Dust cover for a tool

Description

[0001] The present invention relates to a dust hood for a power tool, wherein the dust hood comprises an extraction area into which a suction hose from a vacuum cleaner opens. The dust hood has a curvature in the extraction area, the curvature of which can split or deflect an impulse pulse generated during a filter cleaning process of a vacuum cleaner by means of reflection.

[0002] Working with power tools such as drills, angle grinders, or slotting tools regularly generates dust that can be hazardous to human health, especially if inhaled. Dust hoods are known in the art for enclosing the working parts of such tools, such as drill bits, chisels, or cutting discs. These dust hoods preferably serve to collect the dust generated during operation. Preferably, the dust hoods can be connected to a vacuum cleaner or dust extractor so that the dust collected in the dust hood can be extracted. This is typically achieved by creating a vacuum, which is transmitted to the dust hood via a suction hose. Preferably, the dust hoods have a connection for the vacuum cleaner or dust extractor.The dust extractor has a suction hose connection, in the area of ​​which the suction hose opens into the dust hood. This area of ​​the dust hood is preferably referred to as the extraction area for the purposes of the invention.

[0003] With conventional dust hoods known from the prior art, dust leaks can occur. Such dust leaks are known, for example, when the conventional dust hoods are connected to slotting tools. Slotting tools, as defined in the invention, are preferably configured to create a slot, for example, in a wall, in order to lay cables in the "knocked" slot. The problem with the occurrence of leaks, through which dust from the conventional dust hoods can escape to the outside, i.e., into the environment, is that the relevant approval standards prescribe increasingly lower limits for dust emission, which cannot be met, or can only be met with great difficulty, with leaking dust hoods.In particular, leaks can adversely affect the system, preventing sufficient dust from being kept away from the operator of the tool, resulting in the operator inhaling the dust and potentially entering their respiratory tract. This dust often includes particles so small that they can penetrate deep into the lungs. Other dust particles may be hazardous to health or carcinogenic.

[0004] Dust is often observed escaping from conventional dust hoods, particularly during filter cleaning. Filter cleaning removes dust that has accumulated in the filter during operation. This dust can form a filter cake, which is removed during the cleaning process. For example, the vacuum cleaner's suction may be briefly interrupted during cleaning, causing a pressure surge that acts on the filter. This pressure surge can loosen or detach the filter cake. In other cases, the filter may be actively blown through with a counter-flow of air, which also dislodges the filter cake.These measures can be performed once or repeated in a cleaning cycle. For example, a cleaning cycle for a vacuum cleaner might consist of three cleaning strokes. A cleaning cycle can be initiated automatically at regular intervals or controlled as needed.

[0005] Since the cleaning process frequently involves (pressure) shocks being exerted on the filter, the invention preferably refers to this as a tapping process. This tapping process often causes a recoil in the suction hose or into the interior of the dust hood, which, in conventional dust hoods known from the prior art, can undesirably lead to the emission of a dust cloud.

[0006] For example, DE 2 943 001 A1 discloses a sawing device with a chip extraction device.

[0007] US 2018 236 574 A1 describes a portable cutting device with a dust collection nozzle for connecting a dust collection device.

[0008] EP 1 266 720 A2 discloses a dust collector comprising an upper channel and a flexible lower flap, wherein the lower flap is connected to the upper dust channel and is also elastically designed.

[0009] The object of the present invention is to overcome the disadvantages of the prior art described above and to provide a dust hood for a power tool that is particularly airtight and effectively prevents dust from entering the respiratory tract of the tool operator. Furthermore, the dust hood should prevent the emission of dust clouds during filter cleaning.

[0010] The problem is solved by the subject matter of independent claim 1. Advantageous embodiments relating to the subject matter of the independent claim are found in the dependent claims.

[0011] According to the invention, a dust hood is provided for a power tool, wherein the dust hood comprises an extraction area into which a suction hose from a vacuum cleaner opens. The dust hood is characterized in that the dust hood has a curvature in the extraction area, the curvature being designed to attenuate an impulse pulse originating from the vacuum cleaner and transmitted through the suction hose into an interior area of ​​the dust hood, and wherein the attenuation generates a counter-impulse, the counter-impulse preventing the negative pressure generated by the vacuum cleaner and transmitted through the suction hose from collapsing in the interior area of ​​the dust hood during filter cleaning.In particular, the preferably inward-curving shape of the dust hood wall ensures that the at least one cleaning impulse is deflected and prevented from penetrating from the extraction chamber into an interior space of the dust hood.

