EP4021691A1

EP4021691A1 - Blade, in particular knife blade

Info

Publication number: EP4021691A1
Application number: EP20761211.0A
Authority: EP
Inventors: Djordje Martic
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-27
Filing date: 2020-08-21
Publication date: 2022-07-06
Also published as: WO2021037731A1; DE202019003530U1

Abstract

Blade, in particular knife blade (1), having two blade sides (2, 3), a blade spine (4) and a blade cutting edge (5). The blade or knife blade is in the form of a corrugated blade. Arranged on both blade sides, along at least 60% of the length of the blade, are a multiplicity of waves (6) having wave peaks (7) and wave troughs (8). The waves extend transversely, in particular perpendicularly, to the longitudinal direction of the blade and/or in the form of a circle segment along at least 80% of the height of the blade. The blade is sharpened on one or both sides at least at the blade edge in such a way as to result in a cut angle a of 5° to 60°.

Description

Blade, in particular knife blade

Description:

The invention relates to a blade, in particular a knife blade, the blade having two blade sides, a blade back and a blade edge.

Blades or knife blades of the type described above are known in principle in different embodiments from practice. It is also known that the blades or knife blades are provided with a serrated edge on their blade edge so that they have saw teeth. Such a serrated edge has proven itself, for example, for cutting hard-crusted or hard-skinned foods. However, the known blades or knife blades with a serrated edge are distinguished by the disadvantage that the re-sharpening of the blade edge is only possible with great effort and that in most cases the original sharpness of the blade cannot be achieved again by re-sharpening. In addition, it has been shown in the case of the blades or knife blades known from practice that the material to be cut often sticks to the blade and therefore a clean cut through the material to be cut is not possible. - In this respect there is a need for improvement.

In contrast, the invention is based on the technical problem of specifying a blade, in particular a knife blade, of the type mentioned at the outset, the blade edge of which can be re-sharpened with little effort and in which the material to be cut can be prevented from sticking during the cutting process.

To solve the technical problem, the invention teaches a blade, in particular a knife blade, wherein the blade has two blade sides, a blade back and a blade edge and is designed as a wave blade, wherein on both blade sides over at least 60% of the length of the blade, preferably over at least 80%, preferably over at least 95%, particularly preferably over the entire length of the blade or essentially over the entire length of the blade, a plurality of waves with wave crests and Wave troughs is arranged, wherein the waves are transverse, in particular perpendicular, to the longitudinal direction of the blade and / or part-circular along at least 80% of the height of the blade, preferably along at least 90%, preferably along at least 95%, particularly preferably along the entire height of the blade or extend essentially along the entire height of the blade and wherein the blade is ground on one or both sides at least on the blade edge such that a grinding angle of 5 ° to 60 °, preferably from 10 ° to 50 °, preferably from 15 ° to 40 ° and particularly preferably from 25 ° to 30 °.

In the context of the invention, the back of the blade means in particular the side of the blade opposite the blade edge. In the context of the invention, the term blade cutting edge means in particular that side of the blade which faces the material to be cut during the cutting process and which is opposite the back of the blade. The cutting edge of the blade is preferably the sharpened area of the blade which is or will be provided with a bevel or an additional bevel and thus expediently forms the sharpened part of the blade. The ground part of the blade or the sharpened blade edge is also referred to as the bevel of the blade. In the context of the invention, the length Ki of the blade means in particular the greatest extent of the blade in the longitudinal direction of the blade, the part of the blade intended for holding, which is referred to as the handle, does not count towards the length Ki of the blade. In this context, the longitudinal direction I of the blade means in particular the direction which extends along the longitudinal axis of the blade. In the context of the invention, height K _{h of} the blade means in particular the greatest extent of the blade transversely, in particular perpendicular to its longitudinal direction or longitudinal axis, that is to say expediently from the blade edge or from the cutting edge to the back of the blade.

It is preferred that the blade according to the invention is a knife blade. In principle, however, the blade can also be a blade of a bread slicer, scissors, an ax, a lawn mower or the like. According to the invention, the blade or knife blade is designed as a corrugated blade in which a large number of corrugations are arranged on both blade sides, the corrugations having wave crests and wave troughs. The corrugations are preferably arranged over the entire length of the blade or essentially over the entire length of the blade and particularly preferably extend along the entire height of the blade or essentially along the entire height of the blade. According to the invention, the waves or the individual waves extend transversely, in particular perpendicular to the longitudinal direction of the blade along at least 80% of the height of the blade, preferably along the entire height of the blade and / or part-circularly along at least 80% of the height of the blade, preferably along the entire height of the blade. Partially circular in this context means in particular that the waves or the individual waves each extend from the cutting edge or from the blade edge in the direction of the back of the blade - preferably along the entire height of the blade - along a partial circle or arc.

