Sharpening jig having an adjustable angle

Abstract

The present invention relates to a sharpening jig (1), in particular for holding a cutting tool that is to be sharpened or polished and comprises a blade, and for positioning the blade at least at one positioning angle (α) relative to a sharpening and / or polishing tool such as a roller sharpener, wherein the sharpening jig (1) has at least two parts (2, 3) which can be adjusted relative to one another in order to set different positioning angles (α). In order to improve the compactness of the sharpening jig, the two parts (2, 3) can be adjusted relative to one another along a curved path.

Description

[0001] Grinding gauge with adjustable angle

[0002] The present invention relates to a grinding jig, in particular for holding a cutting tool to be ground or polished, having a blade, and for positioning the blade at at least one positioning angle relative to a grinding and / or polishing tool such as a roller grinder.

[0003] A generic grinding gauge according to the preamble of claim 1 is known from DE 102020 123 503 A1. A roller grinder is known, for example, from EP 3 278 928 A.

[0004] Such a grinding gauge fixes the blade, which is usually made of metal and therefore magnetizable, using magnetic force and is also referred to as a magnetic grinding gauge. However, the principle of the present invention is fundamentally applicable to all types of grinding gauges, as long as the blade of the cutting tool to be ground or polished can be positioned at a predetermined angle relative to the grinding and / or polishing tool.

[0005] The grinding gauge known from DE 10 2020 123 503 A1 comprises at least two parts that are adjustable relative to each other to set different positioning angles. The relatively adjustable parts of this grinding gauge are adjustable at right angles to each other, which causes the parts to protrude in directions perpendicular to each other, preventing the grinding gauge from being compact.

[0006] In order to reduce the space required for the grinding gauge and to facilitate handling of the grinding gauge, it is therefore the object of the present invention to provide a compact grinding gauge.

[0007] To achieve this object, the present invention provides the grinding jig according to claim 1. The grinding jig according to the invention serves in particular for holding a cutting tool to be ground or polished, having a blade, and for positioning the blade at at least one positioning angle relative to a grinding and / or polishing tool, such as a roller grinder, wherein the grinding jig has at least two parts that are adjustable relative to one another. According to the invention, the two parts are adjustable relative to one another along a curved path. The two parts can have complementary shapes along the curved path, such that one part surrounds or even encloses the other part, at least in section. Ultimately, the adjustability of the two parts along a curved path promotes the compactness of the grinding jig.It can be advantageous if the curved path lies in a plane oriented perpendicular to the mounting plane of the grinding gauge. This configures the grinding gauge as a kind of rocker. This also promotes the compactness of the grinding gauge in the plane oriented perpendicular to the mounting plane. In other words, the height of the grinding gauge can be kept low.

[0008] It can be useful if the curved path is a circular section. This allows different positioning angles to be realized at regular intervals.

[0009] It can be helpful if the relative adjustable parts can be adjusted stepwise between different positions. This increases the user-friendliness of the grinding gauge.

[0010] It can be useful if the relatively adjustable parts can be locked in different, preferably three, positions, particularly with a force-locking and / or positive locking mechanism, preferably with a latching mechanism. This ensures that the set positioning angle remains unchanged even when high forces are applied to the grinding gauge, e.g., during grinding or polishing of the blade. Furthermore, this ensures reproducibility of the grinding or polishing result.

[0011] It can prove practical if the grinding gauge has a guide to adjust the relatively adjustable parts between different positions in a guided movement. This can further improve the user-friendliness of the grinding gauge according to the invention. Incorrect operation of the grinding gauge is thus eliminated or at least made more difficult.

[0012] It can be useful if the guide is firmly connected to one of the relatively adjustable parts and has at least one guide slot, and the other of the relatively adjustable parts comprises a guide element, preferably a guide pin, that engages the guide slot, preferably forming a transition fit. This allows the relatively adjustable parts to be connected to one another in such a way that they only have the degree of freedom of movement permitted by the guide. The relative movement between the relatively adjustable parts is thus clearly defined.

[0013] It may be advantageous if the relatively adjustable parts are resiliently preloaded against each other, preferably in a locked state, wherein the locked state can preferably be released by reducing or removing the resilient preload, so that the parts are adjustable relative to each other. This reduces the risk of the relatively adjustable parts being inadvertently adjusted and the positioning angle being changed.

[0014] It may be useful for the grinding gauge to have at least one spring pressure piece for generating the resilient preload between the relatively adjustable parts. The spring pressure piece is preferably connected to one of the relatively adjustable parts and engages a locking recess in the other of the relatively adjustable parts to create a locked state. The spring pressure piece can provide a simple and robust component for generating the resilient preload between the relatively adjustable parts.

