WO2006130070A1 - Device and grinding means for sharpening of knife blades or similar. - Google Patents

Device and grinding means for sharpening of knife blades or similar. Download PDF

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Publication number
WO2006130070A1
WO2006130070A1 PCT/SE2006/000604 SE2006000604W WO2006130070A1 WO 2006130070 A1 WO2006130070 A1 WO 2006130070A1 SE 2006000604 W SE2006000604 W SE 2006000604W WO 2006130070 A1 WO2006130070 A1 WO 2006130070A1
Authority
WO
WIPO (PCT)
Prior art keywords
grinding means
grinding
knife blade
sharpening
permanent magnet
Prior art date
Application number
PCT/SE2006/000604
Other languages
French (fr)
Inventor
Leif Stern
Original Assignee
Leif Stern
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 Leif Stern filed Critical Leif Stern
Priority to EP06733429A priority Critical patent/EP1899108A4/en
Publication of WO2006130070A1 publication Critical patent/WO2006130070A1/en

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Classifications

    • 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 device for grinding or sharpening knife blades or similar, wherein at least one grinding means is provided to perform sharpening movements for grinding or sharpening the knife blade.
  • the knife blade can be located in at least one sharpening position in a support device in order to permit sharpening of said knife blade by means of the grinding means.
  • the invention further relates to grinding means for sharpening knife blades or similar.
  • the sharpening result depends on how the knife is handled during the sharpening operation. If e.g. the knife blade is momentarily pressed too hard or too loose against the grinding means, the sharpening result will be unacceptable.
  • the object of the present invention is to remedy said problem and this is arrived at by providing the abovementioned device primarily with the characterizing features of subsequent claim 1 or 13.
  • fig. 1 is a perspective view of a grinding apparatus with a device according to the invention
  • fig. 2 is a section through members of the device of fig. 1
  • fig. 3 is a section along the line Ill-Ill through members of fig. 2.
  • the grinding apparatus 1 illustrated in fig. 1 is preferably adapted for grinding or sharpening knife blades 2 on knives 3 for cooks for cutting foodstuff, but can be used for sharpening knife blades of other knives.
  • the knife blade 2 consists of a suitable metallic material, preferably steel.
  • the grinding apparatus 1 may comprise an electric motor 4 which preferably can be connected to the supply mains.
  • the electric motor 4 has a shaft 5 with a pivot 6.
  • the pivot 6 is eccentrically located on the the motor shaft 5 such that it is imparted an eccentric rotary movement relative to said shaft 5 when said shaft rotates.
  • a grinding means 7 can be threaded onto the pivot 6. When the motor shaft 5 rotates, the grinding means 7 will be imparted or brought to perform an eccentric rotary movement.
  • the grinding apparatus 1 is at the top provided with a support device 8 having lower and upper support surfaces 8a, 8b which define a gap 8c in which the knife blade 2 can be placed for grinding or sharpening.
  • a support device 8 having lower and upper support surfaces 8a, 8b which define a gap 8c in which the knife blade 2 can be placed for grinding or sharpening.
  • the knife blade 2 When the knife blade 2 has been placed in the gap 8c, it is set in a grinding or sharpening position S and can be moved in its longitudinal direction L in a reciprocating manner relative to the support device 8 for sharpening by means of the grinding means 7.
  • the angle ⁇ of the support device 8 relative to the grinding means 7 can be set by means of a steering wheel 9 such that the knife blade 2 can be imparted various angular positions relative to the grinding means 7.
  • the grinding means 7 includes at least one permanent magnet 10 which, through attraction by the knife blade 2 when said knife blade is located in sharpening position S, pulls the grinding means 7 into engagement with the knife blade 2 and holds the grinding means in engagement therewith during grinding or sharpening.
  • the magnet 10 is preferably located such that its magnetic force during sharpening holds the grinding means 7 in engagement with the knife blade 2 with a force which is constant and adapted to the grinding or abrasive material on the grinding means.
