Material collecting device, support element, cover unit and machine tool

Abstract

The invention relates to a material collecting device (10) for a machine tool (12), in particular for a grinding machine, having at least one filter element (14), having a support element (16) arranged in the filter element (14) in the mounted state for tensioning the filter element (14), and having a filter protective jacket (18), in particular of rigid design, the filter element (14.) is arranged in the filter protective jacket (18) in the mounted state, and wherein the filter element (14.) is arranged in the filter protective jacket (18) in the mounted state. The invention further relates to a corresponding support element (16), a corresponding cover unit (36) and a corresponding machine tool (12).

Description

Technical Field

[0001] The invention relates to a material collecting device for a machine tool, a supporting element, a cover unit and a machine tool. Background Art

[0002] Various material collecting devices for machine tools have already been proposed. Summary of the invention

[0003] A material collecting device for a machine tool, in particular a grinding machine, is proposed, the machine tool having at least one filter element, a supporting element arranged in the filter element in the installed state for tensioning the filter element, and a filter protective sleeve of an especially rigid construction, the filter protective sleeve having at least one air outlet, wherein the filter element is arranged in the filter protective sleeve in the installed state.

[0004] The configuration of the material collecting device according to the invention can achieve a particularly high degree of protection of the filter element. A particularly long-lived material collecting device can be provided. Advantageously, a particularly high degree of shape stability of the filter element can be achieved. Advantageously, dust can be prevented from adhering to the filter material particularly effectively. Advantageously, clogging of the filter can be prevented. Particularly effective filtering can be achieved. The filter element can be cleaned by knocking on the filter protection sleeve. Advantageously, the filter can be cleaned particularly easily and / or effectively. A particularly high degree of operating comfort can be achieved.

[0005] The material collecting device is particularly designed to collect material that is mechanically separated and / or removed from a workpiece by a machine tool. The material can be designed in particular as dust, chips, wear, etc. "Provided" is to be understood in particular as being specially set up, specially programmed, specially designed and / or specially equipped. "An object is provided for a specific function" is to be understood in particular as meaning that the object fulfills and / or performs this specific function in at least one application state and / or operating state.

[0006] The power tool is preferably designed as a handheld power tool, in particular as a grinder, preferably as an oscillating grinder or eccentric grinder, as a jigsaw, an oscillating saw, a drilling machine, a milling machine, a circular saw, a cut-off grinder or as another power tool suitable for a person skilled in the art. The power tool can preferably be held with one or two hands, in particular without a transport device and / or a holding device, and can be guided and operated by hand, in particular during workpiece processing.

[0007] The filter protection sleeve is preferably configured as a column, in particular a cylindrical shape, or as a hexagonal, truncated cone, truncated pyramid or similar shape. The filter protection sleeve preferably has a plurality of air outlets. Preferably, the air outlets have different sizes at least in part. Preferably, the side wall of the filter protection sleeve has at least a part of the air outlet. It is also conceivable that at least the air outlets on the side wall have the same size. The filter protection sleeve is particularly configured as a material collection container, preferably for collecting materials filtered by means of the filter element.

[0008] The support element is particularly configured to correspond to the filter protective sleeve. Preferably, the support element is configured to be cylindrical, particularly cylindrical, or to be configured to be hexagonal, truncated cone, truncated pyramid, etc. The support element is preferably configured to tension the filter element in a state mounted on the support element, preferably at least predominantly tensioned without wrinkles.

[0009] The filter element is preferably arranged to filter the material that is preferably mechanically separated and / or removed from the workpiece by the machine tool from the air flow passing through the filter element. The filter element is particularly configured to be air-permeable. The filter element is particularly configured to be different from a pleated filter. Preferably, the filter element is configured as a pleated filter. The filter element can be composed of, for example, lint, cellulose, glass fibers, quartz fibers, nonwovens, combinations of these materials or other materials that are reasonable to those skilled in the art.

[0010] The filter element is preferably fixed on the support element. The support element has a fixing unit for fixing the filter element in particular. Preferably, the filter element is preferably fixed on the support element detachably, especially without tools, by means of the fixing unit. In this article, "detachable" should be understood as "can be separated without destruction". The filter element can be fixed on the support element in a non-lost manner by means of a fixing unit of the support element, for example, by a latch connection, a threaded connection, a clamping connection, etc. The fixing unit of the support element, for example, includes a retaining element, preferably a clamping ring, in particular made of metal, plastic or the like, preferably made of an elastic material. The support element matrix of the support element has a receiving portion for receiving the retaining element in particular. The retaining element is preferably arranged in the receiving portion in the installed state. The retaining element is particularly configured to cooperate with the filter element and the receiving portion of the support element matrix to fix the filter element on the support element. The filter element is, for example, wound around the retaining element. It is also conceivable that the retaining element is constructed integrally with the filter element. "Integral" can be understood as at least a material-locked connection, for example by a welding process, a brazing process, an adhesive process, an injection process and / or other processes that a person skilled in the art considers reasonable, and / or as advantageously formed into a single piece, for example by a casting and / or by a single or multi-component injection process and advantageously from a single blank.

