Scissors capable of transitioning between cutting and sharpening configurations

Abstract

The present invention relates to a cutting tool (1), in particular a pair of scissors, comprising two blades (2, 3) each having a cutting edge (2a, 3a) and which can be moved relative to one another in a cutting configuration in order to cut a material. The object of the invention is to facilitate the sharpening and / or polishing of the cutting edges (2a, 3a) of a cutting tool (1) of this kind. To this end, the cutting tool (1) can be reversibly transferred from the cutting configuration to a sharpening configuration in which the blades (2, 3) are separated from one another in order to sharpen and / or polish one or both of the cutting edges (2a, 3a) by means of a sharpening or polishing device (5), in particular a roller sharpener (5), and each of the blades can be individually positioned on a flat surface (U) so that the blades (2, 3) are oriented at a constant working angle (α) relative to the surface (U), or the blades (2, 3) are locked to one another. The present 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, in particular scissors, comprising two blades having cutting edges and which can be moved relative to one another in a cutting configuration of the cutting tool to cut material. [Background technology]

[0002] The cutting edges of these blades must be freely accessible so that they can be processed by sharpening or polishing equipment. Maintaining a constant sharpening angle between the blade being processed and the sharpening or polishing equipment is also important for accurate sharpening or polishing. However, because the blades are movable relative to one another, sharpening or polishing the cutting edges of scissors is much more complicated than sharpening or polishing a single, stationary knife blade.

[0003] The problem underlying the present invention is to facilitate the sharpening or polishing of cutting edges of common cutting tools. Summary of the Invention

[0004] To solve this problem, the present invention provides the features of claim 1. The present invention discloses a cutting tool, in particular scissors, comprising two blades each having a cutting edge and which can be moved relative to one another in a cutting configuration of the cutting tool to cut material, the cutting tool being reversibly transferable from the cutting configuration to a sharpening configuration in which the blades are separated from one another in order to sharpen and / or polish one or both of the cutting edges by means of a sharpening or polishing device, in particular a roller sharpener, and each can be individually placed on a flat surface, so that the blades are oriented at a fixed working angle relative to the surface, or the blades are locked to one another.

[0005] Scissors, such as garden shears, are known to be in a non-use position where the blades are locked together for safety reasons, with both blades overlapping and closed. In this position, the shears adopt a compact shape and can be easily stored. Furthermore, with the blades in the closed position, the user cannot be injured by the blades. However, the blades cannot be sharpened or polished in this position.

[0006] However, because the two blades of the scissors can move relative to one another in the cutting configuration and the angle of sharpening or polishing must remain constant, the ability to transition the cutting tool to a sharpening configuration, in which the blades are separated or fixed relative to one another and at least one cutting edge is accessible for sharpening or polishing, is a crucial advantage when sharpening or polishing the cutting edges. Locking the blades ensures their relative orientation to one another, or allows individual blades to be individually oriented and processed, allowing the user to focus on sharpening or polishing the cutting edges. Preferably, each blade can be stably positioned on a flat surface, meaning that the blade can stand on its own on the flat surface. However, because the force exerted on the blade typically exceeds the static friction of the blade on the flat surface, the blade must be manually secured during sharpening and / or polishing.

[0007] In the grinding configuration, the blade being machined can be stabilized or supported with the help of another blade during grinding or polishing, or the blade itself can be placed on a flat surface ready for machining, i.e., the blade forms its own grinding fixture. As a result, the cutting tool as a whole is easier to machine in the grinding configuration than in the cutting configuration, where the two blades can move relative to one another.

[0008] It is convenient for the cutting tool, preferably the individual blade, to have at least one support section defining a support surface on which the cutting tool or the individual blade in an abrasive configuration can be stably positioned on a flat surface, preferably such that at least one of the following requirements is met in the process:

[0009] The blade with the cutting edge to be machined is oriented relative to the support surface at a working angle in the range of 10 to 80°, preferably in the range of 25 to 75°, preferably at a working angle of 30 to 60°, particularly preferably at a working angle of 40 to 50°, in particular at a working angle of 45°.

[0010] - each of the blades (i.e. each of the blades) comprises at least one support section defining a support surface, preferably three support sections each, at least one of the support sections preferably being located outside the blade surface and / or protruding above the blade surface in order to support the blade at least in the sharpening configuration, particularly preferably the maximum protrusion of the support section above the blade surface in the sharpening 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 rear side of the blade);

[0011] The cutting tool defines a support surface and comprises a total of at least three non-aligned support sections.

[0012] The cutting edge to be machined extends in a plane oriented at an angle of at most 10°, preferably at most 5°, preferably 0°, to the support surface or is parallel to the support surface.

[0013] The cutting edge to be machined has a distance from the support surface in the range of 5 to 50 mm, preferably in the range of 10 to 30 mm, preferably 15 to 25 mm.

[0014] When projected onto the support surface, the cutting edge to be machined, starting from the point of intersection with the other cutting edge, is located completely outside the other blade.

[0015] The distal part of the blade with the cutting edge to be machined is placed, preferably planar, on the distal part of the other blade.

[0016] When projected onto the support surface, the support section is below the blade and / or does not protrude above the blade or cutting edge.

