EP0314894B1 - Cardboard safety cutter - Google Patents

Cardboard safety cutter Download PDF

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Publication number
EP0314894B1
EP0314894B1 EP88114440A EP88114440A EP0314894B1 EP 0314894 B1 EP0314894 B1 EP 0314894B1 EP 88114440 A EP88114440 A EP 88114440A EP 88114440 A EP88114440 A EP 88114440A EP 0314894 B1 EP0314894 B1 EP 0314894B1
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EP
European Patent Office
Prior art keywords
holding
guiding element
blade
knife according
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 - Lifetime
Application number
EP88114440A
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German (de)
French (fr)
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EP0314894A1 (en
Inventor
Ewald Helmut Beermann
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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Application filed by Martor Argentax EH Beermann KG filed Critical Martor Argentax EH Beermann KG
Priority to AT88114440T priority Critical patent/ATE62439T1/en
Publication of EP0314894A1 publication Critical patent/EP0314894A1/en
Application granted granted Critical
Publication of EP0314894B1 publication Critical patent/EP0314894B1/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

Definitions

  • the invention relates to a knife with a hollow handle body, in which a stationary holding and guiding element is received, which protrudes from the end of the handle body, in which a blade holder is also relatively displaceably received, which is connected to the stationary holding and guiding element via a tension spring connected is.
  • Such a knife is known from DE-B-27 36 395.
  • the knife can be locked in its working position with the blade extended by means of an outwardly protruding actuating handle by transverse pressure on the thumb.
  • the handle is released, the blade holder and blade are returned to the hollow knife handle by the spring tension.
  • This feature represents an essential safety factor against injuries to the operator.
  • the time-consuming blade change which is to be carried out at certain time intervals is perceived as being in need of improvement. The process should be quicker to do.
  • the construction of the known knife is quite complex, so that it can only be used in preferred areas of application, but with considerable advantage there.
  • the invention has for its object to design the knife of the type mentioned so that the blade change can be carried out quickly and safely in a simple manner.
  • a simple, less expensive design is sought, which is the prerequisite for a knife which can be used in many work areas, in particular when cutting cardboard boxes.
  • the knife is designed such that the handle body represents a grip sleeve which is substantially rectangular in cross section and, on the blade-side end facing away from the holding and guide element, has engagement recesses into which the blade holder, which consists of two side elements enclosing the blade, projects.
  • the blade holder is easily accessible by simply pulling the holding and guiding element out of the grip sleeve, so that the desired rapid blade change is made possible.
  • a knife without a tension spring is known, the handle body of which is designed as a rectangularly rectangular handle sleeve.
  • the known grip sleeve has one end face a floor.
  • the known knife has neither a blade holder comparable with the subject matter of the invention nor engagement recesses on the handle body side.
  • a side element of the blade holder has two guide ribs, which are slidably received by guide grooves of the stationary holding element. Tilting of the blade holder, which leads to jamming of the blade and thus to one This eliminates the risk of injury.
  • One end of the guide ribs expediently carries a stop which engages in an elongate opening within the stationary holding element. This elongated opening thus represents a movement limitation for the displacement of the blade holder. When the stop is in contact with the front end of the opening, the blade is in the working position.
  • the second guide groove opens at its rear end in an opening in the stationary holding and guiding element.
  • the second side element opposite the side element carrying the guide ribs has Knife dowel pins in the direction of displacement, which engage in fitting holes of the stationary holding element. This ensures the blade change insofar as when the side part carrying the guide ribs is tilted, the second side element is firmly locked in its position on these dowel pins even when the tension spring is acting eccentrically.
  • the stationary holding and guiding element forms a rigid unit with the side part in this position, so that when changing the blade the blade can be placed on the side part without the risk of folding away under tension spring action.
  • the dowel pins and dowel holes are preferably shorter than the guide ribs of the side element.
  • a side element of the blade holder carries a holding projection for the tension spring on a projecting tab, which is arranged in a longitudinal groove of the stationary holding and guiding element, which in turn carries the opposite holding projection for the spring.
  • the spring is thus encompassed on three sides by the holding and guiding element and is thus protected against operation.
  • the holding projection of the side element for the spring is expediently overlapped by a recess in a tab provided on the opposite side element. A sliding of the spring is therefore excluded and a secure mounting is guaranteed.
  • the side elements of the blade holder preferably have a profiling on the outside in order to facilitate the transfer into the working position.
  • the end of the stationary holding and guiding element is provided with engagement troughs on the part protruding beyond the grip sleeve, which make it easier to pull the knife out of the grip sleeve.
  • the grip sleeve itself is preferably formed from an essentially rectangular sheet metal blank and has mutually opposite engagement recesses for the blade holder.
  • FIG 1 and 2 show a side view of the knife, provided in its entirety with the reference number 10, in the rest position on the one hand and in the working position on the other hand.
  • the blade holder 11 with the blade 12 received by it can be extended against the pull of a spring 31 out of the grip sleeve 13.
  • the knife 10 is then in the working position shown in FIG. 2.
