Blade having a wave profile, method for grinding such a blade, and knife having such a blade

Abstract

The present invention relates to a blade (3) having a wave profile, to a method for grinding such a blade (3), and to a knife (1) having such a blade (3). In order to enable the blade (3) to be ground using available grinding devices in a better and simpler manner than with previously known solutions, the blade (3) according to the invention comprises a cutting edge having a wave profile extending along the cutting edge, wherein the wave profile has wave trough elements (4) for forming wave troughs and wave peak elements (5) for forming wave peaks (5) protruding over the wave troughs, wherein, in cross section perpendicular to the blade body, each wave peak element (5) tapers in a wedge-like manner to the tip in order to form a linear cutting edge section (5a) at the tip, wherein the linear cutting edge sections (5a) and the adjoining cutting flanks (5b) of the wave peak elements (5) are aligned with one another such that the cutting flanks (5b) of the wave peak elements (5) can be ground in a continuous movement along the cutting edge by means of a grinding device (6), in particular a roller grinder, having a flat grinding surface.

Description

[0001] Blade with wave profile, method for grinding such a blade, and knife with such a blade

[0002] The present invention relates to a serrated blade, a method for grinding such a blade, and a knife with such a blade. Serrated knives are used, for example, in the kitchen, among other things as bread knives. The protruding sections of the serrated edge, which come into contact with a cutting board when cutting food, are subject to considerable wear.

[0003] A particular disadvantage is that a serrated / wavy-edged knife is difficult to sharpen using standard sharpening tools. This is because the wavy profile has numerous raised and recessed areas that must be individually addressed to achieve a sufficiently sharp edge. This requires complex handling and is very time-consuming.

[0004] The present invention is based on the objective of providing a blade with a wave profile, a method for grinding such a blade and a knife with such a blade, wherein the blade can be ground better and more easily with available grinding equipment than previously known solutions.

[0005] The object of the invention is solved by the subject matter of claim 1.

[0006] A blade, in particular a knife blade, preferably for a kitchen knife, is disclosed, comprising an edge with a wave profile extending along the edge, wherein the wave profile has trough elements for forming troughs and crest elements for forming crests projecting above the troughs, wherein each crest element tapers wedge-shaped in cross-section perpendicular to the blade blade to the tip in order to form a linear cutting edge section at the tip, wherein the linear cutting edge sections and the adjacent cutting flanks of the crest elements are exactly or substantially aligned with each other, so that the cutting flanks of the crest elements can be ground in a continuous grinding motion along the edge with a grinding device having a flat grinding surface, in particular a roller grinder.

[0007] This blade according to the invention combines the classic serrated profile with the profile of a smooth blade. The smooth part is formed by the serrated crests and their linear cutting edge sections, as well as the adjacent cutting flanks. This protruding part of the serrated profile typically dulls quickly with use, but the aligned design of the cutting edge sections and cutting flanks makes it easier to resharpen. A roller sharpener, such as the one known from EP 3 278 928 A1, can be used to sharpen such a blade with high reliability. Such a roller sharpener typically has a cylindrical handle with grinding / polishing surfaces on its end faces, which rotate in a vertical plane when the handle is rolled over a horizontal surface.For example, manually or with the aid of a grinding jig, as known from DE 102020 123 500 A1, such a blade can be positioned so that the cutting flanks are also aligned in a vertical plane. In this state, the end-face grinding / polishing surface can be brought into contact with the cutting flanks to roll along the cutting edge in a continuous rolling motion. The relative movement between the grinding / polishing surfaces of the roller sharpener, which rotate in a vertical plane, and the stationary cutting flanks of the wave-shaped elements removes material from the blade. This material removal from the cutting flanks sharpens the cutting edge located at the tip of the cutting flank.Due to the aligned design of the cutting edges and flanks, the grinding / polishing surfaces rotating during the rolling motion of the roller grinder can glide smoothly from cutting flank to cutting flank without any noticeable resistance in order to process all cutting flanks in one pass and thus sharpen the cutting edges.

