KNIFE SHARPENER
A knife sharpener is made up of a housing containing a sanding belt and a driving system that engages the belt to cause it to move in a sharpening area where a knife can come into contact with the sanding belt. The knife sharpener also includes a first angle guide having a surface against which a first side of a knife can be positioned so the edge of the knife can be positioned in the sharpening area, a second angle guide having a surface against which a second side of the knife can be positioned so the edge of the knife can be positioning in the sharpening area, and an angle adjustment mechanism that can adjust the angle of the first angle guide and the second angle guide to change the angle of the surfaces relative to the sanding belt.
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The present application claims the benefit of domestic priority based on U.S. Provisional Patent Application 62/678,198 filed on May 30, 2018, the entirety of which is incorporated herein by reference.
BACKGROUNDAs Washington Irving said, “a sharp tongue is the only edge-tool that grows keener with constant use.” For everything else, a good sharpener is needed. The art of knife sharpening has been honed throughout the ages. From the ancient days of the samurai warriors to the modern days of the iron chefs, a knife wielder is only as effective as the sharpness of his or her blade.
The ease and convenience of knife sharpening has become of paramount importance in today's world. Users no longer want to sit in front of a grinding stone, use a manual knife sharpener, or pay the expense of sending out their knives to have them professionally sharpened. Gadgets and machines have been developed to make the process as simple and effective as possible for cooks and tool users. One such type of sharpener uses a moving sanding belt that can be used to grind the edge of a knife.
However, the belt sharpeners currently available all suffer from one or more drawbacks. For example, current belt sharpeners are designed to only allow for easy and/or consistent grinding of one side of the edge of a knife. In addition, the belt sharpeners do not allow a user to precisely select the angle of grinding over a wide range of angles. Furthermore, conventional belt sharpeners are not able to accurately and consistently grind at a desired angle due to the flexibility of the belt. Moreover, belt sharpeners generate dust and debris that can create a hazardous and/or unclean environment near the sharpener.
There is therefore a need for an improved knife sharpener. There is further a need for a knife sharpener that can easily and consistently grind both sides of the edge of a knife. There is still a further need for a knife sharpener that can precisely select and/or monitor the angle of grind over a wide range of angles. There is still further a need for a knife sharpener that can lessen the inaccuracy and/or inconsistency of angle grinds that result from the flexibility of a sanding belt. There is still further a need for a knife sharpener that can collect dust and debris generated during knife sharpening.
SUMMARYThe present invention satisfies these needs. In one aspect of the invention, a knife sharpener allows for improved knife sharpening.
In another aspect of the invention, a knife sharpener comprises a sanding belt that can easily and consistently grind both sides of the edge of a knife.
In another aspect of the invention, a knife sharpener comprises an angle guide that allows a user to precisely select and/or monitor the angle of sharpening over a wide range of angles.
In another aspect of the invention, a knife sharpener comprises a sanding belt and includes a manner of preventing deflection of the sanding belt during the sharpening process.
In another aspect of the invention, a knife sharpener comprises an electromagnet for collecting dust and debris that results from the sharpening process.
In another aspect of the invention, a knife sharpener comprises a housing containing a sanding belt and a driving system that engages the belt to cause it to move in a sharpening area where a knife can come into contact with the sanding belt; a first angle guide having a surface against which a first side of a knife can be positioned so the edge of the knife can be positioned in the sharpening area; a second angle guide having a surface against which a second side of the knife can be positioned so the edge of the knife can be positioning in the sharpening area; and an angle adjustment mechanism that can adjust the angle of the first angle guide and the second angle guide to change the angle of the surfaces relative to the sanding belt.
In another aspect of the invention, a knife sharpener comprises a housing containing a sanding belt and a driving system that engages the belt to cause it to move in a sharpening area where a knife can come into contact with the sanding belt; an angle guide having a surface against which a side of a knife can be positioned so the edge of the knife can be positioned in the sharpening area; an angle adjustment mechanism that can adjust the angle of the angle guide to change the angle of the surface relative to the sanding belt; and a sanding belt platform beneath the sanding belt in the sharpening area, the sanding belt platform including a surface that limits the amount of deflection of the sanding belt when the sanding belt is contacted by a knife.
