hand-held power tool with a dust extraction hood

Abstract

A hand-held power tool (100) with a tool housing (110) in which a drive motor (115) for the rotary drive of a grinding or polishing tool (699) is arranged, and with an extraction hood (160) which is designed to enclose the grinding or polishing tool (699) at least partially and has a base body (161) and a pivoting element (200) pivotable thereon, wherein the base body (161) is designed to receive the grinding or polishing tool (699) and the pivoting element (200) is pivotable from a closed position (501) to an open position (122) for machining near the edge of the workpiece in order to open the extraction hood (160) at least partially, wherein the pivoting element (200) is arranged at least partially within the base body (161), characterized in thatthat the base body (161) is connected to an extraction tube (185) for removing dust generated during workpiece machining and has at least one bypass opening (180) for reducing negative pressure between the grinding or polishing tool (699) and an associated workpiece surface (198), wherein the pivoting element (200) in the opening position (122) at least partially covers the bypass opening (180) of the base body (161).

Description

State of the art

[0001] The present invention relates to a hand-held power tool with a tool housing in which a drive motor for driving a grinding or polishing tool in rotation is arranged, and with a suction hood which is designed to enclose the grinding or polishing tool at least in sections and a base body and an this pivotable pivoting element, the base body being designed to accommodate the grinding or polishing tool and the pivoting element being pivotable from a closed position into an open position for workpiece processing close to the edge to at least partially open the suction hood.

[0002] Such a handheld power tool with a suction hood is known from the prior art. This extraction hood has a base body and a pivoting element for processing the workpiece close to the edge. This is arranged outside of the base body, i.e. on an upper side of the base body or the suction hood, and can be pivoted from a closed position into an open position for at least partially opening the suction hood.

[0003] A disadvantage of this prior art is that the pivoting element of the suction hood is susceptible to external influences due to the arrangement outside of the base body. In addition, the pivoting element arranged outside of the base body can, for example, impede workpiece processing near the edge and thus make work more difficult. Disclosure of Invention

[0004] It is therefore an object of the invention to provide a new hand-held power tool with a suction hood that makes it easier to process the workpiece close to the edge and is robust against external influences.

[0005] This problem is solved by a handheld power tool with a tool housing in which a drive motor for driving a grinding or polishing tool in rotation is arranged, and with a suction hood that is designed to enclose the grinding or polishing tool at least in sections and a base body and a base body attached to this having pivotable pivot element. The base body is designed to accommodate the grinding or polishing tool and the pivoting element can be pivoted from a closed position into an open position for processing a workpiece close to the edge in order to open the suction hood at least in sections. The pivoting element is arranged at least in sections within the base body.

[0006] The invention thus makes it possible to provide a new hand-held power tool with a suction hood which, by arranging the pivoting element at least in sections within the base body, makes it easier to process the workpiece close to the edge and is robust against external influences. Furthermore, such a hand-held power tool enables improved extraction of dust occurring when the workpiece is machined close to the edge.

[0007] The base body is preferably designed in a helical shape at least in sections in the circumferential direction.

[0008] The pivoting element can thus be pivoted from the closed position into the open position within the base body in a simple manner.

[0009] The base body is preferably designed to form a smooth transition to the pivoting element in the closed position of the pivoting element in a first area and to protrude beyond the pivoting element in the radial direction in a second area.

[0010] It is thus possible to safely and reliably prevent or at least reduce dust escaping from the base body in the closed position.

[0011] According to one embodiment, the pivoting element has an operating element in order to enable pivoting from its closed position into the open position.

[0012] The invention thus enables an uncomplicated and easy pivoting of the pivoting element from its closed position into the open position.

[0013] In the closed position of the pivoting element, the grinding or polishing tool is preferably completely surrounded in its radial direction by the pivoting element and the base body, and in the open position of the pivoting element protrudes in its radial direction at least in sections from an outer peripheral section of the base body.

[0014] It is thus possible in a simple manner to process the workpiece close to the edge with the grinding or polishing tool in the open position of the pivoting element.