  • the spring force and self-locking can be adjusted so that the knife remains in the working position during the cutting process due to the cutting resistance counteracting the spring restoring force, and snaps back into the grip sleeve 13 immediately after relieving the pressure (ending the cutting work), which makes working pleasant and at the same time the desired one high security against injuries to the operator is guaranteed.
  • FIG. 3 shows the holder of the blade 12 on the basis of a cross-sectional illustration.
  • a first and a second side element 15 and 16 enclose the blade 12 between them and are in positive engagement with one another.
  • Positioning projections 17 provided on the second side element 16 pass through bores in the blade 12 and engage with corresponding cutouts in the first side element 15.
  • the two side elements 15 and 16 are slidably received by the grip sleeve 13.
  • Fig. 4 shows the holding and guiding element 18, the outer contour of which corresponds substantially to the inner dimensions of the grip sleeve 13 in the area of a main body, so that it can be slidably received by the latter against frictional resistance.
  • the holding and guiding element 18 carries a shoulder 19 which is supported at the rear end of the grip sleeve 13.
  • Engagement troughs 20 facilitate the pulling out of the element 18 together with the blade holder 11 from the grip sleeve 13.
  • An end bore 21 serves as a suspension opening or for fastening a cord.
  • the opposite guide groove 23 of the element 18 also has an elongated but somewhat shorter opening 28 in the bottom of the groove.
  • the opening 28 is able to receive the end of the guide rib 25 when the side element 15 is opened, as will be explained in more detail later with reference to FIG. 7 will have to be explained.
  • the holding and guiding element 18 is also provided in the direction of displacement of the blade holder 11 with a central longitudinal groove 29 which carries a holding projection 30 for the tension spring 31 at its rear end.
  • the tension spring 31 is received by the longitudinal groove 29.
  • the opposite end of the tension spring 31 is held on a projection 32 which is carried by a tab 33 which is centered on the holding and guiding element 18 Side of the second side element 16 is located.
  • a corresponding tab 34 of the opposite side element 15 there is a recess 35 which, in the assembled state of the knife, engages around an axial projection of the projection 32 of the side element 16 so that the eye of the tension spring 31 is offered a secure hold.
  • the second side element 16 carries a somewhat eccentric longitudinal recess for receiving the blade 12. Position projections 17 of the side element 16 already mentioned in connection with FIG. 3 pass through corresponding openings in the blade 12 and are overlapped by recesses 35 in the first side element 15.
  • the side element 15 is provided with an eccentric longitudinal projection which engages in the longitudinal recess of the opposite side element 16, so that the blade 12 is held and secured in a form-fitting manner.
  • Both side elements 15 and 16 each have a bevel 36 and 37 at a front corner, beyond which the cutting edge 44 of the blade 12 protrudes, so that it can be brought into engagement with the material to be processed.
  • the second side element 16 carries dowel pins 39 and 38 in the direction of movement x (longitudinal axial direction) on the side facing the holding and guiding element 18, which bores 40 and 41 are made in corresponding holes in the holding and guiding element 18 intervention.
  • the second side element 16 is fixed to the holding and guiding element 18, even when the first side element 15 is removed, in order to replace the blade 12, ie it is also secured against tipping under the action of the tension spring 31.
  • FIG. 6 shows the holding and guiding element 18 with the tension spring 31 inserted and with the side element 15 attached.
  • the blade 12 is now enclosed between the two side elements 15 and 16.
  • the two side elements 15 and 16 carry profilings 42 to improve the engagement when the knife 10 is actuated.
  • the grip sleeve 13 is formed from a substantially rectangular sheet metal blank by means of appropriate bevels. As is clear from FIGS. 1 and 2, it bears mutually opposite engagement recesses 43 in the area of the blade holder 11, through which the profiling 42 of the blade holder 11 can be gripped.
  • the grip sleeve 13 can be provided with a layer of lacquer or any desired design.
  • FIG. 7 shows the holding and guiding element 18 with the side element 15 pivoted out for exchanging the blade 12.
  • the outer end of the guiding rib 25 and correspondingly the end of the guiding rib 24 which is not visible here penetrate through the openings 27 and 29 in FIG Guide grooves 22 and 23 of the holding and guiding element 18.
  • the side element 15 is held during the blade changing process, so that it does not need to be put down.
  • the side element 15 is pivoted back again and practically inevitably, including the blade 12, lies on the second side element 16 by the recess 35 engaging around the retaining projection 32 for the corresponding spring eye of the tension spring 31.

Abstract

A cutter with a cutter-blade mounting which is guided longitudinally displaceably and is tension spring-loaded in the direction of the hollow cutter handle comprises a stationary holding and guiding element (18) which is displaceably received by the handle sleeve of substantially rectangular shape in cross-section. Side elements (16), which enclose the blade (12) between them, are held against the holding and guiding element (18) under tensile load via a tension spring (31). They are guided longitudinally displaceably via guiding ribs which engage in slots (22, 23) formed on the holding and guiding element (18). One side element (16) is provided with fitting pins (38, 39) which engage in bores (40, 41) of the holding and guiding element (18) in order to fix said side element. <IMAGE>

Description

Die Erfindung betrifft ein Messer mit hohlem Griffkörper, in welchem ein stationäres Halte-und Führungselement aufgenommen ist, das endseitig aus dem Griffkörper hinausragt, in welchem außerdem zu diesem relativ verschieblich eine Klingenhalterung aufgenommen ist, welche über eine Zugfeder mit dem stationären Halte- und Führungselement verbunden ist.The invention relates to a knife with a hollow handle body, in which a stationary holding and guiding element is received, which protrudes from the end of the handle body, in which a blade holder is also relatively displaceably received, which is connected to the stationary holding and guiding element via a tension spring connected is.

