Magnetic sharpening jig comprising a carrier for an elastic contact element

Abstract

The present invention relates to a magnetic sharpening jig (1), in particular for holding, by means of magnetic force, a cutting tool that is to be sharpened or polished and has a magnetisable blade, and for positioning said cutting tool relative to a sharpening and / or polishing tool such as a roller sharpener, the magnetic sharpening jig comprising a body (2) and at least one elastic contact element (3) with which the magnetically attracted blade of the cutting tool comes into contact as intended. In order to reduce the production complexity of the magnetic sharpening jig and to improve the quality of the magnetic sharpening jig, according to the invention the magnetic sharpening jig (1) comprises at least one carrier (4) which carries the elastic contact element (3) and which is connected to the body (2).

Description

[0001] Magnetic grinding gauge with carrier for an elastic contact element

[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 102020 123 500 A1. A roller grinder is known, for example, from EP 3278928 A.

[0004] The prior art magnetic grinding gauge comprises an elastic contact element with which the magnetically attracted blade of the cutting tool comes into contact as intended. The elastic contact element increases the static friction of the blade on the magnetic grinding gauge, allowing the blade to be securely positioned on the magnetic grinding gauge and, in particular, preventing the blade from slipping or detaching from the magnetic grinding gauge during the grinding process. In the known magnetic grinding gauge, the elastic contact element is glued to a contact side of a body of the magnetic grinding gauge.

[0005] Bonding the elastic contact element to the body of the magnetic grinding gauge requires considerable effort during production, as both the use of adhesive and the application of the elastic contact element to the body of the magnetic grinding gauge with the adhesive require great care and a correspondingly considerable amount of time. Furthermore, the bond strength of the adhesive may deteriorate over time due to environmental influences such as moisture or dirt.

[0006] The present invention is therefore based on the object of providing a magnetic grinding gauge which avoids the above-mentioned disadvantages by reducing the manufacturing effort of the magnetic grinding gauge, in particular the assembly effort of the elastic contact element on the body of the magnetic grinding gauge, and furthermore enables a durable and reliable connection of the elastic contact element to the body of the magnetic grinding gauge and thus an improved quality of the magnetic grinding gauge.

[0007] 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 to be ground or polished, having 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. The magnetic grinding gauge comprises a body and at least one elastic contact element with which the magnetically attracted blade of the cutting tool comes into contact as intended. According to the invention, the magnetic grinding gauge also comprises at least one carrier that carries the elastic contact element and is connected to the body.

[0008] The main advantage of the invention is that the elastic contact element does not have to be attached directly to the body of the magnetic grinding gauge; instead, this task is performed by the carrier, which acts as an intermediate piece. The carrier is designed so that it can be easily connected to both the elastic contact element and the body. This significantly simplifies the handling of the individual components during assembly of the magnetic grinding gauge, resulting in reduced overall manufacturing costs and, consequently, more economical and reliable production.

[0009] It can be advantageous if the elastic contact element has a higher elasticity than the carrier and / or the body. This allows the various functions of the individual components to be implemented optimally. While the elastic contact element with the higher elasticity can exert a high adhesive force on the blade through increased static friction, the carrier, as a stiffer structural element, serves as a solid and robust base for the elastic contact element and also enables a secure and permanent connection to the body. Because the carrier forms a stiff and solid base for the contact element, there are no unevenness on the contact element, which could possibly arise from the structure of the body.

[0010] It can be useful if the elastic contact element is injection-molded onto the carrier, in particular onto a carrier plate of the carrier, with the elastic contact element preferably encompassing an edge of the carrier or the carrier plate at least in sections. This allows the elastic contact element to be easily and securely connected to the carrier. The carrier can be manufactured together with the elastic contact element as a two-component injection-molded part.

[0011] It can prove practical if the carrier is connected to the body in a force-fitting and / or form-fitting manner, in particular without adhesive. This allows the carrier to be easily attached to the body, in particular eliminating the need for the use of adhesive. It can be useful if the carrier has at least one connecting section for connecting to the body, wherein the connecting section is preferably inserted, particularly preferably pressed, into a receiving opening in the body. With a connecting section that is inserted or pressed into a receiving opening in the body, a form-fitting and / or force-fitting connection between the carrier and the body can be easily achieved.

