EP1328379B1 - Knife-sharpening machine - Google Patents

Knife-sharpening machine Download PDF

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Publication number
EP1328379B1
EP1328379B1 EP01988641A EP01988641A EP1328379B1 EP 1328379 B1 EP1328379 B1 EP 1328379B1 EP 01988641 A EP01988641 A EP 01988641A EP 01988641 A EP01988641 A EP 01988641A EP 1328379 B1 EP1328379 B1 EP 1328379B1
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EP
European Patent Office
Prior art keywords
sharpening
knife
slot
rods
plate
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EP01988641A
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German (de)
French (fr)
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EP1328379A1 (en
Inventor
Alois Spreitz
Harald Stallegger
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
    • B24D15/06—Hand tools or other devices for non-rotary grinding, polishing, or stropping specially designed for sharpening cutting edges
    • B24D15/08—Hand tools or other devices for non-rotary grinding, polishing, or stropping specially designed for sharpening cutting edges of knives; of razors
    • B24D15/081—Hand tools or other devices for non-rotary grinding, polishing, or stropping specially designed for sharpening cutting edges of knives; of razors with sharpening elements in interengaging or in mutual contact

Definitions

  • the invention relates to a knife sharpening device according to the preamble of claim 1.
  • Such a device is already known from US-A-5,478,272.
  • the Wetzstäbe consist of steel.
  • the springs, which pivot the Wetzstäbe each other, are formed by coil springs, which act on the axes of rotation of the Wetzstäbe.
  • the grinding performance of the known device leaves much to be desired.
  • the known device is difficult to clean because when sharpening dirty knife liquid cutting material can get into the range of axes of rotation with the coil springs.
  • the object of the invention is to significantly improve the known device in terms of grinding performance and hygiene.
  • Wetzstäbe be used, which consist of ceramic in the grinding area.
  • oxides, carbides, borides, nitrides or silicides of metals or of the non-metals can be used as ceramic materials, for example silicon carbide or metal oxides, carbides, borides, nitrides or silicides, in particular of tungsten, titanium, niobium or tantalum, for example tungsten carbide.
  • These metal compounds are also referred to as hard metals.
  • the Wetzstäbe be performed according to the invention at the ends remote from their axes in guides, which are formed with a radius corresponding to the length of the Wetzstäbe circular arc.
  • the two Wetzstäbe according to the invention preferably at least in the grinding region on a rectangular cross-section, wherein the mutually facing sides of the two rectangles parallel to each other.
  • the knife touches the full width of the two Wetzstäbe during grinding. That is, with a width of Wetzstäbe of, for example, 0.5 to 1 cm, the knife during grinding with the Wetzstäben over a length of 1 to 2 cm in contact.
  • the ceramic material in the grinding area can also be formed by an insert in the Wetzstäbe.
  • both wedge bars preferably have, in the closed end region of the slot, on the sides facing each other a section which tapers towards the axis of rotation of the wedge bars.
  • These tapered sections can be formed for example by constrictions of the Wetzstäbe in this area.
  • the Wetzstäbe are each attached to a pin which is rotatably mounted on the plate.
  • the springs which pivot the Wetzstäbe each other, may be formed by spring bars which extend on either side of the slot and are fixed at one end to the pin and at the other end on the same slot side on the holder.
  • the springs are thus easily accessible from the outside and easy to clean.
  • the spring bars may be formed for example by a leaf spring or by a spring wire.
  • the arcuate guides for the Wetzstäbe are formed by arcuate slots in the plate.
  • the Wetzstäbe at their ends remote from their axes of rotation each have a further pin on which a reduced diameter portion is provided, which engages in the relevant guide slot.
  • the pivots for rotatably supporting the sharpening rods may also have a reduced diameter portion which engages a bore of the plate.
  • the pins for rotatable mounting and / or the other pins for guiding the Wetzstäbe made of plastic and are provided with recordings in which the ends of the Wetzstäbe are inserted. The inserted in the plastic pins Wetzstäbe are thus stored soft.
  • the recordings have a cross section corresponding to the Wetzstäben, so are also rectangular in a rectangular cross section of the Wetzstäbe.
  • a connectable with the respective pin or other pin counterpart is provided, which has a larger diameter compared to the portion of reduced diameter.
  • a plug or snap connection may be provided to connect the counterpart with the pin or other pin.
  • the connection is formed by a screw connection.
  • This can, for. B. be configured so that the counterpart is designed as a screw which is screwed into an internal thread, which is provided in the portion of the (further) pin with a reduced diameter.
  • the counterpart can be formed as a nut, which is screwed onto a screw thread, which is provided at the portion of the (further) pin with reduced diameter.
  • All four pins and all four counterparts for the storage and management of Wetzstäbe can be the same design, wherein, since the Wetzstäbe are offset from the holder or support plate, the distance of the recordings of the support plate at the two pins that the to the Record plate staggered Wetzstab, smaller than the other two cones.
  • the device has on a plate-shaped base 1 a retaining plate 3 fastened with screws 2.
  • the holding plate 3 On the holding plate 3 are two intersecting Wetzstäbe 4, 5 with the plate 3 perpendicular axes 6, 7 rotatably mounted.
  • the holding plate 3 has in the middle a vertical slot 8, which is open at its upper end 9, which is funnel-shaped upward, and closed at its lower end 10.
  • the lower end 10 is located above the two axes of rotation 6, 7, which lie on one side or the other of the vertical with the slot 8.
  • the Wetzstäbe 4, 5 can cross, they are offset from the plate 3. That is, the rod 5 is arranged closer to the plate 3 than the rod 4.
  • the Wetzstäbe 4, 5, which extend parallel to the holding plate 3, are made of ceramic, for example silicon carbide. At their facing away from the axes of rotation 6, 7 upper end of the Wetzstäbe 4, 5 in arcuate slots 12, 13 in the holding plate 3 out, which extend on one side or the other of the slot 8.
  • the Wetzstäbe 4, 5 are fixed to a pin 14, 15, which is rotatably mounted on the support plate 3.
  • the ends of the Wetzstäbe 4, 5 are loaded according to the arrows 16, 17 by spring rods 18, 19 to each other, which run on either side of the slot 8 and with one end against rotation of the pin 14, 15 and bent at its other end and into corresponding holes the holding plate 3 are inserted.
  • the two ceramic rods 4, 5 have a square or rectangular cross section, with the mutually facing sides a, b of the two rectangles running parallel to one another. But it is also a triangular cross-section conceivable, in which case the mutually facing sides of the two triangles are parallel or generally in a polygonal cross-section of the Wetzstäbe 4, 5, the two mutually facing sides of the two referenceecke.
  • the Wetzstäbe 4, 5 are worn by sharpening the knife over time. In this case, a step can form in the lower end region 10 of the slot 8 over time. In order to prevent the formation of such steps, the Wetzstäbe 4, 5 are tapered in this area and by constrictions 23, 24th
  • the Wetzstäbe 4, 5 have for guiding in the arcuate slots 12, 13 at its upper end further pins 25, 26 which are provided with a reduced diameter portion 27 which engages in the guide slot 12, 13.
  • the pins 14, 15 on the axes of rotation 6, 7 on a reduced diameter portion which engages in a bore 31, 32 in the holding plate 3.
  • the pins 14, 15 and the other pins 25, 26 are made of plastic. Since the pins 14, 15 and the other pins 25, 26 are identical, only the pin 14 is shown in Figure 4.
  • the pin 14 is provided with rectangular bag-shaped receptacles 33, 34 into which one end of the Wetzstabes 4 and 5 is inserted. In the fine blind bore 35 of the pin 14, the end of the spring rods 18, 19 is inserted. Through the holes 37, 38 moisture can escape from the receptacles 33, 34.
  • the reduced diameter portion 27 has an internal thread 40 into which the cap screw 42 is screwed as a counterpart. The unused receptacle 33 or 34 can be
  • the plate 3 has lateral recesses 41, 42.
  • the Wetzstäbe 4, 5 on its outer side in each case a dashed lines, arcuate plate 44, 45, for example made of plastic as finger protection, which are parallel to the support plate 3 and axially offset. Furthermore, shown in dashed lines in Fig. 1 inserts 46, 47 in the grinding region of the Wetzstäbe 4, 5, which consist of ceramic. If such ceramic inserts 46, 47 are used, the constrictions 23, 24 can be dispensed with. Apart from the inserts 46, 47 then the Wetzstäbe 4, 5, for example, consist of plastic. It is also possible, the Wetzstäbe 4, 5 then integrally with the finger protection plates 44, 45 form.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)