In another aspect of the invention, a knife sharpener comprises a housing containing a sanding belt and a driving system that engages the belt to cause it to move in a sharpening area where a knife can come into contact with the sanding belt; an angle guide having a surface against which a side of a knife can be positioned so the edge of the knife can be positioned in the sharpening area; an angle adjustment mechanism that can adjust the angle of the angle guide to change the angle of the surface relative to the sanding belt; and a magnet below the sanding belt, wherein the magnet attracts dust and debris generated when the knife contacts the sanding belt.
These features, aspects, and advantages of the present invention will become better understood with regard to the following description, appended claims, and accompanying drawings which illustrate exemplary features of the invention. However, it is to be understood that each of the features can be used in the invention in general, not merely in the context of the particular drawings, and the invention includes any combination of these features, where:
The present invention relates to a knife sharpener. Although the knife sharpener is illustrated and described in the context of being useful for sharpening knives, the present invention can be useful in other instances. Accordingly, the present invention is not intended to be limited to the examples and embodiments described herein.
To sharpen a knife using the knife sharpener 100, the knife edge is brought into contact with the sanding belt 110 in the sharpening area 120 of the knife sharpener 100. As the sanding belt 110 rotates in its loop, different portions of the sanding belt 110 will enter into the sharpening area 120. When the edge of the knife contacts the sanding belt 110, a portion of the edge is ground by the sanding belt 110. The angle of the knife when it contacts the sanding belt 110 will determine the sharpness of the edge of the knife.
In one version of the knife sharpener 100, an angle guide 125 is provided for maintaining the knife at a desired angle relative to the sanding belt 110 in the sharpening area 120. The angle guide 125 has a substantially flat surface 130 on which the side of a knife can be positioned so the knife can be directed toward the sharpening area 120. When maintained in the position on the surface 130, the edge of the knife is maintained at a desired angle relative to the sanding belt 110 and the edge is ground to a desired sharpness. The angle guide 125 can also include a guard 135 for improved and/or safer sharpening. The guard 135 can extend substantially parallel to the surface 130 to create a slot 140 into which the knife can be inserted. In another version, the guard 135 can be positioned at a slight angle relative to the surface 130 to create a slightly tapered slot 140. In this tapered version, the surface 130 and the guard 135 can provide a clamping action on the knife. The guard 135 helps to maintain the knife at the desired angle. In addition, the guard 135 helps to prevent the knife from being kicked upwardly when it contacts the rotating sanding belt 110 thus helping to prevent injury to a user.
In one version, the angle guide 125 of the knife sharpener 100 can include an angle adjustment mechanism 145 that adjusts the angle of the angle guide 125 relative to the sanding belt 110 in the sharpening area 120. In the version shown, the angle adjustment mechanism 145 includes an angle adjustment knob 150 that can be turned to change the angle of the angle guide 125. As can be seen in
The knife sharpener 100 can also have a second angle guide 155. The second angle guide 155 includes a substantially flat surface 160 that functions in similar manner as the surface 130 of the first angle guide 125. Similarly, the second angle guide 155 can also include a second angle guide guard 165 that creates a slot 170 with the second angle guide surface 160 as with the first angle guide 125. The second angle guide 155 can be positioned at an angle, b, relative to the sanding belt 110. The angle, b, can be any of the above-mentioned angles discussed in connection with angle, a, of the first angle guide 125. In one version, the second angle guide 155 can be positioned at an angle, b, that is the same as but opposite to the angle of the first angle guide 125. As can be seen in
In use, the knife sharpener 100 can be used to sharpen one or both side of the edge of a knife blade. In its simplest use, the angle guide 125 can be positioned at a desired angle, and a knife can be inserted into the slot 140. As the sanding belt 110 rotates through the sharpening area 120, it will grind one side of the edge of the knife blade. In one version, the sanding belt 110 can rotate so that it moves towards the edge of the knife, i.e. from left to right in
The knife sharpener 100 can also be used to grind the other side of the edge of the knife. This can be accomplished in a number of manners. When a single angle guide 125 is used, the knife can be removed from the slot 140 after the first side of the edge is ground and then flipped over and reinserted from the backside of the housing 105 to grind the other side of the edge. When the second angle guide 155 is provided, both sides of the edge of the knife can be ground from the same side of the housing 105. In this version, after the knife is ground in the first angle guide 125, the knife is removed from the slot 140 and inserted into the slot 170 in the second angle guide 155 so that the second side of the knife edge contacts the sanding belt 110. In this method the sanding belt can either continue to rotate in the same direction for both grinds or can be switched to rotate in the reverse direction for the second grind. When in the sanding belt 110 direction is reversed, both sides of the knife are ground by the sanding belt 110 moving towards the knife edge or both sides are ground by the sanding belt 110 moving away from the knife edge. This can produce a cleaner and more even knife edge.
