SCISSORS THAT CAN BE TRANSFERRED BETWEEN A CUTTING AND A GRINDING CONFIGURATION

Description

[0001] The present invention relates to a cutting tool, in particular scissors, comprising: two blades, each with a cutting edge, which are movable relative to each other in a cutting configuration of the cutting tool for cutting a material.

[0002] To process these blades with a grinding or polishing tool, the cutting edges must be freely accessible. Maintaining a constant grinding angle between each cutting edge and the grinding or polishing tool is also crucial for precise grinding or polishing. However, due to the moving blades, grinding or polishing the edges of scissors is significantly more complex than grinding or polishing a single, stationary knife edge.

[0003] The present invention is based on the objective of simplifying the grinding or polishing of the cutting edges of a generic cutting tool.

[0004] To solve this problem, the present invention provides the subject matter of claim 1. The present invention discloses a cutting tool, in particular scissors, comprising: two blades, each with an edge, which are movable relative to each other in a cutting configuration of the cutting tool for cutting a material, wherein the cutting tool can be reversibly converted from the cutting configuration into a grinding configuration, in which the blades are used for grinding and / or polishing one or both of the edges with a grinding or polishing tool.Polishing device, in particular with a roller grinder, are separated from each other and can each be placed individually on a flat surface, so that the blade is aligned at a constant working angle to the surface, or in which the blades are locked relative to each other, wherein the cutting tool, preferably each individual blade, has at least one support section that defines a support plane with which the cutting tool or each blade can be placed individually and stably on a flat surface in the grinding configuration such that the blade with the cutting edge to be processed is aligned at a working angle in the range of 10 to 80° to the support plane.

[0005] Scissors, such as garden shears, are known to be locked in a closed, overlapping position for safety reasons. In this position, the blades are closed and close together, relative to each other. In this state, the scissors have a compact configuration and are easy to store. Furthermore, a user cannot injure themselves on the blades when they are closed. However, the blades are not accessible for sharpening or polishing in this position.

[0006] Since the two blades of a pair of scissors are movable relative to each other in the cutting configuration, but the grinding or polishing angle should / must remain constant, the ability to convert the cutting tool into a grinding configuration in which the blades are separated or locked relative to each other and at least one cutting edge is accessible for grinding or polishing is a crucial advantage. This allows the user to concentrate on grinding or polishing the cutting edges because the relative alignment of the blades is ensured by locking them in place, or because each individual blade can be aligned and processed separately. Preferably, each blade can be placed stably on the flat surface. This means that the blade stands independently on the flat surface.For grinding and / or polishing, the blade should still be fixed by hand, as the forces exerted on the blade usually exceed the static friction of the blade on the flat surface.

[0007] In the grinding configuration, the blade being processed can be stabilized, supported, or held in place by the other blade during grinding or polishing, or the blade itself can be placed on a flat surface in a workable state, i.e., the blade forms its own grinding guide. This makes the cutting tool easier to work with in the grinding configuration than in the cutting configuration, where the two blades are movable relative to each other.

[0008] It can be advantageous if the cutting tool, preferably each individual blade, has at least one support section that defines a support plane with which the cutting tool or each individual blade in the grinding configuration can be stably placed on a flat surface, preferably in such a way that at least one of the following requirements is met: The blade with the cutting edge to be machined is oriented at a working angle of 10 to 80°, preferably 25 to 75°, more preferably 30 to 60°, and particularly preferably 40 to 50°, or more specifically 45°, to the support plane. The blades each comprise (i.e., each blade comprises) at least one support section defining the support plane, preferably three support sections, of which preferably at least one of the support sections lies outside the blade plane and / or projects beyond the blade plane to support the blade, at least in the grinding configuration. Particularly preferably, the maximum projection of the support section beyond the blade plane in the grinding configuration is in the range of 20 to 90%, preferably 40 to 70%, of the maximum width of the blade (measured between the cutting edge and the blade spine).The cutting tool comprises at least three support sections defining the support plane, which are not aligned. The cutting edge to be machined extends in a plane oriented at an angle of no more than 10°, preferably no more than 5°, preferably 0°, or parallel to the support plane. The cutting edge to be machined is located at a distance of 5 to 50 mm, preferably 10 to 30 mm, preferably 15 to 25 mm, from the support plane. When projected onto the support plane, the cutting edge to be machined lies completely outside the other blade, starting from a point of intersection with it. A distal section of the blade with the cutting edge to be machined rests on a distal section of the other blade, preferably flush. When projected onto the support plane, the support section lies below the blade and / or does not protrude beyond the blade or cutting edge.

[0009] When these requirements are met, the blade is optimally aligned with the cutting edge to be processed for grinding or polishing with a grinding or polishing tool. Preferably, the cutting tool has at least one separate support section for each cutting edge, defining a separate support surface for that cutting edge.

[0010] It can also prove useful if each blade has a cutting edge at one end and a handle at the other. This makes the cutting tool easy to use, especially in the cutting configuration. Preferably, a support section is located on the handle of each blade. Preferably, another support section is located on the back of each blade, or on the side of the blade facing away from the cutting edge.