Abstract

The invention relates to a knife sharpening machine comprising a plate-type holding device on which two intersecting sharpening bars are rotationally mounted and loaded in relation to each other by means of springs. The sharpening bars, at least in the grinding area, are made of a ceramic material. The plate is provided with a slit which is open on one end and closed on the other, extending as far as the intersection point of the sharpening bars. When pressure is exerted by the knife in the direction of the closed slit end, the sharpening bars are spread apart from each other counter to the force of the springs. Curved guides are provided on both sides of the slit. The ends of the sharpening bars, facing away from the axes of rotation thereof, are guided therein.

Description

Die Erfindung bezieht sich auf eine Messerschärfvorrichtung nach dem Oberbegriff des Anspruchs 1.The invention relates to a knife sharpening device according to the preamble of claim 1.

Eine derartige Vorrichtung ist aus US-A-5,478,272 bereits bekannt. Die Wetzstäbe bestehen dabei aus Stahl. Die Federn, die die Wetzstäbe aufeinander zu verschwenken, werden durch Spiralfedern gebildet, die an den Drehachsen der Wetzstäbe angreifen. Die Schleifleistung der bekannten Vorrichtung läßt noch zu wünschen übrig. Auch ist die bekannte Vorrichtung schwierig zu reinigen, da beim Schärfen unsauberer Messer flüssiges Schneidgut in den Bereich der Drehachsen mit den Spiralfedern gelangen kann.Such a device is already known from US-A-5,478,272. The Wetzstäbe consist of steel. The springs, which pivot the Wetzstäbe each other, are formed by coil springs, which act on the axes of rotation of the Wetzstäbe. The grinding performance of the known device leaves much to be desired. Also, the known device is difficult to clean because when sharpening dirty knife liquid cutting material can get into the range of axes of rotation with the coil springs.