[0008] Preferably, several or all of the linear cutting edge sections of the wave crest elements have a length in the range of 4 to 15 mm.

[0009] The troughs of the serrations lie recessed between the crests and thus retain their sharpness over time, virtually never dulling, as they typically never come into contact with a hard cutting board or surface. Therefore, to restore the sharpness of the blade's edge, it is crucial to resharpen the protruding crests, which are subject to high wear due to their exposed position.

[0010] Beneficial further training opportunities are subject to dependent claims.

[0011] It can be advantageous if the wave profile repeats periodically along the cutting edge. Particularly good cutting and grinding results can be achieved with such a wave profile.

[0012] It can be advantageous if several or all of the linear cutting edge segments of the wave crest elements lie on the same straight line. The linear cutting edge segments then form, so to speak, collinear disjoint segments of a common grinding edge of the blade. This allows for a particularly good grinding result.

[0013] It can be advantageous if several or all of the cutting flanks of the wave-like elements lie in the same plane, preferably across the entire surface. This allows the cutting flanks to be ground particularly well and easily in a continuous grinding motion without changing the working direction of the grinding tool. It can also be practical if several or all of the cutting flanks of the wave-like elements taper (when viewed from above) from the linear cutting edge section, preferably continuously, preferably linearly. Cutting flanks shaped in this way are easy to resharpen and achieve a good cutting result.

[0014] It can prove advantageous if several or all of the cutting edges of the wave crest elements (when viewed from above) have a polygonal, preferably trapezoidal or triangular outline. Cutting edges shaped in this way are particularly easy to resharpen and achieve a particularly good cutting result.

[0015] It can be advantageous if several or all of the wave trough elements have at least one arcuate cutting edge section, which preferably extends from a linear cutting edge section of an adjacent wave crest element to a linear cutting edge section of another adjacent wave crest element. This arcuate cutting edge section is well protected between the wave crest elements projecting above it and thus retains its sharpness for a long time, even with intensive use.

[0016] It can prove advantageous if several or all of the wave trough elements have at least one linear cutting edge section, preferably extending from the arcuate cutting edge section of the wave trough element to another arcuate cutting edge section of the wave trough element or to a linear cutting edge section of an adjacent wave crest element. Such linear cutting edge sections allow the distances between two wave crest elements to be selectively increased without increasing the wave depth, thus tailoring the blade to individual needs. Since these linear cutting edge sections are located in the wave troughs, they are well protected from contact with hard objects and the associated wear beneath the protruding wave trough elements.

[0017] It can be advantageous if each wave trough element has at least one arc-shaped cutting flank section, which preferably extends from a cutting flank of an adjacent wave crest element to a cutting flank of another adjacent wave crest element, wherein the arc-shaped cutting flank section is particularly preferably formed by the intersection of a cylinder or cone with the wedge shape of the blade. A blade structured in this way achieves a particularly appealing cut pattern and cutting behavior because the arc-shaped cutting flank sections can penetrate the material being cut easily and readily.

[0018] It can be advantageous if each wave trough element has at least one flat cutting flank section, which preferably extends from the arcuate cutting flank section of the wave trough element to another arcuate cutting flank section of the wave trough element or to a cutting flank of an adjacent wave crest element. With such flat cutting flank sections, the distances between two wave crest elements can also be selectively increased to tailor the blade to individual needs.

[0019] It can be advantageous if several or all wave trough elements are identically shaped and / or if several or all wave crest elements are identically shaped. Such a blade exhibits particularly uniform wear along the cutting edge.

[0020] It can prove practical if the wave profile features different types of wave crest elements, with the different types of wave crest elements preferably alternating along the cutting edge and preferably repeating periodically. Using different types of wave crest elements allows the blade to be particularly well tailored to individual needs.

