EP1510303B1 - Messer - Google Patents

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Info

Publication number: EP1510303B1
Authority: EP; European Patent Office
Prior art keywords: knife; cutting edge; depressions; blade surface; blade
Prior art date: 2003-09-01
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

EP03019863A

Other languages

German (de)

English (en)

French (fr)

Other versions

EP1510303A1 (de

Inventor

Rolf Dums

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.)

WMF Group GmbH

Original Assignee

WMF Group GmbH

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.)

2003-09-01

Filing date

2003-09-01

Publication date

2006-11-22

2003-09-01 Priority to DE50305760T priority Critical patent/DE50305760D1/de

2003-09-01 Application filed by WMF Group GmbH filed Critical WMF Group GmbH

2003-09-01 Priority to EP03019863A priority patent/EP1510303B1/de

2003-09-01 Priority to AT03019863T priority patent/ATE345906T1/de

2003-09-01 Priority to ES03019863T priority patent/ES2275984T3/es

2004-04-06 Priority to JP2004112440A priority patent/JP3759943B2/ja

2004-04-30 Priority to RU2004113297/02A priority patent/RU2277468C2/ru

2004-05-28 Priority to SG200402995A priority patent/SG121888A1/en

2005-03-02 Publication of EP1510303A1 publication Critical patent/EP1510303A1/de

2006-11-22 Application granted granted Critical

2006-11-22 Publication of EP1510303B1 publication Critical patent/EP1510303B1/de

2023-09-01 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

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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
- B26B9/02—Blades for hand knives characterised by the shape of the cutting edge, e.g. wavy