According to the invention, the blade is ground at least on the blade edge on one or both sides in such a way that a grinding angle a of 5 ° to 60 °, preferably from 15 ° to 40 °, particularly preferably from 25 ° to 30 °. In the context of the invention, the grinding angle a means in particular the angle formed by the two surfaces of the blade edge. If the blade or blade edge is ground on one side, the grinding angle thus means the angle formed by the ground side or surface of the blade edge and by the unpolished side or surface of the blade edge. The grinding angle is then expediently formed by the ground side or surface of the blade edge ground on one side and by the opposite, ungrounded blade side. If the blade or the blade edge is ground on both sides, the grinding angle means the angle formed by the two ground sides or surfaces of the blade edge. In this context, it is within the scope of the invention that when the blade or the blade edge is ground on both sides, the two ground sides or surfaces of the blade edge have the same partial grinding angle in relation to the middle width of the blade and thus contribute equally to the grinding angle so that the blade or blade edge is ground symmetrically. In the context of the invention, the middle of the width means in particular the plane running centrally through the blade in relation to the blade width from the back of the blade to the blade edge or to the cutting edge. The blade is preferably only sharpened at the blade edge and particularly preferably the area of the blade that is ground for this purpose forms the blade edge.

According to a particularly preferred embodiment of the blade according to the invention, the cut of the blade edge is straight on one side or on both sides. With such a straight cut, the sharpened blade edge or the flat extension of the ground surfaces or the ground surface of the sharpened blade edge is oriented in particular straight and flat in the longitudinal direction of the blade. The ground surfaces resp. the ground surface of the blade edge therefore expediently does not follow the individual waves in its flat extension when the blade edge has just been ground. Incidentally, within the scope of the invention, cutting edge means in particular the edge of the blade which closes off the blade cutting edge at the bottom and which is in direct contact with the material to be cut during the cutting process.

The blade according to the invention is based on the knowledge that the large number of corrugations, which preferably extend along the entire height of the blade or essentially along the entire height of the blade, makes re-sharpening of the blade surprisingly easy and functionally reliable, as well as possible sticking of material to be cut to the blade or can be avoided very easily and reliably.

A particularly preferred embodiment of the blade according to the invention is characterized in that the blade _{tapers in terms of its width K b} from the blade back to the blade edge. The blade preferably tapers conically in terms of its width K _b from the blade back to the blade edge. According to a further preferred embodiment, the blade is provided with a hollow grind on one or both sides from the blade back to the blade edge. In this context, hollow ground means in particular that the blade _{tapers in terms of its width K b} from the back of the blade to the blade edge and is concave on one or both sides. It is therefore preferred that the blade _{tapers in terms of its width K b} from the blade back to the blade edge and preferably tapers conically and / or concavely. Blade width K _b means in the context of the invention in particular the width of the blade transversely, in particular perpendicular to the longitudinal direction or longitudinal axis of the blade and transversely, in particular perpendicular to the height extension of the blade. When the blade tapers in width from the blade back to the blade edge, the width of the blade is greatest at the blade back and decreases towards the blade edge. This tapering of the blade expediently extends over at least 70% of the length of the blade, preferably over at least 80% of the length of the blade, preferably over at least 90% of the length of the blade and very particularly preferably over the entire length of the blade or essentially over the entire length of the blade. The tapering of the blade preferably extends continuously from the back of the blade to the blade edge and thus over at least 90% of the height of the blade, preferably over at least 95% of the height of the blade. In principle, it is also possible for a section without tapering in the direction of the blade edge to be arranged next to the back of the blade and for the blade to taper towards the blade edge following this section.

In the preferred embodiment, in which the blade tapers in terms of its width from the blade back to the blade edge and in particular tapers conically and / or concave, the blade thus has a first primary bevel which extends from the blade back to the blade edge. The sharpened or ground blade edge then forms a second secondary bevel that extends to the cutting edge.

It is within the scope of the invention that the blade is designed in one piece and in particular consists or essentially consists of at least one steel and / or at least one ceramic. These materials have proven particularly useful for the blade according to the invention.

According to a particularly preferred embodiment of the invention, the waves arranged on the two blade sides run parallel to one another in such a way that a wave crest on one side of the blade corresponds to a wave trough on the other side of the blade.

It is preferred that the waves each have an identical or essentially identical wave height W _h . Wave height W _h means in the context of the invention in particular the height of a wave from its wave trough to its wave crest, i.e. the height at which a wave extends from wave trough to wave crest transversely, in particular perpendicular to the flat extension of the respective blade side. The wave height thus expediently corresponds to twice the wave amplitude.

According to a particularly preferred embodiment of the blade or knife blade according to the invention, the wave height is less than or equal to the smallest width of the blade in the unsanded state. In the context of the invention, the unpolished state of the blade means in particular the state in which the blade has not yet been ground on one side or on both sides at a bevel angle, so that there is still no ground blade edge. In this state there is basically a blade edge or a cutting edge on the side of the blade opposite the back of the blade, but this area of the blade is not ground. The smallest width Sb of the blade in the uncut state is then expediently the width on the underside or cutting edge of the uncut blade.