[0015] It may be useful if at least one of the relatively adjustable parts has an actuating portion that a user can actuate, preferably manually, in particular by exerting pressure or tension, to adjust the parts relative to one another. Providing an actuating portion promotes intuitive operation of the grinding gauge by a user. Furthermore, the actuating portion makes it easier to adjust the parts relative to one another.

[0016] It may prove useful if one of the parts that can be adjusted relative to one another is accommodated in an opening in the other part, wherein the two parts can preferably assume a position in which one part completely closes the opening of the other part and / or can assume a position in which one part protrudes at least partially from the opening of the other part. Such a configuration also includes the other of the parts that can be adjusted relative to one another forming a housing, the opening of which is located in one side of the housing, preferably in a flat underside of the housing, wherein the one part is in a position flush with the side of the housing having the opening or lies in a plane with it. As a result, the compactness of the grinding gauge is improved.

[0017] It can be useful if the grinding gauge has at least one first base attached to one of the relatively adjustable parts, and at least one second base attached to the other of the relatively adjustable parts. This prevents static overdetermination and, consequently, wobbling of the grinding gauge. It can prove advantageous if the grinding gauge has a scale for reading the degree of the set positioning angle. This makes it easy for the user to see which positioning angle is currently set. This improves the user-friendliness of the grinding gauge.

[0018] It may prove practical if several degrees corresponding to the adjustable positioning angles are affixed, preferably printed, to one of the relatively adjustable parts, and the other of the relatively adjustable parts includes at least one opening through which the corresponding degree of the set positioning angle can be read. This allows the scale to be easily integrated into the relatively adjustable parts without the need for additional components.

[0019] It may be useful if at least one of the relatively adjustable parts is designed as a body having at least one contact surface, preferably two contact surfaces, against which the blade can be held in contact as intended. The two contact surfaces preferably form different angles with a mounting plane of the grinding gauge in each position of the two relatively adjustable parts. This allows for an increase in the number of different positioning angles and the expanded functionality of the grinding gauge.

[0020] Terms and definitions

[0021] The positioning angle in the context of the present invention refers to the angle at which the blade, in particular the blade plate, of the grinding tool to be ground or polished is held relative to a plane oriented perpendicular to the base (installation plane), in particular the grinding plane, during the intended use of the grinding jig according to the invention. During the intended use, the grinding jig is positioned in the intended arrangement on a preferably flat, preferably horizontal base (installation plane), particularly preferably on the same base on which the roller grinder is moved. In addition, the (usually magnetic) blade plate is held (preferably magnetically) in contact with a contact surface of the grinding jig, so that the blade plate is aligned parallel to this contact surface. Thus, the positioning angle generally corresponds to the grinding angle.

[0022] Short description of the drawings

[0023] They show:

[0024] Fig. 1: a perspective view of the top side of the grinding gauge 1. Fig. 2: a perspective view of the bottom side of the grinding gauge 1, wherein the parts which are adjustable relative to one another, ie the slider 3 in relation to the base body 2, are in a first position which corresponds to a basic position of the grinding gauge 1.

[0025] Fig. 3: a perspective view of the underside of the grinding gauge 1, wherein the parts adjustable relative to one another, ie the slide s in relation to the base body 2, are in a second position which corresponds to a central position of the grinding gauge 1.

[0026] Fig. 4: a perspective view of the underside of the grinding gauge 1, wherein the parts adjustable relative to one another, ie the slider s in relation to the base body 2, are in a second position which corresponds to a maximum position of the grinding gauge 1.

[0027] Fig. 5: an exploded view of the relatively adjustable parts, ie the base body 2 and the slide 3.

[0028] Fig. 6: an exploded view of the slider 3 and the guide 4 in a first perspective.

[0029] Fig. 7: an exploded view of the slider 3 and the guide 4 in a second perspective.

[0030] Fig. 8: an exploded view of the grinding gauge 1 in a first perspective.

[0031] Fig. 9: an exploded view of the grinding gauge 1 in a second perspective.

[0032] Fig. 10: a side sectional view of the grinding gauge 1 in the basic position.

[0033] Fig. 11 a side sectional view of the grinding gauge 1 in the maximum position.

[0034] Detailed description of the preferred embodiments

[0035] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying figures.