[0015] The base body is preferably connected to a suction pipe for removing dust occurring during workpiece processing and has at least one bypass opening for reducing negative pressure between the grinding or polishing tool and an associated workpiece surface.

[0016] In this way, the dust occurring during the machining of a workpiece can be transported away safely and reliably, it being possible at least to reduce dust escaping from the suction hood or the base body.

[0017] According to one embodiment, the pivoting element covers the bypass opening of the base body at least in sections in the open position.

[0018] Thus, in the open position of the pivoting element, the dust extraction can be focused on the at least partial opening of the extraction hood and thus the escape of dust can be at least reduced.

[0019] The suction hood is preferably secured against twisting by a holder on the tool housing.

[0020] In this way, the extraction hood can be fixed stably and securely to the tool housing.

[0021] The holder is preferably fixed to the tool housing via at least one associated fastening means.

[0022] The suction hood can thus be fixed to the tool housing in a robust and reliable manner.

[0023] The problem mentioned at the outset is also solved by a suction hood for a hand-held power tool with a tool housing in which a drive motor for driving a grinding or polishing tool in rotation is arranged, the suction hood being designed to enclose the grinding or polishing tool at least in sections and to base body and a pivoting element that can be pivoted on it, the base body being designed to hold the grinding or polishing tool and the pivoting element being pivotable from a closed position into an open position for workpiece processing close to the edge in order to open the suction hood at least in sections, and the pivoting element being at least partially inside of the body is arranged. Brief description of the drawings

[0024] The invention is explained in more detail in the following description on the basis of exemplary embodiments illustrated in the drawings. Show it:

[0025] figure 1 is a plan view of a hand-held power tool with a suction hood according to the invention, which is provided with a pivoting element according to one embodiment,

[0026] figure 2 is a plan view of an upper side of the pivoting member of FIG figure 1,

[0027] figure 3 is a plan view of an underside of the pivoting member of FIG figure 1,

[0028] figure 4 is a plan view of an underside of a portion of the handheld power tool of FIG figure 1, with the pivoting element of FIG. 1 shown in an open position figure 1,

[0029] figure 5 is a plan view of an underside of a portion of the handheld power tool of FIG figure 1, with the pivoting member of FIG figure 1,

[0030] figure 6 is a perspective view of a portion of the handheld power tool of FIG figure 1, with the pivoting member of FIG figure 1, and

[0031] figure 7 is a sectional view of a portion of the handheld power tool of FIG figure 1 seen along a section line VII-VII of figure 1. Description of the exemplary embodiments

[0032] figure 1 shows an exemplary handheld power tool, preferably designed as a concrete grinder 100with a tool box 110 , in which at least one drive motor 115 with an output shaft ( 420 in figure 4) to drive a grinding or polishing tool 699 is arranged. This is illustrative in the manner of a sanding plate for sanding a workpiece on an associated workpiece surface 198 formed, but can alternatively also in the manner of a polishing plate for polishing the associated workpiece surface 198 be trained. A grinding or polishing plate of this type is sufficiently known from the prior art, so that a detailed description thereof is dispensed with here in order to keep the description concise.

[0033] The one with a tool head 150 provided tool housing 110 forms an example of an elongated shape with a handle 120 off and is via a manual switch 140 can be actuated, i.e. switched on and off. However, the tool housing could 110 also have any other shape. Here is the hand tool 100 example with a power cable 130 designed for mains-dependent power supply, but could also be provided with a battery pack for mains-independent power supply.

[0034] According to one embodiment, the handheld power tool 100 an exhaust hood 160 with a cup or bell-like body 161 on. This has a - in figure 1 closed - top 164 and one - in figure 1 open - bottom 165 up and is at its open bottom 165 for holding the grinding or polishing tool 699 educated. Furthermore, the main body 161 at its closed top 164 with a wall surface 170 provided on which a ring wall 171 for the arrangement of brushes ( 610 in figure 6) is designed to allow dust to escape from the suction hood 160 during operation of the hand tool machine 100 at least reduce. The wall surface 170 preferably has an opening 172 for arrangement on the tool head 150 the hand tool 100 on. General is the exhaust hood 160 trained to do so with their wall surface 170 and the ring wall 171 , i.e. with its basic body 161 , and the brushes ( 610 in figure 6) the grinding or polishing tool 699 to enclose at least partially in its radial direction.

