a thrust abutment 5, engaged 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 ce qui fait que lorsque le porte lame bascule en rotation vers la position de coupe, le bras fléchit latéralement sous l'action de la poussée de la rampe 15 sur la rampe 16 ce qui dégage la butée 5 de la contre butée 16 comme plus particulièrement représenté en figure 4.The thrust bearing 5 and the second ramp 16 are carried by a flexible arm 7 connected to the pusher so that when the blade holder rotates towards the cutting position, the arm bends laterally under the action of the thrust of the ramp 15 on the ramp 16 which releases the stop 5 of the abutment 16 as more particularly represented in figure 4 .

Selon l'invention et pour mieux maitriser la rotation du porte lame, ce dernier comporte un pion 9 représenté en figure 6.According to the invention and to better control the rotation of the blade holder, the latter comprises a pin 9 shown in FIG. figure 6 .

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 à la figure 8.The pin is stopped at the end of advancing stroke of the blade holder by a stopper 11 shown in FIG. figure 8 .

Cette butée d'arrêt disposée en fin de glissière 10 retient le pion 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 retains the pin which forms an axis of rotation of the blade holder to move it from an advanced position to an inclined cutting position.

Le pion 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 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.

De retour à la figure 2, le porte lame comporte une dent 13 en partie supérieure avant du porte lame.Back to the figure 2 , the blade holder has a tooth 13 in the upper front part of the blade holder.

Le corps du couteau comporte un logement 14 de réception de la dent lorsque le porte lame est en position de coupe comme représenté en figure 3.The body of the knife comprises a housing 14 for receiving the tooth when the blade holder is in the cutting position as shown in FIG. figure 3 .

La dent 13 est une dent de retenue arrière venant s'appuyer contre un épaulement complémentaire dans le logement 14 du corps pour retenir la lame dans la position de coupe inclinée tant que le couteau est en appui sur le matériau à couper, par exemple du carton.The tooth 13 is a rear retaining tooth coming to bear against a complementary shoulder in the housing 14 of the body to retain the blade in the inclined cutting position as the knife rests on the material to be cut, for example cardboard .

Lorsque l'on veut couper un objet, on presse sur la poignée ce qui fait avancer la lame et, une fois le porte lame avancé, pion 9 en appui contre la butée d'arrêt 11, un appui sur un objet à couper provoque une rotation du porte lame autour du pion pour amener le porte lame en position de coupe C, position pour laquelle la dent 13 est reçue dans le logement 14 du corps du couteau.When one wants to cut an object, one presses on the handle which makes advance the blade and, once the blade holder advanced, pin 9 bearing against the abutment stop 11, a support on an object to cut causes a rotating the blade holder around the pin to bring the blade holder into cutting position C, the position for which the tooth 13 is received in the housing 14 of the knife body.

Selon l'exemple, le poussoir se manoeuvre au moyen d'une poignée rotative 8 et d'une bielle 20.According to the example, the pusher is operated by means of a rotary handle 8 and a connecting rod 20.

La figure 8 représente les éléments de manoeuvre de la lame dans leur ordre de connexion à savoir le porte lame 3, le poussoir 4, la bielle 20 et la poignée 8.The figure 8 represents the operating elements of the blade in their order of connection, namely the blade holder 3, the pusher 4, the rod 20 and the handle 8.

La bielle 20 est pourvue d'un premier axe de rotation 21 représenté en figure 9 qui vient se loger dans un trou 32 sur le corps du couteau représenté en figure 7.The rod 20 is provided with a first axis of rotation 21 represented in figure 9 which is housed in a hole 32 on the body of the knife represented in figure 7 .

De retour à la figure 5, la bielle comporte un deuxième axe 22 décalé par rapport à l'axe de rotation de la bielle et reçu dans une lumière 23 de la poignée rotative.Back to the figure 5 , the rod has a second axis 22 offset from the axis of rotation of the rod and received in a slot 23 of the rotary handle.

La bielle comprend un bras 24 porteur d'un troisième axe 25 distant reçu dans une glissière 26 du poussoir.The connecting rod comprises an arm 24 carrying a third remote axis 25 received in a slideway 26 of the pusher.

Pour permettre à la poignée d'actionner le porte lame avec une course courte, le rapport de distance (premier axe 21 - deuxième axe 22)/(premier axe 21 - troisième axe 25) donne une démultiplication du déplacement longitudinal du poussoir par rapport au déplacement rotatif de la poignée 8.To allow the handle to actuate the blade holder with a short stroke, the distance ratio (first axis 21 - second axis 22) / (first axis 21 - third axis 25) gives a reduction of the longitudinal displacement of the pusher relative to the rotary movement of the handle 8.