[0011] Preferably, the filter element is at least substantially completely surrounded by the filter protective sleeve in the installed state, as seen in the radial direction. In particular, the filter element is completely surrounded by the filter protective sleeve in the installed state, as seen in the radial direction, except for at least one air outlet. "At least substantially completely" is to be understood as meaning at least 50%, preferably at least 75%, particularly preferably at least 90% of the total volume and / or total mass of the object.

[0012] It is further proposed that the filter protection sleeve has a fixing unit for arranging the filter element in a captive manner in the filter protection sleeve. Damage to the filter element due to the filter element accidentally falling out of the filter protection sleeve can be advantageously resisted. Advantageously, a material collection device with a particularly low risk of damage can be provided. A material collection device with particularly high user comfort can be provided. The filter element is preferably arranged on the filter protection sleeve in a removable manner, preferably in a tool-free manner, preferably by means of a fixing unit of the filter protection sleeve. In particular, the support element is captively arranged in the filter protection sleeve by means of the fixing unit of the filter protection sleeve. Preferably, the fixing unit of the filter protection sleeve is arranged for cooperating with the support element so that the filter element is captively arranged in the filter protection sleeve. Alternatively or additionally, it is conceivable that the fixing unit of the filter protection sleeve is configured for directly cooperating with the filter element so that the filter element is captively arranged in the filter protection sleeve. The filter element can be captively arranged in the filter protection sleeve by means of the fixing unit of the filter protection sleeve, for example, by a latch connection, a threaded connection, a clamping connection or the like. Preferably, the fixing unit of the filter protection sleeve has a thread, in particular an internal thread. Preferably, the support element has a mounting interface for fixing on the filter protective sleeve, in particular in the filter protective sleeve. The mounting interface of the support element is particularly configured to cooperate with a fixing unit of the filter protective sleeve so that the filter element and / or the support element are captively arranged on the filter protective sleeve, preferably in the filter protective sleeve. The mounting interface of the support element is preferably configured to correspond to the fixing unit of the filter protective sleeve. The mounting interface of the support element preferably has a thread, in particular an external thread. The thread of the mounting interface of the support element is particularly configured to cooperate with a thread of the fixing unit of the filter protective sleeve so that the filter element and / or the support element are captively arranged in the filter protective sleeve.

[0013] It is further proposed that the support element is rigidly constructed at least in the longitudinal direction. Advantageously, deformations of the filter element, in particular deformations under negative pressure, can be counteracted in a structurally simple and / or effective manner. A material collecting device with a particularly dimensionally stable arrangement of filter elements can be realized. The formation of folds in the filter element can be counteracted particularly effectively and / or in a structurally simple manner. Advantageously, a filter element with particularly high reliability can be provided. The support element is particularly constructed so that the support element is free of deformation in the longitudinal direction in the operating state.

[0014] In addition, it is proposed that the support element has at least one support bar, which is configured to taper in the radial direction, especially with respect to the main extension axis of the support element. The contact surface between the filter element and the support element can be advantageously kept particularly small. A supported filter element with a particularly large effective filter surface can be provided. Advantageously, a filter element with particularly high efficiency can be realized. In particular, the support element has a plurality of support bars, such as two, three, four, five, six or more than six support bars. The support bars are preferably evenly arranged on the circumference extending in a plane perpendicular to the longitudinal direction and / or the main extension axis of the support element. The main extension axis of the at least one support bar extends at least substantially parallel to the longitudinal direction and / or the main extension axis of the support element. The "main extension axis" of an object can be particularly understood as an axis extending parallel to the longest edge of the smallest geometric cuboid that just completely surrounds the object and particularly through the center of the cuboid. "Substantially parallel" is understood here to mean an orientation of a direction relative to a reference direction, in particular in a plane, wherein the direction has a deviation relative to the reference direction of in particular less than 8°, advantageously less than 5°, particularly advantageously less than 2°. The main extension axis of the support element is preferably at least substantially parallel to the longitudinal extension of the support element. The at least one support strip tapers, in particular in radial direction relative to its main extension axis, preferably on both sides.

[0015] It is further proposed that the filter protective sleeve has at least one air guiding element configured as a recess. Particularly effective air guiding can be advantageously achieved. A filter element with particularly effective filtering can advantageously be provided. Preferably, the air guiding element is arranged to guide the air flow to at least one air outlet of the filter protective sleeve. Preferably, the inner wall of the filter protective sleeve has the air guiding element. Alternatively or additionally, it is also conceivable that the filter protective sleeve has at least one air guiding element configured as a protrusion. It is conceivable that the air guiding element is connected to the at least one air outlet. However, it is also conceivable that the air guiding element is arranged to be spaced apart from the at least one air outlet.