[0012] It may be advantageous if the connecting section is cylindrical, in particular if it is formed as a cylindrical sleeve onto a carrier plate of the carrier, wherein the connecting section preferably has a toothing on its outer circumference that engages the body or at least is in contact with it. A carrier plate with a molded-on cylindrical sleeve can be manufactured easily and cost-effectively, in particular by injection molding. With the help of the external toothing on the connecting section, the strength of the connection between the carrier and the body can be further improved, since the teeth engage the body or at least achieve increased pressure.

[0013] It may be useful for the carrier to include at least one magnet receptacle that preferably accommodates a magnet for generating the magnetic force in a form-fitting and / or force-fitting manner. The magnet receptacle is particularly preferably formed by an inner contour of the connecting section. Using the magnet receptacle, a magnet that generates the magnetic force for attracting the blade can be integrated into the carrier, which facilitates assembly, as the magnet can be attached together with the carrier to / in the body of the magnetic grinding gauge.

[0014] It can be useful if the magnet held in the magnet holder is positioned in a receiving opening in the body. The receiving opening in the body creates space for the magnet, allowing for a compact design of the magnetic grinding gauge.

[0015] It can prove helpful if the carrier is made of plastic, preferably polypropylene, and the body is particularly preferably made of wood and / or metal. A carrier made of plastic can be easily manufactured using injection molding. Using polypropylene as the material for the carrier provides a comparatively hard plastic material which is particularly suitable for connection to a body made of a softer material, e.g. wood, since the harder material can be pressed into the softer material. It can be advantageous if the elastic contact element comprises a sealing lip which rests on the body, wherein the sealing lip is preferably designed all the way around. This prevents a visible gap between the elastic contact element and the body, which in particular improves the design of the magnetic grinding gauge.In addition, the sealing lip also prevents an almost invisible air gap between the elastic contact element and the body, which prevents the accumulation of dirt and the associated formation of a dirt gap between the elastic contact element and the body.

[0016] It can prove useful if the body has at least one contact side on which the carrier is arranged together with the elastic contact element, with the elastic contact element partially or completely covering the contact side. This can prevent accidental 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 can be helpful if the body has a bottom side equipped with feet and a top side opposite the bottom side, which has a circumferential bevel. The feet allow the magnetic grinding gauge to be positioned securely and levelly on a surface. A circumferential bevel on the top side of the body promotes a free-standing blade edge, thus preventing damage to the elastic contact element during the grinding process.

[0018] Short description of the characters

[0019] They show:

[0020] Fig. 1 : a perspective view of the magnetic grinding gauge 1 according to the invention.

[0021] Fig. 2: a further perspective view of the magnetic grinding gauge 1 according to the invention.

[0022] Fig. 3: an exploded view of the magnetic grinding gauge 1 according to the invention.

[0023] Fig. 4: a partial exploded view of the magnetic grinding gauge 1 according to the invention.

[0024] Fig. 5: the partially exploded view of Fig. 4 from another perspective.

[0025] Fig. 6: a sectional view of the carrier 4 and the elastic contact element 3. Fig. 7: a sectional view of the carrier 4 mounted in a receiving opening 2a of the body 2.

[0026] Detailed description of the preferred embodiments

[0027] Fig. 1 and Fig. 2 show different perspective views of the magnetic grinding gauge 1 according to the invention.

[0028] The magnetic grinding gauge 1 comprises an approximately cuboid-shaped body 2 with two opposite sides inclined toward a mounting plane of the magnetic grinding gauge 1, each of which has an elastic contact element 3 attached. The body 2 therefore has a trapezoidal cross-section in a cross-sectional plane perpendicular to the contact element 3. The body 2 can be made, in particular, of wood and / or metal and / or plastic.

[0029] Each of the elastic contact elements 3 is intended as a contact surface for the blade of a cutting tool. When the magnetic grinding gauge 1 is used as intended, the blade is attracted by one or more magnets 5 (not shown in Figs. 1 and 2) located behind the respective contact element 3, and rests flat against the contact element 3. The contact element 3 is an elastomer with high adhesion strength.