[0012] In the context of the present invention, a defined curvature in the inner wall of a dust hood is proposed, wherein the curvature is arranged particularly in the extraction area of ​​the dust hood. Advantageously, the characteristic shape of the curvature ensures that any potential impulse or pressure wave that may occur during filter cleaning of the vacuuming device, to which the proposed dust hood is preferably connected, is divided and / or deflected within the interior of the dust hood. Preferably, the dust hood, which may preferably be connected to a power tool, is connected to a vacuuming device so that the dust generated during work with the power tool can be extracted by the vacuuming device.Pressure waves and / or impulses generated during the cleaning process of the vacuum cleaner's filters can be transmitted to the dust hood via the suction hose. Dust and dust particles are preferably extracted by the vacuum cleaner creating a vacuum, which is then transmitted to the dust hood via the suction hose connecting it to the vacuum cleaner. This preferably results in a vacuum also being present inside the dust hood.

[0013] The deflection of an impulse pulse, achieved through the curvature of the dust hood, generates a counter-impulse. This advantageously prevents the negative pressure generated by the vacuum system inside the dust hood from collapsing during filter cleaning. This allows dust generated during filter cleaning while working with the power tool to be collected in the dust hood and subsequently extracted, particularly once the filter cleaning process is complete or the vacuum system's full suction power is restored. With conventional dust hoods lacking curvature in the inner wall of the extraction area, the impulse pulses occurring during filter cleaning can easily penetrate to the working part of the power tool, resulting in an undesirable release of a dust cloud.In other words, with conventional dust hoods, the impulse shocks and pressure waves generated during filter cleaning can cause a dust cloud to be expelled from the hood, potentially entering the operator's respiratory tract. This dust cloud is primarily generated by a collapse of the negative pressure within the dust hood, a phenomenon advantageously prevented in the proposed dust hood according to the invention by the defined curvature. The curvature advantageously ensures that the impulse shock is reflected at the wall where the curvature is located. In particular, the impulse shock impacting the curved wall can be conceptually decomposed into a number of essentially parallel individual shocks.Preferably, these conceptual individual impulse pulses are reflected off the curved wall of the dust hood in such a way that they are thrown back into the extraction area and at least partially cancel each other out or weaken each other. This advantageously prevents the impulse pulse from propagating into the interior of the dust hood and effectively prevents a collapse of the negative pressure there.

[0014] Surprisingly, the curvature not only attenuates or cancels out reflected pulse pulses, but also advantageously attenuates and / or cancels out newly arriving filter cleaning pulses. This can be particularly beneficial when the filter cleaning process of the dust extraction system, to which the power tool is connected, involves several pulse or compressed air pulses that successively reach the dust hood. Advantageously, the curvature of the proposed dust hood allows for the attenuation or cancellation of both already reflected and newly arriving pulse and / or compressed air pulses used to clean or blow through the filter of the dust extraction system to dislodge the filter cake. This attenuation is particularly indicated by the arrows in the lower section of the diagram. Figure 2This is further illustrated. In particular, the newly arriving impulse pulses are swirled by the reflected impulse pulses as they pass through the extraction chamber of the dust hood, effectively preventing them from penetrating further into the interior of the dust hood, which is separated from the extraction chamber by the baffle. This advantageously ensures that the negative pressure for dust extraction inside the dust hood is not impaired.