  • the permanent magnet 10 may preferably be located such that particles ground from the knife blade 2 repel each other magnetically and can therefore, not get packed in the grinding means 7.
  • the grinding means 7 comprises a bearing sleeve 11 and a circular plate 12.
  • the plate 12 may have grinding material on its upper side or may be provided with a grinding plate 13 which on its upper side have grinding material and on its lower side a self-adhering layer.
  • the grinding plate 13 can be attached to the plate 12 and when the grinding material is used up, said grinding plate can be replaced by another grinding plate 13.
  • the grinding means 7 is mounted displaceable in an axial direction on the pivot 6. This means that when the knife 3 is placed with the knife blade 2 in grinding or sharpening position S, the permanent magnet 10 will pull the grinding means 7 from a lower, inactive position A (illustrated with solid lines in fig. 2) to an active position B (illustrated with broken lines in fig. 2) in which it cooperates with the knife blade 2. When after grinding or sharpening the blade 2 of the knife 3 is removed from the sharpening position S, the grinding means 7 will automatically fall down into its inactive position A because of its dead weight. Thus, the permanent magnet 10 pulls the grinding means 7 upwards a small distance C from inactive position A to active position B and when the knife blade 2 has been removed from the sharpening position S, the grinding means 7 falls back a corresponding distance C.
  • the grinding means 7 can be removed from the pivot 6 (e.g. by lifting or turning away the support device 8 and then lift the grinding means 7 off the pivot 6) for replacement by a new grinding means 7 and/or a grinding means 7 with a permanent magnet 10 having another magnetic force, i.e. having greater or less magnetic force.
  • the exemplified device may comprise two grinding means 7, namely a rough grinding means 7a and a fine grinding means 7b.
  • the rough grinding means 7a is adapted for an initial, rough or coarse grinding or sharpening of the knife blade 2 and the fine grinding means 7b for a final, fine sharpening thereof.
  • the rough and fine grinding means 7a, 7b are in the present embodiment different from each other, while the rough grinding means 7a has a grinding plate 13 with rougher grinding surfaces than the corresponding grinding plate 13 on the fine grinding means 7b and while the rough grinding means 7a is adapted for constrained rotation with the pivot 6.
  • the fine grinding means 7b however, is provided not necessarily to follow the rotation of the pivot 6, but at least its eccentric movement.
  • its bearing sleeve 11 may have a radially outwards directed flange 14 which engages, longitudinally displaceable therein, a groove 15 in the pivot 6.
  • the bearing sleeve 11 of the fine grinding means 7b however, has no flange corresponding to the flange 14 and is therefore not rotated by force by the motor shaft 5, but may rotate on the pivot 6 while it thus is brought to follow the eccentric movement thereof.
  • the grinding apparatus 1 may be of a totally different type than shown; the support device 8 may be of a totally different type than shown; there may be only one grinding means 7 instead of one rough grinding means and one fine grinding means the grinding means may have a plate 12 the upper side of which is directly coated with an abrasive material instead of having a grinding plate 13 with grinding or abrasive material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The present invention relates to a device for grinding or sharpening knife blades or similar, wherein at least one grinding means (7) is provided to perform sharpening movements for grinding or sharpening the knife blade (2) and wherein the knife blade (2) can be located in at least one sharpening position (S) in a support device (8) in order to permit sharpening of said knife blade (2) by means of the grinding means (7). The grinding means (7) comprises at least one permanent magnet (10) which through attraction by the knife blade (2) is provided to pull the grinding means (7) to the knife blade (2) such that said grinding means (7) engages the knife blade (2) when said knife blade (2) is located in sharpening position (S), and to hold the grinding means (7) in engagement with the knife blade (2) during grinding or sharpening.