[0021] It can be advantageous if each wave trough element has a wave radius in the range of 1.5 mm to 5.5 mm and / or a wave depth in the range of 1.25 mm to 4.5 mm. Such wave patterns have proven particularly practical in tests. The distance between two wave crest elements or the length of a wave trough element is preferably in the range of 2 mm to 12 mm, more preferably in the range of 4 mm to 10 mm, which, for example, corresponds to twice the wave radius in the case of a semicircular wave trough.

[0022] A further independent aspect of the present invention relates to a method for grinding a blade according to one of the preceding embodiments, wherein the blade is preferably arranged at an acute angle to a flat surface by means of a grinding guide such that the cutting flanks of the wave crest elements are aligned in a vertical plane, wherein the cutting flanks of the wave crest elements are ground in a continuous rolling motion along the cutting edge with a roller grinder, the end-face grinding surface of which rotates in a vertical plane when rolling on the flat surface. Such a roller grinder is known, for example, from EP 3278928 A1. Such a grinding guide is known, for example, from DE 102020 123 500 A1.

[0023] With this method according to the invention, it is now possible for the first time to sharpen a blade with a wave profile / serrated edge simply and reliably with available equipment and with repeatable success.

[0024] Another independent aspect of the present invention relates to a knife, in particular a kitchen knife, comprising a handle and a blade according to one of the preceding embodiments. The advantages mentioned for the blade also apply to a knife with a corresponding blade.

[0025] Further advantageous developments result from combinations of the features disclosed in the claims, the description, and the formal drawings. Terms and definitions

[0026] Escapes

[0027] The term "align" is commonly used in construction and means that during construction, various building elements such as a wall, houses or building parts are brought into a straight line so that they lie in a straight line when finished.

[0028] Within the scope of the present invention, the term "align" means that the linear cutting edge sections and the adjacent cutting flanks are brought into a straight line, either exactly or substantially so, to enable continuous grinding and / or polishing in a single pass along the cutting edge. Geometrically, these form collinearly disjoint segments or surfaces. Therefore, unlike with conventional shaft profiles, it is not necessary to change the orientation of the grinding / polishing surface or the working direction of the grinding / polishing tool for each individual shaft element when processing the shaft profile.

[0029] Minor deviations from a straight line are possible within the usual tolerance range. These deviations, for example in the form of unevenness, are removed during the grinding / polishing process. Therefore, it is only necessary that the cutting edges and flanks are essentially aligned with each other, so that continuous grinding / polishing can be carried out in one pass along the entire cutting edge using the grinding / polishing machine. The tolerance range is, for example, within + / - 3°, preferably + / - 2°, and preferably + / - 1°. This means that two sections of the same cutting edge / flank, or two adjacent cutting edges / flanks, or their tangents, form an angle of no more than 3° with each other. The sign indicates the direction of the angle, with a positive sign describing a concave angle and a negative sign describing a convex angle.

[0030] Brief description of the characters

[0031] They show:

[0032] Fig. 1 shows a computer-generated perspective view of a knife according to the invention with a blade having a wave profile, wherein the knife is a bread knife and the blade comprises an edge with a wave profile extending along the edge, wherein the wave profile has trough elements for forming troughs and crest elements for forming crests projecting above the troughs, wherein each crest element tapers in cross-section perpendicular to the blade blade in a wedge shape towards the tip in order to form a linear cutting edge section at the tip, wherein the linear cutting edge sections and the adjacent cutting flanks of the crest elements are aligned with each other, so that they can be ground in one continuous grinding motion with a grinding device having a flat grinding surface, in particular a roller grinder.

[0033] Fig. 2 shows an enlarged section of the knife blade from Fig. 1; Fig. 3 shows various exemplary wave profiles, and in particular:

[0034] Fig. 3(a) shows the wave profile of the blade from Fig. 2 in simplified representation;

[0035] Fig. 3(b) shows a wave profile similar to Fig. 3 (a), wherein the cutting flanks of the wave crest elements are triangular in shape, unlike in Fig. 3 (a), with the apex of the triangle being located at the lower end of each cutting flank;

[0036] Fig. 3(c) another wave profile, wherein the cutting flanks of the wave crest elements are trapezoidal in order to taper continuously from the linear cutting edge section, wherein the wave trough elements are formed as convex, arc-shaped surfaces without a separate cutting edge;

