Filtering member for a hand-held work implement

Abstract

The invention relates to a hand-held work implement having a filter member (1) for filtering cooling air. The filter member (1) is arranged to form part of the outer side (3) of the work implement (2). The filter member (1) has a coarse thread element (4) and a fine thread element (5). Not only the fine thread element (5) but also the coarse thread element (4) can be passed through by cooling air to filter the cooling air. The coarse thread element (4) and the fine thread element (5) are each thread-shaped. The diameter (d1) of the coarse thread element (4) is greater than the diameter (d2) of the fine thread element (5). The coarse thread element (4) serves to support the fine thread element (5).

Description

Technical Field

[0001] This invention relates to a filter element for filtering cooling air for use in handheld work tools. Background Technology

[0002] Such externally located filter components are known from EP 3 798 433 A1. Summary of the Invention

[0003] The objective of this invention is to improve this type of filter element so that it simultaneously possesses good filtration performance and high mechanical load-bearing capacity relative to forces acting on the filter element from the outside.

[0004] The task is solved by a filter element for filtering cooling air for a handheld work tool, wherein the filter element is configured to form part of the outer side of the work tool, wherein the filter element has a coarse yarn element and a fine yarn element, wherein the fine yarn element and the coarse yarn element can be passed through to filter the cooling air, wherein the coarse yarn element and the fine yarn element are respectively yarn-shaped, wherein the diameter of the coarse yarn element is larger than the diameter of the fine yarn element, and wherein the coarse yarn element serves to support the fine yarn element.

[0005] Another objective of the present invention is to improve this type of handheld work tool with a filter element in such a way that good filtration effect and high mechanical load capacity relative to the force acting on the filter element from the outside are achieved simultaneously.

[0006] This task is solved by a handheld working device with a filtering component, wherein the filtering component is configured to form part of the outer side of the working device, wherein the filtering component has a roving element and a fine yarn element, wherein cooling air can pass through the fine yarn element and the roving element to filter the cooling air, wherein the roving element and the fine yarn element are respectively yarn-shaped, wherein the diameter of the roving element is larger than the diameter of the fine yarn element, wherein the roving element serves to support the fine yarn element, wherein the filtering component forms part of the outer side of the working device, and wherein, through the filtering component, cooling air can flow from the outside to the inner region of the working device in the flow direction.

[0007] This invention is based on the understanding that good filtration effect is achieved through a fine filtration structure composed of finer structural elements with lower strength, and high mechanical load-bearing capacity is achieved through a coarser filtration structure with higher strength structural elements. Both advantages can be obtained simultaneously by the fact that the filter element according to the invention comprises coarse yarn elements and fine yarn elements. Cooling air can pass through both the fine yarn elements and the coarse yarn elements to filter the cooling air. Both the coarse yarn elements and the fine yarn elements are yarn-shaped. The diameter of the coarse yarn elements is larger than the diameter of the fine yarn elements. The coarse yarn elements serve to support the fine yarn elements.

[0008] Excellent filtration can be achieved using fine yarn elements. Due to the fine yarn elements, the mesh width of the filter element can be small. At the same time, the coarse yarn elements support the fine yarn elements, thus ensuring the filter element's high mechanical load-bearing capacity.

[0009] Yarn elements are particularly elongated, yarn-shaped structural elements. Specifically, the yarn elements extend along the longitudinal direction. This longitudinal direction does not necessarily have to be straight; it can also follow a curved shape. The cross-section passing through the yarn element in a direction perpendicular to the longitudinal direction has a diameter corresponding to the maximum elongation of the cross-section. In particular, the cross-section is essentially circular.

[0010] In particular, it can be configured such that the roving elements themselves interweave, especially knit, into a support fabric, and the fine yarn elements themselves interweave, especially knit, into a filter fabric. In this case, the filter member comprises two layers. The roving elements form the first layer, namely the support fabric, and the fine yarn elements form the second layer, namely the filter fabric. In particular, the support fabric is a fabric. The fabric is produced by interweaving two interlaced yarn systems: warp and weft yarns. However, it can also be configured such that the support fabric is knitted. The knitted fabric is made on a knitting machine by looping. Here, the loops are interlocked to create a surface. In particular, the filter fabric is a fabric. However, it can also be configured such that the filter fabric is knitted. In particular, the roving elements themselves form a fabric, especially a knitted fabric. In particular, the fine yarn elements themselves form a fabric, especially a knitted fabric. Alternatively, it can be configured such that the roving elements and the fine yarn elements interweave together, especially knit, into a single support filter fabric. In particular, the support filter fabric is a fabric. However, it can also be configured such that the support filter fabric is knitted. In particular, the supporting filter fabric comprises a single layer formed collectively by roving elements and fine yarn elements. Thus, the supporting effect of the fine yarn elements at the roving elements can be achieved particularly reliably. The filter fabric has a relatively small height. Specifically, the roving and fine yarn elements together form a knitted fabric.

[0011] In particular, the filter fabric is directly supported on the support fabric during the operation of the filter element. In particular, the filter fabric and the support fabric are in direct contact with each other. In particular, the filter fabric contacts the support fabric during operation. The filter element is in operation when airflow passes over the filter fabric and the support fabric, or passes over the support filter fabric. The filter element is in particular in operation when it is traversed by cooling air in the flow direction. The filter element is in particular in operation when cooling air is drawn through the filter element in the flow direction.

[0012] In particular, roving elements have greater stiffness than fine yarn elements. Specifically, roving elements are more rigid and less prone to deformation relative to the forces acting upon them than fine yarn elements.

[0013] In particular, the support fabric is arranged in such a way that it forms part of the outer side of the working device. Thus, the support fabric can absorb forces acting on the filter element from the outside and protect the filter fabric from deformation or damage. Specifically, the filter fabric faces the inner area of ​​the working device.

[0014] In particular, in an alternative embodiment, the filter fabric is arranged in the working device such that it forms part of the outer side of the working device. Specifically, the filter fabric is arranged in the working device such that it forms part of the outer side. Specifically, the support fabric faces the inner area of ​​the working device. Arranging the filter fabric in such a way that it forms part of the outer side of the working device has the advantage that the outer side is also smoother than when arranged in the opposite direction, due to the filter fabric being particularly smoother than the support fabric. Dirt and filtered particles then penetrate the support fabric to a reduced degree and cannot adhere to it to the same extent. Through vibration and impact during the operation of the working device, dirt and particles can be partially or completely loosened and fallen off the filter fabric again. This also facilitates cleaning of the filter element from the outside, for example, using a broom.

[0015] In a particular improvement of the invention, the filter element includes an additional support fabric. Specifically, the additional support fabric is woven from additional roving elements. Specifically, the additional roving elements of the additional support fabric themselves form a knitted fabric. Specifically, the additional support fabric is constructed independently of the support fabric. Specifically, the filter fabric is arranged between the support fabric and the additional support fabric. Thus, the filter fabric is reliably protected from deformation and damage. Specifically, the filter element comprises three layers.

[0016] In particular, the roving elements and the fine yarn elements are interwoven using a plain weave. In a plain weave, each warp yarn alternately lies above and below the weft yarn, and each weft yarn alternately lies above and below the warp yarn. Specifically, the roving elements supporting the fabric are interwoven in a plain weave. Specifically, the fine yarn elements of the filter fabric are interwoven in a plain weave. It can also be configured such that the roving elements supporting the filter fabric and the fine yarn elements are interwoven in a plain weave. Specifically, the roving elements are the warp yarns supporting the filter fabric, and the fine yarn elements are the weft yarns supporting the filter fabric. This allows for a small mesh width, especially in the direction of the fine yarn element extension. This produces a good filtration effect. Plain weave is also called a smooth weave. Plain weave is also called a linen weave.

[0017] In particular, the roving elements supporting the fabric are interwoven with each other using a twill weave. Similarly, the fine yarn elements supporting the filter fabric are interwoven with each other using a twill weave. It can also be configured such that the roving and fine yarn elements supporting the filter fabric are interwoven with each other in a twill weave. The characteristic feature of a twill weave is a distinctive diagonal pattern created by a specific arrangement of warp and weft yarns. In a twill weave, the weft yarn is guided over a warp yarn, then passes under at least two warp yarns, then over another warp yarn, and so on. This rhythm continues by shifting one warp yarn in the next row. The shift always occurs in the same direction. This results in a surface structure with diagonal grooves, called ribs.

[0018] In particular, the roving and fine yarn elements supporting the filter fabric are interwoven into a satin weave. In particular, the roving elements extend linearly, especially in a single direction, along their entire longitudinal extension. In particular, the roving elements do not bend due to the fine yarn elements in the areas where they intersect.

[0019] The satin fabric can be configured as a "smooth satin." In a so-called smooth satin, the weft yarns are tightly struck against the fabric in a plain weave as they interweave. The warp yarns are spaced further apart and are thicker than the weft yarns. Due to the strong impact during interweaving, the weft yarns deform slightly at their intersections, causing these contact points to flatten slightly.

[0020] Due to the coarse yarn elements in satin fabrics, they possess very high mechanical stability and load-bearing capacity, while also exhibiting excellent filtration performance.

[0021] The filtration properties of a smooth satin weave can be altered by changing the yarn strength and spacing of the warp yarns.

[0022] Alternatively, the satin fabric can be configured as an "armored satin." In this weave, the warp yarns are fine and tightly arranged side-by-side. The coarser weft yarns are tightly interlaced. Therefore, the openings extend obliquely towards the fabric surface. By designing it as an armored satin, the support filter fabric is mechanically very stable and tear-resistant. When designed as an armored satin, the warp yarns are particularly fine yarn elements, and the weft yarns are particularly coarse yarn elements.

[0023] In particular, the support mesh width of the support fabric is larger than the filter mesh width of the filter fabric. This allows for good filtration performance with the help of the filter fabric. At the same time, the filter fabric is protected from deformation and / or damage by the support fabric. The support fabric can filter, especially pre-filter, coarse particles, while the filter fabric can filter fine particles with a diameter smaller than the coarse particles.

[0024] The filter element, in particular, has a frame. This frame restricts the structural units composed of filter fabric and support fabric from both sides with respect to the flow direction of cooling air. Thus, the structural units composed of filter fabric and support fabric are held together by the frame. Specifically, the frame is injection molded around the filter fabric and support fabric. Obviously, this only applies to certain areas of the filter fabric and support fabric. In designs where the filter element has a support filter fabric, it can also be configured such that the support filter fabric is wrapped by the frame. This frame restricts the support filter fabric from both sides with respect to the flow direction of cooling air. Specifically, the frame is injection molded around the support filter fabric.

[0025] In particular, the roving elements and / or the fine yarn elements are made of metal, especially stainless steel, and especially high-quality steel. This results in high mechanical stability of the filter fabric and / or support fabric, or the support fabric for the filter fabric.

[0026] However, it is also possible to configure the roving elements and / or the fine yarn elements to be made of plastic. This applies to both designs where the filter element has a support fabric and a filter fabric, and designs where the filter fabric is supported. This allows for the simple and cost-effective manufacture of the filter element.

[0027] Alternatively, the roving elements can be made of metal, especially stainless steel, and particularly high-quality steel, while the fine yarn elements are made of plastic, or vice versa. This applies to both designs where the filter element has a support fabric and a filter fabric, and designs where the filter element has a support fabric. This allows for the stable, simple, and cost-effective manufacture of filter elements.

[0028] In particular, the filter element has at least two connecting ribs. The connecting ribs are arranged on the fine yarn element and / or the roving element. In particular, the connecting ribs are arranged on the outside of the working device. In particular, the at least two connecting ribs reinforce the frame. In particular, the at least two connecting ribs respectively connect two opposite portions of the circumferential frame of the frame to each other.

[0029] The filter element has a maximum extension measured perpendicular to the flow direction. At least two connecting ribs extend in an area exceeding at least 30% of the maximum extension, particularly extending without crossing and substantially parallel to each other. This facilitates cleaning the filter element. In particular, in this area, the space between the at least two connecting ribs is free of transverse ribs extending beyond the at least two connecting ribs. In the direction of extension of the at least two connecting ribs, the filter element can thus be swept across this area without interference from transverse ribs using a broom.

[0030] In particular, at least two connecting ribs surround at least a portion of the roving element and at least a portion of the yarn element from both sides with respect to the airflow direction of the cooling air. Thus, the yarn element and the roving element, especially the support fabric and the filter fabric, are reliably connected to each other.

[0031] In a handheld work appliance according to the invention, having a filter member according to one of the above-described variations, the filter member can be configured to form part of the outer side of the work appliance. In particular, through the filter member, cooling air can flow from the outside into the internal region of the work appliance in the flow direction. This allows the cooling air to be filtered. Simultaneously, the filter member is mechanically stable.

[0032] In particular, the working tool includes a tool with a longitudinal central axis. Specifically, when viewed in a view along the flow direction of the cooling air, the longitudinal central axis of the tool is arranged between at least two connecting ribs. Thus, the filtering member, and especially the at least two connecting ribs, can serve as a directional aid for using the tool. For example, when the tool is obscured by a workpiece, the at least two connecting ribs, or their orientation, provide information about the position of the longitudinal axis of the tool's guideways.

[0033] In a particular improvement of the invention, the filter element can be secured to the base of the workpiece by a single, especially central, fastening element. This allows for simple and quick securing of the filter element. Similarly, it enables quick replacement and / or easy cleaning of the filter element.

[0034] The present invention also relates to a filter element for filtering cooling air for use in a handheld work tool, wherein the filter element includes a frame and a fabric, wherein the filter element is configured to be circulated by cooling air in the flow direction, wherein the frame wraps around the fabric from both sides about the flow direction and closes around the flow direction, wherein the fabric has a channel opening that completely penetrates the fabric in the flow direction for inserting a pin during the manufacture of the filter element, wherein the filter element includes a stop member, and wherein the stop member prevents the filter element from being circulated by cooling air in the region of the channel opening in the flow direction.

