EP0429035B1 - Knife with sintered bolster - Google Patents
Knife with sintered bolster Download PDFInfo
- Publication number
- EP0429035B1 EP0429035B1 EP90122067A EP90122067A EP0429035B1 EP 0429035 B1 EP0429035 B1 EP 0429035B1 EP 90122067 A EP90122067 A EP 90122067A EP 90122067 A EP90122067 A EP 90122067A EP 0429035 B1 EP0429035 B1 EP 0429035B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bolster
- blade
- tang
- knife
- sintered
- 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
- 239000000463 material Substances 0.000 claims description 11
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 206010018498 Goitre Diseases 0.000 description 11
- 201000003872 goiter Diseases 0.000 description 11
- 238000003466 welding Methods 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 241000219495 Betulaceae Species 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 230000007704 transition Effects 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
- B26B3/00—Hand knives with fixed blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B3/00—Hand knives with fixed blades
- B26B3/02—Table-knives
Definitions
- the invention relates to a knife consisting of a leaf, goiter and tang, in which the tang and leaf are welded to opposite flat surfaces of the goiter and consist of steel.
- Such a knife is known from US-A 689 049 or FR-A 694 520. Both writings describe a knife in which the leaf, bolster and tang are forged separately, possibly made of different materials, and then welded together. Compared to the classic production method - forging a blade consisting of a blade, tang and goiter in one piece - this solution significantly reduces the production costs.
- the three components have considerable differences in their cross-sectional area, so that in the classic production method the largest cross-sectional area is decisive for the choice of the blank and the shaping of the areas with a smaller cross section is very complex.
- Reworking such as polishing or the like, is particularly time-consuming because of the often complicated shape.
- the object of the invention is therefore to design a generic knife in such a way that the manufacture is considerably simplified with the same utility value.
- a knife is provided in which, due to the precise manufacture of the bolster designed as a sintered part, the bolster has a very high surface quality even without reworking.
- the fit of plastic handles to be attached later to the sintered part is so good that there is no longer any need for reworking, as is otherwise the case with forged parts.
- the use of a sintered part offers particular advantages.
- the function of the goiter as a link between tang and the sheet made of hardened steel is used to advantage here.
- compression occurs on the sintered part in the area of the weld due to the high pressure and the heating during flash butt welding. This results in an increase in hardness in the sintered part of a few millimeters.
- the hardness curve in the entire blade does not change suddenly, but continuously at the goiter / blade transition point.
- the knife blade here that of a chef's knife, consists of the blade 1, the bolster 2 and the tang 3.
- Leaf, bolster and tang are each formed as individual parts welded together, the bolster consisting of a sintered part.
- the bolster 2 has a material accumulation that is several times the leaf thickness.
- the thickness of the bolster tapers in the direction of section 5 via a concave groove 6.
- the profile of this section 5 corresponds to that of blade 1 and thus forms a flat blade attachment surface 5 '.
- the approach 5 of the bolster 2 tapers in a wedge shape in the direction of the cotton wool 1 '.
- the bolster is also designed symmetrically, the bolster thickening in the direction of the alve attachment surface 5 ′′ via said concave groove 6 to a multiple of the blade thickness to the flat alder attachment surface 5 ′′.
- the tang 3 is butt-connected to the bolster by means of fusion welding, perpendicular to the plane tang surface 5 '' of the bolster.
- the hardness curve of the material of a blade formed in this way is plotted in FIG. 6. While the leaf is made of hardened material, goiter and tang are made of softer material. At the welding point A, where the blade and bolster are connected to one another, the sintered material of the bolster has a higher hardness in the range of a few millimeters. The reason for this increase in hardness is the flash butt welding process used. The sintered material is compressed due to the pressure exerted in this process and the heating in the area of the weld. In this area, the hardness increases continuously from the crop to the leaf. Goiter and tang on the welded joint B show a slight increase in hardness, the tang being hardened in a larger area than the goiter. Due to the high accuracy of fit of the sintered bolster and stitching body, it is not necessary to rework the bolster. Only the connection between bolster and blade on weld A requires reworking.
