Tool and method for surface treatment

Abstract

The invention relates to a tool (100) for surface treatment of a workpiece (102). The tool (100) has: a shaft (106) for coupling to a drive means (108) and for rotationally driving the tool (100) about an axis of rotation (R); at least two round treatment blanks (110) arranged on the shaft (106); and wherein the round treatment blanks (110) are spaced apart from one another at a distance (a) in the direction of the axis or rotation (R). The invention also relates to a method for surface treatment with such a tool (100).

Description

[0001] Lukas-Erzett GmbH & Co. KG 26 November 2025 Gebrüder-Lukas-Straße 1 Mü / Hü (2025022595)

[0002] Q23521WO10

[0003] 51766 Engelskirchen

[0004] Tools and methods for surface treatment

[0005] Description

[0006] The invention relates to a surface treatment tool comprising a shaft for coupling with a drive means and for rotating the tool about an axis of rotation, and at least two nonwoven discs arranged on the shaft, wherein the nonwoven discs extend orthogonally to the axis of rotation and radially around the axis of rotation; and wherein the nonwoven discs are spaced apart from each other on the shaft side in the direction of the axis of rotation. The invention further relates to a method for treating the surface of a workpiece.

[0007] The surface treatment of workpieces is often subject to various conditions or associated with problems. Rotating tools are known for this purpose; these are mounted on a drive unit (e.g., cordless screwdriver or angle grinder) and used for surface treatment, in particular for cleaning, optical enhancement, or preparation for further surface treatment.

[0008] These tools are typically suitable not only for geometrically simple surfaces, i.e., flat or non-curved surfaces, but also for surfaces that are more difficult to treat with purely flat tools, such as the surfaces of grids, railings, cages, or bars. A typical application is, for example, the surface treatment, especially the cleaning, of a grill grate.

[0009] German patent DE 29804213 U1 discloses a rotary-driven grinding, cleaning, or polishing tool with an axle. The axle has a clamping pin for insertion into a chuck of a rotary drive machine. Generally, there are few cleaning machines available for grill cleaning. Especially in private households, a grill grate is usually cleaned only with a sponge or a simple kitchen brush, or perhaps wire brushes from a grilling supply store, after first roughly scraping off thicker deposits.

[0010] The invention is therefore based on the objective of providing a tool and a method for surface treatment with which a surface, in particular a grill grate, can be treated, in particular cleaned, simply and efficiently.

[0011] With regard to the tool for surface treatment, the problem is solved according to the invention by a tool having the features of claim 1. With regard to the method for surface treatment, the problem is solved according to the invention by a method having the features of claim 11. Preferred embodiments, further developments and variants are the subject of the dependent claims.

[0012] The advantages and preferred designs listed with regard to the tool are to be applied analogously to the process and vice versa.

[0013] The tool for surface treatment of a workpiece has a shaft for coupling with a drive mechanism and for rotating the tool around an axis of rotation. Furthermore, the tool has at least two treatment discs arranged on the shaft. The treatment discs are spaced apart from each other in the direction of the axis of rotation.

[0014] For the purposes of this application, the term "disc" can generally be understood as a flat, circular disc used in the processing, in particular surface treatment, of workpieces. Discs are usually clamped into an electric drive and set in rotation in order to subsequently treat the surface, e.g., by polishing, grinding, or cleaning.

[0015] The aforementioned tool, in conjunction with the drive mechanism, offers significant improvements compared to prior art cleaning tools, particularly when the workpiece is a grill grate. The user requires minimal force and precision to clean the grill grate bars. Simultaneously, the tool thoroughly cleans the grill grate bars, not only on the top but also on the sides and even the underside.

[0016] This is achieved by the fact that, when using the tool according to the invention, the at least two treatment discs preferably at least partially enclose the respective rod of the grill grate to be cleaned, thus enabling it to be cleaned completely. In other words, when cleaning the grill grate, the rod is positioned between the two rotating treatment discs and is therefore cleaned simply and efficiently.

[0017] According to one embodiment, at least one intermediate round is arranged between the at least two treatment rounds. This embodiment improves the comprehensive cleaning of each grill grate bar, since the two treatment rounds can preferably clean the sides and underside of the bar, and the intermediate round can clean the top side of the bar.

[0018] It can also be advantageous if the at least two treatment discs and the at least one intermediate disc differ in their mechanical, chemical, geometric, and / or physical properties. The advantage of this embodiment lies in the adaptability of the tool to various treatment requirements. Furthermore, several treatment aspects can be addressed simultaneously with such a tool. For example, the at least one intermediate disc can have a harder material to remove coarser and more stubborn contaminants, while the at least two treatment discs have a softer and / or more absorbent material to absorb lighter contaminants and, if necessary, to polish the workpiece.