Ein derartiges Messer ist aus der DE-B-27 36 395 bekannt. Das Messer ist in seiner Arbeitsstellung bei ausgefahrener Klinge durch eine nach außen ragende Betätigungshandhabe durch Daumen-Querdruck arretierbar. Bei Freigabe der Handhabe wird die Klingenhalterung samt Klinge durch den Federzug in den hohlen Messergriff zurückgeführt. Dieses Merkmal stellt ein wesentliches Sicherheitsmoment gegenüber Verletzungen der Bedienungsperson dar. Als verbesserungsbedürftig wird jedoch der aufwendige, in bestimmten Zeitintervallen durchzuführende Klingenwechsel empfunden. Der Vorgang sollte rascher durchführbar sein. Zudem ist die Bauweise des bekannten Messers recht aufwendig, so daß es nur in bevorzugten Anwendungsbereichen, dort indes mit erheblichem Vorteil, eingesetzt werden kann.Such a knife is known from DE-B-27 36 395. The knife can be locked in its working position with the blade extended by means of an outwardly protruding actuating handle by transverse pressure on the thumb. When the handle is released, the blade holder and blade are returned to the hollow knife handle by the spring tension. This feature represents an essential safety factor against injuries to the operator. However, the time-consuming blade change which is to be carried out at certain time intervals is perceived as being in need of improvement. The process should be quicker to do. In addition, the construction of the known knife is quite complex, so that it can only be used in preferred areas of application, but with considerable advantage there.

Angesichts dieser Problematik liegt der Erfindung die Aufgabe zugrunde, das Messer der eingangs genannten Art so auszugestalten, daß sich der Klingenwechsel in einfacher Weise rasch und gefahrlos durchführen läßt. Außerdem wird eine einfache, weniger kostenaufwendige Bauform angestrebt, die Voraussetzung für ein in vielen Arbeitsgebieten, insbesondere beim Aufschneiden von Kartons, einsetzbares Messer bildet.In view of this problem, the invention has for its object to design the knife of the type mentioned so that the blade change can be carried out quickly and safely in a simple manner. In addition, a simple, less expensive design is sought, which is the prerequisite for a knife which can be used in many work areas, in particular when cutting cardboard boxes.

Gelöst wird diese Aufgabe gemäß der Erfindung durch die im Kennzeichen des Hauptanspruches angegebenen Merkmale, wobei hinsichtlich bevorzugter Ausführungsformen des erfindungsgemäßen Messers auf die Merkmale der Unteransprüche verwiesen wird.This object is achieved according to the invention by the features specified in the characterizing part of the main claim, reference being made to the features of the subclaims with regard to preferred embodiments of the knife according to the invention.

Nach der Erfindung ist das Messer so ausgebildet, daß der Griffkörper eine im Querschnitt im wesentlichen rechteckförmige Griffhülse darstellt und am dem Halte- und Führungselement abgewandten, klingenseitigen Ende Eingriffsaussparungen aufweist, in welche die aus zwei die Klinge zwischen sich einschließenden Seitenelementen bestehende Klingenhalterung hineinragt. Damit ist die Klingenhalterung durch bloßes Herausziehen des Halte- und Führungselementes aus der Griffhülse ohne weiteres zugänglich, so daß der angestrebte rasche Klingenwechsel ermöglicht wird.According to the invention, the knife is designed such that the handle body represents a grip sleeve which is substantially rectangular in cross section and, on the blade-side end facing away from the holding and guide element, has engagement recesses into which the blade holder, which consists of two side elements enclosing the blade, projects. Thus, the blade holder is easily accessible by simply pulling the holding and guiding element out of the grip sleeve, so that the desired rapid blade change is made possible.

Von der US-A-1 521 084 ist ein Messer ohne Zugfeder bekannt, dessen Griffkörper als im Querschnitt rechteckförmige Griffhülse ausgebildet ist. Die bekannte Griffhülse weist im Unterschied zum Erfindungsgegenstand an einer Stirnseite einen Boden auf. Zudem weist das bekannte Messer weder eine mit dem Erfindungsgegenstand vergleichbare Klingenhalterung noch griffkörperseitig Eingriffsaussparungen auf.From US-A-1 521 084 a knife without a tension spring is known, the handle body of which is designed as a rectangularly rectangular handle sleeve. In contrast to the subject matter of the invention, the known grip sleeve has one end face a floor. In addition, the known knife has neither a blade holder comparable with the subject matter of the invention nor engagement recesses on the handle body side.

