EP0897330A1 - Lame en ceramique - Google Patents

Lame en ceramique

Info

Publication number
EP0897330A1
EP0897330A1 EP97924879A EP97924879A EP0897330A1 EP 0897330 A1 EP0897330 A1 EP 0897330A1 EP 97924879 A EP97924879 A EP 97924879A EP 97924879 A EP97924879 A EP 97924879A EP 0897330 A1 EP0897330 A1 EP 0897330A1
Authority
EP
European Patent Office
Prior art keywords
blade
upper edge
ceramic
side surfaces
edge
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.)
Granted
Application number
EP97924879A
Other languages
German (de)
English (en)
Other versions
EP0897330B1 (fr
Inventor
Peter Hellstern
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.)
Sternplastik Hellstern GmbH and Co KG
Original Assignee
Sternplastik Hellstern GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sternplastik Hellstern GmbH and Co KG filed Critical Sternplastik Hellstern GmbH and Co KG
Publication of EP0897330A1 publication Critical patent/EP0897330A1/fr
Application granted granted Critical
Publication of EP0897330B1 publication Critical patent/EP0897330B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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, in particular a knife, according to the preamble of claim 1.
  • blades made of steel have been available as blades of a cutting tool, in particular a knife. They have a cutting edge which merges into two side surfaces and have an upper edge running opposite the cutting edge. Furthermore, there are usually fastening means in the form of tabs or the like, with which fastening to a handle or handle is possible. In the case of pocket knives, a hole is provided which is penetrated by a position bolt anchored in the handle, so that the blade can be folded.
  • the upper edge of the blade is designed as a flat surface and is kept relatively wide so that force can be exerted from above via the index finger or by placing the user's palm on the hand and the cutting edge can be pressed into and / or pulled through the material to be cut.
  • the transition to the side surfaces is sharp.
  • Cutting tools in the form of knives the blades of which are made of a ceramic mix material exist. Compared to the initially-described ⁇ nen steel blades these have the advantage of higher wear resistance, which is reflected in a much longer service life. Regrinding or resharpening is not necessary under normal use.
  • these ceramic blades do not differ from conventional steel blades, the shape of which has been retained unchanged.
  • the invention was therefore based on the object of further developing a ceramic blade of the type mentioned at the outset in such a way that it no longer has the disadvantages described. In particular, it should be ensured that it is largely insensitive to bending stresses and thus premature failure due to bending fracture is largely 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 the usual approach of reducing the risk of bending breakage by increasing the thickness of the blade, it surprisingly turned out that even comparatively small radii are sufficient to significantly reduce the risk of bending breakage while the thickness remains the same.
  • the effect is likely to be based essentially on the fact that when the blade is sintered, stresses which are unavoidable in the previous sharp-edged design can be considerably reduced. These stresses are responsible for the crack formation found in the case of bending stresses.
  • the edge breaking strength of the blade is significantly increased.
  • the improvement in breaking strength is already achieved with radii that are larger than 0.3 to 0.5 mm.
  • blade widths 1.5 to 4.5 mm, a large, level section remains in the area of the upper edge.
  • oxide ceramics ⁇ example, aluminum oxide (Al 2 0 3) or zirconium oxide (Zr0 2).
  • Aluminum oxide in particular with a high degree of purity (for example higher than 95%), results in a particularly high wear resistance.
  • zirconium oxide is less wear-resistant, but gives the blade a very high degree of elasticity.
  • the invention is explained below with reference to the embodiment shown in the figure.
  • the single figure shows the ceramic blade according to the invention in cross section with differently shaped contours of the upper edge.
  • the blade 1 has a cutting edge 10, which represents the lower intersection of two opposite side surfaces 14, 16.
  • the side surfaces 14, 16 run essentially parallel upwards and each transition into an upper edge 12 connecting the two side surfaces 14, 16.
  • the figure shows four different variants (contour profiles A, B, C, D).
  • contour course A largely corresponds to the previous appearance of such blades, with the difference that a radius 18 is formed on the transition from the upper edge 12 to the respective side surfaces 14, 16.
  • the radius is chosen to be very small, so that the upper edge 12 is still largely flat (and runs horizontally in the exemplary embodiment shown).
  • the contour course B has the shape of a semi-ellipse, the large semi-axis extending the two side surfaces 14, 16 ' at right angles. lig cuts.
  • the contour course D is also a semi-ellipse, but 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 an optimal compromise with regard to the mechanical properties on the one hand and the handling by the user on the other hand.
  • the contour of the semicircle C represents the maximum possible radius that can be realized. Starting from the side surface, the transition to the apex of the upper edge 12 and the subsequent return region to the opposite side surface take place with a constant curvature, so that the stresses occurring during the sintering process are ideally distributed evenly.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