Description

Device and grinding means for sharpening of knife blades or similar.
The present invention relates to a device for grinding or sharpening knife blades or similar, wherein at least one grinding means is provided to perform sharpening movements for grinding or sharpening the knife blade. The knife blade can be located in at least one sharpening position in a support device in order to permit sharpening of said knife blade by means of the grinding means. The invention further relates to grinding means for sharpening knife blades or similar.
During sharpening of knife blades, e.g. knife blades for cook's knives, the sharpening result depends on how the knife is handled during the sharpening operation. If e.g. the knife blade is momentarily pressed too hard or too loose against the grinding means, the sharpening result will be unacceptable.
The object of the present invention is to remedy said problem and this is arrived at by providing the abovementioned device primarily with the characterizing features of subsequent claim 1 or 13.
Since the grinding means is attracted to the knife blade by a magnet and held in contact therewith by the magnetic force of the magnet, it is ensured that the sharpening result will be independent of or at least less dependent of how the knife is handled during sharpening. The invention will be further described below with reference to the accompanying drawings, in which fig. 1 is a perspective view of a grinding apparatus with a device according to the invention; fig. 2 is a section through members of the device of fig. 1 ; and fig. 3 is a section along the line Ill-Ill through members of fig. 2.
The grinding apparatus 1 illustrated in fig. 1 is preferably adapted for grinding or sharpening knife blades 2 on knives 3 for cooks for cutting foodstuff, but can be used for sharpening knife blades of other knives. The knife blade 2 consists of a suitable metallic material, preferably steel. The grinding apparatus 1 may comprise an electric motor 4 which preferably can be connected to the supply mains. The electric motor 4 has a shaft 5 with a pivot 6. The pivot 6 is eccentrically located on the the motor shaft 5 such that it is imparted an eccentric rotary movement relative to said shaft 5 when said shaft rotates. A grinding means 7 can be threaded onto the pivot 6. When the motor shaft 5 rotates, the grinding means 7 will be imparted or brought to perform an eccentric rotary movement. The grinding apparatus 1 is at the top provided with a support device 8 having lower and upper support surfaces 8a, 8b which define a gap 8c in which the knife blade 2 can be placed for grinding or sharpening. When the knife blade 2 has been placed in the gap 8c, it is set in a grinding or sharpening position S and can be moved in its longitudinal direction L in a reciprocating manner relative to the support device 8 for sharpening by means of the grinding means 7.
The angle α of the support device 8 relative to the grinding means 7 can be set by means of a steering wheel 9 such that the knife blade 2 can be imparted various angular positions relative to the grinding means 7.
The grinding means 7 includes at least one permanent magnet 10 which, through attraction by the knife blade 2 when said knife blade is located in sharpening position S, pulls the grinding means 7 into engagement with the knife blade 2 and holds the grinding means in engagement therewith during grinding or sharpening. The magnet 10 is preferably located such that its magnetic force during sharpening holds the grinding means 7 in engagement with the knife blade 2 with a force which is constant and adapted to the grinding or abrasive material on the grinding means.
The permanent magnet 10 may preferably be located such that particles ground from the knife blade 2 repel each other magnetically and can therefore, not get packed in the grinding means 7.
At the illustrated embodiment, the grinding means 7 comprises a bearing sleeve 11 and a circular plate 12. The plate 12 may have grinding material on its upper side or may be provided with a grinding plate 13 which on its upper side have grinding material and on its lower side a self-adhering layer. Hereby, the grinding plate 13 can be attached to the plate 12 and when the grinding material is used up, said grinding plate can be replaced by another grinding plate 13.
The grinding means 7 is mounted displaceable in an axial direction on the pivot 6. This means that when the knife 3 is placed with the knife blade 2 in grinding or sharpening position S, the permanent magnet 10 will pull the grinding means 7 from a lower, inactive position A (illustrated with solid lines in fig. 2) to an active position B (illustrated with broken lines in fig. 2) in which it cooperates with the knife blade 2. When after grinding or sharpening the blade 2 of the knife 3 is removed from the sharpening position S, the grinding means 7 will automatically fall down into its inactive position A because of its dead weight. Thus, the permanent magnet 10 pulls the grinding means 7 upwards a small distance C from inactive position A to active position B and when the knife blade 2 has been removed from the sharpening position S, the grinding means 7 falls back a corresponding distance C.
The grinding means 7 can be removed from the pivot 6 (e.g. by lifting or turning away the support device 8 and then lift the grinding means 7 off the pivot 6) for replacement by a new grinding means 7 and/or a grinding means 7 with a permanent magnet 10 having another magnetic force, i.e. having greater or less magnetic force. The exemplified device may comprise two grinding means 7, namely a rough grinding means 7a and a fine grinding means 7b. The rough grinding means 7a is adapted for an initial, rough or coarse grinding or sharpening of the knife blade 2 and the fine grinding means 7b for a final, fine sharpening thereof. The rough and fine grinding means 7a, 7b are in the present embodiment different from each other, while the rough grinding means 7a has a grinding plate 13 with rougher grinding surfaces than the corresponding grinding plate 13 on the fine grinding means 7b and while the rough grinding means 7a is adapted for constrained rotation with the pivot 6. The fine grinding means 7b however, is provided not necessarily to follow the rotation of the pivot 6, but at least its eccentric movement. In order to accomplish that the rough grinding means 7a is forced to follow the rotary movement of the pivot 6, its bearing sleeve 11 may have a radially outwards directed flange 14 which engages, longitudinally displaceable therein, a groove 15 in the pivot 6. The bearing sleeve 11 of the fine grinding means 7b however, has no flange corresponding to the flange 14 and is therefore not rotated by force by the motor shaft 5, but may rotate on the pivot 6 while it thus is brought to follow the eccentric movement thereof.
The invention is not limited to the embodiment described above and illustrated in the drawings, but its shape and function may vary within the scope of the following claims. Thus, the grinding apparatus 1 may be of a totally different type than shown; the support device 8 may be of a totally different type than shown; there may be only one grinding means 7 instead of one rough grinding means and one fine grinding means the grinding means may have a plate 12 the upper side of which is directly coated with an abrasive material instead of having a grinding plate 13 with grinding or abrasive material.

