EP0729811B1 - Card board box knife - Google Patents

Card board box knife Download PDF

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Publication number
EP0729811B1
EP0729811B1 EP95119265A EP95119265A EP0729811B1 EP 0729811 B1 EP0729811 B1 EP 0729811B1 EP 95119265 A EP95119265 A EP 95119265A EP 95119265 A EP95119265 A EP 95119265A EP 0729811 B1 EP0729811 B1 EP 0729811B1
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EP
European Patent Office
Prior art keywords
knife
crank
blade carrier
pin
articulating
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 - Lifetime
Application number
EP95119265A
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German (de)
French (fr)
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EP0729811A1 (en
Inventor
Harald Prof. Dipl.-Ing. Berns
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.)
Martor Argentax EH Beermann KG
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Martor Argentax EH Beermann KG
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Publication of EP0729811A1 publication Critical patent/EP0729811A1/en
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B1/00—Hand knives with adjustable blade; Pocket knives
    • B26B1/08—Hand knives with adjustable blade; Pocket knives with sliding blade

Definitions

  • the invention relates to a knife, in particular Cardboard knife, with one in a handle housing the force of a tension spring slidably guided Knife blade holder with knife blade and with one from an underside longitudinal slot of the handle housing outstanding extension, the one with the knife blade holder is connected and in the event of friction intervention with the material to be cut opposite to Cutting direction from the knife blade holder Handle housing moved out.
  • a non-generic knife according to the DE-GM 1 885 827 is at both ends with one of each a blade covered with a covering element, the covering elements under the action of a double-sided Taper spring always pressed into its covering position become.
  • the knife is used for cutting if possible vertically with the cover to cutting surface, against the effect the conical spring is pressed open until the tip of the blade engages with the material to be cut.
  • Apart from this knife is in terms of its technical complexity in need of improvement than the engagement of the blade tip into the material to be cut due to the covering element cannot be perceived exactly, but from the Operator must be estimated. This is obvious even the inventor of this knife recognized and for this reason a latch lock for snapping into place of the cover member with the knife blade exposed appropriate. But then the protective effect of the Cover member.
  • Knives of another genre have become known Handle housing designed like a pistol grip and its knife blade holder by means of a arranged at the rear end of the handle housing Push button with thumb pressure against the effect a return spring from the free end of the pistol grip-like Handle housing must be pushed out.
  • this is ergonomically unfavorable because the Power of the thumb both for pushing out the knife blade holder against the force of the return spring as well as for cutting.
  • On the other hand can cause injuries when lifting the knife blade from the Cuttings are not prevented as long as that Force the thumb to extend the knife blade Holds position.
  • the invention has for its object a knife to create the type mentioned above, which itself through a simple but effective arrangement the transmission of motion of the outstanding Extension when there is friction with the material to be cut on the knife blade holder.
  • the coupling between the knife blade carrier and the crank is connected by an elongated hole in the crank with the hinge pin of the knife blade holder educated. This creates a particularly flat shape achieved a relatively flat handle housing.
  • the paddock between knife blade holder and crank by one crank slide with articulated pin arranged on the crank formed in a joint recess in Knife blade holder engages.
  • the crank can be made from one embodiment Rod material and the crank slide from one Pipe material in a technically simple manner getting produced.
  • the knife blade holder can optionally be used with one protruding over its side surface Articulated pin or with a joint recess be provided, in turn, a hinge pin of the Crank slide engages.
  • the crank on their free, facing away from the pivot axis Provide the end with the extension.
  • the length of this Extension is designed so that when complete Immerse this extension in the underside Longitudinal slot of the handle housing itself Knife blade holder with the knife blade in his end position pushed out of the handle housing located.
  • Lever arm length between the tip of the protruding Extension and the pivot axis of the crank result different construction variants with minimal Swiveling forces of the crank to push out the knife blade holder.
  • the knife blade holder is advantageous as flatter, form-fitting within the handle housing guided slide formed on his one Side a pin for receiving the knife blade and has the hinge pin on its other side.
  • a pin for receiving the knife blade and has the hinge pin on its other side Basically, are flat, within the Handle housing form-fitting slide as Knife blade holder known for generic knives, e.g. from U.S. Patent 3,999,290.
  • the pivot axis for the crank is on arranged on the inside of the handle housing, the side of the knife blade holder with the hinge pin or facing the joint recess.
  • the knife blade holder is advantageous on his rear end with a fastening pin for articulation the tension spring provided with its other End in a manner known per se on a housing pin is articulated in the handle housing.
  • the invention is the free end of the disc-shaped
  • the crank is triangular in its side view and extends when the knife blade holder is retracted like the slot in one to the cutting direction vertical plane, in which also the Pivot axis of the crank is.
  • the tip of the free end of the crank lies in one top dead center from which the crank over a relatively large swivel angle and thus the knife blade holder over a relatively large one Slide out of the handle housing can be until the free end of the crank in its underside longitudinal slot disappears. This will the handling of the knife is correspondingly easier.
  • the crank is rod-shaped and lies with the knife blade holder retracted like the crank valve on it in one plane perpendicular to the cutting direction, in which also the pivot axis of the crank and the hinge pin or the joint recess of the knife blade holder lie.
  • This will not only be the lever arm of the Extended crank, but also to extend the Knife blade holder required extension force minimized.
  • This applies to a relatively long extension path especially if the paddock in the Arranged near the edge of the knife blade holder which faces the free end of the crank. This contributes to a low-friction and thus to one easy actuation of the linkage when the Knife blade holder, the crank, the swivel axis with the bearing and the hinge pin are made of plastic.
  • the knife 10 which in particular, but not only, for cutting of cardboard boxes, from one in one Handle housing 11 against the force of a tension spring 12 Slidably guided knife blade holder 13 with knife blade 14 and one from a bottom Longitudinal slot 11a of the handle housing 11 protruding Extension 15, with the knife blade holder 13 is connected and in the event of friction intervention opposite with a cutting material, not shown the knife blade holder to the cutting direction (arrow x) 13 moved out of the handle housing 11.
  • the knife blade carrier is 13 with a hinge pin 16 or with a hinge recess provided which one or which with a a pivot axis 17 pivotable in the handle housing 11 Crank 18, a coupling 19 and the knife blade carrier 13 a coupling gear in the form of a pushing loop forms.
  • the coupling 19 consists of an elongated hole 20 in the manufactured as a flat punch Crank and from a cohesive Knife blade holder 13 fastened hinge pin 16, which engages in the elongated hole 20.
  • crank 18 is on hers Free end facing away from the pivot axis 17 as Extension 15 formed in its side view provided with a triangular shape with tip 15a is.
  • Figures 1 and 2 is the knife blade carrier 13 as a flat, inside the handle housing 11 positively guided slide formed on one side 13a not one from the drawing visible lead to the knife blade 14 and on its other, visible Page 13b the hinge pin 16 or alternatively a hinge recess having. Projections on a knife blade holder for holding a knife blade usual and not the subject of the invention.
  • the pivot axis 17 for the crank 18 is on arranged on the inside of the handle housing 11, that of page 13b of the knife blade holder 13 with the hinge pin 16 or the hinge recess is facing.
  • On his back End 13c is the blade holder 13 with a fastening pin 13d for articulating the tension spring 12 provided with their other end not at one visible housing pin articulated in the handle housing 11 is.
  • Fig. 1 extends when pulled in by the tension spring 12 Knife blade holder 13 the slot 20 with the Coupling 19 in a direction perpendicular to the cutting direction arrow x Level at which the Swivel axis 17 and the tip 15a of the free End 15 of the crank 18 and the hinge pin 16 or the joint recess of the knife blade holder 13 are.
  • the knife 10 For cutting operation, the knife 10 with the Tip 15a of the free end 15 of the crank 18 on the Surface of the material to be sliced on and then either under its own weight or under one not significant contact pressure in the direction of the Arrow x drawn according to FIG. 2, whereby the crank 18th counterclockwise in the direction of arrow 21 the pivot axis 17 pivots and through this Swiveling movement over the movable in the slot 20 Hinge pin 16 of the blade holder 13 with his Knife blade 14 in the direction of arrow 22 from the Handle housing 11 in the position shown for the intended purpose Use is pushed out.
  • the knife blade holder 13 When lifting the knife blade 14 and the free one End 15 of the crank 18 from the surface of the The knife blade holder 13 snaps material to be cut under the action of the tension spring 12 in the direction of Arrow x back into the handle housing 11.

