EP1642677A1 - Aiguisoir de couteau - Google Patents

Aiguisoir de couteau Download PDF

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Publication number
EP1642677A1
EP1642677A1 EP05109140A EP05109140A EP1642677A1 EP 1642677 A1 EP1642677 A1 EP 1642677A1 EP 05109140 A EP05109140 A EP 05109140A EP 05109140 A EP05109140 A EP 05109140A EP 1642677 A1 EP1642677 A1 EP 1642677A1
Authority
EP
European Patent Office
Prior art keywords
knife
sharpening
case
strips
knife sharpener
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Withdrawn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
EP05109140A
Other languages
German (de)
English (en)
Inventor
Takashi Suzuki
Yutaka Tsunekawa
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.)
YOSHIDA METAL INDUSTRY CO., LTD.
Original Assignee
Yoshida Metal Industry Co 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 Yoshida Metal Industry Co Ltd filed Critical Yoshida Metal Industry Co Ltd
Publication of EP1642677A1 publication Critical patent/EP1642677A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D15/00—Hand tools or other devices for non-rotary grinding, polishing, or stropping
    • B24D15/06—Hand tools or other devices for non-rotary grinding, polishing, or stropping specially designed for sharpening cutting edges
    • B24D15/08—Hand tools or other devices for non-rotary grinding, polishing, or stropping specially designed for sharpening cutting edges of knives; of razors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/52—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of shear blades or scissors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
    • B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
    • B24B3/54—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of hand or table knives