The smallest width of the blade in the unpolished state can also be determined within the scope of the invention when the blade is ground. If the blade has a constant width in terms of its width from the blade back to the blade edge, the smallest width of the blade corresponds to unsanded state of this constant width. If, according to a preferred embodiment of the invention, the width of the blade tapers from the blade back to the blade edge and, in particular, tapers conically, the smallest width of the blade edge in the unpolished state can also be determined geometrically in the ground state by the two converging blade sides or their Surfaces, i.e. the primary bevel, are imaginary extended in the direction of the cutting edge, and are drawn to the lower end of the blade edge or the secondary bevel and at this point or on the cutting edge, the original width of the blade in the unpolished state is derived from the distance of the imaginary extensions of the blade sides determined.

A particularly preferred embodiment of the blade according to the invention is characterized in that the wave troughs do not intersect the middle of the width of the blade. In this context, the center of width means in particular the plane running centrally through the blade in relation to the blade width from the back of the blade to the blade edge or to the cutting edge. If the blade is ground on both sides, in particular straight on both sides, in the area of the blade edge, the resulting cutting edge is part of the plane forming the center of the width. If the blade is ground on one side, in particular straight on one side, in the area of the blade cutting edge, the resulting cutting edge is arranged offset to the plane forming the center of the width. The fact that the wave troughs do not intersect the middle of the width of the blade means in particular that the deepest point of a trough does not intersect the middle of the width of the blade or does not intersect the plane forming the middle of the width. Thus, with regard to their wave height, the waves expediently do not overlap the middle width of the blade.

If, according to a preferred embodiment, the wave troughs do not intersect the middle of the width of the blade, a one-sided, in particular one-sided straight, cut of the blade edge results in particular a blade with a bevel that is serrated or designed as a zigzag wave bevel. If, according to a preferred embodiment, the wave troughs do not intersect the middle of the width of the blade, a blade edge with a double-sided bevel, which is mutually jagged or which has an alternating zig-zag shape, results in a double-sided, in particular straight, blade grinding, expediently, so that the two Chamfers consist of triangles or claws arranged directly next to one another.

According to a further recommended embodiment of the blade or knife blade according to the invention, the wave height is greater than the smallest width of the blade in the unpolished state. In particular, the wave height corresponds to between 1.1 and 3.0 times, preferably between 1.2 and 2.5 times, particularly preferably between 1.3 and 2.3 times and very particularly preferably between 1.5 and 2.0 times that smallest width of the blade when not sharpened.

If the wave height according to a preferred embodiment of the invention is greater than the smallest width of the blade in the unpolished state, the wave troughs expediently cut across the middle of the width of the blade, at least in some areas. The fact that the wave troughs at least partially overlap the width center of the blade means in the context of the invention in particular that at least the deepest point of a wave trough is arranged on the other side of the plane forming the width center than the wave crests associated with the wave trough. If the blade is as recommended Embodiment tapered in terms of its width from the blade back to the blade cutting edge and in particular tapers conically and / or concave, it is within the scope of the invention that the wave troughs intersect the middle of the width of the blade at least along part of the height of the blade and in particular at least in the Blade edge associated part of the height of the blade intersect the middle of the width of the blade. According to a preferred embodiment, the wave troughs intersect the center of the width of the blade only along part of the height of the blade, preferably in a part of the height of the blade assigned to the blade edge.

In the context of the embodiment in which the wave troughs intersect the middle of the width of the blade, if the blade or the blade edge is ground on one side, in particular straight on one side, a bevel of the blade edge which is jagged or which is designed as zigzag waves is expediently the result Bevel is formed. If, according to a recommended embodiment, the wave troughs intersect the middle of the width of the blade and the blade or the blade edge is ground on both sides, in particular straight on both sides, the result is a bevel of offset triangles or semicircles that are jagged in the area of the wave troughs that intersect the middle of the width of the blade are trained.

A particularly proven embodiment of the invention is characterized in that the smallest width of the blade in the unsanded state is less than or equal to 0.5 mm, in particular less than or equal to 0.3 mm and preferably between 0.025 and 0.3 mm, preferably between 0 .05 and 0.3 mm, particularly preferably between 0.1 and 0.3 mm. The wave height is expediently a maximum of 0.5 mm, preferably a maximum of 0.3 mm. The wave height is preferably between 0.05 and 0.3 mm, particularly preferably between 0.1 and 0.3 mm. According to an alternative embodiment, the wave height is max. 1.5 mm, preferably max. 1.0 mm, preferably max. 0.6 mm. In the context of this alternative embodiment, the wave height is particularly preferably between 0.05 and 0.6 mm, very particularly preferably between 0.1 and 0.6 mm.

