Power tool with disc-shaped tool and guard for protecting against flying sparks

Abstract

The invention relates to a power tool having a disc-shaped tool and a guard for protecting the power tool from flying sparks. Here, the guard has means for supporting a safe upright position of the power tool, wherein the means comprise an elastic material and can be preassembled on a tab of the guard. In another aspect, the invention relates to an assembly and a method for quickly mounting the guard and the means for supporting a safe upright position of the power tool to the power tool.

Description

Technical Field

[0001] This invention relates to a power tool having a disc-shaped tool and a guard plate for protecting the power tool from flying sparks. The guard plate includes means for supporting a safe upright position of the power tool, wherein these means comprise a resilient material and can be pre-assembled onto tabs of the guard plate. In another aspect, this invention relates to an assembly and a method for quickly installing a guard plate and the means for supporting a safe upright position of the power tool onto the power tool. Background Technology

[0002] In the field of power tools, abrasive wheel cutters are known, which can cut even hard substrates such as steel. Abrasive wheel cutters are also used for cutting steel, which typically requires special protection against the flying sparks generated during the cutting process. For this purpose, a guard plate is attached to the abrasive wheel cutter to prevent sparks from damaging vulnerable or flammable parts of the power tool or its housing. Furthermore, some abrasive wheel cutters are equipped with upright legs to ensure the device is in a good, non-slip, upright position during operation. To secure these upright legs to the device, in addition to screws, flat washers or similar materials are usually required to distribute the bearing force of the screws over a larger area of ​​the upright legs; otherwise, the upright legs would not be adequately secured. Moreover, this larger bearing area of ​​the fastening elements is necessary to prevent damage to the material of the upright legs due to vibrations during operation, such as cracking.

[0003] The purpose of this invention is to overcome the aforementioned defects and disadvantages of the prior art and to provide a power tool that, due to its large support area, allows the power tool to be in a safe and stable upright position. Furthermore, the provided solution is intended to be robust and durable, particularly in terms of the materials used. Additionally, the provided solution aims to enable simple and uncomplicated mounting on the power tool, while particularly desiring to reduce the number of parts such as screws and flat washers.

[0004] This objective is achieved through the subject matter of the independent claim. Advantageous embodiments relating to the subject matter of the independent claim can be found in the dependent claims. Summary of the Invention

[0005] According to the present invention, a power tool is provided having a disc-shaped tool and a guard plate for protecting the power tool from flying sparks. The power tool is characterized in that the guard plate includes means for supporting a safe upright position of the power tool, wherein these means comprise a resilient material and can be mounted or pre-assembled onto tabs of the guard plate. Tests have shown that by providing pre-assembleable means for supporting a safe upright position of the power tool, the aforementioned disadvantages of conventional upright legs can be minimized. This is particularly achieved by the fact that the means can be fastened to the power tool via the guard plate. Therefore, fastening screws and flat washers for fastening these means are eliminated. Furthermore, a separate installation step for fastening these means can be advantageously eliminated.

[0006] Power tools can be, in particular, abrasive wheel cutters, by means of which, for example, steel can be cut. Such abrasive wheel cutters preferably have a disc-shaped cutting disc, which, in the context of this invention, is referred to as the tool of an abrasive wheel cutter or the tool of a power tool. The cutting disc and the tool are typically enclosed in the abrasive wheel cutter by a protective cover to protect the user from debris and splashing coolant.

[0007] Preferably, the "device for supporting a power tool in a safe upright position" is also referred to as an "upright leg" or "rubber leg" in the context of this invention. In particular, the elastic material constituting the upright leg can be rubber. For the purposes of this invention, it is preferred that the elastic material be selected from the group consisting of hydrated acrylonitrile-butadiene rubber (HNBR), nitrile rubber (NBR), and / or fluororubber (FKM). These materials advantageously possess high UV stability and good thermal stability. Furthermore, these materials have exhibited exceptional weather resistance, thus allowing for easy outdoor use, for example, on construction sites.

