EP0897330B1 - A ceramic blade - Google Patents
A ceramic blade Download PDFInfo
- Publication number
- EP0897330B1 EP0897330B1 EP97924879A EP97924879A EP0897330B1 EP 0897330 B1 EP0897330 B1 EP 0897330B1 EP 97924879 A EP97924879 A EP 97924879A EP 97924879 A EP97924879 A EP 97924879A EP 0897330 B1 EP0897330 B1 EP 0897330B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- upper edge
- blade according
- ceramic
- blades
- 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
Links
- 239000000919 ceramic Substances 0.000 title claims description 12
- 229910010293 ceramic material Inorganic materials 0.000 claims description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 4
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 2
- 229910052574 oxide ceramic Inorganic materials 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000001746 injection moulding Methods 0.000 claims 1
- 238000005452 bending Methods 0.000 description 9
- 230000007704 transition Effects 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B9/00—Blades for hand knives
Definitions
- the invention relates to a ceramic blade of a cutting tool, especially a knife, according to the preamble of Claim 1 (see US-A-5 077 901).
- blades of a cutting tool in particular of a knife, almost exclusively steel blades available. They have a cutting edge that is in two side faces passes, and have opposite to the cutting edge an upper edge. Furthermore, fasteners are usually in Form of tabs or the like with which the Attachment to a handle or handle is possible. In case of Pocket knives a hole is provided, which from a in Handle anchored peg is interspersed so that the blade is designed foldable.
- the upper edge of the blade is designed as a flat surface and kept relatively wide, so over the index finger or through Laying on the palm of the user exerted force from above and pressed the cutting edge into the material to be cut and / or can be pulled through. Towards the side surfaces the transition is sharp-edged.
- Cutting tools are now also occasionally on the market available in the form of knives, the blades of which are made of a ceramic Material. Compared to the one described at the beginning Steel blades have the advantage of a higher one Wear resistance, which results in a much higher Lifespan is reflected. Regrinding or resharpening is not necessary for normal use.
- These ceramic blades differ in their geometric design not of conventional steel blades, whose shape has been kept unchanged.
- US-A-3 035 344 publishes a knife blade made of plastic, aluminum or steel with a rounded top edge.
- the invention was therefore based on the object, a ceramic To further develop the blade of the type mentioned at the beginning that it no longer has the disadvantages described. In particular, it should be ensured that they are largely is insensitive to bending stress and therefore an early failure due to bending fracture largely is avoided.
- the invention is based on the idea of the top edge of the blade to be rounded off to the side surfaces. Contrary to that usually usual approach, due to the risk of bending It was shown to decrease the thickness of the blade surprisingly, that already comparatively small radii are sufficient to avoid the risk of bending at a constant thickness significantly reduce.
- the effect should be in are essentially based on the fact that when the blade is sintered, tensions, which is unavoidable in the previous sharp-edged version are can be significantly reduced. This Tensions are responsible for the bending stresses found cracks.
- a further improvement in the mechanical properties results provided the blade is injection molded is.
- This method ideally allows one homogeneous structure structure, even with more complex shapes and when the cross section varies, for example in Area of the top that can be adhered to. It can also Shaping the green body with such precision, that post-processing after sintering is not more is needed. This applies in particular to the Cutting edge that needs no further treatment. Specifically this aspect is of great importance as it is known for ceramic materials to break out individual structural grains can come during processing. Furthermore, at of finishing cracks in the grain are induced which the Significantly increase notch sensitivity.
- Oxide ceramics for example aluminum oxide (Al 2 O 3 ) or zirconium oxide (ZrO 2 ), are used in particular as ceramics.
- Aluminum oxide in particular with a high degree of purity (for example higher than 95%), results in a particularly high wear resistance.
- Zirconium oxide on the other hand, is less wear-resistant, but gives the blade a very high degree of elasticity.
- a mixture of aluminum oxide and zirconium oxide that combines both properties has proven to be optimal.
- the blade 1 has a cutting edge 10 which is the lower one Intersection of two opposite side surfaces 14, 16 represents.
- the Side surfaces 14, 16 essentially parallel upwards and each go into one of the two side surfaces 14, 16 interconnecting upper edge 12 over.