Definitions

  • the present invention relates to a knife sharpener.
  • Unexamined Japanese Patent Publication No. 2004-90169 discloses a device having a V-shaped sharpening groove for the blade edge of a knife to be pressed and slid against it. More specifically, the knife sharpener disclosed in the document has a plurality of sharpening strips arranged to intersect with each other in the shape of the letter V. These sharpening strips compose the V-shaped sharpening groove between abrasive surfaces formed in one of the sides of each strip. According to the knife sharpener described in the document, since the sharpening strips each have elasticity, the burr of the blade edge is pressed by the abrasive surfaces and the blade edge is straightened when the knife is being sharpened. Therefore the knife can be sharpened in a short time.
  • a final bevel having the shape of an isosceles triangle in section. It is preferable that the final bevel be so finished that each side face is shaped into a rounded convex surface. This is because if both side faces of the final bevel are sharpened into flat surfaces, the separability of an object to be cut is degraded at the time of the cutting, and this makes difficult the handling of the knife. Furthermore, since the final bevel is thin, a nick is easily made in the knife, and the sharpness of the knife is deteriorated in a short period. Consequently, the knife requires frequent sharpening.
  • the knife sharpener of the present invention has at least two sharpening strips arranged to adjoin each other in a width direction thereof and intersect with each other at an intersection point, the sharpening strips each being elastically deformable and including spread portions, the spread portions stretching from the intersecting point to one ends of the sharpening strips and being splayed to form a V-shaped groove having a vertex angle; abrasive surfaces formed on one surfaces of the spread portions, respectively, the abrasive surfaces forming side faces of said groove; and bending means for bending the abrasive surfaces to increase the vertex angle when a blade edge of a knife is sharpened in said groove.
  • the sharpening strips when the blade edge of the knife is pressed against the groove, the sharpening strips are elastically deformed and each of the abrasive surfaces is bent into a concave shape so that the vertex angle increases.
  • a final bevel produced in a tip end of the blade edge is so formed that both side faces thereof each have a convex shape matching the concave shape of the abrasive surfaces, which increases an angle of the final bevel.
  • the knife sharpened with the knife sharpener of the present invention in this manner enhances separability of an object to be cut and enables excellent handling thereof because both side faces of the final bevel formed in the tip end of the blade edge are each sharpened into the convex shape.
  • Such a knife allows the final bevel to be thick, so that a nick is hard to be made in the knife, and the sharpness of the knife lasts for a long time.
  • the bending means includes fixing member fixing the other ends of the sharpening strips, and stoppers brought into contact with the sharpening strips to limit the maximum opening width of the groove.
  • the knife sharpener further has a case accommodating the sharpening strips and having a slot stretching in the width direction of the sharpening strips.
  • the slot receives the blade edge of the knife movably in a direction of blade length of the knife when the blade edge is sharpened.
  • the knife sharpener further has an outer case that accommodates the case as an inner case such that the inner case is protrudable therefrom and serves as a holding portion during the sharpening of the knife.
  • a plurality of said grooves are radially arranged around a rotary shaft to be rotatable integrally with the rotary shaft, and the spread portions of the sharpening strips are splayed in a radial outward direction of the rotary shaft, and the knife sharpener further has a motor for rotating the rotary shaft.
  • the case is disposed to be rotatable integrally with the rotary shaft and formed into a cylinder-like shape.
  • the case has a circumferential wall with the slot in a ring shape formed therein and inner wall surfaces serving as the stoppers.
  • FIG. 1 through FIGS. 3A and 3B show a knife sharpener of a first embodiment.
  • the knife sharpener has an outer case 2.
  • the outer case 2 is formed into a box-like shape of a rectangular parallelepiped, and yet an entire one end face and an entire one side face of the outer case 2 are open.
  • An inner case 4 is accommodated in the outer case 2 in an embedded state and is protrudable from the open side face of the outer case 2.
  • the inner case 4 is formed by bending a band plate into the shape of the letter U and has two side wall portions 6 and one curved portion 8.
  • the side wall portions 6 stretch parallel to each other along a longitudinal direction of the outer case 2.
  • one of the side wall portions 6 is so positioned as to close the open side face of the outer case 2.
  • Base ends of the side wall portions 6 are joined together with the semicircular curved portion 8.
  • the curved portion 8 is disposed on the other end face side of the outer case 2.
  • tip ends of the side wall portions 6 are positioned on the open end face side of the outer case 2.
  • projections 10 and 10 projecting toward each other.
  • a gap formed between the projections 10 and 10 defines a slot 12.
