EP0220362B1 - Couteaux - Google Patents

Couteaux Download PDF

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Publication number
EP0220362B1
EP0220362B1 EP86104733A EP86104733A EP0220362B1 EP 0220362 B1 EP0220362 B1 EP 0220362B1 EP 86104733 A EP86104733 A EP 86104733A EP 86104733 A EP86104733 A EP 86104733A EP 0220362 B1 EP0220362 B1 EP 0220362B1
Authority
EP
European Patent Office
Prior art keywords
serrations
cutting edge
knife
inch
interruptions
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
Application number
EP86104733A
Other languages
German (de)
English (en)
Other versions
EP0220362A1 (fr
Inventor
Jerome Samuel Hahn
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.)
Richardson Sheffield Ltd
Original Assignee
Richardson Sheffield Ltd
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 Richardson Sheffield Ltd filed Critical Richardson Sheffield Ltd
Priority to AT86104733T priority Critical patent/ATE45118T1/de
Publication of EP0220362A1 publication Critical patent/EP0220362A1/fr
Application granted granted Critical
Publication of EP0220362B1 publication Critical patent/EP0220362B1/fr
Expired legal-status Critical Current

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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

  • This invention relates to knives, and is particularly, though not necessarily exclusively concerned with domestic knives such as would be used, e.g., in the kitchen.
  • a construction embodying edge formations in the form of serrations and/or scallops is described and claimed in GB-A 2 108 887, where a blade has a V-shaped cutting edge, centrally located on a parallel- sided blank, the cutting edge being flat ground to one side of the Vee and ground with formations to the opposite side of the Vee.
  • Such a construction has proved to be most effective in providing an exceedingly sharp cutting edge that retains its sharpness for considerable periods, and can be resharpened.
  • the object of the present invention is to provide still further improvements to a knife blade of the type defined above.
  • a knife comprises a blade having formations at its cutting edge to assist the cutting action, said edge being V-shaped and centrally located on a parallel sided blank, and being flat ground to one side of the Vee and ground with formations to the opposite side of the Vee, there being a number of interruptions to the formations, in spaced relationship along the length of the cutting edge.
  • the interruptions can take the form of areas where no formations are provided, or can take the form of a number of single large serrations.
  • the interruptions add noticeably to the strength of the cutting edge at the tip of the Vee, assisting considerably in the prevention of flexing of the blade at the tip of the Vee as can occur particularly when cutting relatively tough materials.
  • Both types of formations also assist in clearing debris from the bottom of the cut being produced by the blade.
  • Interruptions in the form of single large serrations have the still further advantage of providing a buffer between the material being cut and the cutting edge immediately alongside each large serration that gives protection to the cutting edge to maintain the sharpness of the cutting edge, but without impairing the cutting action.
  • the formations are scallops and/or serrations.
  • the invention utilises conventional parallel sided blanks, and has a centrally located cutting edge, with the grinding of edge formations to one side only.
  • Such a blade therefore, combines relatively low costs of production with the retention of improved cutting performance.
  • the angle of the V-shaped cutting edge, and the scallops and/or serrations ground to one side of the V- shaped cutting edge have a marked effect on the cutting performance of the blade. It is therefore a prefered embodiment of the present invention that the V-shaped cutting edge has an included angle between 14 ° and 30 ° . Preferably the included angle lies between 16 ° and 22°, it being further preferred that the included angle lies between 18° and 20 ° .
  • serrations are ground to one side of the V-shaped cutting edge, there being from 25 to 50 serrations per inch and preferably 40 serrations per inch, between the interruptions, it being further preferred that the included angle of the serrations lies between 80 ° and 100° and still further preferably 90 ° .
  • great care has to be taken to produce serrations which, when viewed from the flat ground side of the blank, only marginally protrude above the general level of the edge of the blade. Because the V-shaped cutting edge is flat ground to one side, and the serrations only protrude marginally, the knife can be resharpened by regrinding by hand or otherwise, the flat ground surface of the V-shaped cutting edge.
  • scallops can be ground on the same side of the V-shaped cutting edge.
