US20060073779A1 - Knife sharpener - Google Patents
Knife sharpener Download PDFInfo
- Publication number
- US20060073779A1 US20060073779A1 US11/240,477 US24047705A US2006073779A1 US 20060073779 A1 US20060073779 A1 US 20060073779A1 US 24047705 A US24047705 A US 24047705A US 2006073779 A1 US2006073779 A1 US 2006073779A1
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- United States
- Prior art keywords
- knife
- sharpening
- case
- knife sharpener
- strips
- 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.)
- Abandoned
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- 229910052751 metal Inorganic materials 0.000 description 3
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- 238000005520 cutting process Methods 0.000 description 2
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- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 description 1
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- 230000003746 surface roughness Effects 0.000 description 1
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Images
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
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- 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 case is formed into a box-like shape and has a wall with the slot in shape of a straight line formed therein and inner wall surfaces serving as the stoppers.
- four or more the sharpening strips are alternately arranged along the width direction thereof.
- 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 is a perspective view showing a knife sharpener of a first embodiment with an outer case and an inner case thereof being partially cut away;
- FIG. 2 is a plan view showing the knife sharpener of FIG. 1 with the inner case being partially cut away;
- FIGS. 3A and 3B are sectional views taken along line III-III in FIG. 2 , showing a state where an inner case is accommodated in the outer case and a state where the inner case protrudes from the outer case, respectively;
- FIG. 4 is a developed view showing a sharpening member applied to the knife sharpener of FIG. 1 ;
- FIGS. 5A and 5B are diagrams for explaining a function of stoppers in the knife sharpener of FIG. 1 , and showing a sharpening groove with and without the stoppers, respectively;
- FIG. 6 is a view showing a knife sharpened with the knife sharpener of FIG. 1 , and an enlarged sectional view showing a blade edge and its vicinity in a circle;
- FIG. 7 is a side view showing a knife sharpener of a modification example, partially illustrated in section;
- FIG. 8 is an exploded view showing the knife sharpener of FIG. 7 ;
- FIG. 9 is an elevation view showing a sharpening member applied to the knife sharpener of FIG. 7 with one disc thereof.
- 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 .
- 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 .
- the maximum width of the opening of the sharpening groove 24 is determined by distance between the inner wall surfaces and is greater than the width of the slot 12 .
- an intersection angle hereinafter also referred to as a preset intersection angle
- 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.
- the strip portions 20 When the strip portions 20 are pressed by the blade edge of the knife during the sharpening, as diagrammatically shown in FIG. 5A , the strip portions 20 are elastically deformed and bent outward into a concave shape in relation to the blade edge of the knife. In other words, due to the pressure of the knife, an intersection angle ⁇ between the strip portions 20 , which corresponds to a vertex angle of the sharpening groove, is increased beyond the preset intersection angle determined by the inner wall surfaces of the inner case 4 . This is because the roots of the strip portions 20 are fixed in the inner case 4 , and moreover the tip ends of the strip portions 20 are in contact with the inner wall surfaces of the inner case 4 .
- 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.
- both faces of the final bevel 44 created in the blade edge 42 is formed into the convex shape, the knife is easily separated from an object to be cut and moreover cuts well at the time of the cutting, compared to a knife in which both the faces of the final bevel 44 are shaped into flat surfaces.
- 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.
- the strip portions in which the abrasive surfaces are integrally formed by rolling a plurality of, for example, 400-mesh or 600-mesh metal nets in which abrasive grains are studded on the surfaces of wires, in a piled state to be integrated.
- the thickness of the gained strip portions may be adjusted by inserting released paper between the metal nets.
- 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.
- the sharpening member 52 of the knife sharpener has a first member 64 and a second member 66 combined together as if engaged with each other, and a columnar spacer 68 interposed between centers of the first and second members 64 and 66 .
- the first and second members 64 and 66 have equilateral octagonal base portions 64 a and 66 a , respectively, for sandwiching the spacer 68 .
- Strip portions 64 b and 66 b radially extend from each side of the base portions 64 a and 66 a as shown in FIG. 9 .
- Abrasive surfaces 64 c and 66 c are formed in one face of each of the strip portions 64 b and 66 b , respectively.
