Cutting tool, especially scissors, with blades that are spring-loaded against each other.

Abstract

Cutting tool (1), in particular scissors, comprising: two blades (2, 3) each with a cutting edge (2a, 3a) which are movable relative to each other in a cutting configuration of the cutting tool (1) for cutting a material, wherein the cutting tool (1) is reversibly convertible from the cutting configuration to a grinding configuration in which the blades (2, 3) are separated from each other for grinding and / or polishing one or both cutting edges (2a, 3a) with a grinding or polishing device (5), in particular with a roller grinder (5), wherein the cutting tool (1) comprises a connecting bolt (6) which connects both blades (2, 3) in the cutting configuration, wherein the connecting bolt (6) is detachable from at least one of the two blades (2, 3) or from both blades (2, 3) for converting the cutting tool (1) from the cutting configuration to the grinding configuration, wherein at least one of the blades (2, 3)3) can be placed individually and stably on a flat surface, preferably such that the blade (2b, 3b) of the blade (2, 3) is aligned at a constant working angle of preferably 45° to the surface, characterized in that the blades (2, 3) are spring-loaded against each other in the cutting configuration, wherein the connecting bolt (6) is spring-loaded against at least one of the two blades (2, 3) or against both blades (2, 3) in the cutting configuration to generate the preload force, wherein the cutting tool (1) has an opening lock which, in the cutting configuration, when exceeding and / or falling below an opening angle (α) of the two blades (2, 3) designated as the locking angle (α1), can be overcome by increased force exerted by a user, wherein the cutting tool (1) comprises a spring element (5b) and a deflection element (6d) to effect the opening lock,wherein the spring element (5b) is displaced by the deflection element (6d) against its spring force when the locking angle (α1) is exceeded and / or fallen below, wherein the connecting bolt (6) comprises the spring element (5b) or the deflection element (6d).

Description

[0001] The present invention relates to a cutting tool, in particular scissors, comprising: two blades, each with an edge, which are movable relative to each other in a cutting configuration of the cutting tool for cutting a material, wherein the cutting tool can be reversibly converted from the cutting configuration to a grinding configuration, in which the blades are separated from each other for grinding and / or polishing one or both edges with a grinding or polishing device, in particular with a roller grinder, wherein at least one or both blades can be placed individually and stably on a flat surface, so that the blade is aligned at a constant working angle to the surface.

[0002] Such a cutting tool is known from WO 2022 / 233998 A1.

[0003] Experience with the cutting tool known from the prior art has shown that burrs can form on the cutting edge during grinding and / or polishing. These burrs can impair the cutting motion of the two blades when the cutting tool is reconfigured for use. To restore the usual high-quality cutting performance, the blades must be deburred separately after grinding and / or polishing.

[0004] The present invention is based on the objective of remedying this problem and improving a cutting tool of the type mentioned at the outset in order to facilitate the application of the cutting tool, which has been returned to the cutting configuration, following a grinding and / or polishing operation.

[0005] The object of the invention is solved by the subject matter of claim 1.

[0006] A cutting tool, in particular a pair of scissors, is disclosed, comprising: two blades, each with an edge, which are movable relative to each other in a cutting configuration of the cutting tool for cutting a material, wherein the cutting tool can be reversibly converted from the cutting configuration to a grinding configuration, in which the blades are separated from each other for grinding and / or polishing one or both edges with a grinding or polishing device, in particular with a roller grinder, wherein at least one or both blades can be placed individually and stably on a flat surface, preferably such that the blade face of the blade is aligned at a constant working angle of preferably 45° to the surface, wherein the blades are spring-loaded against each other in the cutting configuration.