[0035] In the flow direction, the area of ​​the channel opening used to guide the pins during filter component manufacturing is blocked by the flow of cooling air through this barrier. This prevents holes from being left in the fabric due to the channel opening used to guide the pins during filter component manufacturing, which would negatively affect the filtration effect. As a result, the filter component achieves a good filtration effect.

[0036] In particular, the channel opening, and especially its edges, are surrounded by the frame material. A support structure is created simply using this frame material located at the edge of the channel opening, where a barrier can be placed. The barrier can be supported by this frame material located at the edge of the channel opening.

[0037] In particular, the frame includes a circumferential frame and at least one connecting structure. The circumferential frame surrounds the edge of the fabric, particularly in a closed manner. The connecting structure connects two opposing portions of the circumferential frame to each other. Thus, the filter element, particularly the frame, is more stable and, in particular, more rigid. The channel opening is particularly arranged in the area of ​​the connecting structure, particularly at a distance from the circumferential frame. Therefore, during the casting process steps for manufacturing the frame, the fabric can be positioned near or even at the fabric's center of gravity by pins. This achieves reliable positioning of the fabric with as few pins as possible, particularly using only a single pin. It can also be configured that the fabric is held by two or more pins during the casting process steps. In particular, this is done by means of additional pins in a manner similar to that described for at least one pin.

[0038] In particular, the channel opening is covered by a connecting structure. Furthermore, the barrier is formed by the connecting structure. Therefore, the barrier can be manufactured in a simple manner during frame manufacturing, especially during the casting process steps. Consequently, the frame material can be used to manufacture the barrier. This results in material and cost savings.

[0039] In particular, the blocking element is a covering section that covers, in particular, completely covers the channel opening. In particular, the covering section is arranged above the channel opening. In particular, in a view along the flow direction, the covering section covers, in particular, completely covers, the channel opening. In particular, the covering section is part of the connecting structure, in particular the frame.

[0040] The frame has a thickness measured in the flow direction in the area surrounding the channel opening. The cover section has a cover thickness measured in the flow direction.

[0041] In particular, the cover thickness is at most 50%, especially at most 20%, and especially at most 5% of the frame thickness. As a result, the blocking components, especially the cover section, can be manufactured with material savings.

[0042] In particular, the cover thickness is at least 1% of the frame thickness. Thus, the barrier, especially the cover section, is thick enough to prevent cooling air from flowing through the channel opening.

[0043] In particular, the coverage thickness is 0.01mm to 5mm, especially 0.05mm to 2mm.

[0044] In particular, the barrier is formed from the frame material.

[0045] In particular, the barrier cover-shaped portion of the channel opening. This allows for both material savings and stable manufacturing of the barrier. Furthermore, the barrier can thus be manufactured in a simple manner during the casting process steps.

[0046] The present invention also relates to a method for manufacturing a filter element for filtering cooling air for use in a handheld work tool. The filter element is configured to include a frame and a fabric, wherein the filter element is configured to be circulated by cooling air in a flow direction, wherein the frame encloses the fabric, and during the manufacture of the filter element, the fabric is cast in a casting process step between a first tool half and a second tool half such that the frame is formed therein, wherein the fabric has a channel opening through which at least one pin is guided during the casting process step to hold the fabric in place, and the flow of cooling air through the filter element in the region of the channel opening in the flow direction is prevented by a blocking element, and in particular, the blocking element is formed by the frame.

[0047] This method allows for the simple manufacture of filter components with good filtration performance.

[0048] In particular, the blocking element is formed during the casting process step. Specifically, during the casting process step, the material used to manufacture the frame penetrates into the area between the pin and the casting tool. It can be configured such that a space always exists between the pin and the casting tool into which material can penetrate during the casting process step. Alternatively, it can be configured such that the pin abuts against the second tooling half of the casting tool at the beginning of the casting process step, and a space is created between the pin and the second tooling half during the casting process step.

[0049] In particular, the pin is pre-tightened towards the second tool half, especially by means of a spring. The pre-tightening tension and the pressure of the material introduced during the casting process are coordinated such that the pin is removed from the second tool half through the material against the direction of the tension during the casting process. Here, a space is created between the second tool half and the pin, into which the material permeates. Here, a blocking element, especially a covering section, is constructed. The opening of the fabric channel is hereby not completely filled with material.

[0050] An alternative to the blocking element constructed through the covering section can be configured such that the blocking element is constructed of a sealing element. In particular, the channel opening is sealed by the blocking element, especially the sealing element. In particular, the sealing element is a plug in the channel opening. In particular, the sealing element is made of an elastomer, especially a thermoplastic elastomer.

[0051] In particular, in the relevant method, during the casting process step, at the location of the pin, a retaining opening is formed in the frame that completely penetrates the frame in a direction from the first tool half to the second tool half of the casting tool. In particular, the frame and the retaining opening are formed simultaneously around the retaining opening. In particular, during the casting process step, the pin holding the fabric in place penetrates the fabric at a location where it is injected and covered, such that a frame is formed at and / or around that location. In particular, the retaining opening is closed using a sealing element in a subsequent sealing process step.

[0052] This avoids leaving holes in the fabric caused by pins in the finished filter element. Instead, the hole is created as a channel opening in the area of ​​the frame and is subsequently closed, or in particular, completely filled, by a sealing element. Thus, neither visual nor functional defects are created, and the filter element, and especially the fabric, is positioned during the casting process steps.

[0053] In particular, during the casting process step, the pin is guided through the channel opening. In particular, during the casting process step, the fabric is securely threaded onto the pin through the channel opening. This ensures that the fabric is securely positioned between the two tool halves. In particular, during the casting process step, the pin contacts both the first and second tool halves. Thus, the fabric is securely threaded onto the pin. However, it can also be configured such that the pin only protrudes into the other tool half, preventing the fabric threaded onto the pin from detaching from it.

[0054] In particular, the fabric is rigid in bending. This allows the fabric to be threaded onto the pin and reliably positioned between the two tool halves.

[0055] In particular, the frame is manufactured during the casting process using injection molding, especially plastic injection molding. This allows for the simple manufacture of the frame and filter components.

[0056] In particular, the sealing element is cast while the filter member is located between the first tool half and the second tool half. Specifically, the filter member is continuously positioned between the first tool half and the second tool half between the casting step and the sealing step. This allows for the cost-effective and rapid manufacture of the filter member.

[0057] In particular, the filter component has a sealing element for abutting against the base of the handheld workpiece and for sealing between the frame and the base. In a particular improvement of the invention, the sealing element is manufactured during the sealing method step. This allows both the sealing element and the sealing component to be manufactured in the same method step (i.e., during the sealing method step). This saves time and cost.

[0058] In particular, the sealing element and the closure element are cast in a single casting step. In particular, the sealing element and the closure element are constructed from the same material, especially as a single unit.

[0059] In particular, during the injection of material used to manufacture the sealing element, an opening is maintained to allow air displaced by the material to escape. This allows for the rapid and simple manufacture of the sealing element. Because air displaced by the material of the sealing element can escape easily and quickly by maintaining the opening for venting, the sealing element can thus be manufactured with a uniform consistency, and especially without air bubbles.

[0060] In particular, the frame has a channel for receiving a sealing element. This channel extends, especially at the edge of the frame. The retaining opening is arranged, especially at a distance from the edge of the frame. In particular, the channel and the retaining opening are interconnected via a connecting channel in the frame. In this way, the sealing element can be manufactured in the channel at the edge of the frame during the sealing process step. Simultaneously, the material used to manufacture the sealing element can further flow into the connecting channel and then into the retaining opening. Here, a closing element can be manufactured in the retaining opening. By designing the frame with a channel and a connecting channel to the retaining opening, the sealing element and the closing element can be manufactured in a simple manner in a single sealing process step.

[0061] In particular, the frame has a gating opening for injecting material used to manufacture the sealing element. Through the gating opening, the material used to manufacture the sealing element reaches the channel during the sealing method steps. Specifically, the material used to manufacture the sealing element moves from the channel into the connecting channel and then to the retaining opening during the sealing method steps. The material used to manufacture the sealing element is also used in this manner to manufacture the closure element.

[0062] In particular, the fabric is threaded onto the pin with its channel openings before the casting process steps, and then placed on the support surface of the support element. Specifically, the support surface is initially arranged at a distance from the first tool half. Due to the distance between the support surface and the first tool half, the fabric can be grasped without problems at the edges during positioning and threading onto the pin. This can also be achieved, in particular, by means of a robot, especially a robotic arm.

[0063] In particular, after the fabric is threaded onto the pin, the fabric is pressed against the support surface by a retaining element protruding from the second tool half. Thus, the fabric is temporarily fixed in its position, at least during subsequent fabric movement.

[0064] In particular, after the fabric is threaded onto the pin, the fabric moves together with the support element and the second tool half toward the first tool half, so that the fabric rests against both the first and second tool halves. Specifically, the gap between the support element and the first tool half is smaller at this point than before. Furthermore, there is no longer a gap between the support surface and the first tool half. This allows the fabric to be brought to its proper position during the casting process steps for manufacturing the frame in a simple manner.

[0065] In particular, the first tool half and the second tool half are formed during the casting process steps for manufacturing the mold, especially the casting tool, for the frame.

[0066] In particular, the filter element is configured to form part of the outer side of the working tool.

[0067] The present invention also relates to a handheld working device comprising a base and a filter element for filtering cooling air, wherein the filter element is fastened to the base by means of a fastening element about a fastening direction, wherein the filter element has a frame, wherein the filter element has a sealing element surrounding in a circumferential direction for sealing between the frame and the base, wherein the sealing element is arranged between the frame and the base in the fastening direction, wherein the working device includes at least one stop element between the base and the frame, wherein during fastening the filter element to the base, proximity of the frame and the base in the fastening direction is limited by the stop element.

[0068] This invention is based on the understanding that when fastening this type of filter element with fastening elements, especially in filter elements with a large filtration area, undesirable fit inaccuracies may occur, leading to unreliable sealing between the substrate and the filter element by means of sealing elements. Although such great pressure can be applied to the filter element against the substrate by means of fastening elements, causing the filter element to press the sealing element against the substrate with its frame, undesirable strong deformation or compression of the sealing element may occur. The consequence is premature and rapid wear of the sealing element and possible leakage at the locations of excessive compression of the sealing element.

[0069] According to the invention, the stop element should locally prevent undesirable, especially elastic, deformation, and especially compression, of the sealing element. For this purpose, the working device has at least one stop element between the base and the frame. During the fastening of the filter member to the base, the approach of the frame and the base in the fastening direction is limited by the stop element. In particular, the stop element locally, especially locally restricted, spans the gap between the base and the frame. In particular, the stop element partially restricted about the circumferential direction of the sealing element spans the gap between the base and the frame. Thus, the frame of the filter member can be pressed with sufficient force towards the base of the handheld working device by means of the fastening element at a location away from the stop element, such that the sealing element is at least in a desired form abutting against both the frame and the base. At the location of the stop element, by the stop element abutting against both the base and the frame, undesirable large approaches between the frame and the base are prevented. This prevents undesirable large, especially elastic, deformation, and especially compression, of the sealing element. This allows the sealing element to be fitted against both the substrate and the frame in a desired form along its circumferential direction in a simple manner. In this simple way, the filter element can be fastened to the substrate by means of fastening elements, while simultaneously achieving a good sealing effect from the sealing element. In particular, the sealing element is closedly wrapped along the circumferential direction. In particular, the sealing element is closedly wrapped around the fastening direction.

[0070] In particular, the filter element forms part of the outer side of the working device. In particular, the filter element is fastened to the base.

[0071] In particular, at least one stop element restricts the sealing element's compression, especially elastic compression, and especially deformation, in the tightening direction.

[0072] In particular, the frame and substrate are rigider than the sealing element. In particular, the sealing element is elastic. In particular, the sealing element is a thermoplastic elastomer.

[0073] In particular, the stop element extends only in a partial area of ​​the complete circumference of the sealing element. This partial area corresponds specifically to an angle range of <20°. In particular, this angle range is >0.5°. In particular, the stop element spans the gap between the frame and the base such that a first gap, measured in the fastening direction, is constructed between the frame and the base in the circumferential direction, specifically directly before the stop element, and a second gap, measured in the fastening direction, is constructed in the circumferential direction, specifically directly after the base.

[0074] In particular, the filter element comprises a fabric. This fabric is specifically wrapped by a frame. In particular, the fabric is at least partially made of metal. In particular, the frame is made of plastic. In this combination of materials, the precision with which the filter element fits the substrate makes it particularly difficult to achieve the desired contact of the sealing element everywhere. Due to the different materials of the filter element, warping of the element can occur, especially under temperature fluctuations.

[0075] In particular, only a single fastening element is used to secure the filter element to the base. When using only a single fastening element, especially a single screw, the precision of the fit between the filter element and the base of the handheld tool is especially important. In this case, it is impossible to compensate for the warping of the filter element with a second fastening element. However, due to the single fastening element, a particularly comfortable fastening of the filter element at the base can be achieved. Specifically, the fastening element, especially the single fastening element, is arranged spaced apart from the edge of the frame. Thus, the fastening element can be positioned near or even at the center of gravity of the filter element. This allows for a good and simple fastening of the filter element at the base.

[0076] In particular, the sealing element, in its fully compressed state at the compression portion between the frame and the substrate, has a compression height measured in the fastening direction. In particular, the sealing element, in its uncompressed state, has a sealing element height measured in the same direction at the same compression portion. Optionally, at least one stop element restricts the compression of the sealing element at the compression portion in the fastening direction such that the compression height is at least 50%, particularly at least 70%, particularly at least 80%, particularly at least 90%, particularly at least 95% of the sealing element height. This avoids undesirably strong compression of the sealing element. This ensures that the sealing element reliably seals the space between the substrate and the frame of the filter member. The service life of the sealing element is not limited by undesirably excessive compression of the sealing element.