- each of the strip portions 64 b and 66 b corresponds to half the length of each side of the base portions 64 a and 66 a .
- Roots of the strip portions 64 b and 66 b are arranged on one side of each side of the base portions 64 a and 66 a so as to allow the strip portions 64 b and 66 b to intersect with each other as if engaged with each other.
- the roots of the strip portions 64 b and 66 b are so bent that the strip portions 64 b and 66 b intersect with each other. Tip ends of the strip portions 64 b and 66 b are in contact with inner wall surfaces of the discs 56 near roots of the projections 60 .
- spread portions of the strip portions 64 b and 66 b which stretch from the intersecting points to the tip ends of the strip portions 64 b and 66 b , 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 64 c and 66 c of the strip portions 64 b and 66 b 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 64 b and 66 b 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 .
- Formed in the protective cover 72 is an opening 74 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 .
- 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.
- 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.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Polishing Bodies And Polishing Tools (AREA)
Abstract
A knife sharpener has at least two sharpening strips. The sharpening strips are arranged to adjoin each other in the width direction and intersect with each other. The sharpening strips are elastically deformable and include spread portions, respectively. The spread portions stretch from the intersecting point to one ends of the strips and are splayed to form a V-shaped groove having a vertex angle. The sharpener has abrasive surfaces formed on one surfaces of the spread portions, respectively. The abrasive surfaces form both side faces of the groove. The sharpener further has a fixing member fixing the other ends of the strips and stoppers brought into contact with the strips to limit maximum opening width of said groove. The abrasive surfaces are bent by the fixing member and stoppers to increase the vertex angle when a blade edge of a knife is sharpened in the groove.
Description
- 1. Field of the Invention
- The present invention relates to a knife sharpener.
- 2. Description of the Related Art
- As a knife sharpener of this type, Unexamined Japanese Patent Publication No. 2004-90169, for example, 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.
- In the process of sharpening the blade edge of a knife, there is formed in the tip end portion of the knife a portion called 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.
- It is an object of the present invention to provide a knife sharpener with a simple structure, which sharpens a knife so that the knife has excellent handling and lasts in sharpness for a long period.
- In order to achieve the above object, 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.
- According to the knife sharpener of the present invention, 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. When the knife is relatively moved in the groove with the increased vertex angle, 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.
- In a preferred aspect, 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.
- In a preferred aspect, 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.
- In a preferred aspect, the case is formed into a box-like shape and has a wall with the slot in shape of a straight line formed therein and inner wall surfaces serving as the stoppers.
- In a preferred aspect, four or more the sharpening strips are alternately arranged along the width direction thereof.
- In a preferred aspect, 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.
- In a preferred aspect, 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.
- In a preferred aspect, 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.
- The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limitative of the present invention, and wherein:
-
FIG. 1 is a perspective view showing a knife sharpener of a first embodiment with an outer case and an inner case thereof being partially cut away; -
FIG. 2 is a plan view showing the knife sharpener ofFIG. 1 with the inner case being partially cut away; -
FIGS. 3A and 3B are sectional views taken along line III-III inFIG. 2 , showing a state where an inner case is accommodated in the outer case and a state where the inner case protrudes from the outer case, respectively; -
FIG. 4 is a developed view showing a sharpening member applied to the knife sharpener ofFIG. 1 ; -
FIGS. 5A and 5B are diagrams for explaining a function of stoppers in the knife sharpener ofFIG. 1 , and showing a sharpening groove with and without the stoppers, respectively; -
FIG. 6 is a view showing a knife sharpened with the knife sharpener ofFIG. 1 , and an enlarged sectional view showing a blade edge and its vicinity in a circle; -
FIG. 7 is a side view showing a knife sharpener of a modification example, partially illustrated in section; -
FIG. 8 is an exploded view showing the knife sharpener ofFIG. 7 ; and -
FIG. 9 is an elevation view showing a sharpening member applied to the knife sharpener ofFIG. 7 with one disc thereof. -
FIG. 1 throughFIGS. 3A and 3B show a knife sharpener of a first embodiment. The knife sharpener has anouter case 2. Theouter 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 theouter case 2 are open. - An