[0007] The preload acting between the blades forces them together with a defined amount of force during the cutting motion, causing the edges to self-deburr after one or two opening and closing cycles. This spring-like preload also reduces the risk of damaging the blade edges when cutting hard objects. This is because the blades are able to spring back, thus preventing damage to the cutting edges. Due to the spring-like preload, the blades can be pushed apart and tilted slightly. This stress on the blades does not typically occur during normal cutting. However, when cutting materials that could damage the edges, the blades can move apart, trapping the material between them.This can be considered a safety feature for the cutting edges. Before the edges are significantly damaged, the material being cut is held in place by the tension between the blades. Due to the preload of both blades, the shears, unlike many competitors' solutions, can cut immediately as soon as the edges touch. Regardless of how much material has been removed during sharpening, the cutting tool readjusts itself thanks to the spring preload. The closing force of the cutting tool is then preferably constant along the entire length of the cutting edge. Since the blades only need to be minimally aligned and twisted in the cutting area due to the spring preload, there is no noticeable increase in cutting force when the blades close. Another advantage of the spring preload of both blades is that the blades do not rattle in the cutting configuration, as the spring preload presses the two blades together.

[0008] It can be advantageous if the blades in the cutting configuration are spring-loaded against each other, preferably in a direction perpendicular to the planes of the blades, preferably such that at least one of the following conditions is met: - a preload force of the blades, preferably in a direction perpendicular to the planes of the blades in the cutting configuration, is in the range of 1N to 10N, preferably in the range of 2N to 6N, preferably in the range of 3N to 5N. - a preload force of the blades in the cutting configuration is constant over an opening angle range of the two blades from 0° to at least 60°, preferably from 0° to at least 70°, preferably from 0° to at least 75°, wherein the preload force preferably does not deviate by more than + / - 10%, preferably + / - 5% from a mean value over the entire opening angle range. - a spring travel of the blades in / against the preload force, preferably in a direction perpendicular to the planes of the blade blades, in the cutting configuration is in the range of 0.1 to 2.0 mm, preferably in the range of 0.2 to 1.5 mm, preferably in the range of 0.3 to 1.0 mm.

[0009] Favorable results were achieved in trials using the aforementioned parameters. A constant spring force over a large opening angle range is particularly advantageous because the cutting edges can then deburr completely and evenly along their entire length during the opening and closing movement, resulting in a particularly good cutting performance.

[0010] It can prove useful if the cutting tool has an opening lock that, in the cutting configuration, can be overcome by increased force from the user when the opening angle of the two blades exceeds and / or falls below a certain threshold, referred to as the locking angle. The locking angle is preferably at least or exactly 60°, more preferably at least or exactly 70°, and particularly preferably at least or exactly 75°. The opening lock prevents the cutting tool from unintentionally reaching an undesired opening angle. In particular, the opening lock prevents the unintentional disassembly of the two blades and is to be considered a safety feature.

[0011] It can be practical if the cutting tool for achieving the opening lock comprises a spring element, preferably replaceable, and a deflection element, wherein the spring element is displaced by the deflection element against its spring force when the locking angle is exceeded and / or fallen below. Preferably, the spring element is rotationally fixed to one of the blades and the deflection element to the other blade. Preferably, the spring element returns to its initial position after the locking angle has been exceeded and / or fallen below. This type of opening lock allows the process to be repeated as often as desired. The spring element is, for example, a spring ring with a radially resilient projection that is displaced radially inwards or outwards by the deflection element against its spring force when the locking angle is exceeded and / or fallen below.This is a relatively small and inexpensive component that can be easily and simply replaced in case of wear and tear or improper use. The spring ring is preferably detachably arranged on one of the blades, and more preferably fixed in a receptacle on the outside of one of the blades, so that it can be replaced in the grinding configuration of the cutting tool.

[0012] It can be advantageous if the blades can only be separated and / or connected within an opening angle or range of opening angles of the two blades, referred to as the transition angle, wherein the transition angle is preferably larger than the locking angle, and wherein the transition angle is preferably at least or exactly 100°, more preferably at least or exactly 110°, and particularly preferably at least or exactly 115°. This prevents the two blades from unintentionally separating.