[0016] It is further proposed that at least the majority of the filter element is arranged to be spaced apart from the filter protective sleeve when the filter element is arranged in the filter protective sleeve. Advantageously, the airflow through the filter element can be particularly effectively guided to the at least one air outlet. Advantageously, a material collection device with particularly effective filtration can be provided. The expression "majority" is to be understood in particular as a volume share and / or mass share of at least 55%, preferably at least 65%, preferably at least 75%, particularly preferably at least 85%, very particularly preferably at most 95%. It is also conceivable that the entire filter element is arranged to be spaced apart from the filter element protective sleeve when the filter element is arranged in the filter protective sleeve.

[0017] It is further proposed that the support element is movable and / or deformable relative to the filter protective sleeve in the installed state for generating impacts. Advantageously, particularly effective cleaning of the material collecting device can be achieved. The adhesion of dust to the filter element can be particularly simple in structure and / or effectively resisted. A particularly effective utilization of the filter element can be supported. Preferably, the support element has a free end in a state fixed in the filter protective sleeve. The free end is preferably arranged to be spaced apart from the filter protective sleeve, in particular at least in a state where the support element is not loaded. Preferably, the free end can be moved relative to the filter protective sleeve, for example by shaking the filter protective sleeve. In particular, the free end can be moved relative to the filter protective sleeve in such a way that a part of the filter element arranged at the free end of the support element stops on the filter protective sleeve. Preferably, the support element is constructed to be deflectable in a radial direction, preferably elastically.

[0018] It is further proposed that the filter element has a dustproof coating. Advantageously, the adhesion of dust and the like to the filter element can be particularly effectively resisted. The filter element can be effectively utilized in a particularly durable manner. A particularly high level of user comfort can be achieved. Preferably, the filter element has a dustproof coating at least on the inside. The dustproof coating can be, for example, a polytetrafluoroethylene coating, a polyetheretherketone coating, a polymethyl nitrogen coating, a nanofiber coating, a combination of these, etc. The dustproof coating is particularly designed to resist the adhesion of dust and the like.

[0019] The invention further relates to an in particular aforementioned support element for fixing a filter element in an in particular aforementioned material collecting device of an in particular aforementioned machine tool, having a fixing unit for fixing the filter element. It is proposed that the support element has an in particular aforementioned mounting interface for fixing to an in particular aforementioned filter protective sleeve, in particular in the filter protective sleeve. Damage to the filter element arranged on the support element due to accidental detachment of the filter element from the filter protective sleeve can be advantageously prevented.