It is within the scope of the invention that the greatest width R _{b of} the blade back is less than or equal to 7.0 mm, in particular less than or equal to 5.0 mm and preferably between 0.1 and 5.0 mm, preferably between 0.5 and 5.0 mm, particularly preferably between 1.0 and 5.0 mm. Width R _{b of} the blade back means in this context in particular the greatest extent of the blade back transversely, in particular perpendicular to the longitudinal direction or longitudinal axis of the blade, and transversely, in particular perpendicular to the height extent of the blade.

According to a particularly preferred embodiment of the invention, the cutting edge of the blade or the blade edge is straight and / or serrated in the ground state. If the cutting edge of the blade edge is straight in the ground state, this means in particular that the cutting edge runs along a straight, uninterrupted line. If the cutting edge of the blade edge is serrated in the ground state, this means in particular that the cutting edge runs along a serrated line. Preferably there is a straight, uninterrupted cutting edge of the blade edge in the ground state when the wave troughs do not intersect the middle of the width of the blade according to the preferred embodiment and when the blade is ground on both sides, in particular straight on both sides. A cutting edge of the blade edge which is straight in some areas and interrupted by serrations is preferably obtained when the wave troughs intersect the middle of the width of the blade according to the preferred embodiment at least in areas and when the blade is ground on both sides, in particular straight on both sides. A serrated cutting edge of the blade edge in the ground state is preferably obtained when the wave troughs do not overlap or intersect the width center of the blade according to the preferred embodiment variant and when the blade edge is ground on one side, in particular straight on one side.

A highly recommended embodiment of the invention is characterized in that the length of the waves WL is greater than the greatest width of the blade back and / or greater than the smallest width of the blade in the unpolished state. In the context of the invention, length of the waves WL means in particular the greatest extent of a wave in the longitudinal direction of the blade, that is to say the greatest distance between two wave troughs or between two wave crests in the longitudinal direction of the blade. In this context, it is preferred that the waves each have an identical or essentially identical wavelength. It is possible that the waves have different wavelengths. In the context of such an embodiment, it is preferred that the wavelength increases from the front end of the blade to the end assigned to the handle of the blade.

It is recommended that the back of the blade extends over at least 50%, preferably over at least 60%, preferably over at least 70% of the length of the blade parallel or essentially parallel to the blade edge and / or to the cutting edge of the blade. The back of the blade preferably runs in an arc shape in a front section of the blade, in particular in the shape of a circular arc, towards the end of the blade edge. In principle, it is also possible for the blade edge to run in a curved manner in a front section of the blade, in particular in a circular arc, towards the end of the back of the blade. It lies within the scope of the invention that the wave crests taper to a point or essentially point at least on at least one blade side and / or that the wave troughs taper to a point or essentially point to at least one side of the blade. The wave crests preferably taper to a point or essentially to a point on both blade sides and the wave troughs particularly preferably to taper to a point or essentially to a point on both blade sides. According to an alternative embodiment, the wave crests are round on at least one blade side and / or the wave troughs are round on at least one blade side. It is also possible for the wave crests to taper to a point or essentially to a point on one side of the blade and to have a round shape on the other side of the blade, with the wave troughs preferably tapering to a point on one side of the blade and being round on the other side of the blade in the context of such an embodiment.

To solve the technical problem, the invention also teaches a cutting tool, in particular a knife, the knife having at least one handle and at least one blade, preferably a blade or knife blade described above.

The invention is based on the knowledge that the blade or knife blade according to the invention can be re-sharpened in a simple and functionally reliable manner. The inventive design of the blade as a corrugated blade with corrugations, which according to a preferred embodiment extend along the entire height of the blade, on the one hand, a little time-consuming re-sharpening of the blade while maintaining the intended blade structure or cutting edge shape and, on the other hand, almost no material to be cut remains during the cutting process stick to the blade, as gaps between the material to be cut and the blade surfaces are created by the waves and onto them Way, the contact surface between the material to be cut and the blade is therefore essentially limited to the corrugation peaks. In addition, both the blade, which preferably tapers in terms of its width from the blade back to the blade cutting edge, which tapers in particular conically, as well as the waves, achieve a wedge effect during the cutting process, so that the material to be cut is pushed apart. The cutting process can thus be carried out with the blade according to the invention in an advantageous manner with a particularly low expenditure of force and adhesions on the sides of the blade can be almost completely avoided. In addition, the blade according to the invention is characterized by its simplicity and, to that extent, also by its relatively low production costs.