Gemäß einer bevorzugten Ausführungsform weist ein Seitenelement der Klingenhalterung zwei Führungsrippen auf, die von Führungsnuten des stationären Halteelementes gleitend aufgenommen sind. Ein Verkanten der Klingenhalterung, die zu einem Verklemmen der Klinge und damit zu einer Verletzungsgefahr führen könnte, ist hierdurch ausgeschlossen. Zweckmäßigerweise trägt eine der Führungsrippen endseitig einen Anschlag, der in eine längliche Durchbrechung innerhalb des stationären Halteelementes eingreift. Diese längliche Durchbrechung stellt damit eine Bewegungsbegrenzung für die Verschiebung der Klingenhalterung dar. Bei Anlage des Anschlages am vorderseitigen Ende der Durchbrechung befindet sich die Klinge in Arbeitsstellung.According to a preferred embodiment, a side element of the blade holder has two guide ribs, which are slidably received by guide grooves of the stationary holding element. Tilting of the blade holder, which leads to jamming of the blade and thus to one This eliminates the risk of injury. One end of the guide ribs expediently carries a stop which engages in an elongate opening within the stationary holding element. This elongated opening thus represents a movement limitation for the displacement of the blade holder. When the stop is in contact with the front end of the opening, the blade is in the working position.

Gemäß einer besonders vorteilhaften Ausgestaltung mündet die zweite Führungsnut an ihrem rückwärtigen Ende in einer Durchbrechung des stationären Halte- und Führungselementes. Diese Ausgestaltung ermöglicht ein Kippen bzw. Verschwenken des die Führungsrippen tragenden Seitenteils der Klingenhalterung nach oben. Bei einem Klingenwechsel ist es somit nicht mehr erforderlich, Teile der Klingenhalterung vollständig zu lösen und abzulegen. Durch ein Kippen des Seitenteils um 90° nach oben greifen die beiden Führungsrippen in die jeweiligen Durchbrechungen des Halte- und Führungselementes ein und geben die Klinge frei, die nunmehr ausgewechselt oder gewendet werden kann. Nach einem Zurückklappen des Seitenteils ist die Klinge gesichert, und nach dem Einschieben in die Griffhülse kann das Messer erneut eingesetzt werden.According to a particularly advantageous embodiment, the second guide groove opens at its rear end in an opening in the stationary holding and guiding element. This configuration enables the side part of the blade holder carrying the guide ribs to be tilted or pivoted upward. When changing the blade, it is no longer necessary to completely loosen and remove parts of the blade holder. By tilting the side part upwards by 90 °, the two guide ribs engage in the respective openings in the holding and guiding element and release the blade, which can now be replaced or turned. After the side part has been folded back, the blade is secured and the knife can be reinserted after being inserted into the grip sleeve.

Das dem die Führungsrippen tragenden Seitenelement gegenüberliegende zweite Seitenelement weist gemäß einer Ausgestaltung des erfindungsgemäßen Messers Paßstifte in Verschieberichtung auf, die in Paßbohrungen des stationären Halteelementes eingreifen. Hierdurch wird der Klingenwechsel insofern abgesichert, als bei einem Kippen des die Führungsrippen tragenden Seitenteils das zweite Seitenelement an diesen Paßstiften auch bei exzentrisch angreifender Zugfeder in seiner Lage fest arretiert ist. Das stationäre Halte- und Führungselement bildet in dieser Position mit dem Seitenteil eine starre Einheit, so daß beim Klingenwechsel die Klinge auf das Seitenteil aufgelegt werden kann, ohne daß die Gefahr des Wegklappens unter Zugfederwirkung besteht. Bevorzugt sind die Paßstifte und Paßbohrungen kürzer als die Führungsrippen des Seitenelementes.According to one embodiment of the invention, the second side element opposite the side element carrying the guide ribs has Knife dowel pins in the direction of displacement, which engage in fitting holes of the stationary holding element. This ensures the blade change insofar as when the side part carrying the guide ribs is tilted, the second side element is firmly locked in its position on these dowel pins even when the tension spring is acting eccentrically. The stationary holding and guiding element forms a rigid unit with the side part in this position, so that when changing the blade the blade can be placed on the side part without the risk of folding away under tension spring action. The dowel pins and dowel holes are preferably shorter than the guide ribs of the side element.

Ein Seitenelement der Klingenhalterung trägt gemäß einer bevorzugten Ausgestaltung der Erfindung an einer vorspringenden Lasche einen Haltevorsprung für die Zugfeder, die in einer Längsnut des stationären Halte- und Führungselementes angeordnet ist, welche ihrerseits endseitig den gegenüberliegenden Haltevorsprung für die Feder trägt. Damit ist die Feder von dem Halte- und Führungselement dreiseitig umgriffen und dadurch funktionsgeschützt. Zweckmäßig ist der Haltevorsprung des Seitenelementes für die Feder von einer Aussparung einer entsprechend an dem gegenüberliegenden Seitenelement vorgesehenen Lasche übergriffen. Ein Abgleiten der Feder ist somit ausgeschlossen und eine sichere Halterung gewährleistet.According to a preferred embodiment of the invention, a side element of the blade holder carries a holding projection for the tension spring on a projecting tab, which is arranged in a longitudinal groove of the stationary holding and guiding element, which in turn carries the opposite holding projection for the spring. The spring is thus encompassed on three sides by the holding and guiding element and is thus protected against operation. The holding projection of the side element for the spring is expediently overlapped by a recess in a tab provided on the opposite side element. A sliding of the spring is therefore excluded and a secure mounting is guaranteed.