[0015] It is preferred, according to the invention, that the curvature inside the dust cover is defined by a height-to-diameter ratio. The term "diameter of the curvature," according to the invention, preferably describes the distance between two points where the curvature begins and ends on the otherwise substantially smooth wall. In other words, the two points between which the diameter is defined as a length can be understood as the starting and ending points of the curvature. The diameter of the curvature can, for example, be in a range of 15 to 35 mm. The term "height of the curvature," according to the invention, preferably describes the length by which the curvature rises on the otherwise substantially smooth wall of the dust cover. In other words, the height can be understood as the distance between the otherwise substantially smooth wall and the highest point of the curvature.The height of the curvature can, for example, be in a range of 5 to 25 mm. The height-to-diameter ratio is in a range of 0.14 to 1.7, with values ​​less than 1 being particularly preferred. In other words, it is preferred according to the invention that the diameter of the curvature is larger than its height, although in alternative embodiments the height of the curvature can also be larger than the diameter. When determining the height-to-diameter ratio, the value for the height of the curvature is preferably related to the value for the diameter of the curvature. Preferably, the values ​​can be divided by each other, with the value for the height forming the numerator of the quotient thus obtained and the value for the diameter forming the denominator of the ratio described by the quotient. One possible embodiment of the curvature is illustrated in the figures.In accordance with the invention, it is particularly preferred that the curvature faces inwards, i.e., into the extraction chamber of the dust hood. In this case, the curvature can be considered, in particular, as a dent. However, it may also be preferred that the curvature faces outwards.

[0016] The dust generated during work with the power tool can consist of dust particles of varying sizes, diameters, and geometries. For example, very small particles, barely visible to the human eye, may be part of the dust. However, it can also happen that larger particles are produced during work with the power tool, such as when processing a wall, masonry, or brickwork. These particles are initially too large to be transported through the suction hose connecting the dust hood to the vacuum cleaner and into its collection container. Therefore, such larger particles cannot initially be extracted by the vacuum cleaner.

[0017] To further process such coarse debris particles and, in particular, to extract them with the dust extraction system, the dust hood can include a baffle plate, which advantageously acts as a coarse filter. This prevents large, broken-off debris products, generated during the operation of the tool and potentially entering the interior of the dust hood, from clogging the extraction system. Instead, the baffle plate advantageously ensures that the coarse debris particles rebound off the plate and fall back into the working area of ​​the tool or into the interior of the dust hood, where they are further reduced in size by the working tool, for example, a cutting disc, until the pulverized particles can pass through openings in the hose section and be conveyed through the suction hose into the dust extraction system.

[0018] It is known that the working parts of a power tool can break under high mechanical stress. Such an unwanted breakage can pose a danger to the operator of the power tool, for example, if they are struck by splinters from the broken part. The risk of injury is caused in particular by sharp-edged, pointed, or sharp splinters, which can lead to lacerations. According to the invention, it is preferred that individual wall sections of the dust hood are double-walled, wherein the preferably double-walled sections of the dust hood wall advantageously absorb the kinetic energy of the splintered parts in the event of a breakage of a working part of the power tool, thereby providing particularly effective protection for the operator against injury or splinter impact.The working element of the tool can be formed, in particular, by a cutting or separating disc, for example, if the tool is an angle grinder or cut-off grinder. It is preferred, in accordance with the invention, that the areas of the dust hood wall which can come into contact with the resulting fragments when the cutting or separating disc shatters, are double-walled, i.e., reinforced, in order to protect the operator of the tool from injury.

[0019] It may also be preferred, in accordance with the invention, that the wall of the dust hood be continuously double-walled. A continuously double-walled design of the dust hood can be advantageous, for example, for safety reasons. It may also be preferred that the wall be at least two-walled, wherein the wall may wholly or partially have more than two layers or be formed from more than two layers or individual walls. In a two- or multi-walled design of the walls or wall sections, the areas between the individual walls may be hollow or filled with a filler material. Lightweight materials, for example, can be used as fillers to keep the weight of the dust hood low. For example, a plastic foam material can be used as filler between the individual walls of the dust hood.The individual walls of the dust hood preferably have a thickness in the range of 0.1 to 3 mm, with a wall thickness in the range of 2 to 3 mm being particularly preferred. The total wall thickness of the dust hood preferably is at least 5 mm.