[0077] In particular, the frame has frame edges that are particularly closed and surround in the circumferential direction, and / or the base has a base surface that is particularly closed and surround in the circumferential direction. In particular, the frame edges are the upper surfaces of the frame facing the base. In particular, the frame edges are adjacent to, and particularly directly adjacent to, the sealing element. In particular, at least one stop element protrudes beyond the frame edges and / or beyond the base surface in the fastening direction. In particular, at least one stop element is fixed to the frame of the filter member or to the base of the handheld work appliance. In particular, at least one stop element is constructed uniformly with, and particularly integrally with, the frame or base material. Thus, at least one stop element can be manufactured in a simple manner. Thus, at least one stop element can be positioned in a simple manner during the manufacture of the handheld work appliance. The stop element is thus reliably held in the desired location.

[0078] In particular, the possible distance between the sealing element and at least one stop element, measured in a direction perpendicular to the fastening direction, is less than five times, especially three times, especially one time, the height of the sealing element. Thus, the stop element functions near the sealing element. This ensures, in a simple way, that the sealing element is not excessively compressed. Alternatively, it can be configured such that there is no distance at all between the sealing element and at least one stop element.

[0079] In a particular improvement of the invention, at least two, and in particular multiple, stop elements are provided, which are spaced apart from each other in the circumferential direction. This allows for the prevention of excessive compression of the sealing element at multiple locations along the circumferential direction by means of at least two, and in particular multiple, stop elements.

[0080] The present invention also relates to a filter element for filtering cooling air for use in a handheld work tool, wherein the filter element is configured to form part of the outer side of the work tool and is mounted on the base of the work tool, wherein the filter element includes a peilelement for orienting the work tool, particularly for orienting the tool of the work tool, wherein the filter element has a sealing element for abutting against the base of the handheld work tool and for sealing between the filter element and the base, and wherein the peilelement and the sealing element are constructed of the same material.

[0081] According to this aspect of the invention, a filter element for filtering cooling air for a handheld work tool is configured to form part of the outer side of the work tool and is mounted on the base of the work tool. The filter element includes a probing element for orienting the work tool, particularly for orienting the tool itself. The filter element has a sealing element for abutting against the base of the handheld work tool and for sealing between the filter element and the base. This prevents unfiltered cooling air from seeping into the base of the handheld work tool. Any possible gap between the work tool base and the filter element is sealed by the sealing element. Otherwise, unfiltered cooling air could be drawn in through this possible gap, which is eliminated by the invention. The sealing element achieves a very good filtering effect. According to the invention, the probing element and the sealing element are constructed of the same material. In particular, the probing element and the sealing element are composed of the same material. This simplifies the manufacture of the probing element and the sealing element. In particular, the probing element and the sealing element can be manufactured together. To manufacture both the probing and sealing elements, only a single material must be used. This saves on production costs and simplifies warehouse management.

[0082] In particular, the probing element and the sealing element are constructed from the same material, especially as an integral unit. Furthermore, the probing element and the sealing element are constructed coherently together. This simplifies the manufacture of the probing element and the sealing element. By being constructed as a co-integral probing element and the sealing element, they can be manufactured together in a single process step, especially by casting or injection molding. The co-manufacturing of the probing element and the sealing element as an integral probing element saves cost and time.

[0083] In particular, the probing element and sealing element are made of elastomers, especially thermoplastic elastomers. This allows for the simple manufacture of the probing element and sealing element. The probing element and sealing element can be manufactured, in particular, in a single casting process step, especially an injection molding process step.

[0084] In particular, the filter element has an inner side facing the base of the handheld tool in its mounting position. In particular, the filter element has an outer side facing away from the base of the handheld tool in its mounting position. In particular, the filter element has at least one flow-through opening, in particular at least two, in particular exactly two, in particular exactly four flow-through openings. In particular, at least one flow-through opening completely penetrates the filter element from the inside to the outside. This applies particularly to all flow-through openings. In particular, a probing and sealing element extends through at least one flow-through opening. Thus, the probing and sealing element can be manufactured in a simple manner in a single casting process step. Simultaneously, the probing and sealing element seals at least one flow-through opening during its manufacture. Therefore, unfiltered cooling air cannot flow through the filter element through at least one flow-through opening. This improves the filtration efficiency of the filter element.

[0085] In particular, the filter element has a frame. Specifically, the frame has a channel on the inner side of the filter element for accommodating a sealing element. Specifically, the frame has a probe element channel on the outer side of the filter element for accommodating a probe element. When manufacturing the sealing element, the material used to manufacture the sealing element can be cast, particularly injection molded, into the channel for accommodating the sealing element, and diffuses within the channel. Specifically, the sealing element then protrudes from the channel. Specifically, the edge of the channel for accommodating the sealing element has a lower height than the height of the sealing element. When manufacturing the probe element, the material used to manufacture the probe element can be cast, particularly injection molded, into the probe element channel, and diffuses within the probe element channel. This allows for the simple manufacture of both the sealing element and the probe element.

[0086] In particular, at least one flow-through opening connects the channel for accommodating the sealing element and the probe element channel for accommodating the probe element. Specifically, the channel for accommodating the sealing element is constructed on the inner side of the filter member. In particular, the probe element channel for accommodating the probe element is constructed on the outer side of the filter member. Due to at least one flow-through opening, the probe element and sealing element can be manufactured in a simple manner in a single casting process step. Here, the material for manufacturing the probe and sealing element can be introduced only on one side of the filter member. From this side, the material for manufacturing the probe and sealing element then flows either into the channel for accommodating the sealing element or into the probe element channel for accommodating the probe element to at least one flow-through opening, and thereby permeates to the other side of the filter member, so as to permeate into the corresponding other channel. Specifically, the casting site is located on the outer side of the filter member. Specifically, the material for manufacturing the probe and sealing element is first introduced via the casting site into the probe element channel for accommodating the probe element, and from there flows to at least one flow-through opening. In particular, the material used to manufacture the probing and sealing elements then flows through at least one flow-through opening onto the inside of the filter member into a channel for accommodating the sealing element. In particular, the substrate, especially the frame, and the probing element are contrasting in color. This allows for good identification of the probing element. Specifically, the probing element stands out in color from the substrate, especially the frame.

[0087] In particular, the directional elements are arranged on the outside of the filter components. This allows for quick and easy identification of the directional elements.

[0088] In particular, filter components used for cooling air filtration are part of handheld work tools.

[0089] Handheld work implements, particularly tools, include a filter element with a directional element on the outer side of the filter element as described above. The tool has a longitudinal extension. Specifically, the directional element has a piercing strip or a cutting strip. It can also be configured such that the directional element has both a piercing strip and a cutting strip. The piercing strip extends, in the installed position, primarily in the direction of the longitudinal extension. The cutting strip extends, in the installed position, primarily in a direction transverse to, and particularly perpendicular to, the longitudinal extension. The piercing strip provides the user with information about the orientation of the tool's longitudinal extension, even if the tool is not visible. This is helpful, for example, when the tool is obscured by a workpiece. This may be the case, for example, in a handheld power saw when a tool configured with a saw chain guide pierces the kerf. When felling trees, the cutting strip can indicate the direction in which the tree will fall.

[0090] In particular, the longitudinal direction of the piercing strips extends transversely to, and especially perpendicularly to, the longitudinal direction of the felling strips.

[0091] In particular, the piercing strip has a first piercing strip section and a second piercing strip section. In particular, the first piercing strip section and the second piercing strip section are constructed to be spaced apart from each other in a view along the flow direction.

[0092] In particular, the felling strip has a first felling strip section and a second felling strip section. In particular, the first felling strip section and the second felling strip section are constructed to be spaced apart from each other in a view along the flow direction.

[0093] In particular, the filter component of the handheld tool is designed in such a way that the integral, especially material-consistent and continuous design of the piercing strip and the cutting strip of the probing element on the outside of the filter component is indistinguishable. Furthermore, the piercing strip and the cutting strip are arranged in such a way that their integral, material-consistent design on the outside of the filter component is indistinguishable. Moreover, the piercing strip and the cutting strip are arranged so that they appear separated from each other by a cover, especially by a frame. This achieves a clear separation between the cutting strip and the piercing strip. This facilitates orientation using the piercing strip and the cutting strip.

[0094] The present invention also relates to a method for manufacturing a filter element for filtering cooling air for use in a handheld work tool. Accordingly, the filter element is configured to form part of the outer side of the work tool and is mounted on the base of the work tool. The filter element includes a pointing element for orienting the work tool, particularly for orienting the tool itself. The filter element has a sealing element for abutting against the base of the handheld work tool and for sealing between the filter element and the base. The pointing element and the sealing element are cast in a single casting process step. The pointing and sealing elements are constructed in this manner. This relates to the advantages described above in conjunction with the filter element. The pointing and sealing elements are, in particular, integral. The method according to the invention can be improved around the features described above in conjunction with the filter element. In particular, the pointing element and the sealing element are constructed of the same material and are coherently integrated as the pointing and sealing elements. Attached Figure Description

[0095] Embodiments of the present invention are described below with reference to the accompanying drawings. Wherein: Figure 1 A schematic diagram showing a side view of a handheld work appliance with a filter element for filtering cooling air is provided. Figure 2 Shown in side view Figure 1 The diagram illustrates the proportions of the filter components. Figure 3 A side view of the inner side of the filter component is shown. Figure 2 A realistic illustration of the proportions of the filter components. Figure 4aIt shows along according to Figure 1 The schematic diagram shows a cross-sectional view of plane IV-IV passing through a scaled-down working tool and a scaled-down filter element, which has a support fabric arranged on the outer side and a filter fabric arranged on the inner side. Figure 4b The alternative embodiments of the filter element shown are similar to those shown. Figure 4a The cross-sectional view shows that the filter element has a filter fabric arranged on the outer side and a support fabric arranged on the inner side. Figure 5 In Figure 4a and Figure 4b A magnified detail view of the portion marked with a "V" shows another alternative embodiment of the filter element, similar to... Figure 4a and Figure 4b The cross-sectional view shows that the filter element has a support fabric arranged on the outer side, another support fabric arranged on the inner side, and a filter fabric arranged between them. Figure 6a It shows Figures 1 to 5 A partial schematic diagram of a first variant of the support fabric for the filter element in the image. Figure 6b It shows Figures 1 to 5 A partial schematic diagram of the first variant of the filter fabric of the filter element in the diagram. Figure 7a It shows Figures 1 to 5 A partial schematic diagram of a second variant of the support fabric for the filter element in the design. Figure 7b It shows Figures 1 to 5 A partial schematic diagram of a second variant of the filter fabric for the filter element in the diagram. Figure 8 A partial perspective view of a support filter fabric is shown, which can be positioned according to... Figures 1 to 5 Instead of the fabric placed there, the filter components are used. Figure 9 It shows along Figure 8 A schematic diagram of the cross-sectional plane IX drawn in the diagram. Figure 10 The alternative designs for the filter components are shown. Figure 3 The illustration shows a filter element that includes a sealing element and a stop element. Figure 11 The image shows a perspective view of the first tool half of a casting tool with a pin, with a fabric filter element sleeved over the pin. Figure 12 It shows the way Figure 11 A cross-sectional view of the first tool half, which has fabric fitted onto the pin. Figure 13 It shows a state similar to that of the first tool half and the second tool half. Figure 12 In the cross-sectional view of the diagram, in this state, although the two tool halves are far apart from each other, the fabric is pressed against the support surface of the support element protruding from the first tool half by the retaining element protruding from the second tool half. Figure 14 It shows that the casting tool is parallel to the same state. Figure 13 A cross-sectional view of the cross-section of the plane in the middle. Figure 15 It shows something similar to Figure 13 A cross-sectional view of a casting tool, wherein the first and second tool halves are as close to each other as possible, and the fabric fitted onto the pin is located between the first and second tool halves. Figure 16 It shows something similar to Figure 2 The view of the filter component in the view, where, Figure 16 An alternative embodiment of the filter element is shown, wherein the filter element has a probing element. Figure 17 It shows along Figure 16 The cross-sectional view of the section plane XVII-XVII drawn in the figure. Figure 18 It shows along Figure 16 The cross-sectional view of the section plane XVIII-XVIII drawn in the figure. Figure 19 It shows Figure 16 An exploded perspective view of the filter components, showing the shapes of the probe and sealing elements. Figure 20 The base of the handheld working tool is shown. Figure 16 Partial perspective exploded view of the filter component. Figure 21 This shows the process in the assembled state. Figure 20 The cross-sections of the filter components and the substrate are presented in the image. Figure 22 It shows Figure 21 Detail illustrations marked XXII in the image. Figure 23 It shows along Figure 22 A schematic diagram of the cross-section of plane XXIII-XXIII in the diagram. Figure 24A schematic diagram of an alternative casting tool for manufacturing a filter element is shown, wherein the fabric of the filter element is threaded onto a pin of the casting tool between the two tool halves, and the pin abuts against both the first and second tool halves. Figure 25 It shows something similar to Figure 24 The diagram shows that the pin is no longer attached to the second tool half, but is instead used to push back the material used to manufacture the frame. Detailed Implementation

[0096] Figure 1 A handheld working tool 2 is shown. In an embodiment, the handheld working tool 2 is a handheld motorized chainsaw. However, the handheld working tool 2 can also be a free-cutting machine, wood cutter, saber saw, suction and / or blower, hedge trimmer, angle grinder, high-pole saw, lawnmower, or similar working tool. The working tool 2 is portable when used as intended. The working tool 2 is handheld when used as intended. In particular, the handheld working tool 2 is a motorized chainsaw. In an embodiment, the handheld working tool 2 is a so-called rear-handle chainsaw. However, the handheld working tool 2 can also be a chainsaw called a tree maintenance saw.

