KNIFE SHARPENER

FIELD

The disclosure relates to a knife sharpener, and more particularly to a knife sharpener with an interchangeable knife guide cartridge.

BACKGROUND

Knives made in multiple locations around the world vary widely in their style, in shape, in the type of metals utilized, in the hardness of the blades, in the contours of the blade faces, the slope of the blade faces, the number of primary edge facets (one or two), created to form the edge, and most importantly the edge angle of the knife blade. For instance, knives from Asia are generally sharpened at very low edge angles at about 15° relative to vertical. Whereas knives of European, American or Western countries generally are sharpened at higher edge angles of about 20° relative to vertical. Knives in Asia have been used widely for fish and softer foods while the Western countries have consumed more meat and tougher foods more difficult to cut. Hence, the Western countries have adopted the larger 20° edge angle that will hold an edge longer in difficult cutting situations. Successive generations have searched for sharper and stronger edges and the sharpening means to create them on the knives that are common to their culture.

Modern blade sharpeners are precision multistage devices that require successive stages to sharpen just one class of knives and depend upon precise control of sharpening in order to obtain the sharpest knives. In order to develop the sharpest edges, it is important that the knife blade and a surface of an abrasive material being used to sharpen the knife blade be held in a consistent angular position on each sharpening stroke across the abrasive material.

Because of the dominance of 20° edge angle on knives in the Western countries virtually all modern precision knife sharpeners have been designed to sharpen knives to achieve only such 20° edge angle. As a consequence, those who prefer Asian blades commonly find it necessary to hand sharpen to achieve the smaller 15° edge angle.

Recently, Asian knives have become more popular in the Western countries and consequently, sharpeners that achieve exclusively a 15° edge angle have been introduced. In addition to the sharpeners designed exclusively for either the 15° angle or the 20° angle, there are also specialized sharpeners for various other types of knives, for example, hunting knives.

In the face of growing precision and complexity of these modern specialized precision sharpeners, it would be desirable and advantageous to develop a knife sharpener with interchangeable knife guides for improved operation and versatility, while optimizing blade sharpening.

SUMMARY

In concordance and agreement with the presently described subject matter, a knife sharpener with interchangeable knife guides for improved operation and versatility, while optimizing blade sharpening, has surprisingly been developed.

In one embodiment, a knife sharpener, comprises: a housing having at least one first sharpening disk disposed therein; and an interchangeable knife guide cartridge releaseably coupled to the housing to facilitate a sharpening of a knife blade by the at least one first sharpening disk.

According to aspects of some embodiments, the knife guide cartridge is configured for a three-stage sharpening of the knife blade.

According to aspects of some embodiments, the interchangeable knife guide cartridge includes at least one knife guide comprising at least one guide plane and at least guide spring configured to urge the knife blade against the at least one guide plane.

According to aspects of some embodiments, the at least one guide plane is angled at 15 degrees relative to vertical.

According to aspects of some embodiments, the at least one guide plane is angled at 20 degrees relative to vertical.

According to aspects of some embodiments, an angle of the at least one guide plane in a first sharpening stage is different from an angle of the at least one guide plane in a second sharpening stage of the knife sharpener.

According to aspects of some embodiments, wherein an angle of the at least one guide plane in a first sharpening stage is the same as an angle of the at least one guide plane in a second sharpening stage of the knife sharpener.

According to aspects of some embodiments, the at least one guide spring includes at least one spring arm extending along a corresponding one of the at least one guide plane.

According to aspects of some embodiments, the at least one knife guide comprises a pair of the guide planes disposed on opposing sides of the at least one guide spring.

According to aspects of some embodiments, the interchangeable knife guide cartridge includes at least one guide post configured to cooperate with at least one guide pocket of an attachment module of the housing.

According to aspects of some embodiments, the interchangeable knife guide cartridge includes at least one coupling element configured to cooperate with at least one retain/release element of an attachment module of the housing to releasably couple the interchangeable knife guide cartridge to the housing.

According to aspects of some embodiments, the knife sharpener further comprises an actuator configured to cooperate with the attachment module to release the interchangeable knife guide cartridge from the housing.

According to aspects of some embodiments, the knife sharpener further comprises at least one stropping disk disposed in the housing.