[0020] Preferably, the dust hood comprises an electrically conductive base material. In other words, it is preferred that the dust hood, or its walls, be formed from an electrically conductive material. Preferably, the inside of the proposed dust hood, in particular, has the electrically conductive base material. The provision of the electrically conductive base material advantageously ensures that static charges, which can arise within the dust hood due to the often dry dust, are conducted via the dust hood to the suction hose. This ensures, as a particular advantage of the invention, the dissipation of electrostatic charges via the vacuuming device. It is especially preferred that the dust discharge is preferably designed to be completely electrostatically conductive.In particular, the dust extraction system encompasses the areas from the source of the dust to its storage in the dust container. In one embodiment of the invention, it is preferred that the dust hood comprises walls made of an electrically conductive material, wherein the material transfers static charges that may arise from the dry dust via the dust hood to the suction hose, thereby advantageously ensuring dissipation via the vacuuming device. Preferably, the entire dust extraction system, from the source to the storage of the dust in the dust container, is continuously designed to be electrostatically conductive.

[0021] For example, electrically conductive or conductive plastic can be used as the base material for the dust hood or its walls and components. It may also be preferred, in accordance with the invention, to add a conductive additive to the primary granulate used to manufacture the dust hood or its components, thereby advantageously obtaining an electrostatically conductive material. For example, metal shavings can be added as an additive to the plastic used for the production of the dust hood or its components.

[0022] Electrostatic charges within the dust hood material arise, for example, from the friction of dust particles against the plastic material of the dust hood, preferably during operation of the power tool or when dust is generated. Such charging occurs particularly when the dust is very dry, such as in summer or during prolonged dry periods. In the case of a very strong electrostatic charge, an unwanted spontaneous discharge can occur across the user if the charges are not deliberately and intentionally dissipated via appropriate grounding. For this purpose, the transitions between the individual components of the dust hood are preferably also designed to be electrically conductive to enable charge dissipation.

[0023] Preferably, the provision of an electrostatically conductive material for the dust hood or its components enables charge equalization within the tool. This is particularly advantageous when charges with opposite polarities accumulate in different areas of the tool, thus forming an electric field. The preferably electrically conductive material of the dust hood allows for charge equalization, enabling an excess of electrons in one area of ​​the tool to dissipate and a deficiency of electrons in another. By preventing uncontrolled discharge or charge equalization, sparks and thus the risk of fire during operation of the tool can be significantly reduced.

[0024] It is preferred, according to the invention, that the interior of the dust hood is designed to be fluid-dynamically homogeneous, so that aerodynamic turbulence in the interior is particularly effectively avoided. The interior of the dust hood particularly comprises the area in the preferably hollow interior of the dust hood where dust is generated by the operation of the power tool. According to the invention, this area can preferably also be referred to as the working area of ​​the power tool or the working medium. For example, the working tool can be an angle grinder or cut-off grinder, which includes a cutting or cutting disc as its working medium. According to the invention, it is particularly preferred that the interior of the dust hood comprises a working area of ​​the working medium, which, in a preferred embodiment of the invention, can be a cutting or cutting disc. Due to the fluid-dynamically homogeneous design, the dust is effectively prevented from entering the dust hood.An aerodynamically homogeneous design of the dust hood's interior can ensure particularly dust-free operation of the tool. It is especially preferred, according to the invention, that the inner walls of the dust hood, which preferably define its interior, are aerodynamically homogeneous. This aerodynamically homogeneous design can be achieved, for example, by providing particularly smooth inner walls. It is also preferred, according to the invention, that the geometry or spatial design of the dust hood's interior leads to or contributes to this aerodynamically homogeneous design.

[0025] In a preferred embodiment of the invention, the dust hood comprises a baffle wall for abrasive wear protection and / or temperature protection. It is preferred, according to the invention, that the baffle wall is arranged on a front side of the dust deflector. According to the invention, a dust deflector preferably represents a device that serves to improve the feeding or deflection of dust particles into the extraction area of ​​the dust hood. If the baffle wall comprises a metal or a metal alloy, or is formed from a metal mesh, it can also serve to protect the plastic parts of the dust hood from sparks or flying sparks. Preferably, the baffle wall is designed to be highly abrasive in order to withstand the strong mechanical and / or thermal stress caused by the dust particles and / or sparks.By providing a baffle to protect the plastic components of the dust hood, the service life of the proposed dust hood can advantageously be extended considerably. Preferably, the baffle also absorbs thermal energy, i.e., heat, and thus, due to its good thermal conductivity, ensures cooling within the dust hood. The baffle can, in particular, be formed by a baffle plate, preferably arranged on an inner side of the dust deflector. In one embodiment of the invention, it may be preferred that the baffle be formed by a grid, for example, comprising or being made of metal.

