Cutting tool, in particular shears or scissors, with blades which are resiliently prestressed with respect to one another

Abstract

The present invention relates to a cutting tool (1), in particular shears or scissors, comprising: two blades (2, 3), each having a cutting edge (2a, 3a), which, in a cutting configuration of the cutting tool (1), can be moved relative to one another for cutting a material, wherein the cutting tool (1) can be reversibly transferred from the cutting configuration into a grinding configuration, in which the blades (2, 3) have been separated from one another for the grinding and / or polishing of one of or both the cutting edges (2a, 3a) by a grinding and / or polishing device (5), in particular by a cylindrical grinder (5), wherein at least one of the blades (2, 3) or both blades (2, 3) can each be placed individually and stably on a flat base (U), preferably in such a way that the blade (2, 3) is oriented at a constant working angle (α) to the base (U). In order that the cutting edges (2a, 3a) can deburr themselves after grinding and / or polishing, it is provided according to the invention that, in the cutting configuration, the blades (2, 3) are resiliently prestressed with respect to one another.

Description

[0001] Cutting tool, especially scissors, with spring-loaded blades

[0002] The present invention relates to a cutting tool, in particular a pair of scissors, comprising: two blades, each having a cutting edge, which are movable relative to one another in a cutting configuration of the cutting tool for cutting a material, wherein the cutting tool is reversibly transferable from the cutting configuration into a grinding configuration in which the blades are separated from one another for grinding and / or polishing one of the or both cutting edges with a grinding or polishing device, in particular with a roller grinder, wherein at least one of the blades or both blades can be placed individually and stably on a flat base, so that the blade is aligned at a constant working angle to the base.

[0003] Such a cutting tool is known from WO 2022 / 233998 A1.

[0004] Experience with the cutting tool known from the state of the art has shown that burrs can form on the cutting edge during grinding and / or polishing, which may impair the cutting movement of the two blades when the cutting tool is returned to its cutting configuration. To enable the usual high-quality cutting performance again, the blades must be deburred separately after grinding and / or polishing.

[0005] The present invention is based on the object of remedying this problem and improving a cutting tool of the type mentioned at the outset in order to facilitate the use of the cutting tool, which has been converted back into the cutting configuration, following a grinding and / or polishing operation.

[0006] The object of the invention is achieved by the subject matter of claim 1.

[0007] Disclosed is a cutting tool, in particular scissors, comprising: two blades, each having a cutting edge, which are movable relative to one another in a cutting configuration of the cutting tool for cutting a material, wherein the cutting tool is reversibly transferable from the cutting configuration into a grinding configuration in which the blades are separated from one another for grinding and / or polishing one of the or both cutting edges using a grinding or polishing device, in particular a roller grinder, wherein at least one of the blades or both blades can be placed individually and stably on a flat base, preferably in such a way that the blade edge of the blade is aligned at a constant working angle of preferably 45° to the base, wherein the blades are resiliently pretensioned against one another in the cutting configuration.

[0008] The pre-tension acting between the blades presses the blades against each other with a defined amount of force during the cutting movement, so that the cutting edges deburr themselves in one or two opening and closing movements. The spring-loaded pre-tension of the two blades can also reduce the risk of the cutting edges being damaged when cutting a hard object. This is because the blades are then able to spring back and are thus protected from damage. The spring-loaded pre-tension allows the blades to be pushed apart and tilted slightly. This type of stress on the blades does not usually occur during a normal cutting process. However, when cutting materials that could damage the cutting edges, the blades can move apart, clamping the material to be cut between the two blades.This can be viewed as a safety feature for the cutting edges. Before the cutting edges are severely damaged, the material to be cut is clamped between the blades. Due to the pre-tensioning of both blades, the scissors can start cutting as soon as the cutting edges touch, unlike many competitors' solutions. Regardless of how much material was removed during grinding, the cutting tool readjusts itself due to the spring pre-tension. The closing force of the cutting tool is then preferably constant over the entire length of the cutting edge. Since the blades only need to be minimally aligned and twisted towards each other in the cutting area due to the spring pre-tension, there is no noticeable increase in cutting force when the blades are closed. A further advantage of the spring pre-tensioning of both blades is that the blades do not rattle in the cutting configuration, as the spring pre-tensioning force presses the two blades together.

