EP0128032A2 - Schneideklinge - Google Patents

Schneideklinge Download PDF

Info

Publication number
EP0128032A2
EP0128032A2 EP84303720A EP84303720A EP0128032A2 EP 0128032 A2 EP0128032 A2 EP 0128032A2 EP 84303720 A EP84303720 A EP 84303720A EP 84303720 A EP84303720 A EP 84303720A EP 0128032 A2 EP0128032 A2 EP 0128032A2
Authority
EP
European Patent Office
Prior art keywords
blade
scallop
scallops
asymmetric
cutting
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.)
Withdrawn
Application number
EP84303720A
Other languages
English (en)
French (fr)
Other versions
EP0128032A3 (de
Inventor
Geoffrey Robinson
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.)
Prestige Group UK PLC
Original Assignee
Prestige Group UK PLC
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 Prestige Group UK PLC filed Critical Prestige Group UK PLC
Publication of EP0128032A2 publication Critical patent/EP0128032A2/de
Publication of EP0128032A3 publication Critical patent/EP0128032A3/de
Withdrawn legal-status Critical Current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 blades and particularly though not exclusively to blades for hand knives.
  • Smooth edged blades having a single substantially straight ground edge have been known for many years and are used particularly where neat precise cuts are required, for example in the slicing of meats and vegetables.
  • a smooth edged blade is particularly effective when sharp but has the disadvantage that the edge is easily dulled by contact with a hard object such as the bone in a cooked joint of meat.
  • Smooth edged blades also present difficulties in slicing through a hard skin or crust as might be found for example on a loaf of bread.
  • Scalloped edge blades are also well known and are generally formed by grinding with a wheel so as to produce uniform scallops with a substantially constant radius. Hand knives are often provided with scallops to increase their cutting effectiveness. Scallops may be provided on the tip of a knife only, for example on steak knives.
  • scalloped blades A particular advantage of scalloped blades is that points of the scallop can break through a hard crust or skin and thus provide a more penetrating action than is possible with a smooth edged blade. Furthermore, the points of the scallop to some extent protect the cutting edge of the curved part of the scallop from damage by contact with hard objects, such as meat bones, or inadvertent contact with a work bench or carving plate. Serrated blades are also known and have small closely spaced teeth to give a saw-like action. Both scalloped and serrated blades present difficulties in slicing certain foodstuffs as their action tends to tear and deform the food. Such blades also lack the smooth easy action of a straight edged blade.
  • the present invention provides an improved blade which combines the advantages of smooth edged and scalloped/serrated blades.
  • a blade having a scalloped edge characterised thereby that a plurality of individual scallops have an asymmetric profile such that in use the blade is better adapted for slicing in one direction than the other.
  • One side of the scallop is better adapted for slicing since the length of scallop edge substantially in contact with the item to be cut is greater than the other side of the scallop.
  • the other side of the scallop presents a steeper blade edge of the item giving a penetrating cutting effect.
  • the blade preferably provides a continuous cutting edge of substantially constant sharpness.
  • the blade may have repeated asymmetric scallops along its entire cutting edge. With this configuration the trailing edge of each scallop makes a shallow angle with the item to be cut in one direction of blade movement and a relatively steeper angle in the other direction of blade movement.
  • the trailing edges of the scallop may blend into one another or may terminate in a point as will be hereafter described.
  • the total length of scallop edge substantially in contact with the item to be cut is greater for one direction of blade movement than the other, giving a better slicing action in said one direction. In the other direction the relatively steeper blade edges will rip or tear through a hard skin or crust.
  • shallow angle and relatively steeper angle are intended to define a range of angles which give an easy slice when the scallop trailing angle is shallow and a penetrating cutting action when the trailing angle is relatively steeper.
  • the profile of an individual scallop is curved, the angle subtended by the trailing edge will change depending on the position of measurement.
  • the invention includes scallops having very small radii of curvature and is intended to include large serrations in the nature of scallops having two substantially straight sides.
  • Any reference to the direction of blade movement should be construed as conventional movement substantially parallel to the longitudinal axis of the blade.
  • each of said asymmetric scallops comprises a substantially continuous curve which rises progressively from one end of the scallop to a peak and falls progressively from the peak to the other end of the scallop.
  • the peak may be substantially to one side of the scallop mid-point.
  • the asymmetric scallops comprise a convex blade portion and a concave blade portion only.
  • Intermediate plain blade portions may be provided between individual scallops or the scallops may be arranged in a regular pattern including intermediate plain blade portions or conventional uniform scallops.
  • a point may be provided between adjacent scallops, the point may be inset from the scallop base line so that with low applied force the blade slices easily without assistance from the points.
  • FIG. 1 there is shown a conventional kitchen knife having a plain smooth edged blade 11 secured to a handle 12 by rivets 13.
  • Figure 2 shows a similar knife 14 having a scalloped cutting edge.
  • Figures 3 and 4 show portions of knife blades having large and small scallops respectively.
  • Figure 5 illustrates the method of manufacture of a scalloped blade 15 whereby a grinding wheel having a grind line represented by chain-dot line 16 removes metal from the blade.
  • the grinding wheel has a cutting edge of generally constant radius and operates against the blade to grind a scallop of somewhat smaller radius respectively shown as R and r in Figures 3 and 4.
  • a single grinding wheel having many arcuate profiles may be used to grind a blade in a single pass. Both sides of the blade may be ground.
  • Figure 6 illustrates a scalloped blade 20 according to one aspect of the present invention.
  • Asymmetrical scallops 21 are provided each having a shallow angle 22 to one side of the scallop and a steep angle 23 to the other side. Adjacent scallops meet at a point 24.
  • the scallop shape may be conveniently defined by the slope of the blade edge at the scallop ends, as shown; the leading and trailing edges of the scallop blending in a smooth curve.
  • arrow "A" indicates movement towards the user and in this case the scallop design exploits the natural physiological limitations of the user whereby a gentle easy slice action is obtained by movement towards the user and a heavy forceful cut is obtained by movement away from the user.
  • Figure 7 shows an alternative blade 25 having a scallop profile in which the slicing portion 27 is convex.
  • the shape of this particular scallop may be defined by the dimensions A and B and radii R1 and R2 as shown.
  • Dimension A is a straight portion of blade
  • dimension B is the overall scallop length
  • R1 is the radius of the cutting portion of the scallop
  • R2 is the radius of the slicing portion of the scallop.
  • Suitable proportions of A:B:R1:R2 are 1:8:2.5:5, the scallop depth being proportionally 1.6.
  • an effective point 29 is provided for a cutting stroke only.
  • Figure 8 illustrates a blade having a further alternative profile having a straight shallow angle slicing portion 30 and a straight steep angled cutting portion 31 for breaking through skins or crusts.
  • Figures 9 to 11 show other alternative asymmetric scallops each having a different profile.
  • FIG 9 there is shown a generally curved scallop profile defined by radii R3 and R4.
  • the profile has point 32 between adjacent convex and concave blade portions marking the change in curvature.
  • the point 32 is set back from the scallop base line (line A-A) so that under light applied force, i.e. slicing, the point performs no cutting action. With greater applied force the item to be cut will be deformed and the point 32 brought into contact to perform a useful cutting function in breaking through a tough crust or skin.
  • the mid-point of the scallop is indicated by dotted line 33, the scallop peak being substantially on the cutting side of the profile.
  • Figure 10 shows a generally concave profile connected by straight blade portions 34.
  • the slicing and cutting edges of the scallop are indicated by reference numerals 35 and 36 and defined by angles 37 and 38 respectively; the cutting and slicing edges of the scallop blend smoothly into one another.
  • the mid-point of the scallop is indicated by dotted line 39.
  • Figure 11 shows a convex/concave profile having a slicing portion 41, defined by R5, blending smoothly with a plain blade portion 40 and a cutting portion 42, defined by obtuse angle 43, giving a very effective cutting and scoring point 44.
  • the mid-point of the scallop is indicated by dotted line 45.
  • scalloped profiles including for example symmetric and asymmetric scallops in combination, to give the desired cutting actions in the respective directions of use.
  • Asymmetric scallops may be provided over a portion of the blade length only, for example at the tip on steak knives. This arrangement allows the hard skin of a meat joint to be scored and cut into with the scalloped tip, the knife being used to slice using the plain portion of the blade and the scalloped tip being used to cut through the skin on the other side of the joint.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)
  • Meat, Egg Or Seafood Products (AREA)
EP84303720A 1983-06-03 1984-06-04 Schneideklinge Withdrawn EP0128032A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB838315378A GB8315378D0 (en) 1983-06-03 1983-06-03 Knife blade
GB8315378 1983-06-03