Abstract

An autoretracting box-cutting knife has a housing dimensioned to be held in the hand and having a longitudinally forwardly projecting front end, a blade slide displaceable longitudinally in the housing between a front position and a rear position, and a blade secured in the slide, projecting forward from the housing in the front position of the slide, and retracted back into the housing in the rear position of the slide. In accordance with this invention a blade-actuating crank has an inner and an outer end and is mounted on a pivot on the housing that defines for the crank a transverse pivot axis. Interengaging formations on the crank and holder offset from the pivot can move the crank with the holder between a rear position with its outer end projecting laterally from the housing in the rear position of the holder and a front position in the front position of the holder. A spring engaged between the slide and the housing urges the holder and the crank into the respective rear positions so that when the outer end of the crank is pushed forward to push the crank into the front position the slide is pushed forward into its front position and the blade projects from the housing.

Description

Die Erfindung betrifft ein Messer, insbesondere Kartonmesser, mit einem in einem Griffgehäuse entgegen der Kraft einer Zugfeder gleitverschieblich geführten Messerklingenträger mit Messerklinge und mit einem aus einem unterseitigen Längsschlitz des Griffgehäuses herausragenden Fortsatz, der mit dem Messerklingenträger in Verbindung steht und bei Friktionseingriff mit dem Schneidgut entgegengesetzt zur Schneidrichtung den Messerklingenträger aus dem Griffgehäuse herausbewegt.The invention relates to a knife, in particular Cardboard knife, with one in a handle housing the force of a tension spring slidably guided Knife blade holder with knife blade and with one from an underside longitudinal slot of the handle housing outstanding extension, the one with the knife blade holder is connected and in the event of friction intervention with the material to be cut opposite to Cutting direction from the knife blade holder Handle housing moved out.

