EP1985417B1 - Sicherheitsmesser mit automatischem Rückzugsmechanismus der Schneide nach Beenden des Schneidevorgangs - Google Patents

Sicherheitsmesser mit automatischem Rückzugsmechanismus der Schneide nach Beenden des Schneidevorgangs Download PDF

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Publication number
EP1985417B1
EP1985417B1 EP20080103537 EP08103537A EP1985417B1 EP 1985417 B1 EP1985417 B1 EP 1985417B1 EP 20080103537 EP20080103537 EP 20080103537 EP 08103537 A EP08103537 A EP 08103537A EP 1985417 B1 EP1985417 B1 EP 1985417B1
Authority
EP
European Patent Office
Prior art keywords
pusher
blade holder
blade
knife
safety knife
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP20080103537
Other languages
English (en)
French (fr)
Other versions
EP1985417A1 (de
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
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mure et Peyrot SAS filed Critical Mure et Peyrot SAS
Publication of EP1985417A1 publication Critical patent/EP1985417A1/de
Application granted granted Critical
Publication of EP1985417B1 publication Critical patent/EP1985417B1/de
Expired - Fee Related 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 with automatic blade retraction device at the end of cutting.
  • the document DE 43 15 495 A1 provides in particular a device for which the blade holder comprises a cam path receiving a pin carried by the knife body when the blade holder is pushed by a pusher and for which a tilting of the blade holder under a cutting force positions the pin against a temporary stop integral with the cam path so that when the force is canceled, the nipple escapes the temporary stop and the blade holder retracts inside the knife body under the action of a return spring.
  • This device is however difficult to implement because uses means for driving the blade holder by the pusher allowing a release of the blade holder at the end of thrust made by a system of drive stops for exceeding the pusher beyond the blade blade drive abutment when hooking the blade holder on the stud which causes a jolt during the transition of the blade holder from the position where it is pushed by the pusher to the position where the blade holder n is more guided by the pusher.
  • the dimensioning of the drive stops of the cam path and the position of the stud are difficult to control in order to obtain an operation every time without inadvertent retraction of the blade or blocking of the pusher and the blade holder.
  • the object of the present invention is to provide a safety knife with an automatic blade retraction device at the end of cutting, comprising an arming of the retraction device by prior rotation of the blade holder under the cutting force, offering good positioning accuracy. blade door being cut while avoiding the risk of inadvertent retraction of the blade holder during cutting.
  • the present invention relates to a safety knife with an automatic blade retraction device at the end of cutting, comprising a blade holder and an operating pusher of the blade holder sliding longitudinally in the body of the knife to bring out the blade carried by the blade.
  • blade holder of the knife body for which the blade holder and the operating pusher are connected by a first spring member applying a first driving abutment, part of the pusher, against a second driving abutment of the blade holder, said first and second stops being adapted to disengage by rotation of the blade holder relative to the pusher under a cutting force (E).
  • the figures 1 and 2 represent an example of a safety knife 1 with automatic blade retraction device at the end of cutting according to the invention seen in exploded respectively the right side and the left side.
  • the knife comprises a body composed of two half-shells 11a and 11b, a blade 26 carried by a blade holder 2.
  • the left half-shell is truncated to make it possible to make a removable hatch 25 to allow a blade change 26.
  • the blade holder 2 receiving the blade 26 is mounted on a pusher 3 for actuating the blade holder.
  • the pusher 3 slides longitudinally in the knife body to bring out the blade 26 carried by the blade holder 2 of the knife body.
  • the blade holder and the operating pusher are connected by a first spring element 4 applying a first driving abutment 5, part of the pusher, against a second abutment 6 for driving the blade holder and the first and second stops 5, 6 are adapted to disengage by rotation of the blade holder relative to the pusher under a cutting force E.
  • the blade holder is applied to one side of the pusher and the second driving abutment 6 is received in a window 7 of the pusher making a cam path defining an advanced position and a retracted position of the blade holder relative to the pusher.
  • the blade holder is guided longitudinally between the left half-shell 11b and the pusher 3 to remain parallel to the pusher.
  • the spring 4 is a coil spring provided with hooking rings at each of its ends, a first ring clinging to a pin 14 protruding from the face of the blade holder resting on the pusher and a second ring clinging to a pin 15 carried by the pusher, the spring being tensioned when the first and second stops 5, 6 are engaged to be able to return the blade holder back when the stops are released.
  • the pin 14 of the blade holder is disposed in a window 7 cut in the pusher and realizing the cam path receiving the second drive stop.
  • the first drive stop 5 consists of a stop of a ramp 8 made in the cam path of the window 7.
  • the figure 1 in particular represents the blade holder with its abutment 6 engaged with the abutment 5 of the pusher.
  • the blade holder 2 comprises a finger 9 adapted to bear against a shoulder 10 of the knife body 11a, 11b and to hold the blade holder 2 in a cutting position inclined with respect to operating pusher 3.