[0009] It may be advantageous if the blades are resiliently pre-tensioned against each other in the cutting configuration, preferably in a direction perpendicular to the planes of the blades, preferably such that at least one of the following conditions is met:

[0010] - a pretensioning force of the blades, preferably in a direction perpendicular to the planes of the blades in the cutting configuration is in the range of 1 N to 10 N, preferably in the range of 2 N to 6 N, preferably in the range of 3 N to 5 N.

[0011] - a pre-tensioning 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 pre-tensioning force preferably does not deviate from an average value by more than + / - 10%, preferably + / - 5%, over the entire opening angle range.

[0012] - a spring deflection of the blades in / against the preload force, preferably in a direction perpendicular to the planes of the blades, in the cutting configuration is in the range from 0.1 to 2.0 mm, preferably in the range from 0.2 to 1.5 mm, more preferably in the range from 0.3 to 1.0 mm. With the parameters mentioned, advantageous results were achieved in tests. A constant spring force over a large opening angle range is particularly advantageous because the cutting edges can then deburr themselves completely and evenly over the entire cutting length during the opening and closing movement, and because this allows a particularly good cutting result to be achieved.

[0013] It can prove useful if the cutting tool has an opening lock, which, in the cutting configuration, can be overcome by the user applying increased force when the two blades are opened above and / or below an opening angle referred to as the locking angle. The locking angle is preferably at least or exactly 60°, preferably at least or exactly 70°, particularly preferably at least or exactly 75°. The opening lock can prevent the cutting tool from inadvertently reaching an undesired opening angle. In particular, the opening lock prevents accidental disassembly of the two blades and is considered a safety feature.

[0014] It can be practical if the cutting tool comprises a preferably replaceable spring element and a deflection element to achieve the opening lock, wherein the spring element is displaced by the deflection element against its spring force when the locking angle is exceeded and / or fallen below, wherein the spring element is preferably connected in a rotationally fixed manner to one of the blades and the deflection element to the other blade, wherein the spring element preferably returns to its starting position after the locking angle is exceeded and / or fallen below. This type of opening lock allows the process to be repeated as often as required. The spring element is, for example, a spring ring with a radial spring projection which is displaced radially inwards or outwards against its spring force by the deflection element when the locking angle is exceeded and / or fallen below.This is a comparatively small and inexpensive component that can be easily and simply replaced in the event of wear or improper use. The spring ring is preferably detachably mounted on one of the blades, preferably non-rotatably mounted in a recess on the outside of one of the blades, so that it can be replaced in the grinding configuration of the cutting tool.

[0015] It may prove useful if the blades can be detached from one another and / or connected to one another only within an opening angle or opening angle range of the two blades referred to as the transfer angle, wherein the transfer angle is preferably greater than the locking angle, wherein the transfer angle is preferably at least or exactly 100°, preferably at least or exactly 110°, particularly preferably at least or exactly 115°. This can prevent unintentional detachment of the two blades. It may be expedient if the cutting tool comprises a connecting bolt that connects both blades in the cutting configuration, wherein the connecting bolt preferably penetrates one of the blades or both blades, preferably in a direction perpendicular to the plane (of each) of the blade blade, wherein the connecting bolt particularly preferably forms the axis of rotation of the two blades in the cutting configuration.The connecting bolt can be easily installed in this way.

[0016] It can be useful if the connecting bolt for transferring the cutting tool from the cutting configuration to the grinding configuration can be removed from at least one of the two blades or from both blades. This allows the cutting tool to be easily disassembled for grinding and / or polishing the blades, as well as for cleaning, for example.

[0017] It can prove helpful if the connecting bolt has a key profile and one or both of the blades has / have a matching keyhole profile, whereby the key profile of the connecting bolt fits through the keyhole profile in only one rotational position or at least two spaced-apart rotational positions. Due to the coordinated 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 one or both of the blades or connected to one or both of the blades by passing the key profile through the keyhole profile(s).

[0018] It can be advantageous if both blades have a similar or identical keyhole profile, with the keyhole profiles of the two blades overlapping 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 fits through the keyhole profiles of the two blades. This measure can prevent the connecting bolt from accidentally separating from the blades.

[0019] It can be practical if the connecting bolt is spring-loaded against at least one of the two blades or both blades in the cutting configuration to generate the preload force. The spring-loaded connection bolt acts as a force-transmitting element, making it particularly easy to spring-load the two blades against each other.