[0008] HNBR material is particularly suitable for producing upright legs because it has good temperature stability up to 150°C. This is important because sparks may be generated during steel cutting, and the guard is designed to keep these sparks away from the device. However, sparks can cause the guard to overheat, so in the context of this invention, it is preferable to use the most heat-resistant material possible for the upright legs. Furthermore, HNBR is characterized by particularly good weather resistance. In addition, HNBR has very good abrasion resistance. HNBR is also a cost-effective production solution for upright legs. The guard of a power tool has tabs on which the upright legs can be pre-assembled. The front portion of the guard is typically located on the tool-facing side of the power tool housing to protect the power tool or its housing's vulnerable or flammable parts from the scattered sparks that may occur during steel cutting. Figure 1One possible attachment method for the guard plate is shown. For the purposes of this invention, it is particularly preferred that the guard plate be positioned near the space of the front handle of the grinding wheel cutter.

[0009] For the purposes of this invention, it is preferred that the front handle be in the form of a ring handle. The term "ring" is not unfamiliar to those skilled in the art, as they know that front handles in the field of power tools typically extend around the housing or body of the device. In other words, such a front handle at least partially surrounds the housing or body of the power tool, thereby enabling the user to stably guide the power tool. Secondly, the machine is effectively protected from mechanical damage by the preferred circumferential front handle, such as from impacts or drops. For the purposes of this invention, it is preferred that the lower portion of the guard plate, together with the upright legs, is arranged in the area on the underside of the front handle, wherein the underside preferably coincides with the underside of the housing or body of the power tool. Figure 2 One possible attachment method for the guard plate of a power tool is illustrated. For the purposes of this invention, it is preferred that the tabs at least partially form the lower portion of the guard plate. Thus, in the mounting position of the assembly consisting of the guard plate and the upright legs, the upright legs (which can be pushed onto the tabs of the guard plate) are advantageously located on the underside of the housing or body of the power tool, and therefore they can ensure a safe and stable upright position for the power tool.

[0010] In the case of a right-handed person, the front handle is typically gripped by the left hand. Larger machines, in particular, often have a second handle, which is referred to as the rear handle for the purposes of this invention. In the case of a right-handed person, the rear handle is typically gripped by the right hand. The rear handle is preferably in the form of a C-shaped or D-shaped handle. For the purposes of this invention, it is preferred that the power tool includes both a first front handle and a second rear handle. The rear handle preferably includes operating devices for the power tool, for example, to turn the power tool on or off or to change operating parameters.

[0011] The tabs of the guard plate can be arranged laterally on the guard plate to facilitate the mounting of the upright legs to the power tool. Therefore, the tabs are preferably also referred to as lateral tabs. For the purposes of this invention, it is preferable that the upright legs can be pre-assembled onto the guard plate, thereby forming an assembly that can be fastened to the power tool in a single working step. This greatly facilitates the attachment of the upright legs to the power tool. This assembly constitutes a second aspect of the invention and, in the context of this invention, is preferably also referred to as a pre-assembled assembly.

[0012] To facilitate mounting the upright foot to the guard plate, or preferably the lateral tabs of the guard plate, the upright foot may include slots into which the guard plate tabs can be inserted. In other words, the device for supporting a power tool in a safe upright position may have slots for receiving the guard plate tabs, wherein the upright foot can be laterally pushed onto the guard plate tabs. To ensure optimal positioning of the upright foot relative to the guard plate after pre-assembly, it is advantageous to provide defined end stops for the upright foot on the guard plate.

[0013] The connecting piece may have a protrusion to better hold the pre-assembled upright leg, thus allowing prestress to be applied to the upright leg even with a narrow slot width. The upright leg is preferably laterally secured by a raised circumferential mating profile on the housing portion. This can be achieved by protruding ribs on the power tool housing that surround the edge and enclose the upright leg. Therefore, the upright leg is securely and stably held to the power tool housing in two spatial directions. In other words, for the purposes of this invention, it is preferable that the power tool has a raised mating profile to fasten the upright leg to the guard plate. The power tool also includes a housing, wherein the mating profile for fastening the upright leg is formed by a protruding circumferential wall of the power tool housing.

