Scissors that can be transferred between a cutting configuration and a sharpening configuration

Abstract

This invention relates to a cutting tool (1), particularly scissors, comprising: two blades (2, 3), each having a cutting edge (2a, 3a), which are movable relative to each other in a cutting configuration for shearing material. To simplify the grinding and / or polishing of the cutting edges (2a, 3a) of such a cutting tool (1), according to the invention, the cutting tool (1) can be reversibly transferred from a cutting configuration to a grinding configuration, in which the blades (2, 3) are separated from each other to grind and / or polish one or both of the two cutting edges (2a, 3a) by means of a grinding or polishing device (5), particularly by means of a tumbler grinder (5), and can be individually arranged on a flat base (U) such that the blades (2, 3) are aligned with the base (U) at a constant working angle (a), or the blades (2, 3) are locked relative to each other in the grinding configuration. The invention also relates to a method for grinding and / or polishing the cutting edges (2a, 3a) of such a cutting tool (1).

Description

Technical Field

[0001] The present invention relates to a cutting tool, particularly scissors, comprising: two blades, each having a cutting edge, the blades being movable relative to each other in a cutting configuration for shearing material. Background Technology

[0002] In order to process the blades using grinding or polishing equipment, the cutting edge of the blades must be freely accessible. Furthermore, for precise grinding or polishing, maintaining a constant grinding angle between each cutting edge to be processed and the grinding or polishing equipment is crucial. However, because the blades can move relative to each other, grinding or polishing the cutting edge of scissors is far more complex than grinding or polishing the cutting edge of a single, immovable knife. Summary of the Invention

[0003] The purpose of this invention is to simplify the grinding or polishing of the cutting edge of such a cutting tool.

[0004] To achieve the stated objective, the present invention provides the subject matter of claim 1. The present invention discloses a cutting tool, particularly scissors, comprising: two blades, each having a cutting edge, the blades being movable relative to each other in a cutting configuration for shearing material, wherein the cutting tool can reversibly transfer from the cutting configuration to a grinding configuration, in which the blades are separated from each other to grind and / or polish one or both of the two cutting edges by means of a grinding or polishing device, particularly by means of a tumbler grinder, and can be individually and separately arranged on a planar base such that the blades are aligned with the base at a constant working angle, or in the grinding configuration the blades can be locked relative to each other.

[0005] For safety reasons, scissors that can be locked relative to each other in an unused position, such as garden shears, are known, in which the two cutting blades are closed and stacked on top of each other in the unused position. In this state, the scissors have a compact configuration and can be neatly retracted. Furthermore, with the blades in the closed position, the user will not be injured by the cutting blades. However, in this state, the cutting blades cannot be sharpened or polished.

[0006] However, since the two blades of the scissors can move relative to each other in a cutting configuration, and the grinding or polishing angle should / must remain constant, the transferability of the cutting blade to a grinding configuration is a decisive advantage in the grinding or polishing of the cutting edge, in which the blades are separated from or locked to each other and at least one cutting edge is available for grinding or polishing. Therefore, the user can focus on grinding or polishing the cutting edge, as the relative alignment of the blades is ensured by locking the blades, or each individual blade can be individually aligned and processed. Preferably, each blade can be stably mounted on a flat base. This means that the blade stands independently on the flat base. For grinding and / or polishing, the blade should still be held in place by hand, as the force applied to the blade generally exceeds the static friction of the blade on the flat base.

[0007] In a grinding configuration, the cutting tool can be stabilized, supported, or held in place by another cutting tool during grinding or polishing, or the cutting tool itself can be positioned on a flat base in a machinable state, i.e., the cutting tool forms its own grinding caliper. Thus, the cutting tool is generally easier to machine in a grinding configuration than in a cutting configuration where the two cutting tools can move relative to each other.

[0008] It would be meaningful that the cutting tool, preferably each individual blade, has at least one support section defining a support plane, by means of which the cutting tool or each blade can be stably positioned individually on the flat base in the grinding configuration, preferably such that at least one of the following requirements is met:

[0009] The blade with the cutting edge to be processed is aligned with the support plane at a working angle in the range of 10 to 80°, preferably in the range of 25 to 75°, preferably in the range of 30 to 60°, particularly preferably in the range of 40 to 50°, especially in the range of 45°.

[0010] Each blade includes (i.e., each blade includes) at least one support segment defining a support plane, preferably each blade includes three support segments, preferably at least one of the support segments is located outside the blade plane and / or to support the blade at least in the grinding configuration protruding beyond the blade plane, wherein particularly preferably in the grinding configuration the maximum protrusion of the support segment beyond the blade plane 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 back of the blade).

[0011] The cutting tool includes at least three support sections defining support planes, which are not located on a single line. The cutting edge to be processed extends in a plane that is aligned with or parallel to the support plane at an angle of at most 10°, preferably at most 5°, preferably 0°.

[0012] The cutting edge to be processed has a distance from the support plane ranging from 5 to 50 mm, preferably from 10 to 30 mm, and preferably from 15 to 25 mm.

[0013] When projected onto the support plane, the cutting edge to be processed begins to intersect with another cutting edge completely outside the other blade. The distal end section of the blade with the cutting edge to be processed is positioned on the distal end section of the other blade, preferably planarly positioned on the distal end section of the other blade.

[0014] When projected onto the support plane, the support section is located below the blade and / or does not protrude from the blade or cutting edge.