According to aspects of some embodiments, the knife sharpener further comprises a dresser mechanism configured to selectively contact a surface of the at least one stropping disk to remove any irregularities or undesired particles therefrom.

According to aspects of some embodiments, the knife sharpener further comprises at least one second sharpening disk disposed in the housing.

According to aspects of some embodiments, the at least one first sharpening disk is configured for a first sharpening stage of the knife sharpener, the at least one second sharpening disk is configured for a second sharpening stage of the knife sharpener, and the at least one stropping disk is configured for a third sharpening stage of the knife sharpener.

According to aspects of some embodiments, a plurality of the knife guides is configured to position the knife blade against the at least one first sharpening disk to achieve a first edge angle of the knife blade, against the at least one second sharpening disk to achieve a second edge angle of the knife blade, and against the at least one stropping disk to achieve a third edge angle of the knife blade.

According to aspects of some embodiments, each of the at least first sharpening disk, the at least one second sharpening disk, and the at least one stropping disk is configured to achieve a different edge angle of the knife blade.

According to aspects of some embodiments, at least one of the at least one first sharpening disk, the at least one second sharpening disk, and the at least one stropping disk is configured to move laterally during a sharpening of the knife blade.

According to aspects of some embodiments, the knife sharpener further comprises at least one stop feature configured to cease a movement of the knife blade during the sharpening thereof.

Further areas of applicability will become apparent from the description provided herein. The description and specific examples in this summary are intended for purposes of illustration only and are not intended to limit the scope of the present disclosure.

BRIEF DESCRIPTION OF DRAWINGS

The drawings described herein are for illustrative purposes only of selected embodiments and not all possible implementations, and are not intended to limit the scope of the present disclosure.

FIG. 1 is a front perspective view of a knife sharpener according to an embodiment of the presently disclosed subject matter, wherein the knife sharpener includes an interchangeable knife guide cartridge;

FIG. 2 is a sectional front perspective view of the knife sharpener of FIG. 1;

FIG. 3 is an enlarged front elevational view of a portion of the knife sharpener of FIG. 1, wherein an overlay of a 15° angle knife guide and a 20° angle knife guide is shown;

FIG. 4 is a partially exploded front perspective view of the knife sharpener of FIG. 1;

FIG. 5 is a fragmentary sectional perspective view of a right side of the knife sharpener of FIG. 1;

FIG. 6 is a fragmentary sectional front perspective view of a portion of the knife sharpener of FIG. 1; and

FIG. 7 is a fragmentary elevational view of a knife blade.

DETAILED DESCRIPTION

The following description of technology is merely exemplary in nature of the subject matter, manufacture and use of one or more present disclosures, and is not intended to limit the scope, application, or uses of any specific present disclosure claimed in this application or in such other applications as may be filed claiming priority to this application, or patents issuing therefrom. Regarding methods disclosed, the order of the steps presented is exemplary in nature, and thus, the order of the steps may be different in various embodiments. “A” and “an” as used herein indicate “at least one” of the item is present; a plurality of such items may be present, when possible. Except where otherwise expressly indicated, all numerical quantities in this description are to be understood as modified by the word “about” and all geometric and spatial descriptors are to be understood as modified by the word “substantially” in describing the broadest scope of the technology. “About” when applied to numerical values indicates that the calculation or the measurement allows some slight imprecision in the value (with some approach to exactness in the value; approximately or reasonably close to the value; nearly). If, for some reason, the imprecision provided by “about” and/or “substantially” is not otherwise understood in the art with this ordinary meaning, then “about” and/or “substantially” as used herein indicates at least variations that may arise from ordinary methods of measuring or using such parameters.

All documents, including patents, patent applications, and scientific literature cited in this detailed description are incorporated herein by reference, unless otherwise expressly indicated. Where any conflict or ambiguity may exist between a document incorporated by reference and this detailed description, the present detailed description controls.