- the contour course A largely corresponds to the previous appearance such blades with the difference that at the transition from the upper edge 12 to the respective side surfaces 14, 16 a radius 18 is formed.
- the radius here is very chosen small, so that the upper edge 12 is still largely even (and horizontal in the illustrated embodiment gradient) is designed.
- the contour course B has the shape of a semi-ellipse, whereby the large semiaxis, the two side surfaces 14, 16 at right angles cuts.
- the contour course D is also a semi-ellipse, whereby however, in contrast to the contour course B, the small semi-axis intersects the two side surfaces 14, 16 at right angles.
- the contour course C is a semicircle and represents on the mechanical properties on the one hand and the handling on the other hand, an optimal compromise by the user represents.
- the contour of the semicircle C represents the maximum possible Radius represents that can be realized. Starting from one The transition to the vertex of the Top edge 12 and the subsequent return area to opposite side surface with constant curvature, so that the stresses occurring during the sintering process ideally distribute evenly.
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- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Knives (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
Die Erfindung betrifft eine keramische Klinge eines Schneidwerkzeugs, insbesondere eines Messers, gemäß Oberbegriff des Anspruchs 1 (vgl. US-A-5 077 901).The invention relates to a ceramic blade of a cutting tool, especially a knife, according to the preamble of Claim 1 (see US-A-5 077 901).
Bislang sind als Klingen eines Schneidwerkzeugs, insbesondere eines Messers, fast ausschließlich Klingen aus Stahl erhältlich. Sie weisen eine Schneide auf, die in zwei Seitenflächen übergeht, und besitzen gegenüberliegend zur Schneide verlaufend eine Oberkante. Ferner sind meist Befestigungsmittel in Form von Laschen oder dergleichen vorhanden, mit denen die Befestigung an einem Griff oder Heft möglich ist. Im Falle von Taschenmessern ist eine Bohrung vorgesehen, die von einem im Heft verankerten Lagebolzen durchsetzt ist, so daß die Klinge einklappbar gestaltet ist.So far, as blades of a cutting tool, in particular of a knife, almost exclusively steel blades available. They have a cutting edge that is in two side faces passes, and have opposite to the cutting edge an upper edge. Furthermore, fasteners are usually in Form of tabs or the like with which the Attachment to a handle or handle is possible. In case of Pocket knives a hole is provided, which from a in Handle anchored peg is interspersed so that the blade is designed foldable.
Die Oberkante der Klinge ist als ebene Fläche ausgebildet und relativ breit gehalten, damit über den Zeigefinger bzw. durch Auflegen der Handfläche des Benutzers von oben Kraft ausgeübt und die Schneide in das zu schneidende Gut eingedrückt und/oder hindurchgezogen werden kann. Zu den Seitenflächen hin ist der Übergang scharfkantig ausgeführt.The upper edge of the blade is designed as a flat surface and kept relatively wide, so over the index finger or through Laying on the palm of the user exerted force from above and pressed the cutting edge into the material to be cut and / or can be pulled through. Towards the side surfaces the transition is sharp-edged.
Vereinzelt sind mittlerweile im Handel auch Schneidwerkzeuge in Form von Messern erhältlich, deren Klingen aus einem keramischen Werkstoff bestehen. Gegenüber den eingangs beschriebenen Stahlklingen besitzen diese den Vorteil einer höheren Verschleißfestigkeit, die sich in einer wesentlich höheren Lebensdauer niederschlägt. Ein Nachschleifen oder Nachschärfen ist bei normaler Beanspruchung nicht erforderlich.Cutting tools are now also occasionally on the market available in the form of knives, the blades of which are made of a ceramic Material. Compared to the one described at the beginning Steel blades have the advantage of a higher one Wear resistance, which results in a much higher Lifespan is reflected. Regrinding or resharpening is not necessary for normal use.
Diese keramischen Klingen unterscheiden hinsichtlich ihrer geometrischen Gestaltung nicht von herkömmlichen Stahlklingen, deren Form unverändert beibehalten wurde.These ceramic blades differ in their geometric design not of conventional steel blades, whose shape has been kept unchanged.