[0019] In a further embodiment, the at least one intermediate disc is made of a foamed, rubber-like, open-pored, and / or wire-like material and / or a nonwoven material and / or is designed as a brush. For example, the intermediate disc has mesh fabric and / or wire and / or plastic mesh or is designed as mesh fabric and / or as wire and / or plastic mesh.

[0020] Furthermore, the intermediate disc can be designed as a brush with bristles made of materials such as sisal and / or hemp and / or leather and / or plastic (e.g., such as PA and / or PE). Alternatively or additionally, the brush can have metal bristles made of brass and / or steel and / or stainless steel and / or aluminum. It is also conceivable that the intermediate disc has a combination of the aforementioned materials and / or designs. In addition, the at least one intermediate disc can also be designed as a folded ring, as is known, for example, from polishing tools.

[0021] The various configurations described above allow the at least one intermediate disc to be adapted to different areas of application.

[0022] According to one embodiment, the at least two treatment discs have a nonwoven material or are made of a nonwoven material. Nonwovens have proven particularly advantageous in the cleaning of workpieces. Brushes tend to cause unwanted splashing (even without an electric drive, i.e., even with manual handling). In contrast, nonwoven-based tools are more sponge-like and therefore able to absorb both cleaning agents and dissolved contaminants much better than brushes.

[0023] According to a further development, a multitude of treatment discs and intermediate discs are arranged alternately one behind the other in the direction of the axis of rotation. Additionally, the treatment discs and / or intermediate discs can also be multi-part. That is, the treatment discs and / or intermediate discs can consist of several discs that are directly adjacent to or arranged in close proximity to one another. A treatment disc and / or an intermediate disc thus then consists of a group of discs that are designed either according to the treatment disc and / or the intermediate disc. This embodiment allows, for example, several parallel rods to be cleaned simultaneously.

[0024] In another embodiment, the at least one intermediate disc has a smaller diameter than the treatment disc. In other words, for example, every second disc can have a smaller diameter, allowing the larger discs (e.g., the treatment discs) to fit between the grating bars and clean there without increased pressure, while the smaller discs (e.g., the intermediate discs) rest on the top of the grating bars and clean there.

[0025] According to one embodiment, at least one treatment disc and / or at least one intermediate disc has or has a material for receiving a surface treatment agent or is made of such a material.

[0026] The surface treatment agent is preferably a cleaning agent for the surface, in particular the grill grate. Non-restrictive examples of such a material are soaps or alkalis. According to a preferred embodiment, at least one of the at least two treatment discs and / or the intermediate disc is impregnated or coated with a (solid) cleaning agent. This eliminates the need for an additional, i.e., external, cleaning agent. Alternatively, only the at least one intermediate disc contains the surface treatment agent, in particular the cleaning agent. If the discs are pressed together with sufficient force, the at least one inner (small) intermediate disc between the significantly larger treatment discs is no longer visible from the outside. This allows the large treatment discs to form a splash guard against the cleaning agent with which the at least one inner intermediate disc is impregnated or coated.are coated.

[0027] Alternatively or additionally, the surface treatment agent can also be a care product, such as oil, especially linseed oil, or other vegetable oils, or a seasoning agent for a grill grate. This can be used to maintain the surface, especially the grill grate. Furthermore, alternatively or additionally, the surface treatment agent can be a protective agent, such as a rust inhibitor, or other types of liquid, viscous, and possibly solid substances, e.g., salt, and / or mixtures (e.g., liquids with impregnating solids). This agent can protect the surface, especially the grill grate, from aging and weathering.

[0028] Furthermore, it can be advantageous if the at least two treatment discs and / or the at least one intermediate disc are made of an adhesive material for the adhesion of the cleaning agent and / or of an abrasive material for grinding and / or polishing and / or cleaning. For example, the bristles of the at least one intermediate disc, which is designed as a brush, can consist of a material combination. For example, plastic bristles can contain abrasive grit and / or be additionally coated with, for example, a solid cleaning agent. Alternatively, the bristles of the brush disc can also be embedded together in a preferably solid matrix made of, for example, a wax-like cleaning and / or surface treatment agent.

[0029] Furthermore, according to one embodiment, a sheathing or embedding of the bristles can also serve to protect the bristles themselves, for example the metallic core of a metal brush, in order to prevent premature breakage or to reduce the risk of injury to the user at the tips of the bristles.

[0030] In a further supplementary or alternative embodiment, the at least one (inner) intermediate disc can also consist of a foamed or rubber-like material, for example a polishing disc made of polyurethane or an open-cell foam.