Die Seitenelemente der Klingenhalterung tragen außen bevorzugt eine Profilierung, um die Überführung in die Arbeitsposition zu erleichtern. Das stationäre Halte- und Führungselement ist endseitig an dem über die Griffhülse hinausragenden Teil mit Eingriffsmulden versehen, die ein Herausziehen des Messers aus der Griffhülse erleichtern. Die Griffhülse selbst ist bevorzugt aus einem im wesentlichen rechteckförmigen Blechrohling gebildet und weist endseitig einander gegenüberliegende Eingriffsaussparungen für die Klingenhalterung auf.The side elements of the blade holder preferably have a profiling on the outside in order to facilitate the transfer into the working position. The end of the stationary holding and guiding element is provided with engagement troughs on the part protruding beyond the grip sleeve, which make it easier to pull the knife out of the grip sleeve. The grip sleeve itself is preferably formed from an essentially rectangular sheet metal blank and has mutually opposite engagement recesses for the blade holder.

Weitere Einzelheiten, Vorteile und erfindungswesentliche Merkmale ergeben sich aus der nachfolgenden Beschreibung einer bevorzugten Ausführungsform des erfindungsgemäßen Messers unter Bezugnahme auf die beigefügten Zeichnungen. Dabei zeigt im einzelnen:

  • Fig. 1 eine Seitenansicht des Messers in Ruheposition,
  • Fig. 2 eine der Fig. 1 entsprechende Darstellung des Messers in ausgefahrener Arbeitslage,
  • Fig. 3 einen Querschnitt durch das Messer entlang der Schnittlinie III-III der Fig. 1,
  • Fig. 4 eine Seitenansicht des Messers mit abgezogener Griffhülse und abgenommenem ersten Seitenteil der Klingenhalterung,
  • Fig. 5 eine Seitenansicht des ersten Seitenteils,
  • Fig. 6 eine der Fig. 4 entsprechende Darstellung mit aufgesetztem ersten Seitenteil der Klingenhalterung und
  • Fig. 7 eine Darstellung des Messers, teilweise im Schnitt in Klingenwechselposition.
Further details, advantages and features essential to the invention result from the following description of a preferred embodiment of the knife according to the invention with reference to the accompanying drawings. The individual shows:
  • 1 is a side view of the knife in the rest position,
  • 2 shows a representation of the knife corresponding to FIG. 1 in the extended working position,
  • 3 shows a cross section through the knife along the section line III-III of FIG. 1,
  • 4 is a side view of the knife with the grip sleeve removed and the first side part of the blade holder removed,
  • 5 is a side view of the first side part,
  • Fig. 6 is a representation corresponding to FIG. 4 with the first side part of the blade holder and
  • Fig. 7 is an illustration of the knife, partly in section in the blade change position.

Die Fig. 1 und 2 geben eine Seitenansicht des in seiner Gesamtheit mit der Bezugsziffer 10 versehenen Messers in Ruhestellung einerseits und in Arbeitsposition andererseits wieder.1 and 2 show a side view of the knife, provided in its entirety with the reference number 10, in the rest position on the one hand and in the working position on the other hand.

Vermittels eines nachfolgend noch im einzelnen zu erläuternden Aufbaus läßt sich die Klingenhalterung 11 mit der von dieser aufgenommenen Klinge 12 gegen den Zug einer Feder 31 aus der Griffhülse 13 ausfahren. Das Messer 10 befindet sich dann in der in Fig. 2 wiedergegebenen Arbeitsposition. Federkraft und Selbsthemmung lassen sich so einstellen, daß das Messer während des Schneidvorganges _ bedingt durch den der Federrückstellkraft entgegenwirkenden Schneidwiderstand _ in der Arbeitsposition verbleibt und sogleich nach Entlastung (Beenden der Schneidarbeit) in die Griffhülse 13 zurückschnellt, womit ein angenehmes Arbeiten und zugleich die angestrebte hohe Sicherheit gegen Verletzungen der Bedienungsperson gewährleistet ist.By means of a construction to be explained in more detail below, the blade holder 11 with the blade 12 received by it can be extended against the pull of a spring 31 out of the grip sleeve 13. The knife 10 is then in the working position shown in FIG. 2. The spring force and self-locking can be adjusted so that the knife remains in the working position during the cutting process due to the cutting resistance counteracting the spring restoring force, and snaps back into the grip sleeve 13 immediately after relieving the pressure (ending the cutting work), which makes working pleasant and at the same time the desired one high security against injuries to the operator is guaranteed.