Obwohl keramische Klingen eine hervorragende Alternative zu den bislang verwendeten Stahlklingen darstellen, zeigen sich im täglichen Gebrauch eine Reihe von Nachteilen, die bislang eine weitergehende Akzeptanz verhindert haben. So hat es sich gezeigt, daß derartige Klingen sehr stark bruchgefährdet sind, sobald sie einer Biegebeanspruchung ausgesetzt sind. Speziell bei sehr harten Keramikwerkstoffen, wie beispielsweise Aluminiumoxid, führt dies in der Regel zu einem vorzeitigen Erreichen des Lebensdauerendes, da sich Biegebeanspruchungen beim täglichen Gebrauch kaum vermeiden lassen. Das Lebensdauerende wird deshalb häufig vorzeitig durch eine unbeabsichtigte Biegebeanspruchung erreicht, obwohl die für die Trennfunktion maßgebliche Schneide noch voll funktionsfähig ist.Although ceramic blades are an excellent alternative too the steel blades used up to now are shown in daily use a number of disadvantages that have so far prevented further acceptance. So it happened shown that such blades are very likely to break, as soon as they are subjected to bending stress. Specifically for very hard ceramic materials, such as aluminum oxide, this usually leads to an early achievement the end of the service life, since there are bending stresses can hardly be avoided in daily use. The end of life is therefore often prematurely caused by an unintentional Bending stress reached, although that for the separation function relevant cutting edge is still fully functional.
US-A-3 035 344 veröffentlicht eine Messerklinge aus Kunststoff, Aluminium oder Stahl mit abgerundeter Oberkannte.US-A-3 035 344 publishes a knife blade made of plastic, aluminum or steel with a rounded top edge.
Der Erfindung lag deshalb die Aufgabe zugrunde, eine keramische Klinge der eingangs genannten Art derart weiterzuentwickeln, daß sie die geschilderten Nachteile nicht mehr aufweist. Insbesondere sollte sichergestellt sein, daß sie weitgehend unempfindlich gegenüber Biegebeanspruchungen ist und somit ein vorzeitiger Ausfall infolge Biegebruchs weitgehend vermieden wird.The invention was therefore based on the object, a ceramic To further develop the blade of the type mentioned at the beginning that it no longer has the disadvantages described. In particular, it should be ensured that they are largely is insensitive to bending stress and therefore an early failure due to bending fracture largely is avoided.
Das Problem wird mit einer Klinge gelöst, die die Merkmale des
Anspruchs 1 aufweist. Vorteilhafte Ausgestaltungsformen der
Erfindung sind durch die Merkmale der Unteransprüche angegeben.The problem is solved with a blade that has the characteristics of the
Die Erfindung basiert auf der Idee, die Oberkante der Klinge zu den Seitenflächen hin abgerundet auszuführen. Entgegen dem normalerweise üblichen Ansatz, die Biegebruchgefahr durch Erhöhung der Dicke der Klinge zu vermindern, zeigte es sich überraschenderweise, daß bereits vergleichsweise kleine Radien ausreichend sind, um bei gleichbleibender Dicke die Biegebruchgefahr erheblich zu reduzieren. Der Effekt dürfte im wesentlichen darauf beruhen, daß beim Sintern der Klinge Spannungen, die bei der bisherigen scharfkantigen Ausführung unvermeidbar sind, erheblich reduziert werden können. Diese Spannungen sind verantwortlich für die bei Biegebeanspruchungen festgestellten Rißbildungen.The invention is based on the idea of the top edge of the blade to be rounded off to the side surfaces. Contrary to that usually usual approach, due to the risk of bending It was shown to decrease the thickness of the blade surprisingly, that already comparatively small radii are sufficient to avoid the risk of bending at a constant thickness significantly reduce. The effect should be in are essentially based on the fact that when the blade is sintered, tensions, which is unavoidable in the previous sharp-edged version are can be significantly reduced. This Tensions are responsible for the bending stresses found cracks.