La poignée comporte un axe de rotation 33 par rapport au corps du couteau.The handle has an axis of rotation 33 relative to the knife body.

Lorsque l'on appuie sur la poignée, les parois de la lumière 23 poussent sur le deuxième axe 22 ce qui fait tourner la bielle autour du premier axe 21, le troisième axe 25 poussant alors le poussoir vers l'avant.When pressing the handle, the walls of the light 23 push on the second axis 22 which rotates the rod about the first axis 21, the third axis 25 then pushing the pusher forward.

Pour rendre le couteau compact, le poussoir 4 se loge en partie à côté de la structure de la poignée interne au couteau et le troisième axe 25 passe au travers d'une rainure en arc de cercle 27 réalisée dans la poignée.To make the knife compact, the pusher 4 is partially lodged next to the structure of the handle internal to the knife and the third axis 25 passes through an arcuate groove 27 formed in the handle.

Les figures 9 et 10 détaillent le mouvement de la bielle 20 et du poussoir 4 et permettent de constater l'étendue du mouvement du poussoir.The Figures 9 and 10 detail the movement of the rod 20 and the pusher 4 and show the extent of movement of the pusher.

Toujours sur les figures 9 et 10 sont représentés les moyens de rappel du porte lame et du poussoir.Always on Figures 9 and 10 are represented the return means of the blade holder and the pusher.

Ces moyens de rappel comportent un ressort 30 de rappel de la bielle 20 s'accrochant sur un premier téton 31 repéré en figure 7 à l'arrière du corps de couteau et s'accrochant sur un crochet 37 sur la bielle.These return means comprise a return spring 30 of the rod 20 hooking on a first pin 31 identified in FIG. figure 7 at the back of the knife body and clinging to a hook 37 on the connecting rod.

Ils comportent en outre un ressort 28 de rappel du porte lame s'accrochant sur un second téton 29 du corps de couteau représenté en figure 7 et sur un second crochet 36 du porte lame représenté par exemple en figure 6.They further comprise a spring 28 for returning the blade holder clinging to a second pin 29 of the knife body shown in FIG. figure 7 and on a second hook 36 of the blade holder shown for example in figure 6 .

Le couteau de l'invention est un couteau comportant un porte lame 3 coulissant de l'arrière vers l'avant d'un corps 1 de couteau.The knife of the invention is a knife comprising a blade holder 3 sliding from the rear to the front of a knife body 1.

Le porte lame 3 est entraîné de l'arrière vers l'avant par un dispositif poussoir 4 manoeuvré par une poignée 8 au travers d'une bielle 20.The blade holder 3 is driven from the rear towards the front by a push device 4 operated by a handle 8 through a connecting rod 20.

Pour permettre l'entraînement du porte lame par le curseur, le curseur et le porte lame comportent des butées d'entraînement complémentaires 5, 6.To allow the blade holder to be driven by the slider, the slider and the blade holder comprise complementary drive stops 5, 6.

La butée du poussoir 5 est disposée à l'extrémité d'un bras flexible vertical à l'avant du curseur.The abutment of the pusher 5 is disposed at the end of a vertical flexible arm at the front of the slider.

Le porte lame comporte un bras arrière 12 dont l'extrémité distale est muni d'un axe transversal 9 reçu dans une glissière 10 réalisée dans une demi coque du corps de couteau.The blade holder comprises a rear arm 12 whose distal end is provided with a transverse axis 9 received in a slideway 10 made in a half-shell of the knife body.

Dans le sens de sortie de la lame, la glissière comporte un amortisseur caoutchouc formant une butée d'arrêt 11 pour le porte lame 3.In the direction of exit of the blade, the slideway comprises a rubber damper forming a stopper 11 for the blade holder 3.

Cette butée d'arrêt stoppe le porte lame 3 et rattrape les jeux ou tolérances de la poignée, de la biellette et du curseur.This stop stops the blade holder 3 and catches the games or tolerances of the handle, the rod and the slider.

Une fois le porte lame avancé en appui contre la butée d'arrêt 11, un appui sur un objet à couper provoque une rotation du porte lame autour de l'axe transversal pour amener le porte lame en position de coupe, position pour laquelle la dent 13 à l'avant et en partie supérieure du porte lame est reçue dans un logement 14 du corps du couteau.Once the blade holder advanced bearing against the stopper 11, a support on an object to be cut causes a rotation of the blade holder around the transverse axis to bring the blade holder into cutting position, position for which the tooth 13 at the front and upper part of the blade holder is received in a housing 14 of the knife body.