  • one scallop can be provided between adjacent, spaced interruptions, e.g. having a radius in the range 0.1" to 0.25". Preferably the radius is 0.16".
  • the scallops may have pitch in the range 2.0 to 10 and preferably 5 T.P.I. (teeth per inch).
  • the serrations when scallops are present, have an included angle between 50 ° and 90°, with a still further preference of 60°. When a heavier cutting action is required, e.g.
  • a single scallop can be provided between spaced interruptions, and when the scallops can have a radius of 0.15 to 0.5 inch, and preferably 0.25 inch, with a scallop pitch between 1.0 and 6.0 T.P.I. and preferably 4 T.P.I., and where the serrations may be between 25 and 50 T.P.I. and preferably 33 T.P.I.
  • More than one scallop can be provided between spaced interruptions.
  • two scallops can be provided between spaced interruptions, and which may each have, at the cutting edge, a radius in the range 0.625 inch to 1.25 inch and preferably 0.75 inch, and a scallop pitch in the range 1 to 4 T.P.I. and preferably 2 T.P.I.
  • the serrations can be either as has been mentioned above in relation to the serrated only construction or as the single scallop general purpose embodiment.
  • a knife 1 has a blade 2 with parallel sides 3 and a centrally located "V"-shaped cutting edge 4 flat ground to one side 5 and ground with serrations 6 to the other side.
  • the "V"-shaped cutting edge has an included angle between 14 ° and 30°, preferably 18 ° to 20 ° and the serrations are in the range 25 to 50 per inch, preferably 40 per inch.
  • the included angle of the serrations at the cutting edge is between 80 ° and 100 ° , preferably 90 ° .
  • a number of spaced interruptions 7 are formed, in this embodiment by leaving a portion of that side of the "V"-shaped cutting edge unserrated.
  • the presence of the unserrated portions or interruptions 7 adds noticeably to the strength of the cutting edge at the tip of the Vee, and provides considerable assistance in preventing any flexing of the blade at the very tip of the cutting edge particularly when cutting relatively tough materials.
  • the knife 1 has a blade 2 with parallel sides 3 and a central V-shaped cutting edge 4 flat ground to one side 5 and formed with serrations 6 to the other side (and is in this regard essentially similar to the construction shown in Figure 3).
  • that side of the V-shaped cutting edge is ground with scallops 8, each having a radius at the cutting edge between 0.625 inch and 1,25 inch preferably 0.75 inch, and a pitch in the range 1 to 4 and preferably 2 T.P.I.
  • the serrations 6 have an included angle between 50 and 90 ° , preferably 60 ° .
  • the interruptions spaced along the length of the central V-shaped cutting edge take the form of large single serrations 9. Adjacent serrations 9 are separated by two scallops.
  • Figures 6 and 7 show a third embodiment suited to use as a bread knife, and here again, for convenience, the reference numerals of Figures 1 to 3 have been retained for like parts.
  • the knife 1 has a blade 2 with parallel sides 3 and a central V-shaped cutting edge 4, flat ground to one side 5 and formed with serrations 6 to the other side.
  • the serrated side of the V-shaped cutting edge being ground with scallops 10.
  • large serrations 11 are provided, there being a single scallop 10 between adjacent large serrations.
  • the scallops have a radius at the cutting edge in the range 0.15 inch to 0.5 inch and preferably 0.25, and a scallop pitch in the range 1.0 to 6 T.P.I., preferably 4 T.P.I.
  • the serrations 6 are preferably in the range 25 to 50 T.P.J. and further preferably, 33 T.P.I.
  • Figures 8 and 9 show a fourth embodiment suited for use as a general purpose knife.
  • the reference numerals of Figures 1 to 3 have been retained for like parts.
  • a knife 1 has a blade 2 with parallel sides 3 and a central V-shaped cutting edge 4 flat ground to one side 5 and formed with serrations 6 to the other side.
  • the serrated side of the cutting edge is formed with scallops 12, and along the length of the cutting edge, large serrations 13 are provided with a single scallop between adjacent large serrations 13.
  • the scallops have a radius in the range 0.1 inch to 0.25 inch, and more preferably 0.16 inch, and a pitch in the range 2 to 10 T.P.I., more preferably 5 T.P.I., the serrations having an included angle between 50° and 90°, more preferably 60 ° .
  • the large serrations 9 and 11 add noticeably to the strength of the blade, and are of considerable assistance in preventing flexing at the tip of the V-shaped cutting edge.
  • the large serrations 9 and 11 have the additional advantage of providing a buffer between the material being cut and the serrations 6 immediately alongside the serrations 9 and 11 that give protection to the cutting edge without impairing the cutting action, and are effective in clearing debris from the bottom of the cut being produced.