[0017] Once these requirements are met, the blade is optimally oriented relative to the cutting edge to be prepared for grinding or polishing using a grinding or polishing device. Preferably, the cutting tool has at least one separate support section for each cutting edge, defining a separate support surface for that cutting edge.

[0018] It may also prove useful to have a cutting edge at one end of each blade and a handle at the other end. This makes the cutting tool easier to use, particularly in the cutting configuration. Preferably, a support section is located on the handle of each blade. Preferably, another support section is located on the rear side of each blade, or on the side of the blade opposite the cutting edge.

[0019] The cutting tool is configured as a swivel scissors, with the blades in the cutting configuration arranged crosswise on an axis disposed between the handle and the cutting edges, and the handle and the cutting edges of both (pair of) blades are rotatably attached to each other so that they are opposite each other in each case; preferably, the cutting tool has at least one support section protruding along the axis as described in claim 2, the support section being formed in particular as part of the axis or being removably connected to the cutting tool; preferably, the axis for transitioning the cutting tool between the cutting and sharpening configurations is detachable from at least one of the blades, so that the blades can be separated from each other and / or locked in different configurations relative to each other; preferably, the axis has two removably connectable parts, in particular a threaded bolt and a matching cap nut, or it may also be preferred that the axis forms a male part of a bayonet lock attached to one blade and removably connectable to the female part of the bayonet lock of the other blade. Swivel scissors are versatile and easy to handle, and are particularly common in practice. In a preferred embodiment, each blade includes a support section on the handle, another support section on the rear side of the blade, and yet another support section on the extension of the axis. These three support sections preferably form a support surface for stable three-point support of the blade in the sharpening configuration, especially when the blades are separated from each other in the sharpening configuration. In this case, the support section on the extension of the axis forms a kind of "pillar" outside the other two support sections in or near the blade plane. It is convenient that, when projected onto the support surface, the support section on the extension of the axis does not protrude above the cutting edge. This prevents a roller sharpener from abutting this support section when sharpening or polishing the blade. The axial protrusion of the support section on the extension of the axis above the blade surface in the cutting and / or sharpening configuration may be preferably 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 rear side of the blade. It may be useful for the support section to be flat or to form a kind of V-edge at the end opposite the blade.In a preferred embodiment, the shaft is attached to one blade and forms the male portion of a bayonet lock that can be removably coupled to the female portion of the bayonet lock of the other blade. In this context, the distal end of the shaft can be provided with a "key" that can be engaged with or disengaged from an associated "lock" on the other blade, for example, in positions where the blades form an opening angle with respect to each other in the range of 120-180° or 140-160°. This prevents the blades from unintentionally separating from each other when in a cutting configuration. However, it may also be convenient for the cutting tool to include a removable cover for the shaft, the cover including at least one support section as described in claim 2. Preferably, each of the blades has such a cover, or a cover can be coupled to each of the blades.

[0020] However, it may also be convenient for each of the blades to include a blade body with a cutting edge, preferably such that the blade body of one blade at least partially overlaps and / or contacts the handle of the other blade in the sharpening configuration, and preferably such that each of the handles has a handle opening, and the blade body of one blade at least partially covers the handle opening of the other blade in the sharpening configuration (especially when viewed axially). This arrangement can, for example, maximize the opening angle of the two cutting edges in the sharpening configuration. However, a key idea of ​​the present invention is also to couple the two blades of a cutting tool to each other for sharpening and / or polishing, such that one blade serves as a stable bearing or support for sharpening or polishing the other blade or the cutting edge disposed thereon. This allows for particularly precise sharpening and polishing. The support section is preferably located on the handle, preferably on the opposite side of the other handle from the blade. If the blade body of the blade to be machined overlaps, especially when projected axially or on a support surface, and / or is in contact with the handle of the other blade, the blade body of the blade to be machined can be supported or placed directly on the handle of the other blade. In this way, the opening angle of the two cutting edges in the machining position can be further increased. Since a handle opening is usually not required in the machining position, it can be covered by the blade body of the other blade to maximize the opening angle of the two cutting edges. When two blades are connected by a common rotation axis, grinding or polishing the cutting edge to be machined may cause vibrations in the blade to be machined. By placing the blade body of the blade to be machined on the handle of the other blade, these vibrations can be damped or prevented. Ideally, both handles are made of an elastic material (plastic) and / or have at least one elastic support section (a silicone pad or a magnet with an elastic coating) on ​​the side that contacts the blade body of the other blade. This support section can function as a carrier for the blade to be machined and as a locking device for the blade in the machining position.It is also possible to connect two blades together in such a way that, in a disassembled state where they are not connected via a common axis of rotation, the blade to be machined is supported on and by the other blade, which in particular makes it possible to increase the footprint of the cutting tool, i.e. the area enclosed by the support sections that define the support surface, in order to improve the stability of the cutting tool in the sharpening configuration.

[0021] The blade in the cutting configuration for cutting material may be reversibly movable between an open position, in which material can be placed between the cutting edges, and a closed position, in which the cutting edges are directly overlapping each other. It may be convenient for the cutting tool to be able to transition to the sharpening configuration by locking the blade in the open position, preferably the maximum open position, of the blade. This maximizes the space between the open cutting edges, making them available for sharpening or polishing. Alternatively, the opening angle between the two cutting edges in the sharpening configuration may be greater than the opening angle in the maximum open position of the blade in the cutting configuration. This prevents the blade from unintentionally transitioning from the cutting configuration to the sharpening configuration, or vice versa, which would be undesirable when operating the cutting tool.