Gleichzeitig ist die Kantenbruchfestigkeit der Klinge deutlich erhöht. So traten bei den bisher verwendeten keramischen Klingen sehr rasch Brüche am Übergang von der Seitenfläche zur Oberkante auf, insbesondere beim Anschlagen der Klinge an harten Gegenstände. Diese Problematik tritt bei Klingen mit abgerundeten Oberkante praktisch nicht mehr auf, so daß sie im täglichen Gebrauch erheblich weniger beschädigungsgefährdet sind.At the same time, the edge breaking strength of the blade is clear elevated. So occurred with the previously used ceramic blades breaks very quickly at the transition from the side surface to the Top edge, especially when hitting the blade hard objects. This problem occurs with blades rounded top edge practically no longer, so that it in daily use significantly less prone to damage are.
Als zusätzlicher Vorteil der abgerundeten Oberkanten stellte sich heraus, daß auch die Beschädigungsgefahr von Besteckteilen, die mit keramischen Klingen in Berührung kommen, erheblich reduziert wird. Diese Situation ist insbesondere dann relevant, wenn Schneidwerkzeuge mit keramischen Klingen zusammen mit herkömmlichen Besteckteilen in einer Geschirrspülmaschine gereinigt werden. Der umlaufende Spül- und Reinigungsstrahl setzt die im Besteckkorb befindlichen Besteckteile in Bewegung, so daß diese ständig miteinander in Kontakt geraten. Wegen der im Vergleich zu anderen Materialien, die üblicherweise für Besteckteile verwendet werden, erheblich höheren Härte ist das Beschädigungsrisiko durch scharfe Kanten besonders hoch. Auch hier zeigen die mit abgerundeten Kanten gestalteten keramischen Klingen gemäß der Erfindung weitere Vorteile.As an additional advantage of the rounded top edges it turns out that the risk of damage to cutlery items, that come into contact with ceramic blades, considerably is reduced. This situation is especially then relevant when cutting tools with ceramic blades with conventional cutlery in a dishwasher getting cleaned. The all-round rinsing and cleaning jet sets the cutlery items in the cutlery basket in motion so that they are in constant contact with each other devices. Because of the compared to other materials that usually used for cutlery, considerably Higher hardness is the risk of damage from sharp edges especially high. Here, too, show those with rounded edges designed ceramic blades according to the invention further Benefits.
Eine spürbare Verbesserung des Biegebruchverhaltens stellt sich bereits dann ein, wenn der Übergang von der Oberkante zu den Seitenflächen mit einem verhältnismäßig kleinen Radius versehen ist. Damit kann das bisherige Aussehen der Klinge weitgehend beibehalten werden, da deren Oberkante weiterhin eben ausgeführt sein kann. Lediglich unmittelbar am Übergangsbereich zu den Seitenflächen sind kleine Radien vorgesehen. Damit steht weiterhin eine große Angriffsfläche zur Verfügung, um - wie eingangs beschrieben - mit dem Zeigefinger oder der Hand von oben Kraft auszuüben.A noticeable improvement in the bending fracture behavior already when the transition from the top edge to the side surfaces with a relatively small radius is provided. This can change the previous appearance of the blade largely retained, as the top edge continues can just be executed. Only directly at the transition area small radii are provided to the side surfaces. This means that there is still a large area of attack available to - as described at the beginning - with the index finger or the Exercise strength from above.
Konkret stellt sich die Verbesserung der Bruchfestigkeit bereits bei Radien ein, die größer als 0,3 bis 0,5 mm sind. Bei üblichen Klingenbreiten von 1,5 bis 4,5 mm verbleibt damit noch ein großer, eben verlaufender Abschnitt im Bereich der Oberkante.In concrete terms, the improvement in breaking strength is already emerging for radii that are larger than 0.3 to 0.5 mm. At This leaves the usual blade widths of 1.5 to 4.5 mm another large, level section in the area of Top edge.
Als optimal im Sinne vorstehender mechanischer Eigenschaften haben sich jedoch Gestaltungen der Oberkante in Form von Halbellipsen oder Halbkreisen ergeben. Dies bedeutet, daß die Oberkante durchgehend gekrümmt zwischen den beiden Seitenfläche der Klinge verläuft. Die hervorragenden mechanischen Eigenschaften beruhen vermutlich auf der fast ideal gleichverteilten Spannung während des Sintervorgangs.As optimal in terms of the above mechanical properties have, however, designs of the upper edge in the form of semi-ellipses or semicircles. This means that the Upper edge continuously curved between the two side surfaces the blade runs. The excellent mechanical Properties are probably based on the almost ideally evenly distributed Tension during the sintering process.
