Device for grinding and / or polishing a cutting tool

Abstract

Device for grinding and / or polishing a cutting tool, preferably a household knife, comprising: - a device body (2); - an axle (3) rotatably mounted in the device body (2); - a first and a second substantially circular disc (4, 5) connected to the rotatable axle (3) in such a way that when the device body (2) is drawn along a surface, preferably a table surface, the two discs (4, 5) rotate relative to the device body (3), and wherein at least the first disc (4) is designed for grinding and is such that when an edge of the cutting tool is placed against the first disc (4) and the device body (2) is drawn over the surface, preferably manually, the first disc (4) grinds the edge due to the rotation.

Description

[0001] The invention relates to a device for grinding and / or polishing as well as deburring and / or honing a cutting tool, preferably a household knife.

[0002] From US patent 1,388,882 A, a device for grinding a cutting tool is known, in which the cutting tool is clamped between a grinding wheel and a guide wheel for grinding.

[0003] Devices for grinding a cutting tool are also known from US 2013 / 0295824 A1 and US 2,475,110, as well as DE 297 03 326 U1, on which the preamble of the independent claim is based. Devices for grinding and / or polishing, as well as deburring and / or honing, are also well known from the prior art. For example, devices are known from the free encyclopedia under the term "grinding stone" in which the abrasive is applied to blocks or round, or possibly square, edges. To grind a cutting tool, the operator must hold the tool in one hand and the cutting tool to be ground or polished in the other. The device must then be drawn by the operator over the cutting edge of the cutting tool to be ground or polished.

[0004] This method has the disadvantage that, to achieve a good grinding result, the same angle between the cutting edge and the grinding tool should ideally always be maintained. This is particularly difficult because both the cutting tool and the grinding tool must be held virtually freely in the air by the operator, thus requiring a high degree of dexterity.

[0005] The invention is therefore based on the objective of proposing a device that is easy to use and also has an increased grinding effect.

[0006] The problem is solved according to the invention by the features mentioned in claim 1. Advantageous embodiments of the invention are described in the dependent claims.

[0007] According to the invention, a device is proposed which has a disc on each side of a substantially cylindrical device body, wherein the two discs are detachably connected via an axle mounted inside the device body and the axle is rotatable relative to the device body, so that an operator, when placing an edge of the cutting tool against one of the two discs and drawing the device body across a surface, can grind and / or polish the edge. For the purposes of this application, grinding also includes, in particular, deburring the edge, and polishing includes honing the edge of the cutting tool.

[0008] The device according to the invention is used for grinding and / or polishing a cutting tool with an edge that is ground either on one side or on both sides. Such cutting tools are, in particular, commercially available household or kitchen knives. However, knives with a coarse serrated edge, as well as any type of outdoor and / or folding knife, also fall under the category of cutting tools within the meaning of the present application.

[0009] In contrast to grinding devices known from the prior art, with the device according to the invention for grinding and / or polishing, the operator only needs to position the cutting tool on the surface in a first step such that the cutting edge of the cutting tool rests against one of the two discs. In a second step, the operator then pulls the device body along the surface to grind and / or polish the cutting edge. Because both the device according to the invention for grinding and / or polishing and the cutting tool rest on the surface, simplified and more precise positioning is possible, resulting in an improved grinding and / or polishing result.

[0010] The invention is independent of the type of surface along which the device is drawn. For example, the surface could be a tabletop or a shelf, particularly a kitchen shelf. In principle, any object that has a substantially flat surface, at least in sections, can serve as the surface, allowing the cutting tool to be positioned on the surface and the device according to the invention to be drawn across this section of the object.

[0011] An advantageous embodiment of the invention provides that the first and / or the second disc are detachably connected to the axle, making them interchangeable. Because both the first and second discs are detachably connected to the axle, they can be easily replaced by the operator. This can be advantageous, for example, when one of the two discs needs to be replaced, perhaps due to age, or when the operator wishes to better adapt the grinding and / or polishing device to the cutting tool. In particular, when different cutting tools are to be ground and / or polished, the interchangeability of the two discs can be beneficial, allowing the device to be precisely adapted to the respective grinding tool.For example, the device can be configured such that one disc has an abrasive for grinding the cutting edge and the other disc has a means for honing the cutting edge, so that the cutting edge of the cutting tool can be both ground and honed. An advantageous embodiment of the invention can also provide that the first disc has a first threaded bolt and / or the second disc has a second threaded bolt, so that the first and / or the second disc can be detachably screwed to the axle. In this way, replacement, e.g., due to wear or a change in the grinding process, is relatively quick and easy.