[0035] The base body 161 or the wall surface 170 is preferred with a suction tube 185 connected, one on the wall surface 170 arranged, preferably oval opening ( 466 in figure 4) having a preferably circular cross-section 186 transforms. However, the suction tube can 185 also have any other cross-sectional shape. The base body is preferred 161 and the suction pipe 185 formed in one piece.

[0036] The suction pipe 185 is for removing an assigned workpiece surface during workpiece processing 198 formed dust. The suction pipe can do this 185 e.g. be connected to a suction device via a hose. In addition, the suction pipe 185 also be designed in the manner of an adapter for fixing the hose of the suction device.

[0037] Furthermore, the body 161 preferably at least one bypass opening 180 on, to avoid or reduce a vacuum between the grinding or polishing tool 699 and the assigned workpiece surface 198 is trained. The at least one bypass opening 180 points, preferably on the top 164 of the body 161 , a preferably wedge-shaped extension 181 on. The at least one bypass opening is illustrative 180 and the suction pipe 185 in figure 1 on each side of the tool housing 110 arranged, but they could also be swapped, on the annular wall 171 or at another position on the base body 161be arranged.

[0038] According to one embodiment, the base body 161 an opening segment designed in the manner of a recess 162 on. This is designed such that a base body 161 arranged swivel element 200 in its radial direction, at least in sections, an outer peripheral section 199 of the body 161 towers over Preferably, the outer peripheral portion 199 a straight outline.

[0039] The opening segment is preferred 162 formed in such a way that a straight line 192 one in the area of ​​the suction pipe 185 arranged edge 166 and one opposite on the ring wall 171 trained corner 167 of the body 161 connects with each other. This straight 192 forms a tangential outer edge of the suction pipe 185 training straights 193 a predetermined angle α. This angle α is specified such that between the handle 120 the hand tool 100 and the suction pipe 185 sufficient free space for one hand of a user of the hand-held power tool 100 is available, thereby enabling trouble-free work. The angle α is preferably designed as a 90° angle. Furthermore, the straight line 192 with a central axis 190 the hand tool 100 forms an angle β which is preferably in the range from 60° to 120°. Likewise, one is at a predetermined angle γ, preferably at a 90° angle, to the straight line 192 arranged straight line 191 shown in such a way on the annular wall 171 is arranged that a first and second contact point A, B form. In this case, the first contact point A is preferably on the ring wall 171 arranged and the second point of contact B in the area of ​​the power cable 130 on the handle 120 arranged.

[0040] At least in sections within the base body 161 or in the area of ​​its underside 165 , is the swivel element 200 arranged, the near-edge workpiece processing for at least partially opening the suction hood 160 from a shutter position ( 501 in figure 5) to an open position 122 is pivotable. In this open position 122 is the swivel element 200 at least in sections, illustratively completely, within the base body 161 arranged. The pivoting element has for pivoting 200 a control 222 on.

[0041] figure 2 shows the pivoting element 200 from figure 1, the first, here upper - front side 201 and a second – here lower – end face 202 having. The swivel element 200 has a preferably disc-shaped ring 210 with a recess 212 , which to arrange in a on the bottom 165 of the body 160 from figure 1 trained groove ( 771 in figure 7) is provided. An outer perimeter 217 of the ring 210 increases in at least one area 218 on an outer circumference 219 and thus forms an extension 215 of the ring 210 out. The area 218 preferably comprises at least an angle of 90° to 150°, preferably an angle of about 120°. The extension 215 points along the outer perimeter 219 , preferably in an axial direction, a reinforcement edge 225 on.

[0042] According to one embodiment, the pivoting element 200 funnel-shaped, with the ring 210 versus the enlargement 215 is raised. In addition, preferably on the upper end face 201 of the swivel element 200 in the area of ​​expansion 215 its control 222 arranged. This can be done by applying a force, for example along a circumferential direction 599 , for swiveling the swivel element 200 in the body 161 from figure 1 can be pressed.