[0015] When these requirements are met, the blade and the cutting edge to be processed are optimally aligned for grinding or polishing using grinding or polishing equipment. Preferably, the cutting tool has at least one support section for each cutting edge, the support section defining its own support plane for the cutting edge.

[0016] It also proves useful that each blade has a cutting edge at one end and a handle at the other end. This facilitates easy operation of the cutting tool, especially in cutting configurations. Preferably, a support section is located at the handle of each blade. Preferably, another support section is located on the back of each blade or on the side of the blade opposite to the cutting edge.

[0017] It is also advantageous that the cutting tool is configured as a hinged scissor, with the blades arranged crosswise in the cutting configuration on axes respectively arranged between the handle and the cutting edge, and rotatably supported on each other, such that the handles and cutting edges of the two blades are respectively (in pairs) opposite each other. Preferably, the cutting tool has at least one support section protruding along the axis according to claim 2, said support section being specifically configured as part of the axis or detachably coupled to the cutting tool. Preferably, the axis can be detached from at least one of the blades for transferring the cutting tool between the cutting configuration and the grinding configuration, such that the blades can be separated from each other and / or locked relative to each other in different configurations. Preferably, the axis has two detachably coupled components, particularly a bolt and a matching cap nut, or wherein the axis is fixed at one blade and forms a male component of a bayonet lock, said male component being detachably coupled to a female component of a bayonet lock at the other blade. Hinged scissors are versatile, easy to operate, and particularly common in practice. In an advantageous embodiment, each blade includes a support section at the handle, another support section at the blade back, and yet another support section in the axial extension. These three support sections preferably form a support plane for stable three-point support of the blade in the grinding configuration, especially when the blades are separated from each other in the grinding configuration. Here, the support section in the axial extension forms a "leg" in addition to the other two support sections, which is located in or near the blade plane. It is important that the support section in the axial extension does not protrude beyond the cutting edge when projected onto the support plane. This prevents the tumbler from abutting against the support section when grinding or polishing the blade. It is advantageous that, in the cutting and / or grinding configurations, the axial extension of the support section in the axial extension beyond the blade plane is within 20% to 90%, preferably 40% to 70%, of the maximum blade width, measured between the cutting edge and the blade back. It is also helpful that the support section at the end opposite the blade is flattened or forms a V-edge. In an advantageous embodiment, the axis is fixed at one blade and forms a male component that acts as a bayonet lock, the male component being detachably coupled to a female component at another blade. Here, the axis may have a "key" at its distal end, which, for example, engages with or can disengage from a corresponding "lock" at the other blade in a specific rotational orientation, for example, where the blades are positioned at an angle between each other in the range of 120 to 180° or 140 to 160°. This prevents the blades from unintentionally separating from each other in the cutting configuration. However, it is also advantageous for the cutting tool to have a detachable cover for the axis, and the cover having at least one support section according to claim 2. Preferably, each blade has such a cover, or the cover may be coupled to each blade.

[0018] However, it is also feasible for each blade to include a blade with a cutting edge, wherein preferably, the blade of one blade overlaps and / or contacts the handle of the other blade in the grinding configuration, wherein preferably each handle has a handle opening, and the blade of one blade at least partially covers the handle opening of the other blade in the grinding configuration (especially in the viewing direction along the axis). In such an arrangement, for example, the angle between the two cutting edges in the grinding configuration can be maximized. However, an important idea of ​​the invention is that the two blades of the cutting tool are coupled to each other for grinding and / or polishing, such that one blade acts as a stable support or as a support for grinding or polishing the other blade or the cutting edge disposed thereon. This allows for particularly precise grinding or polishing. The support section is preferably located at the handle, preferably on the side of the handle opposite to the corresponding other blade. If the blade of the blade to be processed overlaps with the handle of the other blade, especially in the axial direction or in the projection of the support plane, and / or contacts, the blade of the blade to be processed can be directly supported or placed on the handle of the other blade. Therefore, the angle between the two cutting edges can be further increased in the machining posture. In the machining posture, a handle opening is typically not required, and can be covered by the blade of the other blade to maximize the angle between the two cutting edges. If the two blades are connected at a common axis of rotation, grinding or polishing the cutting edge to be machined will cause vibration at the blade to be machined. By arranging the blade of the blade to be machined on the handle of the other blade, the vibration can be reduced or even suppressed. 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 magnet with an elastic coating) on ​​the contact side with the blade of the other blade. The support section serves both as a support for the blade to be machined and as a locking device for the blade in the machining posture. It is also feasible to couple the two blades together in a disassembled state (in which the blades are not connected via a common axis of rotation), such that the blade to be machined is supported on the other blade and itself is supported on the blade. In particular, this can increase the footprint of the cutting tool—or the area surrounded by the support section used to define the support plane—in order to improve the stability of the cutting tool in the grinding configuration.

[0019] It is feasible for the blade to reversibly transfer between an open and a closed position in a cutting configuration to shear material, in which the material can be arranged between the cutting edges, and in which the cutting edges are directly stacked one on top of the other in the closed position. The cutting tool can be transferred to a grinding configuration by locking the blade in the open position, preferably in the maximum open position. Thus, the maximum space between the open cutting edges can be used for grinding or polishing. Alternatively, the angle between the two cutting edges in the grinding configuration is greater than the angle between the blades in the maximum open position in the cutting configuration. This prevents the blade from unintentionally transferring from the cutting configuration to the grinding configuration, or vice versa, as this is undesirable when operating the cutting tool.