Aus US-A-2,435,672 geht eine Messerschärfvorrichtung mit zwei sich kreuzenden Wetzstäben hervor, die jeweils mit einem Bügel gehalten und verschiebbar geführt werden. Die Wetzstäbe weisen einen rechteckigen Querschnitt auf und bestehen aus Schleifkörnern mit einem Bindemittel. Aus GB 412,056 ist es bekannt, einen Bedienungsknopf, mit dem zwei Hebel mit einem Wetzelement aus einem Wetzstein hin- und herbewegt werden, um beide Schneiden einer Rasierklinge zu schärfen, in einer bogenförmigen Führung im Gehäuse zu führen.From US-A-2,435,672 a knife sharpening device with two intersecting Wetzstäben shows, which are held in each case with a bracket and slidably guided. The Wetzstäbe have a rectangular cross section and consist of abrasive grains with a binder. From GB 412,056 it is known to guide a control knob, with which two levers are moved back and forth with a waving element from a whetstone to sharpen both edges of a razor blade, in an arcuate guide in the housing.

Aufgabe der Erfindung ist es, die bekannte Vorrichtung hinsichtlich der Schleifleistung und Hygiene entscheidend zu verbessern.The object of the invention is to significantly improve the known device in terms of grinding performance and hygiene.

Dies wird erfindungsgemäß durch die im Anspruch 1 angegebenen Maßnahmen erreicht.This is inventively achieved by the measures specified in claim 1.

Erfindungsgemäß werden also Wetzstäbe verwendet, die im Schleifbereich aus Keramik bestehen. Dadurch wird eine hohe Schleifleistung erzielt. Als keramische Werkstoffe können insbesondere Oxide, Carbide, Boride, Nitride oder Silizide von Metallen oder der Nichtmetalle untereinander eingesetzt werden, beispielsweise Siliziumcarbid oder Metalloxide, -carbide, -boride, -nitride oder -silicide insbesondere von Wolfram, Titan, Niob oder Tantal, beispielsweise Wolframkarbid. Diese Metallverbindungen werden auch als Hartmetalle bezeichnet. Da Keramikstäbe nur einer geringen Biegebeanspruchung standhalten, werden die Wetzstäbe erfindungsgemäß an den von ihren Drehachsen abgewandten Enden in Führungen geführt, die mit einem der Länge der Wetzstäbe entsprechenden Radius kreisbogenförmig ausgebildet sind.According to the invention therefore Wetzstäbe be used, which consist of ceramic in the grinding area. This achieves a high grinding performance. In particular, oxides, carbides, borides, nitrides or silicides of metals or of the non-metals can be used as ceramic materials, for example silicon carbide or metal oxides, carbides, borides, nitrides or silicides, in particular of tungsten, titanium, niobium or tantalum, for example tungsten carbide. These metal compounds are also referred to as hard metals. Since ceramic rods withstand only a small bending stress, the Wetzstäbe be performed according to the invention at the ends remote from their axes in guides, which are formed with a radius corresponding to the length of the Wetzstäbe circular arc.

Um durch eine lange Schleiffläche die Schleifzeit zu verkürzen, weisen die beiden Wetzstäbe erfindungsgemäß zumindest im Schleifbereich vorzugsweise einen rechteckigen Querschnitt auf, wobei die einander zugewandten Seiten der beiden Rechtecke parallel zueinander verlaufen. Damit berührt das Messer beim Schleifen die volle Breite der beiden Wetzstäbe. Das heißt, bei einer Breite der Wetzstäbe von beispielsweise 0,5 bis 1 cm steht das Messer beim Schleifen mit den Wetzstäben über eine Länge von 1 bis 2 cm in Kontakt.In order to shorten the grinding time by a long grinding surface, the two Wetzstäbe according to the invention preferably at least in the grinding region on a rectangular cross-section, wherein the mutually facing sides of the two rectangles parallel to each other. Thus, the knife touches the full width of the two Wetzstäbe during grinding. That is, with a width of Wetzstäbe of, for example, 0.5 to 1 cm, the knife during grinding with the Wetzstäben over a length of 1 to 2 cm in contact.

Das keramische Material im Schleifbereich kann auch durch einen Einsatz in die Wetzstäbe gebildet sein.The ceramic material in the grinding area can also be formed by an insert in the Wetzstäbe.

Durch das Schärfen der Messer wird das Material über die Länge der Wetzstäbe im wesentlichen gleichmäßig abgetragen. Dies gilt jedoch nicht für den Abschnitt der Wetzstäbe am geschlossenen Endbereich des Schlitzes. Hier bildet sich vielmehr mit der Zeit eine Stufe in den Keramikstäben aus, die statt zum Schärfen zum Stumpfwerden des Messers beim Schleifen führen kann.By sharpening the knives, the material is removed substantially uniformly over the length of the Wetzstäbe. However, this does not apply to the section of the whetsticks at the closed end portion of the slot. Rather, a step in the ceramic rods is formed over time which, instead of sharpening, can lead to dulling of the knife during grinding.