[0014] Therefore, the installed upright legs cannot move freely relative to the device housing, and the upright legs in particular ensure a safe and stable upright position of the power tool on the substrate.

[0015] A significant advantage of this invention is that the upright legs can be secured to the power tool housing via a relatively large bearing surface. The relatively large bearing area of ​​the upright legs on the substrate is preferably further facilitated by the specific spatial configuration of the upright legs. Preferred embodiments of the upright legs are shown in the accompanying drawings. An upright leg configuration with a trapezoidal region is particularly preferred. Due to the relatively large bearing area, the risk of cracking in the upright leg material is significantly reduced, thus providing particularly robust and durable rubber upright legs for power tools. In particular, this invention eliminates the need for additional fastening screws and washers to secure the upright legs. Furthermore, the installation step of fastening the upright legs to the power tool housing can be eliminated, as this is advantageously accomplished by installing a pre-assembled assembly consisting of a guard plate and the upright legs.

[0016] For the purposes of this invention, it is preferred that the guard plate is L-shaped, having a front portion and a lower portion. Furthermore, it is preferable that the front portion and the lower portion enclose each other at an angle ranging from 70 to 110 degrees, preferably from 80 to 100 degrees, and most preferably from 85 to 95 degrees. The area between the front portion and the lower portion of the guard plate is formed by a circular portion of the material. In other words, the transition portion between the front portion and the lower portion of the guard plate can be configured as an arcuate surface, which can serve as a rolling surface. For the purposes of this invention, it is preferable that the transition portion between the front portion and the lower portion of the guard plate is configured as a large arcuate surface, for example, the arcuate surface enclosing an angle ranging from 70 to 110 degrees, preferably from 80 to 100 degrees, and most preferably from 85 to 95 degrees. The angle enclosed by the arcuate surface preferably corresponds to the angle enclosed by the front portion and the lower portion of the guard plate. When working with power tools, the arc surface can advantageously serve first as a rolling surface on the substrate during the cutting disc penetration and secondly as a scraper edge during the actual cutting process.

[0017] For the purposes of this invention, it is preferred that, when the guard plate or assembly is fastened to the power tool, the front region of the guard plate is arranged on the front side of the power tool's housing or body. For the purposes of this invention, it is further preferred that, when the guard plate or assembly is fastened to the power tool, the lower region of the guard plate is arranged on the lower side of the power tool's housing or body. Figure 1 and Figure 2 The image shows the corresponding arrangement when mounted on a power tool. The preferred L-shaped configuration of the guard plate allows for a stable attachment of the guard plate or component to the power tool. Furthermore, the preferred L-shaped configuration of the guard plate provides optimal protection for the vulnerable internal components of the power tool (preferably located within the tool's body), protecting against sparks that may fly during steel cutting.

[0018] For the purposes of this invention, it is preferable that the lower portion of the guard plate has at least one protrusion to enhance the flexural stiffness of the guard plate. The protrusion advantageously enhances the flexural stiffness of the lower portion of the guard plate, particularly in the area of ​​the joint where the upright leg is pushed. Furthermore, the at least one protrusion serves to increase the prestress on the upright leg, preventing it from falling off the joint after pre-assembly.

[0019] Furthermore, the front portion of the guard plate may also have at least one protrusion to enhance its flexural stiffness. For the purposes of this invention, it is particularly preferred that the front portion of the guard plate has three protrusions to further enhance its flexural stiffness. These three protrusions are shown in the accompanying drawings.

[0020] For the purposes of this invention, it is preferred that the upright leg has a generally trapezoidal area. Examples of possible specific shapes of the upright leg are shown in the accompanying drawings. Using an upright leg that is preferably formed symmetrically about a central axis allows the use of identical parts, thereby simplifying the production and processing of the upright leg.

[0021] For the purposes of this invention, it is particularly preferred that the power tool has two upright legs, wherein, in each case, one upright leg can be pushed to one side of the guard plate's tab. Therefore, when the power tool is placed on the upright legs, good stability of the power tool can be advantageously achieved.