A sanding belt 110 driving system 200 for use with one version of a knife sharpener 100 of the invention is shown in
The sanding belt 110 can also be removable and replaceable. As can be seen in
As also shown in
A version of the knife sharpener 100 can include a digital protractor 285 or angle monitor as shown in
The rotation of the first circular plate 405 and the corresponding rotation of the second circular plate 410 can be performed manually, such as by a rotatable knob, or can be performed automatically.
One or more magnets, such as one or more electromagnets, may be provided within the housing 105 of the knife sharpener 100. The electromagnet may be positioned near the sharpening area 120 so that the electromagnet attracts debris 450 that is ground off the knife during the sharpening process. After sharpening, the electromagnet can be turned off, so the debris can be removed.
The housing 105 may have a top portion that is pivotally attached to a bottom portion so that access to the interior of the housing can be obtained. This allows for the changing of sanding belt 110, cleaning, repair, and the like. In another version, the top portion can be liftable from the bottom portion to provide the access.
The housing 105 and the knife sharpener 100 can be any suitable size. For example, the width of the housing may be from about 5 cm to about 50 cm, or from about 15 cm to about 30 cm. The width of the sanding belt can be from about 3 cm to about 13 cm, and in one version is about 8 cm.
In another version of the use of the knife sharpener 100, the underside of the angle guide 125 can be used as a guide for the knife to be sharpened. This is particularly useful for sharpening chisels. The back of the knife can be placed against the underside of the angle guide 125. The user would then push the knife towards the sanding belt 110 to cut the desired angle into the blade.
In another version of the knife sharpener 100, the sanding belt 110 can be replaced by a different type of moving coarse surface. For example, the course surface may oscillate or vibrate back and forth from front to back or from side to side.
Although the present invention has been described in considerable detail with regard to certain preferred versions thereof, other versions are possible, and alterations, permutations and equivalents of the version shown will become apparent to those skilled in the art upon a reading of the specification and study of the drawings. For example, the cooperating components may be reversed or provided in additional or fewer number. Also, the various features of the versions herein can be combined in various ways to provide additional versions of the present invention. Furthermore, certain terminology has been used for the purposes of descriptive clarity, and not to limit the present invention. Throughout this specification and any claims appended hereto, unless the context makes it clear otherwise, the term “comprise” and its variations such as “comprises” and “comprising” should be understood to imply the inclusion of a stated element, limitation, or step but not the exclusion of any other elements, limitations, or steps. Therefore, any appended claims should not be limited to the description of the preferred versions contained herein and should include all such alterations, permutations, and equivalents as fall within the true spirit and scope of the present invention.
Claims
1. A knife sharpener comprising:
- a housing containing a sanding belt and a driving system that engages the belt to cause it to move in a sharpening area where a knife can come into contact with the sanding belt;
- a first angle guide having a surface against which a first side of a knife can be positioned so the edge of the knife can be positioned in the sharpening area;
- a second angle guide having a surface against which a second side of the knife can be positioned so the edge of the knife can be positioning in the sharpening area; and
- an angle adjustment mechanism that can adjust the angle of the first angle guide and the second angle guide to change the angle of the first angle guide and the second angle guide relative to the sanding belt.