[0020] In addition, a cover unit for the material collection device mentioned above, especially for the machine tool mentioned above, is proposed, and the cover unit has a fixing unit and a mounting interface, the fixing unit is used to fix the support element mentioned above, especially for the filter element mentioned above, and the mounting interface is used to fix the filter protection sleeve mentioned above. The fixing unit of the cover unit is particularly configured to preferably additionally fasten the support element to the filter protection sleeve. The fixing unit of the cover unit is configured as a stop element here by way of example. The stop element preferably abuts against the support element at least in the operating state. The stop element is particularly configured to fasten the support element to the filter protection sleeve in the axial direction, especially additionally. However, it is also conceivable that the support element can be fixed on the cover unit and / or fastened on the filter protection sleeve by means of the fixing unit of the cover unit through threaded connection, latch connection, clamping connection, etc. With the mounting interface of the cover unit, the cover unit is fixed on the filter protection sleeve, for example, by threaded connection, latch connection, clamping connection, etc. The mounting interface of the cover unit is preferably configured to correspond to the fixing unit of the filter protection sleeve. Preferably, the mounting interface of the cover unit has a thread, preferably an external thread, which is arranged to cooperate with the thread of the filter protective sleeve, in particular for fixing the cover unit on the filter protective sleeve. The cover unit has a machine tool interface for fixing on a machine tool, in particular on a ejection short pipe of the machine tool. The cover unit preferably has another mounting interface for detachably fixing the material removal unit, in particular detachably fixing the material removal unit without tools. The other mounting interface is preferably arranged to fix the material removal unit to the cover unit instead of the filter protective sleeve. The material removal unit is, for example, a material collection container, which has at least one corresponding interface compatible with the other mounting interface of the cover unit, in particular replacing a corresponding interface compatible with the mounting interface of the cover unit. The corresponding interface "compatible" with the interface is preferably understood as a corresponding interface compatible with the functional requirements, which cooperates with the aforementioned interface so that the two components can be fixed to each other in a loadable manner, in particular at least in terms of the dead weight of the components. The material removal unit can, for example, comprise a hose, in particular at least one hose nipple, and can be designed in particular as a vacuum cleaner, which has a corresponding interface compatible with the further mounting interface, in particular replacing the corresponding interface compatible with the aforementioned mounting interface. The cover unit is preferably configured for rigid connection of the machine tool to the filter protection sleeve or the material removal unit, in particular at least one hose of the material removal unit, in particular for automatically carrying the filter protection sleeve or the material removal unit, in particular at least one hose of the material removal unit, when the machine tool is moved. The cover unit is preferably configured for guiding material along a set flight path from the machine tool, in particular the ejection nipple, which is fixed to the cover unit by means of the machine tool interface, to the filter protection sleeve fixed to the cover unit by means of the mounting interface of the cover unit, or to the material removal unit fixed by means of the further mounting interface of the cover unit.The cover unit preferably includes an inlet opening and an outlet opening along the set trajectory, the inlet opening is used to receive material from the machine tool, and the outlet opening is used to discharge the material from the cover unit, especially into the filter protective sleeve or the material removal unit. The cover unit preferably includes an especially annular central wall, which limits the outlet opening. The cover unit preferably includes an outlet center axis, which is perpendicular to the main extension plane of the central wall. The outlet center axis preferably passes through the geometric center of gravity of the central wall. The "main extension plane" of the structural unit should be understood in particular as a plane that is parallel to the largest side of the smallest imaginary cuboid that just completely surrounds the structural unit and extends in particular through the center of the cuboid. The cover unit preferably includes at least one fastening wall section arranged on the central wall, and the mounting interface of the cover unit is arranged on the fastening wall section. The fastening wall section is preferably substantially closed in the circumferential direction. The cover unit preferably includes at least one fastening wall section or another fastening wall section, which is especially mentioned and arranged on the central wall, and the other mounting interface is arranged on the fastening wall section. The cover unit preferably includes at least one wall section arranged on the central wall and on the machine tool side, and the machine tool interface is arranged on the wall section on the machine tool side. At least one fastening wall section, in particular all fastening wall sections and wall sections on the machine tool side are preferably arranged on different sides of the central wall relative to the outlet center axis. The cover unit has an opening plane, which preferably extends perpendicular to the outlet center axis. The opening plane preferably limits the axial extension of the fastening wall section, in particular the other fastening wall section, on which the other mounting interface is arranged. The cover unit preferably has another fastening wall section that is substantially closed in the circumferential direction, in particular as mentioned above. The other fastening wall section forms an air bypass in particular. The air bypass is preferably composed of a notch of the other fastening wall section that is different from the other mounting interface. The air bypass preferably has a minimum angular spacing of greater than 15°, preferably greater than 30°, and particularly preferably greater than 45° relative to the other mounting interface in a plane perpendicular to the outlet center axis with the outlet center axis as the vertex. The air bypass has a minimum angular spacing of less than 165°, preferably less than 150°, and particularly preferably less than 135° relative to the other mounting interface, with the outlet center axis as the vertex, in particular in a plane perpendicular to the outlet center axis. The air bypass and at least a larger part of the machine tool interface or the entire machine tool interface are preferably arranged in different halves of the cover unit with respect to at least one section including the outlet center axis. The air bypass is preferably formed by at least one, particularly preferably exactly one, slit-shaped air bypass slot in the fastening wall section, in particular the other fastening wall section. The air bypass slot preferably extends from the opening plane of the cover unit at least substantially parallel to the outlet center axis. Particularly preferably, the maximum longitudinal extension of the air bypass slot parallel to the outlet center axis is greater than the maximum opening width of the air bypass slot in a plane perpendicular to the outlet center axis.Particularly preferably, the maximum longitudinal extension of the air bypass slot parallel to the outlet center axis extends over at least a significant portion of the maximum longitudinal extension of the fastening wall section, in particular parallel thereto. A "significant portion" of the reference variable is preferably to be understood as at least 25%, preferably at least 33%, particularly preferably at least 50% of the reference variable. The air bypass slot preferably has an opening width of less than 60°, preferably less than 45°, particularly preferably less than 35° relative to the outlet center axis in a plane perpendicular to the outlet center axis. The air bypass preferably has an opening width of more than 25°, preferably more than 20°, particularly preferably more than 15° relative to the outlet center axis in a plane perpendicular to the outlet center axis.

[0021] Furthermore, a machine tool, in particular a hand-held machine tool, preferably a grinding machine, is proposed, which has a material collecting device, in particular a material collecting device, in particular a material collecting element, and / or a cover unit. Advantageously, the removed material produced by the machine tool can be sucked away particularly effectively and / or reliably. Advantageously, a particularly high level of user comfort can be achieved.

[0022] The material collecting device according to the invention, the supporting element according to the invention, the cover unit according to the invention and / or the machine tool according to the invention are not to be restricted to the above-described applications and embodiments. In particular, the material collecting device according to the invention, the supporting element according to the invention, the cover unit according to the invention and / or the machine tool according to the invention may have a number of individual elements, components and units that differs from the number described herein in order to realize the functional principle described herein. Furthermore, for the value ranges specified in the present disclosure, it is to be understood that the values ​​within the stated boundaries are also disclosed and can be used arbitrarily. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Further advantages are derived from the following description of the drawings. An embodiment of the present invention is shown in the drawings. The drawings, the description and the summarized technical solution contain a large number of combinations of features. Those skilled in the art can also consider these features individually according to the purpose and summarize them into other reasonable combinations. The drawings show:

[0024] Figure 1 is a schematic top view of a machine tool according to the invention having a material collecting device according to the invention,