[0030] The sides of the body 2 that face the mounting plane of the magnetic grinding gauge 1 and each form an acute angle (90°-a1 or 90°-a2) with it form the contact sides of the magnetic grinding gauge 1. In the present embodiment, the contact sides form different angles of, for example, 70° and 75° with the mounting plane. Accordingly, the grinding angles a1 and a2 formed on these sides of the magnetic grinding gauge 1 are 20° and 15°, respectively. A The grinding angle a1 or a2 is therefore the angle between the corresponding contact side and a vertical grinding plane oriented perpendicular to the installation plane, in which the grinding or polishing surface of a roller grinder is located and moves. The grinding angle formed on a contact side can be represented as a marking on the corresponding contact element 3.

[0031] In this exemplary embodiment, the magnetic grinding gauge 1 comprises two opposing contact sides, each provided with a contact element 3, which enclose different angles with the installation plane. In addition, however, it is also possible for the magnetic grinding gauge to comprise only one contact side with a specific angle or more than two, in particular four, contact sides, which all have different angles. An underside of the body 2 is provided with four elastic feet 6, with each foot 6 being attached approximately in a corner of the underside of the body 2. The feet 6 are plastic, in particular rubber, plugs which have a circumferential sawtooth profile on the outer circumference and are inserted into corresponding receiving openings in the underside of the body 2.The elastic feet 6 enable the magnetic grinding gauge 1 to be positioned flat on the support surface and prevent it from slipping during the grinding process. An upper side of the magnetic grinding gauge 1, opposite the underside, has a circumferential bevel, which keeps the cutting edge of a blade applied to the contact element 3 at a distance from the body 2 and prevents damage to the body 2 and / or the contact element 3 during the grinding process.

[0032] The support 4, which carries the contact element 3 and is connected to the body 2, is not shown in Figs. 1 and 2 since it is concealed by the contact element 3, but will be described below with reference to Figs. 3 to 7.

[0033] Fig. 3 shows an exploded view of the magnetic grinding gauge 1, in which all components of the magnetic grinding gauge 1 are shown in an exploded view. Figs. 4 and 5 show a partial exploded view of the magnetic grinding gauge 1 in various perspective views, with only the components attached to one of the sides of the system being shown in an exploded view.

[0034] Each of the contact elements 3 is attached to the body 2 of the magnetic grinding gauge 1 via a carrier 4. In particular, the carrier 4 supports the contact element 3 on one side and is connected to the body 2 on the opposite side. The carrier 4 comprises a carrier plate 4d and two connecting sections 4a formed on the carrier plate 4d for connection to the body 2.

[0035] As can be seen from Fig. 6, the contact element 3 is injection-molded onto the carrier plate 4d, wherein it encompasses the edge of the carrier plate 4a all the way around. Here, it is advantageous if the contact element is injection-molded onto the carrier plate 4d with as thin a wall as possible in order to reduce (shear) movements of the elastomer forming the contact element 3 as much as possible and consequently also to prevent movements of the blade resting on the contact element 3. The carrier 4 can be manufactured together with the contact element 3 in a two-component injection-molding process. For this purpose, the carrier 4 is first manufactured from a hard plastic, such as polypropylene. Subsequently, the soft elastomer forming the contact element 3 is injection-molded onto the carrier plate 4d. The connecting sections 4a are formed side by side as cylindrical sleeves on the carrier plate 4d such that they extend at right angles from the carrier plate 4d.The cylindrical sleeves are each provided with a toothing 4c on their outer circumference. The connecting sections 4a of a carrier 4 are pressed into receiving openings (bores) 2a formed in the contact side of the body 2. This creates a positive and non-positive connection between the carrier 4 and the body 2. The toothing 4c can also engage the body 2 or at least increase the pressure at the corresponding contact sections.