Die Fig. 3 zeigt anhand einer Querschnittsdarstellung die Halterung der Klinge 12. Ein erstes und ein zweites Seitenelement 15 bzw. 16 schließen die Klinge 12 zwischen sich ein und stehen in formschlüssigem Eingriff miteinander. Am zweiten Seitenelement 16 vorgesehene Positioniervorsprünge 17 durchgreifen Bohrungen in der Klinge 12 und stehen mit entsprechenden Aussparungen im ersten Seitenelement 15 in Eingriff. Die beiden Seitenelemente 15 und 16 sind gleitend von der Griffhülse 13 aufgenommen.3 shows the holder of the blade 12 on the basis of a cross-sectional illustration. A first and a second side element 15 and 16 enclose the blade 12 between them and are in positive engagement with one another. Positioning projections 17 provided on the second side element 16 pass through bores in the blade 12 and engage with corresponding cutouts in the first side element 15. The two side elements 15 and 16 are slidably received by the grip sleeve 13.

Der Aufbau des Messers soll nachfolgend unter Bezugnahme auf die Fig. 4 und 5 näher erläutert werden:The structure of the knife will be explained in more detail below with reference to FIGS. 4 and 5:

Fig. 4 zeigt das Halte- und Führungselement 18, dessen Außenkontur im Bereich eines Hauptkörpers im wesentlichen den Innendimensionen der Griffhülse 13 entspricht, so daß es von dieser gegen Reibungswiderstand verschiebbar aufgenommen werden kann. Im rückwärtigen Bereich trägt das Halte- und Führungselement 18 eine Schulter 19, die sich am rückwärtigen Ende der Griffhülse 13 abstützt. Eingriffsmulden 20 erleichtern das Herausziehen des Elementes 18 zusammen mit der Klingenhalterung 11 aus der Griffhülse 13. Eine endseitige Bohrung 21 dient als Aufhängeöffnung oder zur Befestigung einer Schnur.Fig. 4 shows the holding and guiding element 18, the outer contour of which corresponds substantially to the inner dimensions of the grip sleeve 13 in the area of a main body, so that it can be slidably received by the latter against frictional resistance. In the rear area, the holding and guiding element 18 carries a shoulder 19 which is supported at the rear end of the grip sleeve 13. Engagement troughs 20 facilitate the pulling out of the element 18 together with the blade holder 11 from the grip sleeve 13. An end bore 21 serves as a suspension opening or for fastening a cord.

Im Hauptteil des Halte- und Führungselementes 18 sind außermittig zwei einander parallele längsaxiale Führungsnuten 22 und 23 ausgebildet. Die Führungsnuten 22 und 23 nehmen frei vorragende Führungsrippen 24 bzw. 25 des ersten Seitenelementes 15 der Klingenhalterung 11 gleitend auf. Die Führungsrippe 24 trägt endseitig einen Anschlag 26, der in eine nutbodenseitige längliche Durchbrechung 27 am rückwärtigen Ende der Führungsnut 22 eingreift. Dieser Eingriff stellt eine Bewegungsbegrenzung für die anhand der Fig. 1 und 2 oben erläuterten Verschiebung der Klingenhalterung 11 zwischen Ruhe- und Arbeitsposition dar.In the main part of the holding and guiding element 18, two mutually parallel ones are off-center longitudinal axial guide grooves 22 and 23 are formed. The guide grooves 22 and 23 slide freely projecting guide ribs 24 and 25 of the first side element 15 of the blade holder 11. The guide rib 24 carries at the end a stop 26 which engages in an elongated opening 27 on the groove bottom side at the rear end of the guide groove 22. This intervention represents a movement limitation for the displacement of the blade holder 11 between the rest position and the working position explained above with reference to FIGS. 1 and 2.

Die gegenüberliegende Führungsnut 23 des Elementes 18 trägt endseitig im Nutboden ebenfalls eine längliche, jedoch etwas kürzere Durchbrechung 28. Die Durchbrechung 28 vermag das Ende der Führungsrippe 25 aufzunehmen, wenn das Seitenelement 15 aufgeklappt wird, wie dies später unter Bezugnahme auf Fig. 7 noch näher zu erläutern sein wird.The opposite guide groove 23 of the element 18 also has an elongated but somewhat shorter opening 28 in the bottom of the groove. The opening 28 is able to receive the end of the guide rib 25 when the side element 15 is opened, as will be explained in more detail later with reference to FIG. 7 will have to be explained.

Das Halte- und Führungselement 18 ist außerdem in Verschieberichtung der Klingenhalterung 11 mit einer mittigen Längsnut 29 versehen, die an ihrem rückwärtigen Ende einen Haltevorsprung 30 für die Zugfeder 31 trägt. Die Zugfeder 31 wird von der Längsnut 29 aufgenommen.The holding and guiding element 18 is also provided in the direction of displacement of the blade holder 11 with a central longitudinal groove 29 which carries a holding projection 30 for the tension spring 31 at its rear end. The tension spring 31 is received by the longitudinal groove 29.