[0022] It can be advantageous for the two cutting edges in the sharpening configuration to have an opening angle in the range of 135° to 180°, preferably 150° to 180°, relative to the common axis of rotation of the blades, which makes the cutting edges particularly accessible for sharpening or polishing, and makes sharpening or polishing particularly easy.

[0023] It may prove useful for the blades to be locked magnetically or mechanically in the sharpening configuration. A magnetic lock of the two blades can be easily established and released, especially without the use of tools. Other locks are also possible. A mechanical lock, for example by means of a screw, is particularly secure, as it can withstand the high forces exerted on the blades when sharpening or polishing.

[0024] The blades can be removed from one another or connected to one another in different configurations to transition the cutting tool from the cutting configuration to the sharpening configuration. Preferably, the blade bodies of the blades in the sharpening configuration are oriented in different, non-parallel planes, particularly transverse or perpendicular to one another. Preferably, the blades are arranged in a generally T-shape. As a result, the cutting tool in the sharpening configuration can have a particularly stable footing on a flat surface for processing with a sharpening or polishing tool. Furthermore, this arrangement allows particularly easy access to the cutting edge to be processed. In this embodiment, the blade to be processed is connected to the other blade in a disassembled state, with its blade body, preferably an opening that accommodates the common rotation axis in the cutting configuration of the cutting tool, placed at the end or rear of the handle of the other blade that is not to be processed, and the blades are held there magnetically or mechanically. In this context, the blade body of the blade to be processed is oriented at a working angle of ideally 40 to 50 degrees relative to the support surface or surface, with the cutting edge to be processed facing the support surface or surface. A grinding or polishing device can then be moved along the edge to be worked to sharpen the edge by removing or grinding away blade material.

[0025] To lock the blades in the working position, it is convenient to couple the blade body of one blade to the handle of the other blade. Since the handle is usually located at one end of the blade and the blade body at the other end of the blade, coupling the handle and blade body together allows for a particularly stable locking of the blades in the working position. Furthermore, this reduces the free length of the blades, which are otherwise only connected at a common axis. As a result, vibrations caused by grinding or polishing can be reduced from being transmitted to the blade being worked.

[0026] Another independent aspect of the invention relates to a method for grinding and / or polishing a cutting tool, in particular a cutting tool according to one of the above embodiments, said cutting tool comprising two blades each having a cutting edge, the blades being movable relative to one another in a cutting configuration of the cutting tool to cut material, said method comprising:

[0027] Step A: Transitioning the cutting tool from the cutting configuration to a sharpening configuration, in which the blades are separated from one another and can be individually positioned on a flat surface so that they are oriented at a fixed working angle relative to the surface, or the blades are locked together.

[0028] Step B: In the sharpening configuration, one or both of the cutting edges is sharpened and / or polished by means of a sharpening or polishing device, in particular a roller sharpener.

[0029] Step C: transitioning the cutting tool from the sharpening configuration to the cutting configuration.

[0030] It may be helpful in step B for the blade with the cutting edge to be machined to be supported on the other blade, preferably on the handle of the other blade, preferably on the end of the other blade opposite the cutting edge, so that the cutting tool has a particularly stable base in the sharpening configuration.

[0031] In step B, it may be useful to hold the cutting tool, or at least the blade to be machined, stably on a flat surface and orient the blade to be machined relative to the surface at a working angle in the range of 10 to 80°, preferably in the range of 15 to 75°, more preferably in the range of 30 to 60°, particularly preferably in the range of 40 to 40°, and especially at a working angle of 45°, which makes it easier to maintain a constant working angle when the cutting edge to be machined is machined.

[0032] The blade body of the blade with the cutting edge to be machined is positioned in step B so that the handle of the other blade is at least partially positioned between this blade body and the surface, preferably it may prove useful for the blade body of the blade with the cutting edge to be machined to be placed on the handle of the other blade, preferably on a flat surface, so that the blade body of one blade can be stably supported on the handle of the other blade in the sharpening configuration.

[0033] It may be convenient for the cutting edge to be processed in step B to be held against the grinding or polishing surface of the grinding or polishing device, and for the grinding or polishing device to be moved along the cutting edge, preferably alternately in a first direction towards the handle of the blade and in a second direction away from the handle of the blade, or to be moved repeatedly in either of these two directions, so as to obtain a particularly good grinding or polishing result.

[0034] It may also be convenient to grind or polish both cutting edges in step C with the same sharpening configuration of the blade. This makes it easier to grind and / or polish both cutting edges of the cutting tool, since the sharpening configuration of the cutting tool can be maintained and only the position of the grinding or polishing device needs to be changed.

[0035] It may be advantageous to exchange the position of the blades between machining one cutting edge and machining the other, preferably so that in both cases the blade that is not machined supports the blade that is machined, for example the handle of the blade body with the not machined cutting edge can serve as a carrier for the blade body with the machined cutting edge.