[0013] It can be advantageous for the cutting tool to include a connecting bolt that joins both blades in the cutting configuration, the connecting bolt preferably penetrating one or both blades, preferably in a direction perpendicular to the plane of each blade, and the connecting bolt particularly preferably forming the axis of rotation of the two blades in the cutting configuration. The connecting bolt can thus be easily assembled.

[0014] It can be advantageous if the connecting bolt for transferring the cutting tool from the cutting configuration to the grinding configuration is removable for at least one or both blades. This allows the cutting tool to be easily disassembled for grinding and / or polishing the blades, as well as for cleaning.

[0015] It can prove helpful if the connecting bolt has a key profile and one or both blades have a matching keyhole profile, whereby the key profile of the connecting bolt fits through the keyhole profile in just one rotational position or at least two spaced-apart rotational positions. Due to the matched key and keyhole profiles, the connecting bolt and the blades interact like a key and lock, so that the connecting bolt can be detached from or connected to one or both blades by passing the key profile through the keyhole profile(s).

[0016] It can be advantageous if both blades have a similar or identical keyhole profile, whereby the keyhole profiles of the two blades overlap only at one opening angle, or at least at two spaced-apart opening angles of the blades, such that the key profile of the connecting bolt fits through the keyhole profiles of the two blades. This measure can prevent the connecting bolt from unintentionally separating from the blades.

[0017] It can be advantageous if the connecting bolt in the cutting configuration is spring-loaded against at least one or both blades to generate the preload force. The spring-loaded connecting bolt, acting as a force-transmitting element, makes it particularly easy to spring-load the two blades against each other.

[0018] It can be advantageous if the connecting bolt is spring-loaded against one or both blades by means of a leaf spring or disc spring, the leaf spring or disc spring preferably extending in a plane parallel to the planes of the blades. The leaf / disc spring is simple and inexpensive to manufacture. Furthermore, a leaf / disc spring allows for a particularly compact design and easy assembly / disassembly of the cutting tool.

[0019] It may be useful if the connecting bolt has a spring end and a locking end, wherein the spring end springs towards the other blade on the outside of one of the two blades, wherein the locking end engages the other of the two blades in a form-fitting manner in the cutting configuration, wherein the locking end preferably has the keyhole profile according to claim 8 or 9.

[0020] It can prove advantageous if the connecting bolt incorporates the spring element or the deflection element according to claim 4. This allows the connecting bolt to perform several functions simultaneously, including serving as the pivot point for the cutting movement of the blades, generating the spring action perpendicular to the plane of the blades, and also providing the opening lock. This can reduce the number of components and the complexity of the cutting tool's design.

[0021] It can be advantageous if the connecting bolt is non-rotatably connected to one of the blades and rotatable relative to the other blade and / or axially immovable relative to one of the blades and axially movable relative to the other blade, wherein the connecting bolt is preferably rotatable relative to the blade relative to which it is axially immovable and / or non-rotatably connected to the blade relative to which it is axially movable.

[0022] Further advantageous developments result from combinations of the features disclosed herein. Brief description of the characters