[0020] Advantageously, the two cutting edges form an angle between 135° and 180°, preferably between 150° and 180°, in the grinding configuration, particularly relative to the common axis of rotation of the blades. This allows the cutting edges to be accessed very well for grinding or polishing, and makes grinding or polishing particularly easy.

[0021] It is evident that the cutting blades are magnetically or mechanically locked in the grinding configuration. Magnetic locking of two cutting blades can be established and disengaged particularly easily, especially without tools. Other locking mechanisms are also feasible. Mechanical locking, such as that using screws, is particularly robust, allowing it to withstand significant forces acting on the cutting blades during grinding or polishing.

[0022] It is useful that the blades can be disengaged from each other and coupled in different arrangements to transfer the cutting tool from the cutting configuration to the grinding configuration, wherein preferably the blade blades are aligned in different, non-parallel planes in the grinding configuration, especially laterally or perpendicularly, preferably arranged in an approximately T-shape. Thus, the cutting tool can have a particularly stable base on a flat base in the grinding configuration for machining with the grinding or polishing tool. Furthermore, in this arrangement, the cutting edge to be machined is particularly easily accessible. In the described embodiment, it is particularly advantageous that the blades are coupled to each other in a disassembled state such that the blade to be machined, along with its blade blades, preferably with an opening, is positioned on the handle end or back of the handle of the other blade not to be machined and held there magnetically or mechanically, wherein the opening accommodates a common axis of rotation in the cutting configuration of the cutting tool. Here, the blade blades of the blade to be machined are ideally aligned at a working angle of 40 to 50° relative to the support plane or base, such that the cutting edge to be machined points towards the support plane or base. Then, the grinding or polishing equipment can move along the cutting edge to be processed in order to sharpen the cutting edge by peeling or grinding the blade material.

[0023] What is useful is that, in order to lock the cutting tool in the machining position, the blade of one cutting tool can be coupled to the handle of another cutting tool. Since the handle is usually located at one end of the cutting tool and the blade at the other end, the coupling of the handle and the blade allows for a particularly stable locking of the cutting tool in the machining position. Furthermore, the free length of the cutting tool is reduced, whereas otherwise the cutting tools would only be connected at a common axis. This allows vibrations caused by grinding or polishing to be attenuated at the cutting tool being machined.

[0024] Another independent aspect of the invention relates to a method for grinding and / or polishing a cutting tool, particularly a cutting tool according to one of the foregoing embodiments, the cutting tool having two blades, each blade having a cutting edge, wherein the blades are movable relative to each other in a cutting configuration of the cutting tool for shearing material, wherein the method comprises:

[0025] Step A: Transfer the cutting tool from the cutting configuration to the grinding configuration, in which the blades are separated from each other and can be individually arranged on the flat base, such that the blades are aligned with the base at a constant working angle, or in the grinding configuration the blades can be locked relative to each other.

[0026] Step B: In the grinding configuration, one or both of the two cutting edges are ground and / or polished using grinding or polishing equipment, especially using a tumbler grinder.

[0027] Step C: Transfer the cutting tool from the grinding configuration to the cutting configuration.

[0028] It will prove helpful that in step B, the blade with the cutting edge to be processed (or the blade to be processed) is supported on another blade, preferably on the handle of the other blade, and more preferably on the end of the other blade away from the cutting edge. Thus, the cutting tool has a particularly stable foundation in the grinding configuration.

[0029] It is meaningful that in step B, the cutting tool or at least the blade to be processed is stably held on the flat base such that the blade with the cutting edge to be processed is aligned with the base at a working angle in the range of 10 to 80°, preferably in the range of 15 to 75°, preferably in the range of 30 to 60°, particularly preferably in the range of 40 to 40°, and especially 45°. This simplifies maintaining a constant working angle during the processing of the cutting edge to be processed.

[0030] It will also prove feasible that, in step B, the blade of the cutting edge to be processed is arranged such that the handle of the other blade is at least partially located between the blade and the base, wherein preferably the blade of the cutting edge to be processed is placed on the handle of the other blade, preferably planarly thereon. Thus, the blade of this blade can be stably supported on the handle of the other blade in the grinding configuration.

[0031] Advantageously, in step B, the cutting edge to be processed remains in contact with the grinding or polishing surface of the grinding or polishing equipment, and the grinding or polishing equipment moves along the cutting edge, preferably alternately along a first direction guided towards the handle of the blade and a second direction guided away from the handle of the blade, or always repeatedly moving along one of these two directions. This allows for particularly good grinding or polishing results.

[0032] Another useful feature is that in step C, both cutting edges are ground or polished in the same grinding configuration of the blade. This simplifies the grinding and / or polishing of the two cutting edges of the cutting tool, as the grinding configuration of the cutting tool can be maintained and only the position of the grinding or polishing equipment needs to be changed.

[0033] It is advantageous to exchange the positions of the blades between machining one cutting edge and machining another, preferably such that the non-machined blades support the machined blades respectively. Thus, for example, the handle of the blade with the non-machined cutting edge can be used as a support for the blade with the machined cutting edge.