[0036] A further independent aspect of the present invention relates to a set comprising a cutting tool according to one of the above embodiments and a sharpening jig, by means of which each of the blades can be positioned on a flat surface of the cutting tool in the assembled or disassembled state, and the blades are oriented relative to said surface at a working angle in the range of 10 to 80°, preferably in the range of 25 to 75°, more preferably in the range of 30 to 60°, particularly preferably at a working angle of 45°, preferably the sharpening jig is fixedly connected to the cutting tool at least in the cutting configuration and / or is adjustable relative to at least one of the blades to move the sharpening jig into the sharpening configuration. In particular, the sharpening jig can be at least partially formed by a support section according to claim 2 projecting along an axis according to claim 4, which, at least in the cutting configuration, protrudes above the blade to be processed to define only the support surface, or, if necessary, cooperates with other support sections, for example on the handle and / or on the backside of the blade to be processed.

[0037] Preferably, the set also comprises a grinding and / or polishing device, in particular in the form of a roller polisher as known, for example, from EP 3278928, which grinding and / or polishing device has at least one grinding and / or polishing surface, and when the grinding and / or polishing device is rolled over a flat surface, the device rotates in a plane oriented perpendicular to this surface.

[0038] Further preferred embodiments of the invention result from the combinations of features disclosed in the specification, the claims and the drawings.

[0039] The open position is the position of the blade in which the cutting edges of the blade are available for grinding and / or polishing or for placing material to be cut between the cutting edges.

[0040] The locked state is a state in which the blades are in an abrasive configuration and therefore cannot move relative to one another.

[0041] By reversibly transitionable, it is meant that the cutting tool can be transitioned not only from the cutting configuration to the abrasive configuration, but also from the abrasive configuration back to the cutting configuration, and preferably these transitions can be repeated as many times as necessary.

[0042] Stable means that the cutting tool rests on a flat, level, horizontal surface, preferably without tipping or other forces acting on it, but only by its own weight. [Brief explanation of the drawings]

[0043] [Figure 1] FIG. 1 shows an exemplary cutting tool according to the present invention in the form of a pivoting scissors having two blades mounted crosswise on a common axis of rotation in a cutting configuration in a partially open position, the view being along or parallel to the axis of rotation. [Figure 2] FIG. 2 shows a further exemplary cutting tool according to the present invention in the form of a pivoting scissors having two blades mounted crosswise on a common axis of rotation, the blades locked relative to each other in a sharpening configuration, the blade body of the upper blade resting on the handle of the lower blade, and the cutting edge of the upper blade being sharpened with a roller sharpener, shown diagrammatically. [Figure 3] Figure 3 shows a schematic side view of the arrangement shown in Figure 2, in which the cutting edge of the upper blade is machined with a roller sharpener, the blade body of the upper blade is oriented at a working angle of 15° or 20° relative to a flat surface, the handle of the lower blade is stably resting on a surface with a support section defining a support surface, thereby supporting the blade body of the upper blade, and the cutting edge of the upper blade protrudes above the handle of the lower blade when projected onto the support surface, thereby providing optimal access for the roller sharpener. [Figure 4] FIG. 4 shows a photographic image of a sharpening configuration of a cutting tool according to the present invention, with the blades locked in a maximum open position relative to each other and the user holding the cutting tool and indicating the maximum blade opening angle stop with the tip of the pin. [Figure 5] FIG. 5 shows a photograph of the cutting tool according to FIG. 4 in the grinding configuration during grinding with a roller grinder. [Figure 6] Figure 6 shows a photograph of an alternative embodiment of a cutting tool according to the invention in a sharpening configuration, where the blades are locked in a different arrangement relative to each other when separated, with the blade to be machined, together with its blade body, supported at the rear of the handle of the blade not to be machined, oriented in a plane approximately perpendicular to the blade body of this blade, with the cutting edge to be machined facing the surface and the blade body oriented at the intended working angle of 40-50° relative to the surface. [Figure 7] Figure 7 shows an enlarged detail of the arrangement in Figure 6. [Figure 8] Figure 8 shows a computer-generated schematic top view of a cutting tool according to a further embodiment of the invention, the view direction being perpendicular to the plane of the blade body or the plane of movement of the scissors, the cutting tool being configured as pivoting scissors, the blade in the cutting configuration being arranged crosswise on an axis arranged between the handle and the cutting edge, and the cutting edges of both the handle and the blade being rotatably mounted relative to each other so that they are in each case opposite each other, the cutting tool having at least one support section protruding along the axis, which support section, together with a further support section on the back of the handle and the blade in the sharpening setting, defines a support surface for placing the blade to be machined on a flat surface. [Figure 9] FIG. 9 shows a computer-generated schematic side view of the cutting tool according to FIG. 8, the view direction being parallel to the plane of the blade body or parallel to the plane of movement of the scissors. [Figure 10] FIG. 10 shows a computer-generated perspective view and schematic diagram of the cutting tool according to FIGS. [Figure 11]FIG. 11 shows a computer-generated perspective schematic diagram of a sharpening arrangement in which the blade of the cutting tool according to FIGS. 8 to 10 is in a sharpening configuration, positioned on a flat surface, the blade is detached from the other blade of the cutting tool and supported on the flat surface by a support section protruding along the pivot axis of the cutting tool, and the blade is stably placed on the surface for sharpening and / or polishing. [Figure 12] Figure 12 shows from another angle the arrangement according to Figure 11 in combination with a grinding or polishing device in the form of a roller grinder, the cutting edge of the blade to be worked being held against the grinding or polishing surface of the grinding or polishing device. [Figure 13] FIG. 13 shows the arrangement according to FIG. 12 from yet another angle, with the grinding or polishing device in the form of a roller grinder shown semi-transparently. [Figure 14] Figure 14 shows a photographic view of one of the blades of the grinding device shown schematically in Figures 8 to 10 in a grinding configuration in combination with a grinding or polishing device in the form of a roller grinder, where the blade is detached from the other blade of the cutting tool and supported on a flat surface by a support section protruding along the pivot axis of the cutting tool, and this blade is stably placed on the surface for grinding and / or polishing, the cutting edge of the blade to be worked being held against the grinding or polishing surface of the grinding or polishing device by a user whose hand is partially visible in the photograph. [Figure 15] FIG. 15 shows another view of the blade shown in FIG. 14 without the sharpening or polishing device. DETAILED DESCRIPTION OF THE INVENTION