[0026] Preferably, the dust hood is formed from two corresponding halves, which together form a base body of the dust hood. The baffle is preferably attached by clamping the two dust hood halves together. It was quite surprising that the inclusion of the baffle inside the dust hood, in the area of ​​the dust deflectors, provides additional abrasive wear protection in combination with further burst protection. A further advantage of the baffle is that it enables coarse filtration of the dust, whereby large particles, which cannot initially be extracted by the suction hose of the dust extraction device, are thrown back into the interior of the dust hood so that they can be further reduced in size by the cutting disc of the tool.The crushing process yields smaller degradation particles, the size of which advantageously allows the crushed degradation particles to fit through the suction hose and be vacuumed up with the vacuuming device.

[0027] Further advantages arise from the following description of the figures. The figures, the description, and the claims contain numerous features in combination. A person skilled in the art will expediently consider the features individually and combine them into meaningful further combinations.

[0028] In the figures, identical and similar components are numbered with the same reference symbols.

[0029] They show: Fig. 1 Sectional view through a preferred embodiment of the dust hood. Fig. 2 Sectional view of a preferred embodiment of the extraction area of ​​the dust hood. Fig. 3 View of a preferred embodiment of the baffle. Fig. 4 View of a preferred embodiment of a dust hood assembly. Examples of implementation:

[0030] Figure 1 Figure 1 shows a sectional view through a preferred embodiment of the proposed dust hood (1). In particular, it shows Figure 1The bulge (5) is preferably located in a wall of the dust hood (1). It is particularly preferred, according to the invention, that the bulge (5) is located in the wall opposite the outlet of a suction hose (4). The area of ​​the dust hood (1) into which the suction hose (4) opens is preferably also referred to as the suction area (3) of the dust hood (1). The suction hose (4) preferably connects the dust hood (1) to a vacuuming device (not shown), wherein the suction hose (4) preferably transmits both the negative pressure generated by the vacuuming device for drawing in the dust and the impulse pulses generated during filter cleaning from the vacuuming device to the dust hood (1).The impulse pulses generated by the vacuuming device during filter cleaning and directed into the dust hood (1) via the suction hose (4) can, for example, form an impulse pressure jet which, in the proposed dust hood (1), initially strikes the curved area (5) of the dust hood wall. The impulse pressure jet is preferably split by the specific design of the curve (5) and deflected or redirected in different directions. In particular, the reflected impulse pulses superimpose in the curved area (5) of the dust hood (1), so that the reflected impulse pulses advantageously weaken or cancel each other out.

[0031] This attenuation or cancellation of the reflected impulse pulses provides a particular advantage of the invention: the impulse pulses do not penetrate further into the interior (6) of the dust hood (1). This advantageously allows the negative pressure to be maintained in the interior (6) of the dust hood (1) even during the cleaning of the vacuum cleaner's filter. This overcomes the disadvantage of conventional dust hoods, which often blow a cloud of dust particles out of individual openings during filter cleaning. By maintaining the negative pressure in the interior (6) of the proposed dust hood (1), such a dust cloud is advantageously avoided, thus significantly reducing the respiratory strain on the operator of the power tool (2, not shown).

[0032] While maintaining negative pressure during filter cleaning, the dust generated by the operation of the tool (2) can advantageously be collected in the interior (6) of the dust hood (1). After filter cleaning is complete, the vacuuming device can again generate negative pressure, which can be transferred to the dust hood (1) via the suction hose (4). This allows the dust particles collected in the dust hood (1) during filter cleaning to be extracted through the suction hose (4) and stored in a collection container of the vacuuming device.