[0034] Another independent aspect of the invention relates to a kit comprising a cutting tool according to one of the foregoing embodiments and a grinding caliper, each blade being arranged on a flat base in an assembled or detached state of the cutting tool by means of the grinding caliper, such that the blade is aligned with the base at a working angle in the range of 10 to 80°, preferably in the range of 25 to 75°, preferably in the range of 30 to 60°, and particularly preferably in the range of 45°, wherein preferably the grinding caliper is fixedly connected to the cutting tool at least in the cutting configuration and / or adjustable relative to at least one of the blades to transfer the grinding caliper into the grinding configuration. In particular, the grinding caliper may be formed at least partially by a support section according to claim 2 projecting along the axis of claim 4, the support section projecting at least in the cutting configuration beyond the blade to be processed, so as to define a support plane individually or, if necessary, in conjunction with other support sections, such as the handle of the blade to be processed and / or a support section at the back of the blade.

[0035] Preferably, the kit further includes a grinding and / or polishing device, particularly a grinding and / or polishing device of a design known, for example, from a roller grinder as described in EP 3 278 928 B1, wherein the grinding and / or polishing device has at least one grinding or polishing surface that rotates in a plane perpendicular to the plane aligned with the base as the grinding and / or polishing device rolls on the flat base.

[0036] Other advantageous improvements of the invention can be derived from a combination of features disclosed in the specification, claims and drawings.

[0037] Terms and Definitions

[0038] An open position is the following position of the blade: in which the cutting edge of the blade is accessible for grinding and / or polishing or for arranging the material to be cut between the cutting edges.

[0039] The locked state is as follows: the blades are in the grinding configuration and therefore cannot move relative to each other.

[0040] The ability to reversibly transfer means that the cutting tool can not only be transferred from the cutting configuration to the grinding configuration, but also return from the grinding configuration to the cutting configuration. This transfer can preferably be repeated arbitrarily frequently.

[0041] Stability means that the cutting tool is preferably placed on a flat, horizontal base without tilting and without any individual force acting on it, solely by its own weight. Attached Figure Description

[0042] Figure 1 An exemplary cutting tool according to the invention is shown, which is in the form of articulated scissors having two blades cross-supported on a common axis of rotation in a partially open position in a cutting configuration, wherein the viewing direction extends along or parallel to the axis of rotation.

[0043] Figure 2 Another exemplary cutting tool according to the invention is shown, which is in the form of articulated scissors having two blades cross-supported on a common axis of rotation, wherein the blades are locked relative to each other in a grinding configuration, and wherein the blade of the upper blade is disposed on the handle of the lower blade, and the cutting edge of the upper blade is processed by means of a drum grinder schematically shown.

[0044] Figure 3 Show Figure 2The schematic side view of the arrangement shown indicates that the cutting edge of the upper blade is machined by means of a tumbler grinder, wherein the blade of the upper blade is aligned at a working angle of 15 or 20° with respect to the flat base, wherein the handle of the lower blade with a support section is stably mounted on the base and supports the blade of the upper blade thereon, the support section defining a support plane, wherein the cutting edge of the upper blade protrudes beyond the handle of the lower blade in the projection of the support plane, thereby allowing optimal access for the tumbler grinder.

[0045] Figure 4 A photographic illustration of a cutting tool according to the invention in a grinding configuration is shown, wherein the blades are locked relative to each other in a maximum open position, and the user holds the cutting tool in his hand with a stop portion indicating the maximum angle of the blades by a pin tip.

[0046] Figure 5 This illustrates the grinding configuration during grinding using a tumbler grinder. Figure 4 A photographic illustration of the cutting tool according to the present invention.

[0047] Figure 6 A photographic illustration of a cutting tool according to an alternative embodiment of the invention in a grinding configuration is shown, wherein the blades are locked relative to each other in a different arrangement in a decoupled state, wherein the blade to be processed is supported by its blade blade on the back of the handle of the non-blade and is approximately aligned in a plane perpendicular to the blade blade, wherein the cutting edge to be processed points towards the base, and the blade blade is aligned with the base at a predetermined working angle of 40 to 50°.

[0048] Figure 7 Show Figure 6 Enlarged detail of the layout.

[0049] Figure 8 A computer-generated schematic top view of a cutting tool according to another embodiment of the invention is shown in a viewing direction perpendicular to the plane of the blade or the plane of shearing movement, wherein the cutting tool is configured as an articulated scissor, and the blades are arranged crosswise in a cutting configuration on axes respectively arranged between the handle and the cutting edge and are rotatably supported relative to each other, such that the handles and cutting edges of the two blades are respectively opposite each other, wherein the cutting tool has a support section projecting along the axis, which, together with additional support sections at the handle and back of the blade in a grinding configuration, defines a support plane for placing the blade to be processed on a planar base.

[0050] Figure 9 The view is shown in the direction of observation, parallel to the plane of the blade or parallel to the plane of shearing movement. Figure 8 A computer-generated schematic side view of the cutting tool.

[0051] Figure 10 Showing according to Figure 8 and Figure 9 A computer-generated 3D schematic diagram of the cutting tool.

[0052] Figure 11 The diagram shows the basis for the grinding configuration. Figures 8 to 10 A computer-generated three-dimensional schematic diagram of the shearing arrangement of the blades of a cutting tool, the blades being positioned on a planar base, wherein the blades are disengaged from another blade of the shearing tool and supported on the planar base by a support section protruding along the hinge axis of the cutting tool, and are stably mounted on the base for grinding and / or polishing the blades.

[0053] Figure 12 This is shown from another perspective. Figure 11 The arrangement is combined with a grinding or polishing device in the form of a drum grinder, wherein the cutting edge of the blade to be processed remains in contact with the grinding or polishing surface of the grinding or polishing device.