[0097] The working tool 2 has a tool 10. In an embodiment, the tool 10 is a guide rail 21 with a saw chain 31. The saw chain 31 is guided on the guide rail 21. Figure 1 As schematically shown by dashed lines, the handheld work tool 2 has a motor 24 for driving the tool 10, particularly the saw chain 31. In this embodiment, the motor 24 is an electric motor. The tool 10 may also be a saw blade, a cutting disc, a trimming wire, or the like. In this embodiment, the saw chain 31 rotates around a guide rail 21 during operation. The motor 24 drives the saw chain 31 in this embodiment. The motor 24 is arranged in a base 11. The base 11 has a housing.

[0098] The working tool includes an operating handle 23 in all embodiments. An operating element 22 is arranged at the operating handle 23. With the aid of the operating element 22, the operator can preset the power of the motor 24 or the rotational speed of the motor 24 or the tool 10, especially the saw chain 31. The operating handle 23 is part of the base 11 of the handheld working tool 2. The operating handle is located at the rear end of the base 11. At the front end of the base 11, the tool 10 (in this embodiment, a guide rail 21) protrudes from the base 11. Attached to the operating handle 23, the working tool 2 includes an arc-shaped handle 25. The arc-shaped handle 25 is used to carry and guide the working tool 2. The arc-shaped handle 25 is formed of a handle tube. The user can fully grasp the handle tube. The arc-shaped handle 25 is arranged between the operating handle 23 and the tool 10. In particular, the arc-shaped handle 25 is arranged between the operating handle 23 and the tool 10 in the side view.

[0099] Tool 10 is positioned away from the user during the operation of the working implement 2. Operating handle 23 faces the user during the operation of the working implement 2.

[0100] The handheld work appliance 2 includes a filter element 1. The filter element 1 is used to filter cooling air. The filter element 1 is configured to form part of the outer side 3 of the handheld work appliance 2. The filter element 1 is mounted on the base 11 of the work appliance 2. Figure 1 In this configuration, the filter component 1 forms part of the outer side 3 of the working device 2 and is mounted on the base 11 of the working device 2. Figure 1 In this embodiment, the filter element 1 is fastened to the base 11 by means of a fastening element 12. Cooling air can enter the working device 2 from the outside through the filter element 1. In this embodiment, the cooling air is used to cool the motor 24. With the help of the filter element 1, the cooling air is cleaned of particles and contaminants.

[0101] In this embodiment, the working device 1 includes a blower (not shown). The blower is used to draw in cooling air. The blower is arranged in the base 11. The motor 24 drives the blower. The blower draws the cooling air into the interior of the base 11 through the filter member 1.

[0102] The filter element 1 is disposed on one side of the base 11. In this embodiment, the tool 10 extends in the tool plane. The saw chain 31 operates in the tool plane. The tool plane divides the base 11 into a first half and a second half. The filter element 1 is disposed entirely in one of the two halves. In a side view perpendicular to the tool plane, the filter element 1 is identifiable and is only partially obscured by the bow-shaped handle 25. The bow-shaped handle 25 spans the base 11.

[0103] Especially Figure 2 and Figure 3 As shown, the filter element 2 has a fabric 70. The filter element 1, and especially the fabric 70, includes roving elements 4 and fine yarn elements 5, as shown in Figures 6 to 7. Figure 9 Presented in the image. To filter the cooling air, the fine yarn element 5 and the roving element 4 can be passed through by the cooling air. The roving element 4 and the fine yarn element 5 are both yarn-shaped. The roving element 4 is used to support the fine yarn element 5. The roving element 4 is thicker than the fine yarn element 5.

[0104] Yarn elements 4 and 5 are elongated formations extending along the longitudinal direction. Their cross-sections perpendicular to this longitudinal direction (especially those extending without a straight line) have a relatively rounded, particularly circular, outer contour. For example... Figure 6a or Figure 7a As shown, the roving element 4 has a diameter d1. The diameter d1 is measured perpendicular to the longitudinal direction of the roving element 4. The diameter d1 corresponds to the maximum elongation of the cross-section of the roving element 4.

[0105] like Figure 6b or Figure 7b As shown, each of the fine yarn elements 5 has a diameter d2. The diameter d2 is measured perpendicular to the longitudinal direction of the fine yarn element 5. The diameter d2 corresponds to the maximum elongation of the cross-section of the fine yarn element 5. The diameter d1 of the roving element 4 is larger than the diameter d2 of the fine yarn element 5. According to... Figure 1 In the embodiment shown in Figure 7, the roving element 4 is self-interwoven, particularly knitted into the support fabric 20, and the fine yarn element 5 is self-interwoven, particularly knitted into the filter fabric 30. A first variation of the support fabric 20 structure is... Figure 6a Presented in the middle. Figure 7a A second variation of the structure supporting fabric 20 is shown. A first variation of the structure of filter fabric 30 is shown. Figure 6b Presented in the middle. Figure 7b A second variation of the structure of the filter fabric 30 is shown. Figure 5 The diagram shows the filter fabric 30 supported on the support fabric 20 during operation. Specifically, the filter fabric 30 is directly supported on the support fabric 20 during operation. During operation, the filter fabric 30 rests against the support fabric 20. The yarn elements 5 of the filter fabric 30 contact the roving elements 4 of the support fabric 20 during operation. In particular, the filter fabric 30 and the support fabric 20 are in contact with each other when the filter element 1 is traversed by a cooling airflow. However, it is also possible to arrange the filter fabric 30 and the support fabric 20 to always be in contact with each other. The fabric 70 is formed jointly by the filter fabric 30 and the support fabric 20.

[0106] like Figure 4a or Figure 5 As shown, the support fabric 20 is arranged in the workpiece 2 such that it forms part of the outer side 3 of the workpiece 2. The filter fabric 30 faces the inner region 6 of the workpiece 2. However, the support fabric 20 and the filter fabric 30 can also be arranged in opposite directions, as shown in the diagram. Figure 4b As shown in the diagram, the filter fabric 30 is arranged such that it forms part of the outer side 3 of the working device 2. The advantage of the filter fabric 30 being smoother than the support fabric 20 is that the outer side 3 is also smoother than when arranged in the opposite direction. Dirt and filtered particles then penetrate the support fabric 20 to a reduced degree and cannot adhere to it to the same extent. Through vibration and impact during the operation of the working device 2, dirt and particles can be partially or completely loosened and fallen off the filter fabric 30 again. This also facilitates cleaning of the filter element 1 from the outside, for example, using a broom.

[0107] like Figure 6a or Figure 7a As shown, the support fabric 20 has a support mesh width a1. The filter fabric 30 has... Figure 6b or Figure 7b The filter mesh width a2 is shown in the figure. The mesh width is the net width between two adjacent yarn elements extending in the same direction. The mesh width defines which particle sizes are trapped by the support fabric 20 or the filter fabric 30. If the net width of the mesh is not the same in two directions perpendicular to the longitudinal extension of the intersecting yarns, the mesh width corresponds to the smaller of the two net widths. The support mesh width a1 of the support fabric 20 is greater than the filter mesh width a2 of the filter fabric 30.

[0108] like Figure 5 As shown in the illustration, alternatively, a separate support fabric 60 can be provided. In this case, the filter fabric 30 is arranged between the support fabric 20 and the separate support fabric 60. Fabric 70 is then formed by the filter fabric 30, the support fabric 20, and the separate support fabric 60. The separate support fabric 60 is similar to the support fabric 20, formed by additional roving elements. The additional roving elements are similar in construction to roving element 4. The additional roving elements of the separate support fabric 60 are themselves interwoven, in particular knitted, to form the separate support fabric 60. The separate support fabric 60 is constructed independently of the support fabric 20. The separate support fabric 60 is constructed independently of the filter fabric 30. Figure 4a and Figure 4b In the variant of filter element 1 presented in the image, the support fabric 20 and the filter fabric 30 are stacked layer by layer. Figure 5 In this configuration, support fabric 20, filter fabric 30, and additional support fabric 60 are stacked layer upon layer. In all cases, this forms a two- or multi-layer filter.

[0109] The filter element 1 is alternatively designed to have a support fabric 20 and a filter fabric 30, in accordance with Figures 1 to 5 In the filter element 1, the roving element 4 and the fine yarn element 5 can be interwoven, or in particular knitted, into a single supporting filter fabric 40. In this case, in particular, no additional supporting fabric 60 is provided. The filter fabric 70 is then formed solely from the supporting filter fabric 40.

[0110] Support filter fabric 40 Figure 8 and Figure 9 Presented in the middle. In the support filter fabric 40, the coarse yarn element 4 ensures sufficient mechanical stability of the support filter fabric 40, and the fine yarn element 5 results in the mesh width of the support filter fabric 40 being small enough for good filtration effect through the support filter fabric 40.

[0111] According to Figure 6a In one implementation, the roving elements 4 supporting the fabric 20 are interwoven in a plain weave. Similarly, Figure 6bThe fine yarn elements of the filter fabric 30 are also interwoven in a plain weave. In particular, the coarse yarn elements 4 and fine yarn elements 5 supporting the filter fabric 40 are interwoven in a plain weave, similar to... Figure 6a and Figure 6b The plain weave structure is presented in this way. In a plain weave, each warp yarn (warp thread) alternately lies above and below the weft yarn (weft thread), and each weft yarn alternately lies above and below the warp yarn. Warp yarns are the threads used for warping. Warp yarns are the total number of yarns of equal length wound approximately parallel around one or more warp beams and supplied from there in the longitudinal direction of the working part of the knitting machine. Weft yarns are the yarns that are fed laterally into the fabric, extending laterally, and especially perpendicularly to, the warp yarns. Currently, the term "yarn" can also be replaced by "silk thread" in all word combinations that include it. This is particularly apt for fabrics or knitted garments made of metal (or plastic). Accordingly, warp yarns can also be called warp threads, and weft yarns can also be called weft threads.

[0112] According to Figure 7a In one implementation, the roving elements 4 supporting the fabric 20 are interwoven in a twill weave. Similarly, Figure 6b The fine yarn elements of the filter fabric 30 are also interwoven in a twill weave. In particular, the coarse yarn elements 4 and fine yarn elements 5 supporting the filter fabric 40 are interwoven in a twill weave, similar to... Figure 7a and Figure 7b The twill weave is characterized by a distinctive diagonal pattern created by a specific arrangement of warp and weft yarns. In a twill weave, the weft yarn is guided over a warp yarn, then passes under at least two warp yarns, then over another warp yarn, and so on. This rhythm continues in the next row, shifted by one warp yarn. The shift always occurs in the same direction. This results in a surface structure with diagonal grooves, known as ribs.

[0113] The roving element 4 has greater stiffness than the fine yarn element 5. Similarly, the additional roving elements of the additional support fabric 60 also have greater stiffness than the fine yarn element 5. In embodiments, the roving element 4 and / or the fine yarn element 5 are made of metal, especially stainless steel, and particularly high-quality steel. However, it is also possible to configure the roving element 4 and / or the fine yarn element 5 to be made of plastic. These material descriptions apply both to embodiments where the filter element 1 includes support fabric 20 and filter fabric 30, and optionally additional support fabric 60, and to embodiments where the filter element 1 includes support filter fabric 40. Material combinations are also conceivable. For example, the roving element 4 may be made of metal, especially stainless steel, and particularly high-quality steel, and the fine yarn element 5 may be made of plastic. It is also conceivable that the roving element 4 is made of plastic, and the fine yarn element 5 is made of metal, especially stainless steel, and particularly high-quality steel. In the case where an additional support fabric 60 is provided, the additional roving elements of the additional support fabric 60 are made of the same material as the roving elements 4 of the support fabric 20. However, it is also possible to configure the additional yarn elements of the additional support fabric 60 to be made of a material that is correspondingly different from the roving elements 4 of the support fabric 20.

[0114] According to Figure 8 In this embodiment, the roving elements 4 and fine yarn elements 5 supporting the filter fabric 40 are interwoven into a satin weave. In particular, in a satin weave, either the warp or weft yarns are so tightly packed together that the mesh is no longer visible in the projection (zero mesh), thus achieving a very good filtration effect. Filtration occurs through gaps partially located within the interior of the satin weave. If the warp yarns are tightly packed together, it is also called a reverse satin or armored satin fabric. According to... Figure 8 In this embodiment, the roving element 4 extends along its longitudinal extension without significant local bending. The roving element 4 extends almost straight along its entire longitudinal extension. Slight bending may also be provided along the entire longitudinal extension of the yarn element 4. In particular, the roving element 4 is not bent in such a way as to the area where it intersects with the yarn element 5, so that its orientation matches the orientation of the intersecting yarn element 4.

[0115] Especially Figure 2 , Figure 3 , Figure 10 , Figure 16 , Figure 19 and Figure 20 As shown, the filter element 1 has a frame 7. The frame 7 covers the fabric 70. Figure 4a or Figure 4bAs shown, the filter element 1 is configured to be traversed by cooling air in the flow direction 50. The flow direction 50 extends transversely to, and in particular perpendicularly to, the surface of the fabric 70, especially the surface of the supporting fabric 20 and / or the filter fabric 30, or the surface of the supporting filter fabric 40. In the installed state of the filter element 1, the flow direction 50 extends transversely to, and in particular perpendicularly to, the outer side 3 of the working tool 2. It can also be configured such that the flow direction 50 extends perpendicularly to the tool plane of the tool 10. The frame 7, especially the circumferential frame 19 of the frame 7, surrounds the fabric 70 in a closed manner around the flow direction 50. The circumferential frame 19 covers the fabric 70 at the edge 78 of the fabric 70. The frame 7 restricts the fabric 70 from both sides of the fabric 70 with respect to the flow direction 50 of the cooling air. In particular, the frame 7 restricts the structural group, especially the structural unit, consisting of the filter fabric 30 and the supporting fabric 20, especially the additional supporting fabric 60, from both sides of the structural group, especially the structural unit, with respect to the flow direction 50 of the cooling air. In this embodiment, the frame 7 is injection molded around the fabric 70, particularly around the filter fabric 30 and the support fabric 20, particularly around the edges of the additional support fabric 60. The fabric 70, particularly the structural units formed by the filter fabric 30 and the support fabric 20, is then housed within the frame 7.