2. A knife sharpener according to claim 1 wherein the angle adjustment mechanism simultaneously adjusts the first angle guide and the second angle guide so that the angles are equal but opposite.
3. A knife sharpener according to claim 2 wherein the angle adjustment mechanism comprises a knob connected to a pulley system.
4. A knife sharpener according to claim 2 wherein the angle adjustment mechanism comprises a first plate connected to the first angle guide and a second plate connected to the second angle guide, each plate including teeth that engage with one another.
5. A knife sharpener according to claim 2 wherein the angle adjustment mechanism comprises an electronic adjustment system with a rotary encoder.
6. A knife sharpener according to claim 1 wherein the knife sharpener includes a display that displays the angle of the first angle guide relative to the sanding belt.
7. A knife sharpener according to claim 1 wherein the first angle guide includes a guard that together with the surface of the first angle guide defines a slot into which the knife may be inserted.
8. A knife sharpener according to claim 1 wherein the angle of the first angle guide can be adjusted so the angle of the leading edge of the knife relative to the sanding belt can range from about 5 degrees or less to about 80 degrees or more.
9. A knife sharpener according to claim 1 wherein the angle of the first angle guide can be adjusted so the angle of the leading edge of the knife to the sanding belt can range from about 0 degrees to about 90 degrees.
10. A knife sharpener according to claim 1 wherein the sanding belt is in the form of a loop.
11. A knife sharpener according to claim 1 wherein the driving system can drive the sanding belt is more than one direction.
12. A knife sharpener according to claim 1 wherein the driving system can drive the sanding belt at variable speeds.
13. A knife sharpener according to claim 1 wherein the housing includes a sanding belt platform on the side of the sanding belt opposite the side that can contact the knife in the sharpening area, the sanding belt platform including a surface that limits the amount of deflection of the sanding belt when the sanding belt is contacted by a knife.
14. A knife sharpener according to claim 1 wherein the housing includes a magnet below the sanding belt, wherein the magnet attracts dust and debris generated when the knife contacts the sanding belt.
15. A knife sharpener comprising:
- a housing containing a sanding belt and a driving system that engages the belt to cause it to move in a sharpening area where a knife can come into contact with the sanding belt;
- an angle guide having a surface against which a side of a knife can be positioned so the edge of the knife can be positioned in the sharpening area;
- an angle adjustment mechanism that can adjust the angle of the angle guide to change the angle of the angle guide relative to the sanding belt; and
- a sanding belt platform on the side of the sanding belt opposite the side that can contact the knife in the sharpening area, the sanding belt platform including a surface that limits the amount of deflection of the sanding belt when the sanding belt is contacted by a knife.
16. A knife sharpener according to claim 15 wherein the angle adjustment mechanism comprises an electronic adjustment system with a rotary encoder.
17. A knife sharpener according to claim 15 wherein the knife sharpener includes a display that displays the angle of the angle guide relative to the sanding belt.
18. A knife sharpener according to claim 15 wherein the first angle guide includes a guard that together with the surface of the angle guide defines a slot into which the knife may be inserted, and wherein the angle of the angle guide is measured from the midpoint of the slot.
19. A knife sharpener comprising:
- a housing containing a sanding belt and a driving system that engages the belt to cause it to move in a sharpening area where a knife can come into contact with the sanding belt;
- an angle guide having a surface against which a side of a knife can be positioned so the edge of the knife can be positioned in the sharpening area;
- an angle adjustment mechanism that can adjust the angle of the angle guide to change the angle of the angle guide relative to the sanding belt; and
- a magnet below the sanding belt, wherein the magnet attracts dust and debris generated when the knife contacts the sanding belt.
20. A knife sharpener according to claim 19 wherein the magnet is an electromagnet.
Type: Application
Filed: May 30, 2019
Publication Date: Dec 5, 2019
Applicant: NoCry OU (Saaremaa)
Inventor: Cameron Brewer (Tallinn)
Application Number: 16/426,745