[0011] It can also be advantageous if the cutting tool is designed as articulated scissors and the blades in the cutting configuration are arranged crosswise on an axis located between the handle and the cutting edge, and are rotatably mounted relative to each other, such that the handles and the cutting edges of both blades (in pairs) face each other, wherein preferably the cutting tool has at least one support section projecting along the axis according to claim 1, which is in particular designed as part of the axis or is detachably coupled to the cutting tool, wherein preferably the axis for transferring the cutting tool between the cutting configuration and the grinding configuration of at least one of the blades is detachable, so that the blades can be separated from each other and / or locked in another configuration relative to each other, wherein preferably the axis has two detachably coupling parts, in particular a screw bolt and a corresponding cap nut.or wherein the axis is attached to one blade and forms the male part of a bayonet fitting, which is detachably coupled to a female part of the bayonet fitting on the other blade. Jointed scissors are versatile, easy to use, and particularly common in practice. In an advantageous embodiment, each blade comprises a support section on the handle, another support section on the blade spine, and yet another support section extending from the axis. These three support sections preferably form a support plane for stable three-point mounting of the blade in the grinding configuration, especially when the blades are separated from each other in the grinding configuration. The support section extending from the axis forms a kind of "leg" outside the other two support sections, which lie in or near the plane of the blade. It may be advantageous toThe support section, when projected onto the support plane along its axis, does not protrude beyond the cutting edge. This prevents the roller sharpener from colliding with this support section during grinding or polishing of the blade. It can be advantageous if the axial projection of the support section, extending along its axis beyond the blade plane, is in the range of 20 to 90%, preferably 40 to 70%, of the maximum blade width measured between the cutting edge and the blade spine, in both the cutting and grinding configurations. It can be helpful if the support section is flattened at the end facing away from the blade or forms a V-shaped edge. In an advantageous embodiment, the axis is attached to one blade and forms the male part of a bayonet fitting, which is detachably coupled to a female part on the other blade. The axis can, for example, have a "key" at its distal end.which, for example, fits into or can be released from a corresponding "lock" on the other blade in a specific rotational position, e.g., in a position where the blades describe an opening angle of 120 to 180° or 140 to 160° relative to each other. This prevents the blades from being unintentionally separated from each other in the cutting configuration. It can also be advantageous if the cutting tool has a releasable cover for the axis and this cover has at least one support section according to claim 1. Preferably, each of the blades has such a cover, or the cover can be coupled to each of the blades.

[0012] It can also be practical if each of the blades comprises a blade plate with the cutting edge, wherein preferably the blade plate of one blade overlaps and / or contacts the handle of the other blade at least partially in the grinding configuration, wherein preferably each of the handles has a handle opening and the blade plate of one blade at least partially covers the handle opening of the other blade in the grinding configuration (especially when viewed along the axis). With this arrangement, for example, the opening angle of the two cutting edges in the grinding configuration can be maximized. An important aspect of the invention is also to couple the two blades of the cutting tool for grinding and / or polishing in such a way that one blade serves as a stable bearing or as a support for grinding or polishing the other blade or the cutting edge arranged on it.This allows for particularly precise grinding or polishing operations. The support sections are preferably located on the handle, ideally on the side of the handle facing away from the other blade. If the blade of the blade being machined overlaps the handle of the other blade, particularly along its axis or when projected onto the support plane, and / or makes contact, the blade of the blade being machined can be directly supported or rested on the handle of the other blade. This allows the opening angle of the two cutting edges to be further increased in the machining position. In the machining position, the handle openings are generally not required and can therefore be covered by the blade of the other blade to maximize the opening angle of the two cutting edges.If the two blades are connected to a common pivot point, grinding or polishing the cutting edge can cause vibrations in the blade being worked on. Resting the blade of the blade being worked on the handle of the other blade can dampen or even eliminate these vibrations. Ideally, both handles are made of an elastic material (plastic) and / or each has at least one elastic support section (e.g., a silicone pad or a magnet with an elastic coating) on ​​the contact side with the blade of the other blade. This support section can serve both as a bearing for the blade being worked on and as a locking mechanism for the blades in the working position.It is also possible to couple the two blades in a disassembled state, where they are not connected via a common axis of rotation, in such a way that the blade being machined is supported by and rests against the other blade. This allows, in particular, the contact area of ​​the cutting tool—or the area enclosed by the support sections used to define the contact plane—to be increased, thereby improving the stability of the cutting tool in the grinding configuration.

[0013] It can be practical if the blades in the cutting configuration for cutting the material can be reversibly switched between an open position, in which the material can be arranged between the blades, and a closed position, in which the blades lie directly on top of each other. The cutting tool can be switched to the grinding configuration in an open position of the blades, preferably in a maximally open position, by locking the blades in place. This provides the maximum space between the open blades for grinding or polishing. Alternatively, the opening angle of the two blades in the grinding configuration is greater than the opening angle in the maximally open position of the blades in the cutting configuration.This prevents the blades from being unintentionally switched from the cutting configuration to the grinding configuration, or vice versa, because this is undesirable when handling the cutting tool.

[0014] It can be advantageous if the two cutting edges in the grinding configuration have an opening angle in the range of 135° to 180°, preferably in the range of 150° to 180°, particularly with respect to a common axis of rotation of the blades. This makes the cutting edges particularly accessible for grinding or polishing operations, and the grinding or polishing process is especially easy.

[0015] It can be advantageous to have the blades magnetically or mechanically locked in the grinding configuration. A magnetic locking mechanism for the two blades is particularly easy to install and remove, especially without tools. Other locking mechanisms are also possible. A mechanical locking mechanism, for example using a screw, is particularly secure, ensuring it can withstand even considerable force applied to the blades during grinding or polishing.