Description
Die Erfindung betrifft ein aus Blatt, Kropf und Erl bestehendes Messer, bei welchem Erl und Blatt an gegenüberliegenden Planflächen des Kropfes angeschweißt sind und aus Stahl bestehen.The invention relates to a knife consisting of a leaf, goiter and tang, in which the tang and leaf are welded to opposite flat surfaces of the goiter and consist of steel.
Ein derartiges Messer ist aus der US-A 689 049 oder der FR-A 694 520 bekannt. Beide Schriften beschreiben ein Messer, bei welchem Blatt, Kropf und Erl getrennt voneinander, unter Umständen auch aus unterschiedlichem Material, geschmiedet werden und dann zusammengeschweißt werden. Gegenüber der klassischen Herstellungsweise - Schmieden von Klinge, bestehend aus Blatt, Erl und Kropf in einem Stück - reduziert diese Lösung erheblich die Herstellungskosten. Die drei Bestandteile weisen in ihrer Querschnittsfläche erhebliche Unterschiede auf, so daß bei der klassischen Herstellungsweise die größte Querschnittsfläche für die Wahl des Rohlings maßgeblich ist und das Formen der querschnittsgeringeren Bereiche sehr aufwendig ist. Außerdem müssen wegen der verfahrensbedingten unpräzisen Fertigung der einzelnen Bestandteile nach dem Zusammenschweißen noch erhebliche Nacharbeiten erfolgen. Gerade beim Kropf sind Nacharbeiten, wie Polieren oder ähnliches, wegen der oft komplizierten Formgebung sehr aufwendig.Such a knife is known from US-A 689 049 or FR-A 694 520. Both writings describe a knife in which the leaf, bolster and tang are forged separately, possibly made of different materials, and then welded together. Compared to the classic production method - forging a blade consisting of a blade, tang and goiter in one piece - this solution significantly reduces the production costs. The three components have considerable differences in their cross-sectional area, so that in the classic production method the largest cross-sectional area is decisive for the choice of the blank and the shaping of the areas with a smaller cross section is very complex. In addition, due to the process-related imprecise manufacture of the individual components after welding, considerable rework must still be carried out. Reworking, such as polishing or the like, is particularly time-consuming because of the often complicated shape.
Aufgabe der Erfindung ist es daher, ein gattungsgemäßes Messer so auszugestalten, daß bei gleichem Gebrauchswert die Herstellung erheblich vereinfacht wird.The object of the invention is therefore to design a generic knife in such a way that the manufacture is considerably simplified with the same utility value.
Gelöst ist diese Aufgabe durch die kennzeichnenden Merkmale des Ansprüches 1. Die Unteransprüche beschreiben vorteilhafte Weiterbildungen.This object is achieved by the characterizing features of
Zufolge solcher Ausgestaltung ist ein Messer gegeben, bei dem aufgrund der präzisen Fertigung des als Sinterteil ausgebildeten Kropfes letzterer auch ohne Nacharbeiten eine sehr hohe Oberflächenqualität aufweist. Auch das Paßvermögen von später anzubringenden Kunststoffgriffen zum Sinterteil ist so gut, daß auch dort keine - wie bei an Schmiedeteilen sonst unvermeidbaren - Nacharbeiten mehr notwendig sind.As a result of such an embodiment, a knife is provided in which, due to the precise manufacture of the bolster designed as a sintered part, the bolster has a very high surface quality even without reworking. The fit of plastic handles to be attached later to the sintered part is so good that there is no longer any need for reworking, as is otherwise the case with forged parts.
Weiterhin wird das Verschweißen mit Erl und Klinge aufgrund der durch die hohe Formpräzision gewährleisteten besseren Justierung erheblich vereinfacht.Furthermore, the welding with tang and blade is considerably simplified due to the better adjustment guaranteed by the high shape precision.