[0043] figure 3 shows the lower end face 202of the swivel element 200 from figure 2 and illustrates its funnel-shaped design. The swivel element 200 points at its lower end face 202 in the area of ​​the ring 210 preferably a guide surface 312 on, as well as one the outer circumference 217 at least partially reinforcing annular collar 313 .

[0044] Preferably, the pivoting element 200 with the ring 210 between a groove ( 771 in figure 7) of the body 161 from figure 1 and one arranged in this and on the hand-held power tool 100 from figure 1 fixed bracket ( 410 in figure 4) to be arranged, with the guide surface 312 the bracket ( 410 in figure 4) facing and the gorget 313 preferably for radially embracing the holder ( 410 in figure 4) serves. Furthermore, the swivel element 200 in the area of ​​expansion 215 preferably with a dedusting surface 315 provided, over which the dust produced during the machining of the workpiece can preferably be transported away.

[0045] In addition, the reinforcement edge 225 illustratively a groove 310 for the arrangement of brushes ( 620 in figure 6) on. Through the dedusting surface 315 and the one in the groove 310 arranged brushes ( 620 in figure 6) can at least reduce dust escaping from the extraction hood 160 from figure 1 are made possible.

[0046] figure 4 shows the extraction hood 160 the hand tool 100 from figure 1, for arranging the pivot element 200 from figure 1 to figure 3 in the bottom area 165 of the body 161 one preferably along the circumferential direction 599 from figure 2 and figure 3 trained, snail-shaped inner contour 460 having. "Snail-shaped" here means that the base body 161 or the inner contour 460 at least in sections of a predetermined first radius 461 to a predetermined second radius 462 increased, preferably counter to the circumferential direction 599 . Here is the inner contour 460 preferably against the circumferential direction 599 from the edge 166 of the body 161 up to its bypass opening 180 helical and from the bypass port 180 to its corner 167 circular in shape, but the inner contour could 460 also show an even progression. Also is in figure 4 the preferably oval opening 466 of the suction pipe 185 clarified.

[0047] According to one embodiment, this is concealed within the base body 161 arranged swivel element 200 in its open position 122 the bypass opening 180 at least in sections, but preferably completely. Thus, dust suction is applied to the outer peripheral portion 199 of the body 161 focused and an undesired exit of dust from the extraction hood 160 at least reduced. Furthermore, the suction hood 160 preferably via a trough or plate-shaped holder 410 with at least one associated fastening means, preferably designed as a screw 430 , 431 , 432 , 433 on the tool housing 110 fixed to prevent twisting. Also is in figure 4 a coupling element 450 shown on an output shaft 420 the hand tool 100 arranged and in the holder 410 is stored and used as an example for centering a tool holder ( 710 in figure 7) the grinding or polishing tool 699 from figure 1 is formed.

[0048] figure 5 shows the extraction hood 160 the hand tool 100 from figure 1, in which the pivoting element 200 from the opening position 122 from figure 4 e.g. by a movement against the circumferential direction 599 from figure4 to a locked position 501 was proceeded. Preferably, the pivoting element 200 thereby in at least one position between the open position 122 and the locking position 501 be locked.

[0049] In the locked position 501 form the main body 161 and the swivel element 200 the suction hood 160 a preferably snail-shaped interior 510 out. Here forms the base body 161 preferably in at least a first area B1 a smooth transition to the pivoting element 200 The base body protrudes from and in at least one second area B2 161 the swivel element 200 in radial direction. In the interior 510 can the grinding or polishing tool 699 from figure 1 are arranged for a workpiece processing. Thus, the grinding or polishing tool 699 from the swivel element 200 and the base body 161 completely enclosed in its radial direction.

[0050] figure 6 shows the suction hood 160 the hand tool 100 from figure 1, with the main body 161 and the swivel element 200 , each of which has a plurality of brushes 610 , 620 are arranged. Those brushes 610 , 620 form, for example, a ring-shaped brush and are designed to collect the dust that occurs during workpiece processing below the extraction hood 160 to keep. The swivel element 200 associated brushes 620 are preferably in its groove 310 from figure 3 arranged and the base body 161 associated brushes 610 are preferred in one of the groove 310 corresponding groove ( 770 in figure 7) of the body 161 arranged.