[0016] It can be advantageous if the blades for transferring the cutting tool from the cutting configuration to the grinding configuration are detachable from one another and can be coupled together in a different arrangement, wherein preferably the blade faces of the blades in the grinding configuration are aligned in different, non-parallel planes, particularly transversely or perpendicularly to each other, preferably such that the blades are arranged in an approximately T-shape. This allows the cutting tool in the grinding configuration to have a particularly stable position on a flat surface for processing with the grinding or polishing tool. Moreover, the cutting edge to be processed is particularly easily accessible in this arrangement.In this design, it can be particularly advantageous if the blades are coupled together in a disassembled state such that the blade to be processed, with its blade face—preferably with the opening that accommodates the common axis of rotation in the cutting configuration of the cutting tool—rests on the handle end or back of the other, non-processing blade and is held there magnetically or mechanically. The blade face of the blade to be processed is oriented at a working angle of ideally 40 to 50° to the support surface or base, such that the cutting edge to be processed faces the support surface or base. The grinding or polishing device can then be moved along the cutting edge to sharpen it by removing or abrading blade material.

[0017] It can be advantageous to lock the blades in the working position by allowing one blade section to be coupled to the handle of the other. Since the handle is typically located at one end of the blade and the blade section at the other, coupling the handle and blade section provides a particularly stable locking mechanism. Furthermore, this reduces the free length of the blades, which are otherwise only connected at their common axis. This helps to dampen vibrations caused by grinding or polishing operations on the blade being worked.

[0018] Another independent aspect of the present invention relates to a method for grinding and / or polishing a cutting tool according to any one of claims 1-9, comprising two blades, each with an edge, wherein the blades are movable relative to each other in a cutting configuration of the cutting tool for cutting a material, the method comprising: Step A: Transferring the cutting tool from the cutting configuration to a grinding configuration in which the blades are separated and can each be placed individually on a flat surface, ensuring that the blade is aligned at a constant working angle to the surface, or in which the blades are locked relative to each other. Step B: Grinding and / or polishing one or both cutting edges in the grinding configuration using a grinding or polishing device, in particular a roller grinder. Step C: Transferring the cutting tool from the grinding configuration to the cutting configuration.

[0019] It can be helpful if, in step B, the blade with the cutting edge to be processed (or the blade to be processed) is supported against the other blade, preferably against the handle of the other blade, and preferably at the end of the other blade furthest from the cutting edge. This gives the cutting tool a particularly stable position in the grinding configuration.

[0020] It can be advantageous if the cutting tool, or at least the blade to be machined, is held stably on a flat surface in step B, so that the blade with the cutting edge to be machined is aligned with the surface at a working angle of 10 to 80°, preferably 15 to 75°, more preferably 30 to 60°, and particularly preferably 40°. This facilitates maintaining a constant working angle during the machining of the cutting edge.

[0021] It can also prove practical if, in step B, the blade of the blade with the cutting edge to be machined is arranged such that the handle of the other blade is located, at least partially, between this blade and the support, with the blade of the blade with the cutting edge to be machined preferably resting on the handle of the other blade, preferably flush against it. This allows the blade of one blade to be stably supported on the handle of the other blade in the grinding configuration.

[0022] It can be advantageous if, in step B, the cutting edge to be processed is held against a grinding or polishing surface of the grinding or polishing device, and the grinding or polishing device is moved along this cutting edge, preferably alternating in a first direction leading towards the handle of the blade and a second direction leading away from the handle of the blade, or repeatedly in one of these two directions. This can achieve a particularly good grinding or polishing result.

[0023] It can also be advantageous if, in step C, both cutting edges are ground or polished using the same blade grinding configuration. This simplifies the grinding and / or polishing of both cutting edges of the cutting tool because the grinding configuration of the cutting tool can be maintained, and only the position of the grinding or polishing device needs to be changed.

[0024] It can be advantageous to exchange the positions of the blades between machining one cutting edge and machining the other, preferably in such a way that the blade not being machined supports the blade being machined. For example, the handle of the blade with the cutting edge not being machined can serve as a support for the blade with the cutting edge being machined.

[0025] Another independent aspect, which is not part of the claimed invention, relates to a set comprising a cutting tool according to one of the preceding embodiments and a grinding guide, with which each of the blades can be arranged on a flat surface in a mounted or dismounted state of the cutting tool such that the blade is aligned at a working angle in the range of 10 to 80°, preferably in the range of 25 to 75°, more preferably in a working angle of 30 to 60°, and particularly preferably in a working angle of 45° to the surface, wherein the grinding guide is preferably fixedly connected to the cutting tool at least in the cutting configuration and / or is adjustable relative to at least one of the blades for the purpose of transferring the grinding guide into the grinding configuration.The grinding guide can in particular be formed at least partially by a support section projecting along the axis according to claim 4 according to claim 1, which, at least in the cutting configuration, projects beyond the blade to be machined in such a way as to define a support plane alone or possibly in conjunction with other support sections, e.g. on the handle and / or spine of the blade to be machined.

[0026] Preferably, this set also includes a grinding and / or polishing device, in particular in the form of a roller grinder as known from EP 3 278 928 B1, wherein this grinding and / or polishing device has at least one grinding or polishing surface which, when the grinding and / or polishing device is rolled on a flat surface, rotates in a plane perpendicular to that surface.