inner case 4 is accommodated in theouter case 2 in an embedded state and is protrudable from the open side face of theouter case 2. Theinner case 4 is formed by bending a band plate into the shape of the letter U and has twoside wall portions 6 and onecurved portion 8. Theside wall portions 6 stretch parallel to each other along a longitudinal direction of theouter case 2. When theinner case 4 is accommodated in theouter case 2, one of theside wall portions 6 is so positioned as to close the open side face of theouter case 2. Base ends of theside wall portions 6 are joined together with the semicircular curvedportion 8. Thecurved portion 8 is disposed on the other end face side of theouter case 2. - When the
inner case 4 is accommodated in theouter case 2, tip ends of theside wall portions 6 are positioned on the open end face side of theouter case 2. At the tip ends of theside wall portions 6, there are formedprojections projections slot 12. When theinner case 4 protrudes from theouter case 2, theslot 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 theside wall portions 6, or a longitudinal direction of theslot 12. - Disposed in the
inner case 4 is a sharpeningmember 14, which is formed by bending aplate material 16 shown inFIG. 4 . Theplate material 16 has arectangular base portion 18 in the middle thereof, and twostrip portions 20 extend from each end of thebase portion 18. A gap between thestrip portions 20 on each end of thebase portion 18 is virtually equal to the width of thestrip portion 20. The fourstrip portions 20 have axes parallel to each other. Thestrip portions 20 are formed alternately in both the ends of thebase portion 18 with respect to the width direction thereof. - Each of the
strip portions 20 has elasticity. There is formed anabrasive surface 22 in one face of each of thestrip portions 20. Abrasive grains having a proper grain diameter dispersedly adhere onto theabrasive surface 22 such that surface roughness thereof conforms to for example a 300 grit whetstone, that is, a coarse grit whetstone. Although a material of the abrasive grains is not particularly limited, it is preferably diamond or titanium nitride in consideration of its high strength. - Referring to
FIG. 1 andFIGS. 3A and 3B again, in order to make the sharpeningmember 14 out of theplate material 16, theplate material 16 is bent at its longitudinally middle portion. - To be more specific, the
base portion 18 of theplate material 16 is so bent that theabrasive surfaces 22 faces outside, and is molded into a semicircle that is inscribable to thecurved portion 8 of theinner case 4. Roots of thestrip portions 20, which continue to thebase portion 18, are bent in the same direction as a bending direction of thebase portion 18 such that thestrip portions 20 extending from both the ends of thebase portion 18 intersect with each other as if engaged with each other. - The sharpening
member 14 made out of theplate material 16 is accommodated in theinner case 4 in a state where thebase portion 18 is inscribed to thecurved portion 8 of theinner case 4. Thestrip portions 20 crossly extend between theside wall portions 6 of theinner case 4, and tip ends of thestrip portions 20 come into contact with inner wall surfaces of theside wall portions 6 near roots of theprojections 10. Since the fourstrip portions 20 intersect with each other as if engaged with each other, they are arranged alternately in the width direction of theside wall portions 6, or in the longitudinal direction of theslot 12, and positioned adjacently to each other. - In the sharpening
member 14, portions (hereinafter referred to as spread portions) included in thestrip portions 20, which stretch from an intersecting point to the tip ends of thestrip portions 20, form a V-shaped sharpeninggroove 24. The spread portions are splayed toward theslot 12, and an opening of the sharpeninggroove 24 is positioned near theslot 12. The sharpeninggroove 24 stretches along theslot 12, and theabrasive surfaces 22 form both side faces of the sharpeninggroove 24. - Since the tip ends of the
strip portions 20 are in contact with inner wall surfaces of theinner case 4, the maximum width of the opening of the sharpeninggroove 24 is determined by distance between the inner wall surfaces and is greater than the width of theslot 12. When the sharpener is out of operation, an intersection angle (hereinafter also referred to as a preset intersection angle) between thestrip portions 20 is determined by the distance between the inner wall surfaces of theinner case 4. - In the
outer case 2, ablock 26 made of resin is disposed on the other end face side thereof. Theblock 26 supports theinner case 4 and the sharpeningmember 14 such that they are turnable. - To be concrete, the
block 26 has a columnar shape, and thebent base portion 18 of the sharpeningmember 14 and the bent roots of thestrip portions 20 are in sliding contact with an outer circumferential surface of theblock 26. As illustrated inFIG. 2 , theblock 26 is fastened to one side wall of theouter case 2 with ascrew 28 and has aflange portion 30 in one end on thescrew 28 side. Theflange portion 30 is positioned between theinner case 4 and the one side wall of theouter case 2, thereby securing a space therebetween. Disposed in this space is aleaf spring 32, which presses theinner case 4 against a side wall of theouter case 2, opposite to the one side wall. - In
FIG. 3 ,reference numeral 34 represents a collapsible stopper rod. Thestopper rod 34 is disposed between theouter case 2 and theinner case 4. Both ends of thestopper rod 34 are hinge-jointed to theouter case 2 and theinner case 4. - A knife-sharpening method using the above-mentioned knife sharpener will be described below.
