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BR-112023010620-B1 - Cutting tool with support section for pre-adjusted sharpening angle.

BR112023010620B1BR 112023010620 B1BR112023010620 B1BR 112023010620B1BR-112023010620-B1

Abstract

CUTTING TOOL WITH SUPPORT SECTION FOR PRE-ADJUSTED SHARPENING ANGLE. The present invention relates to a cutting tool (1), especially a knife, comprising: at least one blade (2) with a blade sheet (2a) and an edge (2b). In order to be able to precisely sharpen or polish the cutting tool (1) even without a sharpening jig, it is provided, according to the invention, that the cutting tool (1) has a support section (4), which defines a support plane (AE), with which the cutting tool (1) can be placed on a flat base (U) in a stable manner for sharpening and/or polishing the edge (2b), so that the blade sheet (2a) is aligned at a working angle (a) in the range of 65 to 80° relative to the base (U). A set for sharpening and/or polishing the cutting tool (1) as well as a corresponding process are also disclosed.

Inventors

  • Otmar Horl
  • Timo Horl

Assignees

  • HORL 1993 GMBH

Dates

Publication Date
20260310
Application Date
20211209
Priority Date
20201216

Claims (10)

  1. 1. Cutting tool (1), especially knife, characterized in that it comprises: at least one blade (2) with a blade sheet (2a) and an edge (2b), wherein the cutting tool (1) has at least one support section (4), which defines a support plane (AE), with which the cutting tool (1) can be stably placed on a flat base (U) for sharpening and/or polishing the edge (2b), such that the blade sheet (2a) is aligned at a working angle (α) in the range of 65 to 80° relative to the base (U), wherein the cutting tool (1) has a handle (3), wherein the handle (3) preferably has at least one of the support sections (4).
  2. 2. Cutting tool (1), according to the preceding claim, characterized in that the working angle (α) is in the range of 70 to 75°.
  3. 3. Cutting tool (1), according to any of the preceding claims, characterized in that the support section (4) is disposed on one side of the handle (3) pointing away from the cutting edge (2b).
  4. 4. Cutting tool (1), according to any of the preceding claims, characterized in that the support section (4) has at least three support points (4a, 4b, 4b) that lie in the support plane (AE), which are not in a line, and preferably at least 25%, 30% or 40% of the total length (L) of the cutting tool (1), which is preferably measured between a blade tip (2d) and an end of a handle (3) opposite to that, lies between two of these support points (4a, 4b), and preferably at least one of these support points (4b) has a distance (Y) from an extension plane (E) of the blade sheet (2a) which is greater than 1%, 2% or 3% of the total length (L) of the cutting tool (1).
  5. 5. Cutting tool (1), according to any of the preceding claims, wherein the cutting tool (1) is characterized in that it has two support sections (4), which are arranged on different sides of the blade sheet (2a) and define a respective support plane (AE), with which the cutting tool (1) can be placed on the flat base (U) in a stable manner for sharpening the edge (2b), so that the blade sheet (2a) is aligned respectively at the same working angle (α) with respect to the base (U).
  6. 6. Cutting tool (1), according to any of the preceding claims, characterized in that the support section (4) is arranged in the cutting tool (1) in an adjustable manner.
  7. 7. Cutting tool (1), according to any of the preceding claims, characterized in that the support section (4) is adjustable to change the working angle (α) between at least two different positions, preferably the working angle (α), in a first position of the support section (4), is 70° and, in a second position of the support section (4), is 75°.
  8. 8. Assembly, characterized in that it comprises a cutting tool (1), as defined in any of the preceding claims, and a sharpening and/or polishing tool (5) with at least one sharpening and/or polishing surface (5b), which rotates, during the rolling of the sharpening and/or polishing tool (5) on the flat base (U), in a plane aligned perpendicularly to the base (U).
  9. 9. Assembly, according to the preceding claim, characterized in that the sharpening and/or polishing tool (5) has a cylindrical handle body (5c), wherein, at each axial end of the handle (5c), there is a sharpening and/or polishing surface (5b).
  10. 10. Process for sharpening and/or polishing a cutting tool (1), as defined in any of the preceding claims, characterized in that the process comprises the following steps: a. placing the cutting tool (1) with the support plane (AE) on the flat base (U), so that the blade sheet (2a) is disposed at a working angle (α) in the range of 65 to 80 degrees relative to the base (U). b. placing the edge (2b) on a sharpening and/or polishing surface (5b) of a sharpening and/or polishing tool (5) aligned perpendicularly to the base (U). c. sharpening and/or polishing the edge (2b) by performing a relative movement between the sharpening and/or polishing surface (5b) and the edge (2b) (in the longitudinal direction of the edge (2b)).