[0054] Figure 13 Again, showing the basis from different perspectives Figure 12 The arrangement shows a semi-transparent grinding or polishing device in the form of a roller grinder.

[0055] Figure 14 Showing the configuration in the polishing stage Figures 8 to 10 The photographic illustration shows one of the blades of a grinding device combined with a grinding or polishing device in the form of a tumbler grinder. The blade of the cutting tool is disengaged from another blade and supported on a flat base by a support section protruding along the hinge axis of the cutting tool. The blade is stably positioned on the base for grinding and / or polishing. The cutting edge of the blade to be processed is held against the grinding or polishing surface of the grinding or polishing device by a user whose hand is partially visible in the photographic illustration.

[0056] Figure 15 Showing from different perspectives Figure 14 The blade shown is without a grinding or polishing device. Detailed Implementation

[0057] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0058] First embodiment ( Figures 1 to 5 ): Polishing configuration in the assembled state

[0059] Figure 1A cutting tool 1 according to a first embodiment of the present invention is shown, wherein the cutting tool 1 has the shape of scissors 1. The scissors 1 are configured as hinged scissors 1 and have two blades 2, 3, each having a cutting edge 2a, 3a, which are movable relative to each other in a cutting configuration. Each blade 2, 3 includes a blade blade 2b, 3b with the cutting edge 2a, 3a at one end and a handle 2c, 3c at the other end. In the cutting configuration, the blades 2, 3 are arranged crosswise on an axis X respectively arranged between the handles 2c, 3c and the cutting edges 2a, 3a and are rotatably supported relative to each other, such that the handles 2c, 3c and the cutting edges 2a, 3a of the blades 2, 3 are respectively paired and opposite to each other, as shown. Figure 1 As shown. In order to cut the material, blades 2 and 3 can reversibly transfer between an open posture and a closed posture in the cutting configuration. In the open posture, the material to be cut can be arranged between the cutting blades 2a and 3a, and in the closed posture, the cutting blades 2a and 3a are directly stacked on top of each other.

[0060] According to the invention, the cutting tool 1 can be reversibly transferred from a cutting configuration to a grinding configuration, in which the blades 2 and 3 are locked relative to each other to grind and / or polish one or both of the cutting edges 2a and 3a by means of a grinding or polishing device 5, particularly by means of a tumbler grinder 5. Locking can be achieved, for example, by magnetically or mechanically coupling the blades 2 and 3 to each other in their maximum open position, for example by mechanical or magnetic coupling between the handle 2c or 3c of one blade and the blade blade 2b or 3b of the other blade 2 or 3.

[0061] Here, the grinding configuration corresponds to the maximum open position of the mutually locked blades 2 and 3, where the cutting edges 2a and 3a form an angle β of approximately 165°, and are optimally accessible for processing by means of the grinding or polishing equipment 5.

[0062] The scissors 1 include multiple support segments 4 at each handle 2c, 3c, which define a support plane AE. The cutting blade 1 can be stably mounted on the planar base U in a locked state with respect to the support plane in a grinding configuration. In the machining posture, the blades 2, 3 are aligned with the cutting edges 2a, 3a to be machined relative to the support plane AE at a working angle α, for example, within the range of 15 or 20°. (The last sentence appears to be incomplete and possibly refers to a different context.) Figure 3 When viewed from the direction P), the cutting edges 2a and 3a to be processed begin to intersect with the other cutting edge 2a and 3a completely outside the other blade 2 and 3. Ideally, the cutting edges 2a and 3a to be processed extend parallel to the support plane AE or the base U at a spacing of approximately 20 mm. Therefore, the cutting edges 2a and 3a to be processed can be optimally reached for processing using the grinding or polishing equipment 5.

[0063] In the polishing configuration, along the axis X ( Figure 3 In the observation direction B), when observing, the blades 2b and 3b of one blade 2 and 3 are at least partially superimposed on the handles 2c and 3c and the handle opening of the other blade 2 and 3.

[0064] A key idea of ​​this invention is that the two blades 2 and 3 of the cutting tool 1 are locked in a grinding configuration, such that the non-processing blades 2 and 3 serve as stable supports while grinding and / or polishing the blades 2 and 3 to be processed. Although the two blades 2 and 3 can move relative to each other in the cutting configuration, the grinding angle used to process the cutting edges 2a and 3a should remain constant. For this reason, the cutting tool 1 according to the invention can be transferred to a grinding configuration in which movement of the two blades 2 and 3 is prevented by locking, thereby simplifying the grinding and / or polishing of one or both cutting edges 2a and 3a.

[0065] exist Figure 3 In the schematically illustrated grinding configuration, blades 2 and 3 are aligned with the cutting edges 2a and 3a to be processed relative to the base U at a working angle α of 15 or 20°. The working angle α corresponds to the angle formed by the blade blade 2b of the upper blade 2 to be processed relative to the base U. Here, the handle 3c of the lower blade 3 (not to be processed) serves as a support and bevel for the upper blade 2 to be processed. Here, the cutting tool 1 is mounted on the base U by the support section 4 or the support plane AE formed therefrom.

[0066] In order to process the cutting edge (3a) of another blade 3, the cutting tool 1 can be flipped so that the previous lower blade 3 is on top and the previous upper blade 2 is placed on the base U with its own support section 4, which defines its own support plane AE.