[0027] Document GB-A-1,487,192 discloses a pair of scissors according to the preamble of claim 1.

[0028] Further advantageous developments of the invention result from combinations of the features disclosed in the description, the claims and the figures. Terms and definitions

[0029] The open position is a position of the blades in which the cutting edges of the blades are accessible for grinding and / or polishing, or to arrange material to be cut between the cutting edges.

[0030] A locked state is a state in which the blades are in the grinding configuration and therefore cannot be moved relative to each other.

[0031] Reversible conversion means that the cutting tool can not only be moved from the cutting configuration to the grinding configuration, but also back from the grinding configuration to the cutting configuration. These conversions can preferably be repeated any number of times.

[0032] Stable means that the cutting tool preferably rests on a flat, horizontal surface without tilting and without any separate force being applied, solely by its own weight. Brief description of the characters

[0033] Fig. 1 Figure 1 shows an exemplary cutting tool according to the present invention in the form of a jointed scissors with two blades mounted crosswise on a common axis of rotation in a cutting configuration in a partially open position, wherein the viewing direction runs along or parallel to the axis of rotation. Fig. 2Figure 1 shows another exemplary cutting tool according to the present invention in the form of a jointed scissors with two blades mounted crosswise on a common axis of rotation, wherein the blades are locked in a grinding configuration relative to each other and wherein the blade of the upper blade rests on the handle of the lower blade, while the cutting edge of the upper blade is machined with a schematically depicted roller grinder. Figure 3 shows in schematic side view the in Figure 2The illustrated arrangement shows the cutting edge of the upper blade being processed with a roller sharpener, the blade of the upper blade being aligned at a working angle of 15 or 20° to a flat surface, the handle of the lower blade resting stably on the surface with support sections defining a support plane, thereby supporting the blade of the upper blade, the cutting edge of the upper blade projecting beyond the handle of the lower blade when projected onto the support plane and thus being optimally accessible to the roller sharpener. Figure 4 Figure 1 shows a photographic illustration of a cutting tool according to the invention in the grinding configuration, wherein the blades are locked in a maximally open position relative to each other, wherein a user holds the cutting tool in his hand and indicates the stop for the maximum opening angle of the blades with a pen tip. Figure 5shows a photographic illustration of the cutting tool according to the invention. Fig. 4 in the grinding configuration during grinding operation with a roller grinder. Figure 6 Figure 1 shows a photographic illustration of a cutting tool according to an alternative embodiment of the invention in the grinding configuration, wherein the blades are locked in a decoupled state in a different arrangement relative to each other, wherein the blade to be machined rests with its blade face on the back of the handle of the blade not to be machined and is approximately aligned in a plane perpendicular to the blade face of this blade, wherein the cutting edge to be machined points towards the base and the blade face is aligned at the intended working angle of 40 to 50° to the base. Figure 7 shows an enlarged detail view of the arrangement Fig. 6 . Figure 8Figure 1 shows a computer-generated, schematic top view of a cutting tool according to a further embodiment of the invention, with a view perpendicular to the planes of the blades or the plane of the scissor movement, wherein the cutting tool is designed as articulated scissors and the blades in the cutting configuration are arranged crosswise on an axis located between the handle and the cutting edge and are rotatably mounted relative to each other, such that the handles and the cutting edges of both blades are opposite each other, wherein the cutting tool has a support section projecting along the axis, which, in the grinding configuration, together with further support sections on the handle and on the back of the blade, defines a support plane for placing the blade to be processed on a flat surface. Figure 9 shows a computer-generated, schematic side view of the cutting tool according to Figure 8with a viewing direction parallel to the planes of the blades or parallel to the plane of the scissor movement. Figure 10 a computer-generated, perspective and schematic view of the cutting tool according to Figures 8 and 9 . Figure 11 shows a grinding arrangement with a blade of the cutting tool in a computer-generated, perspective and schematic representation according to the Figures 8 to 10 in the grinding configuration, which is positioned on a flat surface, wherein the blade is detached from the other blade of the cutting tool and is supported on the flat surface by a support section projecting along the pivot axis of the cutting tool, and rests stably on the surface for grinding and / or polishing this blade. Figure 12 shows the arrangement according to Figure 11from a different perspective in combination with a grinding or polishing device in the form of a roller grinder, whereby the cutting edge of the blade to be processed is held in contact with a grinding or polishing surface of the grinding or polishing device. Figure 13 the order according to Figure 12 once again from a different perspective, with the grinding or polishing device in the form of the roller grinder shown semi-transparently. Figure 14 a photographic image of one of the blades of the in the Figures 8 to 10A grinding device schematically depicted in the grinding configuration in combination with a grinding or polishing device in the form of a roller grinder, wherein the blade is detached from the other blade of the cutting tool and is supported on the flat surface by a support section projecting along the pivot axis of the cutting tool and rests stably on the surface for grinding and / or polishing this blade, wherein the cutting edge of the blade to be processed is held by a user, whose hand is partially visible in the photographic illustration, in contact with a grinding or polishing surface of the grinding or polishing device. Figure 15 shows the in Figure 14 Blade shown without a grinding or polishing device from a different perspective. Detailed description of preferred embodiments

[0034] The preferred embodiments of the present invention are described in detail below with reference to the accompanying figures. First embodiment (Figs. 1 to 5): Grinding configuration in the assembled state