[0020] It can prove advantageous if the connecting bolt is resiliently preloaded against one of the two blades or against both blades with the interposition of a leaf spring or disc spring, wherein the leaf spring or disc spring preferably extends in a plane parallel to the planes of the blade blades. The leaf / disc spring is simple and inexpensive to manufacture. Furthermore, a leaf / disc spring enables a particularly compact design and simple assembly / disassembly of the cutting tool. It can be useful if the connecting bolt has a resilient end and a locking end, wherein the resilient end presses resiliently against the outside of one of the two blades in the direction of the respective other blade, wherein the locking end positively engages behind the other of the two blades in the cutting configuration, wherein the locking end preferably has the keyhole profile according to claim 8 or 9.

[0021] It may prove advantageous if the connecting bolt comprises the spring element or the deflection element according to claim 4. The connecting bolt can thus fulfill several functions simultaneously, including serving as a rotation axis 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.

[0022] It may be advantageous if the connecting bolt is connected to one of the blades in a rotationally fixed manner and is rotatable relative to the other blade and / or is 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 is connected to the blade relative to which it is axially movable in a rotationally fixed manner.

[0023] Further advantageous developments result from combinations of the features disclosed herein

[0024] Short description of the characters

[0025] They show:

[0026] Fig. 1 shows 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 views shown (opening angle 0°), wherein view (a) shows a plan view of the first blade (upper blade) of the scissors and view (b) shows a plan view of the second blade (lower blade) of the scissors.

[0027] Fig. 2 is a perspective exploded view of the cutting tool according to the invention shown in Fig. 1 including the associated fixing means, looking at the outside of the first blade and the inside of the second blade.

[0028] Fig. 3 is another perspective exploded view of the first blade of the cutting tool according to the invention according to Fig. 1 with the fixing means associated with this blade, looking towards the inside of the first blade.

[0029] Fig. 4 is a perspective view of the first blade of Fig. 2, looking at its inside, wherein the first blade is 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.

[0030] Fig. 5 is another perspective view of the first blade of the cutting tool according to the invention according to Fig. 4, looking towards its inside.

[0031] Fig. 6 is an exploded perspective view of the first blade looking at its outer side, similar to the illustration in Fig. 1, but enlarged and without the second blade.

[0032] Fig. 7 is an exploded perspective view of the second blade with the fixing means associated with this blade, looking towards the outside of the second blade.

[0033] Fig. 8 is an exploded perspective view of the second blade with the fixing means associated with this blade, looking towards the inside of the second blade.

[0034] 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°.

[0035] Fig. 10 the household scissors according to Fig. 1 and 9 in the cutting configuration with an opening angle or transfer angle of the two blades of 115°.

[0036] Fig. 11 is a bottom view of an arrangement comprising the support cone of the second blade and the spring ring which effects the opening lock to explain the interaction with the connecting bolt (bayonet screw) not shown, which connects the two blades of the scissors in the cutting configuration and resiliently preloads them against each other, wherein a head end of the connecting bolt can be received in a receptacle in the support cone in the form of a rounded rectangle in a rotationally fixed manner.

[0037] Fig. 12 is a perspective bottom view of the arrangement of Fig. 11

[0038] Fig. 13 is a semi-transparent representation of a section of the cutting tool according to the invention according to Fig. 1 with a view of the support cone of the second blade, wherein the rotation of the connecting bolt is shown in the region of the narrowed cross section of the spring ring, 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 the spring ring is widened against its spring force by increased force when the opening angle or locking angle of the two blades is exceeded, so that the deflection section of the connecting bolt fits through.

[0039] Fig. 14 is a sectional view of a section of the cutting tool according to Figs. 1 and 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.

[0040] Fig. 15 a perspective view of the connecting bolt.

[0041] Detailed description of the preferred embodiment The preferred embodiment relates to a cutting tool 1 in the form of household scissors, as shown in the figures.

[0042] Structure of the cutting tool 1

[0043] The scissors 1 comprise two blades 2, 3, which are movable relative to one another in a known manner when the cutting tool 1 is in a cutting configuration 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 connecting the blades 2, 3, as will be described below.

[0044] The structure of the scissors 1 can be clearly seen in Fig. 2 to 4. The central connecting element is the connecting bolt 6, which connects both blades 2, 3 in the cutting configuration and penetrates perpendicular 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 via a leaf spring or disc spring 4c and is movable in the axial direction 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 is connected to the upper blade 2 in a rotationally fixed manner.