Beim Verschweißen von Material geringer Härte mit Material höherer Härte bietet die Verwendung eines Sinterteils besondere Vorteile. Die Funktion des Kropfes als Bindeglied zwischen Erl und dem aus gehärtetem Stahl bestehenden Blatt wird hier vorteilhaft ausgenutzt. Beim Aneinanderschweißen von Blatt und Kropf tritt aufgrund des hohen Druckes und der Erwärmung beim Abbrennstumpfschweißen am Sinterteil im Bereich der Schweißstelle eine Verdichtung auf. Hieraus resultiert eine Härtezunahme im Sinterteil über einige Millimeter. Der Härteverlauf in der gesamten Klinge ändert sich an der Übergangsstelle Kropf/Klinge nicht sprungartig, sondern kontinuierlich.When welding low hardness material with higher hardness material, the use of a sintered part offers particular advantages. The function of the goiter as a link between tang and the sheet made of hardened steel is used to advantage here. When the sheet and bolster are welded together, compression occurs on the sintered part in the area of the weld due to the high pressure and the heating during flash butt welding. This results in an increase in hardness in the sintered part of a few millimeters. The hardness curve in the entire blade does not change suddenly, but continuously at the goiter / blade transition point.
Weitere Einzelheiten sind nachstehend anhand eines zeichnerisch veranschaulichten Ausführungsbeispiel der Erfindung erläutert. Es zeigt:
- Fig. 1
- die Messerklinge in Seitenansicht,
- Fig. 2
- die durch schweißtechnisches Verbindungen zur Messerklinge gemäß Fig. 1 führenden Einzeltei le, nämlich Blatt, Kropf und Erl, ebenfalls in Seitenansicht,
- Fig. 3
- den Schnitt gemäß Linie III-III in Fig. 1,
- Fig. 4
- Kropf in perspektivischer Wiedergabe,
- Fig. 5
- Erl in perspektivischer Wiedergabe und
- Fig. 6
- Härteverlaufsmessung an Kochmessern mit Sinterkropf (Mittelwert von 5 Messungen).
- Fig. 1
- the knife blade in side view,
- Fig. 2
- the individual parts leading through welding connections to the knife blade according to FIG. 1 le, namely leaf, goiter and tang, also in side view,
- Fig. 3
- the section along line III-III in Fig. 1,
- Fig. 4
- Goiter in perspective,
- Fig. 5
- Erl in perspective and
- Fig. 6
- Hardness progression measurement on chef's knives with sintered goiter (average of 5 measurements).
Die Messerklinge, hier die eines Kochmessers, besteht aus dem Blatt 1, dem Kropf 2 und dem Erl 3. Blatt, Kropf und Erl sind jeweils als miteinander verschweißte Einzelteile ausgebildet, wobei der Kropf aus einem Sinterteil besteht.The knife blade, here that of a chef's knife, consists of the
Während das Blatt 1 und der Erl 3 relativ flach gestaltet, also beispielsweise aus einem Streifen ausgestanzt sind, weist der Kropf 2 eine das Mehrfache der Blattdikke besitzende Materialanhäufung auf. Die Dicke des Kropfes verjüngt sich in Richtung des Abschnittes 5 hin über eine konkave Auskehlung 6. Das Profil dieses Abschnittes 5 entspricht dem des Blattes 1 und formt so eine plane Klingenansatzfläche 5'. In Richtung der Messerwatte 1' hin verjüngt sich der Ansatz 5 des Kropfes 2 keilförmig.While the
Bezüglich der Symmetrieebene des Blatte 1 ist auch der Kropf symmetrisch gestaltet, wobei der Kropf sich in Richtung Erlbefestigungsfläche 5'' über die besagte konkave Auskehlung 6 auf ein Mehrfaches der Blattstärke zur planen Erlansatzfläche 5'' hin verdickt.With respect to the plane of symmetry of the