[0116] The frame 7 protrudes beyond the fabric 70 in the outward direction 3. Thus, the fabric 70 is at least partially protected from mechanical loads. The filter member 1 has a total height b1 measured in the flow direction 50 (e.g., for all embodiments in...). Figure 4a and Figure 4b (As shown in the diagram). The frame 7 has a point with a maximum spacing b2 from the fabric 70, wherein the maximum spacing b2 is measured in the flow direction 50. In an embodiment, there is a region 26 of the frame 7 surrounding the flow direction 50, which has a maximum spacing b2 from the fabric 70. The spacing b2 is at least 50%, and particularly at least 60%, of the total height b1 of the filter member 1.

[0117] In this embodiment, the filter element 1 has at least one connecting rib 8,9, and more particularly at least two connecting ribs 8,9. At least one connecting rib 8,9 is arranged on the fine yarn element 5 and / or the roving element 4. At least one connecting rib 8,9 is positioned on the outer side 3 of the working device 2. In the installed state of the filter element 1, at least one connecting rib 8,9 forms part of the outer side 3 of the working device 2. Figure 2 As shown, at least one connecting rib 8,9 connects two opposing portions of the circumferential frame 19.

[0118] The filter element 1 has a maximum extension g measured perpendicular to the flow direction 50°. At least two connecting ribs 8 and 9 have regions z, such as... Figure 2As illustrated in the figure. The length of region z, measured in the longitudinal direction of connecting ribs 8 and / or 9, is at least 20%, and particularly at least 30%, of the maximum extension g of filter member 1. In region z, at least two connecting ribs 8 and 9 extend without crossing. In region z, at least two connecting ribs 8 and 9 are constructed separately from each other. In region z, at least two connecting ribs 8 and 9 do not intersect. In region z, at least two connecting ribs 8 and 9 do not contact each other. In region z, no rib extends transversely to connecting ribs 8 and 9. In an embodiment, connecting ribs 8 and 9 extend substantially parallel to each other. The space between at least two ribs 8 and 9 in region z has no transverse ribs extending transversely to at least two ribs 8 and 9.

[0119] like Figure 5 As exemplarily shown with respect to connecting rib 9, at least two connecting ribs 8, 9 surround at least a portion of the roving element 4 on both sides with respect to the airflow direction 50 of the cooling air (in Figure 5 Included in the support fabric 20) and at least a portion of the yarn element 5 (in Figure 5 (Included in filter fabric 30).

[0120] like Figure 1 As shown, the filter element 2 can be fastened to the base 11 of the tool by a single fastening element 12. The fastening element 12 is a single component for fastening the filter element 2 to the base 11. The fastening element 12 is centrally arranged on the filter element 1. The fastening element 12 is arranged on the filter element 1 with a spacing from the circumferential frame 19, particularly in a direction perpendicular to the flow direction 50. The fastening element 12 is arranged in the surface of the fabric 70 with a spacing from the edge 78 of the fabric 70, particularly in a direction perpendicular to the flow direction 50. In particular, the fastening element 12 can be positioned perpendicular to the tool plane of the tool 10. Figure 1 In the side view of the filter element 1, it is approximately fastened in the middle, especially in the middle of the fabric 70, and particularly at the center of gravity of the surface associated with the outer contour 28 of the filter.

[0121] The fastening element 12 completely penetrates the fabric 70 in the flow direction 50. In an embodiment, the fastening element 12 is arranged in the area of ​​the connecting rib, such as, for example... Figure 2 As shown in the diagram, the fastening element 12 completely penetrates the connecting rib in the flow direction 50. In this embodiment, the fastening element 12 is a screw. This screw passes through the filter member 1 and is screwed into the base 11 of the working device 2. Here, the filter member 1 is pressed against the base 11.

[0122] In order to secure the filter member 1 to the substrate 11 using the fastening element 12, the filter member 1 can approach the substrate 11 in the fastening direction 49 during fastening. The fastening direction 49 is... Figure 2Presented in the embodiment. In this embodiment, the fastening direction 49 extends in the same direction as the flow direction 50. The fastening direction 49 extends laterally, and in particular perpendicularly, to the surface of the fabric 70, especially to the surface supporting the fabric 20 and / or the filter fabric 30, or the surface supporting the filter fabric 40. In the installed state of the filter member 1, the fastening direction 49 is laterally, and in particular perpendicularly, to the outer side 3 of the working device 2. The fastening element 12 fastens the filter member 1 to the base 11 with respect to the fastening direction 49.

[0123] With the filter element 1 in its tightened state, the filter element 1 forms part of the outer side of the working device. Through the filter element 1, cooling air can then flow from the outside into the inner region 6 of the working device 2 in the flow direction 50.

[0124] The outer shell of the base 11 has an outer shell contour 27 in a side view perpendicular to the tool plane of the tool 10, as shown below. Figure 1 As shown in the diagram. The outer contour 27 of the housing limits the imaginary housing area in its imaginary projection onto the tool plane. This projection is in a direction perpendicular to the tool plane. The filter member 1, especially the fabric 70, has a filter outer contour 28 in its imaginary projection onto the tool plane. This projection is in a direction perpendicular to the tool plane. The filter outer contour 28 limits the imaginary filter area in the tool plane. The filter area is at least 5%, especially at least 10%, especially at least 15%, especially at least 18% of the housing area. Thus, the filter member 1 occupies a large portion of the outer side 3 of the working tool 1 in the side view. The filter member 1 is large compared to filter members known from the prior art. When fastened using only a single fastening element 12, significant warping of the filter member 1 is absolutely possible due to its large size. The filter member 1 is able to abut against the base 11 at one location with its edge, and not at other locations, especially opposite locations.

[0125] like Figures 16 to 19 and Figure 22 As shown, a sealing element 77 is arranged between the filter element 1, particularly the frame 7 of the filter element 1, and the base 11. Although Figures 16 to 23 Alternative embodiments are shown, but this applies to all embodiments, and is further illustrated below. Figures 16 to 23 The following embodiments are used as examples to describe the application of all embodiments in a more detailed manner. The sealing element 77 is used to seal between the substrate 11 and the filter member 1, particularly the frame 7 of the filter member 1, to prevent air from entering or escaping. The sealing element 77 is made of an elastomer, particularly a thermoplastic elastomer. The sealing element 77 extends along... Figure 19 and Figure 20The surrounding direction 48 is particularly closed. The flow direction 50 and / or the fastening direction 49 extend transversely to, and particularly perpendicular to, the surrounding direction 48. In the view along the flow direction 50 and / or the fastening direction 49, the sealing element 77 is closedly surrounding the fastening element 12. The fastening element 12 is arranged approximately in the middle of the closed surrounding sealing element 77. The sealing element 77 is closedly surrounding the flow direction 50 and / or the fastening direction 49.

[0126] The sealing element 77 is deformable, particularly elastically deformable, particularly compressible, and particularly elastically compressible in the fastening direction 49 between the filter member 1, especially the frame 7, and the base 11. When fastening the filter member 1 to the base 11, it may be necessary to apply considerable pressure to the filter member 1 using the fastening element 12 so that the sealing element 77 seals throughout between the filter member 1, especially the frame 7, and the base 11, and compensates for any possible warping of the filter member 1, especially the base 11. To avoid undesirable large, particularly elastic compression, and particularly deformation of the sealing element 77, the working device 2 includes at least one stop element 130, such as... Figure 23 As shown in the image.

[0127] In this embodiment, the fabric 70 is at least partially, and especially entirely, made of metal. The frame 7 is made of plastic.

[0128] At least one stop element 130 is arranged between the base 11 and the frame 7. During the fastening of the filter member 1 to the base 11, the proximity of the frame 7 and the base 11 in the fastening direction 49 is limited by the stop element 130. This avoids undesirable deformation, especially compression, of the sealing element 77 in the area of ​​the stop element 130. The stop element 130 spans the gap 131 between the base 11 and the frame 7. In particular, the stop element partially spans the gap 131. The gap 131 is located in… Figure 22 and Figure 23 The stop element 130 extends, particularly with respect to the circumferential direction 48, partially and restricted across the gap 131 between the base 11 and the frame 7. Specifically, the stop element 130 extends only over a partial region of the complete circumference of the sealing element 77 in the circumferential direction 48. This partial region corresponds, particularly with respect to the circumference around the fastening element 12, to an angle range of <20°. Specifically, the angle range is >0.5°. Specifically, the stop element 130 extends across the gap 131 between the frame 7 and the base 11 such that a first gap c1, measured in the fastening direction 49, is constructed between the frame 7 and the base 11 in the circumferential direction 48 before the stop element 130, and a second gap c2, measured in the fastening direction 49, is constructed in the circumferential direction 48 after the stop element 130. In an embodiment, the first gap c1 and the second gap c2 are equally large.

[0129] In particular, at least one stop element 130 restricts the sealing element 77 from compression, and especially from deformation, in the fastening direction 49, particularly elastically. The frame 7 and the base 11 are stiffer than the sealing element 77. The sealing element 77 is elastic. In an embodiment, the sealing element 77 is a thermoplastic elastomer.

[0130] The sealing element 77 is located between the frame 7 and the base 11. Figure 22 The compression portion 132, when fully compressed, especially deformed, has a compression height h2 measured in the fastening direction 49. The sealing element 77, in its uncompressed state, has a sealing element height h2 measured in the same direction 49 at the same compression portion 132. The uncompressed state is also referred to as the undeformed state. In particular, at least one stop element 130 restricts the compression, especially deformation, of the sealing element 77 in the fastening direction 49 at the compression portion 132 such that the compression height h2 is at least 50%, especially at least 70%, especially at least 80%, especially at least 90%, especially at least 95% of the sealing element height h1. It can be configured such that, during the fastening of the filter member 1 to the base 11 by means of the fastening element 12, the sealing element 77 is compressed, especially deformed, from the sealing element height h2 to the sealing element height h1 at the compression portion 132. The stop element 130 restricts the compression, especially deformation, of the sealing element 77 at the compression portion 132 to the compression height h2.

[0131] Especially Figure 22 As can be seen, the sealing element 77 is essentially U-shaped in cross-section transverse to, and especially perpendicular to, the circumferential direction 48. The open end of the U points towards the base 11 in the fastening direction 49. The two legs of the U surround a tab 29 protruding towards the filter member 1 in a direction opposite to the fastening direction 49. At least one leg abuts against the tab 29. Figure 20 As shown, the tab 29 is closed around the fastening element 12 in the circumferential direction 48. The sealing element 77 forms a groove for receiving the circumference of the tab 29. For sealing between the frame 7 and the base 11, it is not necessary for the bottom of the groove to abut against the tab 29. It is sufficient for at least one of the groove flanks to abut against the tab 29, especially circumferentially.

[0132] like Figure 10 As shown, frame 7 has frame edges 17 that are particularly closed around the perimeter in the circumferential direction 48. Figure 20 As shown, the base 11 has a base surface 18 that is particularly closed and surrounds in the circumferential direction 48. The base surface 18 is also referred to as a base annular surface in the embodiment. In particular, at least one stop element 130 protrudes beyond the frame edge 17 in the fastening direction 49 and / or protrudes beyond the base surface 18 in the direction opposite to the fastening direction 49. According to... Figure 10In one embodiment, at least one stop element 130 is fixed to the frame 7 of the filter member 1. However, it can also be configured such that at least one stop element 130 is fixed to the base 11 of the handheld work tool 2, or as per [other configuration]... Figure 20 and Figure 21 The embodiment is fixed to both the base 11 and the frame 7. If at least one stop element 130 is fixed to both the frame 7 and the base 11, then the stop element 130 is separable.

[0133] In this embodiment, at least one stop element 130 is constructed in the same material as, and particularly integrally with, the frame 7. At least one stop element 130 is constructed in the same material as the frame 7. At least one stop element 130 is made of plastic.

[0134] In one embodiment, at least one stop element 130 is configured as a bolt. The bolt has a diameter, measured particularly transversely to, particularly perpendicular to, the fastening direction 49, and particularly perpendicular to the flow direction 50. The diameter of the bolt is 1 mm to 6 mm, particularly 2 mm to 5 mm.

[0135] When the filter element 1 is fastened to the substrate 11, the filter element 1 impacts the substrate 11 with its stop element 130 in the embodiment, especially at the substrate surface 18.

[0136] The distance r between the sealing element 77 and at least one stop element 130, measured in a direction perpendicular to the fastening direction 49, is less than five times, particularly three times, particularly one time, the height h1 of the sealing element. The distance r is measured in a direction perpendicular to the circumferential direction 48. In an embodiment, the distance r is greater than 10% of the height h1 of the sealing element. However, it is also possible to configure the sealing element 77 and at least one stop element 130 to have no distance between them.

[0137] like Figure 10 As shown, at least two, and in particular a plurality of, stop elements 130 are provided, which are spaced apart from each other with respect to the circumferential direction 48. In an embodiment, at least two of the at least two stop elements 130 have an angular distance of at least 135° from each other, measured in the circumferential direction 48. In an embodiment, a total of six stop elements 130 are provided. In an alternative embodiment, only a single stop element 130 may be provided.

[0138] During the fastening of the filter element 1 to the base 11, the filter element 1 approaches the base 11 in the fastening direction 48 by means of a fastening element 12. In an embodiment, the fastening element 12, configured as a screw, is screwed into the base 11. During the fastening of the filter element 1 to the base 11, the approach of the frame 7 and the base 11 with respect to the fastening direction 48 is limited by at least one stop element 130.