Description

[001] The present invention relates to a cutting tool, especially a knife, such as a kitchen knife, comprising: at least one blade with a blade sheet and an edge. [002] To sharpen or polish the edge, sharpening or polishing tools with rotating cutting or polishing surfaces may be used. Such sharpening or polishing tools, which are designated as "roller sharpeners", are known, for example, from document DE 202020001180 U1 or document EP 3278928 A. [003] For positioning the cutting edge in relation to the sharpening or polishing tool, a sharpening jig can be used. With this sharpening jig, the cutting edge is positioned at a sharpening angle in relation to the sharpening surface, in order to sharpen the cutting edge at the predetermined sharpening angle using the sharpening jig. [004] For a satisfactory treatment result, three components must be present and cooperate, namely: the cutting tool, the sharpening jig and the sharpening-polishing tool. This increases the user's cost in logistics and coordination for the sharpening or polishing treatment of the cutting tool. [005] To remedy this problem, the present invention provides the cutting tool according to claim 1, the assembly according to claim 8 and the process according to claim 10. [006] The cutting tool according to the invention is especially a knife or kitchen knife, which comprises at least one blade with a blade sheet and an edge, wherein the cutting tool has at least one support section, which defines a support plane, with which the cutting tool can be placed stably on a base for sharpening and/or polishing the edge, such that the blade sheet (or its extension plane) is aligned at a working angle in the range of 65 to 80° relative to the base. The working angle designates the angle between the blade sheet (or its extension plane) and the support plane. When the support plane rests on the base, the working angle designates the angle between the blade sheet (or its extension plane) and the base. The sharpening angle designates the angle between the extension plane of the blade sheet and the sharpening surface. In a roller sharpener mentioned earlier, the sharpening surface rotates in a plane aligned perpendicularly to the base. The sharpening angle β is consequently calculated from the working angle α using Formula I: Formula I: β = 90° - α. [007] "Stable" means, within the scope of the present invention, that the cutting tool rests against the base, even during sharpening or polishing, maintaining the working angle with the support plane. In this case, the cutting tool is preferably held securely by a user and pressed with the support plane against the base. It is desirable, although not necessary, that the cutting tool rests independently, i.e., without the effect of external force, with the stable support section against the base. Preferably, the center of gravity of the cutting tool, projecting onto the base, is in the region (between the support points) of the support section when the cutting tool rests against the base with the support section. To apply a counterforce exerted in relation to the sharpening/polishing tool on the blade during sharpening or polishing, it is advantageous that the cutting tool, during sharpening or polishing, be held by the user and pressed against the base with the support section. During sharpening or polishing, the blade edge is preferably opposite the base, and the blade pressure is directed towards the base (compare Figure 4). However, it is also possible for the support section on the cutting tool to be arranged in such a way that, during sharpening or polishing, the blade edge points towards the base and the blade pressure points away from the base. During the production of the cutting tool, or possibly by adjusting the support section before the start of sharpening or polishing, the working angle can be fixed in the range of 65 to 80°. During sharpening or polishing, the working angle is preferably constant so that the edge is sharpened uniformly and well. [008] Advantageous developments of the invention are the subject of the dependent claims. [009] It can be advantageous for the working angle to be in the range of 70 to 75°. Sharpening angles of 15° or 20° prove particularly advantageous in practice. A sharpening angle of 15° is suitable for sharpening a very sharp blade, for example, a fine-cutting knife used for cutting meat. With a sharpening angle of 20°, the edge is less fine but is subject to less wear. Depending on the choice of sharpening angle in the range of 15 to 20°, which corresponds to a working angle of 70 to 75°, the sharpness and wear properties of the edge can be adjusted. [0010] It may be useful for the cutting tool to have a handle body, preferably having at least one support section, the support section preferably being located on the side of the handle opposite the cutting edge (for example, on the back of the handle). A clamping force can be applied to the handle body, especially dur