[0051] figure 7 shows the one with the output shaft 420 from figure 4 and the extraction hood 160 from figure 1 provided hand tool 100 from figure 1, whose handle 120 only partially shown here to simplify the drawing. Illustrative is on the tool head 150 the hand tool 100 a first area 750 the output shaft 420 arranged. This first area 750 widens illustratively against a direction of a reference number 702 marked arrow gradually into a second, then into a third and then into a fourth area 751 , 752 , 753 and then decreases to a fifth range 754 .

[0052] On the second area 751 is a crown wheel preferably pressed onto this 760 arranged that the output shaft 420 drives. Furthermore, in the second area 751 a bearing element designed preferably as a roller bearing, preferably as a ball bearing 725 arranged. Preferably this is in a recess 731 a flange 730 stored and preferred by one in the third area 752 arranged, cover plate 740 covered. This is preferably provided with a U-shaped cross section and forms a labyrinth to prevent damage when the workpiece is being machined while the hand-held power tool is in operation 100 accumulating dust so that it does not get into the area of ​​the crown wheel 760 can reach.

[0053] Illustrative is in figure 7 below the flange 730 the coupling element 450 from figure 4 arranged, for example, an opening 787 , which have a first and second area 788 , 789 trains, has. The first area 788 preferably has a fourth area 753 the output shaft 420 adjusted diameter on and the second area 789 preferably has a fifth range 754 the output shaft 420 adjusted diameter. Furthermore, the output shaft 420 in the fifth area 754 at a - in figure 7 lower – axial end face 790a preferably designed as a threaded hole recess 780 on which to arrange a grinding or polishing tool 699 from figure 1 fixing means is formed.

[0054] According to one embodiment is a tool holder 710 for receiving or supporting the grinding or polishing tool 699 from figure 1 provided by the coupling element 450 at least approximately on the output shaft 420 is centered. For this purpose, the coupling element 450 on its from the bearing element 725 side facing away from a recess 792 on that one shot 794 for a sealing and centering element designed as an O-ring 785 and a plant area 793 trains.

[0055] The tool holder 710 preferably has a funnel or umbrella-shaped body 724 on which a floor surface 721 with an opening preferably designed as a centering opening 723 has and on one of the coupling element 450 a peripheral collar on the opposite side 722 trains. The Circumferential Collar 722 is for arranging the grinding or polishing tool 699 with a plurality of ridges 715 , 716 , 717 , 718 educated. At one between the floor surface 721 and the perimeter collar 722 trained ring wall 719 is at least one and illustratively three openings 711 , 712 , 713 arranged, via the dust generated during workpiece processing, e.g. through an opening in the grinding or polishing tool 699 into the tool holder 710 is conducted, can be transported away. A diameter of the annular wall preferably tapers 719 in the direction of the arrow 702 . In addition, the tool holder 710 with their opening 723 on the plant surface 793 of the coupling element 450 arranged. Furthermore, this is attached to the peripheral collar 722 arranged grinding or polishing tool 699 from figure 1 with at least one fastening element, e.g. an associated screw, on the at least one opening 780 the output shaft 420 fastened.

[0056] How out figure 7 shows the trough-shaped or plate-shaped holder 410 from figure 4, according to one embodiment, a floor surface 741 with a ring wall 743 and a circumferential collar which is preferably beveled in the radial direction 744 on. For torsion-proof arrangement on the tool housing 110 the hand tool 100 points the bracket 410 on their floor surface 741 an opening 742 on taking this from the output shaft 420 decoupled. Furthermore, the bracket 410 with at least one and illustratively with two fastening means 430 , 431 , e.g. screws, on the tool housing 110 fixed.