Um dem zu begegnen, weisen erfindungsgemäß beide Wetzstäbe vorzugsweise im geschlossenen Endbereich des Schlitzes an den einander zugewandten Seiten einen Abschnitt auf, der sich zur Drehachse der Wetzstäbe hin verjüngt. Diese sich verjüngenden Abschnitte können beispielsweise durch Einschnürungen der Wetzstäbe in diesem Bereich gebildet sein.In order to counteract this, according to the invention, both wedge bars preferably have, in the closed end region of the slot, on the sides facing each other a section which tapers towards the axis of rotation of the wedge bars. These tapered sections can be formed for example by constrictions of the Wetzstäbe in this area.

Die Wetzstäbe sind jeweils an einem Zapfen befestigt, der an der Platte drehbar gelagert ist.The Wetzstäbe are each attached to a pin which is rotatably mounted on the plate.

Die Federn, die die Wetzstäbe aufeinander zu verschwenken, können durch Federstäbe gebildet sein, die beiderseits des Schlitzes verlaufen und mit ihrem einen Ende drehfest an dem Zapfen und mit dem anderen Ende auf der gleichen Schlitzseite an der Halterung befestigt sind. Die Federn sind damit von außen gut zugänglich und leicht zu reinigen. Die Federstäbe können beispielsweise durch eine Blattfeder oder durch einen Federdraht gebildet sein.The springs, which pivot the Wetzstäbe each other, may be formed by spring bars which extend on either side of the slot and are fixed at one end to the pin and at the other end on the same slot side on the holder. The springs are thus easily accessible from the outside and easy to clean. The spring bars may be formed for example by a leaf spring or by a spring wire.

Die bogenförmigen Führungen für die Wetzstäbe werden durch bogenförmige Schlitze in der Platte gebildet . Zur Führung in den bogenförmigen Führungen der Platte weisen die Wetzstäbe an ihren von ihren Drehachsen abgewandten Enden jeweils einen weiteren Zapfen auf, an dem ein Abschnitt mit reduziertem Durchmesser vorgesehen ist, der in den betreffenden Führungsschlitz eingreift.The arcuate guides for the Wetzstäbe are formed by arcuate slots in the plate. To guide in the arcuate guides of the plate, the Wetzstäbe at their ends remote from their axes of rotation each have a further pin on which a reduced diameter portion is provided, which engages in the relevant guide slot.

Die Zapfen zur drehbaren Lagerung der Wetzstäbe können ebenfalls einen Abschnitt mit reduziertem Durchmesser aufweisen, der in eine Bohrung der Platte eingreift. Die Zapfen zur drehbaren Lagerung und/oder die weiteren Zapfen zur Führung der Wetzstäbe bestehen aus Kunststoff und sind mit Aufnahmen versehen, in die die Enden der Wetzstäbe gesteckt sind. Die in die Kunststoffzapfen gesteckten Wetzstäbe sind damit weich gelagert. Die Aufnahmen besitzen dabei einen den Wetzstäben entsprechenden Querschnitt, sind also bei einem rechteckigen Querschnitt der Wetzstäbe ebenfalls rechteckig.The pivots for rotatably supporting the sharpening rods may also have a reduced diameter portion which engages a bore of the plate. The pins for rotatable mounting and / or the other pins for guiding the Wetzstäbe made of plastic and are provided with recordings in which the ends of the Wetzstäbe are inserted. The inserted in the plastic pins Wetzstäbe are thus stored soft. The recordings have a cross section corresponding to the Wetzstäben, so are also rectangular in a rectangular cross section of the Wetzstäbe.

Auf der anderen Seite der Platte ist ein mit dem jeweiligen Zapfen bzw. weiteren Zapfen verbindbares Gegenstück vorgesehen, das einen gegenüber dem Abschnitt mit reduziertem Durchmesser größeren Durchmesser aufweist. Zur Verbindung des Gegenstücks mit dem Zapfen bzw. weiteren Zapfen kann beispielsweise eine Steck- oder Schnappverbindung vorgesehen sein. Vorzugsweise wird die Verbindung jedoch durch eine Schraubverbindung gebildet. Diese kann z. B. so ausgestaltet sein, dass das Gegenstück als Schraube ausgebildet ist, die in ein Innengewinde geschraubt wird, das in dem Abschnitt des (weiteren) Zapfens mit reduziertem Durchmesser vorgesehen ist. Umgekehrt kann das Gegenstück als Mutter ausgebildet sein, welche auf ein Schraubgewinde geschraubt wird, das an dem Abschnitt des (weiteren) Zapfens mit reduziertem Durchmesser vorgesehen ist.On the other side of the plate a connectable with the respective pin or other pin counterpart is provided, which has a larger diameter compared to the portion of reduced diameter. To connect the counterpart with the pin or other pin, for example, a plug or snap connection may be provided. Preferably, however, the connection is formed by a screw connection. This can, for. B. be configured so that the counterpart is designed as a screw which is screwed into an internal thread, which is provided in the portion of the (further) pin with a reduced diameter. Conversely, the counterpart can be formed as a nut, which is screwed onto a screw thread, which is provided at the portion of the (further) pin with reduced diameter.