- To use the knife sharpener, the
inner case 4 is first rotated to protrude from theouter case 2. As illustrated inFIG. 3B , theinner case 4 is brought into an upright position such that theslot 12 is positioned on an upper side. At this point, theinner case 4 is supported by thestopper rod 34, which prevents undesired falling of theinner case 4. Subsequently, the user holds down theouter case 2 with one hand, and grasps the knife with the other. Subsequently, while pressing a blade edge of the knife against the sharpeninggroove 24 through theslot 12, the user moves the knife back and forth several times in the blade length direction, to thereby sharpen the blade edge. - When the
strip portions 20 are pressed by the blade edge of the knife during the sharpening, as diagrammatically shown inFIG. 5A , thestrip portions 20 are elastically deformed and bent outward into a concave shape in relation to the blade edge of the knife. In other words, due to the pressure of the knife, an intersection angle θ between thestrip portions 20, which corresponds to a vertex angle of the sharpening groove, is increased beyond the preset intersection angle determined by the inner wall surfaces of theinner case 4. This is because the roots of thestrip portions 20 are fixed in theinner case 4, and moreover the tip ends of thestrip portions 20 are in contact with the inner wall surfaces of theinner case 4. - If the blade edge is moved in the sharpening
groove 24 in the state where the intersection angle θ is beyond the preset intersection angle as described, a final bevel having convex side faces is formed in the blade edge correspondingly to the bending of thestrip portions 20, and the convex faces have a virtually involute shape.FIG. 5B diagrammatically shows the deformation of thestrip portions 20 when the knife is pressed against the sharpeninggroove 24 on the assumption that the tip ends of thestrip portions 20 are not restrained by the inner wall surfaces of thecase 4. It is apparent fromFIG. 5B that if the ends of thestrip portions 20 are not restrained, it is impossible to gain the final bevel having convex side faces. -
FIG. 6 shows aknife 40 sharpened with the above-mentioned knife sharpener. As shown in a circle of the figure, afinal bevel 44 is formed within an area stretching about 0.02 to 0.2 mm from a tip end of ablade edge 42 of theknife 40. In the sharpener, according to a preferred aspect, the preset intersection angle, elasticity characteristic, and the like of thestrip portions 20 are so selected that an angle α of theblade edge 42 of theknife 40 sharpened falls in a range between about 18 and 22 degrees, and that an angle β of thefinal bevel 44 between about 28 and 32 degrees. - In case that the
knife 40 is used, since both faces of thefinal bevel 44 created in theblade edge 42 is formed into the convex shape, the knife is easily separated from an object to be cut and moreover cuts well at the time of the cutting, compared to a knife in which both the faces of thefinal bevel 44 are shaped into flat surfaces. - Furthermore, since the sharpening
groove 24 splays beyond the preset intersection angle during the sharpening, the angle β of thefinal bevel 44 is greater than the angle α of theblade edge 42. As a result, 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. For example, 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 theinner case 4 without providing theouter case 2. - In the first embodiment, the inner wall surfaces of the
inner case 4 function as the stoppers that determine the maximum opening width of the sharpeninggroove 24 and the preset intersection angle between thestrip portions 20. As stoppers, however, it is possible to provide for example pins that can contact somewhere in the spread portions of thestrip portions 20 from the outside. - In addition, the tip ends of the
strip portions 20 are in contact with the inner wall surfaces of theinner case 4 even in the unused state, and the intersection angle θ in the unused state equals the preset intersection angle. However, the preset intersection angle may be set greater than the intersection angle θ in the unused state by providing an allowance between the tip ends of thestrip portions 20 and the inner wall surfaces of theinner case 4. - Although in the first embodiment, the sharpening