[0139] according to Figure 10 The filter element 1 in Figures 11 to 15 (especially) Figure 13 The filter element 1 is manufactured in the casting tool 69 presented in the diagram, particularly in the injection molding tool. First, a test filter element without a stop element 130 is manufactured in the casting tool 69. This test filter element is fastened to the base 11 of the workpiece 2 to determine where and in what form at least one stop element 130 is needed. Then, the casting tool 69 is modified such that at least one stop element 130 is generated during the casting process steps, particularly the injection molding process steps, when the filter element 1 is subsequently manufactured in the modified casting tool 69. Subsequently, other filter elements 1 are manufactured using the modified casting tool 69. It is not necessary to modify the casting tool 69 again. A single modification of the casting tool 69 is sufficient to subsequently manufacture many filter elements 1. These filter elements 1 are then adapted to all bases 11 manufactured using the same base casting tool, to which the modified casting tool 69 is adapted.

[0140] Modifications to the casting tool 69 may involve milling recesses in the casting tool 69, particularly in one or both of the two tool halves 71 and 72 of the casting tool 69, and / or installing protrusions in the casting tool 69, particularly in one or both of the two tool halves 71 and 72 of the casting tool 69. Modifications may be made at multiple locations.

[0141] like Figure 1 As shown, tool 10, and in particular guide rail 21, has a longitudinal central axis 13. Viewed in the direction of airflow 50, the longitudinal central axis 13 is arranged between at least two connecting ribs 8 and 9 in this embodiment. In this embodiment, viewed in the direction of airflow 50, the longitudinal central axis 13 is arranged between connecting ribs 8 and 9.

[0142] According to Figures 16 to 23 In an alternative embodiment, the filter member 1 includes a directional element 110. The directional element 110 is configured as a directional aid for orienting the workpiece 2, particularly for orienting the tool 10 of the workpiece 2, particularly the guide rail 21. In the filter member 1 mounted on the base 11, the directional element 110 is arranged at a distance from the tool. Even if the tool is covered, for example by a workpiece cover or inserted into the workpiece to be processed, the orientation and position of the tool 10 can be determined via the directional element 110. The directional element 110 is part of the outer side 3 of the workpiece 2. The directional element 110 is arranged on the frame 7 of the filter member 1.

[0143] The probing element 110 and the sealing element 77 are constructed of the same material. The probing element 110 and the sealing element 77 are integrally constructed as a probing and sealing element 111. This is especially true in... Figure 19 As can be seen, the probing element 110 and the sealing element 77 are constructed together as a probing and sealing element 111. The probing element 110 and the sealing element 77 are jointly manufactured in a single process step, especially a casting process step, especially an injection molding process step.

[0144] Not only the probing element 110, but also the sealing element 77 is made of thermoplastic elastomer.

[0145] like Figure 17 As shown, the filter member 1 has an inner side 14 facing the substrate 11 in its mounting position and an outer side 15 facing away from the substrate 11 in its mounting position. At least one flow-through opening 16 completely penetrates the filter member 1 from the inner side 14 to the outer side 15. The location of the at least one flow-through opening 16 is... Figure 16 The diagram is schematically drawn using dotted circular lines. The flow-through opening 16 completely penetrates the filter element 1, and particularly the frame 7 of the filter element 1, in the flow direction 50. Through the flow-through opening 16, material, especially plastic material, can flow during the casting process steps, particularly during the injection molding process steps, and especially during the plastic injection molding process steps. At least two flow-through openings 16 are provided, and in this embodiment, four flow-through openings 16 are provided.

[0146] The probe and sealing element 111 extends through the flow-through opening 16. The probe and sealing element 111 completely fills the flow-through opening 16.

[0147] like Figure 17 and Figure 18 As shown, the frame 7 has a channel 80 at the inner side 14 of the filter member 1 for receiving the sealing element 11. The frame 7 has a probe element channel 114 at the outer side 15 of the filter member 1 for receiving the probe element 110. The channel 80 has a groove shape. During the injection molding process step, the open long side of the groove of the channel 80 faces... Figure 13 The second tool half 72 of the casting tool 69 is presented. The probing channel 114 has a groove shape. During the injection molding process steps, the open long side of the groove of the probing channel 114 faces... Figure 13 The first tool half 71 of the casting tool 69 presented in the middle.

[0148] The flow opening 16 connects the channel 80 and the probing element channel 114 to each other. During the casting process steps, especially during the injection molding process steps, and especially during the plastic injection molding process steps, material, especially plastic, can flow through the probing element channel 114 on the outer side 15 of the filter member 1 to the flow opening 16, and through the flow opening 16 to the channel 80 on the inner side 14 of the filter member 1. The flow opening 16 is a connecting hole in the frame 7 for connecting the inner side 14 and the outer side 15. The probing element 110 and the sealing element 77 are cast in a single casting process step, especially a single injection molding process step, and especially a single plastic injection molding process step. The probing and sealing element 111 is constructed here. In particular, the probing and sealing element 111 is constructed integrally here.

[0149] The probing element channel 114 has a channel width k, particularly measured in the direction perpendicular to the fastening direction 49 and especially in the flow direction 50, such as... Figure 19 As shown in the figure. The flow opening 116 has in Figure 18 Or the diameter d presented in 17. The diameter d is measured, in particular, perpendicular to the fastening direction 49 and, in particular, the flow direction 50. In the embodiment, the diameter d of the flow opening 116 is at least 60%, in particular at least 70%, and in particular at least 80% of the channel width k. In particular, the diameter d of the flow opening is at least 0.5 mm and in particular at least 1 mm. Thus, the flow opening 116 is large enough to allow material to flow well through the flow opening. In particular, the diameter d of the flow opening 116 is at most 4 mm and in particular at most 3 mm. Thus, the flow opening 116 is small enough to allow the flow opening to be well filled with a small amount of material.

[0150] The probe element 110 is arranged on the outer side 15 of the filter member 1. The sealing element 77 is arranged on the inner side 14 of the filter member 1. The substrate 11 and the probe element 110 are contrasting in color. The substrate 11 has a different color from the probe element 110 at its outer side 3. The frame 7 and the probe element 110 are also contrasting. The frame 7, which is directly adjacent to the probe element 110, has a different color from the probe element 110 at that location. In particular, the probe element 110 is monochromatic. In particular, the frame 7 is monochromatic.

[0151] Tool 10 has a longitudinal extension. The longitudinal extension of tool 10 extends along the longitudinal central axis 13 of tool 10, particularly along guide rail 21. Probing element 110 has a piercing bar 112 and / or a cutting bar 113. In an embodiment, probing element 110 has both piercing bar 112 and cutting bar 113. The piercing bar 112 extends substantially in the direction of the longitudinal extension, particularly in the direction of the longitudinal central axis 13, in the mounting position of filter member 1. The cutting bar 113 extends transversely to, particularly perpendicular to, the longitudinal extension, particularly in the direction of the longitudinal central axis 13, in the mounting position of filter member 1. This is particularly applicable to views of the working tool 2 along the flow direction 50. This is particularly applicable to views perpendicular to the tool plane of tool 10.

[0152] The piercing strip 112 has a first piercing strip section 115 and a second piercing strip section 116. The first piercing strip section 115 and the second piercing strip section 116 are constructed to be spaced apart from each other in a view along the flow direction 50.

[0153] The felling strip 113 is particularly characterized by a first felling strip section 117 and a second felling strip section 118. The first felling strip section 117 and the second felling strip section 118 are constructed to be particularly spaced apart from each other in a view along the flow direction 50.

[0154] The piercing strip 112 and the cutting strip 113 of the probing element 110 are not visible due to their uniform material, especially their monolithic construction, on the outer side 15 of the filter member 1. In a view of the outer side 15 of the filter member 1 along the flow direction 50, the cutting strip 113 and the piercing strip 112 appear to be structural elements constructed separately from each other. The connection between the piercing strip 112 and the cutting strip 113 is not visible from the outside. The piercing strip 112 and the cutting strip 113 are arranged such that the uniform material, especially their monolithic construction, of the piercing strip 112 and the cutting strip 113 of the probing element 110 on the outer side 15 of the filter member 1 is not visible. The piercing strip 112 and the cutting strip 113 are arranged such that they appear to be separated from each other by a cover, especially by a frame.

[0155] In manufacturing the filter element 1, for all embodiments, the fabric 70 is cast between the first tool half 71 and the second tool half 72 in the casting method step, thereby creating the frame 7. Figures 12 to 15 Only for those based on Figure 10 The embodiment illustrates the positioning of fabric 70 between the first tool half 71 and the second tool half 72. Figure 15In the position shown, the fabric 70 is clamped between the first tool half 71 and the second tool half 72. The pin 73 completely penetrates the fabric 70 in the direction of the first tool half 71 and the second tool half 72. During the casting process step, at the location of the pin 73, a retaining opening 75 is created in the frame 7, completely penetrating the frame 7 in the direction of the first tool half 71 and the second tool half 72. The position of the retaining opening 75 is... Figure 10 The diagram is shown. Specifically, the pin 73, which holds the fabric 70 in place during the casting process step, penetrates the fabric 70 at a location where it is so covered by injection during the casting process step that a frame 7 is created at and / or around that location. To allow the pin 73 to penetrate the fabric 70, the fabric 70 has a channel opening 74. According to... Figure 10 In one embodiment, the opening 75 is kept to completely penetrate the frame 7 in the flow direction 50. According to... Figure 25 In an alternative embodiment, the retaining opening 75 is not generated at all.

[0156] In both cases, the filter element 1 includes a blocking element that prevents the filter element 1 from being circulated by cooling air in the area of ​​the channel opening in the flow direction 50.

[0157] According to Figure 10 In this embodiment, the channel opening 74, and especially the retaining opening 75 in the frame 7, is closed by a closure element 76 made of an elastomer in a sealing step following the casting method step. In this case, the blocking element is the closure element 76. In particular, the closure element 76 is made of a thermoplastic elastomer. The channel opening 74 completely penetrates the fabric 70 in the direction from the first tool half 71 toward the second tool half 72, especially in the direction opposite to the flow direction 50. During the casting method step, the pin 73 is guided through the channel opening 74.

[0158] During the casting process step, the fabric 70 is securely threaded onto the pin 73 through the channel opening 74. During the casting process step, the pin 73 contacts both the first tool half 71 and the second tool half 72. The movement of the fabric 70 in or against the penetration direction 50 is restricted by either the first tool half 71 or the second tool half 72. The fabric 70 cannot be detached from the pin 73.

[0159] In all embodiments, fabric 70 is rigid in bending. In particular, fabric 70 is self-supporting. When supported at a single point, fabric 70 is shape-stable.

[0160] In all embodiments, frame 7 is manufactured by means of injection molding, particularly by means of plastic injection molding, in the casting process step.

[0161] Filter component 1 includes Figure 10 The connecting structure 32 is presented in the image. The connecting structure 32 connects at least two opposite portions of the circumferential frame 19 of the frame 7. The connecting structure 32 is a component of the frame 7. The connecting structure 32 includes connecting ribs 8 and 9. According to... Figure 10 In this embodiment, the retaining opening 75 is located in the connecting structure 32. In particular, a second retaining opening is provided in the connecting structure 32. A channel opening 74 is also arranged at the location of the retaining opening 75. For all embodiments with a channel opening, the channel opening 74 is arranged at a distance from the circumferential frame 19. This distance is measured perpendicular to the fastening direction 49, and especially perpendicular to the flow direction 50. The distance between the channel opening 74 and the edge 78 of the fabric 70, especially measured in a direction perpendicular to the flow direction 50, and especially the fastening direction 49, is arranged in the plane of the fabric 70. In particular, the channel opening 74 is perpendicular to the tool plane of the tool 10. Figure 1 In the side view (not shown here), it is arranged approximately in the middle of the filter member 1, especially in the middle of the fabric 70. In particular, the channel opening 74 is arranged in this side view near the center of gravity of the face associated with the outer contour 28 of the filter.

[0162] like Figure 13 , Figure 14 and Figure 15 As the comparison shows, in all embodiments with channel openings, after the fabric 70 is threaded onto the pin 73, the fabric 70 moves together with the support element 83 (on its support surface 82) and the second tool half 72 toward the first tool half 72, such that the fabric 70 eventually rests against both the first tool half 71 and the second tool half 72. During the movement of the first tool half 71 and the second tool half 72 toward each other, the distance between the support element 83 and the first tool half 71 is reduced to such an extent that it eventually disappears. Similarly, the retaining element 84 disappears from the second tool half 72 as the first tool half 71 and the second tool half 72 move toward each other. The second retaining element 84 eventually no longer protrudes from the second tool half 72.

[0163] In all embodiments, during the casting method steps, the fabric 70 is overlaid and cast together with the frame 7. According to... Figure 10 In one embodiment, a retaining opening 75 is created in the frame 7. After the casting process step, the retaining opening 75 is closed by a closing element 76. The closing element 76 is cast while the frame 7 and the fabric 70 are located between the first tool half 71 and the second tool half 72. In all embodiments, the fabric 70, particularly the filter member 1, is continuously located between the first tool half 71 and the second tool half 72 between the casting process step and the sealing process step.

[0164] In all embodiments, the sealing element 77 is manufactured in the sealing method step. First, plastic is introduced into the casting tool 69 in the casting method step. Then, an elastomer, particularly a thermoplastic elastomer, is introduced into the casting tool 69 in time. The sealing element 77 is then manufactured.

[0165] According to Figure 10 In one embodiment, the sealing element 77 and the closing element 76 are cast in a single casting step. The sealing element 77 and the closing element 76 are constructed of the same material, particularly integrally. During the injection of material for manufacturing the sealing element 77, the retaining opening 75 in the frame 7 is used to vent air displaced by the material used to manufacture the sealing element 77 during the sealing method step. This applies to... Figure 10 Examples of implementations.

[0166] Frame 7 has, in all embodiments, a gating opening 79 for injecting material for manufacturing sealing element 77, as exemplarily in Figure 10 As shown in the illustration. In the embodiment, the material used to manufacture the sealing element 77, and especially the material used to manufacture the probe and sealing element 111, is applied to the filter member 1, and especially to the frame 7, on the outer side 15. The material used to manufacture the frame 7, especially the plastic material, and the material used to manufacture the sealing element 77, especially the material used to manufacture the probe and sealing element 111, especially the thermoplastic elastomer, are introduced on the same side of the filter member 1, especially the frame 7, especially on the outer side 15. Thus, a simple design of the corresponding casting tool is feasible.