Alle vier Zapfen und alle vier Gegenstücke für die Lagerung und Führung der Wetzstäbe können dabei gleich ausgebildet sein, wobei, da die Wetzstäbe gegenüber der Halterung bzw. Halterungsplatte versetzt sind, der Abstand der Aufnahmen von der Halterungsplatte bei den beiden Zapfen, die den zu der Platte hin versetzten Wetzstab aufnehmen, kleiner ist als bei den beiden anderen Zapfen.All four pins and all four counterparts for the storage and management of Wetzstäbe can be the same design, wherein, since the Wetzstäbe are offset from the holder or support plate, the distance of the recordings of the support plate at the two pins that the to the Record plate staggered Wetzstab, smaller than the other two cones.

An der von der Schleiffläche abgewandten Außenseite der Wetzstäbe ist an jedem Wetzstab ein plattenförmiger Fingerschutz angebracht, durch den verhindert wird, dass man mit der Hand mit dem Messer in Berührung kommt, wenn die Halterung beim Schleifen mit der Hand gehalten wird.On the outside of the Wetzstäbe facing away from the grinding surface of each Wetzstab a plate-shaped finger guard is attached, is prevented by the fact that one comes by hand with the knife into contact when the holder is held during grinding by hand.

Nachstehend ist eine Ausführungsform der erfindungsgemäßen Messerschleifvorrichtung anhand der Zeichnung beispielshaft näher erläutert. Darin zeigen:

Fig. 1 und Fig. 2
eine Vorder- bzw. Seitenansicht der erfindungsgemäßen Vorrichtung;
Fig. 3
einen Schnitt entlang der Linie III-III in Figur 2; und
Fig. 4
einen Schnitt durch einen auf ein Wetzstabende steckbaren Zapfen zur Lagerung oder Führung des Wetzstabes mit Gegenstück.
An embodiment of the knife sharpening device according to the invention is explained in more detail by way of example with reference to the drawing. Show:
Fig. 1 and Fig. 2
a front or side view of the device according to the invention;
Fig. 3
a section along the line III-III in Figure 2; and
Fig. 4
a section through a plug on a Wetzstabende plug for storage or management of the Wetzstabes with counterpart.

Gemäß Figur 1 und 2 weist die Vorrichtung auf einem plattenförmigen Sockel 1 eine mit Schrauben 2 befestigte Halteplatte 3 auf.According to FIGS. 1 and 2, the device has on a plate-shaped base 1 a retaining plate 3 fastened with screws 2.

An der Halteplatte 3 sind zwei sich kreuzende Wetzstäbe 4, 5 mit zur Platte 3 senkrecht verlaufenden Achsen 6, 7 drehbar gelagert. Die Halteplatte 3 weist in der Mitte einen senkrechten Schlitz 8 auf, der an seinem oberen Ende 9, das nach oben trichterförmig erweitert ist, offen und an seinem unteren Ende 10 geschlossen ist. Das untere Ende 10 befindet sich oberhalb der beiden Drehachsen 6, 7, die auf der einen bzw. anderen Seite der Senkrechten mit dem Schlitz 8 liegen.On the holding plate 3 are two intersecting Wetzstäbe 4, 5 with the plate 3 perpendicular axes 6, 7 rotatably mounted. The holding plate 3 has in the middle a vertical slot 8, which is open at its upper end 9, which is funnel-shaped upward, and closed at its lower end 10. The lower end 10 is located above the two axes of rotation 6, 7, which lie on one side or the other of the vertical with the slot 8.

Damit sich die Wetzstäbe 4, 5 kreuzen können, sind sie gegenüber der Platte 3 versetzt angeordnet. Das heißt, der Stab 5 ist näher an der Platte 3 angeordnet als der Stab 4. Die Wetzstäbe 4, 5, die parallel zur Halteplatte 3 verlaufen, bestehen aus Keramik, beispielsweise Siliziumcarbid. An ihren von den Drehachsen 6, 7 abgewandten oberen Ende sind die Wetzstäbe 4, 5 in bogenförmigen Schlitzen 12, 13 in der Halteplatte 3 geführt, die auf der einen bzw. anderen Seite des Schlitzes 8 verlaufen.Thus, the Wetzstäbe 4, 5 can cross, they are offset from the plate 3. That is, the rod 5 is arranged closer to the plate 3 than the rod 4. The Wetzstäbe 4, 5, which extend parallel to the holding plate 3, are made of ceramic, for example silicon carbide. At their facing away from the axes of rotation 6, 7 upper end of the Wetzstäbe 4, 5 in arcuate slots 12, 13 in the holding plate 3 out, which extend on one side or the other of the slot 8.

Die Wetzstäbe 4, 5 sind an einem Zapfen 14, 15 befestigt, der an der Halteplatte 3 drehbar gelagert ist. Die Enden der Wetzstäbe 4, 5 sind entsprechend den Pfeilen 16, 17 durch Federstäbe 18, 19 aufeinander zu belastet, die beiderseits des Schlitzes 8 verlaufen und mit einem Ende drehfest an dem Zapfen 14, 15 und an ihrem anderen Ende abgewinkelt und in entsprechende Bohrungen der Halteplatte 3 gesteckt sind.The Wetzstäbe 4, 5 are fixed to a pin 14, 15, which is rotatably mounted on the support plate 3. The ends of the Wetzstäbe 4, 5 are loaded according to the arrows 16, 17 by spring rods 18, 19 to each other, which run on either side of the slot 8 and with one end against rotation of the pin 14, 15 and bent at its other end and into corresponding holes the holding plate 3 are inserted.