[0067] In the method according to the invention for grinding and / or polishing the cutting edges 2a, 3a of the cutting tool 1, the cutting tool 1 is first transferred from a cutting configuration to a grinding configuration (step A). ​​In the grinding configuration, the blades 2, 3 are locked relative to each other, so that relative movement of the blades 2, 3 is prevented. Subsequently, in the grinding configuration, the cutting edges 2a, 3a are ground and / or polished by means of a grinding or polishing device 5, particularly by means of a tumbler grinder 5 (step B). For this purpose, the cutting tool 1 is stably arranged on the flat base U by means of the support section 4, such that the non-processed blade 3, for example its handle 3c, serves as a support and bevel for the processed blade 2 (see...). Figure 3 Here, the handle 3c of the non-processed blade 3 is located between the blade blade 2b of the blade 2 to be processed and the base U.

[0068] like Figure 3The drum polisher 5 schematically shown includes a cylindrical device body 5c and two polishing or grinding surfaces 5a, 5b arranged at the end sides of the device body 5c. As the drum polisher 5 rolls on a horizontal, planar base U, the polishing or grinding surfaces 5a, 5b rotate in a plane perpendicularly aligned with it. Such drum polishers 5 are known, for example, from DE297 03 326U1 or EP 3 278 928 B1.

[0069] In the grinding configuration, the cutting edge 2a of the cutting tool 1 remains abutted against the rotating grinding or polishing surfaces 5a, 5b of the grinding / polishing device 5. Here, the grinding / polishing device 5 repeatedly moves along the cutting edge 2a, for example, alternately moving in a first direction guided towards the handle 2c of the blade 2 and a second direction guided away from the handle 2c of the blade 2. Alternatively, the grinding / polishing device 5 may always repeatedly move along the cutting edge 2a in one of these two directions.

[0070] If, in step B, the two cutting edges 2a and 3a are ground or polished in the same grinding configuration of the blades 2 and 3, the cutting tool 1 can be flipped between processing one cutting edge 2a and processing the other cutting edge 3a, so that the blades 2 and 3 not to be processed are respectively placed on the base U and support the blades 2 and 3 to be processed. After the grinding or polishing process is completed, by releasing the locking of the blades 2 and 3, the cutting tool 1 is transferred back from the grinding configuration to the cutting configuration (step C), so that the blades 2 and 3 can move relative to each other again.

[0071] Second embodiment ( Figure 6 and Figure 7 ): Grinding configuration in disassembled state

[0072] Refer to the following Figure 6 and 7 In the second embodiment described, blades 2 and 3 can be disengaged from each other to transfer the cutting tool 1 from the cutting configuration to the grinding configuration, and can be coupled to each other in different arrangements.

[0073] High-quality scissors typically have a grinding angle greater than 25°, ideally 45°. The handles 2c and 3c of blades 2 and 3 must be made relatively thick to create a 45° bevel, allowing the grinding / polishing device 5 to still be well-fitted and ground.

[0074] In an alternative implementation, the blades 2 and 3 of the scissors 1 can therefore be separated at the hinge or at the axis of rotation X via special screws. At the end of each handle 2c, 3c of the two blades 2, 3 or the scissor claws, threads (e.g., embedded nuts) or magnets are added at the correct angular position so that the other blade 2, 3 or the scissor claws can be tightened or clamped via the magnets, thereby automatically forming the correct grinding angle at the cutting edges 2a, 3a.

[0075] The grinding configuration of cutting tool 1 is in Figure 6 and 7 As shown in the diagram. Here, in the grinding configuration, the blades 2b and 3b of the blades 2 and 3 are arranged approximately in a T-shape and aligned in different non-parallel planes. Here, the blade 2 to be processed is arranged, for example, transversely or perpendicularly to the blade 3 not to be processed, at its handle end 3c, and is supported by its blade 2c at the handle end 3c of the blade 3 not to be processed. The handle end 3c of the blade 3 not to be processed—as mentioned—is configured to support and magnetically or mechanically hold the blade 2 to be processed so that it is aligned with the base U at a working angle of 45°, such that the cutting edge 2a to be processed points towards the base U.

[0076] Third embodiment: Grinding configuration with grinding gauge (not shown)

[0077] Replaced Figure 6 and Figure 7 In the illustrated embodiment, the cutting tool 1, in its assembled state—or each blade 2, 3 individually in its disassembled state—can be positioned by means of a grinding caliper (not shown) such that the blades 2, 3 to be processed are aligned with the base U at a predetermined working angle of approximately 40 to 50°. This allows for targeted adjustment of the predetermined grinding angle of the rotating grinding or polishing surfaces 5a / b, perpendicular to the base U and aligned with the tumbler grinder 5. The grinding caliper can be an integral part of the cutting tool 1, particularly in the cutting configuration. For transfer to the grinding configuration, the grinding caliper can, for example, be disengaged from or adjusted relative to at least one of the blades 2, 3.

[0078] Fourth embodiment ( Figures 9 to 15 Support section along the axis

[0079] The following is for reference. Figure 8-15 The fourth embodiment of the present invention will be described in detail below. For the same features, the same reference numerals as in the foregoing embodiments will be used, and repeated descriptions will be omitted.

[0080] According to the fourth embodiment, the cutting tool 1 is configured as a hinged scissor and... Figures 8 to 13 Various computer-generated views (CAD) are shown, as well as in Figures 14 to 15The photograph view is shown in at least a portion of the image.