The invention is explained in more detail below with the aid of a drawing showing only one exemplary embodiment. It shows in a schematic representation:

1: a perspective view of a knife according to the invention with a blade or knife blade according to the invention,

Fig. 2: a plan view of a blade according to the invention in the unge ground state in a first embodiment,

Fig. 2a: a section through the object according to Fig. 2 along the axis C-C,

3: a side view of the blade according to FIG. 2 in the state ground on both sides,

Fig. 3a: a section through the object according to Fig. 3 along the axis A-A,

Fig. 3b: the determination of the smallest width of the cutting edge in the unground state using the example of Fig. 3a,

4: a side view of the blade according to FIG. 2 in the state ground on one side, FIG. 4a: a section through the object according to FIG. 4 along the axis B-B,

5: a blade according to the invention in the unpolished state in a second embodiment,

Fig. 5a: a section through the object according to Fig. 5 along the axis D-D,

6: a side view of the blade according to FIG. 5 in the state ground on both sides,

6a: a section through the object according to FIG. 6 along the axis E-E, FIG. 7: a side view of the blade according to FIG. 5 in the state ground on one side,

7a: a section through the object according to FIG. 7 along the axis FF, Fig. 8: the behavior of a blade according to Fig. 3 during the cutting process,

9: the behavior of a blade according to FIGS. 4 or 7 during the cutting process in a first state,

10: the behavior of a blade according to FIGS. 4 or 7 during the cutting process in a second state, FIG. 11: the behavior of a blade according to FIGS. 4 or 7 in a third state,

12: the behavior of a blade according to FIGS. 4 or 7 in a fourth state,

13: the behavior of a blade according to FIG. 6 during the cutting process in a first state,

14: the behavior of a blade according to FIG. 6 during the cutting process in a second state,

15: the behavior of a blade according to FIG. 6 during the cutting process in a third state, FIG. 16: and the behavior of a blade according to FIG. 6 during the cutting process in a fourth state.

The figures show a knife 13 according to the invention with a handle 14 and a knife blade 1 according to the invention. This is particularly shown in FIG. 1 shown. According to the invention, the blade 1 has two blade sides 2, 3, a blade back 4 and a blade edge 5 and is designed as a corrugated blade. A plurality of corrugations 6 with corrugation peaks 7 and corrugation valleys 8 are preferably arranged on the two blade sides 2, 3 over the entire length Kider blade 1 or essentially over the entire length Ki of the blade 1 in the exemplary embodiment according to the figures. In the exemplary embodiment according to FIG. 1, the wave troughs 8 do not overlap the width center M of the blade 1. Expediently and in the exemplary embodiment, the shafts 6 extend perpendicular to the longitudinal direction I or to the longitudinal axis A of the blade 1 along the entire height K _{h of} the blade 1 or essentially along the entire height K _{h of} the blade 1. In the exemplary embodiment according to FIG. 1, the blade is ground straight on one side on the blade edge 5 in such a way that a grinding angle α of 25 ° to 30 ° results.

In the context of the invention, the grinding angle a means in particular the angle formed by the two surfaces of the blade edge 5. If the blade 1 or blade edge 5 is ground on one side, the grinding angle a thus means the angle formed by the ground side or surface of the blade edge 5 and the unge-ground side or surface of the blade edge 5. This can be seen in FIGS. 4a and 7a. If the blade 1 or the blade edge 5 is ground on both sides, the grinding angle a means the angle formed by the two ground sides or surfaces of the blade edge 5. This is shown in Figures 3a and 6a. FIGS. 3a and 6a also show that the two ground surfaces of the blade edge 5 contribute equally to the grinding angle a, so that the blade 1 or the blade edge 5 is ground symmetrically. Preferably, and in the exemplary embodiment according to the figures, the blade 1 is otherwise only sharpened on the blade edge 5 and the area of the blade 1 that is ground for this purpose forms the blade edge 5. It is recommended that the cut of the blade 1 or the blade edge 5 is straight.

In the context of the invention, a straight cut means in particular that the sharpened blade edge 5 or the flat extension of the ground surfaces or the ground surface of the sharpened blade edge 5 are expediently oriented straight and flat in the longitudinal direction I of the blade. This can be seen in FIGS. 1, 3, 4, 6 and 7. The ground surfaces or the ground surface of the blade edge 5 follow / follow recommended and in the exemplary embodiment in their two-dimensional extent not the individual shafts 6, so that a straight cut results. Appropriately and in the exemplary embodiment, the blade 1 tapers in terms of its width K _b from the blade back 4 to the blade edge 5 and preferably tapers conically in the exemplary embodiment according to the figures. The tapering or conical course of the blade 1 with regard to its width K _b from the blade back 4 to the blade edge 5 in the unpolished state of the blade 1 is shown in FIGS. 2a and 5a. In the context of the invention and in the exemplary embodiment, the tapering of the blade extends in terms of its width K _b over the entire length Ki of the blade 1 or essentially over the entire length Ki of the blade 1 and also in particular from the blade back 4 to the blade edge 5 the entire height K _{h of} the blade 1. In the sharpened or ground state of the blade 1 or the blade edge 5 then expediently and in the embodiment according to the figures (Fig. 3a, 4a, 6a, 7a) a first primary bevel from the back of the blade results 4 to the blade edge 5 and a second secondary bevel, which is recommended to be formed by the sharpened or ground blade edge 5 and extends to the cutting edge 9.