[0036] As shown in Fig. 1, the grinding gauge 1 comprises an approximately cuboid-shaped base body 2 with two opposing contact sides inclined toward a mounting plane AE of the grinding gauge 1, to each of which an elastic contact element 8 is attached. The base body 2 therefore has a trapezoidal cross-section in a cross-sectional plane intersecting the contact element 8 perpendicularly. The base body 2 can be made, in particular, of wood and / or metal and / or plastic. The base body 2 is preferably a die-cast part.

[0037] Each of the elastic contact elements 8 is intended as a contact surface for the blade of a cutting tool. When the grinding gauge 1 is used as intended, the blade is attracted by one or more magnets 9 (not shown in Fig. 1, see Figs. 8 and 9 instead) located behind the respective contact element 8, and rests flat against the contact element. The contact element is an elastomer with high adhesive strength.

[0038] The base body 2, as shown in Figs. 2 to 4, has an opening 2a in which a slider 3 is accommodated. The slider 3 can be adjusted relative to the base body 2 along a curved path by exerting pressure or tension on the slider 3. For this purpose, the slider 3 has an actuating section 3a in the form of ribs on its underside. A user can manually exert pressure or tension on the actuating section 3a, in particular with the thumb, and thus adjust the slider 3 relative to the base body 2.

[0039] The slider 3 is adjustable in steps relative to the base body 2 so that it can assume several defined positions. Fig. 2 shows a first position of the slider 3, in which the slider 3 completely closes the opening 2a of the base body 2. This means that in the first position the underside of the slider 3 is flush with the underside of the base body 2. This first position of the slider 3 in relation to the base body 2 corresponds to a basic position of the grinding gauge 1. Fig. 3 shows a second position of the slider 3 relative to the base body 2, in which one end of the slider 3 protrudes from the opening 2a of the base body 2, i.e. over the underside of the base body 2, and the opposite end of the slider 3 protrudes into the opening 2a of the base body 2a. This second position of the slider 3 in relation to the base body 2 corresponds to a middle position of the grinding gauge 1. Fig.3 finally shows a third position of the slider 3 relative to the base body 2, in which one end of the slider 3 protrudes further than in Fig. 2 from the opening 2a of the base body 2 and the opposite end of the slider 3 protrudes further than in Fig. 2 into the opening 2a of the base body 2a. This third position of the slider 3 relative to the base body 2 corresponds to a maximum position of the grinding gauge 1. The slider 3 can be made of wood and / or metal and / or plastic. In particular, the slider 3 can be made of the same material as the base body 2 or of a different material. The slider 3 is preferably a die-cast part. If the grinding gauge 1 is positioned with its underside on the installation plane AE, which is preferably designed as a horizontal base, the base body 2 can be oriented in a total of three positions relative to the installation plane AE according to the configuration described above. Fig.Fig. 10 shows a side sectional view of the grinding gauge 1 in the basic position, i.e. in the first position of the slider 3 relative to the base body 2. Fig. 11 shows a side sectional view of the grinding gauge 1 in the maximum position, i.e. in the third position of the slider 3 relative to the base body 2. Due to the fact that the two opposite contact sides of the base body 2, to each of which an elastic contact element 8 is attached, enclose different angles with the plane of the underside of the base body 2, a total of six different positioning angles (grinding angles) a can be provided with the described grinding gauge 1. In the described embodiment, the possible positioning angles a are 10°, 13°, 15°, 20°, 22° and 25°.The grinding gauge 1 is configured in such a way that the positioning angles a of 15° and 20° are formed on the opposite contact sides of the base body 2 in the basic position, the positioning angles a of 13° and 22° in the middle position and the positioning angles a of 10° and 25° in the maximum position.

[0040] To position the grinding gauge 1 on the installation plane AE, support feet 7 are attached to the underside of the grinding gauge 1. The support feet 7 are designed as elongated elastic elements, with one support foot 7 attached to one end of the underside of the base body 2 and another support foot 7 attached to an opposite end of the underside of the slider 3. The support feet 7 are glued to the base body 2 and the slider 3, respectively. Due to their elasticity, the support feet 7 prevent the grinding gauge 1 from slipping during the grinding or polishing process.

[0041] The internal structure of the grinding gauge 1 and the functional principle of the adjustability of the slider 3 relative to the base body 2 are described below with reference to Figs. 5 to 9.

