Magnetic sharpening jig comprising a multi-part, hollow body

Abstract

The invention relates to a magnetic sharpening jig (1), in particular for holding, by means of magnetic force, a cutting tool (2) which is to be sharpened or polished and which has a magnetisable blade (2a), and for positioning said cutting tool relative to a sharpening and / or polishing tool, e.g. a roller sharpener (3). The aim of the invention is to provide a weight-reducing magnetic sharpening jig (1). According to the invention, this is achieved in that the magnetic sharpening jig (1) has a body (5) which consists of at least two assembled components (9, 10) and is hollow at least in some sections.

Description

[0001] Magnetic grinding gauge with multi-part, hollow body

[0002] The present invention relates to a magnetic grinding gauge, in particular for holding a cutting tool to be ground or polished with a magnetizable blade by means of magnetic force and for positioning the same relative to a grinding and / or polishing tool such as a roller grinder.

[0003] A generic magnetic grinding gauge according to the preamble of claim 1 is known from DE 10 2020 123 500 A1. A roller grinder is known, for example, from EP 3 278 928 A.

[0004] The magnetic grinding gauge known from the prior art has a body for gripping the magnetic grinding gauge, which is made of wood, plastic, or metal, for example. The body is solid and thus extremely stable, ensuring a secure hold on the magnetic grinding gauge even when high forces are applied to the blade during grinding or polishing. While such one-piece components have the advantage of being easy to manufacture, they require a high level of raw materials and thus incur high supply costs. Furthermore, the solid construction of the body required for stability is accompanied by a high weight. This increases the transport costs for the raw materials and delivery costs per manufactured product.

[0005] The present invention is therefore based on the object of providing a magnetic grinding gauge with low weight and high stability, which is resource-efficient and easy to manufacture.

[0006] To achieve this object, the present invention provides the magnetic grinding gauge according to claim 1. The magnetic grinding gauge according to the invention serves in particular for holding a cutting tool with a magnetizable blade to be ground or polished by means of magnetic force and for positioning the same relative to a grinding and / or polishing tool, such as a roller grinder. According to the invention, the magnetic grinding gauge has a body consisting of at least two assembled components and is hollow at least in sections.

[0007] The key advantage of the present invention over the prior art is that a hollow body can be manufactured from the assembled components with little effort. The multi-part design of the body allows a hollow space to be easily created in the center of the body by merging the components, without having to avoid undercuts during production. The weight of a body that is at least partially hollow is significantly lower than that of a magnetic grinding gauge body, which is made from a single piece and solid wood, plastic, or metal. The hollow body thus serves to save weight and increase resource efficiency, as fewer raw materials are required to manufacture the body.

[0008] It can be advantageous if at least two components are made of plastic. Plastic is a cost-effective material with excellent stability and processing properties.

[0009] It can prove useful if the at least two components are connected by a soft component, preferably a thermoplastic elastomer, preferably in an airtight and / or liquid-tight manner. This allows the components to be reliably connected to one another simply by injecting the soft component. Due to its fluidity, the soft component can flow into the areas between the components and connects the interfaces between the components, preventing air or water from entering the body. This makes the body robust against external influences and thus more durable. The soft component can also seal the components from one another.

[0010] It can be helpful if the components form a channel system for distributing the soft component inside the body. The soft component can then be guided precisely through the channel system inside the body, reliably connecting the components and stabilizing the body's internal structure without filling the cavities.

[0011] It can be beneficial if the body has at least one opening communicating with the channel system, from which the soft component protrudes, preferably a bottom-side opening, preferably to form at least one mounting section for the magnetic grinding gauge. This makes it possible for the body to be filled with soft component from only one opening. This saves work steps during body manufacture. If the opening also forms a mounting section for the magnetic grinding gauge at a bottom-side opening, the injection can be used synergistically as an additional manufacturing step for a mounting section. This further shortens the body manufacturing process.

[0012] It may be advantageous if at least two components are injection-molded components, preferably each with a different framework structure, particularly a star, honeycomb, rib, or lattice structure. Injection molding has the advantage that complex component structures can be produced quickly and directly. The different framework structures of the components, such as star, honeycomb, rib, or lattice, enable individual component design, achieving an optimum balance between lightweight construction and component stability.