Bei einem bekannten Messer dieser Art gemäß der US-PS 3,999,290 besteht der aus einem unterseitigen Längsschlitz des Griffgehäuses herausragende Fortsatz aus einem Federstahldraht, der an seinem freien, herausragenden Ende etwa rechtwinklig zu einem Haken umgebogen ist und an seinem anderen, spiralförmig gewundenen Ende mit dem Messerklingenträger lösbar verbunden ist. Dieses Messer ist mit dem Nachteil behaftet, daß der Fortsatz bei Schneidgütern mit glatter Oberfläche abrutscht und infolge der zu geringen Friktion der Messerklingenträger mit dem Messer nicht aus dem Griffgehäuse herausgezogen wird. Bei zu weichem Schnittgut kann sich der Haken in der Schnittgutoberfläche festhaken, wodurch ein unerwünschter "Einreißvorschnitt" erfolgt, der den eigentlichen Schnittvorgang hemmt und infolge des Aufreißens der Oberfläche zu einem unansehnlichen Schnittbild führt. In jedem Fall, insbesondere bei Schnittgütern mit relativ glatter und harter Oberfläche, besteht die Gefahr, daß der Federstahldraht in den Längsschlitz zurückfedert und kein Herausziehen des Messerklingenträgers aus dem Griffgehäuse bewirkt.In a known knife of this type according to the US Pat. No. 3,999,290 consists of an underside Longitudinal slot of the handle housing protruding extension from a spring steel wire, which on its free, outstanding End bent at approximately a right angle into a hook is and on its other, spiral wound End detachably connected to the knife blade holder is. This knife has the disadvantage that the extension with cut goods with smoother Surface slips and due to the insufficient No friction of the knife blade holder with the knife is pulled out of the handle housing. In to soft clippings can become a catch in the Hook the clippings surface, creating an undesirable "Tear pre-cut" is made, the actual Cutting process inhibits and as a result of tearing the surface to an unsightly Cross section leads. In any case, especially with Clippings with a relatively smooth and hard surface, there is a risk that the spring steel wire in the longitudinal slot springs back and no pulling out of the knife blade holder from the handle housing.

Bei einem weiteren Messer der eingangs genannten Art gemäß der DE-A-37 44 456 besteht der Fortsatz aus einer Reibscheibe, die über ein einstufiges Stirnradgetriebe mit einer Zahnstange antriebsmäßig verbunden ist, die einen Teil des Messerklingenträgers bildet. Bei diesem Messer erfordert eine Reibscheibe mit glattem Außenumfang zur Erzeugung der erforderlichen Friktionskräfte zwischen diesem und der Oberfläche des Schneidgutes einen starken Anpreßdruck, der nicht immer wünschenswert ist. Ein gerändelter Außenumfang kann hier indessen bei weniger harten Oberflächen Abhilfe schaffen. Allerdings sind die Fertigung der Zahnradgetriebe und ihre Lagerung im Griffgehäuse mit einem gewissen Aufwand verbunden.In the case of another knife of the type mentioned Art according to DE-A-37 44 456 there is the extension from a friction disc that has a single stage Helical gear drive with a rack which is part of the knife blade carrier forms. This knife requires a friction disc with a smooth outer circumference to produce the required Friction forces between this and the Surface of the material to be cut has a strong contact pressure, which is not always desirable. A knurled one However, the outer circumference can be less remedy hard surfaces. However the manufacture of gear transmissions and their storage associated with a certain effort in the handle housing.

Ein gattungsfremdes Messer gemäß dem DE-GM 1 885 827 ist beidendig mit je einer von jeweils einem Abdeckorgan abgedeckten Klinge versehen, wobei die Abdeckorgane unter Wirkung einer doppelseitigen Kegelfeder stets in ihre abdeckende Lage gedrückt werden. Zum Schneiden wird das Messer möglichst senkrecht mit dem Abdeckorgan auf die zu schneidende Fläche aufgesetzt, entgegen der Wirkung der Kegelfeder aufgedrückt, bis die Spitze der Klinge mit dem Schneidgut in Eingriff gelangt. Abgesehen von seinem technischen Aufwand ist dieses Messer insofern verbesserungsbedürftig, als der Eingriff der Klingenspitze in das Schneidgut aufgrund des Abdeckorgans nicht exakt wahrgenommen werden kann, sondern von der Bedienungsperson abgeschätzt werden muß. Dies hat offenkundig auch der Erfinder dieses Messers erkannt und aus diesem Grunde eine Klinkensperre zur Einrastung des Abdeckorgans bei freigelegter Messerklinge angebracht. Dann aber entfällt die Schutzwirkung des Abdeckorgans.A non-generic knife according to the DE-GM 1 885 827 is at both ends with one of each a blade covered with a covering element, the covering elements under the action of a double-sided Taper spring always pressed into its covering position become. The knife is used for cutting if possible vertically with the cover to cutting surface, against the effect the conical spring is pressed open until the tip of the blade engages with the material to be cut. Apart from this knife is in terms of its technical complexity in need of improvement than the engagement of the blade tip into the material to be cut due to the covering element cannot be perceived exactly, but from the Operator must be estimated. This is obvious even the inventor of this knife recognized and for this reason a latch lock for snapping into place of the cover member with the knife blade exposed appropriate. But then the protective effect of the Cover member.