  • the pusher moves back into the body so that the stop 6 for driving the blade holder goes up on the ramp 8 and is engaged against the drive stopper 5 of the pusher.
  • the pusher is pushed forward by an operating means such as a button coming out of the knife body or the operating means described below in the form of a rotary trigger 16 and the pusher and the blade holder take the position represented in Figure 4A to take out the blade 26.
  • an operating means such as a button coming out of the knife body or the operating means described below in the form of a rotary trigger 16 and the pusher and the blade holder take the position represented in Figure 4A to take out the blade 26.
  • the spring 4 tilts the blade holder, which disengages the finger 9 from the shoulder 10 and brings the blade holder to the position shown in FIG. figure 4C retracted into the knife body.
  • the blade holder To stop the retraction of the blade door disengaged from the pusher, the blade holder has a first rear stopper 20 cooperating with a second rear stopper 21a, 21b carried by the knife body.
  • the pusher is thus adapted to move back into the body under the action of the first spring element in a reengagement position of the drive abutments 5, 6 of the blade holder and the pusher.
  • the blade holder 2 comprises a pin 12 sliding in a longitudinal groove 13 of the pusher and forming an axis of rotation of the blade holder relative to the pusher.
  • the second rear stopper 21b may be the front of a pusher trigger and the first rear stop 20 a rear shoulder of the blade holder.
  • the second rear stopper is a pad 21a of a half-shell as shown in FIG. figure 4C .
  • the blade holder and its various members cooperating with the pusher is particularly detailed in figure 3 where are represented the driving abutment 6, the pin 14 of attachment of the spring element 4 and the pin 12 sliding in the groove 13 of the pusher and forming axis of rotation of the blade holder relative to the pusher.
  • the spring element 4 clings to the pins 14 of the blade holder 2 and the pin 15 of the pusher 3 in a direction slightly inclined relative to the groove 13 of the pusher, the pin 15 on the pusher being further away the axis of the groove 13 that the pin 15 so that the spring element applies to the blade holder a torque resistant to the rotation of the blade holder in the direction of disengagement of the first and second stops 5, 6 and brings back the stop drive 6 of the blade holder against the ramp 8 during the retraction of the pusher to re-engage the drive stops.
  • first spring element 4 is positioned relative to the pin 12 and the finger 9 so as to apply to the blade holder a torque around the pin 12 tending, blade holder positioned in the inclined cutting position, to release the finger 9 of the shoulder 10.
  • the pin 14 of attachment of the spring element is disposed in front and below the pin 12 forming the axis of rotation of the blade holder 2 while the finger 9 is located in front of the pin 14 and above the pin 12 .
  • the invention also applies to a safety knife as represented here by way of example for which the pusher is made in the form of a sliding drawer operated by an operating member protruding outside the body 11a, 11 b of the knife.
  • the operating member 16 is formed as a rotary trigger returned to the rest position, that is to say in the position for which the blade holder and the pusher are retracted into the body of the knife, by a second element spring 22 whose one end is fixed on a pin 23 of the trigger and the other end is fixed on a pin 24 made on one of the half-shells of the knife.
  • the rotary trigger 16 comprises an axis of rotation 27 received in bores 28 made in the half-shells. It comprises a bearing surface 29, for the palm of the operator, which protrudes half-shells 11a, 11b by a slot made in the latter.
  • lever 17 having a thrust end provided with a second axis 17a engaging in a slide 18 of the pusher, as shown in FIG. Figure 4B especially where the trigger has been removed to better represent the connection of the lever 17 with the pusher 3, and a drive end provided with a third axis 17b received in a slot 19 of the trigger as shown in FIG. figures 2 and 4A especially.
  • the lever which has an axis of rotation 17C in the form of a bore, more particularly visible in figure 1 , receiving a 17D axis made in one of the half-shells of the knife body and visible in figure 2 , converts the rotational movement of the trigger into a translational movement of the pusher and amplifies the relatively limited rotational stroke of the trigger to obtain a large translational stroke of the pusher.
  • the slide 18 of the pusher and the oblong slot 19 of the trigger allow a compact assembly for which the pusher and the trigger are side by side.
  • the knife according to the example shown in Figure 4A further comprises means for locking the trigger in the form of a latch 30 and interfering with a tooth 32 of the trigger, the latch being removed from the interference position with the tooth 32 under the action of a push button 31 connected to the lock by a spring link 33 pivoting the lock when pressing the push button 31.
  • the knife body 11a comprises a travel limiter of the blade holder formed according to the example by a return 34 of a rim 35 of the knife body.
  • This stroke limiter 34 arranged on a side opposite to the side of the blade holder carrying the finger 9, stops the blade holder and prevents it being pulled outwards during cutting.
  • the invention is not limited to the example shown and is particularly applicable to a safety knife for which the actuating member may be an actuating button secured to the pusher protruding from the knife body through a slot made in at least one of the half-shells 11a, 11b.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)