Pendant la rotation du porte lame, les rampes complémentaires 15, 16 du porte lame et du curseur écartent les butées d'entraînement complémentaires l'une de l'autre en soulevant la butée d'entraînement du curseur.During the rotation of the blade holder, the complementary ramps 15, 16 of the blade holder and the slider move the complementary driving abutments away from each other by raising the slider drive stop.

L'écartement des butées d'entraînement 5, 6 permet, lors de la fin de coupe ou si le couteau est dégagé de la pièce à couper, au porte lame de revenir en position arrière.The spacing of the drive stops 5, 6 allows, at the end of cutting or if the knife is clear of the workpiece, the blade holder to return to the rear position.

En final, lorsque la lame est en position de coupe, dent 13 en appui dans son logement, le porte lame a globalement reculé par rapport à la direction longitudinale du couteau.Finally, when the blade is in the cutting position, tooth 13 resting in its housing, the blade holder has generally retracted relative to the longitudinal direction of the knife.

En figure 5 où sont représentés le porte lame 3 et le poussoir 4 on remarque que le poussoir comporte une partie supérieure 4a et deux flancs latéraux 4b et 4c, le flanc 4c comprenant le bras flexible 7, de sorte que le poussoir se trouve à cheval au dessus du porte lame.In figure 5 where are represented the blade holder 3 and the pusher 4 it is noted that the pusher comprises an upper portion 4a and two lateral flanks 4b and 4c, the flank 4c comprising the flexible arm 7, so that the pusher straddles over the blade holder.

Aux figures 9 et 10 le poussoir est vu du côté du flanc 4b opposé au bras flexible 7.To the Figures 9 and 10 the pusher is seen from the side of the flank 4b opposite the flexible arm 7.

Du côté opposé au bras 7, portant la butée et la rampe du poussoir, par rapport au porte lame, le poussoir comprend un bras vertical 35 venant en appui contre un renflement 34 du porte lame.On the side opposite to the arm 7, bearing the abutment and the ramp of the pusher, relative to the blade holder, the pusher comprises a vertical arm 35 bearing against a bulge 34 of the blade holder.

Ainsi, les bras 7, 35 maintiennent le porte lame droit pendant qu'il avance sous l'action du poussoir et le bras 35 maintient le porte lame vertical lorsque les rampes 15, 16 font fléchir le bras flexible 7 du côté opposé et dégagent les butées.Thus, the arms 7, 35 hold the right blade holder as it advances under the action of the pusher and the arm 35 holds the blade holder vertical when the ramps 15, 16 bend the flexible arm 7 of the opposite side and release the stops.

Ceci permet par rapport au document EP 1 273 399 A1 de maintenir le porte lame droit tout en utilisant un dispositif de butées d'un seul côté du porte lame, le principe de dégagement de butées par rampe agissant latéralement par rapport à l'axe de déplacement du poussoir restant le même.This allows in relation to the document EP 1 273 399 A1 to maintain the right blade holder while using a stop device on one side of the blade holder, the ramp release principle acting laterally with respect to the axis of movement of the pusher remaining the same.

Il est à noter que le poussoir n'est pas arrêté et que le porte lame par contre a son mouvement limité par la butée d'arrêt 11.It should be noted that the pusher is not stopped and that the blade holder on the other hand has its movement limited by the stopper 11.

Lorsque le porte lame est mis en rotation, et que la butée 5 se dégage de la butée 6 comme représenté par exemple aux figures 3 ou 4, le poussoir peut éventuellement avancer légèrement sous l'action de la poignée et/ou le porte lame reculer légèrement sous l'action de l'effet élastique de la butée d'arrêt.When the blade holder is rotated, and the abutment 5 is disengaged from the abutment 6 as represented for example by figures 3 or 4 , the pusher may possibly advance slightly under the action of the handle and / or the blade holder back slightly under the action of the resilient effect of the stopper.

Ceci évite toute remise en prise des butées 5, 6 en position de coupe ou en fin de coupe.This avoids any engagement of the stops 5, 6 in the cutting position or at the end of cutting.