[0023] They show: Fig. 1 The cutting tool according to the invention in the form of household scissors from different sides in a cutting configuration in which the two blades of the cutting tool are movable relative to each other for cutting a material, wherein the blades are in a closed position in the illustrated views (opening angle 0°), wherein view (a) shows a top view of the first blade (upper blade) of the scissors and view (b) shows a top view of the second blade (lower blade) of the scissors. Fig. 2 a perspective exploded view of the cutting tool according to the invention Fig. 1 including the associated fixing agents, looking at the outside of the first blade and the inside of the second blade. Fig. 3 another perspective exploded view of the first blade of the cutting tool according to the invention Fig. 1 with the fixing means assigned to this blade, looking at the inside of the first blade. Fig. 4 a perspective view of the first blade from Fig. 2 looking at their inside, the first blade being in the grinding configuration in which the first blade can be placed stably on a flat surface individually or independently of the second blade in order to maintain a constant working angle to the surface during a grinding process. Fig. 5 another perspective view of the first blade of the cutting tool according to the invention Fig. 4 looking at their inside. Fig. 6 a perspective exploded view of the first blade looking at its outside, analogous to the representation in Fig. 1, but enlarged and without the second blade. Fig. 7 A perspective exploded view of the second blade with the fixing means associated with this blade, looking at the outside of the second blade. Fig. 8 A perspective exploded view of the second blade with the fixing means associated with this blade, looking at the inside of the second blade. Fig. 9 the household scissors according to Fig. 1 in the cutting configuration with an opening angle or locking angle of the two blades of 75°. Fig. 10 the household scissors according to Fig. 1 and Fig. 9 in the cutting configuration with an opening angle or transition angle of the two blades of 115°. Fig. 11 a bottom view of an arrangement comprising the support cone of the second blade and the spring ring effecting the opening lock to illustrate the interaction with the connecting bolt (bayonet screw) not shown, which connects the two blades of the scissors in the cutting configuration and springs them against each other, wherein a head end of the connecting bolt is rotatably received in a receptacle in the support cone in the form of a rounded rectangle. Fig. 12 a perspective bottom view of the arrangement from Fig. 11 Fig. 13 a semi-transparent representation of a section of the cutting tool according to the invention Fig. 1 with a view to the support cone of the second blade, wherein the rotation of the connecting bolt in the area of ​​the narrowed cross-section of the spring ring is shown, wherein a deflection section of the connecting bolt interacts with the radially inwardly projecting projections of the spring ring at an opening angle or locking angle of the two blades of 75°, so that when the opening angle or locking angle of the two blades is exceeded, the spring ring is expanded against its spring force by increased force so that the deflection section of the connecting bolt can pass through. Fig. 14 a sectional view of a section of the cutting tool according to Fig. 1 and Fig. 13 in the cutting configuration along the axis of rotation of the connecting bolt, which represents the axis of rotation of the two blades in the cutting configuration. Fig. 15 a perspective view of the connecting bolt. Detailed description of the preferred embodiment

[0024] The preferred embodiment relates to a cutting tool 1 in the form of household scissors, as shown in the figures. Construction of the cutting tool 1

[0025] The scissors 1 comprise two blades 2, 3 which, in a cutting configuration of the cutting tool 1, are movable relative to each other in a known manner for cutting a material. Each of the blades 2, 3 comprises a blade 2b, 3b with a cutting edge 2a, 3a and, at the other end thereof, a ring serving as a handle 2c, 3c. Between the blade 2b, 3b and the respective handle 2c, 3c, each blade 2, 3 comprises a central opening 2d, 3d. This opening 2d, 3d serves as a lock and has a keyhole profile that is matched to a key profile of a connecting bolt 6 linking the blades 2, 3, as will be described below.

[0026] The design of the scissors 1 is well explained in the Fig. 2 to 4 can be identified. The central connecting element is the connecting bolt 6, which connects both blades 2, 3 in the cutting configuration and penetrates perpendicularly to the planes of the blades 2b, 3b to form the axis of rotation of the two blades 2, 3. In the cutting configuration, the connecting bolt 6 is spring-loaded against the outside of the upper blade 2 in the direction of the lower blade 2 by a leaf spring or disc spring 4c and is axially movable relative to the upper blade 2. The leaf / disc spring 4c extends in a plane parallel to the planes of the blades 2b, 3b and ensures a flat design of the scissors 1. The connecting bolt 6 is rotatable relative to the lower blade 3 and rotationally fixed to the upper blade 2.

[0027] As in Fig. As shown in Figure 15, the connecting bolt 6 comprises (from top to bottom) a simply stepped cylindrical section 6a with a stub-shaped conical end, a rotation-prevention section 6b with an outline in the form of a rectangle with rounded corners, an exactly or substantially cylindrical neck section 6c and a deflection section 6d which, corresponding to the rotation-prevention section 6b, has an outline in the form of a rectangle with rounded corners.