Publications (2)

Publication Number Publication Date
EP0128032A2 true EP0128032A2 (de) 1984-12-12
EP0128032A3 EP0128032A3 (de) 1985-11-06

Family

ID=10543803

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84303720A Withdrawn EP0128032A3 (de) 1983-06-03 1984-06-04 Schneideklinge

Country Status (5)

Country Link
EP (1) EP0128032A3 (de)
AU (1) AU568558B2 (de)
ES (1) ES279659Y (de)
GB (2) GB8315378D0 (de)
ZA (1) ZA843796B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1479488A4 (de) * 2002-02-15 2005-05-04 Kai R&D Center Co Ltd Schneidvorrichtung

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014155602A (ja) * 2013-02-15 2014-08-28 Mirai Ind Co Ltd 波付硬質合成樹脂管の切断方法及びナイフ
JP2017079939A (ja) * 2015-10-26 2017-05-18 株式会社 富田刃物 刃物類

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075310A (en) * 1935-03-25 1937-03-30 Grace L Arthur Knife
GB455480A (en) * 1936-04-20 1936-10-21 Edward Sprague Jr Improvements in knives
GB522138A (en) * 1938-12-07 1940-06-10 Edward Robertson Kinghorn Improvements relating to wood-working saws
GB641636A (en) * 1948-05-04 1950-08-16 Gustav Jirikowski Improvements in and relating to saws used for felling trees
GB657019A (en) * 1949-02-04 1951-09-05 Montague Abrams Improvements in knives
GB727227A (en) * 1952-11-17 1955-03-30 C D Ets Improvements in or relating to band saws
US2849037A (en) * 1954-12-09 1958-08-26 John W Wright Reciprocating saw blade
FR1163786A (fr) * 1957-01-08 1958-09-30 Neuzeughammer Ambosswerk Messe Couteau à affûtage ondulé
GB834750A (en) * 1957-06-12 1960-05-11 Oskar Wellauer Improvements in or relating to saw blades
DE1078011B (de) * 1958-10-20 1960-03-17 Karl Gruen Messer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1479488A4 (de) * 2002-02-15 2005-05-04 Kai R&D Center Co Ltd Schneidvorrichtung

Also Published As

Publication number Publication date
GB2140732A (en) 1984-12-05
AU568558B2 (en) 1988-01-07
ES279659U (es) 1985-01-01
GB8315378D0 (en) 1983-07-06
EP0128032A3 (de) 1985-11-06
GB2140732B (en) 1986-07-16
ZA843796B (en) 1986-01-29
GB8414003D0 (en) 1984-07-04
ES279659Y (es) 1986-05-16
AU2838884A (en) 1984-12-06

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19860707

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Inventor name: ROBINSON, GEOFFREY