[0022] On the other hand, the present invention relates to an assembly for quickly attaching a guard plate and upright legs to a power tool. The assembly includes a guard plate and upright legs, wherein the upright legs comprise a resilient material and can be pre-assembled or mounted on a tab of the guard plate. Advantageously, the assembly is also a separate component that can be purchased separately. The assembly can be pre-assembled, meaning that the upright legs are fastened to the tabs of the guard plate, and then the unit can be fastened to the power tool as a separate component.

[0023] On the other hand, the present invention relates to a method for quickly mounting a guard plate and upright foot onto a power tool. The terminology, definitions, and technical advantages introduced for power tools and components preferably also apply to the mounting method. This mounting method is characterized by the following steps:

[0024] a) Provide power tools,

[0025] b) Provide components including a guard plate and means for supporting a safe upright position for the power tool, wherein these means include a resilient material and are pre-assembled on tabs of the guard plate.

[0026] c) Install the components onto the power tool.

[0027] A significant advantage of this invention is that by pre-assembling the upright legs onto the guard plate, the installation of the upright legs onto the power tool can be significantly simplified and completed more quickly. For the purposes of this invention, it is preferred that this pre-assembly yields the proposed assembly, which specifically includes a guard plate and upright legs and is configured to be fastened to the power tool. For the purposes of this invention, it is particularly preferred that the pre-assembled assembly can be installed onto the bottom and front sides of the power tool's body. Here, the front portion of the guard plate is preferably installed on the front side of the power tool, with the front side facing the tool, while the lower portion of the guard plate is installed on the bottom side of the power tool, and in the pre-assembled state, upright legs are also arranged on this lower portion.

[0028] Further advantages will become apparent from the following description of the drawings. The drawings, description, and claims contain a number of combinations of features. Those skilled in the art will also readily consider these features individually and combine them to form other useful combinations. Attached Figure Description

[0029] In the accompanying drawings, identical and similar parts are numbered using the same reference numerals. In the accompanying drawings:

[0030] Figure 1 A view showing a preferred configuration of the proposed power tool is provided;

[0031] Figure 2 A view showing a preferred configuration of the bottom side of the proposed power tool is shown;

[0032] Figure 3 Views show preferred configurations of the guard plate with and without upright legs;

[0033] Figure 4 A view showing a preferred configuration of the upright support legs;

[0034] Figure 5 A view showing a preferred configuration of the components;

[0035] Figure 6 A view showing a preferred configuration of the mating profile on the housing of a power tool;

[0036] Figure 7 A view showing a preferred configuration of the upright support legs;

[0037] Figure 8 A view showing a preferred configuration of the components is provided. Detailed Implementation

[0038] Figure 1 The preferred configuration of the proposed power tool 1 is shown. Figure 1 The power tool 1 shown has a front annular handle and a rear handle. These handles surround the body of the power tool 1, which is enclosed by a housing 11. Furthermore, the power tool 1 has a tool 2, wherein a protective cover for the tool 2 is... Figure 1 The Chinese character is represented by reference numeral 2 in the attached figure. Figure 1 The power tool 1 shown is an abrasive wheel cutter, which is preferably configured to introduce a cut into hard materials such as concrete and steel. The tool 2 of this abrasive wheel cutter 1 is typically disc-shaped and is referred to as a cutting disc.

[0039] The front and rear annular handles of the power tool 1 preferably define spatial directions of "front" and "rear," and "front side" and "rear side." For the purposes of this invention, it is preferred that the body of the power tool 1 has a front side arranged in the region of the front annular handle. The front side of the body of the power tool 1 is preferably arranged such that it faces the tool 2 of the power tool 1. A pre-assembled assembly 10 is present in the lower region of the body of the power tool 1, which in particular includes a guard plate 3 and upright legs 4. Pre-assembly of the assembly 10 involves pushing the upright legs 4 onto the tabs 5 of the guard plate 3, such that the upright legs are held in place by the guard plate 3. For this purpose, the upright legs 4 may have slots 8 configured to receive the lateral tabs 5 of the guard plate 3. The pre-assembled assembly 10, consisting of the guard plate 3 and the upright legs 4, can be fastened to the power tool 1 in a particularly simple and uncomplicated manner. The upright support 4 is made of an elastic material (such as rubber), or includes such an elastic material. Because the material of the upright support 4 is elastic, the power tool 1 equipped with component 10 has a safe and stable upright position and can be placed on the substrate in a particularly non-slip manner.