[0044] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0045] First embodiment (FIGS. 1-5): Polishing configuration in assembled state FIG. 1 shows a cutting tool 1 according to a first embodiment of the present invention, which has the shape of scissors 1. The scissors 1 are configured as pivoting scissors 1 and have two blades 2 and 3, each with a cutting edge 2a and 3a, which can move relative to each other in a cutting configuration. Each blade 2 and 3 has a blade body 2b and 3b with a cutting edge 2a and 3a at one end and a handle 2c and 3c at the other end. In the cutting configuration, the blades 2 and 3 are rotatably supported on an axis X intersecting the handles 2c and 3c and the cutting edges 2a and 3a, respectively. As shown in FIG. 1, the handles 2c and 3c and the cutting edges 2a and 3a of the blades 2 and 3 face each other in pairs. When cutting material, the blades 2 and 3 can be reversibly moved between an open position in which the material to be cut can be placed between the cutting edges 2a and 3a in the cutting configuration and a closed position in which the cutting edges 2a and 3a directly overlap each other.

[0046] According to the invention, the cutting tool 1 can be reversibly transferred from a cutting configuration to a sharpening configuration. In the sharpening configuration, the blades 2, 3 are locked relative to one another for sharpening and / or polishing one or both of the cutting edges 2 a, 3 a using a sharpening or polishing device 5, in particular a roller sharpener. The locking can be achieved, for example, by a mechanical or magnetic coupling between the handle 2 c, 3 c of one blade and the blade body 2 b, 3 b of the other blade 2, 3, for example by magnetically or mechanically coupling the blades 2, 3 to one another in the maximum open position.

[0047] The sharpening configuration here corresponds to the maximum open position of the blades 2, 3 locked together, with the cutting edges 2a, 3a making an opening angle β of approximately 165° and being optimally accessible for processing in the sharpening or polishing device 5.

[0048] The scissors 1 include multiple support sections 4 on each handle 2c, 3c, defining a support surface AE on which the cutting tool 1 can be stably positioned on a flat surface U in the locked, sharpening configuration. In the processing position, the blades 2, 3 are oriented with their cutting edges 2a, 3a to be processed at an operating angle α, for example, in the range of 15 or 20°, relative to the support surface AE. When projected onto the support surface AE (viewing direction P in FIG. 3 ), the cutting edges 2a, 3a to be processed begin at the intersection with the other cutting edge 2a, 3a and are located completely outside the other blade 2, 3. Ideally, the cutting edges 2a, 3a to be processed extend parallel to the support surface AE or base U for a distance of approximately 20 mm. Thus, the cutting edges 2a, 3a to be processed are optimally accessible for processing by the sharpening or polishing device 5.

[0049] In the sharpening configuration, the blade body 2b, 3b of one blade 2, 3 overlaps, at least in part, with the handle 2c, 3c and handle opening of the other blade 2, 3 when viewed along axis X (viewing direction B in Figure 3).

[0050] One key idea of ​​the present invention is to lock the two blades 2, 3 of the cutting tool 1 in a sharpening configuration, so that in each case the unmachined blade 2, 3 acts as a stable carrier while the machined blade 2, 3 is being sharpened and / or polished. However, while the two blades 2, 3 can move relative to each other in the cutting configuration, the sharpening angle for machining the cutting edges 2a, 3a must remain constant. For this reason, the cutting tool 1 according to the present invention can be transferred to a sharpening configuration, in which the movement of the two blades 2, 3 is blocked by the lock to facilitate sharpening and / or polishing of one or both of the cutting edges 2a, 3a.

[0051] In the sharpening configuration shown diagrammatically in Figure 3, the blades 2, 3 are oriented with their cutting edges 2a, 3a to be machined at a working angle α of 15 or 20° relative to the surface U. The working angle α corresponds to the angle that the blade body 2b of the upper blade 2 to be machined makes with respect to the surface U. The handle 3c of the lower blade 3, which is not machined, serves as a support and ramp for the upper blade 2 to be machined. In this regard, the cutting tool 1 rests on the surface U with the support section 4 or support surface AE formed thereby.

[0052] To machine the cutting edge (3a) of the other blade 3, the cutting tool 1 is turned over, with the originally lower blade 3 now on top, and the originally upper blade 2 is placed on the surface U with its own support section 4 defining its own support surface AE.