[0037] Fig. 3(d) a modification of the wave profile from Fig. 3 (b), wherein in the wave troughs a linear cutting edge and cutting flank section is arranged between each pair of arc-shaped cutting edge and cutting flank sections to lengthen the wave trough elements and increase the distances between the wave crest elements;

[0038] Fig. 3(e) shows a modification of the wave profiles from Fig. 3 (a) and (d), wherein the wave crest elements are widened at the tip with horn-like extensions to form overhangs projecting over the wave troughs with undercuts and to reduce the distances between the linear cutting flank sections of the wave crest elements;

[0039] Fig. 3(f) shows a modification of the wave profiles from Fig. 3 (a) and (d), wherein the wave profile has different types of wave crest elements which alternate and repeat periodically along the cutting edge, wherein the first type of wave crest element corresponds approximately to the wave crest element from Fig. 3 (a) and the second type of wave crest element corresponds approximately to the wave crest element from Fig. 3 (b).

[0040] Fig. 4 shows a schematic representation of a method according to the invention for grinding a blade, wherein the blade is arranged, for example, by means of a grinding guide (not shown), for example, according to DE 10 2020 123 500 A1, at an acute angle to or on a flat surface such that the cutting flanks of the wave crest elements are aligned in a vertical plane, wherein the cutting flanks of the wave crest elements are ground in a continuous rolling motion along the cutting edge (x-direction) with a roller grinder, for example, according to EP 3 278 928 A1, the end-face grinding surface of which rotates in a vertical plane (xz-plane) when rolling on the flat surface.

[0041] Fig. 5 shows further exemplary wave profiles, and in particular:

[0042] Fig. 5(a) shows a wave profile similar to Fig. 3(f), wherein one type of wave crest elements has rectangular cutting flanks, and the other type of wave crest elements has a linear cutting tip formed by two adjacent wave trough elements, wherein the wave troughs of the wave trough elements each have a parabolic cutting edge and cutting flank section;

[0043] Fig. 5(b) shows a wave profile similar to Fig. 5(a), wherein the wave troughs of the wave trough elements are hook-shaped and aligned with each other, in contrast to Fig. 5(a), wherein the linear cutting tip between the aligned wave trough elements is rounded and lies just below the straight line formed by the cutting edge of the rectangular wave crest elements;

[0044] Fig. 5(c) shows a wave profile similar to Fig. 5(b), wherein the rectangular wave crest elements of one type have a greater length.

[0045] Detailed description of the exemplary implementations

[0046] The preferred embodiment of the invention is described in detail below with reference to the accompanying drawings.

[0047] Fig. 1 shows a bread knife 1 with a handle 2 and a blade 3 according to the invention, having an edge that can be resharpened and has a serrated profile. The knife 1 has a total length of approximately 40 cm, of which approximately 26 cm is the blade 3.

[0048] The blade 3 comprises a cutting edge according to the invention with a periodically repeating wave profile extending along the cutting edge. The wave profile consists of a plurality of identical wave trough elements 4 for forming wave troughs and a plurality of identical wave crest elements 5 for forming wave crests 5 projecting above the wave troughs.

[0049] Each wave crest element 5 tapers in cross-section perpendicular to the blade in a wedge shape towards the tip, forming a linear cutting edge section 5a at the tip with a length L5 of approximately 5 mm measured along the cutting edge (X-direction). Wedge-shaped means that the cutting flank 5b forms an acute angle of approximately 15° or less with a plane of the blade, as shown in Fig. 4. As illustrated in Fig. 2, the linear cutting edge sections 5a lie on the same straight line G. Furthermore, all cutting flanks 5b of the wave crest elements 5 adjacent to the linear cutting edge sections 5a lie entirely in the same plane.