[0013] It can be practical if one of the components forms a housing component with a receptacle into which the other component is inserted as an insert component. This supports intuitive assembly of the components and minimizes the number of joints on the outer contour of the body. The body is thus protected from dirt and liquids that could penetrate the body.

[0014] It can be helpful if the insert component partially or completely closes the receptacle, preferably in such a way that an outer side of the insert component is flush with an outer side of the housing that has the receptacle, with the outer sides lying in one plane, preferably a mounting plane of the body or a plane parallel thereto. The flushness of the outer sides of the components indicates the correct assembly of the components and ensures a flat underside of the body, which stands securely on a level surface.

[0015] It can be advantageous if the components have opposing wall structures when assembled. This creates a support and connecting surface for the injected soft component, thus ensuring a reliable connection of the components in the smallest possible space. The wall structures also prevent the components from slipping relative to each other before the soft component has been injected or cured.

[0016] It can be useful if the body has at least one contact side on which a contact element is arranged, with which the magnetically attracted blade of the cutting tool comes into contact as intended. The contact element partially covers the contact side or completely conceals it. This can prevent unintentional contact of the blade with the body of the magnetic grinding gauge. Furthermore, the contact element can be colored and used as a decorative element on the body of the magnetic grinding gauge.

[0017] It may prove useful if the magnetic grinding gauge has a plurality of contact elements, which are preferably arranged on different, preferably on opposite or opposite contact sides of the body of the magnetic grinding gauge, wherein the contact elements preferably enclose different acute angles with a mounting plane of the magnetic grinding gauge. The grinding angle, which is preferably measured between the surface of the contact element (or contact surface) and a plane oriented perpendicular to the substrate, is preferably in the range between 15° and 20°. The grinding surface of a roller grinder is generally aligned in a plane oriented perpendicular to the substrate. The angle between the contact surface of the contact element and the substrate is therefore preferably in the range between 70° and 75°.

[0018] It can be useful if the magnetic grinding gauge has a plurality of contact elements, which are preferably arranged on different, preferably opposite or opposite contact sides of a body of the magnetic grinding gauge, wherein the contact elements preferably enclose different acute angles with a mounting plane of the magnetic grinding gauge. The grinding angle, which is preferably measured between the surface of the contact element (or contact surface) and a plane oriented perpendicular to the substrate, is preferably in the range between 15° and 20°. The grinding surface of a roller grinder is generally aligned in a plane oriented perpendicular to the substrate. The angle between the contact surface of the contact element and the substrate is therefore preferably in the range between 70° and 75°.

[0019] A further aspect of the invention relates to a set comprising a magnetic grinding gauge according to one of the preceding embodiments and a roller grinder, preferably a roller grinder according to EP 3 278 928 A. Such a roller grinder can be moved in a rolling manner over a base and has at least one frontal grinding or polishing surface.

[0020] Yet another aspect of the invention relates to a method for producing the magnetic grinding gauge according to one of the preceding embodiments, comprising the steps:

[0021] Step A: Providing the components, preferably by injection molding or 3D printing.

[0022] Step B: Merging the components.

[0023] Step C: Injecting a soft component, preferably a thermoplastic elastomer, into a channel system between the components to tightly connect the components.

[0024] It can be advantageous if the soft component is injected through a mounting section of a component. If the injection is performed through the bottom opening, any remaining injection residue can be used as a mounting section for the magnetic grinding gauge. Thus, the injection can be used synergistically as an additional manufacturing step for a mounting section. This shortens the body's manufacturing process.

[0025] Further advantageous embodiments result from combinations of the features disclosed in the claims, the description and the drawings.

[0026] Short description of the characters

[0027] They show:

[0028] Fig. 1 : a schematic view of an arrangement comprising a magnetic grinding gauge, a cutting tool to be ground or polished and a grinding and / or polishing tool in the form of a roller grinder, wherein the blade of the cutting tool is held in contact with the magnetic grinding gauge so that the back of the blade is at a distance from the substrate and the cutting edge of the cutting tool is directed away from the substrate.

[0029] Fig. 2: the arrangement according to Fig. 1 from a different perspective.

[0030] Fig. 3: a perspective view of an assembled magnetic grinding gauge.