Der Schlitz 8, der zur Aufnahme und Führung eines Messers mit der zu schärfenden Klinge 21 dient, erstreckt sich zur Kreuzungsstelle 20 der auseinandergespreizten Wetzstäbe 4, 5. Das heißt, durch den Druck des Messers bzw. der Klinge 21 in Richtung des geschlossenen Schlitzendes 10 werden die Wetzstäbe 4, 5 entgegen der Kraft der Federn 18, 19 auseinandergespreizt, wie in Figur 1 gezeigt.The slot 8, which serves to receive and guide a knife with the blade 21 to be sharpened, extends to the crossing point 20 of the spread wands 4, 5. That is, by the pressure of the knife or the blade 21 in the direction of the closed slot end 10th the Wetzstäbe 4, 5 are spread apart against the force of the springs 18, 19, as shown in Figure 1.

Wie in Figur 3 zu sehen, weisen die beiden Keramikstäbe 4, 5 einen quadratischen oder rechteckigen Querschnitt auf, wobei die einander zugewandten Seiten a, b der beiden Rechtecke parallel zueinander verlaufen. Es ist aber auch ein dreieckiger Querschnitt denkbar, wobei dann die einander zugewandten Seiten der beiden Dreiecke parallel verlaufen oder allgemein bei einem mehreckigen Querschnitt der Wetzstäbe 4, 5 die beiden einander zugewandten Seiten der beiden Mehrecke.As can be seen in FIG. 3, the two ceramic rods 4, 5 have a square or rectangular cross section, with the mutually facing sides a, b of the two rectangles running parallel to one another. But it is also a triangular cross-section conceivable, in which case the mutually facing sides of the two triangles are parallel or generally in a polygonal cross-section of the Wetzstäbe 4, 5, the two mutually facing sides of the two mehrecke.

Die Wetzstäbe 4, 5 werden durch das Schärfen der Messer mit der Zeit abgenutzt. Dabei kann sich im unteren Endbereich 10 des Schlitzes 8 mit der Zeit eine Stufe ausbilden. Um die Bildung solcher Stufen zu verhindern, sind die Wetzstäbe 4, 5 in diesem Bereich verjüngt ausgebildet und zwar durch Einschnürungen 23, 24.The Wetzstäbe 4, 5 are worn by sharpening the knife over time. In this case, a step can form in the lower end region 10 of the slot 8 over time. In order to prevent the formation of such steps, the Wetzstäbe 4, 5 are tapered in this area and by constrictions 23, 24th

Die Wetzstäbe 4, 5 weisen zur Führung in den bogenförmigen Schlitzen 12, 13 an ihren oberen Ende weitere Zapfen 25, 26 auf, die mit einem Abschnitt 27 mit reduziertem Durchmesser versehen sind, der in den Führungsschlitz 12, 13 eingreift. In gleicher Weise weisen die Zapfen 14, 15 an den Drehachsen 6, 7 einen Abschnitt mit reduziertem Durchmesser auf, der in eine Bohrung 31, 32 in der Halteplatte 3 eingreift. Die Zapfen 14, 15 sowie die weiteren Zapfen 25, 26 bestehen aus Kunststoff. Da die Zapfen 14, 15 bzw. die weiteren Zapfen 25, 26 gleich ausgebildet sind, ist in Figur 4 nur der Zapfen 14 dargestellt. Der Zapfen 14 ist mit rechteckigen sackförmigen Aufnahmen 33, 34 versehen, in die das eine Ende des Wetzstabes 4 bzw. 5 gesteckt ist. In die feine Sackbohrung 35 des Zapfens 14 ist das Ende der Federstäbe 18, 19 gesteckt. Durch die Bohrungen 37, 38 kann Feuchtigkeit aus den Aufnahmen 33, 34 austreten. Der Abschnitt 27 mit reduziertem Durchmesser weist ein Innengewinde 40 auf, in das als Gegenstück die Kopfschraube 42 geschraubt wird. Die unbenutzte Aufnahme 33 bzw. 34 kann verschlossen werden.The Wetzstäbe 4, 5 have for guiding in the arcuate slots 12, 13 at its upper end further pins 25, 26 which are provided with a reduced diameter portion 27 which engages in the guide slot 12, 13. In the same way, the pins 14, 15 on the axes of rotation 6, 7 on a reduced diameter portion which engages in a bore 31, 32 in the holding plate 3. The pins 14, 15 and the other pins 25, 26 are made of plastic. Since the pins 14, 15 and the other pins 25, 26 are identical, only the pin 14 is shown in Figure 4. The pin 14 is provided with rectangular bag-shaped receptacles 33, 34 into which one end of the Wetzstabes 4 and 5 is inserted. In the fine blind bore 35 of the pin 14, the end of the spring rods 18, 19 is inserted. Through the holes 37, 38 moisture can escape from the receptacles 33, 34. The reduced diameter portion 27 has an internal thread 40 into which the cap screw 42 is screwed as a counterpart. The unused receptacle 33 or 34 can be closed.