Although the open-ended term “comprising,” as a synonym of non-restrictive terms such as including, containing, or having, is used herein to describe and claim embodiments of the present technology, embodiments may alternatively be described using more limiting terms such as “consisting of” or “consisting essentially of.” Thus, for any given embodiment reciting materials, components, or process steps, the present technology also specifically includes embodiments consisting of, or consisting essentially of, such materials, components, or process steps excluding additional materials, components or processes (for consisting of) and excluding additional materials, components or processes affecting the significant properties of the embodiment (for consisting essentially of), even though such additional materials, components or processes are not explicitly recited in this application. For example, recitation of a composition or process reciting elements A, B and C specifically envisions embodiments consisting of, and consisting essentially of, A, B and C, excluding an element D that may be recited in the art, even though element D is not explicitly described as being excluded herein.

As referred to herein, all compositional percentages are by weight of the total composition, unless otherwise specified. Disclosures of ranges are, unless specified otherwise, inclusive of endpoints and include all distinct values and further divided ranges within the entire range. Thus, for example, a range of “from A to B” or “from about A to about B” is inclusive of A and of B. Disclosure of values and ranges of values for specific parameters (such as amounts, weight percentages, etc.) are not exclusive of other values and ranges of values useful herein. It is envisioned that two or more specific exemplified values for a given parameter may define endpoints for a range of values that may be claimed for the parameter. For example, if Parameter X is exemplified herein to have value A and also exemplified to have value Z, it is envisioned that Parameter X may have a range of values from about A to about Z. Similarly, it is envisioned that disclosure of two or more ranges of values for a parameter (whether such ranges are nested, overlapping or distinct) subsume all possible combination of ranges for the value that might be claimed using endpoints of the disclosed ranges. For example, if Parameter X is exemplified herein to have values in the range of 1-10, or 2-9, or 3-8, it is also envisioned that Parameter X may have other ranges of values including 1-9, 1-8, 1-3, 1-2, 2-10, 2-8, 2-3, 3-10, 3-9, and so on.

When an element or layer is referred to as being “on,” “engaged to,” “connected to,” or “coupled to” another element or layer, it may be directly on, engaged, connected or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly engaged to,” “directly connected to” or “directly coupled to” another element or layer, there may be no intervening elements or layers present. Other words used to describe the relationship between elements should be interpreted in a like fashion (e.g., “between” versus “directly between,” “adjacent” versus “directly adjacent,” etc.). As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as “first,” “second,” and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

Spatially relative terms, such as “inner,” “outer,” “beneath,” “below,” “lower,” “above,” “upper,” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. Spatially relative terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as “below” or “beneath” other elements or features would then be oriented “above” the other elements or features. Thus, the example term “below” may encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

FIGS. 1-6 illustrate an exemplary embodiment of a knife sharpener 2. The sharpener 2 shown may be designed to sharpen a knife blade 100 (depicted in FIG. 7) in one or more separate stages. In certain embodiments, the sharpener 2 may have three sharpening stages identified as Numbers 1, 2, and 3 from left to right. It is understood that more or less sharpening stages may be employed depending on various properties of the knife blade 100 intended to be sharpened. The sharpener 2 provides exceptional sharpening of a wide range of knife blades 100 that have their origins in widely different Eastern and Western cultures. An edge 102 of the knife blade 100, shown in FIG. 7, may be comprised of a number of primary edge facets 104 (one or two), which meet to form the edge 102, and an edge angle α relative to vertical (e.g., 15°). When the knife blade 100 is comprised of two primary edge facets 104, the opposing edge angles α relative to vertical, are combined to form an inclusive angle β (e.g., 30°). The edge 102 resulting from this new technology of the present disclosure is such a high quality level that direct visual examination is not effective in evaluating the quality of the final edge 102 of the knife blade 100. In fact, optical microscopes are required to visually locate any defects in the edge 102 of the knife blade 100 as they are so finely stropped. The sharpener 2 enhances a sharpness of a finished knife blade 100 in spite of established logic and experience to the contrary.

As illustrated in FIG. 1, the sharpener 2 may include a housing 3, an interchangeable knife guide cartridge 5 configured to be releaseably coupled to the housing 3, and at least one stop feature 6 (e.g., a bar) configured to serve as a rest and/or a stop to cease a movement of the knife blade 100 during a sharpening thereof. In some embodiments, the housing 3 maybe formed by a base 7 having a detachable cover 8. The housing 3 maybe configured to enclose one or more components, as described hereinafter, of the sharpener 2 in a hollow interior 4 (shown in FIG. 2). As illustrated, the base 7 may have a generally rectangular shape and include one or more feet 25 extending downwardly therefrom. In certain instances, the detachable cover 8 has a generally arched cross-sectional shape to permit the components of the sharpener 2 to be housed therein. It is understood, however, that the base 7 and the detachable cover 8 may have any shape, size, and configuration as desired. It is understood that the base 7 and the detachable cover 8 maybe produced from any suitable material as desired such as a plastic material, for example.