[0031] Fig. 4A: an exploded perspective view of the magnetic grinding gauge looking from above at a housing component and an insert component of a body of a first embodiment in a state before assembly to the body.

[0032] Fig. 4B: an exploded perspective view of the magnetic grinding gauge looking from below at the housing component and the insert component of the body of the first embodiment of Fig. 4A.

[0033] Fig. 5: a sectional view of the assembled body of the first embodiment.

[0034] Fig. 6: a perspective exploded view looking from below at the housing component and the insert component of the body of the first embodiment including an injection-molded soft component which represents a negative form of the channel system between the housing component and the insert component.

[0035] Fig. 7A: A perspective bottom view of a housing component of a body of a second embodiment. Fig. 7B: A perspective top view of an insert component of the body of the second embodiment.

[0036] Detailed description of the preferred embodiments

[0037] The magnetic grinding gauge 1 according to the invention serves to hold a cutting tool 2 to be ground or polished, having a magnetizable blade 2a, by means of magnetic force, and to position the same relative to a grinding and / or polishing tool, such as a roller grinder 3. According to the invention, the magnetic grinding gauge 1 comprises a body consisting of at least two assembled components and being hollow at least in sections. The magnetic grinding gauge 1 is claimed independently of the cutting tool 2 and its blade 2a. Therefore, the description and claims address the intended application of the magnetic grinding gauge 1, in which the blade 2a of the cutting tool 2 rests flat against the contact element 4, as clearly shown in Figs. 1 and 2.In the intended application, ideally only the magnetically attracted blade 2a of the cutting tool 2 comes into contact with the contact element 4 over its entire surface or over its entire surface, whereby any contact of the cutting tool 2 with a body 5 or magnet of the magnetic grinding gauge 1 is avoided.

[0038] The magnetic grinding gauge 1 is designed in particular for positioning cutting tools 2 in the form of kitchen knives. Kitchen knives often have a stainless steel blade 2a with an approximately flat blade surface and a slightly curved, one-sided cutting edge 2b. However, it is fundamentally possible that, in addition to kitchen knives, other cutting tools 2 can also be positioned with the magnetic grinding gauge 1 according to the invention. The shape of the cutting tool 2 and the blade 2a are therefore not critical.

[0039] Figures 1 and 2 show the general composition and use of the magnetic grinding gauge 1, the cutting tool 2 to be ground or polished, and the grinding and / or polishing tool 3. To grind or polish a cutting tool 2 with the magnetic grinding gauge 1, the magnetic grinding gauge 1 with body 5 and support sections 7 is placed on a flat base U. A cutting tool 2 provided with a magnetizable blade 2a and cutting edge 2b, such as a kitchen knife with a stainless steel blade, is arranged with its magnetizable blade 2a in the magnetic field of the magnetic grinding gauge 1 as intended, such that the blade 2a is aligned parallel to the contact surface of the contact element and only the magnetically attracted blade 2a comes into (full) contact with the contact element 4. The cutting edge 2b points away from the base U and the blade 2a is spaced from the base U.The blade 2a is therefore held in contact with the contact element 4 solely by the magnetic force of the magnetic grinding gauge 1.

[0040] The roller grinder 3 is movable in a rolling manner over a base U and has at least one front-side grinding or polishing surface. The roller grinder 3 with the front-side grinding or polishing surface is moved in a horizontal rolling manner over the flat base U and is held in contact with the cutting edge 2b of the blade 2a of the cutting tool 2 with the grinding or polishing surface aligned in a vertical plane. The direction of movement of the roller grinder 3 is approximately parallel to the direction of extension of the blade 2a. The grinding angle is defined by the plane of extension of the blade 2a, which is held in contact with the contact element 4 as intended, and the vertical plane of the grinding or polishing surface.

[0041] Fig. 3 shows a perspective view of one of the body 5. The body 5 is approximately cuboid-shaped. The body 5 has only flat sides. The edges 5a on the upper side of the body 5 are preferably more chamfered or rounded than the other edges of the body 5. The contact sides 8 of the body are arranged at an angle. The contact element 4 is attached to at least one of the contact sides 8 of the body 5. Magnets (not shown) are arranged beneath the contact element 4. On the underside of the body 5, in each of the corner regions, there are support sections 7 (not shown). Each support section 7 is made of plastic and comprises a head. The attachment of the support sections 7 will be discussed in more detail later.