[0031] In another variant, at least one (inner) intermediate layer consists of an absorbent foam, similar to a cleaning sponge used in the home for cleaning pots and bottles. Alternatively, a polyurethane layer made of largely closed-cell foam can be used. Advantageously, during the manufacturing of this layer, additional additives with an additional effect or function can be incorporated within the foam itself, such as abrasive grit or solid or liquid (encapsulated) cleaning agents, care products, and / or fragrances.

[0032] In a general embodiment, the at least two treatment discs have a different property and therefore a different function in surface treatment than the at least one intermediate disc.

[0033] According to one embodiment, the distance between the at least two treatment discs is greater in a region facing the axis of rotation than in a region facing away from the axis of rotation. In other words, the at least two treatment discs taper conically towards the shaft. The advantage of this embodiment is that the at least two treatment discs can serve as improved splash protection.

[0034] In this advanced training, at least two treatment discs and / or at least two treatment discs and at least one intermediate disc are clamped rotationally axially along the shaft. Thus, the discs are not glued to the shaft, but rather clamped to it. This clamping can be achieved, for example, using a clamping element or device. A support disc can serve as the clamping element. The support disc can, for example, be designed as an end piece and may also have a disc-shaped geometry. Furthermore, this end piece can be made of any material suitable for securing or clamping the discs. Besides materials such as metals, plastics or natural materials such as wood, as well as combinations thereof, are also conceivable.

[0035] By releasing the clamping force, the user can also change the discs themselves or modify the arrangement according to their needs. Furthermore, in this embodiment, the shaft can continue to be used even after the discs need to be replaced. To further improve the splash protection or splash-proof effect of the tool, one embodiment clamps the at least two treatment discs and the at least one intermediate disc rotationally relative to each other in such a way that the at least two nonwoven discs enclose the at least one intermediate disc. This is particularly useful in applications where as little dust or contamination as possible is desired, but extraction is impractical or insufficient.

[0036] For example, this can be helpful when stripping paint from a railing. Alternatively, processing a stainless steel rod with an abrasive (cryolite, KBF4, etc.) can be advantageously facilitated in at least one (inner) intermediate disc. This intermediate disc thus forms a reservoir for the necessary additives. The at least two (outer) treatment discs, which do not contain these substances, at least not in the required type and / or quantity, at least in their outer areas, serve as protection for the user and the immediate surroundings.

[0037] In a further advantageous embodiment, the at least two treatment discs have a property that retains, binds, or absorbs abrasion, dust, liquid, etc. particularly well. This can be, for example, a liquid-absorbing or binding material instead of an ordinary abrasive fleece. Optionally, this material can also be located on or within the at least two treatment discs.

[0038] According to one embodiment, the shaft has an outer contour that deviates from a circle, in particular a hexagonal outer contour, at least along a section in the direction of the axis of rotation, wherein the at least two treatment discs and / or the at least one intermediate disc can be positively connected to the shaft. The section in question is, in particular, the section in which the discs are arranged on the shaft. This embodiment prevents the at least two treatment discs and / or the at least one intermediate disc from "rotating" during operation of the drive mechanism. Furthermore, it can be advantageous if the shaft has a thickening at an end opposite a coupling area of ​​the shaft. For the purposes of this application, the coupling area can be understood as the area of ​​the shaft that is inserted into a drill chuck of the drive machine and clamped there.For the purposes of this application, the term "thickening" can therefore be understood to mean, for example, that the shaft has a conical widening when viewed from the coupling area and along the axis of rotation.

[0039] Thus, the at least two treatment discs and / or the at least one intermediate disc can only be arranged on the shaft from the coupling area, in particular pushed on, so that there is no risk of the discs flying off unintentionally when using the tool.

[0040] The method for treating the surface of a workpiece comprises the following steps: a) providing a tool for surface treatment and a workpiece to be surface treated; b) rotating the at least two treatment discs via the shaft by means of a drive means; c) arranging the workpiece between the at least two treatment discs, whereby the surface of the workpiece is treated by rotating the treatment discs.

[0041] The tool in question is preferably the tool already described above.

[0042] According to one embodiment of the method, in step a) at least one intermediate disc is arranged between the at least two treatment discs, wherein in step c) the surface of the workpiece is simultaneously arranged between the at least two treatment discs and the at least one intermediate disc.