Im oberen Bereich 9 des Schlitzes 8 weist die Platte 3 seitliche Aussparungen 41, 42 auf.In the upper region 9 of the slot 8, the plate 3 has lateral recesses 41, 42.

Gemäß Fig. 1 weisen die Wetzstäbe 4, 5 an ihrer Außenseite jeweils eine gestrichelt dargestellte, bogenförmige Platte 44, 45, beispielsweise aus Kunststoff als Fingerschutz auf, die parallel zur Halteplatte 3 verlaufen und axial versetzt sind. Weiterhin sind in Fig. 1 gestrichelt dargestellte Einsätze 46, 47 im Schleifbereich der Wetzstäbe 4, 5 dargestellt, die aus Keramik bestehen. Falls solche Keramikeinsätze 46, 47 verwendet werden, kann auf die Einschnürungen 23, 24 verzichtet werden. Abgesehen von den Einsätzen 46, 47 können dann die Wetzstäbe 4, 5 beispielsweise aus Kunststoff bestehen. Auch ist es möglich, die Wetzstäbe 4, 5 dann einstückig mit den Fingerschutzplatten 44, 45 auszubilden.1, the Wetzstäbe 4, 5 on its outer side in each case a dashed lines, arcuate plate 44, 45, for example made of plastic as finger protection, which are parallel to the support plate 3 and axially offset. Furthermore, shown in dashed lines in Fig. 1 inserts 46, 47 in the grinding region of the Wetzstäbe 4, 5, which consist of ceramic. If such ceramic inserts 46, 47 are used, the constrictions 23, 24 can be dispensed with. Apart from the inserts 46, 47 then the Wetzstäbe 4, 5, for example, consist of plastic. It is also possible, the Wetzstäbe 4, 5 then integrally with the finger protection plates 44, 45 form.

Claims (9)

  1. A knife sharpening apparatus having a plate (3) as holding device on which two intersecting sharpening rods (4,5) are pivotally mounted and loaded toward each other by springs (18, 19), said holding device having a slot (8) open at one end and closed at the other end and extending to the intersection point (20) of the sharpening rods (4, 5) so that upon pressure of the knife (21) in the slot (8) in the direction of the closed end of the slot the sharpening rods (4, 5) are spread apart against the force of the springs (18, 19), characterized in that the sharpening rods (4, 5) are made of plastic and have ceramic inserts (46, 47) in the grinding area, that the plastic (3) in provided with curved guiding slots (12, 13) on each side of the slot (8) for guiding the ends of the sharpening rods (4, 5) facing away from their rotation axes (6, 7), and that the sharpening rods (4, 5) are fastened to a pin (14, 15) pivotally mounted in a bore (31, 32) in the plate (3), the sharpening rods (4, 5) being provided for guidance in the guide slot (12, 13) at the end facing away from the rotation axis (6, 7) with a further pin, the pins (14, 15) for pivotally mounting the sharpening rods (4, 5) and/or the pins (25, 26) for guiding the sharpening rods (4, 5) being formed of plastic and have receiving means (33, 34) for insertion of the ends of the sharpening rods (4, 5).
  2. A knife sharpening device according to claim 1, characterized in that the two sharpening rods (4, 5) have a polygonal cross section, the opposing sides (a, b) of the two polygons extending parallel to each other.
  3. A knife sharpening device according to claim 1 or 2, characterized in that the two sharpening rods (4, 5) have on the opposing sides a portion (23, 24) tapering toward the rotation axes (6, 7) in the closed end area (10) of the slot (8).
  4. A knife sharpening device according to claim 1, characterized in that the ceramics consists of silicon carbide or tungsten carbide.
  5. A knife sharpening device according to any of the above claims, characterized in that the plate (3) is fastened to a base.
  6. A knife sharpening device according to claim 1, characterized in that the springs swiveling the sharpening rods (4, 5) toward each other are formed by torsion bars (18, 19) extending on either side of the slot (8) and fastened at one end rotationally fast to the pin (14, 15) and at the other end to the plate (3).
  7. A knife sharpening apparatus according to any one of the above claims, characterized in that the pins and the further pins (14, 15, 25, 26) have a reduced diameter (27) for enganging the bores (31, 32) or the guiding slots (12, 13), respectively, and that a counterpart (42) connectable with the pins and the further pins (14, 15; 25, 26) and having a larger diameter than the portion with reduced diameter (27) is provided on the other side of the plate (3).
  8. A knife sharpening apparatus according to claim 1, characterized in that the slot (8) is bell mouthed in the open end area (9).
  9. A knife sharpening apparatus according to claim 5, characterized in that the base to which the holding plate (3) is fastened is formed by a pedestal (1).
EP01988641A 2000-10-23 2001-10-10 Knife-sharpening machine Expired - Lifetime EP1328379B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10052439 2000-10-23
DE10052439A DE10052439C1 (en) 2000-10-23 2000-10-23 Knife sharpening device with two crossed sharpening rods has ceramic rods and arc-shaped guides either side of slot
PCT/EP2001/011695 WO2002034470A1 (en) 2000-10-23 2001-10-10 Knife-sharpening machine

Publications (2)