Eine weitere Verbesserung der mechanischen Eigenschaften ergibt sich, sofern die Klinge im Spritzgießverfahren hergestellt ist. Dieses Verfahren erlaubt in idealer Weise einen homogenen Aufbau der Struktur, die auch bei komplexerer Formgebung und bei Variation des Querschnitts, beispielsweise im Bereich der Spitze, eingehalten werden kann. Auch kann die Formgebung des Grünlings mit einer derartigen Präzision erfolgen, daß im Anschluß an das Sintern eine Nachbearbeitung nicht mehr erforderlich ist. Dies betrifft insbesondere auch die Schneide, die keiner weiteren Behandlung mehr bedarf. Speziell dieser Aspekt ist von großer Bedeutung, da es bekanntermaßen bei keramischen Werkstoffen zum Ausbrechen einzelner Gefügekörner bei der Bearbeitung kommen kann. Weiterhin können bei der Endbearbeitung Risse im Korn induziert werden, die die Kerbempfindlichkeit erheblich erhöhen.A further improvement in the mechanical properties results provided the blade is injection molded is. This method ideally allows one homogeneous structure structure, even with more complex shapes and when the cross section varies, for example in Area of the top that can be adhered to. It can also Shaping the green body with such precision, that post-processing after sintering is not more is needed. This applies in particular to the Cutting edge that needs no further treatment. Specifically this aspect is of great importance as it is known for ceramic materials to break out individual structural grains can come during processing. Furthermore, at of finishing cracks in the grain are induced which the Significantly increase notch sensitivity.
Als Keramiken werden insbesondere Oxidkeramiken, beispielsweise Aluminiumoxid (Al2O3) oder Zirkonoxid (ZrO2) verwendet. Aluminiumoxid, insbesondere mit hohem Reinheitsgrad (beispielsweise höher als 95 %) ergeben eine besondere hohe Verschleißfestigkeit. Zirkonoxid hingegen ist weniger Verschleißfest, verleiht der Klinge jedoch eine sehr hohe Elastizität. Als optimal hat sich deshalb ein Gemisch aus Aluminiumoxid und Zirkonoxid bewährt, das beide Eigenschaften miteinander verbindet.Oxide ceramics, for example aluminum oxide (Al 2 O 3 ) or zirconium oxide (ZrO 2 ), are used in particular as ceramics. Aluminum oxide, in particular with a high degree of purity (for example higher than 95%), results in a particularly high wear resistance. Zirconium oxide, on the other hand, is less wear-resistant, but gives the blade a very high degree of elasticity. A mixture of aluminum oxide and zirconium oxide that combines both properties has proven to be optimal.
Die Erfindung wird nachstehend näher anhand des in der Figur dargestellten Ausführungsbeispiels erläutert. Die einzige Figur zeigt die erfindungsgemäße keramische Klinge im Querschnitt mit unterschiedlich gestalteten Konturen der Oberkante.The invention is explained in more detail below with the aid of the figure illustrated embodiment explained. The only Figure shows the ceramic blade according to the invention in cross section with differently shaped contours of the upper edge.
Die Klinge 1 weist eine Schneide 10 auf, die den unteren
Schnittpunkt zweier gegenüberliegender Seitenflächen 14, 16
darstellt. Im dargestellten Ausführungsbeispiel verlaufen die
Seitenflächen 14, 16 nach oben hin im wesentlichen parallel
und gehen jeweils in eine die beiden Seitenflächen 14, 16
miteinander verbindende Oberkante 12 über.The
In der Figur sind vier verschiedene Varianten (Konturverläufe A, B, C, D) dargestellt.There are four different variants in the figure (contour profiles A, B, C, D).