Claims

Claims:
1. Device for grinding or sharpening knife blades or similar, wherein at least one grinding means (7) is provided to perform sharpening movements for grinding or sharpening the knife blade (2), and wherein the knife blade (2) can be located in at least one sharpening position (S) in a support device (8) in order to permit sharpening of said knife blade (2) by means of the grinding means (7), characterized in that the grinding means (7) comprises at least one permanent magnet (10) which through attraction by the knife blade (2) is provided to pull the grinding means (7) to the knife blade (2) such that said grinding means (7) engages the knife blade (2) when said knife blade (2) is located in sharpening position (S), and to hold the grinding means (7) in engagement with the knife blade (2) during grinding or sharpening.
2. Device according to claim 1 , characterized in that the permanent magnet (10) is provided to attract particles which have been ground off from the knife blade (2) in order to counteract adherence thereof to the grinding surfaces of the grinding means (7).
3. Device according to claim 1 or 2, characterized in that the grinding means (7) has a permanent magnet (10) with a certain magnetic force and is replaceable by a grinding means (7) having a permanent magnet (10) with another magnetic force.
4. Device according to any preceding claim, characterized in that the grinding means (7), through the magnetic force of the permanent magnet (10), is movable from an inactive position (A) to an active position (B) in which it can cooperate with the knife blade (2), and that the grinding means (7) by means of its dead weight is provided to automatically return to the inactive position (B) after removal of the knife blade (2) from the grinding or sharpening position (S).
5. Device according to any preceding claim, characterized in that the grinding means (7) has a releasably mounted grinding plate (13).
6. Device according to claim 5, characterized in that the grinding plate (13) has grinding or abrasive material on one side and self-adhering material on an opposite side.
7. Device according to any preceding claim, characterized in that the grinding means (7) has or is connected to a bearing sleeve (11) which can be threaded onto and removed from a rotatable pivot (6).
8. Device according to any preceding claim, characterized in that the grinding means (7) is provided to be brought to perform an eccentric rotary movement relative to a rotating motor shaft (5) or similar.
9. Device according to any preceding claim, characterized in that it comprises at least two grinding means, namely at least one rough grinding means (7a) which is adapted for rough or coarse grinding or sharpening of the knife blade (2), and at least one fine grinding means (7b) which is adapted for fine sharpening of the knife blade (2), and that the rough grinding means (7a) is provided replaceable by the fine grinding means (7b).
10. Device according to claim 9, characterized in that the rough grinding means (7a) is provided to be brought to perform an eccentric rotary movement about a driven motor shaft (5) or similar as well as a rotary movement about its own axis, and that fine grinding means (7b) is provided to be brought to perform an eccentric rotary movement about the motor shaft (5), but not a forced rotary movement about its own axis.
11. Device according to any preceding claim, characterized in that the support device (8) can be set to for imparting various angular positions (α) to the knife blade (2) relative to the grinding means (7).
12. Device according to any preceding claim, characterized in that the knife blade (2) is the blade of a cook's knife (3), e.g. for cutting foodstuff.
13. Grinding means for grinding or sharpening knife blades or similar, characterized in that the grinding means (7) comprises at least one permanent magnet (10) which is provided to pull said grinding means (7) to and hold it in cooperation with the knife blade (2) for grinding or sharpening thereof.
14. Grinding means according to claim 13, characterized in that the permanent magnet (10) is provided to attract particles which have been ground off from the knife blade (2) in order to counteract adherence thereof to the grinding surfaces of the grinding means (7).
15. Grinding means according to claim 13 or 14, characterized in that the grinding means (7) has a permanent magnet (10) with a certain magnetic force and is replaceable by a grinding means (7) having a permanent magnet (10) with another magnetic force.
16. Grinding means according to any one of claims 13-15, characterized in that the grinding means (7), through the magnetic force of the permanent magnet (10), is movable from an inactive position (A) to an active position (B) in which it can cooperate with the knife blade (2), and that the grinding means (7) by means of its dead weight is provided to automatically return to the inactive position (B) after removal of the knife blade (2) from the grinding or sharpening position (S).
17. Grinding means according to any one of claims 13-16, characterized in that the grinding means (7) has a releasably mounted grinding plate (13).
18. Grinding means according to any one of claims 13-17, characterized in that the grinding plate (13) has grinding or abrasive material on one side and self-adhering material on an opposite side.
19. Grinding means according to any one of claims 13-18, characterized in that the grinding means (7) has or is connected to a bearing sleeve (11 ) which can be threaded onto and removed from a rotatable pivot (6).
20. Grinding means according to any one of claims 13-19, characterized in that the grinding means (7) is provided to be brought to perform an eccentric rotary movement relative to a rotating motor shaft (5) or similar.
21. Grinding means according to any one of claims 13-20, characterized in that it comprises at least two grinding means, namely at least one rough grinding means (7a) which is adapted for rough or coarse grinding or sharpening of the knife blade (2), and at least one fine grinding means (7b) which is adapted for fine sharpening of the knife blade (2), and that the rough grinding means (7a) is provided replaceable by the fine grinding means (7b).
22. Grinding means according to claim 21 , characterized in that the rough grinding means (7a) is provided to be brought to perform an eccentric rotary movement about a driven motor shaft (5) or similar as well as a rotary movement about its own axis, and that fine grinding means (7b) is provided to be brought to perform an eccentric rotary movement about the motor shaft (5), but not a forced rotary movement about its own axis.
23. Grinding means according to any one of claims 13-22, characterized in that the grinding means (7) can be located in such a relationship to a support device (8) in which the knife blade (2) can be placed, that the permanent magnet (10) pulls the grinding means (7) into cooperation with the knife blade (2) when said knife blade (2) is placed in the support device (8).
24. Grinding means according to any one of claims 13-22, characterized in that the grinding means (7) is provided for grinding or sharpening of knife blades (2), preferably for knives (3) which are intended for use by cooks.
PCT/SE2006/000604 2005-06-03 2006-05-24 Device and grinding means for sharpening of knife blades or similar. WO2006130070A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP06733429A EP1899108A4 (en) 2005-06-03 2006-05-24 Device and grinding means for sharpening of knife blades or similar