[0167] According to Figure 10In this embodiment, the material used to manufacture the sealing element 77 passes through the casting opening 79 from the outer side 15 to the inner side 14 into the channel 80. The material flows into the channel 80 and forms the sealing element 77 within it. Here, the material, particularly the thermoplastic elastomer, displaces air. This air can escape through the retention opening 75 in the frame 7. As described above, the channel 80 for receiving the sealing element 77 extends at the edge of the frame. The channel 80 is closed around the frame in the circumferential direction 80. The retention opening 75 is arranged at a distance from the edge of the frame. The channel 80 and the retention opening 75 are interconnected via a connecting channel 81 in the frame 7. The connecting channel 81 extends from the channel 80 to the retention opening 75. The connecting channel 81 is constructed in the connecting rib 8. In this embodiment, the connecting channel 81 is also constructed in the connecting rib 9. The channel 80 and the connecting channel 81 are arranged on the inner side 14 of the filter member 1. The retention opening 75 completely penetrates the frame 7 from the inner side 14 towards the outer side 15 in a direction opposite to the flow direction 50. During the manufacture of filter element 1, particularly during the sealing process step, the inner side 14 of filter element 1 faces the first tool half 71. During the previous casting process step, channels 80 and connecting channels 81 are completely filled by the components of the first tool half 71. This creates channels 80 and connecting channels 81. During the casting process step, cavities are constructed between the first tool half 71 and channels 80, and between the first tool half 71 and connecting channels 81. In this embodiment, these cavities are provided so that a placeholder protruding towards the fabric 70 during the casting process step can be removed from or pulled back into the first tool half 71. This creates a location for material that flows into channels 80 to create sealing element 77. Similarly, a location is created for material that flows through connecting channels 81 into and completely fills retaining opening 75, thereby creating sealing element 76. Here, the air displaced by the material used to manufacture sealing element 77 and sealing element 76 can escape on the outer side 15 of filter element 1. Therefore, in the sealing process step, channel 80 and connecting channel 81 can continue to be covered, especially airtightly, by the first tool half 71. The expelled air can flow through the space not yet fully filled by the material used to manufacture the sealing element 77 through channel 80 and connecting channel 81 to the retaining opening 75 and escape on the outer side 15 of the filter member 1. Thus, venting of channel 80 and connecting channel 81 can be easily performed during the sealing process step. In a simple manner, the sealing element 77 and the sealing element 76 can be manufactured in a single casting process step. In this casting process step, not only the sealing element 77 but also the sealing element 76 is made of thermoplastic elastomer. The retaining opening 75 is then closed by the sealing element 76, which is made of elastomer, especially thermoplastic elastomer.

[0168] According to Figures 16 to 23In this embodiment, venting during the sealing method step is performed in a different manner. The location of the gating opening 79 is... Figure 16 and Figure 19 The material for manufacturing the probe and sealing element 111 is marked as such. It is located above the probe element channel 114, particularly above the channel used to construct the piercing strip 112. Starting from the casting opening 79, the material for manufacturing the probe and sealing element 111 flows in two directions within the probe element channel 114, particularly in the channel used to form the piercing strip 112. One direction guides it away from the circumferential frame 19, and the other direction guides it towards the circumferential frame 19 and towards the flow opening 16. Figure 19 Through the flow opening 16, material flows from the outer side 15 of the filter element 1, especially the frame 7, to the inner side 14 of the filter element 1, especially the frame 7. Figure 17 and Figure 18 On the inner side 14 of the filter element 1, particularly the frame 7, material flows through the channel 80 and is thus constructed as part of the sealing element 77 and the probing element 111. Through another flow-through opening 16, material again travels from the channel 80 on the inner side 14 to the outer side 15 and flows there in the channel used to construct the cutting bar 113. Both the channel used to construct the cutting bar 113 and the channel used to construct the piercing bar 112 are components of the probing element channel 114. The channel used to construct the cutting bar 113 and the channel used to construct the piercing bar 112 are constructed separately from each other. The longitudinal extension of the channel used to construct the cutting bar 113 extends transversely, and particularly perpendicularly, to the longitudinal extension of the channel used to construct the piercing bar 112, especially in the view along the flow-through direction 50. In the view along the flow-through direction 50, the imaginary extensions of the channel used to construct the cutting bar 113 and the channel used to construct the piercing bar 112 intersect orthogonally. At the end of the channel used to construct the cutting strip 113, an additional flow opening is constructed from the outer side 15 to the inner side 14. Through this opening, venting of material diffuses from the casting opening 79 toward the circumferential frame 19. In another direction, venting is carried out through an additional flow opening from the outer side 15 to the inner side 14 at the end of the channel used to construct the piercing strip 112.

[0169] In the alternatives based on Figure 10 In one embodiment of the implementation scheme, the blocking element (by preventing the filter element 1 from being cooled by the flow of air through the channel opening 74 region in the flow direction 50) can be formed in a manner different from that of the closing element 76. Figure 25 The corresponding filter element 1 is schematically shown. What all embodiments have in common is that the channel opening 74, and especially the edge of the channel opening 74, is surrounded by the material of the frame 7. Figure 10 In the middle, the channel opening 74 is surrounded by a retaining opening 75 formed by the frame. According to... Figure 25In one embodiment, the channel opening 74 is surrounded by the frame 7 in a direction perpendicular to the flow direction, particularly in the radial direction.

[0170] The channel opening 74 is covered by the connecting structure 32. In all embodiments, the connecting structure 32 connects at least two portions of the circumferential frame 19 to each other. Regarding this connection, according to... Figure 25 The connection structure 32 in the implementation method is similar to Figure 10 The connection structure 32 presented in the middle is constructed.

[0171] According to Figure 25 In one embodiment, the blocking element is the covering section 33. The covering section 33 is in Figure 25 The area is marked with a dashed line. The coverage section 33 is located only in the region above or below the channel opening 74 in the direction along the flow direction 50 or in the direction opposite to the flow direction 50. The coverage section 33 is located only in the region projected onto the channel opening 74 in the direction along the flow direction 50 or in the direction opposite to the flow direction 50. In an embodiment, the coverage section 33 is formed by a segment of the frame 7.

[0172] In all embodiments, the barrier covers the channel opening 74 in a view along the flow direction 50. According to... Figure 25 In this embodiment, the covering section 33 completely covers the channel opening 74. Unlike the closing element 76, the covering section 33 is spaced apart from the channel opening 74, and especially from the fabric 70, particularly with respect to the flow direction 50. The blocking element, according to... Figure 25 In the embodiment, the channel opening 74 is covered in a dome shape.

[0173] Frame 7 has a frame thickness s1 measured in the flow direction 50 in the region surrounding the channel opening 74. The frame thickness s1 is measured adjacent to the cover section 33. The frame thickness s1 is adjacent to the channel opening 74, particularly to the edge of the channel opening 74, and especially measured at the edge of the channel opening 74. The cover section 33 has a cover thickness s2 measured in the flow direction 50. The cover thickness s2 corresponds to the maximum extension of the cover section 33 in the flow direction 50. In this embodiment, the cover thickness s2 is measured adjacent to the channel opening 74, particularly at the edge of the channel opening 74. The cover section 33 has a minimum cover thickness s3 measured in the flow direction 50. The minimum cover thickness s3 corresponds to the minimum extension of the cover section 33 in the flow direction 50. The minimum cover thickness s3 is measured above the channel opening 74, and in this embodiment at the center of the channel opening 74.

[0174] The coverage thickness s2 is at most 50%, especially at most 20%, and especially at most 5% of the frame thickness s1.

[0175] The coverage thickness s2 is at least 1% of the frame thickness s1.

[0176] The coverage thickness s2 is 0.01mm to 5mm, especially 0.05mm to 2mm.

[0177] The blocking component is based on Figure 25 In the embodiment, it is formed of the material of frame 7.

[0178] Figure 24 and Figure 25 An alternative casting tool is shown, having a first tool half 71 and a second tool half 72. This alternative casting tool is used to manufacture according to... Figure 25 The alternative embodiment includes filter element 1. The alternative casting tool includes a first tool half 71, a second tool half 72, and at least one pin 73.

[0179] In manufacturing the alternative filter element 1, the fabric 70 is cast in a casting process step between the first tool half 71 and the second tool half 72, thereby creating a frame 7. At least one pin 73 is guided through the channel opening 74 during the casting process step to hold the fabric 70 in place. A barrier is provided to prevent the filter element 1 from being flowed through in the region of the channel opening 74 in the flow direction 50 by cooling air. This barrier is formed by the frame 7 during the casting process step.

[0180] During the casting process step, the material used to manufacture the frame 7 permeates into the area between the pin 73 and the alternative casting tool. At the start of the casting process step, the pin 73 may be abutted against both the first tool half 71 and the second tool half 72 of the alternative casting tool. During the casting process step, the pin 73 is removed from the second tool half 72. In an embodiment, this occurs due to the pressure of the material used to manufacture the frame 7. Alternatively, the pin 73 may also be arranged at a distance from the second tool half 72. This distance may be present at the start of the casting process step. In particular, this distance is not changeable during the casting process step. In particular, the distance is 1 mm to 20 mm, especially 1 mm to 10 mm, especially 1 mm to 3 mm. However, other values ​​for this distance may also be provided. This distance is measured particularly in the flow direction 50.

[0181] The pin 73 is pre-tensioned toward the second tool half 72 by a tension force, for example, by a spring not shown. The tension force and the pressure of the material used to manufacture the frame 7 introduced during the casting process steps are coordinated such that the pin 73 is removed from the second tool half 72 against the direction of the tension force through the material used to manufacture the frame 7 during the casting process steps. The material used to manufacture the frame 7 permeates into the space between the second tool half 72 and the pin 73. Here, a blocking element is constructed, particularly a covering section 33, such as... Figure 25As shown in the diagram, the channel opening 74 of the fabric 70 is completely filled, especially with the material not used to manufacture the frame 7.

[0182] Other aspects of the invention are: Aspect A1: A filter element for filtering cooling air used in a handheld work tool 2, wherein the filter element 1 is configured to form part of the outer side 3 of the work tool 2. The filter component 1 is characterized by having a coarse yarn element 4 and a fine yarn element 5. Both the fine yarn element 5 and the coarse yarn element 4 can be filtered by cooling air. The coarse yarn element 4 and the fine yarn element 5 are yarn-shaped. The diameter d1 of the coarse yarn element 4 is larger than the diameter d2 of the fine yarn element 5. The coarse yarn element 4 is used to support the fine yarn element 5.

[0183] Aspect A2: Based on the filtering components of aspect A1, Its features are, - The roving element 4 interweaves itself to form the support fabric 20, and the fine yarn element 5 interweaves itself to form the filter fabric 30. or - The coarse yarn element 4 and the fine yarn element 5 are interwoven together to form a single support filter fabric 40.

[0184] Aspect A3: Based on the filtering components of aspect A1, Its features are, - The coarse yarn element 4 is knitted into the support fabric 20, and the fine yarn element 5 is knitted into the filter fabric 30. or - The coarse yarn element 4 and the fine yarn element 5 are knitted together into a single support filter fabric 40.

[0185] Aspect A4: Based on the filtering components of aspect A2 or A3, The filter fabric 30 is characterized in that it is directly supported on the support fabric 20 during the operation of the filter element 1.

[0186] Aspect A5: A filter element according to one of aspects A2 to A4, The characteristic feature is that the support fabric 20 is arranged in the work apparatus 2 such that it forms part of the outer side 3 of the work apparatus 2, and the filter fabric 30 faces the inner region 6 of the work apparatus 2. or The filter fabric 30 is arranged in the working device 2 such that it forms part of the outer side 3 of the working device 2, and supports the fabric 20 facing the inner area 6 of the working device 2.

[0187] Aspect A6: A filter element according to one of aspects A2 to A5, The filter element is characterized by comprising an additional support fabric 60, and the filter fabric 30 is disposed between the support fabric 20 and the additional support fabric 60.

[0188] Aspect A7: Filtering component according to one of aspects A2 to A6, The characteristic feature is that the width a1 of the support mesh of the support fabric 20 is greater than the width a2 of the filter mesh of the filter fabric 30.

[0189] Aspect A8: A filter element according to one of aspects A2 to A7, The filter element 1 is characterized by having a frame 7 that restricts the structural unit consisting of the filter fabric 30 and the support fabric 20 from both sides with respect to the flow direction 50 of the cooling air, and in particular, the frame 7 is injected around the filter fabric 30 and the support fabric 20 by means of injection molding.

[0190] Aspect A9: According to the filter component of aspect A2, The characteristic feature is that the coarse yarn element 4 and the fine yarn element 5 are interwoven to form a satin fabric.

[0191] Aspect A10: A filter element according to one of aspects A1 to A9, The characteristic feature is that the roving element 4 and / or the fine yarn element 5 are made of metal, especially stainless steel, and especially high-quality steel.

[0192] Aspect A11: A filter element according to one of aspects A1 to A10, The filter member 1 is characterized by having at least two connecting ribs 8, 9, which are arranged on the fine yarn element 5 and / or the coarse yarn element 4 and are provided for arrangement on the outside of the working tool.

[0193] Aspect A12: According to the filtering component of aspect A11, The feature is that at least two connecting ribs 8, 9 surround at least a portion of the roving element 4 and at least a portion of the fine yarn element 5 from both sides with respect to the airflow direction 50 of the cooling air.

[0194] Aspect A13: A handheld working appliance having a filter element according to one of aspects A1 to A12. The feature is that the filter member 1 forms part of the outer side 3 of the working device 2, and through the filter member 1, cooling air can flow from the outside to the inner region 6 of the working device 2 in the flow direction 50.