[0035] Figure 1 Figure 1 shows a cutting tool 1 according to the first embodiment of the invention, wherein the cutting tool 1 has the shape of scissors 1. The scissors 1 are designed as articulated scissors 1 and have two blades 2, 3, each with a cutting edge 2a, 3a, which are movable relative to each other in a cutting configuration. Each of the blades 2, 3 comprises at one end a blade 2b, 3b with the cutting edge 2a, 3a and at another end a handle 2c, 3c. In the cutting configuration, the blades 2, 3 are arranged crosswise on an axis X located between the handle 2c, 3c and the cutting edge 2a, 3a, and are rotatably mounted relative to each other such that the handles 2c, 3c and the cutting edges 2a, 3a of the blades 2, 3 face each other in pairs, as shown in Figure 1. Fig. 1As shown. To cut a material, the blades 2, 3 in the cutting configuration can be reversibly changed between an open position, in which the material to be cut can be arranged between the cutting edges 2a, 3a, and a closed position, in which the cutting edges 2a, 3a lie directly on top of each other.

[0036] According to the invention, the cutting tool 1 can be reversibly converted from the cutting configuration to a grinding configuration, in which the blades 2, 3 are locked relative to each other for grinding and / or polishing one or both cutting edges 2a, 3a with a grinding or polishing device 5, in particular with a roller sharpener 5. The locking can be achieved, for example, by magnetically or mechanically coupling the blades 2, 3 to each other in their maximally open position, for example, by mechanical or magnetic coupling between the handle 2c, 3c of one blade and the blade 2b, 3b of the other blade 2, 3.

[0037] The grinding configuration here corresponds to a maximum open position of the mutually locked blades 2, 3, whereby the cutting edges 2a, 3a enclose an opening angle β of approximately 165° and are optimally accessible for processing with the grinding or polishing device 5.

[0038] The scissors 1 comprise several support sections 4 on each handle 2c, 3c, which define a support plane AE. This plane allows the cutting tool 1, in its grinding configuration, to be stably placed in a locked position on a flat surface U. In the machining position, the blade 2, 3, with the cutting edge 2a, 3a to be machined, is aligned at a working angle α of, for example, 15° or 20° to the support plane AE. When projected onto the support plane AE (viewing direction P in Fig. 3 The cutting edge 2a, 3a to be machined lies completely outside the other cutting edge 2a, 3a, starting from an intersection point with the other cutting edge 2a, 3a. Ideally, the cutting edge 2a, 3a to be machined extends parallel to the support plane AE or base U at a distance of approximately 20 mm. This ensures optimal accessibility of the cutting edge 2a, 3a for machining with the grinding or polishing device 5.

[0039] In the grinding configuration, the blade 2b, 3b of one blade 2, 3 overlaps the handle 2c, 3c and a handle opening of the other blade 2, 3 when viewed along axis X (viewing direction B in Fig. 3 ) at least in sections.

[0040] An important aspect of the invention is to lock the two blades 2, 3 of the cutting tool 1 in the grinding configuration such that the blade 2, 3 not being processed serves as a stable bearing during grinding and / or polishing of the blade 2, 3 being processed. Although the two blades 2, 3 are movable relative to each other in the cutting configuration, the grinding angle for processing the cutting edges 2a, 3a should remain constant. For this reason, the cutting tool 1 according to the invention can be converted into a grinding configuration in which movement of the two blades 2, 3 is blocked by the locking mechanism, in order to facilitate the grinding and / or polishing of one or both of the cutting edges 2a, 3a.

[0041] In the Fig. 3In the schematically represented grinding configuration, the blade 2, 3 with the cutting edge 2a, 3a to be machined is aligned at a working angle α of 15 or 20° to the base U. The working angle α corresponds to the angle that the blade 2b of the upper blade 2, which is to be machined, forms with the base U. The handle 3c of the lower blade 3, which is not to be machined, serves as a rest and ramp for the upper blade 2, which is to be machined. The cutting tool 1 rests on the base U with its support sections 4 and the resulting support plane AE.

[0042] To machine the cutting edge (3a) of the other blade 3, the cutting tool 1 can be turned over so that the previously bottom blade 3 is on top and the previously top blade 2 with its own support sections 4, which define its own support plane AE, rests on the base U.

[0043] In a method according to the invention for grinding and / or polishing the cutting edges 2a, 3a of this cutting tool 1, the cutting tool 1 is first converted from the cutting configuration to the grinding configuration (step A). ​​In this grinding configuration, the cutting edges 2, 3 are locked relative to each other, so that relative movement of the cutting edges 2, 3 is prevented. Subsequently, the cutting edges 2a, 3a are ground and / or polished in the grinding configuration with a grinding or polishing device 5, in particular with a roller grinder 5 (step B). For this purpose, the cutting tool 1 with the support sections 4 is placed stably on a flat surface U, so that the cutting edge 3 not to be processed, here e.g. its handle 3c, serves as a bearing and ramp for the cutting edge 2 to be processed (cf. Fig. 3 The handle 3c of the blade 3 not to be machined is located section by section between the blade 2b of the blade 2 to be machined and the base U.

[0044] A roller grinder 5, as in Fig. 3 The device, which is shown schematically, comprises a cylindrical body 5c and two grinding or polishing surfaces 5a, 5b arranged on the end faces of the body 5c. These grinding or polishing surfaces 5a, 5b rotate in a plane perpendicular to the flat, horizontal surface U when the roller grinder 5 rolls along it. Such roller grinders 5 are known, for example, from DE 297 03 326 U1 or EP 3 278 928 B1.