[0025] Figure 2 is a side view of the material collecting device,

[0026] Figure 3 is a cross-sectional view of the material collecting device,

[0027] Figure 4 is another cross-sectional view of the material collecting device,

[0028] Figure 5 is a cross-sectional view of the filter protective cover of the material collection device,

[0029] Figure 6 is a perspective view of a supporting element according to the invention of the material receiving device,

[0030] Figure 7 is a side view of a cover unit according to the invention of the material collecting device, and

[0031] Figure 8 is a perspective view of the cover unit. DETAILED DESCRIPTION

[0032] Figure 1 A machine tool 12 with a material collecting device 10 is shown. The machine tool 12 is designed as a handheld machine tool. The machine tool 12 is designed here as a grinder, in particular as an eccentric grinder or an oscillating grinder. Alternatively, it is conceivable that the machine tool 12 is designed as a jigsaw, an oscillating saw, a drilling machine, a milling machine, a circular saw, a cutting grinder or other machine tools 12 that are reasonable for a person skilled in the art. The machine tool 12 is held with one or two hands, in particular without a transport device and / or a holding device, and can be guided and operated by hand, in particular during workpiece processing.

[0033] The material collecting device 10 is provided for collecting material which is mechanically separated and / or removed from a workpiece by a machine tool 12. The material can be in the form of dust, shavings, removals or the like.

[0034] The material collecting device 10 has one filter element 14 . Alternatively, however, it is also conceivable that the material receiving device 10 has more than one filter element 14 , for example two filter elements 14 , three filter elements 14 or more than three filter units 14 .

[0035] The filter element 14 is provided for filtering the material mechanically separated and / or removed from the workpiece by the machine tool 12 from the air flow guided through the filter element 14. The filter element 14 is air-permeable. The filter element 14 is constructed differently from a pleated filter. The filter element 14 is constructed as a pleated filter. The filter element 14 can be, for example, made of lint, cellulose, glass fiber, quartz fiber, nonwoven fabric, a combination of these materials or other materials that are reasonable to a technician.

[0036] The material collecting device 10 has a support element 16 for tensioning the filter element 14. In the installed state, the support element 16 is arranged inside the filter element 14. The filter element 14 can be fixed to the support element 16. The support element 16 has a fixing unit 38 for fixing the filter element 14. The filter element 14 can be removably fixed to the support element 16, in particular removably without tools, preferably by means of the fixing unit 38. The support element 16 is provided for tensioning the filter element 14 in the installed state on the support element 16, preferably at least predominantly without folds.

[0037] The fixing unit 38 of the support element 16 comprises a retaining element, preferably a clamping ring 96, which is particularly made of metal, plastic or the like, preferably made of an elastic material. The support element base 100 of the support element 16 has a receiving portion 98 for receiving the retaining element. In the installed state, the retaining element is arranged in the receiving portion. The retaining element is arranged to cooperate with the receiving portion 98 of the filter element 14 and the support element base 100 to fix the filter element 14 to the support element 16. The filter element 14 is wound around the retaining element at one end. It is also conceivable that the retaining element is integrally constructed with the filter element 14. However, it is also conceivable that the filter element 14 can be fixed to the support element 16 by means of the fixing unit 38 of the support element 16, for example, by a latch connection, a threaded connection or a similar connection to prevent loss.

[0038] The material collecting device 10 has a filter protection sleeve 18. The filter protection sleeve 18 is cylindrical, in particular circular cylindrical. Alternatively, it is conceivable that the filter protection sleeve 18 is hexagonal, truncated cone, truncated pyramid or the like.

[0039] The filter protective sleeve 18 is of rigid design. The filter protective sleeve 18 has a plurality of air outlets 20. Alternatively, however, it is also conceivable that the filter protective sleeve 18 has only one air outlet 20 or a number of air outlets different from the number of air outlets 20 shown.

[0040] The air outlet 20 is arranged in the side wall 54 of the filter protection sleeve 18. The side wall 54 has two sections, which have air outlets 20 of different sizes. Alternatively, it is also conceivable that the air outlets 20 on the side wall 54 have the same size, or that the side wall 54 has more than two sections with air outlets 20a of different sizes. Preferably, the section of the two sections that has an air outlet 20 that is smaller than the air outlet 20 of the other section is arranged in the longitudinal direction 24 between the fixing unit 22 and the other section. The filter protection sleeve 18 has at least one additional air outlet 52. The additional air outlet 52 is arranged at the axial end 56 of the filter protection sleeve 18.

[0041] The support element 16 is designed to correspond to the filter protection sleeve 18. The support element 16 is designed to be cylindrical, in particular cylindrical. Alternatively, it is conceivable that the support element 16 is designed to be hexagonal, truncated cone, truncated pyramid or the like.

[0042] The filter element 14 is arranged in the installed state in the filter protective sheath 18. The filter element 14 is at least substantially completely surrounded by the filter protective sheath 18 in the installed state, as seen in the radial direction. The filter element 14 is completely surrounded by the filter protective sheath 18 in the installed state, as seen in the radial direction, except for the air outlet 20.