  • the slot 12 receives a knife to be sharpened such that the knife is movable in a direction of blade length.
  • the blade length direction matches a width direction of the side wall portions 6, or a longitudinal direction of the slot 12.
  • a sharpening member 14 Disposed in the inner case 4 is a sharpening member 14, which is formed by bending a plate material 16 shown in FIG. 4.
  • the plate material 16 has a rectangular base portion 18 in the middle thereof, and two strip portions 20 extend from each end of the base portion 18.
  • a gap between the strip portions 20 on each end of the base portion 18 is virtually equal to the width of the strip portion 20.
  • the four strip portions 20 have axes parallel to each other.
  • the strip portions 20 are formed alternately in both the ends of the base portion 18 with respect to the width direction thereof.
  • Each of the strip portions 20 has elasticity. There is formed an abrasive surface 22 in one face of each of the strip portions 20.
  • Abrasive grains having a proper grain diameter dispersedly adhere onto the abrasive surface 22 such that surface roughness thereof conforms to for example a 300 grit whetstone, that is, a coarse grit whetstone.
  • a material of the abrasive grains is not particularly limited, it is preferably diamond or titanium nitride in consideration of its high strength.
  • the plate material 16 is bent at its longitudinally middle portion.
  • the base portion 18 of the plate material 16 is so bent that the abrasive surfaces 22 faces outside, and is molded into a semicircle that is inscribable to the curved portion 8 of the inner case 4. Roots of the strip portions 20, which continue to the base portion 18, are bent in the same direction as a bending direction of the base portion 18 such that the strip portions 20 extending from both the ends of the base portion 18 intersect with each other as if engaged with each other.
  • the sharpening member 14 made out of the plate material 16 is accommodated in the inner case 4 in a state where the base portion 18 is inscribed to the curved portion 8 of the inner case 4.
  • the strip portions 20 crossly extend between the side wall portions 6 of the inner case 4, and tip ends of the strip portions 20 come into contact with inner wall surfaces of the side wall portions 6 near roots of the projections 10. Since the four strip portions 20 intersect with each other as if engaged with each other, they are arranged alternately in the width direction of the side wall portions 6, or in the longitudinal direction of the slot 12, and positioned adjacently to each other.
  • portions included in the strip portions 20, which stretch from an intersecting point to the tip ends of the strip portions 20, form a V-shaped sharpening groove 24.
  • the spread portions are splayed toward the slot 12, and an opening of the sharpening groove 24 is positioned near the slot 12.
  • the sharpening groove 24 stretches along the slot 12, and the abrasive surfaces 22 form both side faces of the sharpening groove 24.
  • an intersection angle (hereinafter also referred to as a preset intersection angle) between the strip portions 20 is determined by the distance between the inner wall surfaces of the inner case 4.
  • a block 26 made of resin is disposed on the other end face side thereof.
  • the block 26 supports the inner case 4 and the sharpening member 14 such that they are turnable.
  • the block 26 has a columnar shape, and the bent base portion 18 of the sharpening member 14 and the bent roots of the strip portions 20 are in sliding contact with an outer circumferential surface of the block 26.
  • the block 26 is fastened to one side wall of the outer case 2 with a screw 28 and has a flange portion 30 in one end on the screw 28 side.
  • the flange portion 30 is positioned between the inner case 4 and the one side wall of the outer case 2, thereby securing a space therebetween.
  • a leaf spring 32 Disposed in this space is a leaf spring 32, which presses the inner case 4 against a side wall of the outer case 2, opposite to the one side wall.
  • reference numeral 34 represents a collapsible stopper rod.
  • the stopper rod 34 is disposed between the outer case 2 and the inner case 4. Both ends of the stopper rod 34 are hinge-jointed to the outer case 2 and the inner case 4.
  • the inner case 4 is first rotated to protrude from the outer case 2. As illustrated in FIG. 3B, the inner case 4 is brought into an upright position such that the slot 12 is positioned on an upper side. At this point, the inner case 4 is supported by the stopper rod 34, which prevents undesired falling of the inner case 4. Subsequently, the user holds down the outer case 2 with one hand, and grasps the knife with the other. Subsequently, while pressing a blade edge of the knife against the sharpening groove 24 through the slot 12, the user moves the knife back and forth several times in the blade length direction, to thereby sharpen the blade edge.
  • FIG. 5B diagrammatically shows the deformation of the strip portions 20 when the knife is pressed against the sharpening groove 24 on the assumption that the tip ends of the strip portions 20 are not restrained by the inner wall surfaces of the case 4. It is apparent from FIG. 5B that if the ends of the strip portions 20 are not restrained, it is impossible to gain the final bevel having convex side faces.
  • FIG. 6 shows a knife 40 sharpened with the above-mentioned knife sharpener.
  • a final bevel 44 is formed within an area stretching about 0.02 to 0.2 mm from a tip end of a blade edge 42 of the knife 40.