[0043] Preferred embodiments of a surface treatment tool according to the invention are explained in more detail below with reference to the figures. These show:

[0044] Fig. 1 shows a schematic side view of the tool according to the invention in a first embodiment and in the state arranged on a drive means;

[0045] Fig. 2 shows a schematic side view of the tool according to a second embodiment and in the state arranged on a drive means;

[0046] Fig. 3 shows a schematic side view of the tool according to a third embodiment and in the state arranged on a drive means; and

[0047] Fig. 4 shows a schematic side view of the tool according to a fourth embodiment and in the state arranged on a drive means.

[0048] In the figures, identical or equivalent components are always represented with the same reference symbols.

[0049] Fig. 1 shows a tool 100 for surface treatment of a workpiece 102 according to a first embodiment. In the embodiments shown, the workpiece 102 is a rod 104 of a grill grate (not shown). However, it is understood that the tool 100 according to the invention is not limited to such an application and can also be used for the treatment of other workpieces 102.

[0050] The tool 100 has a shaft 106. The shaft 106 serves to couple the tool 100 to a drive element 108. The drive element 108 is preferably an electric drive element 108. The drive element 108, shown schematically as a rectangle in the figures, could therefore, for example, be a cordless screwdriver. The coupling with the tool 100 is then preferably effected via the chuck of the cordless screwdriver, which receives and clamps a coupling section of the shaft 106.

[0051] The electric drive 108 therefore also serves to drive the tool 100 in a rotating motion around a rotational axis R.

[0052] The tool 100 according to the embodiment shown in Fig. 1 has two treatment discs 110 arranged on the shaft 106, in particular clamped to the shaft 106. The treatment discs 110 each extend orthogonally to the axis of rotation R and radially around the axis of rotation R. In other words, the treatment discs 110 are disc-shaped. Furthermore, the treatment discs 110 are spaced apart from each other on the shaft 106 at a distance a. Due to the arrangement on the shaft 106, the rod 104 of the grill grate to be treated can be positioned between the two treatment discs 110, as shown in Fig. 1, and thus be treated reliably and easily, for example, cleaned. In particular, the spaces between a grill grate, i.e., the area between two adjacent rods 104, can be cleaned very thoroughly and easily by the tool 100 according to the invention.

[0053] The treatment discs 110 are preferably made of non-woven material. Alternatively, the treatment discs 110 can also be made of a different material.

[0054] Fig. 2 shows a side view of a second embodiment of the tool 100. This is a further development of the tool 100 shown in Fig. 1. Essentially, the tool 100 according to Fig. 2 has the same components as the tool 100 according to the embodiment shown in Fig. 1. The tool 100 thus has a shaft 106 and two treatment discs 110 spaced apart on the shaft 106. The tool 100 is also connected to the drive means 108, in particular by coupling.

[0055] In addition, the tool 100, according to the embodiment shown in Fig. 2, has an intermediate disc 112. The intermediate disc 112 is arranged between the two treatment discs 110 on the shank 106. Furthermore, the intermediate disc 112 has a smaller diameter than the two treatment discs 110. Preferably, the diameter of the intermediate disc 112 corresponds to one-quarter, one-third, one-half, or at most two-thirds of the diameter of the treatment discs 110.

[0056] Furthermore, the material of the intermediate disc 112 and the material of the treatment discs 110 can differ in order to cover various treatment aspects. Alternatively, the intermediate disc 112 and the two treatment discs 110 can be made of the same material.

[0057] This embodiment further improves the surface treatment, in particular the cleaning of the workpiece 102, since the intermediate disc 112 can treat, and preferably clean, a top surface of the workpiece 102, in particular the rod 104 of the grill grate.

[0058] Furthermore, the embodiment of tool 100 of Fig. 2 corresponds in terms of structure and function to the embodiment of tool shown in Fig. 1, so that reference is made to its description.

[0059] Fig. 3 shows a third embodiment of the tool 100 according to the invention in a side view.

[0060] In this embodiment, a total of four treatment discs 110 are arranged on the shaft 106. An intermediate disc 112 is arranged between each pair of treatment discs 110, so that the tool 100, according to the embodiment shown in Fig. 3, has a total of three intermediate discs 112.

[0061] This design allows up to three rods 104 of the workpiece 102 designed as a grill grate to be treated, in particular cleaned.

[0062] Furthermore, the various discs 110, 112 can have different materials and / or properties. For example, the intermediate discs 112 can be impregnated with a cleaning agent, while the treatment discs 110 are designed as nonwoven discs. Otherwise, the embodiment of the tool 100 in Fig. 3 corresponds in terms of structure and function to the embodiments of the tool shown in Figs. 1 and 2, so reference is made to their descriptions.

[0063] With reference to Fig. 4, a fourth embodiment of the tool 100 according to the invention is shown in a side view.