[0043] The filter protective sleeve 18 has a fixing unit 22 for captively arranging the filter element 14 in the filter protective sleeve 18. The fixing unit 22 is arranged at the other axial end 58 of the filter protective sleeve 18. In particular, viewed along the main extension axis 60 of the filter protective sleeve 18, the other axial end 58 is arranged on the side of the filter protective sleeve 18 facing away from the axial end.

[0044] The filter element 14 can be removably fixed to the filter protective sleeve 18, preferably removably fixed without tools, in particular by means of a fixing unit 22 of the filter protective sleeve 18. The support element 16 can be captively arranged in the filter protective sleeve 18 by means of the fixing unit 22 of the filter protective sleeve 18. The fixing unit 22 of the filter protective sleeve 18 is provided for cooperating with the support element 16 in order to captively arrange the filter element 14 in the filter protective sleeve 18. Alternatively or additionally, it is conceivable that the fixing unit 22 of the filter protective sleeve is designed for directly cooperating with the filter element 14 in order to captively arrange the filter element 14 in the filter protective sleeve 18.

[0045] The filter element 14 is arranged in a captive manner in the filter protective sleeve 18 by means of a fixing unit 22 of the filter protective sleeve 18 via a screw connection (see Figure 3 ). However, it is also conceivable that the filter element 14 can be arranged in a captive manner in the filter protection sleeve 18 by means of the fixing unit 22 by means of a latching connection, a screw connection, a clamping connection or the like. The fixing unit 22 of the filter protection sleeve 18 has a thread 42, in particular an internal thread.

[0046] The support element 16 has a mounting interface 40 for fixing on the filter protection sleeve 18, in particular, fixing in the filter protection sleeve 18. The mounting interface 40 of the support element 16 is configured to cooperate with the fixing unit 22 of the filter protection sleeve 18 so that the filter element 14 and / or the support element 16 are captively arranged on the filter protection sleeve 18, preferably in the filter protection sleeve 18. The mounting interface 40 of the support element 16 is configured to correspond to the fixing unit 22 of the filter protection sleeve 18. The mounting interface 40 of the support element 16 has a thread 44, in particular an external thread. The thread 44 of the mounting interface 40 of the support element 16 is configured to cooperate with the thread 42 of the fixing unit 22 of the filter protection sleeve 18 so that the filter element 14 and / or the support element 16 are captively arranged in the filter protection sleeve 18.

[0047] The support element 16 has, by way of example, six support strips 26 (see Figure 6 ). However, it is also conceivable that the support element 16 has a number of support strips 26 other than six, for example one support strip 26, two support strips 26, three support strips 26, four support strips 26, five support strips 26 or more than six support strips 26. In particular, the support strips 26 taper in the respective radial direction relative to the main extension axis 46 of the support element 16. The support strips 26 taper laterally, preferably on both sides, in the radial direction relative to their respective main extension axis 48.

[0048] The main extension axis 46 of the support element 16 extends, at least in the installed state of the support element 16 , at least substantially parallel to the main extension axis 60 of the filter protection bellows 18 .

[0049] The support strips 26 are arranged uniformly in a circumferential direction, in particular in a plane extending perpendicularly to the longitudinal direction 24 and / or the main extension axis 46 of the support element 16. The main extension axis 48 of each support strip 26 (in Figure 4 The main extension axis 48 of only one of the support strips 26 is provided with a reference numeral) extends at least substantially parallel to the longitudinal direction 24 and / or the main extension axis 46 of the support element 16. The main extension axis 46 of the support element 16 extends at least substantially parallel to the longitudinal direction 24 of the support element 16.

[0050] The support element 16 is rigid at least in the longitudinal direction 24 (see Figure 5 The support element 16 is designed such that the support element 16 is not deformed in the longitudinal direction 24 in the operating state.

[0051] The filter protection sleeve 18 has an air guiding element 28 designed as a depression (in Figure 5Only one air guide element 28 has a reference number. The air guide element 28 is provided for guiding the air flow to the air outlet 20 of the filter protective sleeve 18. The inner wall 50 of the filter protective sleeve 18 has an air guide element 28 designed as a recess. Alternatively or additionally, it is also conceivable that the filter protective sleeve 18 has at least one air guide element 28 designed as a protrusion.

[0052] At least a majority of the filter element 14 is arranged spaced apart from the filter protective sheath 18 when the filter element 14 is arranged in the filter protective sheath 18. In particular, the entire filter element 14 is spaced apart from the filter protective sheath 18 when the filter element 14 is arranged in the filter protective sheath 18.

[0053] The support element 16 is movable and / or deformable relative to the filter protection sleeve 18 in the installed state to generate an impact. The support element 16 has a free end 62 when it is fixed in the filter protection sleeve 18. The free end 62 is arranged to be spaced apart from the filter protection sleeve 18, in particular, at least in the unloaded state of the support element 16. The free end 62 can move relative to the filter protection sleeve 18, for example, by shaking the filter protection sleeve 18. The free end 62 can move relative to the filter protection sleeve 18 in such a way that the part of the filter element 14 arranged on the free end 62 of the support element 16 stops on the filter protection sleeve 18. The support element 16 is preferably elastically deflectable in the radial direction. The filter element 14 has a protruding portion relative to the free end 62. However, it is also conceivable that the filter element 14 is arranged to not protrude relative to the free end 62.