Claims (10)

  1. Sicherheitsmesser (1) mit Vorrichtung zum automatischen Klingenzurückziehen am Ende des Schneidens mit einem Klingenträger (2) und einem Schieber (3) zum Betätigen des Klingenträgers, der in Längsrichtung im Messerkörper gleitet, um die vom Klingenträger getragene Klinge aus dem Messerkörper herauszufahren, dadurch gekennzeichnet, dass der Klingenträger und der Betätigungsschieber über ein erstes Federelement (4) verbunden sind, das einen ersten Antriebsanschlag (5), der Teil des Schiebers ist, gegen einen zweiten Antriebsanschlag (6) des Klingenträgers aufbringt, wobei der erste und der zweite Anschlag (5, 6) geeignet sind, durch Drehung des Klingenträgers bezüglich des Schiebers unter einer Schneidkraft (E) auszurücken, und dass der Klingenträger (2) einen Finger (9) umfasst, der geeignet ist, an einer Schulter (10) des Messerkörpers (11a, 11b) anzuliegen und den Klingenträger (2) in einer bezüglich des Betätigungsschiebers (3) geneigten Schneidposition zu halten.
  2. Sicherheitsmesser nach Anspruch 1, wobei der zweite Antriebsanschlag (6) in einem Fenster (7) des Schiebers aufgenommen ist, wodurch eine Nockenbahn entsteht, die eine vorgeschobene Position und eine zurückgefahrene Position des Klingenträgers bezüglich des Schiebers definiert, wobei der erste Antriebsanschlag (5) aus einer Sperre einer Rampe (8) besteht, die in der Nockenbahn (7) ausgeführt ist.
  3. Sicherheitsmesser nach Anspruch 1 oder 2, wobei der Klingenträger (2) einen Zapfen (12) umfasst, der in einer Längsnut (13) des Schiebers gleitet und eine Rotationsachse des Klingenträgers bezüglich des Schiebers bildet.
  4. Sicherheitsmesser nach Anspruch 3, wobei das erste Federelement (4) in einer solchen Richtung am Schieber (3) und am Klingenträger (2) angebracht ist (14, 15), dass in einer dem Ausrücken des ersten und zweiten Anschlags (5, 6) entgegengesetzten Richtung ein Moment auf den Klingenträger aufgebracht wird.
  5. Sicherheitsmesser nach Anspruch 4, wobei das erste Federelement (4) so bezüglich des Zapfens (12) und des Fingers (9) positioniert ist, dass auf den Klingenträger ein Drehmoment um den Zapfen (12) aufgebracht wird, das dazu neigt, den Finger (9) aus der Schulter (10) auszurücken, wenn der Klingenträger in der geneigten Schneidposition positioniert ist.
  6. Sicherheitsmesser nach einem der vorhergehenden Ansprüche, wobei der Schieber in der Form einer gleitenden Schublade ausgeführt ist, die von einem Betätigungselement (16) betätigt wird, das vom Äußeren des Körpers (11a, 11b) des Messers übersteht.
  7. Sicherheitsmesser nach Anspruch 6, wobei das Betätigungselement (16) in der Form eines Drehabzugs ausgeführt ist, der durch ein zweites Federelement (22) in die Ruheposition zurückgeholt wird.
  8. Sicherheitsmesser nach Anspruch 7, wobei der Drehabzug mit dem Schieber über einen Hebel (17) verbunden ist, der ein Schubende, das mit einem zweiten Bolzen (17a) versehen ist, der in eine Schiene (18) des Schiebers eingreift, und ein Antriebsende umfasst, das mit einem dritten Bolzen (17b) versehen ist, der in einem Schlitz (19) des Abzugs aufgenommen ist.
  9. Sicherheitsmesser nach einem der vorhergehenden Ansprüche, wobei der Klingenträger einen ersten hinteren Sperranschlag (20) umfasst, der mit einem zweiten hinteren Sperranschlag (21a, 21b) zusammenwirkt, der vom Messerkörper getragen wird, um das Zurückziehen des aus dem Schieber ausgerückten Klingenträgers zu stoppen, wobei der Schieber geeignet ist, sich unter der Wirkung des ersten Federelements in eine Position des Wiedereingriffs der Antriebsanschläge (5, 6) des Klingenträgers und des Schiebers in den Körper zurückzuziehen.
  10. Sicherheitsmesser nach einem der vorhergehenden Ansprüche, wobei der Messerkörper (11a) einen Hubbegrenzer des Klingenträgers umfasst.
EP20080103537 2007-04-27 2008-04-15 Sicherheitsmesser mit automatischem Rückzugsmechanismus der Schneide nach Beenden des Schneidevorgangs Expired - Fee Related EP1985417B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0754743A FR2915416B1 (fr) 2007-04-27 2007-04-27 Couteau de securite a dispositif de retraction automatique de lame en fin de coupe