In the context of the invention and in the exemplary embodiment, the blade 1 is designed in one piece and, in the exemplary embodiment according to the figures, may in particular consist of at least one steel or essentially consist.

According to a preferred embodiment of the invention and in the embodiment, the waves 6 arranged on the two blade sides 2, 3 run parallel to one another in such a way that a wave crest 7 on one blade side 2, 3 corresponds to a wave trough 8 on the other blade side 2, 3. This can be seen in FIGS. 2 and 5, for example.

Recommended and in the exemplary embodiment, the waves 6 each have an identical or essentially identical wave height W _h , where wave height in this context means in particular the fleas of a wave 6 from its wave trough 8 to its wave crest 7, i.e. the fleas with which one Wave 6 extends transversely from wave trough 8 to wave crest 7, in particular perpendicular to the flat extension of the respective blade side 2, 3.

According to a preferred embodiment and in the embodiment according to FIGS. 1 to 5, the wave height W _{h is} less than or equal to the smallest width Sb of the blade 1 in the unpolished state. In the context of the invention, the term unpolished state of the blade 1 means in particular the state in which the blade 1 or the blade edge 5 has not yet been sharpened or ground, so that there is not yet a sharpened or ground blade edge 5. Figures 2, 2a, 5 and 5a show this state. The smallest width Sb of the blade 1 in the unpolished state is then recommended, and in the exemplary embodiment the width on the underside or cutting edge 9 of the unpolished blade 1 (FIGS. 2a and 5a). This smallest width Sb of the blade 1 in the unpolished state can also be determined within the scope of the invention in the ground state of the blade 1. To be the two converging blade sides 2, 3 or their surfaces, ie the primary bevel, imaginarily extended in the direction of the cutting edge 9, ie drawn to the lower end of the blade edge 5 or the secondary bevel (FIG. 3b). At this point or at the cutting edge 9, the original width Sb of the blade 1 in the unground state can then be determined from the distance between the imaginary extensions of the blade sides 2, 3.

According to a particularly recommended embodiment and in the embodiment according to FIGS. 1 to 5, the wave troughs 8 do not overlap the width center M of the blade 1. In this context, the center of width M means in particular the plane running centrally through the blade 1 from the blade back 4 to the blade cut 5 _{in relation to the blade width K b.} The wave troughs 8 which do not intersect the width center M can be seen in particular in FIGS. 2 and 2a. The lowest point of a wave trough 8 does not intersect the width center M of the blade 1. Thus, the waves 6 expediently do not overlap the width center M of the blade 1 with regard to their wave height W _h.

In Fig. 4, a blade 1 according to the invention is shown in a preferred imple mentation form, in which the wave troughs 8 do not intersect the width center M of the blade 1 and in which the blade 1 or the blade edge 5 is ground straight on one side. The result is a bevel on the blade edge 5, which is serrated or designed as a zigzag wave bevel. 3 shows a blade 1 according to the invention in a recommended embodiment in which the wave troughs 8 do not intersect the width center M of the blade 1 and in which the blade 1 has a straight cut on the blade edge 5 on both sides. The result is a bevel that is serrated alternately, so that the bevels of the two blade sides 2, 3 consist of triangles directly lined up next to one another. These triangles on the first Blade side 2 are arranged offset in comparison to the triangles on the second blade side 3 (shown in dashed lines in FIG. 3).

According to a further recommended embodiment of the blade 1 according to the invention, which is shown in FIGS. 5 to 7a, the wave height W _{h is} greater than the smallest width Sb of the blade 1 in the unpolished state. This can be seen in particular in FIG. 5a. Expediently and in the exemplary embodiment, the wave height W _h corresponds to between 1, 2 and 2.5 times the smallest width Sb of the blade 1 in the unpolished state. In the execution example according to FIG. 5a, the wave height W _{h may be} about 2.0 times the smallest width Sb of the blade 1 in the unpolished state. According to a particularly preferred embodiment and in the embodiment according to FIGS. 5 to 7 a, the wave troughs 8 overlap the width center M of the blade 1 at least in some areas. This can be seen in particular in FIGS. 5 and 5a. If the blade 1 tapers according to the recommended embodiment and in the execution example in terms of its width K _b from the blade back 4 to the blade edge 5 and in particular tapers conically, it is within the scope of the invention that the wave troughs 8 the width center M of the blade 1 at least in one the blade edge 5 associated part of the fleas K _{h of} the blade 1 overlap (Figures 5 and 5a). In the exemplary embodiment (FIG. 5 a), the wave troughs 8 may overlap the width center M of the blade 1, preferably along at least 5% of the fleas K _{h of} the blade 1 in a part assigned to the blade edge 5.