Die plane Stirnfläche 1' des Blattes 1 und die Blattansatzfläche 5' des Ansatzes 5 des Kropfes 2 stoßen beim Verschweißen von Blatt und Kropf aufeinander. Beide Teile sind mittels Abbrennstumpfschweißen miteinander verbunden. Der Erl 3 ist mit seiner Stirnfläche 3' senkrecht auf der planen Erlansatzfläche 5'' des Kropfes stoßend mittels Schmelzschweißen mit dem Kropf verbunden.The flat end face 1 'of the
Der Härteverlauf des Materials einer so gebildeten Klinge ist in Fig. 6 aufgetragen. Während das Blatt aus gehärtetem Material besteht, sind Kropf und Erl aus weicherem Material. An der Schweißstelle A, wo Blatt und Kropf miteinander verbunden sind, weist das Sintermaterial des Kropfes im Bereich einiger Millimeter eine höhere Härte auf. Ursache für diese Härtezunahme ist das verwendete Abbrennstumpfschweißverfahren . Das Sintermaterial wird wegen des bei diesem Verfahren ausgeübten Druckes und der Erhitzung im Bereich der Schweißstelle verdichtet. In diesem Bereich steigt die Härte vom Kropf hin zum Blatt kontinuierlich an. Kropf und Erl weisen an der schmelzgeschweißte Verbindung B eine leichte Zunahme der Härte auf, wobei der Erl in einem größeren Bereich aufgehärtet ist als der Kropf. Wegen der hohen Paßgenauigkeit von gesintertem Kropf und Heftkörper ist ein Nacharbeiten des Kropfes nicht erforderlich. Nur die Verbindung zwischen Kropf und Blatt an der Schweißnaht A erfordert ein Nacharbeiten.The hardness curve of the material of a blade formed in this way is plotted in FIG. 6. While the leaf is made of hardened material, goiter and tang are made of softer material. At the welding point A, where the blade and bolster are connected to one another, the sintered material of the bolster has a higher hardness in the range of a few millimeters. The reason for this increase in hardness is the flash butt welding process used. The sintered material is compressed due to the pressure exerted in this process and the heating in the area of the weld. In this area, the hardness increases continuously from the crop to the leaf. Goiter and tang on the welded joint B show a slight increase in hardness, the tang being hardened in a larger area than the goiter. Due to the high accuracy of fit of the sintered bolster and stitching body, it is not necessary to rework the bolster. Only the connection between bolster and blade on weld A requires reworking.
Die in der vorstehenden Beschreibung, der Zeichnung und den Ansprüchen offenbarten Merkmale der Erfindung können sowohl einzeln als auch in beliebiger Kombination für die Verwirklichung der Erfindung von Bedeutung sein. Alle offenbarten Merkmale sind erfindungswesentlich. In die Offenbarung der Anmeldung wird hiermit auch der Offenbarungsinhalt der zugehörigen/beigefügten Prioritätsunterlagen (Abschrift der Voranmeldung) vollinhaltlich mit einbezogen.The features of the invention disclosed in the above description, the drawing and the claims can be of importance both individually and in any combination for the implementation of the invention. All disclosed features are essential to the invention. The disclosure of the application is hereby also the Disclosure content of the associated / attached priority documents (copy of the pre-registration) included in full.