As best seen in FIG. 1, the stop feature 6 maybe located at a front of the housing 3 and be fixedly coupled thereto by any method as desired. In the embodiment shown, the stop feature 6 may be an elongate member disposed between the housing 3 and the cartridge 5. Preferably, the stop feature 6 may positioned immediately adjacent to and/or abut the cartridge 5. Various materials may be employed to produce the stop feature 6 including, but not limited to a plastic material, a metal material (e.g., a hardened metal material), or a combination thereof. It should be appreciated that the one or more materials used for the stop feature 6 may be sufficiently strong to provide a positive stop, yet does not damage a sharpened edge 102 of the knife blade 100.

As illustrated, the cartridge 5 includes one or more knife guides 9 configured to control the movement of the knife blade 100 during the sharpening thereof. In some embodiments, the cartridge 5 may include three knife guides 9 facilitating the three-stage sharpening of the knife blade 100. It is understood that more or less knife guides 9 maybe employed depending on a number of the sharpening stages. Each of the knife guides 9 may include one or more guide planes 10 and one or more guide springs 11. Particularly, when the sharpener 2 is configured for three-stage sharpening, the cartridge 5 may include three knife guides 9 comprised of six guide planes 10 and three guide springs 11. It is understood that when the sharpener 2 employs more or less sharpening stages, the cartridge 5 includes more or less of the guide planes 10 and the guide springs 11 as necessary. In certain embodiments, each of the knife guides 9 includes a pair of the guide planes 10 disposed on opposing sides of one of the guide springs 11. Each of the guide springs 11 may include a pair of spring arms 27 configured to hold the knife blade 100 securely against a corresponding one of the guide planes 10 as the knife blade 100 traverses and/or is pulled thru the knife guides 9. The spring arms 27 may extend along a corresponding one of the guide planes 10 to steady the knife blade 100 as it moves in a slot formed between the guide springs 11 and the corresponding guide planes 10 while being sharpened.

Each of the guide planes 10 in each of the sharpening stages is set at a carefully controlled angle χ relative to vertical. In certain embodiments, the angle χ may vary for each of the guide planes 10 in each of the knife guides 9 and/or in each of the sharpening stages to achieve the desired edge angle α (e.g., a 15° angle for Asian countries, a 20° angle for Western countries). In other embodiments, the angle χ may remain constant for each of the guide planes 10 in each of the knife guides 9 and/or successive sharpening stages. FIG. 3 is an overlay of fragmentary portions of two cartridges 5 showing exemplary guide planes 10 in each of sharpening stages 1 and 2, one of the cartridges 5 (shown in dashed lines) having the guide planes with the angle χ of 15° and another one of the cartridges 5 (shown in solid lines) having the guide planes with the angle χ of 20°, which may be used to achieve the desired edge angles of 15° and 20° of the knife blade 100, respectively.

As best seen in FIG. 4, the cartridge 5 may further include one or more guide posts 12 and one or more coupling elements 13 (e.g., snap arms) extending therefrom. The coupling elements 13 are configured to releasably couple the cartridge 5 to an attachment module 14 (shown in FIGS. 5 and 6). The attachment module 14 may be integrally formed with the housing 3 as unitary structure or formed as a separate and distinct component fixedly disposed in the hollow interior 4 of the housing 3 of the sharpener 2. The attachment module 14 may be produced from any suitable material as desired. As more clearly shown in FIG. 6, the attachment module 14 may include one or more guide pockets 15 and at least one retain/release element 16. The guide pockets 15 maybe configured to receive a corresponding guide post 12 of the cartridge 5. Similarly, the retain/release element 16 maybe configured to receive and retain at least a portion of the coupling elements 13 of the cartridge 5. For example, the retain/release element 16 may be a spring arm having a tab 17 designed to capture the coupling elements 13 and an extension 18 designed to move the tab 17 and release the coupling elements 13, which permits the cartridge 5 to be replaced. An actuator 19 for the extension 18 may be located on a rear of the housing 3. The actuator 19 may be configured to cause the tab 17 of the retain/release element 16 to move away from the coupling elements 13 and uncouple the cartridge 5 from the housing 3.