[0012] A further advantageous embodiment of the invention provides that at least the first disc has a first abrasive and that the first abrasive comprises ruby, sapphire, diamond, glass, ceramic, corundum or carbide or a combination of the aforementioned materials.

[0013] In an alternative embodiment of the invention, the second disc is designed for polishing, such that, preferably when the cutting edge of the cutting tool is placed against the second disc and the device body is drawn across the surface, preferably manually, the second disc polishes the cutting edge due to its rotation. A further advantageous embodiment may, in particular, provide that the second disc is designed such that at least one depression is provided that is substantially concentric with the center of the second disc.

[0014] In another alternative embodiment of the invention, the second disc is also designed for grinding and preferably comprises a second abrasive material, namely ruby, sapphire, diamond, glass, ceramic, corundum, or carbide, or a combination of these materials. In particular, the embodiment provides that the first and second abrasive materials are different, so that the first and second discs achieve different grinding effects. Due to the different grinding effects of the two discs, it is possible, for example, to perform a coarse grinding of the cutting edge of the cutting tool with the first disc and a fine grinding of the cutting edge with the second disc, in order to achieve the most perfect grinding result possible.

[0015] The invention is explained in more detail with reference to the following drawings. They show: Fig. 1: a side view of the device according to the invention for grinding and / or polishing, and Fig. 2 : a perspective view of the in Fig. 1 the device shown according to the invention.

[0016] Figure 1 Figure 1 shows the grinding and / or polishing device 1 according to the invention in a side view. The device 1 comprises a substantially cylindrical device body 2, which is, for example, made of wood and preferably has a diameter of a few centimeters. The device body 2 is designed in its shape and material such that it fits as comfortably as possible in the hand of an operator, so that the operator can easily grasp the device body 2 with their hand and pull it across a surface when using the device 1.

[0017] The device body 2 has an axis 3 rotatably mounted relative to it. The axis 3 extends from the end face to a side facing away from the end face inside the device body 2 and is designed at both ends such that a disk 4, 5 can be detachably attached to each.

[0018] The device according to the invention for grinding and / or polishing 1 further comprises a first and a second circular disc 4, 5, wherein one disc 4 is detachably connected to the axis 3 at the first end face and the other disc 5 is detachably connected to the side of the device body 2 facing away from the end face.

[0019] The detachable attachment of the two discs 4, 5 to the axis 3 allows the grinding and / or polishing device 1 to be adapted as desired. For example, the device 1 can be adapted to different cutting tools. Replacing an old or defective disc is also easily accomplished. To enable particularly quick and easy disc replacement, each disc preferably has a threaded bolt 11, 12, via which the respective disc 4, 5 can be detachably attached to the axis 3. The invention is not limited to both discs 4, 5 being detachably connected to the axis 3, e.g., via the respective threaded bolts 11, 12. It is also conceivable that one of the two discs is permanently connected to the axis and only the other is detachably connected.

[0020] The first disc 4 comprises a first abrasive for grinding the cutting edge of the cutting tool. The first abrasive preferably comprises ruby, sapphire, diamond, glass, ceramic, corundum, or carbide. Furthermore, the first abrasive may also comprise a combination of the aforementioned materials. Using the first disc 4 and the first abrasive, the cutting edge of the cutting tool can be ground by positioning the cutting tool on the surface and then drawing the fixture body 2 across the surface for grinding.

[0021] The second disc 5 can be designed either for polishing or for grinding the cutting edge of the cutting tool. Fig. 1 This fact is indicated by the reference numbers 8 and 10 separated by a semicolon.

[0022] In the case that the second disc 5 is intended for polishing, it has at least one, preferably several, recesses 8 that are essentially concentric with the center of the second disc. The rotation of the second disc 5 caused by the movement of the device body 2 across the surface of the recesses 8 results in an improved polishing effect.

[0023] The second disc 5 can also comprise a second abrasive 10, which preferably includes ruby, sapphire, diamond, glass, ceramic, corundum, or carbide. Furthermore, the second abrasive 10 can also comprise a combination of the aforementioned materials. The second abrasive is preferably designed such that the second disc 5 with the second abrasive exhibits a different grinding effect compared to the first disc 4 with the first abrasive. This different grinding effect can be achieved in various ways. For example, the different grinding effect can be achieved by the first and second abrasive comprising different abrasive materials from the aforementioned materials. It can also be achieved by applying different grit sizes to the discs.However, varying densities of the material grains, particularly the diamond grains, on individual discs can also lead to different grinding effects. The abrasive is usually nickel-plated onto the discs, allowing the grinding effect to be adjusted by varying the thickness of the nickel layer around the grains.