[0045] The cutting edge 2a of the cutting tool 1 to be processed is held in the grinding configuration in contact with the rotating grinding or polishing surface 5a, 5b of the grinding / polishing device 5. The grinding / polishing device 5 is repeatedly moved along this cutting edge 2a, e.g., alternately in a first direction leading towards a handle 2c of the blade 2, and a second direction leading away from the handle 2c of this blade 2. Alternatively, the grinding / polishing device 5 can be repeatedly moved along this cutting edge 2a in one of these two directions.

[0046] If, in step B, both cutting edges 2a, 3a are ground or polished in the same grinding configuration of the blades 2, 3, the cutting tool 1 can be reversed between processing one cutting edge 2a and processing the other cutting edge 3a, so that the blade 2, 3 not being processed rests on the support U and supports the blade 2, 3 being processed. After completion of the grinding or polishing operation, the cutting tool 1 is returned from the grinding configuration to the cutting configuration by releasing the locking mechanism of the blades 2, 3 (step C), so that the blades 2, 3 are again movable relative to each other. Second embodiment (Figs. 6 and 7): Grinding configuration in disassembled state

[0047] In a second embodiment, which is described below with reference to the Figs. 6 and 7As described, the blades 2, 3 are detachable from each other and can be coupled together in a different arrangement to transfer the cutting tool 1 from the cutting configuration to the grinding configuration.

[0048] High-quality scissors typically have a sharpening angle of more than 25°, ideally 45°. The handle 2c, 3c of the blades 2, 3 would have to be comparatively thick to create a 45° angle so that the grinding / polishing tool 5 can still be properly positioned and sharpened.

[0049] In the alternative version, the blades 2, 3 of the scissors 1 can therefore be separated at the joint or the axis of rotation X using a special screw. At the end of each handle 2c, 3c of the two blades 2, 3 or scissor jaws, a thread (e.g., insert nut) or a magnet is incorporated at the correct angle, so that the other blade 2, 3 or scissor jaw can be screwed on or clipped onto the magnet in such a way that the correct sharpening angle is automatically created on the cutting edge 2a, 3a.

[0050] The grinding configuration of cutting tool 1 is in Figs. 6 and 7As shown, in the grinding configuration, the blades 2b, 3b of the blades 2, 3 are arranged in an approximately T-shape and aligned in different, non-parallel planes. The blade 2 to be machined is positioned, for example, transversely or perpendicularly to the blade 3 not to be machined, at its handle end 3c, and its blade 2c rests against the handle end 3c of the blade 3 not to be machined. The handle end 3c of the blade 3 not to be machined is designed—as mentioned—to support the blade 2 to be machined and hold it magnetically or mechanically in place, aligning it at a working angle of 45° to the base U, so that the cutting edge 2a to be machined faces the base U. Third embodiment: Grinding configuration with grinding gauge (not shown)

[0051] Alternatively to the one in Figs. 6 and 7In the illustrated embodiment, the cutting tool 1, in its assembled state, or each blade 2, 3 individually in its disassembled state, can be positioned using a grinding guide (not shown) so that the blade 2, 3 to be processed is aligned at the intended working angle of approximately 40 to 50° to the base U. This allows the intended grinding angle to be precisely set relative to the rotating grinding or polishing surface 5a / b of the roller grinder 5, which is oriented perpendicular to the base U. The grinding guide can be an integral part of the cutting tool 1, particularly in the cutting configuration. To convert it to the grinding configuration, the grinding guide can, for example, be detached from at least one of the blades 2, 3 or adjusted relative to at least one of the blades 2, 3. Fourth embodiment (Figs. 9 to 15): Support section along the axis

[0052] The fourth excursion example of the invention is described below with reference to the Figures 8-15described in detail. For identical features, identical reference symbols are used as in the preceding exemplary embodiments, and a further description is omitted.

[0053] The cutting tool 1 according to the fourth embodiment is designed as a hinged scissor and is in the Figs. 8 to 13 in various computer-generated views (CAD) as well as in Figs. 14 and 15 depicted at least in sections in photographic representations.

[0054] The blades 2, 3 of the articulated scissors are arranged in the cutting configuration on an axis X located between the handle 2c, 3c and the cutting edge 2a, 3a in such a way that the handles 2c, 3c and the cutting edges 2a, 3a of both blades 2, 3 are opposite each other.

[0055] In the present case, the axis X is designed, for example, as a screw axis with a screw bolt and cap nut, which are designed as parts 6, 7 projecting along the axis X beyond the blades 2, 3 and can be detached from each other to transfer the cutting tool 1 from the cutting configuration to the grinding configuration. The screw bolt 6 comprises a head and a shaft extending from it with an external thread. The shaft can be screwed into a complementary threaded receptacle of the cap nut 7 with an internal thread. In the connected state or in the cutting configuration, the screw bolt 6 and cap nut 7 project axially on both sides beyond the blades 2, 3 (see figure). Figs. 8 and 9 ).

[0056] In an alternative embodiment (not shown), the blades 2 and 3 are detachably coupled via a bayonet fitting. The axis X forms the male part of the bayonet fitting and is permanently connected to one of the blades 2 and 3. At its distal end, the axis X has an engagement profile—or a "key"—which, in a specific rotational position, fits into or can be released from a receiving profile—or a "lock"—on the other blade, forming the female part of the bayonet fitting. This bayonet fitting can be concealed by caps that form the parts 6 and 7 projecting along the axis X beyond the blades 2 and 3.