Publication Number Publication Date
EP1328379A1 EP1328379A1 (en) 2003-07-23
EP1328379B1 true EP1328379B1 (en) 2007-05-02

Family

ID=7660708

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01988641A Expired - Lifetime EP1328379B1 (en) 2000-10-23 2001-10-10 Knife-sharpening machine

Country Status (8)

Country Link
US (1) US6905403B2 (en)
EP (1) EP1328379B1 (en)
JP (1) JP3934550B2 (en)
AT (1) ATE361177T1 (en)
DE (2) DE10052439C1 (en)
ES (1) ES2284715T3 (en)
PT (1) PT1328379E (en)
WO (1) WO2002034470A1 (en)

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DE102007061535A1 (en) 2007-12-20 2009-06-25 Harald Stallegger Knife sharpening device, has intersecting sharpening bars lockable with locking device for sharpening of knife in pulling position, in which intersecting angle of bars is larger than intersecting angle in sharpening position

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US20070101826A1 (en) * 2002-11-12 2007-05-10 Southern Mechanical & Structural, Inc. Knife sharpener
US6866569B2 (en) * 2002-11-14 2005-03-15 Cozzini, Inc. Blade sharpening apparatus
DE102004006714A1 (en) * 2004-02-11 2005-08-25 Harald Stallegger Sharpening device for knives were has sharpening bars in housing with front and rear wall forming knife insertion aperture, with parallel slots
FR2867098B1 (en) * 2004-03-04 2006-05-05 Dassaud Fils Sa DEVICE FOR SHARPENING TOOL BLADE OF CUTTING TOOL
ES2270728B1 (en) * 2005-09-21 2008-03-16 Frederic Sciamma USEFUL TO MANUALLY SHARP CUTTING TOOLS.
DE102006041538B3 (en) * 2006-09-05 2008-01-10 Friedr. Dick Gmbh & Co. Kg Sharpening device for knife blades has a guide slot for knife blades to be sharpened and main moving sharpening rods fitted on each side of the guide slot
US8267749B2 (en) * 2008-03-14 2012-09-18 Smith's Consumer Products, Inc Abrasive sharpener having square abrasive rods
DE102008051405A1 (en) * 2008-10-11 2010-04-15 Harald Stallegger knife block
KR101333640B1 (en) 2012-02-29 2013-12-02 김영숙 A Blade Sharpner
KR101322448B1 (en) * 2013-04-18 2013-10-28 김범석 Apparatus for grinding
FR3020299B1 (en) 2014-04-23 2016-05-20 Dassaud Fils DEVICE FOR AFFILING A TOOL BLADE OF A CUTTING TOOL
GB2519852B (en) * 2014-09-12 2015-10-07 Scott Cutters Ltd Tool for conditioning a blade of a plastering tool
CN105563365A (en) * 2014-11-01 2016-05-11 罗善形 Foot suction type knife grinding frame
US9545703B1 (en) * 2015-08-10 2017-01-17 Razor Edge Systems, Inc. Miniature knife sharpening apparatus
USD826667S1 (en) 2017-08-31 2018-08-28 Davinci Ii Csj, Llc Knife sharpener
DE102018112576A1 (en) * 2018-02-01 2019-08-01 Harald Stallegger Knife sharpening device with a housing
US11253968B2 (en) * 2018-08-08 2022-02-22 Smith's Consumer Products, Inc. Adjustable sharpener
USD900582S1 (en) * 2019-07-09 2020-11-03 Harald Stallegger Knife sharpener
CN110385655A (en) * 2019-08-20 2019-10-29 冯建峰 A kind of sharpening sheet and the knife sharpener using the sharpening sheet
USD884451S1 (en) * 2019-09-19 2020-05-19 ChaoWu Li Portable metal knife sharpener
US11229984B1 (en) 2020-07-24 2022-01-25 Kenneth A. Wildman Knife sharpening apparatus and method
RU2754004C1 (en) * 2020-10-30 2021-08-25 Общество с ограниченной ответственностью ТехноСтудия «Профиль» Knife sharpening device
TWM626796U (en) * 2021-11-22 2022-05-11 科為工業股份有限公司 Electric knife sharpener
USD1007994S1 (en) * 2022-03-09 2023-12-19 Hc Gjedde V/Hans Christian Gjedde Knife sharpener

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
DE102007061535A1 (en) 2007-12-20 2009-06-25 Harald Stallegger Knife sharpening device, has intersecting sharpening bars lockable with locking device for sharpening of knife in pulling position, in which intersecting angle of bars is larger than intersecting angle in sharpening position
DE102007061535B4 (en) * 2007-12-20 2017-03-16 Harald Stallegger Knife sharpening

Also Published As

Publication number Publication date
US6905403B2 (en) 2005-06-14
DE50112459D1 (en) 2007-06-14
US20040014415A1 (en) 2004-01-22
ES2284715T3 (en) 2007-11-16
PT1328379E (en) 2007-07-26
JP2004512186A (en) 2004-04-22
ATE361177T1 (en) 2007-05-15
JP3934550B2 (en) 2007-06-20
WO2002034470A8 (en) 2003-02-27
DE10052439C1 (en) 2001-10-31
EP1328379A1 (en) 2003-07-23
WO2002034470A1 (en) 2002-05-02

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