[0081] In the cutting configuration, the blades 2 and 3 of the articulated scissors are arranged crosswise on the axis X between the handles 2c and 3c and the cutting edges 2a and 3a respectively, and are rotatably supported relative to each other, such that the handles 2c and 3c and the cutting edges 2a and 3a of the two blades 2 and 3 are respectively opposite to each other.

[0082] In the current configuration, axis X is configured, for example, as a screw axis with a bolt and a cap nut, the bolt and cap nut being components 6 and 7 that protrude along axis X from blades 2 and 3, and are detachable from each other to transfer the cutting tool 1 from the cutting configuration to the grinding configuration. Bolt 6 includes a head and a threaded shank extending from the head. The shank can be screwed into a complementary threaded receptacle of the threaded cap nut 7. In the connected state or in the cutting configuration, bolt 6 and cap nut 7 protrude axially from blades 2 and 3 on both sides (see...). Figure 8 and Figure 9 ).

[0083] In an alternative embodiment (not shown), blades 2 and 3 are disengagedly coupled via a bayonet lock. Here, axis X forms the male component of the bayonet lock and is securely connected to one of blades 2 and 3. At the distal end, axis X has an engagement profile (or "key") that engages or disengages from a receiving profile (or "lock") at the other blade in a specific rotational orientation, the receiving profile forming the female component of the bayonet lock. The bayonet lock can be concealed via an inserted cap that forms components 6 and 7 protruding from blades 2 and 3 along axis X.

[0084] The protruding components 6 and 7 of the cutting tool 1 along the axis X are formed approximately identically or mirror-symmetrically, tapering particularly towards their wedge-shaped ends. Components 6 and 7 function as "grinding calipers" to support each blade 2 and 3 relative to the planar base U at a constant working angle α, for example, 45°, in a grinding configuration. The shapes of components 6 and 7 can be chosen independently of each other if necessary. The wedge shape of components 6 and 7 is defined by two sidewalls forming the planar support section 4 and meeting each other at the apex 6a. Starting from the apex 6a, the spacing between the sidewalls increases to form a V-shaped edge surrounding the flattened portion 6b. Figure 10 ).

[0085] In the grinding configuration, the two blades 2 and 3 are separated from each other.

[0086] The sidewall of component 6 facing away from the cutting edge 2a of blade 2 forms a support section 4. This support section, together with other support sections 4, such as those at the back of handle 2c and possibly at the back of blade 2b, defines a support plane AE. Blade 2 can be supported on a planar base U with respect to this support plane so as to maintain a constant working angle relative to the planar base U. The apex 6a of component 6 points here toward the handle 2c of blade 2.

[0087] Component 6 is preferably rotatable relative to the corresponding blade 2, enabling it to self-align until the sidewall forming the support segment 4 and the other support segments 4 of the blade 2 to be processed are precisely located in the support plane AE. In the desired rotational orientation, component 6 can preferably be locked relative to the blade 2, preventing unintentional twisting relative to the blade 2. However, it is also possible that component 6 can be locked only at the blade 2 with the desired alignment, such that the sidewall forming the support segment 4 and the other support segments 4 of the blade 2 to be processed are precisely located in the support plane AE.

[0088] For grinding or polishing, the cutting edges 2a and 3a of the blades 2 and 3 to be processed are kept in contact with the grinding or polishing surfaces 5a and 5b of the grinding or polishing device 5 (e.g., a tumbler) in step B. Here, the grinding or polishing device 5 moves along the cutting edges 2a and 3a, preferably alternately along a first direction toward the handles 2c and 3c of the blades 2 and 3 and along a second direction away from the handles 2c and 3c of the blades 2 and 3, or always repeatedly moves along one of these two directions (see...). Figure 12 and 13 ).

[0089] After grinding or polishing one blade 2, component 6 can be decoupled from this blade 2 and coupled to another blade 3 so as to stably support the blade 3 on the planar base U according to the same principle, as previously referred to Figures 8 to 13 Describe and refer to Figure 14 and 15 The photo illustration in the image shows this.

[0090] In other words, component 6 forms a support section 4 protruding along axis X to support each blade 2, 3 in the grinding configuration with a constant working angle α in the disassembled state of the cutting tool 1 on the base U.

[0091] List of reference numerals

[0092] 1. Cutting tools

[0093] 2, 3 blades

[0094] 2a, 3a cutting blades

[0095] 2b and 3b blades

[0096] 2C and 3C controllers

[0097] 4 Support Section

[0098] 5. Grinding or polishing equipment (turret grinder)

[0099] 5a, 5b Grinding or polishing surfaces

[0100] 5c Device Body

[0101] 6. Components protruding along the axis (bolts)

[0102] 6a Vertex

[0103] 6b Flattening section

[0104] 7. Components protruding along the axis (cap nuts)

[0105] AE Support Plane

[0106] B. Observation direction parallel to the axis

[0107] P is the viewing direction perpendicular to the supporting plane.