member 14 has the fourstrip portions 20 intersecting with each other, the number of thestrip portions 20 is sufficient if there are at least two or more so that thestrip portions 20 may intersect with each other. It is preferable, however, that the number of thestrip portions 20 be four or more in order to retain the proper elasticity characteristic in thestrip portions 20 and prevent the knife from wobbling during the sharpening at the same time. - Additionally, although the sharpening
member 14 is made of metal, a sharpening member made of resin or a vegetable fiber may be utilized. In this case, 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. - Furthermore, it is possible to form the strip portions in which the abrasive surfaces are integrally formed by rolling a plurality of, for example, 400-mesh or 600-mesh metal nets in which abrasive grains are studded on the surfaces of wires, in a piled state to be integrated. In this case, the thickness of the gained strip portions may be adjusted by inserting released paper between the metal nets.
-
FIGS. 7 and 8 show the knife sharpener of a second embodiment. The knife sharpener has amotor 54 to which acase 50 and a sharpeningmember 52 are integrally and rotatably attached. - More specifically, the
case 50 of the knife sharpener has twodiscs 56. Thediscs 56 are fixed to arotary shaft 58 of themotor 54 and are separated away from each other. Formed in the rims of thediscs 56, rim-shapedprojections 60 protruding toward each other, and a gap between theprojections 60 defines the width of aslot 62. Theslot 62 extends in a circumferential direction of thediscs 56, or thecase 50, to have a ring-like shape. - The sharpening
member 52 of the knife sharpener has afirst member 64 and asecond member 66 combined together as if engaged with each other, and acolumnar spacer 68 interposed between centers of the first andsecond members second members octagonal base portions spacer 68.Strip portions base portions FIG. 9 .Abrasive surfaces strip portions - The width of each of the
strip portions base portions strip portions base portions strip portions strip portions strip portions strip portions discs 56 near roots of theprojections 60. - Again in this case, spread portions of the
strip portions strip portions grooves 70. The spread portions are splayed toward theslot 62, and openings of the sharpeninggrooves 70 are positioned near theprojections 60. The sharpeninggrooves 70 are disposed at regular intervals in a circumferential direction of theslot 62. The abrasive surfaces 64 c and 66 c of thestrip portions grooves 70. - Again, since the tip ends of the
strip portions discs 56, or inner end faces of thecase 50, the maximum width of the opening of each of the sharpeninggrooves 70 is determined by distance between the inner wall surfaces, and is greater than the width of theslot 62. When the sharpener is not in use, the preset intersection angle between thestrip portions case 50. - The
discs 56, the first andsecond members spacer 68 each have a fixing hole in which therotary shaft 58 of themotor 54 is inserted such that they cannot relatively rotated. -
Reference numeral 72 denotes a protective cover, which encloses therotating case 50. Formed in theprotective cover 72 is anopening 74 that matches an upper half peripheral portion of theslot 62. - In case that the knife sharpener of the above modification example is used, the blade edge of the knife is first pressed against the sharpening
grooves 70 splaying upward through theopening 74 of theprotective cover 72 and theslot 62. If themotor 54 is operated with the knife grasped in this state, the first andsecond members case 50. The rotation causes the rotation of the sharpeninggrooves 70, that is, relative movement between the sharpeninggrooves 70 and the knife in the blade length direction, which sharpens the blade edge. Accordingly, the knife sharpener enables not only the formation of thefinal bevel 44 in the blade edge but also the rapid sharpening. The rotation speed of themotor 54 can be properly changed using a controller which is not shown. - The invention thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the following claims.