[0042] The preferred embodiments of the magnetic grinding gauge 1 according to the invention are explained below with reference to the figures.

[0043] First embodiment (Figures 4A to 6)

[0044] The magnetic grinding gauge 1 according to the first embodiment of the invention is described below with reference to Figures 4 to 6.

[0045] 4A and 4B show a perspective top view and bottom view of two components 9, 10 of a body 5 of a first embodiment in a state before assembly to form the body 5. The component 9 shown at the top in Figures 4A, 4B and 5 is a housing component 9. The component 10 shown at the bottom in Figures 4A, 4B and 5 is an insert component 10. The insert component 10 is configured to be inserted into the housing component 9 such that the housing component 9 receives and encloses the insert component 10. The housing component 9 is cuboid-shaped, in particular with a trapezoidal cross-sectional shape, and has an open side (bottom side) in the form of a receptacle 9a.In the contact side 8 of the housing component 9, two, preferably cylindrical, recesses for magnets 6 are made, into which correspondingly shaped, cylindrical magnets are inserted with a precise fit in order to be flush with the contact side 8 of the body 5 and to be arranged below the contact element 4.

[0046] The insert component 10 is essentially plate-shaped and has an outer side 10a with an outer edge 10b. The housing component 9 receives the insert component 10 such that the insert component 10 partially or completely closes the receptacle 9a, so that an outer side 10a of the insert component 10 is flush with an outer side 9b of the housing component 9, wherein an outer side 9b of the housing component 9 and the outer side 10a of the insert component 10 lie in a plane, preferably a mounting plane E (see Fig. 5) of the body 5 or a plane parallel thereto. The housing division therefore lies in one plane, namely the plane of the underside of the body 5. The flushness of the outer sides 9b, 10a of the components 9, 10 indicates the correct assembly of the components 9, 10 and ensures a flat underside of the body 5, which stands stably on a flat surface.

[0047] The components 9, 10 are manufactured by injection molding or 3D printing, preferably from plastic. This allows complex component structures to be manufactured quickly and directly. The components 9, 10 have a framework structure 9c, 10c. The framework structure 9c of the housing component 9 is star-shaped. The framework structure 10c of the insert component 10 is honeycomb-shaped. The framework structure can also be designed as a rib or lattice structure or the like. The different framework structures 9c, 10c enable individual design of the components 9, 10 for an optimum balance between lightweight construction and stability of the components 9, 10. The less framework structure required, the higher the proportion of hollow space in the components 9, 10, which reduces the weight of the components 9, 10.

[0048] The components 9, 10 each have wall structures 9d, 10d which preferably run perpendicular to the installation plane E, or in the assembly direction, and spaced from the outer edge of the components 9, 10. The wall structures 9d, 10d are arranged such that they face each other when the components 9, 10 are assembled. The wall structure 10d of the insert component 10 runs, as shown in Fig. 5, between two adjacent wall structures 9d of the housing component 9. The wall structures 9d, 10d provide a support and connecting surface between the components and thus ensure a reliable connection of the components in the smallest possible space. The wall structures 9d, 10d also prevent the components 9, 10 from slipping relative to one another when assembled. It is conceivable that the wall structures 9d, 10d generate a common press fit, which in the assembled state generates a firm fit of the components 9, 10 to one another.In addition, the wall structures 9d, 10d may have ribs and grooves that interlock when assembled.

[0049] In the assembled state, the framework structures 9c, 10c and the wall structures 9d, 10d of the components 9, 10 form a channel system 12 inside the body 5. At the position where the outer edge 10b of the insert component 10 is flush with the outer side 9b of the housing component 9, the channel system 12 has an opening 12a. The opening 12a therefore runs rectangularly between the outer edge 10b of the insert component 10 and the outer side 9b of the housing component 9. Preferably, the opening 12a represents the only opening of the channel system 12. A connecting means in the form of a soft component 11, preferably a thermoplastic elastomer, is introduced or injected into the opening 12a to connect the components 9, 10. Through the course of the opening 12a and the channel system 12 arranged in the body 5, the injected soft component 11 is guided in a targeted manner in the body 5 to the wall structures 9d, 10d of the components 9, 10.In addition, the soft component 11 cannot enter the cavity in the body 5 through the closed channel system 12. After the soft component 11 has hardened, the components 9, 10 are connected in an airtight and / or liquid-tight manner.