[0033] Furthermore, it shows Figure 1Individual sections of the walls (7) of the dust hood (1) are at least partially double-walled. This makes the wall sections (7) of the dust hood (1) more stable and provides the operator of the tool (2) with improved protection, for example, if a component of the tool (2) is damaged or breaks. Any splinters resulting from such damage can be caught by the preferably double-walled sections of the dust hood wall (7), thus advantageously preventing the splinters from escaping the dust hood (1). Furthermore, the outer walls of the at least partially double-walled dust hood walls (7) can have elastic properties, enabling the double-walled sections (7) to absorb deformation forces, for example, in the event of a fall of the dust hood (1) or the tool (2).As a result, the double-walled wall areas (7) also advantageously ensure improved fall protection for the proposed dust hood (1) or tool device (2).

[0034] It is preferred according to the invention that the device chain of the inner dust area is designed to be electrostatically conductive. This advantageously dissipates any electrostatic charges that occur to the suction hose (4) and then to the vacuuming device, where they can subsequently be safely discharged into the ground via the earth conductor. Advantageously, this method enables the dissipation of charges in both mains-powered and battery-operated power tools (2).

[0035] In the Figure 1 In the preferred embodiment of the invention shown, a baffle wall (8) is also depicted. The baffle wall (8) in the Figure 1In the illustrated embodiment, the baffle is designed as a metal mesh. The metal mesh (8) prevents larger dust or stone particles, which, according to the invention, are preferably also referred to as degradation particles, from entering the extraction area (3) of the dust hood (1). In other words, the baffle (8) marks a boundary between the interior (6) of the dust hood (1), located in the lower region of the dust hood (1), and an extraction area (3) of the dust hood (1), located in the upper region of the dust hood (1). The baffle (8) preferably ensures that the larger dust or stone particles are thrown back into the interior (6) of the dust hood (1), where they can be further crushed if they enter the working area of ​​the tool (2).If, after reprocessing by the tool (2), the dust or stone particles have a diameter that fits through the openings of the baffle (8), the particles can enter the extraction area (3) of the dust hood (1) and be extracted by the vacuum system. For this purpose, the particles are first sucked into the suction hose (4) and then into the collection container of the vacuum system.

[0036] Figure 2Figure 1 shows a sectional view of a preferred embodiment of the extraction area (3) of the dust hood (1). This is preferably the upper area of ​​the dust hood (1) into which the suction hose (4) of the vacuuming device opens. Preferably opposite this opening of the suction hose (4) into the dust hood (1), the bulge (5) is arranged, which advantageously causes a division and / or deflection of the impulse pulses from the vacuuming device. It is preferred, according to the invention, that the bulge (5) causes a refraction of the impulse pressure pulse, so that the impulse pressure pulse is weakened to such an extent that it can no longer enter the interior (6) of the dust hood (1). The bulge (5) in the Figure 2In the illustrated embodiment of the invention, a dent is formed, i.e., a concave indentation in the area of ​​the wall of the dust hood (1) opposite the inlet of the suction hose (4). In particular, a dent within the meaning of the invention preferably represents an indentation, i.e., an area in which there is a bulge inwards towards the interior of the dust hood (1). The impulse pulses emitted by the vacuuming device during filter cleaning preferably travel in a straight line as they exit the suction hose (4) and thus strike the dust hood wall at a specific angle determined by the shape of the curved wall area. Within the meaning of the invention, the term "curved wall area" preferably refers to the wall area of ​​the dust hood (1) that includes the bulge (5) of the dust hood wall.

[0037] The impulse pulses are reflected from the wall of the dust hood (1) according to the angle of impact and thrown into the extraction area (3) of the dust hood (1). The wall area of ​​the dust hood (1) opposite the inlet of the suction hose (4), which preferably also includes the curve (5), is designed such that the reflected impulse pulses cancel each other out or at least weaken considerably due to superposition effects. As a result, the pulses can no longer penetrate further into the interior (6) of the dust hood (1). Surprisingly, this effectively prevents a collapse of the negative pressure in the interior (6) of the dust hood (1), so that, in particular, no dust clouds are blown out of the interior of the proposed dust hood (1) into the surrounding area of ​​the tool (2) during filter cleaning.The curvature (5) within the dust hood wall causes the reflected impulse pulses to practically fan out and be scattered in different directions. Due to the limited space available in the extraction area (3) of the dust hood (1), the reflected impulse pulses advantageously superimpose in such a way that they are significantly weakened or completely canceled out. Thus, the impulse pulses, which initially strike the dust hood wall essentially parallel to each other, are reflected throughout the entire extraction area (3) of the dust hood (1), where they weaken each other. This reflection or refraction of the impulse pulses is particularly pronounced in the lower part of . Figure 2The black arrows preferably represent a conceptually decomposed impulse pulse into individual pulses. These individual pulses, generated by the vacuuming device during filter cleaning, are refracted or reflected at the curved dust hood wall and deflected into the extraction area (3) of the dust hood (1). The reflected or refracted conceptual individual pulses are Figure 2 , below, preferably shown with white arrows.