Claims (8)
1. A knife sharpener comprising:
at least two sharpening strips arranged to adjoin each other in a width direction thereof and intersect with each other at an intersecting point, said sharpening strips each being elastically deformable and including spread portions, the spread portions stretching from the intersecting point to one ends of said 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, said abrasive surfaces forming side faces of said groove; and
bending means for bending said abrasive surfaces to increase the vertex angle when a blade edge of a knife is sharpened in said groove.
2. The knife sharpener according to claim 1 , wherein
said bending means includes
a fixing member fixing the other ends of said sharpening strips and
stoppers brought into contact with said sharpening strips to limit maximum opening width of said groove.
3. The knife sharpener according to claim 1 , further comprising:
a case accommodating said sharpening strips and having a slot stretching in the width direction of said sharpening strips, the slot receiving the blade edge of the knife movably in a direction of blade length of the knife when the blade edge is sharpened.
4. The knife sharpener according to claim 3 , wherein
said case is formed into a box-like shape and has a wall with the slot in shape of a straight line formed therein and inner wall surfaces serving as the stoppers.
5. The knife sharpener according to claim 1 , wherein
four or more of said sharpening strips are alternately arranged along the width direction thereof.
6. The knife sharpener according to claim 1 , further comprising:
an outer case accommodating said case such that said case is protrudable therefrom and serving as a holding portion when the blade edge of the knife is sharpened.
7. The knife sharpener according to claim 3 , wherein
a plurality of said grooves are radially arranged around a rotary shaft to be rotatable integrally with said rotary shaft, and the spread portions of said sharpening strips are splayed in a radial outward direction of the rotary shaft, and
said knife sharpener further comprises a motor for rotating the rotary shaft.
8. The knife sharpener according to claim 7 , wherein
said case is disposed to be rotatable integrally with the rotary shaft and is formed into a cylinder-like shape, said case having a circumferential wall with the slot in a ring shape formed therein and inner wall surfaces serving as the stoppers.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-291364 | 2004-10-04 | ||
JP2004291364A JP3925658B2 (en) | 2004-10-04 | 2004-10-04 | Blade polishing equipment |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060073779A1 true US20060073779A1 (en) | 2006-04-06 |
Family
ID=35335611
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/240,477 Abandoned US20060073779A1 (en) | 2004-10-04 | 2005-10-03 | Knife sharpener |
Country Status (11)
Country | Link |
---|---|
US (1) | US20060073779A1 (en) |
EP (1) | EP1642677A1 (en) |
JP (1) | JP3925658B2 (en) |
KR (1) | KR100766207B1 (en) |
CN (1) | CN100429042C (en) |
AU (1) | AU2005219833C1 (en) |
CA (1) | CA2522164C (en) |
HK (1) | HK1085965A1 (en) |
NO (1) | NO20054279L (en) |
NZ (1) | NZ542753A (en) |
TW (1) | TWI290079B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007061535B4 (en) * | 2007-12-20 | 2017-03-16 | Harald Stallegger | Knife sharpening |
KR101001724B1 (en) | 2010-07-06 | 2010-12-15 | 주식회사 대한정공 | Working method of blade |
CN107052915A (en) * | 2017-01-23 | 2017-08-18 | 刘福民 | A kind of abrasive band electric knife sharpener and its method to set up |
DE102017011680A1 (en) * | 2017-12-18 | 2019-06-19 | Zwilling J. A. Henckels Aktiengesellschaft | Knife sharpening |
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US4716689A (en) * | 1984-03-12 | 1988-01-05 | Friel Daniel D | Methods and apparatus for knife and blade sharpening |
US5390431A (en) * | 1992-06-18 | 1995-02-21 | Edgecraft Corporation | Method and apparatus for knife and blade sharpening |