Und schließlich ist aus der WO 92/16337 ein Messer anderer Gattung bekannt geworden, dessen Griffgehäuse nach Art eines Pistolengriffes ausgebildet ist und dessen Messerklingenträger mittels eines am rückwärtigen Ende des Griffgehäuses angeordneten Schubknopfes per Daumendruck entgegen der Wirkung einer Rückholfeder aus dem freien Ende des pistolengriffartigen Griffgehäuses herausgedrückt werden muß. Dies ist einerseits ergonomisch ungünstig, da die Kraft des Daumens sowohl zum Herausdrücken des Messerklingenträgers entgegen der Kraft der Rückholfeder als auch zum Schneiden benötigt wird. Andererseits können Verletzungen beim Abheben der Messerklinge vom Schneidgut so lange nicht unterbunden werden, wie die Kraft des Daumens die Messerklinge in ausgefahrener Stellung hält. Denn der Sinn der gattungsgemäßen Messer beruht gerade darin, zu einer größeren Sicherheit der Bedienungsperson beizutragen, indem der Messerklingenträger mit dem Messer unter Wirkung der Rückholfeder automatisch in seine geschützte Position innerhalb des Griffgehäuses zurückfährt, sobald ein Friktionseingriff mit dem Schneidgut entfällt.And finally, from WO 92/16337 Knives of another genre have become known Handle housing designed like a pistol grip and its knife blade holder by means of a arranged at the rear end of the handle housing Push button with thumb pressure against the effect a return spring from the free end of the pistol grip-like Handle housing must be pushed out. On the one hand, this is ergonomically unfavorable because the Power of the thumb both for pushing out the knife blade holder against the force of the return spring as well as for cutting. On the other hand can cause injuries when lifting the knife blade from the Cuttings are not prevented as long as that Force the thumb to extend the knife blade Holds position. Because the sense of the generic Messer is based precisely on this, for greater security to contribute to the operator by the knife blade holder with the knife under the effect of Return spring automatically in its protected position retracts inside the handle housing as soon as one There is no frictional intervention with the material to be cut.

Von diesem Stand der Technik ausgehend, liegt der Erfindung die Aufgabe zugrunde, ein Messer der eingangs genannten Gattung zu schaffen, welches sich durch eine möglichst einfache, aber wirkungsvolle Anordnung der Bewegungstibertragung des herausragenden Fortsatzes bei Friktionseingriff mit dem Schneidgut auf den Messerklingenträger auszeichnet.Based on this state of the art the invention has for its object a knife to create the type mentioned above, which itself through a simple but effective arrangement the transmission of motion of the outstanding Extension when there is friction with the material to be cut on the knife blade holder.

Diese Aufgabe wird in Verbindung mit dem eingangs genannten Gattungsbegriff erfindungsgemäß dadurch gelöst, daß der Messerklingenträger mit einem Gelenkstift oder einer Gelenkausnehmung versehen ist, welche mit einer um eine Schwenkachse im Griffgehäuse verschwenkbaren Kurbel, einer Koppel und dem Messerklingenträger ein Koppelgetriebe in Form einer Schubschleife bilden. Durch diese Abkehr vom gesamten Stand der Technik mittels eines Koppelgetriebes ist der Eingriff des Fortsatzes mit dem Schneidgut nicht mehr die entscheidende, den Messerklingenträger herausschiebende Größe, sondern die Kurbel und diesbezüglich der Hebelarm zwischen Schwenkachse der Kurbel im Griffgehäuse und der mit dem Schneidgut in Eingriff befindlichen Spitze des Fortsatzes. Dadurch wird aus dem ursprünglichen Schleifvorgang zum Herausschieben des Messerklingenträgers nunmehr ein Schwenkvorgang mittels eines Koppelgetriebes in Form einer Schubschleife.This task is in conjunction with the beginning mentioned generic term according to the invention solved that the knife blade holder with a Hinge pin or a joint recess is provided, which with a around a pivot axis in the handle housing pivotable crank, a belt and the knife blade holder a coupling gear in the form of a pushing loop form. By turning away from the whole State of the art by means of a coupling gear the engagement of the extension with the material to be cut is not more the decisive one, pushing out the knife blade holder Size but the crank and in this regard the lever arm between the pivot axis of the crank in the handle housing and in engagement with the material to be cut located tip of the extension. Thereby becomes the original grinding process Now slide out the knife blade holder Swiveling process in the form of a coupling gear a push loop.

Bereits bei einem reinen Ziehvorgang des Fortsatzes über das Schneidgut bei kaum merklichem Druck wird die Kurbel im Sinne einer Ausschubbewegung des Messerklingenträgers entgegengesetzt zur Schneidrichtung um die Schwenkachse im Griffgehäuse derart verschwenkt, daß die mittels Zeigefinger oder Daumen auf das Griffgehäuse ausgeübten Druckkräfte nahezu ausschließlich dem Schneidvorgang vorbehalten bleiben. Already with a simple pulling process of the extension about the material to be cut with hardly noticeable pressure is the crank in the sense of an extension movement of the Knife blade holder opposite to the cutting direction pivoted about the pivot axis in the handle housing in such a way that with the index finger or thumb the grip housing exerts pressure almost exclusively remain reserved for the cutting process.

Bei der Ausbildung der Koppel sind unterschiedliche Ausführungsformen möglich:The formation of the paddock is different Possible designs:

Nach einer ersten vorteilhaften Ausführungsform wird die Koppel zwischen dem Messerklingenträger und der Kurbel von einem Langloch in der Kurbel in Verbindung mit dem Gelenkstift des Messerklingenträgers gebildet. Damit wird eine besonders flache Form mit einem relativ flachen Griffgehäuse erzielt.According to a first advantageous embodiment the coupling between the knife blade carrier and the crank is connected by an elongated hole in the crank with the hinge pin of the knife blade holder educated. This creates a particularly flat shape achieved a relatively flat handle housing.