[0024] To ensure a smooth and quiet running motion of the two discs when the device body 2 is pulled across the surface, each disc includes a circumferential rubber ring 6, 7. The rubber rings are each fixed by a groove circumferential to the respective disc, so that they cannot slip but are still replaceable.

[0025] Fig. 2 shows a perspective view of the in Fig. 1The device shown and described above according to the invention 1. The device shown in Fig. 2 The device 1 shown is configured such that the first disc 4 is used for grinding and the second disc 5 is used for polishing the cutting edge of the cutting tool.

[0026] With the aid of the device 1 configured according to the invention in this way, the cutting edge of the cutting tool can be ground in a first step. For this purpose, the cutting edge of the cutting tool is placed on the surface and positioned accordingly with respect to the first disc 4 of the device 1. Subsequently, the device body 2 is pulled along the surface by the operator. Fig. 2 This pulling motion is indicated by the arrow "A". The pulling motion causes a rotational movement of the first disc 4, which in turn sharpens the cutting edge.

[0027] In a second step, after grinding, the cutting edge is repositioned towards device 1. This time, however, it is not positioned towards the first wheel 4, but rather towards the second wheel 5, which is used to polish the cutting edge. Again, the operator pulls the device body 2 along the surface, so that the pulling motion and the associated rotation of the second wheel 5 polish the cutting edge. In this way, the cutting edge can be both ground and polished.

[0028] It goes without saying that the invention is not limited to the example described above, but that the device 1 can also be configured or used in other ways. For example, as already indicated, the second disc 5 can also be used for grinding, so that in a first step a coarse grinding can be carried out with the first disc 4 and in a second step a finer grinding of the cutting edge can be carried out with the second disc 5. Of course, only one of the two discs of the device 1 according to the invention can also be used either for grinding or for polishing the cutting edge of the cutting tool. Reference symbol list

[0029] 1 Device for grinding and / or polishing 2 Device body 3 Axis 4 First disc 5 Second disc 6 First rubber ring 7 Second rubber ring 8 Concentric recess 9 First abrasive 10 Second abrasive 11 First threaded bolt 12 Second threaded bolt Pulling motion

Claims

1. A device for grinding and / or polishing a cutting tool, preferably a household knife comprising: a cylindrical device body (2); an axle (3) rotatably supported in the device body (2); characterized by a first and a second substantially circular disc (4, 5) arranged at different axial ends of the device body (2) and each connected to the rotatably supported axle (3), so that when the device body (2) is pulled along a surface, preferably a table surface, the two discs (4, 5) rotate relative to the device body (2), and wherein at least the first disc (4) is designed for grinding and is such that when a cutting edge of the cutting tool is applied to the first disc (4) and the device body (2) is pulled over the surface, preferably manually, the first disc (4) grinds the cutting edge due to the rotation, wherein the first disc (4) has a grinding surface on the end face, wherein the second disc (5) is designed for grinding or polishing the cutting tool and has a grinding or polishing surface on the end face, wherein the two discs (4, 5) each taper towards the end face by rounding.

2. The device according to claim 1, wherein the first and / or the second disc (4, 5) are detachably connected to the axle (3) so that they are interchangeable.

3. The device according to the preceding claim, wherein the first disc (4) has a first lathed-on threaded bolt (11) and / or the second disc (5) has a second lathed-on threaded bolt (12), so that the first and / or the second disc (4, 5) can be screwed releasably to the axle (3).

4. The device according to at least one of claims 1 to 3, wherein at least the first disc (4) comprises a first abrasive (9) and the first abrasive (9) comprises ruby, sapphire, diamond, glass, ceramic, corundum or carbide or a combination of said materials.

5. The device according to at least one of claims 1 to 4, wherein further the second disc (5) is configured for polishing, so that when the cutting edge of the cutting tool is applied to the second disc (5) and the device body (2) is pulled over the surface, preferably manually, the second disc (5) polishes the cutting edge due to the rotation.

6. The device according to the preceding claim, wherein the second disc (5) is formed such that at least one recess (8) is provided substantially concentric with the centre of the second disc (5).

7. The device according to at least one of claims 1 to 4, wherein the second disc (5) is also adapted for grinding and comprises a second abrasive (10) and the second abrasive (10) comprises ruby, sapphire, diamond, glass, ceramic, corundum or carbide or a combination of said materials.

8. The device according to the preceding claim, wherein the first and second abrasive (9, 10) are different so that the first and second discs (4, 5) achieve a different abrasive effect.

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