[0042] The slider 3 is connected to the base body 2 via a guide 4. The guide 4 is an elongated element made of plastic. The guide 4 can, in particular, be an injection-molded part. The guide 4 is fastened in the opening 2a of the base body 2 using fastening means 10, for example a screw, in a form-fitting and / or force-fitting manner. With the help of the screw, the guide 4 can, for example, be pressed against contact surfaces provided in the opening 2a. For this purpose, the screw is screwed into the base body 2 and presses diagonally against one side of the guide 4. The screw can be secured in the base body 2 using adhesive. The guide 4 comprises two separate guide slots 4a, each designed as an elongated hole extending along a curved path, in particular a circular path section. The two guide slots 4a are arranged one behind the other on the curved path.The slide 3a comprises a base plate, one side of which forms the underside of the slide 3, and two walls 3b arranged vertically and opposite one another on the other side of the base plate. The walls 3b are spaced apart so that they can accommodate the guide 4 between them. Furthermore, the walls 3b each have two through-holes. When the slide 3 is assembled in the base body 2, guide elements 5, in particular guide pins, are inserted into the through-holes of the walls 3b, with each guide element 5 also protruding through a corresponding guide slot 4a of the guide 4 located between the walls 3b. The slide 3 can therefore be adjusted in a guided movement along the guide 4, since the guide elements 5 connected to the slide 3 are guided by the guide slots 4a of the guide 4.For this purpose, a transition fit is preferably formed between each guide element 5 and the corresponding guide slot 4a.

[0043] The guide 4 has three locking recesses 4b with a curved profile in a surface running parallel to the guide slots 4a and facing the base plate of the slide 3. On the other side, two adjacent spring pressure pieces 6 are accommodated in the base plate of the slide 3, the ball heads of which protrude beyond the base plate of the slide 3. The ball heads of the spring pressure pieces 6 are preloaded against the guide 4 and engage in the corresponding locking recess 4b in the first, second, and third positions of the slide 3 relative to the base body 2, thereby locking the set position of the slide 3 relative to the base body 2.When pressure or tension exceeding a certain limit is exerted on the slide 3 in a direction in which adjustment is possible, the locking is released because the ball heads of the spring pressure pieces 6 slide along the curved profile of the locking recess 4b and are pushed back against the preload until they finally leave one locking recess 4b and engage in another locking recess 4b.

[0044] In the basic position and in the maximum position of the grinding gauge 1, adjustment is only possible in one direction. In these two positions, the guide slots 4a serve as end stops for the guide elements 5. This means that in these two positions, adjustment of the slide 3 relative to the base body 2 in one direction at a time is prevented (see Figs. 10 and 11). The grinding gauge 1 has a scale 11 for reading the degree of the set positioning angle a. For this purpose, several degrees corresponding to the adjustable positioning angles a are printed or engraved on the surface of the guide 4, in which the locking recesses 4b are also located. In the concrete embodiment, on this surface, three degrees (10°, 13°, 15°) are provided on one side of the locking recesses 4b and three degrees (20°, 22°, 25°) are provided on the other side of the locking recesses 4b.The slider 3 has two openings 3c in its base plate, which are provided at a distance from each other, so that one of the openings 3c is located near one contact side of the base body 2 and the other of the openings 3c is located near the other contact side of the base body 2. The positioning angle a set on the respective contact side of the base body 2 by the position of the slider 3 with respect to the base body 2 is displayed in the opening 3c, which is located near the respective contact side.

[0045] 8 and 9 that the elastic contact element 8 is attached to the respective contact side of the base body 2 via a carrier 12. For this purpose, the elastic contact element 8 is fastened on one side of the carrier 12 and the other side of the carrier 12 is connected to the base body 2. For this purpose, the carrier 12 comprises two connecting sections which are designed as cylindrical sleeves and are pressed into recess openings 2b in the contact side of the base body 2. To increase the connection strength, the connecting sections can have teeth on the outer circumference. An inner contour of the connecting sections serves as a magnet receptacle. This means that one or more magnets 9 can be accommodated in the carrier 12, which magnets generate the magnetic force required to attract the blade to the contact surface. Due to this configuration, the magnets 9 are positioned in the receiving openings 2b of the base body 2 when the carrier 12 is mounted.

[0046] In the described embodiment, the grinding gauge 1 can assume three defined positions (basic position, middle position, maximum position), whereby a total of six different positioning angles can be realized due to the differently inclined contact sides of the base body 2 with respect to the underside of the base body 2. It goes without saying that the invention is not limited to three defined positions of the grinding gauge 1, and the grinding gauge 1 can also be configured such that it can assume only two or more than three defined positions. List of reference symbols

[0047] 1 grinding gauge

[0048] 2 basic bodies

[0049] 2a Opening

[0050] 2b Carrier holder

[0051] 3 sliders

[0052] 3a Operating section

[0053] 3b Wall

[0054] 3c Opening

[0055] 4 Leadership

[0056] 4a Guide backdrop

[0057] 4b Locking recess

[0058] 5 Guide element (guide bolt)