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0501268A SE528717C2 (en) 2005-06-03 2005-06-03 Apparatus and grinding means for grinding knife blades or the like
SE0501268-7 2005-06-03

Publications (1)

Publication Number Publication Date
WO2006130070A1 true WO2006130070A1 (en) 2006-12-07

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Application Number Title Priority Date Filing Date
PCT/SE2006/000604 WO2006130070A1 (en) 2005-06-03 2006-05-24 Device and grinding means for sharpening of knife blades or similar.

Country Status (3)

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EP (1) EP1899108A4 (en)
SE (1) SE528717C2 (en)
WO (1) WO2006130070A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2703120A1 (en) * 2011-04-26 2014-03-05 Kai R & D Center Co., Ltd. Electric cutting-tool grinder

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4832282A (en) 1971-09-02 1973-04-27
GB2132520A (en) * 1982-12-09 1984-07-11 Dick Friedr Gmbh Grinding machine
US4716689A (en) * 1984-03-12 1988-01-05 Friel Daniel D Methods and apparatus for knife and blade sharpening
US5449315A (en) * 1984-03-12 1995-09-12 Edgecraft Corporation Portable manual sharpener for knives and the like
US5620359A (en) * 1994-10-07 1997-04-15 Cuisine De France, Ltd. Knife sharpener
DE10044614A1 (en) 1999-10-30 2001-05-10 Georg Krause Device for sharpening cutting tools has base body with smoothing and activating unit covered by protective grid and with locally fixed storage unit and metal magnetised slide elements

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4832282A (en) 1971-09-02 1973-04-27
GB2132520A (en) * 1982-12-09 1984-07-11 Dick Friedr Gmbh Grinding machine
US4716689A (en) * 1984-03-12 1988-01-05 Friel Daniel D Methods and apparatus for knife and blade sharpening
US5449315A (en) * 1984-03-12 1995-09-12 Edgecraft Corporation Portable manual sharpener for knives and the like
US5620359A (en) * 1994-10-07 1997-04-15 Cuisine De France, Ltd. Knife sharpener
DE10044614A1 (en) 1999-10-30 2001-05-10 Georg Krause Device for sharpening cutting tools has base body with smoothing and activating unit covered by protective grid and with locally fixed storage unit and metal magnetised slide elements

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1899108A4

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2703120A1 (en) * 2011-04-26 2014-03-05 Kai R & D Center Co., Ltd. Electric cutting-tool grinder
EP2703120A4 (en) * 2011-04-26 2015-04-01 Kai R&D Center Co Ltd Electric cutting-tool grinder
US9073166B2 (en) 2011-04-26 2015-07-07 Kai R&D Center Co., Ltd. Electric cutting-tool grinder

Also Published As

Publication number Publication date
SE528717C2 (en) 2007-01-30
EP1899108A1 (en) 2008-03-19
EP1899108A4 (en) 2009-12-16
SE0501268L (en) 2006-12-04

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