[0045] As shown in Fig. 15, the connecting bolt 6 comprises (from top to bottom) a simply stepped cylinder section 6a with a truncated cone-shaped end, an anti-rotation section 6b with an outline in the shape of a rectangle with rounded corners, an exactly or substantially cylindrical neck section 6c and a deflection section 6d which, corresponding to the anti-rotation section 6b, has an outline in the shape of a rectangle with rounded corners.

[0046] In the scissors 1 disclosed here, the blades 2, 3 are resiliently preloaded against one another in the cutting configuration in a direction perpendicular to the planes of the blades 2b, 3b. The preload force of the blades 2, 3 in the direction perpendicular to the planes of the blades 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 a2 of 115°, at which the blades are detachable / connectable. The spring travel of the blades 2, 3 in a direction perpendicular to the planes of the blades 2b, 3b in the cutting configuration is in the range of approximately 0.1 to 0.5 mm. The upper end of the connecting bolt 6 in Fig. 2 is force-fitted to the cylinder section 6a with an annular sleeve 4b and forms a resilient end. In the cutting configuration, the upper end of the connecting bolt 6 and the sleeve 4b are covered by a support cone 4a.The support cone 4a can be reversibly and force-fitted 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, in the grinding configuration, can be stably placed on a flat surface, so that the blade 2b is aligned at an exact angle of 45° to the surface. In the cutting configuration, the spring-loaded end of the connecting bolt 6, connected to the sleeve 4b, presses resiliently toward the lower blade 3 onto the outside of the upper blade 2 (see Fig. 14). The anti-rotation section 6b is located in a complementarily shaped receptacle on the inside of the first blade 2, rotationally fixed but axially movable.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 to the first blade 2 in a rotationally fixed manner but movable in the axial direction via the spring travel of the leaf spring or disc spring 4c.

[0047] The lower end of the connecting bolt 6 in Fig. 2 represents 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 the key profile that fits into the opening 3d of the lower blade 3. The lower support cone 5a can be reversibly and force-fitted onto the lower blade 3 in a similar way to the upper support cone 4a and can be secured circumferentially in a hollow cylindrical receptacle on the outside of the lower blade 2. This support cone 3a then defines, together with further support sections 3e, 3f on the handle 3a and on the back of the blade 3b, a support plane on which the lower blade 3 can be stably placed on a flat surface in the grinding configuration, so that the blade 3b is aligned exactly at an angle of 45° to the surface.

[0048] Transfer from the cutting configuration to the grinding configuration

[0049] 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 accidental detachment of the connecting bolt 6 from the lower blade 3, the deflection section 6d of the connecting bolt 6 comprises a key profile. The lower blade 3 has a matching, identical keyhole profile in the area of ​​the opening 3d, which overlaps with the key profile of the connecting bolt 6 only at the opening angle a2 of 115° (see Fig. 10), referred to as the transfer angle, such 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 released or connected to the lower blade 3 in the transfer angle by passing the key profile through the keyhole profile of the lower blade 3.The connecting bolt 6 essentially forms a bayonet screw.

[0050] Opening lock

[0051] In order to avoid an unintentional separation of the blades 2, 3, the scissors 1 have an opening lock which, in the cutting configuration, must be overcome by increased force exerted by a user when exceeding or falling below an opening angle of 75°, referred to as the locking angle cd (cf. Fig. 9), of the two blades 2, 3.

[0052] 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 the deflection element 6d. These two elements interact in such a way that the spring element 5b is displaced by the deflection section 6d against its spring force when the locking angle cd is exceeded or undershot (see Fig. 9) and then returns to its original position. The spring element 5b here is a spring ring 5b with two radially outwardly projecting projections, which are rotationally fixedly received in edge-side 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 on the locking bolt when the locking angle cd is exceeded or undershot, so that the deflection section 6d fits through (see Figs. 11 to 13).

[0053] For this purpose, 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.

[0054] The locking angle cd is intentionally smaller than the transfer angle a2. Therefore, 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 transfer angle a2 (opening angle of 115°).

[0055] Grinding and polishing

[0056] As described above, the scissors 1 can be reversibly converted from the assembled state or cutting configuration into a disassembled state or grinding configuration. In this so-called grinding configuration, the blades 2, 3 are separated from one another for grinding and polishing the respective cutting edges 2a, 3a using a grinding or polishing device, in particular a roller grinder. For grinding and polishing, each of the blades 2, 3 can be placed individually and stably on a flat surface so that the blade edge 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 other hand using the roller grinder.