[0054] The filter element 14 has a dustproof coating 30. The filter element 14 has a dustproof coating 30 at least on the inner side. The dustproof coating 30 can be, for example, a polytetrafluoroethylene coating, a polyetheretherketone coating, a polymethyl nitrogen coating, a nanofiber coating, or a combination of these. The dustproof coating 30 is provided to resist dust or the like from being fixed on the filter element 14.

[0055] The material collecting device 10 has a cover unit 36. The cover unit 36 ​​has a fixing unit 32 for fixing the support element 16. The fixing unit 32 is designed here as a stop element by way of example. The stop element preferably abuts against the support element 16 at least in the operating state and is particularly provided for fastening the support element 16, in particular additionally, axially to the filter protection sleeve 18.

[0056] The cover unit 36 ​​has a mounting interface 34 for fixing the filter protection sleeve 18. The mounting interface 34 is configured as a thread, in particular an external thread, in this example. The mounting interface 34 is provided for cooperating with the fixing unit 22 of the filter protection sleeve, preferably with the thread 42, to fix the cover unit 36 ​​to the filter protection sleeve 18. However, alternatively or additionally, it is also conceivable that the cover unit 36 ​​is fixed to the filter protection sleeve 18 by means of the mounting interface through a latch connection, a clamping connection or the like.

[0057] The cover unit 36 ​​has a further mounting interface 68 for detachably attaching a material removal unit (not shown here), in particular detachably attachable without tools. The further mounting interface 68 is provided for attaching the material removal unit to the cover unit 36 ​​instead of the filter protection sleeve 18. The further mounting interface 68 has, for example, two large locking notches 94 for establishing a latching connection with the material removal unit.

[0058] The material removal unit is, for example, a material collection container having at least one corresponding interface compatible with the further mounting interface 68 of the cover unit 36, in particular instead of a corresponding interface compatible with the mounting interface 34 of the cover unit 36. The material removal unit can, for example, comprise a hose, in particular at least one hose nipple, in particular in the form of a vacuum cleaner, having a corresponding interface compatible with the further mounting interface 68, in particular instead of a corresponding interface compatible with the mounting interface 34.

[0059] The cover unit 36 ​​is provided for rigidly connecting the machine tool 12 to the filter protective jacket 18 or the material removing unit, in particular at least one hose of the material removing unit, in particular for automatically carrying the filter protective jacket 18 or the material removing unit, in particular at least one hose of the material removing unit, when the machine tool 12 is moved.

[0060] The cover unit 36 ​​has a machine tool interface 64 for fastening to the machine tool 12, in particular to an ejection nipple 66 of the machine tool 12. The cover unit 36 ​​is provided for guiding material along a provided flight path from the machine tool 12, in particular the ejection nipple 66, fastened to the cover unit 36 ​​by means of the machine tool interface 64 to the filter protection sleeve 18 fastened to the cover unit 36 ​​by means of the mounting interface 34 of the cover unit 36 ​​or to a material removal unit fastened by means of another mounting interface 68 of the cover unit 36. The cover unit 36 ​​comprises an inlet opening 70 for receiving material from the machine tool 12 and an outlet opening 72 for discharging the material from the cover unit 36, in particular into the filter protection sleeve 18 or into the material removal unit, along the provided flight path.

[0061] The cover unit 36 ​​preferably comprises an in particular annular central wall 74 which delimits the outlet opening 72. The cover unit 36 ​​comprises an outlet central axis 76 which is in particular perpendicular to the outlet opening 72 of the cover unit 36 ​​through which the material is discharged from the cover unit 36. The outlet central axis 76 extends through the geometrical center of gravity of the central wall 74.

[0062] The cover unit 36 ​​comprises at least one fastening wall section 78 arranged on the central wall 74, on which the mounting interface 34 of the cover unit 36 ​​is arranged. The cover unit 36 ​​comprises at least one further fastening wall section 80 arranged on the central wall 74, on which the further mounting interface 68 is arranged. The cover unit 36 ​​comprises at least one wall section 82 arranged on the central wall 74 on the machine tool side, on which the machine tool interface 64 is arranged.

[0063] The cover unit 36 ​​has, in particular, an opening plane which preferably extends perpendicularly to the outlet center axis 76 . The opening plane limits the axial extension of the further fastening wall section 80 .

[0064] The additional fastening wall section 80 forms an air bypass 84 (see Figure 8 The air bypass 84 is formed by a slot of the further fastening wall section 80 that is different from the further mounting interface 68. The air bypass 84 and at least a larger part of the machine tool interface 64 or the entire machine tool interface 64 are arranged in different halves of the cover unit 36 ​​relative to at least one cutting plane including the outlet center axis 76.