In the preferred embodiment according to FIG. 7, the wave troughs 8 intersect the width center M of the blade 1 and the blade 1 has a straight cut on one side in the area of the blade edge 5. The result is a bevel of the blade edge 5, which is designed to be jagged or which is designed as a zigzag wave bevel. The recommended embodiment according to FIG. 6 shows a blade 1, in which the wave troughs 8 intersect the width center M of the blade 1 and which is ground straight on both sides in the area of the blade edge 5. Expediently, a bevel results on both sides from triangles arranged offset next to one another, which are jagged in the area of the wave troughs 8 which intersect the width center M of the blade 1. The triangles are preferably arranged offset on the blade side 2 with respect to the triangles on the blade side 3 (shown in dashed lines in FIG. 6).

In the context of the invention and in the exemplary embodiment, the smallest width of the blade Sb in the unsanded state is less than or equal to 0.3 mm and is preferably between 0.1 and 0.3 mm. Recommended and in the embodiment according to FIGS. 1 to 5a, the wave height W _{h is} between 0.1 and 0.3 mm. In the exemplary embodiment according to FIGS. 5 to 7a, the wave height W _{h is} expediently a maximum of 0.6 mm and preferably between 0.1 and 0.6 mm.

Preferably, and in the exemplary embodiment according to the figures, the greatest width of the blade back R _{b is} less than or equal to 5.0 mm and is expediently and in the exemplary embodiment according to the figures between 1.0 and 5.0 mm. In this context, the width of the blade back R _{b means} in particular the greatest extension of the blade back transversely, in particular perpendicular to the longitudinal direction I or to the longitudinal axis A of the blade 1 and transversely, in particular perpendicular to the vertical extent of the blade 1.

A particularly preferred embodiment of the invention is characterized in that the cutting edge 9 of the blade 1 or the blade edge 5 is straight and / or serrated in the ground state. A straight cutting edge 9 of the blade edge 5 in the ground state means in particular that the cutting edge 9 is along a straight, uninterrupted line (Fig. 3) runs. A serrated cutting edge 9 of the blade edge 5 in the ground state means in particular that the cutting edge 9 runs along a serrated line (FIGS. 4 and 7). Appropriately, there is a straight, uninterrupted cutting edge 9 of the blade edge 5 in the ground state when the wave troughs 8 do not intersect the width center M of the blade 1 according to the preferred embodiment and when the blade 1 is ground straight on both sides (FIG. 3). A cutting edge 9 of the blade edge 5 which is straight in areas and interrupted by serrations is preferably obtained when the wave troughs 8 intersect the center of width M of the blade 1 according to the preferred embodiment at least in areas and when the blade 1 is ground straight on both sides (FIG. 6). A serrated cutting edge 9 of the blade edge 5 in the ground state (zigzag wave) is preferably obtained when the wave troughs 8 do not overlap or intersect the width center M of the blade 1 according to the preferred embodiment variant and when the blade edge 5 is ground straight on one side ( Figures 4 and 7).

Recommended and in the exemplary embodiment according to the figures, the length of the waves Wi is greater than the greatest width R _{b of} the blade back 5 and greater than the smallest width Sb of the blade 1 in the unpolished state. Expediently and in the exemplary embodiment, the waves also each have an identical or essentially identical wavelength Wi.

Preferably, and in the exemplary embodiment (FIG. 1), the blade back 4 extends over at least 70% of the length Ki of the blade 1 parallel or essentially parallel to the blade edge 5 or the cutting edge 9. In the exemplary embodiment according to FIG. 1, the blade back 4 runs in a front section 10 of the blade 1 in the shape of an arc or a circular arc towards the end 11 of the blade edge 5. Recommended, and in the exemplary embodiment according to the figures, the wave crests 7 taper to a point or essentially a point on the two blade sides 2, 3 and the wave troughs 8 taper to a point or essentially a point at both blade sides 2, 3.

Fig. 8 shows the behavior of a blade 1 according to FIG. 3 during the cutting process. When cutting under pressure and tension, a straight, smooth surface 15 is created on the material to be cut 17. The gaps 16 between the material to be cut 17 and the blade sides 2, 3 ensure extremely low adhesion and friction because only the wave crests 7 touch the material to be cut 17.

FIG. 9 shows the behavior of a blade 1 according to FIGS. 4 or 7 during the cutting process in a first state. When cutting, the blade 1 transfers the shape of the blade sides 2, 3 into the material to be cut 17 when it is cut with pressure from the blade edge 5. In the subsequent cutting on train (Fig. 10), the resulting wedge effect pushes the material to be cut 17 apart and gaps 16 arise between the Material to be cut 17 and the corrugated surfaces 2, 3. As soon as the corrugation peaks 7 of the blade sides 2, 3 have passed the tips of the material surfaces 18 (Figures 11 and 12), the material to be cut 17 is completely detached from the wave surfaces 2, 3 and no longer adheres (Fig. 12).