[0053] In the method according to the present invention for grinding and / or polishing the cutting edges 2a, 3a of the cutting tool 1, the cutting tool 1 is first transferred from the cutting configuration to the polishing configuration (Step A). ​​In this polishing configuration, the blades 2, 3 are locked relative to each other, preventing their relative movement. The cutting edges 2a, 3a are then ground and / or polished in the polishing configuration using a grinding and / or polishing device 5, in particular a roller polisher 5 (Step B). For this purpose, the cutting tool 1 together with the support section 4 is stably arranged on a flat surface U, and the unprocessed blade 3, here for example with its handle 3c, serves as the carrier and inclined surface for the processed blade 2 (see FIG. 3). This positions the handle 3c of the unprocessed blade 3 in the area between the blade body 2b of the processed blade 2 and the surface U.

[0054] As shown diagrammatically in Fig. 3, the roller sander 5 comprises a cylindrical device body 5c and two grinding or polishing surfaces 5a, 5b arranged on the end faces of the device body 5c. When the roller sander 5 rolls on a flat horizontal surface U, the grinding or polishing surfaces 5a, 5b rotate in a plane perpendicular thereto (vertical). Such roller sanders 5 are known, for example, from German Utility Model No. 29703326 and European Patent No. 3278928.

[0055] In the sharpening configuration, the cutting edge 2a to be worked of the cutting tool 1 is held against the rotating sharpening or polishing surfaces 5a, 5b of the sharpening and / or polishing device 5. The sharpening / polishing device 5 is thereby repeatedly moved along the cutting edge 2a, for example, alternately in a first direction towards the handle 2c of the blade 2 and in a second direction away from the handle 2c of the blade 2. Alternatively, the sharpening / polishing device 5 may be repeatedly moved along the cutting edge 2a in one of these two directions.

[0056] 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 turned over between the processing of one cutting edge 2a and the processing of the other cutting edge 3a, so that in each case the blade 2, 3 that is not being processed rests on the surface U and supports the blade 2, 3 that is being processed. Once the grinding or polishing is complete, the cutting tool 1 is again transferred from the grinding configuration to the cutting configuration (step C) by unlocking the blades 2, 3, so that the blades 2, 3 can again move relative to each other.

[0057] Second embodiment (FIGS. 6 and 7): Polishing configuration in disassembled state In a second embodiment described below with reference to Figures 6 and 7, the blades 2, 3 are detachable from one another to transition the cutting tool 1 from the cutting configuration to the sharpening configuration and can be coupled to one another in different arrangements.

[0058] The sharpening angle of a high-quality pair of scissors is typically 25° or greater, ideally 45°. To achieve the 45° bevel, the handles 2c, 3c of the blades 2, 3 must be relatively thick, allowing for good application of the grinding / honing tool 5 for sharpening.

[0059] Thus, in an alternative embodiment, the blades 2, 3 of the scissors 1 can be disassembled at the pivot or rotation axis X by means of special screws. The ends of the handles 2c, 3c or scissors jaws of each of the two blades 2, 3 have threads (e.g. insert nuts) or magnets built in at the correct angular position, so that the other blade 2, 3 or scissors jaw can be tightly screwed on or clipped onto via the magnet, which automatically generates the correct sharpening angle on the cutting edges 2a, 3a.

[0060] The sharpening geometry of the cutting tool 1 is shown in Figures 6 and 7. In the sharpening configuration, the blade bodies 2b, 3b of the blades 2, 3 are arranged in a generally T-shape and oriented in different, non-parallel planes. In this context, the blade 2 to be machined is positioned, for example, transversely or perpendicularly at its handle end 3c relative to the blade 3 not to be machined, and the blade body 2c is supported on the handle end 3c of the blade not to be machined. The handle end 3c of the blade not to be machined is configured to support and magnetically or mechanically hold the blade 2 to be machined so that it is oriented at a working angle of 45° relative to the surface U, such that the cutting edge 2a to be machined faces the surface U.

[0061] Third embodiment: Polishing configuration using a polishing jig (not shown) As an alternative to the embodiment shown in Figures 6 and 7, a sharpening jig (not shown) can be used to position the cutting tool 1 in an assembled state or with each blade 2, 3 individually disassembled so that the blades 2, 3 to be processed are oriented at an intended working angle of approximately 40° to 50° relative to the surface U. As a result, the intended sharpening angle relative to the rotating abrasive or polishing surfaces 5a / b of the roller abrader 5 aligned perpendicular to the surface U can be set in an intended manner. The sharpening jig can be an integral part of the cutting tool 1, particularly in the cutting configuration. To transition to the sharpening configuration, the sharpening jig can, for example, be removed from or adjusted relative to at least one of the blades 2, 3.

[0062] Fourth embodiment (FIGS. 9 to 15): Axial support section A fourth embodiment of the present invention will be described in detail below with reference to Figures 8 to 15. The same functions as in the previous embodiments will be designated by the same reference numerals, and duplicated descriptions will be omitted.

[0063] The cutting tool 1 according to the fourth embodiment is configured as a swivel scissors and is shown in various computer-aided design (CAD) drawings in Figures 8 to 13 and at least partially in photographic representation in Figures 14 and 15.

[0064] In the cutting configuration, the pivoting scissors 2, 3 are arranged crosswise on an axis X, which is arranged between the handles 2c, 3c and the cutting edges 2a, 3a in each case, and are mounted so as to be rotatable relative to one another, so that the handles 2c, 3c and the cutting edges 2a, 3a of both blades 2, 3 are in each case opposite one another.