[0057] The grinding and polishing of the two blades 2, 3 is not the focus of the invention in this application. Reference is made to WO 2022 / 233998 A1 in this regard.

[0058] Assembly of the scissors 1

[0059] First, the connecting bolt 6 is inserted from the inside through the respective openings 2d, 3d of the blades 2, 3, as shown in Fig. 2, so that the cylindrical section 6a with the truncated cone end protrudes towards the outside of the first blade 2, the anti-rotation section 6b is located in the complementarily 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. Subsequently, the leaf / disc spring 4c, which is responsible for the preload, and a sleeve 4b are inserted from the outside of the first blade 2. The sleeve 4b is connected, in particular pressed, to the end of the connecting bolt 6 in a force-fitting and / or form-fitting manner. Subsequently, the supporting cone 4a is placed onto the first blade 2 as a cap and connected to the first blade 2 in a force-fitting and / or form-fitting manner.

[0060] An assembly comprising the spring ring 5b and the support cone 5a (cf. Fig. 11-12) is non-positively and / or positively fastened to the outside of the second blade 3, such that the deflection section 6d projecting toward the outside of the second blade 3 is located in the plane of the spring ring 5b and cooperates with it to effect the opening lock (cf. Fig. 11-14). The connecting bolt 6 penetrating the second blade 3 can move, together with the second blade 3, in the axial direction relative to the upper blade 2 over a spring travel of approximately 0.1 to 0.5 mm thanks to the leaf / disc spring 4c. The connecting bolt 6 is connected to the upper blade 2 in a rotationally fixed manner and is rotatable relative to the lower blade 3.

[0061] Advantages of the described embodiment

[0062] 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 a1 of 75° upon reaching the opening angle or transition angle a2 of 115° and later reassembled. At a locking angle a1 of 75°, the opening lock must first be overcome with increased force in order to open the scissors 1 further. Only at a transition angle a2 of 115° can the blades 2, 3 or scissor halves be separated.

[0063] In the grinding configuration, the separated blades 2, 3 or scissor halves stand independently and stably on a flat surface even without a grinding gauge, 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 reground at a perfect 45° angle with a roller grinder, as known from EP 3278928 or WO 2022 / 233998 A1.

[0064] The ground blades 2, 3, or scissor halves, can then be converted from the grinding configuration back to the cutting configuration. To do this, the components of scissors 1 must be assembled as described above and shown in Fig. 2.

[0065] The burrs created during grinding of the cutting edges 2c, 3c are sheared off automatically during the first one or two cutting movements due to the spring pre-tension of the two blades 2, 3 in the cutting configuration due to the structure described above.

[0066] The special feature of the scissors 1 disclosed here lies in the innovative, spring-loaded, self-adjusting locking system, which holds the two blades 2, 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 somewhat increased force to open the scissors further, allowing the scissor halves to be separated at an opening angle of 115 degrees.

[0067] The locking bolt 6, which serves as a bayonet screw, rotates in the support cone 5a of the lower blade (lower blade) 3 and interacts with the spring washer 5b, which is non-rotatably mounted in the support cone 5a of the lower blade (lower blade) 3. In the normal range of use (from 0 to approximately 70 degrees of opening angle), the deflection element 6d of the locking bolt 6 does not touch the radially inwardly projecting projections of the spring washer 5b. Starting at 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 washer 5b (Fig. 13). List of Reference Symbols

[0068] 1 cutting tool

[0069] 2 First Blade (Oberbeck)

[0070] 2a cutting edge

[0071] 2b blade

[0072] 2c handle

[0073] 2d opening (eye)

[0074] 2nd support section (handle side)

[0075] 2f support section (blade side)

[0076] 3 Second Blade (Unterbeck)

[0077] 3a Cutting edge

[0078] 3b blade

[0079] 3c handle

[0080] 3d opening (eye)

[0081] 3e support section (handle side)

[0082] 3f support section (blade side)

[0083] 4 Fixatives (upper pelvic side)

[0084] 4a Support cone

[0085] 4b sleeve

[0086] 4c spring

[0087] 4d shim

[0088] 4th shim

[0089] 5 Fixatives (lower pelvic side)