13 shows the behavior of a blade 1 according to FIG. 6 during the cutting process in a first state. When cutting under pressure, the material to be cut 17 takes on the shape of the blade edge 5 on the material surfaces 18. The alternately arranged bevels push the material to be cut 17 apart, so that mutual gaps 16 are created. In the subsequent cutting to tension (Figures 14 to 16), a wedge effect arises, which pushes the material to be cut 17 apart until it is completely detached from the blade surfaces 2, 3 (FIG. 16).

Claims

Patent claims:

1. Blade, in particular knife blade (1), wherein the blade (1) has two blade sides (2, 3), a blade back (4) and a blade edge (5) and is designed as a corrugated blade, with both blade sides (2, 3 ) over at least 60% of the length (Ki) of the blade (1), preferably over at least 80%, preferably over at least 95%, particularly preferably over the entire length (Ki) of the blade (1) or essentially over the entire length (Ki) the blade (1) has a plurality of waves (6) with wave crests (7) and wave troughs (8), the waves (6) extending transversely, in particular perpendicular, to the longitudinal direction (I) of the blade (1) and / or part-circular along at least 80% of the height (Kh) of the blade (1), preferably along at least 90%, preferably along at least 95%, particularly preferably along the entire height (Kh) of the blade (1) or essentially along the entire height (Kh) of the blade (1) and wherein the blade (1) at least at the blade edge (5) is ground on one or both sides in such a way that a grinding angle (a) of 5 ° to 60 °, preferably 10 ° to 50 °, preferably 15 ° to 40 ° and particularly preferably 25 ° to 30 ° results.

2. Blade according to claim 1, wherein the blade (1) tapers in terms of its width (Kb) from the blade back (4) to the blade edge (5) and in particular tapers conically and / or concave.

3. Blade according to one of claims 1 or 2, wherein the blade (1) is designed in one piece and in particular consists or essentially consists of at least one steel and / or at least one ceramic.

4. Blade according to one of claims 1 to 3, wherein the waves (6) arranged on the two blade sides (2, 3) run parallel to one another in such a way that a wave crest (7) of one blade side (2, 3) has a wave trough (8) corresponds to the other side of the blade (2, 3).

5. Blade according to one of claims 1 to 4, wherein the waves (6) each have an identical or substantially identical wave height (W _h ).

6. Blade according to one of claims 1 to 5, wherein the wave height (W _h ) is less than or equal to the smallest width (S _b ) of the blade (1) in the unpolished state.

7. Blade according to one of claims 1 to 6, wherein the wave troughs (8) do not intersect the width center (M) of the blade (1).

8. Blade according to one of claims 1 to 5, wherein the wave height (W _h ) is greater than the smallest width (S _b ) of the blade (1) in the unpolished state and in particular between 1.1 and 3.0 times, preferably between 1, 2 and 2.5 times, particularly preferably between 1, 3 and 2.3 times and very particularly preferably between 1.5 and 2.0 times the smallest width (S _b ) of the blade (1) in the unpolished state .

9. Blade according to claim 8, wherein the wave troughs (8) the width center (M) of the blade (1) at least partially overlap.

10. Blade according to one of claims 1 to 9, wherein the smallest width (S _b ) of the blade (1) in the unsanded state is less than or equal to 0.5 mm, in particular less than or equal to 0.3 mm and preferably between 0.025 and 0, 3 mm, is preferably between 0.05 and 0.3 mm, particularly preferably between 0.1 and 0.3 mm.

11. Blade according to one of claims 1 to 10, wherein the greatest width (R _b ) of the blade back (4) is less than or equal to 7.0 mm, in particular less than or equal to 5.0 mm and preferably between 0.1 and 5 .0 mm, preferably between 0.5 and 5.0 mm, particularly preferably between 1.0 and 5.0 mm.

12. Blade according to one of claims 1 to 11, wherein the cutting edge (9) of the blade (1) or the blade edge (5) is straight and / or serrated in the ground state.

13. Blade according to one of claims 1 to 12, wherein the length (Wi) of the shafts (6) is greater than the greatest width (R _b ) of the blade back (4) and / or greater than the smallest width (S _b ) of the blade (1) in the unsanded state.

14. Blade according to one of claims 1 to 13, wherein the blade back (4) over at least 50%, preferably over at least 60%, preferably over at least 70% of the length (Ki) of the blade (1) parallel or substantially parallel to Blade edge (5) and / or to the cutting edge (9) of the blade (1) and particularly preferably in a front section (10) of the blade (1) runs in an arc shape, in particular a circular arc, towards the end (11) of the blade edge (5).

15. Blade according to one of claims 1 to 14, wherein the wave crests (7) on at least one blade side (2, 3) are pointed or essentially tapered and / or where the wave troughs (8) on at least one blade side (2, 3 ) taper to a point or essentially to a point.