[0036] The carrier 4 also comprises two magnet receptacles 4b for receiving magnets 5, which generate the magnetic force required to attract the blade. One magnet receptacle 4b is formed in particular by the inner contour of the connecting section 4a, which is designed as a cylindrical sleeve. Accordingly, each magnet receptacle 4a is designed to receive a round magnet or a cylindrical magnet 5. The diameter of such a magnet 5 is, for example, 14 mm in the present embodiment. Since the magnets 5 are received inside the connecting sections 4a, they are also positioned in the corresponding receiving opening 2a of the body 2, as shown in Fig. 7. A magnet 5 can be inserted into a magnet receptacle 4b with a force fit and / or a form fit, but is captively received in the magnetic grinding gauge 1 simply due to its positioning in the receiving opening 2a of the body 2. As shown in Fig.As shown in Figure 7, a receiving opening 2a is only slightly longer than a connecting section 4a or a magnet receptacle 4b, so that the received magnet 5 can practically not deviate from its intended position. This also eliminates the need for a separate attachment of the magnet 5, for example, with adhesive.

[0037] Furthermore, the contact element 3 comprises a circumferential sealing lip 3a, which protrudes beyond the edge of the carrier plate 4 on the side of the carrier 4 facing the body 2 and rests against the contact side of the body 2.

[0038] List of reference symbols

[0039] 1 magnetic grinding gauge

[0040] 2 bodies

[0041] 2a Receiving opening

[0042] 3 elastic contact element

[0043] 3a Sealing lip

[0044] 4 carriers

[0045] 4a connecting section

[0046] 4b Magnetic holder

[0047] 4c Gearing

[0048] 4d carrier plate

[0049] 5 Magnet

[0050] 6 feet

Claims

Claims 1 . Magnetic grinding gauge (1), 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, comprising: a body (2), at least one elastic contact element (3) with which the magnetically attracted blade of the cutting tool comes into contact as intended, characterized by at least one carrier (4) which carries the elastic contact element (3) and which is connected to the body (2).

2. Magnetic grinding gauge (1) according to the preceding claim, characterized in that the elastic contact element (3) has a higher elasticity than the carrier (4) and / or the body (2).

3. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the elastic contact element (3) is sprayed onto the carrier (4), in particular onto a carrier plate (4d) of the carrier (4), wherein the elastic contact element (3) preferably encompasses an edge of the carrier (4) or the carrier plate (4d) at least in sections.

4. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the carrier (4) is connected to the body (2) in a force-fitting and / or form-fitting manner, in particular without adhesive.

5. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the carrier (4) has at least one connecting section (4a) for connection to the body (2), wherein the connecting section (4a) is preferably introduced, particularly preferably pressed, into a receiving opening (2a) of the body (2).

6. Magnetic grinding gauge (1) according to the preceding claim, characterized in that the connecting section (4a) is cylindrical, in particular is formed as a cylindrical sleeve on a carrier plate (4d) of the carrier (4), wherein the connecting section (4a) preferably has a toothing (4c) on its outer circumference which engages in the body (2) or at least is in contact with it.

7. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the carrier (4) comprises at least one magnet receptacle (4b) which receives a magnet (5) for generating the magnetic force, preferably in a form-fitting and / or force-fitting manner, wherein the magnet receptacle (4b) is particularly preferably formed by an inner contour of the connecting section (4a) according to claim 5.

8. Magnetic grinding gauge (1) according to the preceding claim, characterized in that the magnet (5) accommodated in the magnet receptacle (4b) is positioned in a receiving opening (2a) of the body (2).

9. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the carrier (4) consists of plastic, preferably polypropylene, and the body (2) particularly preferably consists of wood and / or metal.

10. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the elastic contact element (3) comprises a sealing lip (3a) which bears against the body (2), wherein the sealing lip (3a) is preferably designed to be circumferential.

11. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the body (2) has at least one contact side on which the carrier (4) is arranged together with the elastic contact element (3a), wherein the elastic contact element (3) partially covers or completely conceals the contact side.

12. Magnetic grinding gauge (1) according to one of the preceding claims, characterized in that the body (2) has an underside equipped with feet (6) and an upper side opposite the underside, on which a circumferential bevel is formed.

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