Landscapes

  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Knives (AREA)
  • Surgical Instruments (AREA)
  • Confectionery (AREA)
  • Thermal Transfer Or Thermal Recording In General (AREA)
  • Eye Examination Apparatus (AREA)
  • Cleaning In Electrography (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Steroid Compounds (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)

Claims (11)

1. Couteau comprenant une lame (2) possédant des formations (6, 8) sur son tranchant pour aider l'action de coupe, le tranchant étant en forme de V et positionné centralement sur une ébauche à côtés parallèles, et étant meulé plat sur un côté (5) du V et meulé avec des formations (6, 8) sur le côté opposé du V, caractérisé en ce qu'il existe un certain nombre d'interruptions (7, 9) des formations (6, 8), interruptions qui sont espacées sur la longueur du tranchant.
2. Couteau selon la revendication 1, caractérisé en ce que les interruptions (7) prennent la forme de zones exemptes de formations.
3. Couteau selon la revendication 1, caractérisé en ce que les interruptions (9) prennent la forme d'un certain nombre de larges dentelures uniques.
4. Couteau selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les formations (6) sont en forme de dentelures.
5. Couteau selon l'une quelconque des revendications 1 à 3, caractérisé en ce que les formations sont en formes de dentelures (6) combinées avec des échancrures (8), les dentelures présentant un angle de dégagement de 60°.
6. Couteau selon la revendication 1, caractérisé en ce que le tranchant en forme de V positionné centralement présente un angle de dégagement compris entre 14° et 30°, et de préférence entre 18° et 20°.
7. Couteau selon la revendication 4, caractérisé en ce qu'il y a de 25 à 50 dentelures (6) par 25,4 mm (pouce), et de préférence 40, et les dentelures (6) présentent un angle de dégagement compris entre 80° et 100°, et de préférence égal à 90°
8. Couteau selon la revendication 5, caractérisé en ce qu'une échancrure (8) est prévue entre des interruptions espacées (9), les échancrures présentant un rayon compris entre 2,54 mm et 6,35 mm (0,1 et 0,25 pouce), et de préférence égal à 4,06 mm (0,16 pouce), et un pas compris entre 2 et 10 dents par 25,4 mm (pouce), et de préférence égal à 5 dents par 25,4 mm (pouce).
9. Couteau selon la revendication 5, caractérisé en ce que les dentelures (6) présentent un angle de dégagement compris entre 50° et 900 .
10. Couteau selon la revendication 5, caractérisé en ce qu'une seule échancrure est prévue entre des interruptions espacées (9), et présente un rayon compris entre 3,81 mm et 12,7 mm (0,15 et 0,5 pouce), et de préférence égal à 6,35 mm (0,25 pouce), avec un pas d'échancrure compris entre 1 et 6 dents par 25,4 mm (pouce), et de préférence égal à 4 dents par 25,4 mm (pouce), et les dentelures étant en un nombre compris entre 25 et 50 dents par 25,4 mm (pouce), et de préférence égal à 33 dents par 25,4 mm (pouce).
11. Couteau selon la revendication 5, caractérisé en ce que deux échancrures (8) sont prévues entre des interruptions espacées (9), les échancrures (8) présentant un rayon sur le tranchant compris entre 15,87 mm et 31,75 mm (0,625 et 1,25 pouce), et de préférence égal à 19,05 mm (0,75 pouce), et un pas compris entre 1 et 4 dents par 25,4 mm (pouce), et de préférence égal à 2 dents par 25,4 mm (pouce).
EP86104733A 1985-10-18 1986-04-07 Couteaux Expired EP0220362B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86104733T ATE45118T1 (de) 1985-10-18 1986-04-07 Messer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8525762 1985-10-18
GB858525762A GB8525762D0 (en) 1985-10-18 1985-10-18 Knives