[0057] Illustrative attach the fasteners 430 , 431 the bracket 410 , the body 161 the suction hood 160 and the flange 730 on the tool housing. Here, the pivot element 200 the suction hood 160 rotatable between one on the base body 161 the hood 160 trained groove 771 and the bracket 410 fixed. Preferably, the bracket secures 410 here the swivel element 200 so axially that this is axially immovable at least within predetermined tolerances. In addition, forms the bracket 410 an additional labyrinth that allows the dust produced to penetrate into a drive section of the hand-held power tool 100 at least reduced, preferably prevented. Furthermore, in figure 7 one of groove 310 corresponding groove 770 for arranging the brushes 610 on the body 161 the hood 160 shown.

Claims

[1] hand-held power tool ( 100 ) with a tool housing ( 110 ), in which a drive motor ( 115 ) for the rotating drive of a grinding or polishing tool ( 699 ) is arranged, and with an extraction hood ( 160 ), which is trained to use the grinding or polishing tool ( 699 ) to enclose at least sections of it and to form a basic body ( 161 ) and a pivoting element that can be swivelled on it ( 200 ) has the base body ( 161 ) for holding the grinding or polishing tool ( 699 ) is formed and the swivel element ( 200 ) for machining workpieces close to the edge, for at least partial opening of the extraction hood ( 160 ) from a locking position ( 501 ) into an open position ( 122 ) is swivel-mounted, characterized by that the swivel element ( 200 ) at least sectionally within the base body ( 161 ) is arranged. [2] Hand-held power tool according to claim 1, characterized by that the basic body ( 161 ) in circumferential direction ( 599 ) is at least partially spiral-shaped. [3] Hand-held power tool according to claim 1 or 2, characterized by that the basic body ( 161 ) is trained to be in the closed position ( 501 ) of the swivel element ( 200 ) in a first area (B1) a smooth transition to the swivel element ( 200 ) to train and in a second area (B2) the swivel element ( 200 ) to extend beyond in a radial direction. [4] Hand-held power tool according to any one of the preceding claims, characterized by that the swivel element ( 200 ) a control element ( 222 ) exhibits a pivoting from its locking position ( 501 ) into the open position ( 122 to enable. [5] Hand-held power tool according to any one of the preceding claims, characterized by that the grinding or polishing tool ( 699 ) in the closed position ( 501 ) of the swivel element ( 200 ) from the swivel element ( 200 ) and the base body ( 161 ) is completely enclosed in its radial direction and in the open position ( 122 ) of the swivel element ( 200 ) in its radial direction at least section by section an outer circumferential section ( 199 ) of the basic body ( 161 ) towers above. [6] Hand-held power tool according to any one of the preceding claims, characterized by that the basic body ( 161 ) with a suction pipe ( 185 ) is connected to the removal of dust generated during workpiece machining and includes at least one bypass opening ( 180 ) to reduce negative pressure between the grinding or polishing tool ( 699 ) and an associated workpiece surface ( 198 ) exhibits. [7] Hand-held power tool according to claim 6, characterized by that the swivel element ( 200 ) in the open position ( 122 ) the bypass opening ( 180 ) of the basic body ( 161 ) at least partially obscured. [8] Hand-held power tool according to any one of the preceding claims, characterized by that the extraction hood ( 160 ) via a bracket ( 410 ) on the tool housing ( 110 ) is securely fixed against twisting. [9] Hand-held power tool according to claim 8, characterized by that the holder ( 410 ) via at least one associated fastening device ( 430 , 431 , 432 , 433 ) on the tool housing ( 110 ) is fixed. [10] Extraction hood ( 160 ) for a hand-held power tool ( 100 ) with a tool housing ( 110 ), in which a drive motor ( 115 ) for the rotating drive of a grinding or polishing tool ( 699) is arranged, with the extraction hood ( 160 ) is trained to use the grinding or polishing tool ( 699 ) to enclose at least sections of it and to form a basic body ( 161 ) and a pivoting element that can be swivelled on it ( 200 ) having a base body for receiving the grinding or polishing tool ( 699 ) is formed and the swivel element ( 200 ) for machining workpieces close to the edge, for at least partial opening of the extraction hood ( 160 ) from a locking position ( 501 ) into an open position ( 122 ) is swivel-mounted, characterized by that the swivel element ( 200 ) at least sectionally within the base body ( 161 ) is arranged.

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