[0059] 6 spring pressure piece

[0060] 7 Stand

[0061] 8 Elastic contact element

[0062] 9 Magnet

[0063] 10 fasteners (screw)

[0064] 11 scale

[0065] 12 carriers

[0066] AE Installation level of the grinding gauge

Claims

Claims 1. Grinding gauge (1), in particular for holding a cutting tool to be ground or polished, having a blade, and for positioning the blade at at least one positioning angle (α) relative to a grinding and / or polishing tool such as a roller grinder, wherein the grinding gauge (1) has at least two parts (2, 3) which are adjustable relative to one another in order to set different positioning angles (α), characterized in that the two parts (2, 3) are adjustable relative to one another along a curved path.

2. Grinding gauge (1) according to the preceding claim, characterized in that the curved path lies in a plane oriented perpendicular to the installation plane (AE) of the grinding gauge (1).

3. Grinding gauge (1) according to one of the preceding claims, characterized in that the curved path is a circular path section.

4. Grinding gauge (1) according to one of the preceding claims, characterized in that the parts (2, 3) which are adjustable relative to one another can be adjusted stepwise between different positions.

5. Grinding gauge (1) according to one of the preceding claims, characterized in that the parts (2, 3) which are adjustable relative to one another can be locked in different, preferably three, positions, in particular in a force-fitting and / or form-fitting manner, preferably in a latching manner.

6. Grinding gauge (1) according to one of the preceding claims, characterized in that the grinding gauge (1) has a guide (4) in order to adjust the relatively adjustable parts (2, 3) in a guided movement between different positions.

7. Grinding gauge (1) according to the preceding claim, characterized in that the guide (4) is firmly connected to one of the relatively adjustable parts (2, 3) and has at least one guide slot (4a), and the other of the relatively adjustable parts (2, 3) comprises a guide element (5), preferably a guide pin, which engages in the guide slot (4a), preferably forming a transition fit.

8. Grinding gauge (1) according to one of the preceding claims, characterized in that the parts (2, 3) which are adjustable relative to one another are resiliently prestressed against one another, preferably in a mutually locked state, wherein the locked state can preferably be released by reducing or removing the resilient prestress, so that the parts (2, 3) are adjustable relative to one another.

9. Grinding gauge (1) according to the preceding claim, characterized in that the grinding gauge (1) has at least one spring pressure piece (6) for generating the resilient preload between the relatively adjustable parts (2, 3), wherein the spring pressure piece (6) is preferably connected to one of the relatively adjustable parts (2, 3) and engages in a locking recess (4b) in the other of the relatively adjustable parts (2, 3) in order to generate a locked state.

10. Grinding gauge (1) according to one of the preceding claims, characterized in that at least one of the parts (2, 3) which can be adjusted relative to one another has an actuating section (3a) which a user can actuate, preferably manually, in particular by exerting pressure or tension, in order to adjust the parts (2, 3) relative to one another.

11. Grinding gauge (1) according to one of the preceding claims, characterized in that one of the parts (2, 3) which are adjustable relative to one another is received in an opening (2a) of the other part, wherein the two parts (2, 3) can preferably assume a position in which one part (3) completely closes the opening (2a) of the other part (2), and / or can assume a position in which one part (3) protrudes at least partially from the opening (2a) of the other part (2).

12. Grinding gauge (1) according to one of the preceding claims, characterized in that the grinding gauge (1) has at least one first base (7) which is attached to one of the relatively adjustable parts (2, 3), and at least one second base (7) which is attached to the other of the relatively adjustable parts (2, 3).

13. Grinding gauge (1) according to one of the preceding claims, characterized in that the grinding gauge (1) has a scale (11) for reading the number of degrees of the set positioning angle (a).

14. Grinding gauge (1) according to the preceding claim, characterized in that a plurality of degrees corresponding to the adjustable positioning angles (a) are applied, preferably printed, to one of the relatively adjustable parts (2, 3), and the other of the relatively adjustable parts (2, 3) comprises at least one opening (3c) through which the corresponding degree of the set positioning angle (a) can be read.

15. Grinding gauge (1) according to one of the preceding claims, characterized in that at least one of the parts (2, 3) which are adjustable relative to one another is designed as a body (2) which has at least one contact surface, preferably two contact surfaces, on which the blade (2a) can be held in contact as intended, wherein the two contact surfaces preferably enclose different angles with a mounting plane (AE) of the grinding gauge (1) in each position of the two parts (2, 3) which can be adjusted relative to one another.

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