[0195] Aspect B1: A filter element for filtering cooling air for use in a handheld work tool 2, wherein the filter element 1 includes a frame 7 and a fabric 70, wherein the filter element 1 is configured to be circulated by cooling air in a flow direction 50, wherein the frame 7 surrounds the fabric 70 from both sides about the flow direction 50 and is closedly encircled around the flow direction 50, wherein the fabric 70 has a channel opening 74 that completely penetrates the fabric 70 in the flow direction 50 for threading a pin 73 during the manufacture of the filter element 1. The filter element 1 is characterized by including a blocking member, wherein the blocking member prevents the filter element 1 from being flowed through by cooling air in the region of the channel opening 74 in the flow direction 50.

[0196] Aspect B2: Based on the filtering components of aspect B1, The characteristic feature is that the channel opening 74, especially the edge of the channel opening 74, is surrounded by the material of the frame 7.

[0197] Aspect B3: Based on the filtering components of aspect B1 or B2, The frame 7 is characterized by comprising a circumferential frame 19 and at least one connecting structure 32, the circumferential frame 19 surrounding the edge 78 of the fabric 70, the connecting structure 32 connecting two opposing portions of the circumferential frame 19 to each other, and a channel opening 74 arranged in the area of ​​the connecting structure 32, particularly at a distance from the circumferential frame 19.

[0198] Aspect B4: Based on the filtering components of aspect B3, The characteristic feature is that the channel opening 74 is covered by the connecting structure 32.

[0199] Aspect B5: A filter element according to one of aspects B1 to B4, The feature is that the blocking element is a covering section 33, which covers, in particular, completely covers the channel opening 74.

[0200] Aspect B6: Based on the filtering components of aspect B5, The frame 7 has a frame thickness s1 measured in the flow direction 50 in the region surrounding the channel opening 74, and the covering section 33 has a covering thickness s2 measured in the flow direction 50.

[0201] Aspect B7: Based on the filtering components of aspect B6, The feature is that the coverage thickness s2 is at most 50%, especially at most 20%, especially at most 5% of the frame thickness s1.

[0202] Aspect B8: Based on the filter components of aspect B6 or B7, The feature is that the covering thickness s2 is 0.01 mm to 5 mm, especially 0.05 mm to 2 mm.

[0203] Aspect B9: A filter element according to one of aspects B1 to B8, The feature is that the blocking element is formed of the material of the frame 7.

[0204] Aspect B10: A filter element according to one of aspects B1 to B3, The characteristic feature is that the channel opening 74 is closed by a closing element 76 made of an elastomer, especially a thermoplastic elastomer.

[0205] Aspect B11: A method for manufacturing a filter element 1 for filtering cooling air for use in a handheld work appliance 2, wherein the filter element 1 includes a frame 7 and a fabric 70, wherein the filter element 1 is configured to be circulated by cooling air in a flow direction 50, wherein the frame 7 encloses the fabric 70, wherein, during the manufacture of the filter element 1, the fabric 70 is overlaid and cast between a first tool half 71 and a second tool half 72 in a casting method step, thereby creating the frame 7, wherein the fabric 70 has a channel opening 74, wherein at least one pin 73 is guided through the channel opening 74 during the casting method step to hold the fabric 70 in place. The feature is that the filter member 1 is prevented from being flowed through by cooling air in the channel opening 74 region in the flow direction 50 by providing a blocking member, and in particular, the blocking member is formed by the frame 7.

[0206] Aspect C1: A handheld work tool comprising a base 11 and a filter element 1 for filtering cooling air, wherein the filter element 1 is fastened to the base 11 by means of a fastening element 12 about a fastening direction 49, wherein the filter element 1 has a frame 7, wherein the filter element 1 has a sealing element 77 surrounding along a circumferential direction 48 for sealing between the frame 7 and the base 11, wherein the sealing element 77 is arranged between the frame 7 and the base 11 in the fastening direction 49. The feature is that the working device 2 includes at least one stop element 130 between the base 11 and the frame 7, wherein during the fastening of the filter member 1 to the base 11, the approach of the frame 7 and the base 11 in the fastening direction 49 is limited by the stop element 130.

[0207] Aspect C2: Based on the handheld working tool of aspect C1, The feature is that at least one stop element 130 restricts the deformation of the sealing element 77 in the fastening direction 49.

[0208] Aspect C3: Handheld working tools according to aspect C2, The sealing element 77 has a compression height h2 measured in the fastening direction 49 at the fully compressed portion 132 between the frame 7 and the base 11, and has a sealing element height h1 measured in the same direction at the same compressed portion 132 in the uncompressed state. At least one stop element 130 restricts the compression of the sealing element 77 at the compressed portion 132 in the fastening direction 49 such that the compression height h2 is at least 50%, especially at least 80%, especially at least 90% of the sealing element height h1.

[0209] Aspect C4: A handheld working tool according to one of aspects C1 to C3, The frame 7 is characterized by having a frame edge 17 that surrounds in the circumferential direction 48, and / or the base 11 has a base surface 18 that surrounds in the circumferential direction 48, and at least one stop element 130 protrudes beyond the frame edge 17 and / or beyond the base surface 18 about the fastening direction 49.

[0210] Aspect C5: A handheld working tool according to one of aspects C1 to C4, The feature is that at least one stop element 130 is fixed at the frame 7 or at the base 11, and in particular at least one stop element 130 is constructed in the same material as the frame 7 or the base 11.

[0211] Aspect C6: Hand-held working tools according to one of aspects C1 to C5, The characteristic feature is that the possible distance r between the sealing element 77 and at least one stop element 130, measured in a direction perpendicular to the fastening direction 49, is less than five times, especially three times, especially one time the height h1 of the sealing element.

[0212] Aspect C7: Hand-held working tools according to one of aspects C1 to C6, The feature is that, in order to secure the filter member 1 to the base 11, only a single fastening element 12 is provided, and in particular, the fastening element 12 is arranged at a distance from the edge of the frame 7.

[0213] Aspect C8: A handheld working tool according to one of aspects C1 to C7, The feature is that it is provided with at least two, and more particularly multiple, stop elements 130, which are spaced apart from each other about the circumferential direction 48.

[0214] Aspect D1: A filter element for filtering cooling air for use in a handheld work tool 2, wherein the filter element 1 is configured to form part of the outer side 3 of the work tool 2 and is mounted on the base 11 of the work tool 2, wherein the filter element 1 includes a pointing element 110 for orienting the work tool 2, particularly for orienting the tool 10 of the work tool 2. The filter member 1 is characterized by having a sealing element 77 for abutting against the base 11 of the handheld work tool 2 and for sealing between the filter member 1 and the base 11, and the probing element 110 and the sealing element 77 are constructed of the same material.

[0215] Aspect D2: Based on the filtering components of aspect D1, The feature is that the probing element 110 and the sealing element 77 are integrally constructed as a probing and sealing element 111.

[0216] Aspect D3: Based on the filtering components of aspect D1 or D2, Its characteristic is that not only the probing element 110 but also the sealing element 77 are made of thermoplastic elastomer.

[0217] Aspect D4: A filter element based on one of aspects D1 to D3. The filter member 1 is characterized in that it has an inner side 14 facing the substrate 11 in the installation position of the filter member 1 and an outer side 15 away from the substrate 11 in the installation position of the filter member 1. The filter member 1 has at least one flow-through opening 16, especially at least two flow-through openings 16, particularly four flow-through openings 16. At least one flow-through opening 16 completely penetrates the filter member from the inner side 14 to the outer side 15, and the probing and sealing element 111 extends through at least one flow-through opening 16.

[0218] Aspect D5: A filter element based on one of aspects D1 to D4. The filter member 1 is characterized by having a frame 7, which has a channel 80 for accommodating a sealing element 77 at an inner side 14 of the filter member 1, and a probe element channel 114 for accommodating a probe element 110 at an outer side 15 of the filter member 1.

[0219] Aspect D6: Based on the filtering components of aspects D4 and D5, The feature is that at least one flow-through opening 16 connects the channel 80 and the probing element channel 114 to each other.

[0220] Aspect D7: Filtering component according to one of aspects D1 to D6, The feature is that the frame 7 and the probing element 110 are contrasting in color.

[0221] Aspect D8: A filter element based on one of aspects D1 to D7, The feature is that the probing element 110 is arranged on the outer side 15 of the filter member 1.

[0222] Aspect D9: Handheld work tool, which includes a filter element 1 according to one of aspects D1 to D8.

[0223] Aspect D10: A handheld work tool having a filter element according to aspect D8, The tool 2 is characterized in that it includes a tool 10 having a longitudinal extension, a probing element 110 having a piercing bar 112 and / or a cutting bar 113, wherein the piercing bar 112 extends substantially in the direction of the longitudinal extension in the installed position, and / or the cutting bar 113 extends in a direction transverse to, and especially perpendicular to, the longitudinal extension.

[0224] Aspect D11: Based on the handheld working tool of aspect D10, The feature is that the piercing strip 112 and the felling strip 113 are arranged such that they appear to be separated from each other by the covering.

[0225] Aspect D12: A method for manufacturing a filter element 1 for filtering cooling air for use in a handheld work tool 2, wherein the filter element 1 is configured to form part of the outer side 3 of the work tool 2 and is mounted on the base 11 of the work tool 2, wherein the filter element 1 includes a pointing element 110 for orienting the work tool 2, particularly for orienting the tool 10 of the work tool 2. The filter member 1 is characterized by having a sealing element 77 for abutting against the base 11 of the handheld work tool 2 and for sealing between the filter member 1 and the base 11, and the probing element 110 and the sealing element 77 are cast in a single casting process step, and the probing and sealing element 111 are particularly integral in this configuration.

Claims

1. A handheld work tool having a filter element (1) for filtering cooling air for use in the handheld work tool (2), wherein, The filter element (1) forms part of the outer side (3) of the working device (2), wherein, through the filter element (1), cooling air can flow from the outside into the inner region (6) of the working device (2) in the flow direction (50). The filter element (1) is characterized in that it has a coarse yarn element (4) and a fine yarn element (5), and both the fine yarn element (5) and the coarse yarn element (4) are capable of passing through the cooling air to filter the cooling air. The coarse yarn element (4) and the fine yarn element (5) are respectively yarn-shaped. The diameter (d1) of the coarse yarn element (4) is larger than the diameter (d2) of the fine yarn element (5), and the coarse yarn element (4) is used to support the fine yarn element (5).

2. The working tool according to claim 1, Its features are, - The roving elements (4) themselves interweave to form a support fabric (20), and the fine yarn elements (5) themselves interweave to form a filter fabric (30). or - The coarse yarn element (4) and the fine yarn element (5) are interwoven together to form a single support filter fabric (40).

3. The working tool according to claim 1, Its features are, - The roving element (4) is knitted into a support fabric (20), and the fine yarn element (5) is knitted into a filter fabric (30). or - The roving element (4) and the fine yarn element (5) are knitted together into a single support filter fabric (40).

4. The working tool according to claim 2 or 3, Its features are, The filter fabric (30) is supported on the support fabric (20) during the operation of the filter element (1).

5. The working tool according to claim 2 or 3, Its features are, The filter fabric (30) is arranged in the working device (2) such that it forms part of the outer side (3) of the working device (2), and the support fabric (20) faces the inner region (6) of the working device (2).

6. The working tool according to claim 2 or 3, Its features are, The filter element includes an additional support fabric (60), and the filter fabric (30) is arranged between the support fabric (20) and the additional support fabric (60).

7. The working tool according to claim 2 or 3, Its features are, The width (a1) of the support mesh of the support fabric (20) is greater than the width (a2) of the filter mesh of the filter fabric (30).

8. The working tool according to claim 2 or 3, Its features are, The roving element (4) and / or the fine yarn element (5) are made of metal.

9. A filter element for filtering cooling air used in a handheld work tool (2), wherein, The filter element (1) includes a frame (7) and a fabric (70), wherein the filter element (1) is configured to be circulated by cooled air in the flow direction (50), wherein the frame (7) surrounds the fabric (70) from both sides about the flow direction (50) and is closed around the flow direction (50), wherein the fabric (70) has a channel opening (74) that completely penetrates the fabric (70) in the flow direction (50) for inserting a pin (73) during the manufacture of the filter element (1). The filter element (1) is characterized in that it includes a blocking member, and the blocking member prevents the filter element (1) from being circulated by cooling air in the region of the channel opening (74) in the flow direction (50).

10. The filter element according to claim 9, Its features are, The channel opening (74) is surrounded by the material of the frame (7), and / or the channel opening (74) is closed by a closing element (76) made of an elastomer.

11. A filter element for filtering cooling air used in a handheld work tool (2), wherein, The filter member (1) is configured to form part of the outer side (3) of the working tool (2) and is mounted on the base (11) of the working tool (2), wherein the filter member (1) includes a directional element (110) for orienting the working tool (2). The filter member (1) is characterized in that it has a sealing element (77) for abutting against the base (11) of the handheld work tool (2) and for sealing between the filter member (1) and the base (11), and the probing element (110) and the sealing element (77) are constructed of the same material.

12. The filter element according to claim 11, Its features are, The probing element (110) and the sealing element (77) are integrally constructed as a probing and sealing element (111).

13. The filter element according to claim 11, Its features are, Not only the probing element (110) but also the sealing element (77) is made of thermoplastic elastomer.

14. The filter element according to claim 11, Its features are, The filter member (1) has an inner side (14) facing the substrate (11) in the installation position of the filter member (1) and an outer side (15) away from the substrate (11) in the installation position of the filter member (1), the filter member (1) having at least one flow-through opening (16) that completely penetrates the filter member from the inner side (14) to the outer side (15), and the probing and sealing element (111) extends through the at least one flow-through opening (16).

15. A handheld working tool having a filter element according to claim 11, characterized in that, The working tool (2) includes a tool (10) having a longitudinal extension, the probing element (110) having a piercing bar (112) and / or a cutting bar (113), wherein the piercing bar (112) extends substantially in the direction of the longitudinal extension in the installed position, and / or the cutting bar (113) extends in a direction transverse to the longitudinal extension.

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