Der Konturverlauf A entspricht weitgehend dem bisherigen Aussehen
derartiger Klingen mit dem Unterschied, daß beim Übergang
von der Oberkante 12 zu den jeweiligen Seitenflächen 14,
16 ein Radius 18 angeformt ist. Der Radius ist hierbei sehr
klein gewählt, so daß die Oberkante 12 nach wie vor weitgehend
eben (und im dargestellten Ausführungsbeispiel horizontal
verlaufend) gestaltet ist.The contour course A largely corresponds to the previous appearance
such blades with the difference that at the transition
from the
Der Konturverlauf B besitzt die Form einer Halbellipse, wobei
die große Halbachse die beiden Seitenflächen 14, 16 rechtwinklig
schneidet.The contour course B has the shape of a semi-ellipse, whereby
the large semiaxis, the two
Der Konturverlauf D ist ebenfalls eine Halbellipse, wobei
jedoch im Unterschied zum Konturverlauf B die kleine Halbachse
die beiden Seitenfläche 14, 16 rechtwinklig schneidet.The contour course D is also a semi-ellipse, whereby
however, in contrast to the contour course B, the small semi-axis
intersects the two
Der Konturverlauf C ist ein Halbkreis und stellt im Hinblick
auf die mechanischen Eigenschaften einerseits und die Handhabung
durch den Benutzer andererseits einen optimalen Kompromiß
dar. Die Kontur des Halbkreises C stellt den maximal möglichen
Radius dar, der sich realisieren läßt. Ausgehend von der einen
Seitenfläche erfolgt der Übergang zum Scheitelpunkt der
Oberkante 12 und der sich anschließende Rückkehrbereich zur
gegenüberliegenden Seitenfläche mit konstanter Krümmung, so
daß sich die während des Sintervorgangs auftretenden Spannungen
ideal gleichmäßig verteilen.The contour course C is a semicircle and represents
on the mechanical properties on the one hand and the handling
on the other hand, an optimal compromise by the user
represents. The contour of the semicircle C represents the maximum possible
Radius represents that can be realized. Starting from one
The transition to the vertex of the
Claims (7)
- A ceramic blade of a cutting tool, in particular of a knife, having a cutting edge (1) merging into two side faces and an upper edge extending opposite to the cutting edge,
characterised in that the upper edge (12) is rounded towards the side faces (14, 16). - A blade according to Claim 1,
characterised in that the upper edge (12) merges into the side faces (14, 16) of the blade (1), preferably on both sides with the formation of a radius (18). - A blade according to Claim 2,
characterised in that the radius (18) is greater than 0.3 mm, preferably greater than 0.5 mm. - A blade according to one of the preceding Claims,
characterised in that in cross section the upper edge (12) has the shape of a semi-ellipse (B; D). - A blade according to one of Claims 1 to 3,
characterised in that in cross section the upper edge (12) has the shape of a semi-circle (C). - A blade according to one of the preceding Claims,
characterised in that it is manufactured in the injection moulding process. - A blade according to one of the preceding Claims,
characterised in that the ceramic material is an oxide ceramic material, preferably aluminium oxide, zirconium oxide or a mixture thereof.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19618803A DE19618803C2 (en) | 1996-05-10 | 1996-05-10 | Ceramic blade |
| DE19618803 | 1996-05-10 | ||
| PCT/DE1997/000959 WO1997043095A1 (en) | 1996-05-10 | 1997-05-07 | A ceramic blade |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0897330A1 EP0897330A1 (en) | 1999-02-24 |
| EP0897330B1 true EP0897330B1 (en) | 2000-03-08 |
Family
ID=7793909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97924879A Expired - Lifetime EP0897330B1 (en) | 1996-05-10 | 1997-05-07 | A ceramic blade |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6151786A (en) |
| EP (1) | EP0897330B1 (en) |