[0028] In the scissors 1 disclosed here, the blades 2, 3 are spring-loaded against each other in the cutting configuration in a direction perpendicular to the planes of the blade sections 2b, 3b. The preload force of the blades 2, 3 in the direction perpendicular to the planes of the blade sections 2b, 3b in the cutting configuration is approximately 1 to 5 N and is constant over the entire opening angle range from 0° to the so-called transition angle α2 of 115°, at which the blades can be detached / connected. The spring travel of the blades 2, 3 in a direction perpendicular to the planes of the blade sections 2b, 3b is in the range of approximately 0.1 to 0.5 mm in the cutting configuration.

[0029] The in Fig. The upper end of the connecting bolt 6 is positively pressed onto the cylindrical section 6a with an annular sleeve 4b, forming a spring-loaded end. In the cutting configuration, the upper end of the connecting bolt 6 and the sleeve 4b are concealed by a support cone 4a. The support cone 4a can be reversibly positively pressed onto the upper blade 2 and is held, for example, circumferentially in a hollow cylindrical receptacle on the outside of the upper blade 2. This support cone 4a, together with further support sections 2e, 2f on the handle 2a and on the back of the blade 2b, defines a support plane on which the upper blade 2 can be stably placed on a flat surface in the grinding configuration, so that the blade 2b is aligned exactly at an angle of 45° to the surface.In the cutting configuration, the spring-loaded end of the connecting bolt 6, connected to the sleeve 4b, springs towards the lower blade 3 and presses against the outside of the upper blade 2 (see . Fig. 14). The anti-rotation section 6b is fixed against rotation but axially displaceable in a complementary shaped receptacle on the inside of the first blade 2. By pressing the cylinder section 6a with the sleeve 4b and arranging the anti-rotation section 6b in the complementary receptacle, the connecting bolt 6 is fixed against rotation but axially movable over the spring travel of the leaf spring or disc spring 4c on the first blade 2.

[0030] The in Fig. The lower end of the connecting bolt 6 forms a locking end and engages the lower blade 3 in the cutting configuration with the deflection section 6d in a form-fitting manner. The deflection section 6d has a key profile that fits into the opening 3d of the lower blade 3. The lower support cone 5a, analogous to the upper support cone 4a, can be reversibly and force-fitted onto the lower blade 3 and can be fixed circumferentially in a hollow cylindrical receptacle on the outside of the lower blade 2. This support cone 3a, together with further support sections 3e, 3f on the handle 3a and on the back of the blade 3b, defines a support plane on which the lower blade 3, in the grinding configuration, can be placed stably on a flat surface, so that the blade 3b is aligned exactly at an angle of 45° to the surface. Transition from cutting configuration to grinding configuration

[0031] To transfer the cutting tool 1 from the cutting configuration to the grinding configuration, the support cones 4a, 5a are removable from the blades 2, 3, and the connecting bolt 6 is detachable from the lower blade 3. To prevent unintentional detachment of the connecting bolt 6 from the lower blade 3, the deflection section 6d of the connecting bolt 6 includes a key profile. The lower blade 3 has a corresponding, identical keyhole profile in the area of ​​the opening 3d, which aligns with the key profile of the connecting bolt 6 only at the opening angle α2 of 115° (see Figure 1). Fig. 10) is covered in such a way that the key profile of the connecting bolt 6 fits through the keyhole profile of the lower blade 3. Thus, the connecting bolt 6 can only be loosened or connected to the lower blade 3 at the transition angle by passing the key profile through the keyhole profile of the lower blade 3. The connecting bolt 6 effectively forms a bayonet screw. Opening lock

[0032] To prevent unintentional separation of the blades 2, 3, the scissors 1 have an opening lock which, in the cutting configuration, engages when exceeding or falling below an opening angle of 75°, referred to as the locking angle α1 (see figure). Fig. 9) of the two blades 2, 3 can be overcome by increased effort from a user.