[0040] The guard plate 3 is L-shaped, having a front portion 6 and a lower portion 7, wherein the front portion 6 and the lower portion 7 of the guard plate 3 form an approximately right angle with each other. This angle can be, for example, 85 degrees, 90 degrees, or 93 degrees. For the purposes of this invention, it is preferred that, in the installed state, the front portion 6 of the guard plate 3 is arranged on the front side of the body of the power tool 1, and in the installed state, the lower portion 7 of the guard plate 3 is arranged on the bottom side of the power tool 1.

[0041] Figure 2 A preferred configuration of the underside of the proposed power tool 1 is shown. In particular, the lower portion 7 of the guard plate 3 can be seen, wherein, especially, the tabs 5 for securing the upright legs 4 are arranged on this lower portion 7 of the guard plate 3. Figure 3 This was also specifically showcased. Furthermore, such as Figure 2 As shown, the guard plate 3 can be fastened to the power tool 1 or the power tool housing 11 using two fastening screws. Figure 2 In the lower left area, you can see tool 2 of power tool 1 or the protective cover of that tool.

[0042] Figure 3 Preferred configurations of the guard plate 3 with upright legs 4 (top) and without upright legs 4 (bottom) are shown. Figure 3 The upper part shows the guard plate 3 and its components—the front portion 6, the lower portion 7, and the connecting pieces 5, which are preferably located on the lower portion 7 of the guard plate 3, and particularly preferably on the side of the lower portion 7. Specifically, Figure 3The upper part shows the guard plate 3 and the lateral tabs 5 for securing the upright support legs 4. Figure 3 The lower half shows the fully pre-assembled assembly 10, where the upright legs 4 have been secured to the tabs 5 of the guard plate 3. The upright legs 4 may have slots 8 by means of which the upright legs 4 can be pushed onto the tabs 5 of the lower portion 7 of the guard plate 3. Therefore, Figure 3 The diagram illustrates the pre-assembly of the upright support 4 by pushing it onto the tab 5 of the guard plate 3. This yields the pre-assembled assembly 10.

[0043] Figure 4 A preferred configuration of the upright support 4 and its slot 8 is shown, into which the tab 5 of the guard plate 3 can be inserted.

[0044] Figure 5 A preferred configuration of component 10, mounted on power tool 1, is shown. The guard plate 3, or the front portion 6 and lower portion 7 of the guard plate 3, and the upright support legs 4 are visible. Specifically, Figure 5 A view of the preferred configuration of the bottom side of the proposed power tool 1 is provided.

[0045] Figure 6 A preferred configuration of the mating profile 9 on the housing 11 of the power tool 1 is shown. The mating profile 9 is preferably located on the bottom side of the power tool 1. For the purposes of the invention, it is preferred that the mating profile 9 is raised and configured to secure the guard plate 3 of the power tool 1. For the purposes of the invention, it is particularly preferred that the mating profile 9 is formed by a raised circumferential wall on the housing 11 of the power tool 1. This wall advantageously ensures that the upright legs 4 are laterally guided within the housing 11.

[0046] Figure 7 A preferred configuration of the upright legs 4 is shown, by which a particularly safe and stable upright position of the power tool 1 can be achieved. Furthermore, the anti-slip properties of the power tool 1 can be significantly improved by the upright legs 4. A significant advantage of the present invention is that by pre-assembling the upright legs 4 onto the guard plate 3, the installation of the upright legs 4 onto the power tool 1 can be significantly simplified and completed more quickly, wherein the pre-assembly of the upright legs 4 and the guard plate 3 enables the acquisition of the proposed component 10.

[0047] Figure 8 A preferred configuration of component 10 not mounted on power tool 1 is shown. Figure 8 The component 10 shown is pre-assembled, which means that the upright leg 4 has been installed on the lateral tab 5 of the guard plate 3. However, the component 10 obtained in this way is not installed on the power tool 1, so the corresponding state is referred to as "not installed".