US5440953A (en) * | 1994-09-22 | 1995-08-15 | Tru Hone Corporation | Knife sharpener |
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 |
US20030075022A1 (en) * | 2001-10-18 | 2003-04-24 | Henry Mark James | Knife and blade sharpener |
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US7393266B2 (en) * | 2004-02-11 | 2008-07-01 | Harald Stallegger | Knife sharpening apparatus |
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JPS5214292U (en) | 1975-06-24 | 1977-02-01 | ||
US5582535A (en) * | 1992-06-18 | 1996-12-10 | Edgecraft Corporation | Method and apparatus for knife and blade sharpening |
CN2213045Y (en) * | 1994-12-24 | 1995-11-22 | 王允沭 | Hand-hold type knife sharpener |
SE513071C2 (en) * | 1997-08-18 | 2000-07-03 | Tore Eklund | Grinding device with flexible grinding arms for grinding edge tools |
JP2004090169A (en) | 2002-08-30 | 2004-03-25 | Yoshida Kinzoku Kogyo Kk | Sharpener for cutter |
-
2004
- 2004-10-04 JP JP2004291364A patent/JP3925658B2/en active Active
-
2005
- 2005-09-16 NO NO20054279A patent/NO20054279L/en not_active Application Discontinuation
- 2005-09-22 TW TW094132897A patent/TWI290079B/en active
- 2005-10-03 US US11/240,477 patent/US20060073779A1/en not_active Abandoned
- 2005-10-03 EP EP05109140A patent/EP1642677A1/en not_active Withdrawn
- 2005-10-03 NZ NZ542753A patent/NZ542753A/en unknown
- 2005-10-03 AU AU2005219833A patent/AU2005219833C1/en not_active Ceased
- 2005-10-03 CA CA002522164A patent/CA2522164C/en not_active Expired - Fee Related
- 2005-10-04 KR KR1020050093136A patent/KR100766207B1/en not_active IP Right Cessation
- 2005-10-08 CN CNB2005101132901A patent/CN100429042C/en not_active Expired - Fee Related
-
2006
- 2006-05-25 HK HK06105994A patent/HK1085965A1/en not_active IP Right Cessation
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
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US2432231A (en) * | 1945-12-20 | 1947-12-09 | Design Service Inc | Device for sharpening knives or the like |
US4716689A (en) * | 1984-03-12 | 1988-01-05 | Friel Daniel D | Methods and apparatus for knife and blade sharpening |
US5390431A (en) * | 1992-06-18 | 1995-02-21 | Edgecraft Corporation | Method and apparatus for knife and blade sharpening |
US5440953A (en) * | 1994-09-22 | 1995-08-15 | Tru Hone Corporation | Knife sharpener |
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 |
US6769326B2 (en) * | 2001-05-18 | 2004-08-03 | Bobet Materiel | Device for sharpening the blades of sharp tools |
US20030075022A1 (en) * | 2001-10-18 | 2003-04-24 | Henry Mark James | Knife and blade sharpener |
US6866569B2 (en) * | 2002-11-14 | 2005-03-15 | Cozzini, Inc. | Blade sharpening apparatus |
US7393266B2 (en) * | 2004-02-11 | 2008-07-01 | Harald Stallegger | Knife sharpening apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP2006102856A (en) | 2006-04-20 |
CN1757482A (en) | 2006-04-12 |
KR100766207B1 (en) | 2007-10-10 |
AU2005219833A1 (en) | 2006-04-27 |
CN100429042C (en) | 2008-10-29 |
TW200621422A (en) | 2006-07-01 |
CA2522164A1 (en) | 2006-04-04 |
HK1085965A1 (en) | 2006-09-08 |
AU2005219833C1 (en) | 2009-12-10 |
NZ542753A (en) | 2006-11-30 |
AU2005219833B2 (en) | 2009-04-23 |
NO20054279L (en) | 2006-04-05 |
EP1642677A1 (en) | 2006-04-05 |
TWI290079B (en) | 2007-11-21 |
JP3925658B2 (en) | 2007-06-06 |
KR20060052009A (en) | 2006-05-19 |
NO20054279D0 (en) | 2005-09-16 |
CA2522164C (en) | 2009-06-09 |
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Owner name: YOSHIDA METAL INDUSTRY CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SUZUKI, TAKASHI;TSUNEKAWA, YUTAKA;REEL/FRAME:017071/0355 Effective date: 20050912 |
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Owner name: YOSHIDA METAL INDUSTRY CO., LTD., JAPAN Free format text: CHANGE OF ADDRESS;ASSIGNOR:YOSHIDA METAL INDUSTRY CO., LTD.;REEL/FRAME:018970/0540 Effective date: 20050912 |
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