Claims (1)
- Knife consisting of blade (1), bolster (2) and tang (3), in which tang and blade are welded onto opposed plane surfaces of the bolster and made of steel, characterised by a sintered steel bolster (2) which has approximately the same hardness as the material of the tang (3), which hardness is less than that of the blade material, wherein this bolster has a continuous hardness gradient in the region of the junction between bolster (2) and blade (1), and wherein the weld joint betwen blade and bolster is a flash butt weld joint.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE8913822U DE8913822U1 (en) | 1989-11-23 | 1989-11-23 | |
| DE8913822U | 1989-11-23 | ||
| DE9014912U DE9014912U1 (en) | 1989-11-23 | 1990-10-29 | |
| DE9014912U | 1990-10-29 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0429035A2 EP0429035A2 (en) | 1991-05-29 |
| EP0429035A3 EP0429035A3 (en) | 1991-10-02 |
| EP0429035B1 true EP0429035B1 (en) | 1993-05-12 |
Family
ID=25955556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90122067A Expired - Lifetime EP0429035B1 (en) | 1989-11-23 | 1990-11-19 | Knife with sintered bolster |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US5131152A (en) |
| EP (1) | EP0429035B1 (en) |
| DE (2) | DE9014912U1 (en) |
| ES (1) | ES2041105T3 (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7228632B2 (en) * | 2002-05-31 | 2007-06-12 | Calphalon Corporation | Cutlery implement |
| US20040123471A1 (en) * | 2002-08-07 | 2004-07-01 | Onion Kenneth J. | Ergonomic knife |
| US20060117576A1 (en) * | 2004-12-03 | 2006-06-08 | Calphalon Corporation | Cutlery implement |
| US7322113B2 (en) * | 2004-12-03 | 2008-01-29 | Calphalon Corporation | Cutlery implement and block |
| DE102005005640A1 (en) | 2005-02-05 | 2006-09-14 | Zwilling J. A. Henckels Ag | Knife with compression-forged knife drip |
| US20060207110A1 (en) * | 2005-03-03 | 2006-09-21 | Kyocera Corporation | Ceramic cutting knife |
| CA2763675A1 (en) | 2009-05-27 | 2010-12-02 | Wki Holding Company, Inc. | Cutlery having improved gripping ergonomics |
| US8839524B2 (en) * | 2010-10-01 | 2014-09-23 | Dwaine Owens | Scraper chef knife |
| CN104191420B (en) * | 2014-08-19 | 2016-05-04 | 李有维 | The welding method of handle of a knife and this handle of a knife and cutter hub |
| US10350770B1 (en) * | 2018-03-11 | 2019-07-16 | Evergood Hardware Products Co., Ltd. | Pattern knife assembly |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US689049A (en) * | 1901-08-07 | 1901-12-17 | Isaac Hirsch | Table-cutlery. |
| FR392047A (en) * | 1908-07-06 | 1908-11-16 | J Delaire Et Fils Soc | New manufacture of knife blades with bolsters or scales, by means of autogenous welding |
| FR694520A (en) * | 1930-04-25 | 1930-12-04 | Knife | |
| FR727607A (en) * | 1931-12-03 | 1932-06-21 | Knife and knife manufacturing process obtained by this process | |
| JPS5428823B2 (en) * | 1974-01-25 | 1979-09-19 | ||
| DE2526589A1 (en) * | 1975-06-13 | 1976-12-30 | Eickhorn Rolf Juergen Dipl Wir | METHOD OF MANUFACTURING KNIVES WITH HOLLOW HANDLE AND KNIVES MANUFACTURED AFTER THAT |
-
1990
- 1990-10-29 DE DE9014912U patent/DE9014912U1/de not_active Expired - Lifetime
- 1990-11-19 ES ES199090122067T patent/ES2041105T3/en not_active Expired - Lifetime
- 1990-11-19 DE DE9090122067T patent/DE59001443D1/en not_active Expired - Fee Related
- 1990-11-19 EP EP90122067A patent/EP0429035B1/en not_active Expired - Lifetime
-
1991
- 1991-04-19 US US07/688,912 patent/US5131152A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0429035A3 (en) | 1991-10-02 |
| ES2041105T3 (en) | 1993-11-01 |
| US5131152A (en) | 1992-07-21 |
| DE59001443D1 (en) | 1993-06-17 |
| DE9014912U1 (en) | 1991-03-28 |
| EP0429035A2 (en) | 1991-05-29 |
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