[0057] The parts 6, 7 of the cutting tool 1 projecting along the axis X are approximately identical or mirror-symmetrical in shape, in particular tapering wedge-shaped towards the opposing ends. These parts 6, 7 function as a "grinding guide" to support each of the blades 2, 3 in the grinding configuration at a constant working angle α of, for example, 45° to the flat surface U. The shapes of the parts 6, 7 can be selected independently of each other. The wedge shape of the parts 6, 7 is defined by two side flanks, which form flat bearing sections 4 and meet at a vertex 6a. Starting from this vertex 6a, the side flanks are spaced increasingly apart to form a V-shaped edge, which includes a flattened section 6b. Fig. 10 ).

[0058] In the grinding configuration, the two blades 2, 3 are separated from each other.

[0059] The side flank of part 6, which deflects away from the cutting edge 2a of the blade 2, forms a support section 4. This support section, together with other support sections 4, e.g., on the back of the handle 2c and possibly on the back of the blade 2b, defines a support plane AE, which allows the blade 2 to rest against the flat surface U and be held at a constant working angle to the flat surface U. The apex 6a of part 6 points towards the handle 2c of the blade 2.

[0060] Part 6 is preferably rotatable relative to the corresponding blade 2 so that it can self-align until the side flank forming the support section 4 lies exactly in a support plane AE with the other support sections 4 of the blade 2 to be machined. In the desired rotational position, part 6 can preferably be locked relative to the blade 2 so that unintentional rotation relative to the blade 2 is not possible. However, it is also possible that part 6 can only be locked to the blade 2 in the desired orientation, such that the side flank forming the support section 4 lies exactly in a support plane AE with the other support sections 4 of the blade 2 to be machined.

[0061] For grinding or polishing, the cutting edge 2a, 3a of the blade 2, 3 to be processed is held in step B against a grinding or polishing surface 5a, 5b of a grinding or polishing device 5, such as a roller sharpener. The grinding or polishing device 5 is moved along this cutting edge 2a, 3a, preferably alternately in a first direction leading towards the handle 2c, 3c of this blade 2, 3, and a second direction leading away from the handle 2c, 3c of this blade 2, 3, or repeatedly in one of these two directions (see Figure 1). Figs. 12 and 13 ).

[0062] After grinding or polishing of one blade 2, part 6 can be decoupled from that blade 2 and coupled to the other blade 3 in order to support this blade 3 stably on the flat surface U according to the same principle as previously described above. Figs. 8 to 13 was described and with reference to the photographic illustrations in the Figs. 14 and 15is shown.

[0063] In other words, part 6 forms a support section 4 projecting along the axis X to support each of the blades 2, 3 in the grinding configuration in a disassembled state of the cutting tool 1 at a constant working angle α on the base U.

[0064] The scope of protection of the present invention is defined by the attached claims. Reference symbol list

[0065] 1 Cutting tool 2, 3 Blade 2a, 3a Cutting edge 2b, 3b Blade 2c, 3c Handle 4 Support section 5 Grinding or polishing device (roller grinder) 5a, 5b Grinding or polishing surface 5c Device body 6 Part projecting along the axis (bolt) 6a Vertex 6b Flattened section 7 Part projecting along the axis (cap nut) A Support plane B Viewing direction parallel to the axis P Viewing direction perpendicular to the support plane U Support X-axis

Claims

1. A cutting tool (1), in particular scissors, comprising: two blades (2, 3) each having a cutting edge (2a, 3a) and being movable relative to each other in a cutting configuration of the cutting tool (1) for cutting a material, wherein the cutting tool (1) can be reversibly transferred from the cutting configuration into a sharpening configuration in which the blades (2, 3) are separated from each other for sharpening and / or polishing one or both of the cutting edges (2a, 3a) by a sharpening or polishing device (5), in particular with a rolling sharpener (5), and can be individually placed on a level surface (U) so that the blade (2, 3) is aligned at a constant working angle (α) to the level surface (U), or in which the blades (2, 3) are locked relative to each other, characterized in that the cutting tool (1), preferably each individual blade (2a, 3a), has at least one support section (4) which defines a support plane (AE) with which the cutting tool (1) or each blade (2a, 3a) can be stably deposited individually in the sharpening configuration on a level surface (U) such that the blade (2, 3) with the cutting edge (2a, 3a) to be processed is aligned at a working angle (α) in the range of 10 to 80° to the support plane (AE).

2. The cutting tool (1) according to the preceding claim, characterized in that the at least one support section (4) defines the support plane (AE) in such a way that at least one of the following requirements is met: a. The blade (2, 3) with the cutting edge (2a, 3a) to be machined is aligned at a working angle (α) in the range of 25 to 75° to the support plane (AE). b. The blades (2, 3) each comprise at least one support section (4) defining the support plane (AE). c. The cutting tool (1) comprises a total of at least three support sections (4) defining the support plane (AE), which do not lie on a line. d. The cutting edge (2a, 3a) to be machined extends in a plane that is aligned at a maximum angle of 10° to the support plane (AE). e. The cutting edge (2a, 3a) to be machined is spaced between 5 and 50 mm from the support plane (AE). f. When projected onto the support plane (AE), the cutting edge (2a, 3a) to be machined lies completely outside the other blade (2, 3), starting from an intersection point with the other cutting edge (2a, 3a). g. A distal section (2b, 3b) of the blade (2, 3) with the cutting edge (2a, 3a) to be processed rests on a distal section (2c, 3c) of the other blade (2, 3). h. When projected onto the support plane (AE), the support section (4) lies below the blade (2, 3) and / or does not protrude beyond the blade (2, 3) or cutting edge (2a, 3a).