[0050] In the top view according to Fig. 2, all cutting flanks 5b of the wave crest elements 5 have a trapezoidal outline and taper linearly downwards from the linear cutting edge section 5a. This allows the cutting flanks 5b of the wave crest elements 5 to be ground with a grinding tool having a flat grinding surface, such as a roller grinder 6, in such a way that the flat grinding surface simultaneously has full-surface contact with several cutting flanks 5b. The grinding tool 6 can be moved along the cutting edge without changing the working direction in order to process all cutting flanks 5b of the wave crest elements 5 in a single, continuous movement, if necessary, reciprocally and repeatedly.

[0051] The wave trough elements 4 comprise an arc-shaped and approximately semicircular cutting edge section 4a, which extends from a linear cutting edge section 5a of an adjacent wave crest element 5 to a linear cutting edge section 5a of another adjacent wave crest element 5. The arc-shaped cutting flank section 4b adjacent to the arc-shaped cutting edge section 5a is formed, for example, by the intersection of a cone with the wedge shape of the blade 3, which is visible in Fig. 4. The arc length of the cutting flank section 4b is shortest at the arc-shaped cutting edge section 4a and increases downwards with increasing distance from the arc-shaped cutting edge section 4a. Each wave trough element 4 has, for example, a wave radius R4 in the range of 1.5 mm to 5.5 mm and a wave depth in the range of 1.25–4.5 mm.The distance between two wave crest elements 5 along the cutting edge corresponds in this case to twice the wave radius R4, i.e., 2*R4. The total length of the periodically repeating wave profile is therefore L5 + 2*R4.

[0052] There are various design options for the contour of the wave. The previously described concept of the wave profile of the blade 3 according to the invention can be modified in various ways, as described below by way of example with reference to Figure 3. The same reference numerals are used for essentially identical or functionally equivalent elements. Reference is made to the preceding explanations, omitting a separate description.

[0053] Fig. 3(a) shows the wave profile of the blade 3 from Fig. 2 in a simplified representation.

[0054] In the wave profile shown in Fig. 3(b), the cutting edge 5b of each wave crest element 5 differs from Fig. 3(a) in that it is triangular instead of trapezoidal. The apex of the triangle is located at the lower end of each cutting edge 5b. This wave profile allows the distances between the wave crest elements 5 to be reduced without significantly altering the cutting or grinding behavior of the blade 3.

[0055] In the wave profile shown in Fig. 3(c), the cutting flanks 5b of the wave crest elements 5 are trapezoidal, tapering continuously but non-linearly downwards from the linear cutting edge section 5a at the apex. The wave trough elements 4 are formed as convex, arc-shaped surfaces without a separate cutting edge. This shape of the wave trough elements 4 results from the intersection of a cylinder, e.g., a cylindrical drill bit, with the wedge shape of the blade, e.g., visible in Fig. 4. By removing material from the blade 3 to form the wave trough elements 4, the shape of the wave crest elements 5 shown is obtained.

[0056] The wave profile shown in Fig. 3(d) is a modification of the wave profile from Fig. 3(b). The special feature of this wave profile is that in each wave trough 4, a linear cutting edge and cutting flank section is arranged between two arc-shaped cutting edge and cutting flank sections adjacent to the wave crest elements 5. These linear design elements make it possible to lengthen the wave trough elements 4 as desired and to increase the distances between the wave crest elements 5 without increasing the wave depth.

[0057] Figure 3(e) shows a further modification of the wave profiles from Figures 3(a) and (d). In this embodiment, the wave crest elements 5 are widened at the tip to form overhangs or "horns" with undercuts projecting over the wave troughs 4 and to reduce the distances between the wave crest elements 5. With such a wave profile, which approximates a sawtooth profile, the tearing or sawing function of the blade can be enhanced, similar to a saw blade.

[0058] The wave profile shown in Fig. 3(f) is a modification of the wave profiles from Figs. 3(a) and (d), wherein the wave profile has different types of wave crest elements 5 which alternate and repeat periodically along the cutting edge. The first type of wave crest element 5 corresponds approximately to the wave crest element from Fig. 2 or 3(a). The second type of wave crest element 5 corresponds approximately to the wave crest element in view (b). The different types of wave crest elements 5 can fulfill different functions. For example, the first type of wave crest element 5 can have a tearing function, and the second type of wave crest element 5 a smoothing or aligning function, so that a particularly smooth cut surface results on material cut with the blade 3.