  • the preset intersection angle, elasticity characteristic, and the like of the strip portions 20 are so selected that an angle ⁇ of the blade edge 42 of the knife 40 sharpened falls in a range between about 18 and 22 degrees, and that an angle ⁇ of the final bevel 44 between about 28 and 32 degrees.
  • the sharpening groove 24 splays beyond the preset intersection angle during the sharpening, the angle ⁇ of the final bevel 44 is greater than the angle ⁇ of the blade edge 42.
  • a nick attributable to omission of carbide grains or the like is hard to be made, and the sharpness of the knife is retained for a long period. Consequently, it is not necessary to sharpen the knife frequently.
  • the present invention is not limited to the first embodiment, and various modifications can be made.
  • the outer case 2 may be molded from resin to have such a shape that is easily held down. It is also possible to integrally form a holding portion in the inner case 4 without providing the outer case 2.
  • the inner wall surfaces of the inner case 4 function as the stoppers that determine the maximum opening width of the sharpening groove 24 and the preset intersection angle between the strip portions 20.
  • stoppers it is possible to provide for example pins that can contact somewhere in the spread portions of the strip portions 20 from the outside.
  • the tip ends of the strip portions 20 are in contact with the inner wall surfaces of the inner case 4 even in the unused state, and the intersection angle ⁇ in the unused state equals the preset intersection angle.
  • the preset intersection angle may be set greater than the intersection angle ⁇ in the unused state by providing an allowance between the tip ends of the strip portions 20 and the inner wall surfaces of the inner case 4.
  • the sharpening member 14 has the four strip portions 20 intersecting with each other, the number of the strip portions 20 is sufficient if there are at least two or more so that the strip portions 20 may intersect with each other. It is preferable, however, that the number of the strip portions 20 be four or more in order to retain the proper elasticity characteristic in the strip portions 20 and prevent the knife from wobbling during the sharpening at the same time.
  • the sharpening member 14 is made of metal, a sharpening member made of resin or a vegetable fiber may be utilized.
  • the strip portions and the abrasive surfaces may be integrally formed by molding a mixture of a resin fiber or a vegetable fiber and abrasive grains to have thickness by using a method of manufacturing paper, self welding or an adhesive agent.
  • FIGS. 7 and 8 show the knife sharpener of a second embodiment.
  • the knife sharpener has a motor 54 to which a case 50 and a sharpening member 52 are integrally and rotatably attached.
  • the case 50 of the knife sharpener has two discs 56.
  • the discs 56 are fixed to a rotary shaft 58 of the motor 54 and are separated away from each other.
  • rim-shaped projections 60 protruding toward each other, and a gap between the projections 60 defines the width of a slot 62.
  • the slot 62 extends in a circumferential direction of the discs 56, or the case 50, to have a ring-like shape.
  • spread portions of the strip portions 64b and 66b which stretch from the intersecting points to the tip ends of the strip portions 64b and 66b, form V-shaped sharpening grooves 70.
  • the spread portions are splayed toward the slot 62, and openings of the sharpening grooves 70 are positioned near the projections 60.
  • the sharpening grooves 70 are disposed at regular intervals in a circumferential direction of the slot 62.
  • the abrasive surfaces 64c and 66c of the strip portions 64b and 66b form both side faces of the sharpening grooves 70.
  • the maximum width of the opening of each of the sharpening grooves 70 is determined by distance between the inner wall surfaces, and is greater than the width of the slot 62.
  • the preset intersection angle between the strip portions 64b and 66b is determined by the distance between the inner wall surfaces of the case 50.
  • the discs 56, the first and second members 64 and 66, and the spacer 68 each have a fixing hole in which the rotary shaft 58 of the motor 54 is inserted such that they cannot relatively rotated.
  • Reference numeral 72 denotes a protective cover, which encloses the rotating case 50.
  • An opening 74 is formed in the protective cover 72 that matches an upper half peripheral portion of the slot 62.
  • the blade edge of the knife is first pressed against the sharpening grooves 70 splaying upward through the opening 74 of the protective cover 72 and the slot 62. If the motor 54 is operated with the knife grasped in this state, the first and second members 64 and 66 are integrally rotation-activated together with the case 50. The rotation causes the rotation of the sharpening grooves 70, that is, relative movement between the sharpening grooves 70 and the knife in the blade length direction, which sharpens the blade edge. Accordingly, the knife sharpener enables not only the formation of the final bevel 44 in the blade edge but also the rapid sharpening. The rotation speed of the motor 54 can be properly changed using a controller which is not shown.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP05109140A 2004-10-04 2005-10-03 Aiguisoir de couteau Withdrawn EP1642677A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004291364A JP3925658B2 (ja) 2004-10-04 2004-10-04 刃物研磨装置