Lame en céramique (1) d'un outil de coupe, en particulier d'un couteau, comprenant un arête tranchante (10) et un bord supérieur arrondi (12) opposé à l'arête (10). Le bord supérieur arrondi (12) permet, par rapport aux transitions à angle vif connues jusqu'à présent, d'accroître considérablement la résistance à la rupture dans le cas de sollicitations en flexion.
EP97924879A 1996-05-10 1997-05-07 Lame en ceramique Expired - Lifetime EP0897330B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19618803 1996-05-10
DE19618803A DE19618803C2 (de) 1996-05-10 1996-05-10 Keramische Klinge
PCT/DE1997/000959 WO1997043095A1 (fr) 1996-05-10 1997-05-07 Lame en ceramique

Publications (2)

Publication Number Publication Date
EP0897330A1 true EP0897330A1 (fr) 1999-02-24
EP0897330B1 EP0897330B1 (fr) 2000-03-08

Family

ID=7793909

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97924879A Expired - Lifetime EP0897330B1 (fr) 1996-05-10 1997-05-07 Lame en ceramique

Country Status (5)

Country Link
US (1) US6151786A (fr)
EP (1) EP0897330B1 (fr)
DE (2) DE19618803C2 (fr)
ES (1) ES2144314T3 (fr)
WO (1) WO1997043095A1 (fr)

Families Citing this family (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19811195B4 (de) * 1998-03-09 2007-03-01 Sternplastic Hellstern Gmbh & Co. Kg Keramisches Besteckteil sowie Verfahren zu dessen Herstellung
FR2790516B1 (fr) 1999-03-01 2001-05-11 Renault Procede de commande d'un moteur a combustion interne
DE19951587C2 (de) * 1999-10-27 2003-05-28 Daimler Chrysler Ag Werkzeug zum scherenden Trennen von Halbzeugen
WO2002083374A2 (fr) * 2001-04-17 2002-10-24 Lazorblades, Inc. Lame en ceramique et procede de fabrication
AT5545U1 (de) 2001-09-13 2002-08-26 Technoplast Kunststofftechnik Vorrichtung zum spanlosen trennen von kunststoffprofilen
GB0127083D0 (en) * 2001-11-10 2002-01-02 P W Allen & Company Ltd Device for breaking glass
MXPA04008789A (es) 2002-03-11 2004-11-26 Becton Dickinson Co Sistema y metodo para la fabricacion de cuchillas quirurgicas.
US7387742B2 (en) 2002-03-11 2008-06-17 Becton, Dickinson And Company Silicon blades for surgical and non-surgical use
US6739991B1 (en) 2002-06-18 2004-05-25 Byron G. Wardropper Method and apparatus for making a ceramic arrowhead blade
DE20306990U1 (de) * 2003-05-05 2003-07-10 at-design Büro für Produktdesign, 91054 Erlangen Anspitzer für Schreib-, Zeichen und Kosmetikstifte
US20040255473A1 (en) * 2003-06-17 2004-12-23 Walton Darren Lamoyne Thin back knife
EP1662970A2 (fr) 2003-09-17 2006-06-07 Becton, Dickinson and Company Systeme et procede de creation de tranchees lineaires et non lineaires dans des materiaux au silicium et autres materiaux cristallins au moyen d'une toupie
US7396484B2 (en) 2004-04-30 2008-07-08 Becton, Dickinson And Company Methods of fabricating complex blade geometries from silicon wafers and strengthening blade geometries
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
US20130014396A1 (en) 2011-07-14 2013-01-17 Kenneth James Skrobis Razor blades having a wide facet angle
CN103302681A (zh) * 2012-03-08 2013-09-18 黄大英 陶瓷刀具及其制造方法
US9662796B2 (en) * 2012-04-26 2017-05-30 Thomas Scimone Ceramic cutting blades
CN104647408A (zh) * 2015-02-28 2015-05-27 苏州圣艺文体用品有限公司 一种多变水果刀
US11230025B2 (en) 2015-11-13 2022-01-25 The Gillette Company Llc Razor blade
US11654588B2 (en) * 2016-08-15 2023-05-23 The Gillette Company Llc Razor blades
CN106695910B (zh) * 2017-03-22 2018-06-12 涿州皓原箔业有限公司 一种用于铝箔生产的压花切块一体机
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

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR478248A (fr) * 1914-08-04 1915-11-29 Titus Andrew Beecher Perfectionnements aux lames de couteaux
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 (de) * 1985-10-26 1987-04-30 Licentia Gmbh Trennmesser
US5077901A (en) * 1990-05-18 1992-01-07 Warner Joseph A Ceramic blades and production methodology therefor
DE4040229A1 (de) * 1990-12-15 1992-06-17 Rennebeck Klaus Keramikklinge oder -wetzstein

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9743095A1 *

Also Published As

Publication number Publication date
US6151786A (en) 2000-11-28
DE19618803C2 (de) 1998-09-03
DE59701223D1 (de) 2000-04-13
ES2144314T3 (es) 2000-06-01
EP0897330B1 (fr) 2000-03-08
WO1997043095A1 (fr) 1997-11-20
DE19618803A1 (de) 1997-11-13

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