Nach einer zweiten Ausführungsform besteht die Koppel zwischen Messerklingenträger und der Kurbel aus einem auf der Kurbel angeordneten Kurbelschieber mit Gelenkausnehmung und dem darin eingreifenden Gelenkstift des Messerklingenträgers.According to a second embodiment, the Coupling between the knife blade holder and the crank from a crank slide arranged on the crank with joint recess and the joint pin engaging therein of the knife blade holder.

Nach einer dritten Ausführungsform wird die Koppel zwischen Messerklingenträger und Kurbel von einem auf der Kurbel angeordneten Kurbelschieber mit Gelenkstift gebildet, der in eine Gelenkausnehmung im Messerklingenträger eingreift. Bei den beiden letztgenannten Ausführungsformen kann die Kurbel aus einem Stangenmaterial und der Kurbelschieber aus einem Rohrmaterial in fertigungstechnisch einfacher Weise hergestellt werden. Dabei kann wahlweise der Messerklingenträger mit einem über seine Seitenfläche vorstehenden Gelenkstift oder mit einer Gelenkausnehmung versehen werden, in die wiederum ein Gelenkstift des Kurbelschiebers eingreift.According to a third embodiment, the paddock between knife blade holder and crank by one crank slide with articulated pin arranged on the crank formed in a joint recess in Knife blade holder engages. With the latter two The crank can be made from one embodiment Rod material and the crank slide from one Pipe material in a technically simple manner getting produced. The knife blade holder can optionally be used with one protruding over its side surface Articulated pin or with a joint recess be provided, in turn, a hinge pin of the Crank slide engages.

Bei sämtlichen Ausführungsformen ist die Kurbel an ihrem von der Schwenkachse abgewandten, freien Ende mit dem Fortsatz versehen. Die Länge dieses Fortsatzes ist so ausgebildet, daß bei vollständigem Eintauchen dieses Fortsatzes in den unterseitigen Längsschlitz des Griffgehäuses sich der Messerklingenträger mit der Messerklinge in seiner aus dem Griffgehäuse herausgeschobenen Endstellung befindet. In Verbindung mit der damit einhergehenden Hebelarmlänge zwischen der Spitze des herausragenden Fortsatzes und der Schwenkachse der Kurbel ergeben sich unterschiedliche Bauvarianten mit minimalen Schwenkkräften der Kurbel zum Herausschieben des Messerklingenträgers.In all embodiments, the crank on their free, facing away from the pivot axis Provide the end with the extension. The length of this Extension is designed so that when complete Immerse this extension in the underside Longitudinal slot of the handle housing itself Knife blade holder with the knife blade in his end position pushed out of the handle housing located. In connection with the accompanying Lever arm length between the tip of the protruding Extension and the pivot axis of the crank result different construction variants with minimal Swiveling forces of the crank to push out the knife blade holder.

Vorteilhaft ist der Messerklingenträger als flacher, innerhalb des Griffgehäuses formschlüssig geführter Schieber ausgebildet, der auf seiner einen Seite einen Zapfen zur Aufnahme der Messerklinge und auf seiner anderen Seite den Gelenkstift aufweist. Grundsätzlich sind flache, innerhalb des Griffgehäuses formschlüssig geführte Schieber als Messerklingenträger bei gattungsgemäßen Messern bekannt, z.B. aus der US-PS 3,999,290.The knife blade holder is advantageous as flatter, form-fitting within the handle housing guided slide formed on his one Side a pin for receiving the knife blade and has the hinge pin on its other side. Basically, are flat, within the Handle housing form-fitting slide as Knife blade holder known for generic knives, e.g. from U.S. Patent 3,999,290.

Dabei ist die Schwenkachse für die Kurbel an derjenigen Innenseite des Griffgehäuses angeordnet, die der Seite des Messerklingenträgers mit dem Gelenkstift oder der Gelenkausnehmung zugewandt ist. Der Messerklingenträger ist vorteilhaft an seinem rückwärtigen Ende mit einem Befestigungsstift zur Anlenkung der Zugfeder versehen, die mit ihrem anderen Ende in an sich bekannter Weise an einem Gehäusestift im Griffgehäuse angelenkt ist. The pivot axis for the crank is on arranged on the inside of the handle housing, the side of the knife blade holder with the hinge pin or facing the joint recess. The knife blade holder is advantageous on his rear end with a fastening pin for articulation the tension spring provided with its other End in a manner known per se on a housing pin is articulated in the handle housing.

Nach einer besonders vorteilhaften Weiterbildung der Erfindung ist das freie Ende der scheibenförmigen Kurbel in seiner Seitenansicht dreieckförmig ausgebildet und erstreckt sich bei eingezogenem Messerklingenträger wie das Langloch in einer zur Schneidrichtung senkrechten Ebene, in welcher auch die Schwenkachse der Kurbel liegt. Durch diese Ausbildung liegt die Spitze des freien Endes der Kurbel in einer oberen Totpunktlage, aus welcher die Kurbel über einen relativ großen Schwenkwinkel und damit der Messerklingenträger über einen relativ großen Verschiebeweg aus dem Griffgehäuse herausgeschoben werden kann, bis das freie Ende der Kurbel in dessen unterseitigen Längsschlitz verschwindet. Dadurch wird die Handhabung des Messers entsprechend erleichtert.After a particularly advantageous training the invention is the free end of the disc-shaped The crank is triangular in its side view and extends when the knife blade holder is retracted like the slot in one to the cutting direction vertical plane, in which also the Pivot axis of the crank is. Through this training the tip of the free end of the crank lies in one top dead center from which the crank over a relatively large swivel angle and thus the knife blade holder over a relatively large one Slide out of the handle housing can be until the free end of the crank in its underside longitudinal slot disappears. This will the handling of the knife is correspondingly easier.