Das gegenüberliegende Ende der Zugfeder 31 ist an einem Vorsprung 32 gehalten, der von einer Lasche 33 getragen ist, die sich mittig auf der dem Halte- und Führungselement 18 zugewandten Seite des zweiten Seitenelementes 16 befindet. In einer entsprechenden Lasche 34 des gegenüberliegenden Seitenelementes 15 befindet sich eine Aussparung 35, die in montiertem Zustand des Messers einen axialen Überstand des Vorsprungs 32 des Seitenelementes 16 umgreift so daß dem Auge der Zugfeder 31 ein sicherer Halt geboten wird.The opposite end of the tension spring 31 is held on a projection 32 which is carried by a tab 33 which is centered on the holding and guiding element 18 Side of the second side element 16 is located. In a corresponding tab 34 of the opposite side element 15 there is a recess 35 which, in the assembled state of the knife, engages around an axial projection of the projection 32 of the side element 16 so that the eye of the tension spring 31 is offered a secure hold.

Das zweite Seitenelement 16 trägt eine etwas außermittige Längsvertiefung zur Aufnahme der Klinge 12. Bereits im Zusammenhang mit Fig. 3 erwähnte Positionsvorsprünge 17 des Seitenelementes 16 durchgreifen entsprechende Durchbrechungen der Klinge 12 und werden von Aussparungen 35 des ersten Seitenelementes 15 übergriffen. Das Seitenelement 15 ist mit einem außermittigen Längsvorsprung versehen, der in die Längsaussparung des gegenüberliegenden Seitenelementes 16 eingreift, so daß die Klinge 12 formschlüssig gehalten und gesichert ist. Beide Seitenelemente 15 und 16 tragen an einer vorderen Ecke jeweils eine Abschrägung 36 und 37, über welche die Schneidkante 44 der Klinge 12 hinausragt, so daß sie mit dem zu bearbeitenden Material zum Eingriff bringbar ist.The second side element 16 carries a somewhat eccentric longitudinal recess for receiving the blade 12. Position projections 17 of the side element 16 already mentioned in connection with FIG. 3 pass through corresponding openings in the blade 12 and are overlapped by recesses 35 in the first side element 15. The side element 15 is provided with an eccentric longitudinal projection which engages in the longitudinal recess of the opposite side element 16, so that the blade 12 is held and secured in a form-fitting manner. Both side elements 15 and 16 each have a bevel 36 and 37 at a front corner, beyond which the cutting edge 44 of the blade 12 protrudes, so that it can be brought into engagement with the material to be processed.

Wie aus Fig. 4 deutlich wird, trägt das zweite Seitenelement 16 auf der dem Halte- und Führungselement 18 zugewandten Seite Paßstifte 39 und 38 in Bewegungsrichtung x (längsaxiale Richtung), die in entsprechende, im Halte- und Führungselement 18 eingebrachte Bohrungen 40 und 41 eingreifen. Hierdurch und durch den Zug der Feder 31 wird das zweite Seitenelement 16 auch bei abgenommenem ersten Seitenelement 15 zum Auswechseln der Klinge 12 an dem Halte- und Führungselement 18 fixiert, d.h. auch gegen ein Abkippen unter Wirkung der Zugfeder 31 gesichert.As is clear from FIG. 4, the second side element 16 carries dowel pins 39 and 38 in the direction of movement x (longitudinal axial direction) on the side facing the holding and guiding element 18, which bores 40 and 41 are made in corresponding holes in the holding and guiding element 18 intervention. As a result and by the tension of the spring 31, the second side element 16 is fixed to the holding and guiding element 18, even when the first side element 15 is removed, in order to replace the blade 12, ie it is also secured against tipping under the action of the tension spring 31.

Die Fig. 6 zeigt das Halte- und Führungselement 18 mit eingesetzter Zugfeder 31 sowie mit aufgesetztem Seitenelement 15. Die Klinge 12 wird nunmehr zwischen den beiden Seitenelementen 15 und 16 eingeschlossen. Auf der Außenfläche tragen die beiden Seitenelemente 15 und 16 Profilierungen 42 zur Verbesserung des Eingriffes bei Betätigung des Messers 10.6 shows the holding and guiding element 18 with the tension spring 31 inserted and with the side element 15 attached. The blade 12 is now enclosed between the two side elements 15 and 16. On the outer surface, the two side elements 15 and 16 carry profilings 42 to improve the engagement when the knife 10 is actuated.

Die Griffhülse 13 ist aus einem im wesentlichen rechteckförmigen Blechrohling durch entsprechende Abkantungen gebildet. Sie trägt, wie aus den Fig. 1 und 2 deutlich wird, seitlich im Bereich der Klingenhalterung 11 einander gegenüberliegende Eingriffsaussparungen 43, durch welche die Profilierung 42 der Klingenhalterung 11 ergriffen werden kann. Die Griffhülse 13 kann mit einer Lackschicht oder beliebig gestaltetem Aufdruck versehen sein.The grip sleeve 13 is formed from a substantially rectangular sheet metal blank by means of appropriate bevels. As is clear from FIGS. 1 and 2, it bears mutually opposite engagement recesses 43 in the area of the blade holder 11, through which the profiling 42 of the blade holder 11 can be gripped. The grip sleeve 13 can be provided with a layer of lacquer or any desired design.