[0033] To achieve the opening lock, the scissors 1 comprise a spring element 5b arranged in the lower blade 3 in a rotationally fixed manner and the deflection section 6d of the connecting bolt 6 as a deflection element 6d. These two elements interact in such a way that the spring element 5b, when the locking angle α1 is exceeded or falls below (see Figure 1), Fig. 9) is displaced from the deflection section 6d against its spring force and subsequently returns to its initial position. The spring element 5b is a spring ring 5b with two radially outwardly projecting projections, which are rotationally fixed in edge recesses of the lower support cone 5a, and two radially inwardly projecting projections, which are to be displaced radially outward by the deflection section 6d at the locking bolt when the locking angle α1 is exceeded and fallen below, so that the deflection section 6d passes through (cf. Fig. 11 to 13).

[0034] The spring element 5b is connected to the lower blade 3 in a rotationally fixed manner and is rotatable relative to the upper blade 2, while the deflection section 6d is connected to the upper blade 2 in a rotationally fixed manner and is rotatable relative to the lower blade 3.

[0035] The locking angle α1 is deliberately smaller than the transition angle α2. Therefore, starting from the closed position of the blades 2, 3 (opening angle of 0°), the opening lock (opening angle of 75°) must first be overcome in order to reach the transition angle α2 (opening angle of 115°). Grinding and polishing processes

[0036] As described above, the scissors 1 can be reversibly converted from their assembled state or cutting configuration to a disassembled state or grinding configuration. In this so-called grinding configuration, the blades 2, 3 are separated from each other for grinding and polishing their respective cutting edges 2a, 3a using a grinding or polishing device, in particular a roller sharpener. For grinding and polishing, each of the blades 2, 3 can be placed individually and stably on a flat surface, such that the blade section 2b, 3b of the blade 2, 3 is aligned at a constant working angle of preferably 45° to the surface. During grinding and polishing, the blade 2, 3 is stabilized with one hand, and the cutting edge 2a, 3a of this blade 2, 3 can be ground / polished with the roller sharpener using the other hand.

[0037] The grinding and polishing of the two blades 2, 3 is not the main focus of the invention in this application. Reference is made in this regard to WO 2022 / 233998 A1. Assembly of the scissors 1

[0038] First, the connecting bolt 6 is inserted from the inner sides through the respective openings 2d, 3d of the blades 2, 3, as shown in Fig. Figure 2 shows the cylinder section 6a with its truncated cone end projecting towards the outside of the first blade 2, the anti-rotation section 6b is located in the complementary shaped receptacle on the inside of the first blade 2, and the deflection section 6d is arranged on the outside of the second blade 3. The leaf / disc spring 4c, which provides the preload, and a sleeve 4b are then attached to the outside of the first blade 2. The sleeve 4b is connected to the end of the connecting bolt 6 by friction and / or positive locking, in particular by crimping. Finally, the support cone 4a is placed on the first blade 2 as a cap and connected to it by friction and / or positive locking.

[0039] On the outside of the second blade 3 an arrangement comprising the spring ring 5b and the support cone 5a (cf. Fig. 11-12), is attached by friction and / or form locking, so that the deflection section 6d projecting towards the outside of the second blade 3 is in the plane of the spring ring 5b and cooperates with it to achieve the opening lock (cf. Fig. 11-14). The connecting bolt 6, which penetrates the second blade 3, can move axially with the second blade 3 over a spring travel of approximately 0.1 to 0.5 mm relative to the upper blade 2 due to the leaf / disc spring 4c. The connecting bolt 6 is rotationally fixed to the upper blade 2 and rotatable relative to the lower blade 3. Advantages of the described embodiment

[0040] An important feature of the disclosed scissors 1 is that the two blades 2, 3 or scissor halves of the disclosed scissors 1 can be separated without tools after overcoming the opening lock at an opening angle or locking angle α1 of 75° when reaching the opening angle or transition angle α2 of 115° and can later be rejoined.

[0041] With a locking angle α1 of 75°, the opening lock must first be overcome with increased force in order to open the scissors 1 further. Only with a transition angle α2 of 115° can the blades 2, 3 or scissor halves be separated.