Referring back to FIG. 2, a motor assembly 20 maybe disposed within the hollow interior 4. A fan (not depicted) mounted to the housing 3 by a shroud 21 may also be disposed in the hollow interior 4 to provide cooling air flow to the motor assembly 20 and/or militate against overheating and failure. A switch 23 (shown in FIG. 5) may be provided to control a supply of electrical current to the motor assembly 20 for operation thereof.

In some embodiments, the motor assembly 20 may include a plurality of plates 22 and a pair of motor bearing assemblies 24, 26. The plates 22 may be positioned in a stack arrangement, as shown. Each of the plates 22 may be formed from any suitable material, for example, a metal material. The motor bearing assemblies 24, 26 may include respective bearings 32, 34 to support a drive shaft 36. An end of the drive shaft 36 opposite the motor assembly 20 maybe supported by and mounted onto the housing 3 by a bearing assembly (not depicted). The drive shaft 36 thus supported on one end by the bearing assembly and on the other end by the motor bearing assemblies 24, 26. In certain embodiments, the drive shaft 36 is caused to rotate at a rate of about 3000 revolutions per minute. It is understood that the drive shaft 36 maybe caused to rotate at other varying rates as desired.

One or more first sharpening disks 38, one or more second sharpening disks 39, and/or one or more stropping disks 40 may be mounted on the drive shaft 36. In some embodiments, the sharpening disks 38, 39 are configured to grind off knife material. The sharpening stage Number 1 using a pair of the first sharpening disks 38 may create a burr, which is honed off in the sharpening stage Number 2 using a pair of the second sharpening disks 39. Additionally, the stropping disks 40 may further refine the primary edge facets 104 of the knife blade 100 to a more consistent finish in the sharpening stage Number 3. While a number of different arrangements of the sharpening and the stropping disks 38, 39, 40 on the drive shaft 36 may be possible. Each of the sharpening and stropping disks 38, 39, 40 is free, however, to slide along a pin 41 provided on the drive shaft 36 as caused by a lateral pressure of the knife blade 100 as it is being sharpened. The pin 41 which is press fit into a hole 42 in the drive shaft 36 transfers a rotational torque of the drive shaft 36 to each of the sharpening and stropping disks 38, 39, 40. Accordingly, the sharpening and stropping disks 38, 39, 40 are able to move laterally along the drive shaft 36 as necessary to accommodate a thickness of the knife blade 100 while the primary edge facets 104 of the knife blade 100 are being sharpened, yet the guide springs 11 assures spring pressure is always maintained between the primary edge facet 104 of the knife blade 100 and a moving abrasive surface of the sharpening and stropping disks 38, 39, 40. Each of the sharpening and stropping disks 38, 39, 40 cooperate with the cartridge 5 to achieve the desired edge angle α (e.g., the 15° angle for Asian knife blades, a 20° angle for Western knife blades).

In certain instances, the knife guides 9 are configured to position the knife blade 100 against the at least one first sharpening disk 38 to achieve a first edge angle α of the knife blade 100, against the at least one second sharpening disk 39 to achieve a second edge angle α of the knife blade 100, and against the at least one stropping disk 40 to achieve a third edge angle α of the knife blade 100. In some embodiments, the edge angles α achieved by each of the first sharpening disk 38, the second sharpening disk 39, and/or the stropping disk 40 may be the same. In other embodiments, however, each of the first sharpening disk 38, the second sharpening disk 39, and/or the stropping disk 40 may be configured to achieve different edge angles α of the knife blade 100.