[0065] The air bypass 84 is formed by at least one, particularly preferably exactly one, slit-shaped air bypass slot 86 of the further fastening wall section 80. The air bypass slot 86 extends from the opening plane of the cover unit 36 ​​at least substantially parallel to the outlet center axis 76. The maximum longitudinal extension of the air bypass recess 86 parallel to the outlet center axis 76 is greater than the maximum opening width of the air bypass protrusion 86 in a plane perpendicular to the outlet center axis 76. The maximum longitudinal extension of the air bypass slot 86 extends parallel to the outlet center axis 76 over at least a significant part of the maximum longitudinal extension of the further fastening wall section 80 parallel thereto. The air bypass slot 86 has an opening width of less than 60°, preferably less than 45°, particularly preferably less than 35° relative to the outlet center axis 76 in a plane perpendicular to the outlet center axis 76. The air bypass slot 86 has an opening width of greater than 25°, preferably greater than 20°, particularly preferably greater than 15° in a plane perpendicular to the outlet center axis 76.

[0066] The machine tool interface 64 comprises a base body made of a base material. The base body is constructed integrally with the wall section 82 on the machine tool side. The base body comprises a hollow cylindrical connecting element, in particular for receiving the ejection nipple 66 of the machine tool 12. The machine tool interface 64 comprises at least one fixing element 88 arranged on the base body, which fixing element is made of a different base material, in particular a thermoplastic elastomer.

[0067] The fixing element 88 forms a substantially closed lining of the base body, in particular the joint element, in the circumferential direction. The fixing element 88 preferably forms a sleeve arranged in the joint element. For example, the fixing element 88 forms an anchor arranged on the sleeve, which extends from the joint element and is arranged in a form-fitting manner, in particular, on the outer wall of the wall section 82 on the machine tool side. The fixing element 88 is preferably arranged on the base body by injection molding the base body.

[0068] The machine tool interface 64 comprises at least one contact element 90, 92 made of an electrically conductive material, in particular a carbon fiber reinforced plastic, for dissipating electrostatic charges (see Figure 7 ). The at least one contact element 90, 92 is preferably designed in the form of a web. The contact elements 90, 92 preferably extend from the inner wall of the base body. Preferably, the at least one contact element 90, 92 is implemented integrally with the base body. Preferably, the base material used to make the base body is equal to the conductive material of the at least one contact element 90, 92, in particular a carbon fiber reinforced plastic. In this way, it is particularly advantageous to further transmit or conduct the charge to the vacuum cleaner hose via the further mounting interface 34. The fixing element 88 preferably has at least one notch through which the contact elements 90, 92 extend or can be touched in order to make direct physical contact with the machine tool 12.

Claims

1. A material collecting device (10) for a machine tool (12), in particular for a grinding machine, comprising at least one filter element (14), a supporting element (16) which is arranged in the filter element (14) in the installed state for tensioning the filter element (14), and a filter protective sleeve (18) which is in particular rigid and has at least one air outlet (20), wherein: The filter element (14) is arranged in the filter protective sleeve (18) in the installed state.

2. The material collecting device (10) according to claim 1, characterized in that The filter protection sleeve (18) has a fixing unit (22) for arranging the filter element (14) in the filter protection sleeve (18) in a captive manner.

3. The material collecting device (10) according to claim 1 or 2, characterized in that: The support element (16) is designed to be rigid at least in the longitudinal direction (24).

4. The material receiving device (10) according to one of the preceding claims, characterized in that The support element (16) has at least one support strip (26) which is tapered when viewed in the radial direction.

5. The material collecting device (10) according to one of the preceding claims, characterized in that The filter protective sleeve (18) has at least one air guiding element (28) which is designed as a depression.

6. The material collecting device (10) according to one of the preceding claims, characterized in that At least a majority of the filter element (14) is arranged spaced apart from the filter protection sheath (18) when the filter element (14) is arranged in the filter protection sheath (18).

7. The material collecting device (10) according to one of the preceding claims, characterized in that The support element (16) is movable and / or deformable relative to the filter protection sleeve (18) in the installed state in order to generate an impact.

8. Material collecting device (10) according to one of the preceding claims, characterized in that The filter element (14) has a dust-repellent coating (30).

9. A support element (16) for a filter element (14) of a material collecting device (10) for a machine tool (12), in particular according to one of the preceding claims, the support element having a fastening unit (38) for fastening the filter element (14), characterized in that: A mounting interface (40) is provided for fixing the filter protection sleeve (18), in particular inside the filter protection sleeve (18).

10. A cover unit (36) for a material collecting device (10) for a machine tool (12), in particular according to one of claims 1 to 8, having a fixing unit (32) for fixing a support element (16) for a filter element (14), and having a mounting interface (34) for fixing a filter protective sleeve (18).

11. A machine tool (12), in particular a hand-held machine tool, preferably a grinding machine, having a material collecting device (10) according to one of claims 1 to 8, a supporting element (16) according to claim 9 and / or a cover unit (36) according to claim 10.

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