[0090] 5a Support cone

[0091] 5b Spring element (spring ring) opening lock

[0092] 6 connecting bolts

[0093] 6a Cylinder section

[0094] 6b Anti-rotation section

[0095] 6c neck section

[0096] 6d Deflection section (key profile) a Opening angle a1 Locking angle a2 Transfer angle

Claims

Claims 1. Cutting tool (1), in particular scissors, comprising: two blades (2, 3), each with a cutting edge (2a, 3a), which are movable relative to one another in a cutting configuration of the cutting tool (1) for cutting a material, wherein the cutting tool (1) is reversibly transferable from the cutting configuration into a grinding configuration, in which the blades (2, 3) are separated from one another for grinding and / or polishing one of the or both cutting edges (2a, 3a) with a grinding or polishing device (5), in particular with a roller grinder (5), wherein at least one of the blades (2, 3) can be placed individually and stably on a flat base, preferably in such a way that the blade surface (2b, 3b) of the blade (2, 3) is aligned at a constant working angle of preferably 45° to the base, characterized in that the blades (2, 3) are resiliently pretensioned against one another in the cutting configuration.

2. Cutting tool (1) according to the preceding claim, characterized in that the blades (2, 3) in the cutting configuration are resiliently prestressed against one another in a direction perpendicular to the planes of the blade leaves (2b, 3b).

3. Cutting tool (1) according to one of the preceding claims, characterized in that the cutting tool (1) has an opening lock which, in the cutting configuration, can be overcome by increased force exertion by a user when an opening angle (a) of the two blades (2, 3) is exceeded and / or falls below, referred to as the locking angle (a1), wherein the locking angle (cd) is preferably at least or exactly 60°, preferably at least or exactly 70°, particularly preferably at least or exactly 75°.

4. Cutting tool (1) according to the preceding claim, characterized in that the cutting tool (1) comprises a spring element (5b) and a deflection element (6d) for effecting the opening lock, wherein the spring element (5b) is displaced by the deflection element (6d) against its spring force when the locking angle (cd) is exceeded and / or fallen below, wherein preferably the spring element (5b) is connected in a rotationally fixed manner to one of the blades (2, 3) and the deflection element (6d) is connected to the other blade (2, 3), wherein preferably the spring element (5b) returns to its starting position after the locking angle (cd) is exceeded and / or fallen below.

5. Cutting tool (1) according to one of the preceding claims, characterized in that the blades (2, 3) are detachable from one another and / or connectable to one another only in an opening angle (a) or opening angle range of the two blades (2, 3) referred to as the transfer angle (a2), wherein the transfer angle (a2) is preferably greater than the locking angle (a1), wherein the transfer angle (a2) 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 one of the preceding claims, characterized in that the cutting tool (1) comprises a connecting bolt (6) which connects both blades (2, 3) in the cutting configuration, wherein the connecting bolt (6) preferably 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 the preceding claim, characterized in that the connecting bolt (6) for transferring the cutting tool (1) from the cutting configuration to the grinding configuration is detachable from at least one of the two blades (2, 3) or from both blades (2, 3).

8. Cutting tool (1) according to the preceding claim, characterized in that the connecting bolt (6) has a key profile and one of the blades (2, 3) or both blades (2, 3) has / 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 spaced-apart rotational positions.

9. Cutting tool (1) according to the preceding claim, characterized in 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).

10. Cutting tool (1) according to one of the four preceding claims, characterized in that the connecting bolt (6) in the cutting configuration for producing the Preload force is resiliently preloaded against at least one of the two blades (2, 3) or against both blades (2, 3).

11. Cutting tool (1) according to the preceding claim, characterized in that the connecting bolt (6) is resiliently prestressed against one of the two blades (2, 3) or against both blades (2, 3) with the interposition of a 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 leaves (2b, 3b).

12. Cutting tool (1) according to one of the six preceding claims, characterized in that the connecting bolt (6) has a resilient end (6a) and a locking end (6d), wherein the resilient end (6a) presses resiliently in the direction of the respective other blade (2, 3) onto the outside of one of the two blades (2, 3), wherein the locking end (6d) positively engages behind 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.

13. Cutting tool (1) according to one of the seven preceding claims, characterized in that the connecting bolt (6) has the spring element (5b) or the deflection element (6b) according to claim 4.

14. Cutting tool (1) according to one of the eight preceding claims, characterized in 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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