Publications (1)

Publication Number Publication Date
EP1642677A1 true EP1642677A1 (fr) 2006-04-05

Family

ID=35335611

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05109140A Withdrawn EP1642677A1 (fr) 2004-10-04 2005-10-03 Aiguisoir de couteau

Country Status (11)

Country Link
US (1) US20060073779A1 (fr)
EP (1) EP1642677A1 (fr)
JP (1) JP3925658B2 (fr)
KR (1) KR100766207B1 (fr)
CN (1) CN100429042C (fr)
AU (1) AU2005219833C1 (fr)
CA (1) CA2522164C (fr)
HK (1) HK1085965A1 (fr)
NO (1) NO20054279L (fr)
NZ (1) NZ542753A (fr)
TW (1) TWI290079B (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061535B4 (de) * 2007-12-20 2017-03-16 Harald Stallegger Messerschärfvorrichtung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101001724B1 (ko) 2010-07-06 2010-12-15 주식회사 대한정공 나이프의 칼날 가공방법
CN107052915A (zh) * 2017-01-23 2017-08-18 刘福民 一种砂带电动磨刀器及其设置方法
DE102017011680A1 (de) * 2017-12-18 2019-06-19 Zwilling J. A. Henckels Aktiengesellschaft Messerschärfvorrichtung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629473A2 (fr) * 1993-04-30 1994-12-21 Edgecraft Corporation Méthode et dispositif pour aiguiser des couteaux
EP0747171A1 (fr) * 1995-06-06 1996-12-11 Edgecraft Corporation Procédé et dispositif pour affûter des couteaux et des lames
WO1999011428A1 (fr) * 1997-08-18 1999-03-11 Tore Eklund Affuteur
JP2004090169A (ja) 2002-08-30 2004-03-25 Yoshida Kinzoku Kogyo Kk 刃物用研器

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2432231A (en) * 1945-12-20 1947-12-09 Design Service Inc Device for sharpening knives or the like
JPS5214292U (fr) 1975-06-24 1977-02-01
US4627194A (en) * 1984-03-12 1986-12-09 Friel Daniel D Method and apparatus for knife and blade sharpening
US5440953A (en) * 1994-09-22 1995-08-15 Tru Hone Corporation Knife sharpener
CN2213045Y (zh) * 1994-12-24 1995-11-22 王允沭 手持式磨刀器
US5611726A (en) * 1995-04-28 1997-03-18 Edgecraft Corporation High speed precision sharpening apparatus
US6101898A (en) * 1996-08-26 2000-08-15 Jokari/Us, Inc. Knife and scissors sharpener
FR2824770B1 (fr) * 2001-05-18 2003-10-03 Bobet Materiel Appareil pour affiler les lames d'outils tranchants
EP1329291B1 (fr) * 2001-10-18 2007-09-05 Füritechnics Group Pty Ltd Dispositif d'affûtage de lames et de couteaux
US6866569B2 (en) * 2002-11-14 2005-03-15 Cozzini, Inc. Blade sharpening apparatus
DE102004006714A1 (de) * 2004-02-11 2005-08-25 Harald Stallegger Messerschärfvorrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0629473A2 (fr) * 1993-04-30 1994-12-21 Edgecraft Corporation Méthode et dispositif pour aiguiser des couteaux
EP0747171A1 (fr) * 1995-06-06 1996-12-11 Edgecraft Corporation Procédé et dispositif pour affûter des couteaux et des lames
WO1999011428A1 (fr) * 1997-08-18 1999-03-11 Tore Eklund Affuteur
JP2004090169A (ja) 2002-08-30 2004-03-25 Yoshida Kinzoku Kogyo Kk 刃物用研器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007061535B4 (de) * 2007-12-20 2017-03-16 Harald Stallegger Messerschärfvorrichtung

Also Published As

Publication number Publication date
CN100429042C (zh) 2008-10-29
JP3925658B2 (ja) 2007-06-06
NO20054279D0 (no) 2005-09-16
TW200621422A (en) 2006-07-01
CA2522164A1 (fr) 2006-04-04
AU2005219833B2 (en) 2009-04-23
NZ542753A (en) 2006-11-30
JP2006102856A (ja) 2006-04-20
NO20054279L (no) 2006-04-05
TWI290079B (en) 2007-11-21
KR100766207B1 (ko) 2007-10-10
US20060073779A1 (en) 2006-04-06
AU2005219833A1 (en) 2006-04-27
AU2005219833C1 (en) 2009-12-10
CA2522164C (fr) 2009-06-09
KR20060052009A (ko) 2006-05-19
CN1757482A (zh) 2006-04-12
HK1085965A1 (en) 2006-09-08

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