To maintain a contour of the stropping disks 40 and/or remove swarf therefrom, a dresser sled-like mechanism 42 may be employed. The mechanism 42 may be moved into contact with the stropping disks 40 along a line radius of their conical surface. The mechanism 42 may be moved laterally by a suitable device 43 such as a leveraged control arm, for example. The mechanism 42 may further include a pair of pads 44 configured to contact a surface of the stropping disks 40. The pads 44 are configured to remove any irregularities or undesired particles from the surface of the stropping disks 40. Preferably, the pads 44 may be coated with diamonds. However, other abrasives may be used on the pads 44.

In some embodiments, the sharpening disks 38, 39 may be rotatable, rigid, truncated conical disks coated with abrasives, preferably diamond of carefully selected grits. The stropping disks 40 may be truncated conical flexible disks that contain abrasive particles embedded in a flexible plastic matrix that has optimum elastomeric characteristics. It should be appreciated that each of the sharpening and stropping disks 38, 40 may be produced from any suitable material having the necessary abrasiveness, toughness, and elastomeric properties and have any shape, size, and configuration as desired to quickly remove any burr from edge 102 and simultaneously hone and polish, but not damage the edge 102 of the knife blade 100 being created.

The sharpener 2 with the appropriate sharpening disks 38, 39 provides unique means of producing an ultra-sharp edge 102 that can either: (a) retain a “bite” which can be sharpened to be an aggressive or a mild bite depending on the intended use of the knife blade 100 and/or (b) be essentially defect free and smooth with remarkable sharpness.

It is preferable to employ the multiple-stage sharpening (e.g., three stage sharpening) described herein since its remarkably fast and efficient at sharpening most knife blades 100 with only one pull through each of the slots of the knife guides 9 between the guide springs 11 and the guide planes 10 shown in FIG. 1. Alternatively, the knife blade 100 to be sharpened may be caused to traverse through the slots in any stage in order to balance and match the primary edge facets 104 being formed on each side of the edge 102. It is understood that the knife blade 100 may be caused to traverse through the knife guides 9 as many times as needed to achieve the desired sharpness of the edge 102. A critical feature of the sharpener 2 may be the capability to guide the knife blade 100 across the rotating disks 38, 40 at a proper angle. This allows the primary edge facet 104 to be made at a consistent and proper edge angle α, the most common edge angles α being 15° and 20° angles. The sharpener 2 allows the user to interchange cartridges 5 by removing an existing one of the cartridges 5 and replacing it with another one of the cartridges 5 depending on the desired edge angle α of the knife blade 100. As such, the interchangeable cartridges 5 improve an operation and a versatility of the sharpener 2, while still optimizing the sharpening of the knife blade 100.

The novel sharpener 2 with the interchangeable cartridges 5 described hereinabove sharpens the primary edge facets 104 of the edge 102 to factory standards not only for the widely differing Western and Asian and Japanese knives, but virtually all other sub-classes of knives including hunting and fishing knives, serrated knives and pocket knives, with factory quality or better edges 102.

An exemplary method for knife sharpening comprises providing the knife sharpener 2 including at least one of the sharpening disks 38, 39, the at least one stropping disk 40, and a plurality of the interchangeable knife guide cartridges 5. The cartridges 5 are configured to be releaseably coupled to the housing 3 of the knife sharpener 2. A user of the knife sharpener 2 selects one of the cartridges 5 for at least one desired edge 102 of the knife blade 100 and releaseably couples the selected one of the cartridges 5 to the housing 3. Thereafter, the knife blade 100 is sharpened using the selected one of the cartridges 5 to achieve the desired edge angles α of the knife blade 100. In some embodiments, the knife blade 100 is caused to traverse in at least one of the knife guides 9 to sharpen the knife blade 100. The stop feature 6 may serve as a rest and/or a stop to cease a movement of the knife blade 100 during the sharpening thereof.

Example embodiments are provided so that this disclosure will be thorough, and will fully convey the scope to those who are skilled in the art. Numerous specific details are set forth such as examples of specific components, devices, and methods, to provide a thorough understanding of embodiments of the present disclosure. It will be apparent to those skilled in the art that specific details need not be employed, that example embodiments may be embodied in many different forms, and that neither should be construed to limit the scope of the disclosure. In some example embodiments, well-known processes, well-known device structures, and well-known technologies are not described in detail. Equivalent changes, modifications and variations of some embodiments, materials, compositions and methods may be made within the scope of the present technology, with substantially similar results.

KNIFE SHARPENER

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