[0042] The separate blades 2, 3 or scissor halves stand independently and stably on a flat surface in the grinding configuration even without a grinding guide, so that the blade 2b, 3b is aligned at a 45° angle to the surface and the cutting edge 2c, 3c of each blade 2, 3 can be resharpened at a perfect 45° angle with a roller sharpener, as known from EP 3 278 928 A2 or WO 2022 / 233998 A1.

[0043] The ground blades 2, 3, or scissor halves, can then be transferred from the grinding configuration back to the cutting configuration. For this, the components of the scissors 1 are in the configuration described above and in Fig. 2. To assemble as shown.

[0044] The burrs formed during the grinding of the cutting edges 2c, 3c shear off automatically during the first one to two cutting movements due to the spring-like preload of the two blades 2, 3 in the cutting configuration as described above.

[0045] The special feature of the scissors 1 revealed here lies in the novel, spring-loaded, and self-adjusting locking system, which holds the two blades 2 and 3, or scissor halves, together in the cutting configuration with a defined force. At an opening angle of 75 degrees, the opening lock must be overcome with slightly increased force to open the scissors further, so that the scissor halves can be separated at an opening angle of 115 degrees.

[0046] The locking bolt 6, which serves as a bayonet screw, rotates in the support cone 5a of the lower blade (Unterbeck) 3 and interacts with the spring ring 5b, which is fixedly mounted in the support cone 5a of the lower blade (Unterbeck) 3. In the normal operating range (from 0 to approximately 70 degrees opening angle), the deflection element 6d of the locking bolt 6 does not contact the radially inwardly projecting projections of the spring ring 5b. From a scissor opening angle of 75 degrees, the deflection element 6d of the locking bolt 6 must overcome the radially inwardly projecting projections of the spring ring 5b. Fig. 13). Reference symbol list 1 cutting tool 2 First Blade (Oberbeck) 2a Cutting edge 2b Blade 2c handle 2D opening (eye) 2nd support section (handle side) 2f Support section (blade side) 3 Second Blade (Unterbeck) 3a Cutting edge 3b Blade 3c handle 3D opening (eye) 3rd support section (handle side) 3f Support section (blade side) 4 Fixatives (upper side) 4a Support cone 4b sleeve 4c spring 4D shim 4e shim 5 Fixatives (bottom side) 5a Support cone 5b Spring element (spring ring) opening lock 6 connecting bolts 6a Cylinder section 6b Rotation lock section 6c Neck section 6d Deflection section (key profile) α Opening angle α1 Locking angle α2 transition angle