[0050] It is possible for additional bottom-side openings 12b to be arranged in corner sections of the outer side 10a of the insert component 10. In an injection process into the openings 12b, support sections 7 of the magnetic grinding gauge 1 are formed. This makes it possible to eliminate the manufacturing step for the support sections 7 during the manufacture of the body 5. This shortens the manufacturing process for the body 5.

[0051] Fig. 6 shows a perspective exploded view of the housing component 9 and the insert component 10 of the body 5 of the first embodiment, including an injection-molded soft component 11, which represents a negative form of the channel system 12 between the housing component 9 and the insert component 10. The mounting sections 7 are connected to the framework of the soft component 11.

[0052] Fig. 5 shows a sectional view of the body 5 of the first embodiment in assembled form. One side (here the right) of the body 5, which faces a mounting plane E of the magnetic grinding gauge 1 and forms an acute angle (90°-a1) of, for example, 70° with it, forms a first contact side 8 of the magnetic grinding gauge 1. The grinding angle a1 formed on this side of the magnetic grinding gauge 1 is 20° and corresponds to the angle between the contact side 8 and a grinding plane S aligned perpendicular to the mounting plane E. The side of the body opposite the first contact side 8, which forms an acute angle (90°-a2) of, for example, 75° with the mounting plane E, forms a second contact side 8 of the magnetic grinding gauge 1. The grinding angle a2 formed on this side of the magnetic grinding gauge 1 is 15° and corresponds to the angle between the contact side 8 and a grinding plane S aligned perpendicular to the mounting plane E.Depending on the nature of the cutting tool 2 to be ground, the preferred side of the magnetic grinding gauge 1 can be selected. The body 5 can also have only one angled contact side 8, while a contact side 8 arranged on the opposite side runs perpendicular to the installation plane E.

[0053] The contact side 8 of the body 5 as well as the outward-facing end faces of the magnets inserted into the recess for magnets 6 are fully covered and glued with the contact element 4 (not shown) with a rectangular outline. On the side of the contact element 4 applied to the body 5, the contact element 4 forms a flat contact surface for the blade 2a of the cutting tool 2, against which the blade can ideally rest over its entire surface without the cutting tool 2 coming into contact with the body 5 of the magnetic grinding gauge 1. Optionally, a marking for indicating the amount ("20°" or "15°") of the respective grinding angle a1, cd is provided on the contact surface of the contact element 4, e.g., incorporated as a recess in the contact element 8. A marking in the form of an imprint is also possible.

[0054] Second embodiment (Figures 7A and 7B)

[0055] In the second embodiment, which is described below with reference to Figures 7A and 7B, the body 5 of the magnetic grinding gauge 1 comprises largely identical features to the first embodiment, the differences being explained below: In contrast to the first embodiment, the insert component 10 of the magnetic grinding gauge 1 of the second embodiment has a framework structure 10c in lattice form. A framework structure 10c in lattice form is easier to distribute completely over the entire surface of the insert component 10 than a honeycomb structure. In addition, the insert component 10 has four sleeve sections 10d as wall structures 10d. The sleeve sections 10d are hollow cylindrical sections that protrude upward from the insert component 10 perpendicular to the installation plane E.The housing component 9 of the second embodiment has pin sections 9d corresponding to the sleeve sections 10d, which are configured to penetrate into the sleeve sections 10d when the components 9, 10 are assembled. The pin sections 9d and the sleeve sections 10d serve as guide and plug-in means for connecting the components 9, 10 to one another. The plug-in connection can be shaped to generate a press fit. Furthermore, the pin sections 9d and / or the sleeve sections 10d can have an internal channel through which the soft component 11 can be injected to permanently connect the components to one another.

[0056] Although the invention has been described with reference to specific embodiments for the purpose of complete and clear disclosure, the appended claims are not to be so limited, but are to be interpreted to embody all modifications and alternative constructions that may reasonably occur to one skilled in the art that fall within the basic teachings presented herein. Additionally, the features of various implementation embodiments may be combined to form further embodiments of the invention.