Nach einer weiteren vorteilhaften Ausführungsform der Erfindung ist die Kurbel stangenartig ausgebildet und liegt bei eingezogenem Messerklingenträger wie der auf ihr befindliche Kurbelschieber in einer zur Schneidrichtung senkrechten Ebene, in welcher auch die Schwenkachse der Kurbel sowie der Gelenkstift oder die Gelenkausnehmung des Messerklingenträgers liegen. Dadurch wird nicht nur der Hebelarm der Kurbel verlängert, sondern auch die zum Ausschub des Messerklingenträgers erforderliche Ausschubkraft minimiert. Das gilt bei einem relativ langen Ausschubweg insbesondere dann, wenn die Koppel in der Nähe des Randes des Messerklingenträgers angeordnet ist, die dem freien Ende der Kurbel zugekehrt ist. Dabei trägt zu einem reibungsarmen und damit zu einer leichten Betätigung des Koppelgetriebes bei, wenn der Messerklingenträger, die Kurbel, die Schwenkachse mit der Lagerung und der Gelenkstift aus Kunststoff bestehen.According to a further advantageous embodiment the invention, the crank is rod-shaped and lies with the knife blade holder retracted like the crank valve on it in one plane perpendicular to the cutting direction, in which also the pivot axis of the crank and the hinge pin or the joint recess of the knife blade holder lie. This will not only be the lever arm of the Extended crank, but also to extend the Knife blade holder required extension force minimized. This applies to a relatively long extension path especially if the paddock in the Arranged near the edge of the knife blade holder which faces the free end of the crank. This contributes to a low-friction and thus to one easy actuation of the linkage when the Knife blade holder, the crank, the swivel axis with the bearing and the hinge pin are made of plastic.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt. Dabei zeigen:

  • Fig. 1 die Seitenansicht auf das Messer bei teilweise abgenommenem Griffgehäuse mit der Ansicht auf den Messerklingenträger, die Kurbel und die Koppel bei in das Griffgehäuse zurückgezogener Messerklinge und
  • Fig. 2 die Ansicht von Fig. 1 bei aus dem Griffgehäuse herausgeschobener Messerklinge.
    • An embodiment of the invention is shown in the drawing. Show:
  • Fig. 1 shows the side view of the knife with the handle housing partially removed with a view of the knife blade carrier, the crank and the coupling with the knife blade retracted into the handle housing and
  • Fig. 2 is the view of Fig. 1 with the knife blade pushed out of the handle housing.

    • Gemaß den Figuren 1 und 2 besteht das Messer 10, welches insbesondere, jedoch nicht nur, zum Schneiden von Kartonagen bestimmt ist, aus einem in einem Griffgehäuse 11 entgegen der Kraft einer Zugfeder 12 gleitverschieblich geführten Messerklingenträger 13 mit Messerklinge 14 und aus einem aus einem unterseitigen Längsschlitz 11a des Griffgehäuses 11 herausragenden Fortsatz 15, der mit dem Messerklingenträger 13 in Verbindung steht und bei Friktionseingriff mit einem nicht dargestellten Schneidgut entgegengesetzt zur Schneidrichtung (Pfeil x) den Messerklingenträger 13 aus dem Griffgehäuse 11 herausbewegt.According to Figures 1 and 2, the knife 10, which in particular, but not only, for cutting of cardboard boxes, from one in one Handle housing 11 against the force of a tension spring 12 Slidably guided knife blade holder 13 with knife blade 14 and one from a bottom Longitudinal slot 11a of the handle housing 11 protruding Extension 15, with the knife blade holder 13 is connected and in the event of friction intervention opposite with a cutting material, not shown the knife blade holder to the cutting direction (arrow x) 13 moved out of the handle housing 11.

    Erfindungsgemäß ist der Messerklingenträger 13 mit einem Gelenkstift 16 oder mit einer Gelenkausnehmung versehen, welcher bzw. welche mit einer um eine Schwenkachse 17 im Griffgehäuse 11 verschwenkbaren Kurbel 18, einer Koppel 19 und dem Messerklingenträger 13 ein Koppelgetriebe in Form einer Schubschleife bildet.According to the invention, the knife blade carrier is 13 with a hinge pin 16 or with a hinge recess provided which one or which with a a pivot axis 17 pivotable in the handle housing 11 Crank 18, a coupling 19 and the knife blade carrier 13 a coupling gear in the form of a pushing loop forms.

    Im dargestellten Fall besteht die Koppel 19 aus einem Langloch 20 in der als flaches Stanzstück hergestellten Kurbel und aus einem stoffschlüssig am Messerklingenträger 13 befestigten Gelenkstift 16, der in das Langloch 20 eingreift.In the case shown, the coupling 19 consists of an elongated hole 20 in the manufactured as a flat punch Crank and from a cohesive Knife blade holder 13 fastened hinge pin 16, which engages in the elongated hole 20.

    Es ist jedoch auch möglich, die Koppel 19 zwischen dem Messerklingenträger 13 und der Kurbel 18 als einen auf der Kurbel 18 verschieblich angeordneten Kurbelschieber mit Gelenkausnehmung auszubilden, in welche der Gelenkstift 16 des Messerklingenträgers 13 formschlüssig, jedoch relativbeweglich eingreift.However, it is also possible to connect the coupling 19 between the knife blade carrier 13 and the crank 18 slidable as one on the crank 18 to design arranged crank slide with joint recess, into which the hinge pin 16 of the knife blade holder 13 form-fitting, but relatively flexible intervenes.