[0108] U-shaped base

[0109] X-axis

Claims

1. A cutting tool (1), comprising: Two blades (2, 3), each having a cutting edge (2a, 3a), are movable relative to each other in a cutting configuration of a cutting tool (1) for shearing material. The cutting tool (1) is characterized in that it is reversibly transferable from the cutting configuration to a grinding configuration, in which the blades (2, 3) are separated to grind or polish one or both of the cutting edges (2a, 3a) by means of a grinding or polishing device (5), and are individually arranged on a planar base (U) such that the blades (2, 3) are positioned relative to the base (U) at... A constant working angle (a) alignment, or the ability to lock the blades (2, 3) relative to each other in the grinding configuration, wherein the cutting tool (1) has at least one support section (4) defining a support plane (AE), by means of which the cutting tool (1) or each blade (2, 3) can be stably arranged individually on a flat base (U) in the grinding configuration, such that the blades (2, 3) with the cutting edge (2a, 3a) to be processed are aligned with the support plane (AE) at a working angle (α) in the range of 10 to 80°.

2. The cutting tool (1) according to the preceding claim, characterized in that, At least one support segment (4) defines the support plane (AE) such that at least one of the following requirements is satisfied: a. The blades (2, 3) having the cutting edges (2a, 3a) to be processed are aligned with the support plane (AE) at a working angle (α) in the range of 25 to 75°. b. The blades (2, 3) each include at least one support segment (4) defining the support plane (AE). c. The cutting tool (1) includes at least three support segments (4) defining the support plane (AE), the support segments being not located on a single line. d. The cutting edges (2a, 3a) to be processed extend in planes that are aligned with or parallel to the support plane at an angle of up to 10° relative to the support plane (AE). e. The cutting edges (2a, 3a) to be processed have a distance from the supporting plane (AE) in the range of 5 to 50 mm. f. When projected onto the support plane (AE), the cutting edge (2a, 3a) to be processed begins at its intersection with another cutting edge (2a, 3a) completely outside the other blade (2, 3). g. The distal end section of the blade (2, 3) having the cutting edge to be processed is mounted on the distal end section of the other blade (2, 3). h. When projected onto the support plane (AE), the support segment (4) is located below the blade (2, 3) or does not protrude from the blade (2, 3) or the cutting edge (2a, 3a).

3. The cutting tool (1) according to claim 1, characterized in that, Each of the blades (2, 3) has a cutting edge (2a, 3a) at one end and a handle (2c, 3c) at the other end.

4. The cutting tool (1) according to claim 3, characterized in that, The cutting tool (1) is configured as a hinged scissor, and the blades (2, 3) are arranged crosswise on the axis (X) between the handle (2c, 3c) and the cutting edge (2a, 3a) respectively in the cutting configuration and are rotatably supported on each other, such that the handle (2c, 3c) and the cutting edge (2a, 3a) of the two blades (2, 3) are respectively opposite to each other.

5. The cutting tool (1) according to claim 3 or 4, characterized in that, Each of the blades (2, 3) includes a blade blade (2b, 3b) having the cutting edge (2a, 3a), and the blade blade (2b, 3b) of one of the blades (2, 3) is at least partially superimposed on the handle (2c, 3c) of the other blade (2, 3) in the grinding configuration.

6. The cutting tool (1) according to claim 1, characterized in that, The blades (2, 3) are reversibly transferable between an open and a closed position in the cutting configuration to cut material, in which the material can be arranged between the cutting blades (2a, 3a) and in which the cutting blades (2a, 3a) are directly stacked on top of each other in the closed position, wherein the cutting tool (1) is transferable to the grinding configuration in the open position of the blades (2, 3) by locking the blades (2, 3).

7. The cutting tool (1) according to claim 1, characterized in that, The two cutting edges (2a, 3a) form an angle (β) in the grinding configuration within the range of 135° to 180°.

8. The cutting tool (1) according to claim 1, characterized in that, The blades (2, 3) are magnetically or mechanically locked in the grinding configuration.

9. The cutting tool (1) according to claim 1, characterized in that, The blades (2, 3) can be disengaged from each other and coupled to each other in different arrangements in order to transfer the cutting tool (1) from the cutting configuration to the grinding configuration.

10. A method for grinding or polishing a cutting tool (1) according to claim 1, the cutting tool having two blades (2, 3), each blade 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 shearing material, wherein the method comprises: a. Step A: Transfer the cutting tool (1) from the cutting configuration to the grinding configuration, in which the blades (2, 3) are separated from each other and can be individually arranged on the flat base (U) such that the blades (2, 3) are aligned with respect to the base (U) at a constant working angle (a), or in the grinding configuration the blades (2, 3) can be locked relative to each other. b. Step B: In the grinding configuration, one or both of the two cutting edges (2a, 3a) are ground or polished using a grinding or polishing device (5). c. Step C: Transfer the cutting tool (1) from the grinding configuration to the cutting configuration.

11. The method according to claim 10, characterized in that, In step B, the blade (2, 3) with the cutting edge (2a, 3a) to be processed is supported on another blade (2, 3).

12. The method according to claim 10, characterized in that, In step B, the cutting tool (1) or at least the cutting edge (2a, 3a) to be processed is stably held on the flat base (U) such that the blade (2, 3) with the cutting edge (2a, 3a) to be processed is aligned with the base (U) at a working angle (α) in the range of 10 to 80°.

13. The method according to claim 10, characterized in that, In step B, the cutting edge (2a, 3a) to be processed remains in contact with the grinding or polishing surface (5a, 5b) of the grinding or polishing device (5), and the grinding or polishing device (5) moves along the cutting edge (2a, 3a).

14. The method according to claim 10, characterized in that, The positions of the blades (2, 3) are exchanged between machining one cutting edge (2a) and machining another cutting edge (3a).

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