Publications (2)

Publication Number Publication Date
EP1985417A1 EP1985417A1 (de) 2008-10-29
EP1985417B1 true EP1985417B1 (de) 2011-08-17

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EP20080103537 Expired - Fee Related EP1985417B1 (de) 2007-04-27 2008-04-15 Sicherheitsmesser mit automatischem Rückzugsmechanismus der Schneide nach Beenden des Schneidevorgangs

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EP (1) EP1985417B1 (de)
FR (1) FR2915416B1 (de)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102008019441A1 (de) * 2008-04-17 2009-10-22 Martor Kg Messer
DE102009050380A1 (de) * 2009-10-22 2011-04-28 Martor Kg Messer
FR2956341B1 (fr) * 2010-02-15 2012-11-02 Mure Et Peyrot Couteau de securite
FR2960174B1 (fr) * 2010-05-21 2012-09-28 Mure Et Peyrot Couteau de securite
EP2455199A1 (de) * 2010-11-17 2012-05-23 Olfa Corporation Kuttermesser
FR3001908B1 (fr) 2013-02-14 2015-04-17 Mure Et Peyrot Dispositif porte lame a mecanisme de rentree de lame automatique en fin de coupe et couteau de securite le comprenant
US10814505B2 (en) * 2014-05-06 2020-10-27 Martor Kg Knife with automatic blade retraction
FR3024385B1 (fr) 2014-07-31 2017-02-24 Mure Et Peyrot Couteau a sortie de lame commandee par poussoir d'actionnement et pignons
TWI574804B (zh) * 2015-07-20 2017-03-21 Combination of knives

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4315495A1 (de) * 1993-05-10 1994-11-17 Dennis Lohrengel Sicherheitsmesser
FR2826898B1 (fr) * 2001-07-06 2003-09-19 Gerard Tremblay Dispositif de coupe a lame retractable
DE102004063046B3 (de) * 2004-12-22 2006-03-09 Martor Kg Messer

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Publication number Publication date
FR2915416A1 (fr) 2008-10-31
EP1985417A1 (de) 2008-10-29
FR2915416B1 (fr) 2010-01-22

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