[0065] In this case, the axis X is formed as a threaded axis X, for example, by a threaded bolt and a cap nut, which are formed as parts 6, 7 protruding along the axis X above the blades 2, 3 and are detachable from one another to transfer the cutting tool 1 from the cutting configuration to the sharpening configuration. The threaded bolt 6 includes a head and an externally threaded shank extending therefrom. The shank can be screwed into a complementary threaded receptacle of the cap nut 7, which has an internal thread. In the connected or cutting configuration, the threaded bolt 6 and the cap nut 7 protrude axially above both sides of the blades 2, 3 (see Figures 8 and 9).

[0066] In an alternative embodiment (not shown), the blades 2, 3 are removably coupled via a bayonet lock, whereby the axis X forms the male part of the bayonet lock and is securely connected to one of the blades 2, 3. At its distal end, the axis X is provided with an engagement profile (i.e., "key") that can fit into or disengage from a receiving profile at a specific rotational position, or "lock" onto the other blade, forming the female part of the bayonet lock. This bayonet lock can be covered by an attached cap that forms a protruding portion 6, 7 above the blades 2, 3 along the axis X.

[0067] The portions 6, 7 of the cutting tool 1 protruding along the axis X have substantially identical or mirror-symmetric shapes, in particular, tapering in a wedge shape toward their opposite ends. These portions 6, 7 function as "sharpening jigs" that support each blade 2, 3 in a sharpening configuration at a constant working angle α of, for example, 45° relative to a flat surface U. The shapes of the portions 6, 7 can be selected independently of each other. The wedge shape of the portions 6, 7 is defined by two side flanks that form the flat support section 4 and meet at a vertex 6a. Starting from this vertex 6a, the sides increase in distance from each other to form a V-shaped edge including a flat portion 6b (FIG. 10).

[0068] In the sharpening configuration, the two blades 2, 3 are separated from each other.

[0069] The side of the portion 6 opposite the cutting edge 2a of the blade 2 forms a support section 4 which, together with the other support sections 4, for example at the rear side of the handle 2c and possibly at the rear side of the blade body 2b, defines a support surface AE by means of which the blade 2 can be supported on the flat surface U so as to be held at a constant working angle relative to the flat surface U. The apex 6a of the portion 6 points towards the handle 2c of the blade 2.

[0070] Preferably, the part 6 is rotatable relative to the corresponding blade 2, so that it can reorient itself until the side surface forming the support section 4 lies exactly in the support plane AE together with the other support sections 4 of the blade 2 to be machined. In the desired rotational position, the 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 to lock the part 6 to the blade 2 only in the desired orientation, so that the side surface forming the support section 4 lies exactly in the support plane AE together with the other support sections 4 of the blade 2 to be machined.

[0071] For grinding or polishing, the cutting edges 2a, 3a of the blades 2, 3 to be processed are held in contact with the grinding or polishing surfaces 5a, 5b of a grinding or polishing device 5, such as a roller grinder, in step B. In this context, the grinding or polishing device 5 is preferably moved along the cutting edges 2a, 3a alternately in a first direction towards the handles 2c, 3c of the blades 2, 3 and in a second direction away from the handles 2c, 3c of the blades 2, 3, or moved repeatedly in either of these two directions (see Figures 12 and 13).

[0072] After grinding or polishing of one blade 2 is completed, the portion 6 can be separated from the one blade 2 and attached to the other blade 3, so that this blade 3 is also stably supported on the flat surface U according to the same principle, as described above with reference to Figures 8 to 13 and shown with reference to the photographs in Figures 14 and 15.

[0073] In other words, the portion 6 forms a support section 4 which projects along the axis X and supports each blade 2, 3 in an abrasive configuration in the disassembled state of the cutting tool 1 at a constant working angle α on the surface U. [Explanation of symbols]

[0074] 1 cutting tool 2, 3 blades 2a, 3a cutting edge 2b, 3b blade body 2c, 3c handle 4 Support Section 5. Grinding or polishing equipment (roller polishers) 5a, 5b Polished or polished surface 5c Device body 6 Axial protruding part (thread bolt) 6a Vertex 6b Flat part 7 Axial protruding part (cap nut) AE support surface Viewing direction parallel to the B axis P View direction perpendicular to the support surface U-face X-axis

Claims

1. A cutting tool (1) comprising two blades (2, 3) each having a cutting edge (2a, 3a) and which can be moved relative to one another in a cutting configuration of the cutting tool (1) to cut material, The cutting tool (1) is reversibly transferable from the cutting configuration to the abrasive configuration; In the polishing configuration, The blades (2, 3) are separated from one another in order to sharpen and / or polish one or both of the cutting edges (2a, 3a) by means of a sharpening or polishing device (5), and each of the blades can be individually placed on a flat surface (U) so that the blades (2, 3) are oriented at a constant working angle (α) relative to the surface (U), or Or, The blades (2, 3) are locked together in the open position; said cutting tool (1) comprises at least one support section (4) defining a support surface (AE) by means of which said cutting tool (1) or each blade (2 a, 3 a) individually can be stably positioned in said abrasive configuration on a flat surface (U); The blades (2, 3) with the cutting edges (2a, 3a) to be machined are oriented with respect to the support surface (AE) at a working angle (α) ranging from 10 to 80°. A cutting tool (1) characterized in that