Die Fig. 7 zeigt das Halte- und Führungselement 18 mit ausgeschwenktem Seitenelement 15 zum Auswechseln der Klinge 12. Das äußere Ende der Führungsrippe 25 sowie entsprechend das hier nicht sichtbare Ende der Führungsrippe 24 durchgreifen die Durchbrechungen 27 bzw. 29 in den Führungsnuten 22 bzw. 23 des Halte- und Führungselementes 18. Hierdurch wird das Seitenelement 15 während des Klingenwechselvorganges gehalten, so daß es nicht abgelegt zu werden braucht. Nach vollzogenem Klingenwechsel wird das Seitenelement 15 wieder zurückgeschwenkt und legt sich praktisch zwangsläufig, die Klinge 12 einschließend, auf das zweite Seitenelement 16 auf, indem die Aussparung 35 den Haltevorsprung 32 für das korrespondierende Federauge der Zugfeder 31 umgreift.FIG. 7 shows the holding and guiding element 18 with the side element 15 pivoted out for exchanging the blade 12. The outer end of the guiding rib 25 and correspondingly the end of the guiding rib 24 which is not visible here penetrate through the openings 27 and 29 in FIG Guide grooves 22 and 23 of the holding and guiding element 18. As a result, the side element 15 is held during the blade changing process, so that it does not need to be put down. After the blade has been changed, the side element 15 is pivoted back again and practically inevitably, including the blade 12, lies on the second side element 16 by the recess 35 engaging around the retaining projection 32 for the corresponding spring eye of the tension spring 31.

Es soll an dieser Stelle noch einmal ausdrücklich angeführt werden. daß es sich bei der vorangehenden Beschreibung lediglich um eine solche beispielhaften Charakters handelt.At this point it should be explicitly mentioned again. that it is only such an exemplary character in the preceding description.

Claims (10)

1. Knife with a hollow handle body (13), in which a stationary holding and guiding element (18) is housed, which projects out of the end of the handle body (13), in which a blade mounting (11) is also housed displaceably relative to the handle body and is connected via a tension spring (31) to the stationary holding and guiding element (18), characterised in that the handle body is formed as a substantially rectangular handle sleeve (13) and has on its end near the blade and remote from the holding and guiding element (18) engaging recesses (43), into which the blade mounting (11), consisting of two side elements (15, 16) enclosing the blade (12), projects.
2. Knife according to claim 1, characterised in that the first side element (15) has two guide ribs (24, 25) which are received by two guide grooves (22, 23) inside the stationary holding and guiding element (18).
3. Knife according to claim 2, characterised in that the first guide rib (24) has at its end a stop (26), which engages in a longitudinal aperture (27) inside the stationary holding and guiding element (18).
4. Knife according to one of the preceding claims, characterised in that the second guide groove (23) opens at the end in an aperture (28) of the holding and guiding element (18).
5. Knife according to one of the preceding claims, characterised in that the second side element (16) of the blade mounting (11) has dowel pins (38, 39) in the displacement direction (x), which engage in corresponding bores (40, 41) in the stationary holding and guiding element (18).
6. Knife according to claim 5, characterised in that the dowel pins (38, 39) and the bores (40, 41) are shorter than the guide ribs (24, 25) and the guide grooves (22, 23).
7. Knife according to one of the preceding claims, characterised in that the first side element (16) has a holding projection (32) mounted on a projecting plate (33) for the tension spring (31), which is mounted in a longitudinal groove (29) of the stationary holding and guiding element (18), in which at the end the opposite holding projection (30) for the tension spring (31) is located.
8. Knife according to claim 7, characterised in that the holding projection (32) is covered by a recess (35) of a plate (34) provided correspondingly on the opposite side element (15).
9. Knife according to one of the preceding claims, characterised in that the side elements (15, 16) have external profiling (42).
10. Knife according to one of the preceding claims, characterised in that the handle sleeve (13) is formed of a substantially rectangular sheet-metal blank.
EP88114440A 1987-10-31 1988-09-05 Cardboard safety cutter Expired - Lifetime EP0314894B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88114440T ATE62439T1 (en) 1987-10-31 1988-09-05 SAFETY CARTON KNIFE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873736968 DE3736968A1 (en) 1987-10-31 1987-10-31 SECURITY CARTON KNIFE
DE3736968 1987-10-31

Publications (2)

Publication Number Publication Date
EP0314894A1 EP0314894A1 (en) 1989-05-10
EP0314894B1 true EP0314894B1 (en) 1991-04-10

Family

ID=6339503

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Application Number Title Priority Date Filing Date
EP88114440A Expired - Lifetime EP0314894B1 (en) 1987-10-31 1988-09-05 Cardboard safety cutter

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US (1) US4899443A (en)
EP (1) EP0314894B1 (en)
AT (1) ATE62439T1 (en)
DE (2) DE3736968A1 (en)
ES (1) ES2022560B3 (en)
HK (1) HK93292A (en)
SG (1) SG82892G (en)

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Also Published As

Publication number Publication date
DE3736968A1 (en) 1989-05-18
ES2022560B3 (en) 1991-12-01
ATE62439T1 (en) 1991-04-15
DE3862367D1 (en) 1991-05-16
US4899443A (en) 1990-02-13
DE3736968C2 (en) 1989-11-23
EP0314894A1 (en) 1989-05-10
SG82892G (en) 1992-12-04
HK93292A (en) 1992-12-04

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