[0059] A method according to the invention for grinding a serrated blade according to the invention is described in detail below with reference to Fig. 4:

[0060] First, the previously described blade 3 is positioned at an acute angle on a flat surface U using a grinding guide, such as that known from DE 102020 123500 A1, such that the cutting edge deflects from the flat surface U and the cutting flanks 5b of the wave crest elements 5 are aligned in a vertical plane (XZ plane). Subsequently, the cutting flanks 5b of the wave crest elements 5 are brought into contact with a roller grinder 6, which has a flat end-face grinding surface. For this purpose, the roller grinder 6 is arranged, as shown in Fig. 4, such that the end-face grinding surface of the grinder 6 simultaneously has planar contact with the multiple cutting flanks 5b. The end face grinding surface of a roller grinder 6 has a diameter of approximately 50 mm and, when used as intended, is in contact with approximately five cutting flanks 5b of different wave crest sections 5 of the blade 3 at the same time.The greater the number and area of ​​the cutting flanks 5b in contact with the grinding surface, the more evenly the contact pressure of the roller sharpener 6 is distributed over the blade 3 and the lower the surface pressure acting on each cutting flank 5b.

[0061] Since the end-face grinding surface of the grinding tool 6 rotates in a vertical plane (XZ plane) when the roller grinder 6 rolls on the flat surface U, all cutting flanks 5b can be processed and ground in one pass along the cutting edge without changing the working direction. Because the cutting edges 5a and cutting flanks 5b are aligned with each other, the roller grinder 6 can be moved back and forth several times along the entire cutting edge in a smooth and controlled motion without having to jump between the individual cutting edges 5a and cutting flanks 5b or change the rolling direction.The grinding effect results from the fact that the grinding surface of the roller grinder 6, which rotates in a vertical plane, is in contact with the cutting flanks 5b over a surface area, in order to remove thin layers of material from these cutting flanks 5b by means of the relative movement between the grinding surface and the cutting flank 5b with the abrasive coating, and thus to sharpen the linear cutting edge section 5a located at the tip of the cutting flanks 5b.

[0062] The wave profile concept of the blade 3 according to the invention, as described above, can be modified in further ways, as is described below by way of example with reference to Figure 5. The same reference numerals as in Figure 3 are used for essentially identical or functionally equivalent elements. Reference is made to the preceding explanations, omitting a separate description.

[0063] Figure 5(a), like Figure 3(f), shows a wave profile with different types of wave crest elements 5, which alternate and repeat periodically along the cutting edge. A cutting edge 5b1 of the first type of wave crest element 5 is rectangular, and a cutting edge 5b2 of the second type of wave crest element 5 is linear. Between each of the two types of wave crest elements 5, wave trough elements 4 with parabolic cutting edges 4a1 and parabolic cutting edges 4b1 are arranged. The cutting edge 5a2 and the cutting edge 5b2 of the second type of wave crest element 5 are formed by the two tapered cutting edges 4b1. The different types of wave crest elements 5 can fulfill different functions. In comparison to the blade 3 from Fig. 3(f), the tapered cutting edges 5a2 and cutting flanks 5b2 of the second type can prevent the tearing orThe sawing function of blade 3 is further enhanced, while the cutting edge 5a1 and the cutting flank 5b1 of the first type, for example, continue to have a smoothing or aligning function. The parabolic shape of the cutting edges 4a1 and cutting flanks 4b1 ensures a uniform deflection of the removed material and controlled chip compaction.