3. The cutting tool (1) according to one of the preceding claims, characterized in that each of the blades (2, 3) has the cutting edge (2a, 3a) at one end thereof and a handle (2c, 3c) at another end thereof.

4. The cutting tool (1) according to the preceding claim, characterized in that the cutting tool (1) is designed as jointed scissors and the blades (2, 3) in the cutting configuration are arranged crosswise on an axis (X) located between the handle (2c, 3c) and the cutting edge (2a, 3a) and are rotatably mounted relative to each other in such a way that the handles (2c, 3c) and the cutting edges (2a, 3a) of both blades (2, 3) face each other.

5. The cutting tool (1) according to one of the two preceding claims, characterized in that each of the blades (2, 3) comprises a blade body (2b, 3b) having the cutting edge (2a, 3a), wherein the blade body (2b, 3b) of one blade (2, 3) overlaps and / or contacts the handle (2c, 3c) of the other blade (2, 3) in the sharpening configuration at least in sections.

6. The cutting tool (1) according to one of the preceding claims, characterized in that the blades (2, 3) in the cutting configuration for cutting the material are reversibly transferable between an open position, in which the material can be arranged between the cutting edges (2a, 3a), and a closed position, in which the cutting edges (2a, 3a) face each other directly, whereby the cutting tool (1) in an open position of the blades (2, 3) can be transferred to the sharpening configuration by locking the blades (2, 3).

7. The cutting tool (1) according to one of the preceding claims, characterized in that the two cutting edges (2a, 3a) in the sharpening configuration enclose an opening angle (β) in the range from 135° to 180°, in particular with respect to a common rotational axis (X) of the blades (2, 3).

8. The cutting tool (1) according to one of the preceding claims, characterized in that the blades (2, 3) are locked magnetically or mechanically in the sharpening configuration.

9. The cutting tool (1) according to one of the preceding claims, characterized in that the blades (2, 3) can be detached from each other and coupled together in a different arrangement for transferring the cutting tool (1) from the cutting configuration to the sharpening configuration.

10. A method for sharpening and / or polishing a cutting tool (1) according to one of the preceding claims and comprising two blades (2, 3) each having a cutting edge (2a, 3a), wherein the blades (2, 3) are movable relative to each other in a cutting configuration of the cutting tool (1) for cutting a material, the method comprising: a. Step A: transferring the cutting tool (1) from the cutting configuration to a sharpening configuration in which the blades (2, 3) are separated from each other and can each be placed individually on a level surface (U) so that the blade (2, 3) is aligned at a constant working angle (α) to the surface (U), or in which the blades (2, 3) are locked relative to each other. b. Step B: Sharpening and / or polishing one or both of the cutting edges (2a, 3a) in the sharpening configuration using a sharpening or polishing device (5), in particular a rolling sharpener (5). c. Step C: Transferring the cutting tool (1) from the sharpening configuration to the cutting configuration.

11. The method according to the preceding claim, characterized in that the blade (2, 3) with the cutting edge (2a, 3a) to be machined is supported in step B on the other blade (2, 3), preferably on the handle (2c, 3c) of the other blade (2, 3), preferably at the end of the other blade (2, 3) facing away from the cutting edge (2a, 3a).

12. The method according to one of the two preceding claims, characterized in that the cutting tool (1) or at least the blade (2a, 3a) to be machined is held in a stable manner on a level surface (U) in step B, so that the blade (2, 3) with the cutting edge (2a, 3a) to be machined is aligned at a working angle (α) in the range of 10 to 80° to the surface (U).

13. The method according to one of the three preceding claims, characterized in that the cutting edge (2a, 3a) to be machined is held in step B in a contiguous contact with a sharpening or polishing surface (5a, 5b) of the sharpening or polishing device (5), and the sharpening or polishing device (5) is moved along this cutting edge (2a, 3a) in the process, preferably alternately in a first direction leading toward the handle (2c, 3c) of this blade (2, 3) and a second direction leading away from the handle (2c, 3c) of this blade (2, 3), or constantly repeated in one of these two directions.

14. The method according to one of the four preceding claims, characterized in that the positions of the blades (2, 3) are exchanged between the machining of one cutting edge (2a) and the machining of the other cutting edge (3a), preferably in such a way that the blade (2, 3) not to be machined supports the blade (2, 3) to be machined.

15. A set comprising a cutting tool (1) according to one of the claims 1 to 9 and a sharpening jig with which each of the blades (2, 3) can be arranged on a level surface (U) in an assembled or disassembled state of the cutting tool (1) in such a way that the blade (2, 3) is aligned at a working angle (α) in the range from 10 to 80°, preferably in the range from 25 to 75°, preferably at a working angle (α) of 30 to 60°, particularly preferably at a working angle (α) of 45° to the surface (U), wherein the sharpening jig is preferably fixedly connected to the cutting tool at least in the cutting configuration and / or is adjustable relative to at least one of the blades in order to transfer the sharpening jig into the sharpening configuration.