[0064] In this embodiment, the tool 100 has three treatment discs 110 and two intermediate discs 112, with one intermediate disc 112 being arranged between two treatment discs 110 on the shaft 106.

[0065] In addition, the discs 110, 112 are clamped against each other in the axial direction, i.e. along the axis of rotation R, by means of two clamping elements 114, in order to prevent the discs 110, 112 from coming loose during rotation.

[0066] Furthermore, in the embodiment shown in Fig. 4, the treatment discs 110 are designed such that the distance a at a radial outer end (i.e., the end furthest from the shaft 106) of the treatment discs 110 is smaller than at a radial inner end (i.e., the end closest to the shaft 106) of the treatment discs 110. In other words, the outer contour of the treatment discs 110 tapers conically from the outer end to the inner end (viewed in the direction of the shaft 106). This design provides the treatment discs 110 with an additional splash guard during treatment, particularly cleaning, of the rods 104 of the workpiece 102, since the treatment discs 110 at least partially enclose the rods 104.

[0067] The features of the invention disclosed in this description, in the drawings, and in the claims can be essential for realizing the invention in its various embodiments, both individually and in any combination. The invention can be varied within the scope of the claims and taking into account the knowledge of the person skilled in the art. List of reference numerals

[0068] 100 tools

[0069] 102 workpieces

[0070] 104 rods of a grill grate

[0071] 106 shaft

[0072] 108 electric drive devices

[0073] 110 treatment rounds

[0074] 112 Intermediate rounds

[0075] 114 Tensioning element

[0076] R axis of rotation

Claims

Lukas-Erzett GmbH & Co. KG November 26, 2025 Gebrüder-Lukas-Straße 1 Mü / Hü (2025022595) Q23521WO10 51766 Engelskirchen Tools and methods for surface treatment Claims 1. Tool (100) for surface treatment of a workpiece (102) comprising: a shaft (106) for coupling with a drive means (108) and for rotating the tool (100) about an axis of rotation (R), at least two treatment discs (110) arranged on the shaft (106), and wherein the treatment discs (110) are spaced apart from each other in the direction of the axis of rotation (R) by a distance (a).

2. Tool (100) according to claim 1 , characterized in that at least one intermediate disc (112) is arranged between the at least two treatment discs (110).

3. Tool (100) according to claim 2, characterized in that the at least two treatment discs (110) and the at least one intermediate disc (112) differ in their mechanical, chemical, geometric and / or physical properties.

4. Tool (100) according to claim 2 or 3, characterized in that the at least one intermediate disc (112) is made of a foamed, rubber-like, open-pored and / or wire-shaped material and / or a nonwoven material and / or is designed as a brush.

5. Tool (100) according to one of claims 1 to 4, characterized in that at least two treatment discs (110) have a nonwoven material or are made of a nonwoven material.

6. Tool (100) according to one of claims 1 to 5 and 2, characterized in that a plurality of treatment discs (110) and intermediate discs (112) are arranged alternately one behind the other in the direction of the axis of rotation (R).

7. Tool (100) according to one of claims 1 to 6 and 2, characterized in that the at least one intermediate disc (112) has a smaller diameter than the treatment discs (100).

8. Tool (100) according to one of claims 1 to 7 and 2, characterized in that at least one treatment disc (110) and / or at least one intermediate disc (112) has or has a material for receiving a surface treatment agent or is made or is made of such a material.

9. Tool (100) according to one of claims 1 to 8, characterized in that the distance (a) between the at least two treatment discs (110) in a region facing the axis of rotation (R) is greater than in a region facing away from the axis of rotation (R).

10. Tool (100) according to one of claims 1 to 9 and 2, characterized in that the shaft (106) extends at least along a section in the direction of the Ro- The tation axis (R) has an outer contour that deviates from a circle, in particular a hexagonal one, wherein the at least two treatment discs (110) and / or the at least one intermediate disc (112) are or is positively connected to the shaft (106).

11. Method for treating the surface of a workpiece (102), wherein the method comprises at least the following steps: a) providing a tool (100) for surface treatment according to one of claims 1 to 10 and a workpiece (102) to be surface treated; b) rotatingly driving the at least two treatment discs (110) via the shaft (106) by means of a drive means (108); c) arranging the workpiece (102) between the at least two treatment discs (110), wherein the surface of the workpiece (102) is treated by rotating the treatment discs (110).

12. Method according to claim 11, characterized in that in step a) at least one intermediate disc (112) is arranged between the at least two treatment discs (110), wherein in step c) the surface of the workpiece (102) is arranged simultaneously between the at least two treatment discs (110) and the at least one intermediate disc (112).

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