Publications (2)

Publication Number Publication Date
EP0220362A1 EP0220362A1 (fr) 1987-05-06
EP0220362B1 true EP0220362B1 (fr) 1989-08-02

Family

ID=10586897

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86104733A Expired EP0220362B1 (fr) 1985-10-18 1986-04-07 Couteaux

Country Status (14)

Country Link
EP (1) EP0220362B1 (fr)
JP (1) JPS6294189A (fr)
AT (1) ATE45118T1 (fr)
AU (1) AU576292B2 (fr)
BR (1) BR8603563A (fr)
CA (1) CA1276441C (fr)
DE (1) DE3664743D1 (fr)
DK (1) DK163348C (fr)
ES (4) ES296608Y (fr)
FI (1) FI861657A (fr)
GB (1) GB8525762D0 (fr)
HK (1) HK30790A (fr)
NO (1) NO170797C (fr)
PT (1) PT82925B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023019114A1 (fr) * 2021-08-10 2023-02-16 Brothers Brands, Inc. Lame de couteau

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04368U (fr) * 1990-04-17 1992-01-06
FR2732920B1 (fr) * 1995-04-13 1997-07-11 Andre Verdier Sa Ets Microdenture pour lame d'outil tranchant, couteau notamment
GB2318318B (en) * 1996-07-18 1998-11-04 Long Shye Enterprise Co Ltd Knife blade
KR102592627B1 (ko) * 2020-08-27 2023-10-23 김진우 처마 빗물받침장치

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB257465A (en) * 1925-12-05 1926-09-02 John Thomas Gillott Improvements in or relating to knives
US2059414A (en) * 1935-10-17 1936-11-03 William P Taylor Crumbless bread knife
GB2108887B (en) * 1981-01-31 1984-07-04 Westall Richardson Limited Knives

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023019114A1 (fr) * 2021-08-10 2023-02-16 Brothers Brands, Inc. Lame de couteau
USD1015824S1 (en) 2021-08-10 2024-02-27 Brothers Brands, Inc. Knife blade

Also Published As

Publication number Publication date
EP0220362A1 (fr) 1987-05-06
ES296354Y (es) 1988-03-16
NO864164D0 (no) 1986-10-17
DK163348C (da) 1992-07-13
ES296356Y (es) 1988-03-16
NO170797C (no) 1992-12-09
AU5577586A (en) 1987-04-30
BR8603563A (pt) 1987-06-02
AU576292B2 (en) 1988-08-18
HK30790A (en) 1990-04-27
GB8525762D0 (en) 1985-11-20
ES296354U (es) 1987-08-16
NO170797B (no) 1992-08-31
JPS6294189A (ja) 1987-04-30
ES296608Y (es) 1988-05-16
DK163348B (da) 1992-02-24
PT82925A (pt) 1986-08-01
FI861657A (fi) 1987-04-19
DK498986A (da) 1987-04-19
ES296355U (es) 1987-08-16
DK498986D0 (da) 1986-10-17
CA1276441C (fr) 1990-11-20
ES296355Y (es) 1988-03-16
ATE45118T1 (de) 1989-08-15
DE3664743D1 (en) 1989-09-07
ES296356U (es) 1987-08-16
PT82925B (pt) 1992-07-31
ES296608U (es) 1987-12-01
NO864164L (no) 1987-04-21
FI861657A0 (fi) 1986-04-18

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