Definitions

the invention relates to a knife, in particular a household knife, the type explained in the preamble of claim 1.
Such a knife is known from US-A-1 793 171.
a knife is to be created which, despite molded-in depressions on the cutting edge, retains a straight cutting edge. Consequently, the recesses are incorporated into the material only so far from one blade surface in the direction of the other blade surface that they do not exit on the other blade surface.
the recesses are produced by a grinding wheel whose grinding edge has a substantially semicircular cross-section.
the desired razor sharp cutting edge results only in the central region of the recess, between the central regions of two adjacent wells a stronger cutting edge remains, the less for Tailoring contributes, but also less wears. In contrast, the razor-sharp area will wear out more, so that after a few cuts the effect of depressions fizzles.
serrated knives are also available in many other shapes on the market.
the most common serrated edge includes a plurality of adjacent recesses, which are so far incorporated only in one of the blade surface in the material that they emerge on the opposite blade surface, resulting in a curved cutting edge.
Such a cutting edge has advantages in terms of cutting the material, because the serrated edge provides a cutting edge on the sides of the sheet which is transverse to the normal direction of movement of the knife during cutting, thus greatly facilitating the cutting of transverse fibers so that the cut becomes smoother ,
the cutting edge is shifted to a slightly oblique position on the one hand, which increases the cutting width;
the cutting edges can not be optimally sharpened.
the invention is therefore based on the object to provide a simple and inexpensive to produce knife with improved cutting performance.
the inventive design the advantages in terms of a sharper cutting edge and pointing in the direction of movement of the knife edge portions of a serrated edge, without the disadvantages would be noted. Rather, the cutting edge of the knife according to the invention is symmetrical with respect to the median plane, wherein the cutting edge can be ground razor sharp on their vast area.
the recesses are particularly preferably rounded and placed so that the cutting edge is curved in a side view of the blade surface.
uniformly deep bends can be created by substantially uniform pits, however, for particular applications or to form cutting sections with special function, the bends can also become different depths.
a particular advantage of the embodiment according to the invention lies in the fact that it is also possible to form the cutting edge reciprocally in plan view, preferably also in a curved manner.
the crumb firmness Of knives greatly improved, which can be achieved for example a particularly smooth cut in bread.
the tip between the recesses makes it easier to scrape and cut particularly smooth surfaces, such as bread crust or the skin of fruits and vegetables.
Fig. 1 shows a knife 1, which is designed for cutting food, in particular as a household knife.
the knife 1 contains the usual knife handle 2, to which a cutting area in the form of a knife blade 3 of the usual outer shape is attached.
the knife blade 3 can be made of any material suitable for knives and preferably consists of a steel, rust-resistant and / or nachschleifbar.
the knife 1 is designed as a household knife, in particular as a bread knife, wherein the blade 3 has a sufficiently large length of for example 20 cm.
the invention is also applicable to other household knives having different blade shapes, straight or curved cutting edges and other dimensions, and cutting areas in the form of a disc knife, for example for bread slicing machines.
the blade 3, as well as Figs. 2 to 4 show two blade surfaces 3a and 3b, which are symmetrically opposite to each other on a median plane 4.
the two blade surfaces 3a and 3b in the illustrated embodiment include a wedge angle ⁇ between them, and converge in an imaginary vertex line 3c, which lies in the median plane 4.
the blade 3 is provided in the vicinity of the imaginary vertex line 3 c of the blade surfaces 3 a and 3 b with a cutting edge 5 having a serrated edge 6.
the serrated edge 6 extends almost over the entire longitudinal extent of the blade 3, wherein only a puncture region at the tip of the blade and a region in the vicinity of the handle 2 has a conventional straight cutting edge.
the arrangement of the serrated edge 6 can be changed and adapted to special cutting functions.
the serrated edge 6 contains a multiplicity of indentations 6a, 6b which are machined next to each other and alternately once in one knife surface 3a and then in the other knife surface 3b.
the recesses 6a, 6b are substantially identical in their dimensions along the apex edge 3c, the term "substantially” comprising unavoidable manufacturing variations that are unavoidable in such thinly ground materials.
the recesses 6a, 6b are immediately adjacent and alternately on opposite blade surfaces 3a, 3b.
each of the depressions 6a, 6b extends in the direction of the opposite blade surface 3b or 3a beyond the center plane 4 and through the opposite blade surface, so that tips 7 are formed between adjacent depressions 6a, 6b on the different blade surfaces 3a, 3b , which lie substantially in the median plane 4 and the imaginary vertex edge 3c, while the cutting edge 5 between two tips 7 first drops and then rises again.
the recess 6a is formed in the blade surface 3a so as to exit on the opposite blade surface 3b at a distance from the apex line 3c, which in the FIG Substantially corresponds to the distance with which the machined into the opposite blade surface 3b recess 6b on the blade surface 3a exits.
the recesses 6a and 6b are rounded, in the illustrated embodiment with a semicircular grinding tool, so that there is a semicircular boundary line 8 to the respective blade surface, and they have in the direction of the apex line 3c an increasing penetration depth in the blade surface.
rounded recesses 6a, 6b provide a curved or curving sloping and rising cutting edge 5 with arcs interrupted by tips 7 and curved away from the apex line 3c. Since the depressions 6a, 6b are arranged substantially identically and uniformly, since the depressions 6a, 6b continue to extend in each case substantially by the same amount over the center plane 4, the result is a substantially equal, identically shaped and by points 7 mutually separated sheets existing cutting edge 5, when viewed in side view of one of the blade surfaces 3a, 3b.
the serrated edge according to the invention can be provided only partially on the blade.
the depressions may have other shapes, for example, be formed as trapezoidal or V-shaped notches, which then leads to a substantially zigzag course of the cutting edge, both in plan view of the cutting edge and in side view of the blade surface.
the indentations need not necessarily be formed the same length over the entire length of the blade and on both blade surfaces and be equally spaced. It is also possible to leave between adjacent, arranged on different sides of the blade wells instead of the tips larger rectilinear portions of the cutting edge.
the wells can also be rounded with other uniform or composite radii, so that instead of the drawn arcuate boundary line to the respective blade surface, which leads to a circular arc shape of the cutting edge in plan view and side view, results in a part of an ellipse formed boundary line or a boundary line with a different shape.