Claims (11)

  1. Knife with an automatically retractable blade comprising a knife body (1) provided with a housing for receiving a blade (2) secured to a blade holder (3) and provided with a pusher (4) for driving the blade holder in a longitudinal direction for bringing out the blade, for which the pusher comprises a thrust stop (5), engaged in a longitudinal direction for bringing out the blade with a counter-stop (6) of the blade holder, the pusher and the blade holder comprising means (15, 16) suitable for disengaging the thrust stop of the counter-stop under the action of a rotation of the blade holder and of the blade to an inclined cutting position, the blade holder comprising a pin (9) received in a rail (10) of the knife body, the pin being stopped at the end of forward travel of the blade holder by a stop abutment (11) at the end of the rail (10) and forming a rotation axis of the blade holder in order to make it move from a forward position to an inclined cutting position, characterized in that the pin is placed at the end of an arm (12) extending the blade holder (3) rearwards so as to enlarge the radius of rotation of the blade holder.
  2. Knife according to Claim 1, characterized in that the stop abutment (11) is an elastic abutment.
  3. Knife according to Claim 1 or 2, characterized in that it comprises a tooth (13) in the top front portion of the blade holder and a housing (14) for receiving the tooth in the knife body.
  4. Knife according to Claim 3, characterized in that, once the blade holder is moved forward, pin resting against the stop abutment, a pressure on an object to be cut causes a rotation of the blade holder around the pin in order to bring the blade holder into the cutting position (C), a position for which the tooth (13) is received in the housing (14) of the knife body.
  5. Knife according to any one of the preceding claims, characterized in that the means adapted to disengage the thrust stop of the counter-stop comprise a first lateral ramp (15) on the blade holder and a second lateral ramp (16) on the button.
  6. Knife according to Claim 5, characterized in that the thrust stop (5) and the second ramp (16) are supported by a flexible arm (7) connected to the pusher.
  7. Knife according to any one of the preceding claims, characterized in that the pusher is operated by means of a rotary handle (8) and a connecting rod (20).
  8. Knife according to Claim 7, characterized in that the connecting rod (20) is provided with a first rotation spindle (21) on the body of the knife, a second spindle (22) offset relative to the rotation spindle of the connecting rod and received in an opening (23) of the rotary handle, an arm (24) supporting a third distant spindle (25) received in a rail (26) of the button, the ratio of distance to the first spindle (21) from the second spindle (22) and from the third spindle (25) giving a gear reduction of the longitudinal movement of the button relative to the rotary movement of the handle (8).
  9. Knife according to Claim 8, characterized in that the third spindle (25) passes through a circularly arcuate groove (27) made in the handle.
  10. Knife according to any one of Claims 7 to 9, characterized in that it comprises a return spring (30) for the connecting rod (20) coupled to a first stub element (31) at the rear of the knife body.
  11. Knife according to any one of the preceding claims, characterized in that it comprises a return spring (28) for the blade holder, coupled to a stub element (29) of the knife body.
EP20110154462 2010-02-15 2011-02-15 Safety knife Not-in-force EP2359990B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1051028A FR2956341B1 (en) 2010-02-15 2010-02-15 SAFETY KNIFE

Publications (2)

Publication Number Publication Date
EP2359990A1 EP2359990A1 (en) 2011-08-24
EP2359990B1 true EP2359990B1 (en) 2013-05-29

Family

ID=42735808

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20110154462 Not-in-force EP2359990B1 (en) 2010-02-15 2011-02-15 Safety knife

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EP (1) EP2359990B1 (en)
FR (1) FR2956341B1 (en)

Families Citing this family (1)

* 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

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5303474A (en) * 1992-11-30 1994-04-19 Psi, Inc. Safety utility knife
FR2826898B1 (en) 2001-07-06 2003-09-19 Gerard Tremblay RETRACTABLE BLADE CUTTING DEVICE
JP4851242B2 (en) * 2006-06-06 2012-01-11 オルファ株式会社 Safety cutter knife
FR2911532B1 (en) * 2007-01-19 2009-12-11 Mure & Peyrot AUTOMATICALLY RETRACTABLE BLADE KNIFE
FR2912945B1 (en) * 2007-02-27 2009-11-27 Mure & Peyrot SAFETY KNIFE
FR2915416B1 (en) * 2007-04-27 2010-01-22 Mure & Peyrot SAFETY KNIFE WITH AUTOMATIC BLADE RETRACTION DEVICE AT THE END OF THE CUT
DE202008004001U1 (en) * 2008-03-25 2008-08-14 Min, Zheng Zeng, Situn Carpet knife with a pressure mechanism for blade extension

Also Published As

Publication number Publication date
EP2359990A1 (en) 2011-08-24
FR2956341A1 (en) 2011-08-19
FR2956341B1 (en) 2012-11-02

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