[0064] The blade 3 shown in Fig. 5(b) differs from the blade 3 in Fig. 5(a) in the shape of the wave trough elements 4 and in the rounded cutting edges 5a2 and cutting flanks 5b2. The wave trough elements 4 comprise two different types, which have a hook shape and are arranged axially symmetrically along the cutting edge with respect to an intervening wave crest element 5. In contrast to the wave trough elements 4 in Fig. 5(a), the cutting edges 4a1, 4a2 and cutting flanks 4b1, 4b2 have an asymmetrical, freely shaped curve with variable curvature. The cutting edges 4a1, 4a2 and cutting flanks 4b1, 4b2 exhibit a greater curvature in the direction of a cutting edge 5a2 or cutting flank 5b2 located between the wave trough elements 4. The intermediate cutting edges 5a2 and 5a2 respectively.The cutting flanks 5b2 are rounded and lie slightly (at a distance approximately corresponding to the radius of curvature) below the straight line formed by the cutting edge 5a1 of the rectangular wave crest elements 5. A blade 3 shaped in this way ensures a precisely modulated cutting geometry with a differentiated chip formation process. The removed material is progressively deflected and carried away towards the respective valley floor. The axial symmetry of both wave trough elements 4 results in the lateral force components largely canceling each other out. The lowered cutting edge 5a2 means that it only becomes involved in the cutting process with increasing penetration depth. This reduces the load on the entire cutting edge and allows for progressive contact. The lowered and rounded tip also contributes to chip splitting. The resulting chip can be directed into two partial flows, each of which can flow into the adjacent valleys.The concave, tapered geometry of the valleys promotes the lifting and curling of the chips. This can lead to improved chip breakage and thus to shorter chips, which facilitate easier removal.

[0065] The blade 3 shown in Fig. 5(c) differs from the blade 3 in Fig. 5(b) only in the length of the rectangular wave crest elements 5. The length of the rectangular wave crest elements 5 can be freely designed. The length of the cutting edge 5a1 and the cutting flank 5b1 has a significant influence on the penetration behavior and the load distribution along the blade 3. The degree of smooth cutting behavior compared to the tearing or sawing function of the blade 3 is directly related to the length of the cutting edge 5a1 and the cutting flank 5b1.

[0066] The blade 3 according to the invention is particularly intended for and configurable for the following types of knives:

[0067] • Bread knife (& pastry knife) - Blade length: approx. 20-28 cm - Serrated edge: large • Slicing & utility knife - Blade length: approx. 10-13 cm - Serrated edge: medium • Vegetable & table knife (snack knife) - Blade length: approx. 9 cm - Serrated edge: small • Steak knife - Blade length: approx. 9-10 cm - Serrated edge: small

[0068] • Cutlery knife & utility knife (with serrated edge) - Blade length: approx. 6 cm - Serration: very small (micro-serrated)

[0069] In summary, the invention offers the following advantages.

[0070] This blade according to the invention combines the classic serrated profile with the profile of a smooth blade. The smooth part, formed by the serrations, typically dulls quickly with use but can be resharpened using a roller sharpener. The troughs of the serrations lie recessed between the serrations and thus retain their sharpness permanently, virtually never dulling, as they generally never come into contact with a hard cutting board or surface. Therefore, to restore the sharpness of the blade's edge, it is crucial to resharpen the protruding serrations, which are subject to high wear due to their exposed position.

[0071] Resharpening the blade is done exactly the same way as sharpening a smooth blade. However, only the cutting edges of the serrated elements are resharpened, which is possible because all these cutting edges are exactly, or at least essentially, aligned with each other or lie in the same plane.

[0072] The illustrated embodiments are to be understood as merely exemplary. Various modifications are possible within the scope of the attached claims. Reference numeral list

[0073] 1 knife

[0074] 2 handles

[0075] 3 blades

[0076] 4 First wave element (wave trough) 4a Cutting edge

[0077] 4b Cutting edge

[0078] 5 Second wave element (wave crest) 5a Cutting edge

[0079] 5b Cutting edge

[0080] L5 Length of the cutting edge

[0081] R4 shaft radius

Claims

Claims 1. Blade (3), in particular a knife blade, preferably for a kitchen knife (1), comprising an edge with a wave profile extending along the edge, wherein the wave profile has trough elements (4) for forming troughs and crest elements (5) for forming crests (5) projecting above the troughs, wherein each crest element (5) tapers in cross-section perpendicular to the blade blade in a wedge shape towards the tip in order to form a linear cutting edge section (5a) at the tip, wherein the linear cutting edge sections (5a) and the adjacent cutting flanks (5b) of the crest elements (5) are aligned with each other, so that the cutting flanks (5b) of the crest elements (5) can be ground in a continuous movement along the edge with a grinding device (6) having a flat grinding surface, in particular a roller sharpener.