[0057] List of reference symbols

[0058] 1 magnetic grinding gauge

[0059] 2 cutting tools (knives)

[0060] 2a blade

[0061] 2b Cutting edge

[0062] 3 roller grinders

[0063] 4 Contact element

[0064] 5 bodies

[0065] 5a edge

[0066] 6 Recess for magnet

[0067] 7 Installation section

[0068] 8 Investment page

[0069] 9 Component, housing component

[0070] 9a Recording

[0071] 9b Outside

[0072] 9c framework structure

[0073] 9d Wall structure, pin section

[0074] 10 Component, insert component

[0075] 10a Outside

[0076] 10b Outer edge

[0077] 10c framework structure

[0078] 10d wall structure, sleeve sections

[0079] 11 Soft component

[0080] 12 channel system

[0081] 12a Opening

[0082] 12b bottom opening a1, a2 angle

[0083] E Installation level

[0084] S frontal plane

[0085] Underground

Claims

Claims 1. Magnetic grinding gauge (1), in particular for holding a cutting tool (2) to be ground or polished, having a magnetizable blade (2a), by means of magnetic force and for positioning the same relative to a grinding and / or polishing tool such as a roller grinder (3), characterized in that the magnetic grinding gauge (I) has a body (5) which consists of at least two assembled components (9, 10) and is hollow at least in sections.

2. Magnetic grinding gauge (1) according to the preceding claim, characterized in that the at least two components (9, 10) are made of plastic.

3. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the at least two components (9, 10) are connected by a soft component (II), preferably a thermoplastic elastomer, are preferably connected in an airtight and / or liquid-tight manner.

4. Magnetic grinding gauge (1) according to the preceding claim, characterized in that the components (9, 10) form a channel system (12) for distributing the soft component (11) inside the body (5).

5. Magnetic grinding gauge (1) according to the preceding claim, characterized in that the body has at least one opening (12a) communicating with the channel system (12), from which the soft component (11) protrudes, preferably a bottom-side opening (12b), preferably in order to form at least one mounting section (7) of the magnetic grinding gauge (1).

6. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the at least two components (9, 10) are injection-molded components and preferably each have a different framework structure (9c, 10c), in particular in a star, honeycomb, rib or lattice structure.

7. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that one of the components (9) forms a housing component (9) with a receptacle (9a) in which the other component (10) is inserted as an insert component (10).

8. Magnetic grinding gauge (1) according to the preceding claim, characterized in that the insert component (10) partially or completely closes the receptacle (9a), preferably in such a way that an outer side (10a) of the insert component (10) is flush with an outer side (9b) of the housing component (9) having the receptacle (9a), wherein the outer side (9b) of the housing component (9) and the outer side (10a) of the insert component (10) lie in one plane, preferably a mounting plane (E) of the body (5) or a plane parallel thereto.

9. Magnetic grinding gauge (1) according to the preceding claim, characterized in that the components (9, 10) have opposing wall structures (9b, 10b) in the assembled state.

10. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the body (5) has at least one contact side (8) on which a contact element (4) with which the magnetically attracted blade (2a) of the cutting tool (2) comes into contact as intended is arranged, wherein the contact element (4) covers the contact side (8) in sections or covers it completely.

11. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the magnetic grinding gauge (1) has a plurality of contact elements (4) which are preferably arranged on different, preferably on mutually remote or opposite contact sides (8) of the body (5) of the magnetic grinding gauge (1), wherein the contact elements (4) preferably enclose different acute angles (a1, a2) with a mounting plane (E) of the magnetic grinding gauge (1).

12. Set comprising a magnetic grinding gauge (1) according to one of the preceding claims and a roller grinder (3), preferably a roller grinder according to EP 3 278 928 A.

13. A method for producing the magnetic grinding gauge (1) according to one of the preceding claims, comprising the steps: a. Providing the components (9, 10), preferably by injection molding or 3D printing. b. Assembling the components (9, 10). c. Injecting a soft component (11), preferably a thermoplastic elastomer, into a channel system (12) between the components (9, 10) in order to tightly connect the components (9, 10).

14. Method for producing the magnetic grinding gauge (1) according to the preceding claim, characterized in that the injection of the soft component (11) is carried out via a mounting section (7) of a component (10).

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