| DE (2) | DE19618803C2 (en) |
| ES (1) | ES2144314T3 (en) |
| WO (1) | WO1997043095A1 (en) |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19811195B4 (en) * | 1998-03-09 | 2007-03-01 | Sternplastic Hellstern Gmbh & Co. Kg | Ceramic cutlery and method for its production |
| FR2790516B1 (en) | 1999-03-01 | 2001-05-11 | Renault | METHOD FOR CONTROLLING AN INTERNAL COMBUSTION ENGINE |
| DE19951587C2 (en) * | 1999-10-27 | 2003-05-28 | Daimler Chrysler Ag | Tool for shearing cutting of semi-finished products |
| US7140113B2 (en) * | 2001-04-17 | 2006-11-28 | Lazorblades, Inc. | Ceramic blade and production method therefor |
| AT5545U1 (en) | 2001-09-13 | 2002-08-26 | Technoplast Kunststofftechnik | DEVICE FOR THE CHIP-FREE SEPARATION OF PLASTIC PROFILES |
| GB0127083D0 (en) * | 2001-11-10 | 2002-01-02 | P W Allen & Company Ltd | Device for breaking glass |
| MXPA04008789A (en) | 2002-03-11 | 2004-11-26 | Becton Dickinson Co | System and method for the manufacture of surgical blades. |
| US6739991B1 (en) | 2002-06-18 | 2004-05-25 | Byron G. Wardropper | Method and apparatus for making a ceramic arrowhead blade |
| DE20306990U1 (en) * | 2003-05-05 | 2003-07-10 | at-design Büro für Produktdesign, 91054 Erlangen | Sharpener for writing, drawing and cosmetic pens |
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| TWI282299B (en) * | 2004-09-23 | 2007-06-11 | Ind Tech Res Inst | Ceramic blade and fabrication method thereof |
| US20080066320A1 (en) * | 2005-06-17 | 2008-03-20 | Delaney Dewey R Sr | Flooring Material Cutting Device |
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| US9662796B2 (en) * | 2012-04-26 | 2017-05-30 | Thomas Scimone | Ceramic cutting blades |
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| US10814508B1 (en) | 2017-07-26 | 2020-10-27 | Bredan, Inc. | Razor |
| US11135731B2 (en) * | 2017-12-23 | 2021-10-05 | Slice, Inc. | Cutting device having a locking member |
| US11104013B2 (en) * | 2019-01-03 | 2021-08-31 | Slice, Inc. | Cutting device |
| US10889013B2 (en) * | 2019-01-03 | 2021-01-12 | Slice, Inc. | Cutting device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR478248A (en) * | 1914-08-04 | 1915-11-29 | Titus Andrew Beecher | Knife blade improvements |
| US2279833A (en) * | 1941-08-01 | 1942-04-14 | Edward K Madan | Knife |
| US2566112A (en) * | 1949-02-09 | 1951-08-28 | W R Case & Sons Cutlery Co | Knife blade construction |
| US3035344A (en) * | 1960-06-17 | 1962-05-22 | Edward G Brown | Slicing knife |
| US3252219A (en) * | 1964-07-20 | 1966-05-24 | Fuji Shokuhin Company Ltd | Knife |
| US3543402A (en) * | 1968-04-15 | 1970-12-01 | Coors Porcelain Co | Ceramic cutting blade |
| DE3538169A1 (en) * | 1985-10-26 | 1987-04-30 | Licentia Gmbh | Cutting knife |
| US5077901A (en) * | 1990-05-18 | 1992-01-07 | Warner Joseph A | Ceramic blades and production methodology therefor |
| DE4040229A1 (en) * | 1990-12-15 | 1992-06-17 | Rennebeck Klaus | Ceramic blade or whetstone - with varied structure in fracture-sensitive regions |
-
1996
- 1996-05-10 DE DE19618803A patent/DE19618803C2/en not_active Expired - Fee Related
-
1997
- 1997-05-07 ES ES97924879T patent/ES2144314T3/en not_active Expired - Lifetime
- 1997-05-07 US US09/180,545 patent/US6151786A/en not_active Expired - Fee Related
- 1997-05-07 WO PCT/DE1997/000959 patent/WO1997043095A1/en active IP Right Grant
- 1997-05-07 DE DE59701223T patent/DE59701223D1/en not_active Expired - Lifetime
- 1997-05-07 EP EP97924879A patent/EP0897330B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0897330A1 (en) | 1999-02-24 |
| WO1997043095A1 (en) | 1997-11-20 |
| DE19618803A1 (en) | 1997-11-13 |
| DE59701223D1 (en) | 2000-04-13 |
| ES2144314T3 (en) | 2000-06-01 |
| US6151786A (en) | 2000-11-28 |
| DE19618803C2 (en) | 1998-09-03 |
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