2. Blade (3) according to the preceding claim, characterized in that the wave profile is periodically repeated along the cutting edge.

3. Blade (3) according to one of the preceding claims, characterized in that several or all of the linear cutting edge sections (5a) of the wave crest elements (5) lie on the same straight line (G).

4. Blade (3) according to one of the preceding claims, characterized in that several or all of the cutting flanks (5b) of the wave crest elements (5) lie in the same plane, preferably over the entire surface.

5. Blade (3) according to one of the preceding claims, characterized in that several or all of the cutting flanks (5b) of the wave crest elements (5) taper starting from the linear cutting edge section (5a), preferably continuously, preferably linearly.

6. Blade (3) according to one of the preceding claims, characterized in that several or all of the cutting flanks (5b) of the wave crest elements (5) have a polygonal, preferably trapezoidal or triangular outline.

7. Blade (3) according to one of the preceding claims, characterized in that several or all of the wave trough elements (4) have at least one arc-shaped cutting edge section (4a) which preferably extends from a linear cutting edge section (5a) of an adjacent wave crest element (5) preferably to a linear cutting edge section (5a) of another adjacent wave crest element (5).

8. Blade (3) according to the preceding claim, characterized in that several or all of the wave trough elements (4) have at least one linear cutting edge section which preferably extends from the arcuate cutting edge section (4a) of the wave trough element (5) preferably to another arcuate cutting edge section of the wave trough element (4) or to a linear cutting edge section (5a) of an adjacent wave crest element (5). 9.Blade (3) according to one of the preceding claims, characterized in that each wave trough element (4) has at least one arcuate cutting flank section (4b) which preferably extends from a cutting flank (5b) of an adjacent wave crest element (5) preferably to a cutting flank (5b) of another adjacent wave crest element (5), wherein the arcuate cutting flank section (4b) is particularly preferably formed by intersecting a cylinder or cone with the wedge shape of the blade (3).

10. Blade (3) according to the preceding claim, characterized in that each wave trough element (4) has at least one flat cutting flank section which preferably extends from the arcuate cutting flank section (4b) of the wave trough element to another arcuate cutting flank section (4b) of the wave trough element (4) or to a cutting flank (5b) of an adjacent wave crest element (5).

11. Blade (3) according to one of the preceding claims, characterized in that several or all wave trough elements (4) are identically designed and / or that several or all wave crest elements (5) are identically designed.

12. Blade (3) according to one of the preceding claims, characterized in that the wave profile has different types of wave crest elements (5), wherein the different types of wave crest elements (5) preferably alternate along the cutting edge and preferably repeat periodically.

13. Blade (3) according to one of the preceding claims, characterized in that each wave trough element (4) has a wave radius in the range of 1.5mm to 5.5mm and / or a wave depth in the range of 1.25mm to 4.5mm.

14. Method for grinding a blade (3) according to one of the preceding claims, wherein the blade (3) is preferably arranged at an acute angle to a flat surface (U) by means of a grinding guide, such that the cutting flanks (5b) of the wave crest elements (5) are aligned in a vertical plane, wherein the cutting flanks (5b) of the wave crest elements (5) are ground in a continuous rolling motion along the cutting edge with a roller grinder (6), the end face grinding surface of which rotates in a vertical plane when rolling on the flat surface (U).

15. Knife (1), in particular kitchen knife, comprising a handle (2) and a blade (3) according to one of the preceding claims.

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