Landscapes

Life Sciences & Earth Sciences (AREA)
Forests & Forestry (AREA)
Engineering & Computer Science (AREA)
Mechanical Engineering (AREA)
Knives (AREA)
Surgical Instruments (AREA)
Food-Manufacturing Devices (AREA)

EP03019863A 2003-09-01 2003-09-01 Messer Expired - Lifetime EP1510303B1 (de)

Priority Applications (7)

Application Number	Priority Date	Filing Date	Title
EP03019863A EP1510303B1 (de)	2003-09-01	2003-09-01	Messer
AT03019863T ATE345906T1 (de)	2003-09-01	2003-09-01	Messer
ES03019863T ES2275984T3 (es)	2003-09-01	2003-09-01	Cuchillo.
DE50305760T DE50305760D1 (de)	2003-09-01	2003-09-01	Messer
JP2004112440A JP3759943B2 (ja)	2003-09-01	2004-04-06	ナイフ
RU2004113297/02A RU2277468C2 (ru)	2003-09-01	2004-04-30	Нож
SG200402995A SG121888A1 (en)	2003-09-01	2004-05-28	Knife

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
EP03019863A EP1510303B1 (de)	2003-09-01	2003-09-01	Messer

Publications (2)

Publication Number	Publication Date
EP1510303A1 EP1510303A1 (de)	2005-03-02
EP1510303B1 true EP1510303B1 (de)	2006-11-22

Family

ID=34089653

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP03019863A Expired - Lifetime EP1510303B1 (de)	2003-09-01	2003-09-01	Messer

Country Status (7)

Country	Link
EP (1)	EP1510303B1 (es)
JP (1)	JP3759943B2 (es)
AT (1)	ATE345906T1 (es)
DE (1)	DE50305760D1 (es)
ES (1)	ES2275984T3 (es)
RU (1)	RU2277468C2 (es)
SG (1)	SG121888A1 (es)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
GB2483674A (en) *	2010-09-15	2012-03-21	David Jennings	A knife for wiping a surface
JP5924094B2 (ja)	2012-04-18	2016-05-25	新明和工業株式会社	刃物、その製造方法およびそれを製造するためのプラズマ装置
JP5914611B2 (ja) *	2014-10-06	2016-05-11	アーネスト株式会社	刃物
JP2017079939A (ja) *	2015-10-26	2017-05-18	株式会社富田刃物	刃物類
SI25693A (sl) *	2018-08-24	2020-02-28	PIĹ EK - VITLI KRPAN, d.o.o.	Rezalna glava za bager ali gozdarski stroj
CN218195311U (zh) *	2022-09-26	2023-01-03	武汉苏泊尔炊具有限公司	刀具

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
BE524324A (es) *
GB247768A (en) *	1925-03-27	1926-02-25	Ernest North	Improvements relating to knives for cutting bread, or for other uses
GB322398A (en) *	1929-02-16	1929-12-05	William Grant	Improvements in or relating to knife blades
US1911974A (en) *	1931-06-03	1933-05-30	Remington Arms Co Inc	Method of producing serrated edges
US2112271A (en) *	1934-12-22	1938-03-29	American Safety Razor Corp	Pile wire
US2555735A (en) *	1947-04-19	1951-06-05	Estabrooks Norman Lewis	Knife having a serrated edge
GB2113137A (en) *	1981-12-12	1983-08-03	Wilkinson Sword Ltd	Knives

2003
- 2003-09-01 AT AT03019863T patent/ATE345906T1/de active
- 2003-09-01 DE DE50305760T patent/DE50305760D1/de not_active Expired - Lifetime
- 2003-09-01 ES ES03019863T patent/ES2275984T3/es not_active Expired - Lifetime
- 2003-09-01 EP EP03019863A patent/EP1510303B1/de not_active Expired - Lifetime
2004
- 2004-04-06 JP JP2004112440A patent/JP3759943B2/ja not_active Expired - Lifetime
- 2004-04-30 RU RU2004113297/02A patent/RU2277468C2/ru active
- 2004-05-28 SG SG200402995A patent/SG121888A1/en unknown

Also Published As

Publication number	Publication date
SG121888A1 (en)	2006-05-26
ATE345906T1 (de)	2006-12-15
JP3759943B2 (ja)	2006-03-29
DE50305760D1 (de)	2007-01-04
RU2277468C2 (ru)	2006-06-10
EP1510303A1 (de)	2005-03-02
JP2005074221A (ja)	2005-03-24
RU2004113297A (ru)	2005-10-27
ES2275984T3 (es)	2007-06-16

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