Claims

[1] Cutting tool (1), in particular scissors, comprising: two blades (2, 3) each having a cutting edge (2a, 3a) which are movable relative to each other in a cutting configuration of the cutting tool (1) for cutting a material, wherein the cutting tool (1) is reversibly convertible from the cutting configuration to a grinding configuration in which the blades (2, 3) are connected to a grinding or polishing tool for grinding and / or polishing one or both of the cutting edges (2a, 3a).Polishing device (5), in particular with a roller grinder (5), are separated from each other, wherein the cutting tool (1) comprises a connecting bolt (6) which connects both blades (2, 3) in the cutting configuration, wherein the connecting bolt (6) is detachable for transferring the cutting tool (1) from the cutting configuration to the grinding configuration of at least one of the two blades (2, 3) or of both blades (2, 3), wherein at least one of the blades (2, 3) can be placed individually and stably on a flat surface, preferably such that the blade blade (2b, 3b) of the blade (2, 3) is aligned at a constant working angle of preferably 45° to the surface. characterized bythat the blades (2, 3) are spring-loaded against each other in the cutting configuration, wherein the connecting bolt (6) is spring-loaded against at least one of the two blades (2, 3) or against both blades (2, 3) in the cutting configuration to generate the preload force, wherein the cutting tool (1) has an opening lock which, in the cutting configuration, when exceeding and / or falling below an opening angle (α) of the two blades (2, 3) designated as the locking angle (α1), must be overcome by increased force exerted by a user, wherein the cutting tool (1) comprises a spring element (5b) and a deflection element (6d) to effect the opening lock, wherein the spring element (5b) is displaced by the deflection element (6d) against its spring force when exceeding and / or falling below the locking angle (α1), wherein the connecting bolt (6) connects the spring element (5b) or the deflection element (6d) exhibits. [2] Cutting tool (1) according to the preceding claim, characterized by , that the blades (2, 3) in the cutting configuration are springily pre-tensioned against each other in a direction perpendicular to the planes of the blade blades (2b, 3b). [3] Cutting tool (1) according to any one of the preceding claims, characterized by that the locking angle (α1) is at least or exactly 60°, preferably at least or exactly 70°, particularly preferably at least or exactly 75°. [4] Cutting tool (1) according to any one of the preceding claims, characterized by , that the spring element (5b) is connected to one of the blades (2, 3) and the deflection element (6d) is connected to the other blade (2, 3) in a rotationally fixed manner, wherein preferably the spring element (5b) returns to its initial position after exceeding and / or falling below the locking angle (α1). [5] Cutting tool (1) according to any one of the preceding claims, characterized by, that the blades (2, 3) are only detachable from each other and / or connectable to each other in an opening angle (α) or opening angle range of the two blades (2, 3) referred to as the transition angle (α2), wherein the transition angle (α2) is preferably larger than the locking angle (α1), wherein the transition angle (α2) is preferably at least or exactly 100°, preferably at least or exactly 110°, particularly preferably at least or exactly 115°. [6] Cutting tool (1) according to any one of the preceding claims, characterized by that the connecting bolt (6) penetrates one of the blades (2, 3) or both blades (2, 3), preferably in a direction perpendicular to the plane of the blade blade (2b, 3b), wherein the connecting bolt (6) particularly preferably forms the axis of rotation of the two blades (2, 3) in the cutting configuration. [7] Cutting tool (1) according to any one of the preceding claims, characterized by, that the connecting bolt (6) has a key profile and one or both blades (2, 3) have a matching keyhole profile, wherein the key profile of the connecting bolt (6) fits through the keyhole profile in only one rotational position or at least two rotational positions spaced apart from each other. [8] Cutting tool (1) according to the preceding claim, characterized by , that both blades (2, 3) have a similar or identical keyhole profile, wherein the keyhole profiles of the two blades (2, 3) overlap only at one opening angle or at least two spaced-apart opening angles of the blades such that the key profile of the connecting bolt (6) fits through the keyhole profiles of the two blades (2, 3). [9] Cutting tool (1) according to any one of the preceding claims, characterized by, that the connecting bolt (6) is resiliently pre-tensioned against one of the two blades (2, 3) or against both blades (2, 3) by means of an intermediate leaf spring or disc spring (4c), wherein the leaf spring or disc spring (4c) preferably extends in a plane parallel to the planes of the blade blades (2b, 3b). [10] Cutting tool (1) according to any one of the preceding claims, characterized by , that the connecting bolt (6) has a resilient end (6a) and a locking end (6d), wherein the resilient end (6a) resiliently presses towards the other blade (2, 3) on the outside of one of the two blades (2, 3), wherein the locking end (6d) positively engages the other of the two blades (2, 3) in the cutting configuration, wherein the locking end (6d) preferably has the keyhole profile according to claim 8 or 9. [11] Cutting tool (1) according to any one of the preceding claims, characterized by, that the connecting bolt (6) is connected to one of the blades (2) in a rotationally fixed manner and is rotatable relative to the other blade (3) and / or is axially immovable relative to one of the blades (3) and axially movable relative to the other blade (2), wherein the connecting bolt (6) is preferably rotatable relative to that blade (3) relative to which it is axially immovable and / or is connected to that blade (2) in a rotationally fixed manner relative to which it is axially movable.

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