[0048] List of reference numerals

[0049] 1 Power tools

[0050] 2 tools

[0051] 3. Protective Plate

[0052] 4. Upright support legs

[0053] 5. Connecting pieces of the protective plate

[0054] 6. Front part of the guard plate

[0055] 7. Lower part of the guard plate

[0056] 8. Slots for receiving the tabs of the protective plate

[0057] 9. Fitting profile for fastening upright legs

[0058] 10 components

[0059] 11. Shell

[0060] 12 Protrusions

[0061] 13. Arc surface

Claims

1. A power tool (1) having a disc-shaped tool (2) and a guard (3) for protecting the power tool (1) from stray sparks. in, The guard plate (3) includes devices (4) for supporting the power tool (1) in a safe upright position, wherein these devices (4) comprise an elastic material and are mountable onto a tab (5) of the guard plate (3), characterized in that... These devices (4) used to support the power tool (1) in a safe upright position can be pushed laterally onto the tabs (5) of the guard plate (3) and fastened to the guard plate (3) by the mating profile (9) formed by the protruding circumferential wall of the housing (11) of the power tool (1).

2. The power tool (1) as described in claim 1. Its features are, The guard plate (3) is L-shaped and has a front part (6) and a lower part (7).

3. The power tool (1) as described in claim 2. Its features are, These tabs (5) are part of the lower part (7) of the guard plate (3).

4. The power tool (1) as described in any one of claims 2 and 3. Its features are, The lower portion (7) of the guard plate (3) has at least one protrusion (12) to enhance the flexural stiffness of the guard plate (3).

5. The power tool (1) as described in any one of claims 2 to 3. Its features are, The front portion (6) of the guard plate (3) has at least one protrusion (12) to enhance the flexural stiffness of the guard plate (3).

6. The power tool (1) as described in claim 5. Its features are, The front portion (6) of the guard plate (3) has three protrusions (12).

7. The power tool (1) as described in any one of claims 2 to 3. Its features are, The transition portion between the front portion (6) and the lower portion (7) of the guard plate (3) is configured as an arc surface (13), wherein the arc surface (13) can be used as a rolling surface.

8. The power tool (1) according to any one of claims 1 to 3. Its features are, These devices (4) used to support the power tool (1) in a safe upright position have trapezoidal areas.

9. The power tool (1) according to any one of claims 1 to 3. Its features are, These devices (4) for supporting the power tool (1) in a safe upright position have slots (8) for receiving the tabs of the guard plate.

10. The power tool (1) according to any one of claims 1 to 3. Its features are, The mating profile (9) is designed as a raised mating profile.

11. The power tool (1) according to any one of claims 1 to 3. Its features are, The power tool (1) has two devices (4) for supporting the power tool (1) in a safe upright position.

12. A component (10) for quickly attaching a guard plate (3) and a device (4) for supporting a power tool (1) in a safe upright position to the power tool (1), in, The component (10) includes a guard plate (3) and means (4) for supporting the power tool (1) in a safe upright position, wherein the means (4) comprises an elastic material and can be mounted on a tab (5) of the guard plate (3), characterized in that the means (4) for supporting the power tool (1) in a safe upright position can be laterally pushed onto the tab (5) of the guard plate (3) and fastened to the guard plate (3) by a mating profile (9) formed by the protruding circumferential wall of the housing (11) of the power tool (1).

13. A method for quickly installing a guard plate (3) and a device (4) for supporting a power tool (1) in a safe upright position onto the power tool (1), characterized in that... The following are the steps: a) Provide power tools (1), b) Provide an assembly (10) comprising a guard plate (3) and means (4) for supporting the power tool (1) in a safe upright position, wherein the means (4) comprises an elastic material and is pre-assembled on a tab (5) of the guard plate (3), wherein the means (4) for supporting the power tool (1) in a safe upright position can be laterally pushed onto the tab (5) of the guard plate (3) and fastened to the guard plate (3) by a mating profile (9) formed by the protruding circumferential wall of the housing (11) of the power tool (1). c) Install the component (10) onto the power tool (1).

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