2. The at least one support section (4) defines the support surface (AE), whereby The process requires the following: a. the blades (2, 3) with the cutting edges (2a, 3a) to be machined are oriented with respect to the support surface (AE) at a working angle (α) in the range of 25 to 75°; b. each of said blades (2, 3) comprises at least one support section (4) defining said support surface (AE); c. said cutting tool (1) comprises a total of at least three non-coherent support sections (4) defining said support surface (AE); d. The cutting edge (2a, 3a) to be machined is at an angle of up to 10° to the support surface (AE). extending in a plane oriented at an angle; e. the cutting edges (2a, 3a) to be machined have a distance from the support surface (AE) in the range of 5 to 50 mm; f) when projected onto the support plane (AE), the cutting edge (2a, 3a) to be machined, starting from the intersection with the other of the cutting edges (2a, 3a), is located completely outside the other of the blades (2, 3); g. the distal portion (2b, 3b) of the blade (2, 3) with the cutting edge (2a, 3a) to be machined is placed on the distal portion of the other of the blades (2, 3); h) when projected onto the support surface (AE), the support section (4) is below the blades (2, 3) and / or does not protrude above the blades (2, 3) or the cutting edges (2a, 3a); The cutting tool according to claim 1, wherein at least one of the following is satisfied.

3. Each of the blades (2, 3) has the cutting edge (2a, 3a) at one end and a handle (2c, 3c) at the other end.

3. A cutting tool according to claim 1 or 2.

4. The cutting tool (1) is configured as a pair of pivoting scissors, the blades (2, 3) in the cutting configuration are arranged crosswise on an axis (X) disposed between the handles (2c, 3c) and the cutting edges (2a, 3a) in each case, and are mounted rotatably relative to one another such that the handles (2c, 3c) and the cutting edges (2a, 3a) of both blades (2, 3) are in each case opposite one another, 4. A cutting tool according to claim 3.

5. Each of the blades (2, 3) includes a blade body (2b, 3b) having the cutting edge (2a, 3a), the blade body (2b, 3b) of one of the blades (2, 3) at least partially overlaps and / or contacts the handle (2c, 3c) of the other of the blades (2, 3) in the sharpening configuration; 3. A cutting tool according to claim 1 or 2.

6. the blades (2, 3) in the cutting configuration for cutting the material are reversibly movable between an open position in which the material can be placed between the cutting edges (2 a, 3 a) and a closed position in which the cutting edges (2 a, 3 a) directly overlap one another; In the open position of the blades (2, 3), the cutting tool (1) can be transferred to the sharpening configuration by locking the blades (2, 3).

3. A cutting tool according to claim 1 or 2.

7. The two cutting edges (2a, 3a) in the sharpening configuration include an opening angle (β) in the range of 135° to 180°.

3. A cutting tool according to claim 1 or 2.

8. The blades (2, 3) are magnetically or mechanically locked into the sharpening arrangement 3. A cutting tool according to claim 1 or 2.

9. The blades (2, 3) can be detached from each other and attached to each other in different configurations to transition the cutting tool (1) from the cutting configuration to the sharpening configuration.

3. A cutting tool according to claim 1 or 2.

10. 3. A method for grinding and / or polishing a cutting tool (1) according to claim 1 or 2, wherein the cutting tool (1) comprises two blades (2, 3) each having a cutting edge (2a, 3a), The blades (2, 3) are movable relative to one another in a cutting configuration of the cutting tool (1) to cut material; The method comprises: a. Step A: Transitioning 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 be individually positioned on a flat plane (U) so that the blades (2, 3) are oriented at a constant working angle (α) relative to the plane (U), or the blades (2, 3) are locked together; b. Step B: In the grinding configuration, grinding and / or polishing one or both of the cutting edges (2a, 3a) by a grinding or polishing device (5); c. Step C: Transitioning the cutting tool (1) from the abrasive configuration to the cutting configuration 10. A method comprising:

11. In step B, the blade (2, 3) having the cutting edge (2a, 3a) to be machined is supported on the other of the blades (2, 3).

11. The method of claim 10.

12. In step B, the cutting tool (1) or at least the blade (2a, 3a) to be machined is held stably on a flat surface (U), and the blade (2, 3) is oriented with the cutting edge (2a, 3a) to be machined at a working angle (α) in the range of 10 to 80° relative to the surface (U).

11. The method of claim 10.

13. The cutting edges (2a, 3a) to be machined in step B are held in contact with the grinding or polishing surfaces (5a, 5b) of the grinding or polishing device (5), and the grinding or polishing device (5) is moved along the cutting edges (2a, 3a).

11. The method of claim 10.

14. The positions of the blades (2, 3) are exchanged between machining one of the cutting edges (2a) and machining the other cutting edge (3a).

11. The method of claim 10.

15. A cutting tool (1) according to claim 1 or 2, A polishing jig; A set comprising: In the assembled or disassembled state of the cutting tool (1), each of the blades (2, 3) can be arranged on a flat surface (U), and the blades (2, 3) are oriented with respect to the surface (U) at an operating angle (α) in the range of 10 to 80°. A set characterized by:

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