    Und schließlich kann nach einer dritten Ausführungsform die Koppel 19 zwischen Messerklingenträger 13 und Kurbel 18 aus einem auf der Kurbel 18 angeordneten Kurbelschieber mit Gelenkstift 16 bestehen, der in eine Gelenkausnehmung im Messerklingenträger 13 eingreift.And finally, according to a third embodiment the coupling 19 between the knife blade carrier 13 and crank 18 from one on crank 18 arranged crank slide with hinge pin 16, which in a joint recess in Knife blade holder 13 engages.

    Im dargestellten Fall ist die Kurbel 18 an ihrem von der Schwenkachse 17 abgewandten, freien Ende als Fortsatz 15 ausgebildet, der in seiner Seitenansicht mit einer dreieckförmigen Gestalt mit Spitze 15a versehen ist.In the case shown, the crank 18 is on hers Free end facing away from the pivot axis 17 as Extension 15 formed in its side view provided with a triangular shape with tip 15a is.

    In den Figuren 1 und 2 ist der Messerklingenträger 13 als flacher, innerhalb des Griffgehäuses 11 formschlüssig geführter Schieber ausgebildet, der auf seiner einen Seite 13a einen aus der Zeichnung nicht ersichtlichen Vorsprung zur Aufnahme der Messerklinge 14 und auf seiner anderen, sichtbaren Seite 13b den Gelenkstift 16 oder alternativ eine Gelenkausnehmung aufweist. Vorsprünge auf einem Messerklingenträger zur Aufnahme einer Messerklinge sind üblich und nicht Gegenstand der Erfindung.In Figures 1 and 2 is the knife blade carrier 13 as a flat, inside the handle housing 11 positively guided slide formed on one side 13a not one from the drawing visible lead to the knife blade 14 and on its other, visible Page 13b the hinge pin 16 or alternatively a hinge recess having. Projections on a knife blade holder for holding a knife blade usual and not the subject of the invention.

    Die Schwenkachse 17 für die Kurbel 18 ist an derjenigen Innenseite des Griffgehäuses 11 angeordnet, die der Seite 13b des Messerklingenträgers 13 mit dem Gelenkstift 16 oder der Gelenkausnehmung zugewandt ist. An seinem rückwärtigen Ende 13c ist der Messerklingenträger 13 mit einem Befestigungsstift 13d zur Anlenkung der Zugfeder 12 versehen, die mit ihrem anderen Ende an einem nicht sichtbaren Gehäusestift im Griffgehäuse 11 angelenkt ist.The pivot axis 17 for the crank 18 is on arranged on the inside of the handle housing 11, that of page 13b of the knife blade holder 13 with the hinge pin 16 or the hinge recess is facing. On his back End 13c is the blade holder 13 with a fastening pin 13d for articulating the tension spring 12 provided with their other end not at one visible housing pin articulated in the handle housing 11 is.

    Wie aus Fig. 1 entnommen werden kann, erstreckt sich bei von der Zugfeder 12 eingezogenem Messerklingenträger 13 das Langloch 20 mit der Koppel 19 in einer zur Schneidrichtung Pfeil x senkrechten Ebene, in welcher sich auch die Schwenkachse 17 sowie die Spitze 15a des freien Endes 15 der Kurbel 18 sowie der Gelenkstift 16 bzw. die Gelenkausnehmung des Messerklingenträgers 13 befinden.As can be seen from Fig. 1, extends when pulled in by the tension spring 12 Knife blade holder 13 the slot 20 with the Coupling 19 in a direction perpendicular to the cutting direction arrow x Level at which the Swivel axis 17 and the tip 15a of the free End 15 of the crank 18 and the hinge pin 16 or the joint recess of the knife blade holder 13 are.

    Zur reibungsarmen Funktion der Schubschleife bestehen der Messerklingenträger 13, die Kurbel 18, die Schwenkachse 17 und der Gelenkstift 16 aus Kunststoff.Insist on the low-friction function of the push loop the knife blade carrier 13, the crank 18, the Swivel axis 17 and the hinge pin 16 made of plastic.

    Zur Schneidbetätigung wird das Messer 10 mit der Spitze 15a des freien Endes 15 der Kurbel 18 auf der Oberfläche des Schneidgutes aufgesetzt und sodann entweder unter seinem Eigengewicht oder unter einer nicht erwähnenswerten Anpreßkraft in Richtung des Pfeiles x gemäß Fig. 2 gezogen, wodurch die Kurbel 18 in Richtung des Pfeiles 21 im Gegenuhrzeigersinn um die Schwenkachse 17 verschwenkt und durch diese Schwenkbewegung über den im Langloch 20 beweglichen Gelenkstift 16 der Messerklingenträger 13 mit seiner Messerklinge 14 in Richtung des Pfeiles 22 aus dem Griffgehäuse 11 in die dargestellte Position zum bestimmungsgemäßen Gebrauch herausgeschoben wird.For cutting operation, the knife 10 with the Tip 15a of the free end 15 of the crank 18 on the Surface of the material to be sliced on and then either under its own weight or under one not significant contact pressure in the direction of the Arrow x drawn according to FIG. 2, whereby the crank 18th counterclockwise in the direction of arrow 21 the pivot axis 17 pivots and through this Swiveling movement over the movable in the slot 20 Hinge pin 16 of the blade holder 13 with his Knife blade 14 in the direction of arrow 22 from the Handle housing 11 in the position shown for the intended purpose Use is pushed out.