[0038] Figure 3 shows a view of a preferred embodiment of a dust hood assembly. Illustrated in Figure 3 is in particular a preferred embodiment of a proposed dust hood (1). Figure 3Figure 1 shows in particular the upper part of the dust hood (1), which is formed by an extraction area (3). A suction hose (4) opens into this extraction area (3), connecting the dust hood (1) to a vacuuming device. The interior (6) of the dust hood (1) is located in a lower part of the dust hood (1), which is equipped with a baffle (8, see Figure 1). Fig. 4 ) is separated from the extraction area (3).

[0039] Figure 4Figure 1 shows a view of a preferred embodiment of the baffle (8) of the proposed dust hood (1). Above the baffle (8), which in the illustrated embodiment of the invention is designed as a metal grid, is the intake area (3) of the dust hood (1) with a bulge (5). The bulge (5), or the curved wall area of ​​the dust hood (1), is preferably arranged opposite the inlet of the suction hose (4), with which the dust hood (1) can be connected to a vacuuming device. Below the metal grid (8) is the interior area (6) of the dust hood (1), in which, for example, the working element of the tool (2) can be located.

[0040] It is preferred according to the invention that the dust hood (1) comprises two shells or halves that form a base body of the dust hood (1). The two shells hold and clamp the metal mesh (8). This prevents large chipped or broken-off pieces or particles from clogging the suction hose (4). This allows for safe operation of the tool (2) or the dust extraction device without interruptions due to blocked hoses. Furthermore, the inclusion of a baffle (8) reduces the formation of a dust cloud, which can occur as a detrimental consequence of a blocked extraction line. Reference symbol list

[0041] 1 Dust hood 2 Tool 3 Extraction area 4 Suction hose 5 Curvature 6 Interior of the dust hood 7 Double-walled wall of the dust hood 8 Baffle plate

Claims

1. Dust hood (1) for a power tool (2), wherein the dust hood comprises an extraction region (3) in which a suction hose (4) coming from a dust-sucking device opens into the dust hood (1), wherein the dust hood (1) has a curvature (5) in the extraction region (3), characterized in that the curvature (5) is designed to attenuate an impulse surge coming from the dust-sucking device and conveyed through the suction hose (4) into an inner region (6) of the dust hood (1), wherein the attenuation produces a counter-impulse, wherein the counter-impulse prevents a situation in which, in the inner region (6) of the dust hood (1), the vacuum generated by the dusk-sucking device and conveyed by the suction hose (4) at the time of a filter cleaning, wherein the curvature (5) is defined by a ratio of height to diameter and the ratio lies in a range from 0.14 to 1.7.

2. Dust hood (1) according to Claim 1, characterized in that individual wall regions (7) of the dust hood (1) are of double-walled design.

3. Dust hood (1) according to either of the preceding claims, characterized in that the dust hood (1) comprises an electrically conductive base material.

4. Dust hood (1) according to one of the preceding claims, characterized in that the inner region (6) of the dust hood (1) is designed to be homogeneous in terms of flow dynamics, with the result that aerodynamic turbulence in the interior (6) is particularly effectively avoided.

5. Dust hood (1) according to one of the preceding claims, characterized in that the dust hood (1) comprises a baffle (8) as abrasive wear protection and temperature protection.

6. Dust hood (1) according to Claim 5, characterized in that the baffle (8) separates the extraction region (3) from the inner region (6) of the dust hood (1).