    Beim Abheben der Messerklinge 14 und des freien Endes 15 der Kurbel 18 von der Oberfläche des Schneidgutes schnellt der Messerklingenträger 13 unter Wirkung der Zugfeder 12 in Richtung des Pfeiles x in das Griffgehäuse 11 zurück.When lifting the knife blade 14 and the free one End 15 of the crank 18 from the surface of the The knife blade holder 13 snaps material to be cut under the action of the tension spring 12 in the direction of Arrow x back into the handle housing 11.

    Claims (11)

    1. Knife (10), in particular a knife for cardboard, having a knife-blade carrier (13) which is guided in a handle casing (11) so as to be slidingly displaceable against the force of a draw-spring (12) and has a knife blade (14), and having an extension (15A) which protrudes from a longitudinal slit on the underside of the handle casing and is connected to the knife-blade carrier (13) and which, when there is frictional engagement, in the opposite direction to the direction of cutting, with the material to be cut, moves the said knife-blade carrier (13) out of the handle casing (11), characterised in that the knife-blade carrier (13) is provided with an articulating pin (16) or an articulating recess which combines with a crank (18), which is swivellable about a swivel pin (17) in the handle casing (11), with a link (19) and with the knife-blade carrier (13) to form a linkage (13, 18, 19) in the form of a thrusting loop.
    2. Knife according to claim 1, characterised in that the link between the knife-blade carrier (13) and the crank (18) is formed by a slot (20) in the said crank (18) in conjunction with the articulating pin (16) of the knife-blade carrier (13).
    3. Knife according to claim 1, characterised in that the link between the knife-blade carrier (13) and the crank consists of a crank slide disposed on the said crank (18) and having an articulating recess, and of the articulating pin (16), which engages therein, of the knife-blade carrier (13).
    4. Knife according to claim 1, characterised in that the link between the knife-blade carrier (13) and the crank (18) consists of a crank slide disposed on the said crank (18) and having an articulating pin (16) which engages in an articulating recess in the knife-blade carrier (13).
    5. Knife according to one of claims 1 to 4, characterised in that the crank (18) is provided with the extension (15) at its free end which faces away from the swivel pin (17).
    6. Knife according to one of claims 1 to 5, characterised in that the knife-blade carrier (13) is constructed as a flat slide which is guided in a form-locking manner inside the handle casing (11) and has, on one of its sides (13a), a projection for receiving the knife blade (14) and, on its other side (13b), the articulating pin (16) or the articulating recess.
    7. Knife according to one of claims 1 to 6, characterised in that the swivel pin (17) for the crank (18) is disposed on that inner side of the handle casing (11) which faces towards the side (13b) of the knife-blade carrier (13) having the articulating pin (16) or the articulating recess.
    8. Knife according to one of claims 1 to 7, characterised in that the knife-blade carrier (13) is provided, at its rearward end (13c), with a fastening pin (13d) for linking-on the draw-spring (12) which is linked, by its other end, onto a casing pin in the handle casing (11).
    9. Knife according to one of claims 1 to 8, characterised in that the free end (15) of the plate-shaped crank (18) is of triangular construction in its side elevation and, when the knife-blade carrier (13) is drawn in, extends, like the slot (20), in a plane which is perpendicular to the direction of cutting (arrow x) and in which the swivel pin (17) of the crank (18) also lies.
    10. Knife according to one of claims 1 to 8, characterised in that the crank (18) is of bar-like construction and, when the knife-blade carrier (13) is drawn in, lies, like the crank slide disposed on it, in a plane which is perpendicular to the direction of cutting (arrow x) and in which the swivel pin (17) of the crank (18), and also the articulating pin (16) or articulating recess of the knife-blade carrier (13), also lie.
    11. Knife according to one of claims 1 to 10, characterised in that the knife-blade carrier (13), the crank (18), the swivel pin (17) and the articulating pin (16) consist of plastic.
    EP95119265A 1995-03-03 1995-12-07 Card board box knife Expired - Lifetime EP0729811B1 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    DE19507272 1995-03-03
    DE19507272A DE19507272C1 (en) 1995-03-03 1995-03-03 Knife, especially for cardboard, with blade holder

    Publications (2)

    Publication Number Publication Date
    EP0729811A1 EP0729811A1 (en) 1996-09-04
    EP0729811B1 true EP0729811B1 (en) 1999-06-23

    Family

    ID=7755444

    Family Applications (1)

    Application Number Title Priority Date Filing Date
    EP95119265A Expired - Lifetime EP0729811B1 (en) 1995-03-03 1995-12-07 Card board box knife

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    US (1) US5617635A (en)
    EP (1) EP0729811B1 (en)
    AT (1) ATE181525T1 (en)
    DE (1) DE19507272C1 (en)
    DK (1) DK0729811T3 (en)

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    Also Published As

    Publication number Publication date
    DK0729811T3 (en) 1999-11-22
    DE19507272C1 (en) 1995-09-28
    ATE181525T1 (en) 1999-07-15
    EP0729811A1 (en) 1996-09-04
    US5617635A (en) 1997-04-08

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