Handheld machine tools, especially jigsaws

Abstract

The present invention relates to a handheld power tool having a blowing device, the blowing device having a first air channel and being configured to provide an air flow, the first air channel having a sub-region connected to a first channel opening, the sub-region being arranged perpendicular to a guide plane or inclined to the guide plane, the first channel opening being configured to blow the air flow into a cutting region. The present invention also relates to a handheld power tool having a blowing device, the blowing device having a first air channel and a valve, the valve having a valve housing and a valve body that can be rotated between a first valve position and a second valve position, the valve body having an annular section, the annular section having a first valve opening, and the valve housing having a first valve channel, in the first valve position, the valve channel and the first valve opening having an overlap, the first valve channel being connected to the first air channel downstream.

Description

Technical Field

[0001] The invention relates to a handheld machine tool. Background Art

[0002] DE 10 338 602 B3 discloses a motor-driven saw having a housing, a cutting area and a motor, which is cooled by a fan device. The fan device draws air into the housing via an air inlet duct system and discharges it again from the housing via an air outlet duct system after passing through the motor. In the cutting area, a saw blade mounted on the saw intersects a guide plane determined by a guide device, in which the saw can rest on a workpiece. The air outlet duct system has an air outlet for applying air to the cutting area. The air outlet duct system has a second air outlet arranged above the cutting area and pointing toward the guide plane on an end side of the housing, through which an air curtain extending transversely to the cutting plane can be opened. Summary of the invention

[0003] The object of the present invention is to provide a hand-held power tool.

[0004] This object is achieved by means of the handheld power tool according to the invention. The invention also provides advantageous embodiments.

[0005] It has been recognized that a handheld machine tool, in particular an improved jigsaw, for producing a cut pointing in a feed direction in a workpiece can be provided in the following manner: the handheld machine tool has a tool receiver, a cutting area, a housing, a support device for supporting the handheld machine tool on a workpiece to be processed, in particular a base plate, and a blowing device. The housing has a housing bottom side and a housing end side. The tool receiver is configured to receive a plug-in tool, in particular a saw blade, along a receiving axis. The support device can be placed against the workpiece in a guide plane. The receiving axis intersects with the guide plane in the cutting area. The blowing device has a first air channel and is configured to provide an air flow. The first channel opening of the first air channel is arranged in front of the tool receiver on the side of the housing opposite to the cutting area on the bottom side of the housing along the feed direction. The first air channel has a sub-area connected to the first channel opening. The sub-area is arranged perpendicular to the guide plane or inclined to the guide plane. The first channel opening is configured to blow an air flow into the cutting area.

[0006] This configuration has the advantage that chips that fall during sawing and that could prevent a view of the cutting line on the workpiece are reliably removed from the workpiece by the air flow. It is also avoided that the air flow is disrupted, for example by an inserted tool, when penetrating into the cutting area.

[0007] It has been recognized that an improved hand-held power tool can be provided in the following manner: the hand-held power tool has a blowing device, wherein the blowing device has a first air channel and a valve and is constructed to provide an air flow, wherein the valve has a valve housing and a valve body supported so as to be rotatable about a rotation axis between a first valve position and a second valve position, the valve body having an annular section, wherein the annular section has a first valve opening, and the valve housing has a first valve channel, wherein in the first valve position, the valve channel and the first valve opening have an overlapping portion, wherein the first valve channel is connected to the first air channel downstream.

[0008] In another embodiment, the blowing device has at least one second air channel and a conveying unit, wherein the conveying unit is configured to convey an air flow during operation. The conveying unit is fluidically connected to the second air channel, wherein the second air channel leads to the cutting area at a distance from the second channel opening. The second channel opening is arranged on the side of the tool receiving part that is away from the housing end side. The second air channel is configured to guide at least a part of the other air flow in the direction of the cutting area during operation of the handheld power tool. By providing two air channels, reliable blowing away of chips can be guaranteed.

[0009] In another embodiment, the blowing device has a valve, wherein the valve has a first valve position and a second valve position. The valve is fluidically connected to the delivery unit on the input side. The valve is fluidically connected to the first air channel and the second air channel on the output side. In the first valve position, the first air channel is fluidically connected to the delivery unit. In the second valve position, the second air channel is fluidically connected to the delivery unit. This configuration has the advantage that, depending on the application of the hand-held power tool, the user can determine the corresponding blowing-off behavior of the hand-held power tool accordingly with the help of the valve.

[0010] In a further embodiment, in a first valve position, the first air channel is fluidically connected to the conveying unit and the second air channel is fluidically separated from the conveying unit. In a second valve position, the second air channel is fluidically connected to the conveying unit and the first air channel is fluidically separated from the conveying unit. This makes it possible to provide a particularly large air flow for blowing away the chips either forwards by means of the second air channel or from the front in all directions.

[0011] In a further embodiment, the valve has a third valve position. In the third valve position, the first air channel and the second air channel are fluidically separated from the delivery unit. This can (temporarily) prevent the chips from being blown away. In particular, in an unfavorable position of the handheld power tool, this can prevent the chips from being blown toward the user.

[0012] In another embodiment, the blowing device has an exhaust duct. The exhaust duct is connected to the valve on one side and leads to the surroundings of the handheld power tool on the other side. In the third valve position, the exhaust duct is fluidically connected to the delivery unit. This ensures reliable cooling of the drive of the handheld power tool even when blowing into the cutting area is stopped.

[0013] In another embodiment, the delivery unit has a fan impeller arranged on the drive shaft of the drive motor in a rotationally fixed manner. The valve has a valve housing and a valve body rotatably supported around an axis of rotation, the valve body having an annular section. The annular section surrounds the fan impeller on the radial outside. The annular section has a first valve opening and a second valve opening arranged offset relative to the first valve opening in the circumferential direction. In the first valve position, the first valve opening has a first overlap with the first valve channel and the annular section closes the second valve channel. The first valve channel and the first air channel are fluidically connected to each other and the second valve channel and the second air channel are fluidically connected to each other. In the second valve position, the annular section is arranged torsionally around the axis of rotation relative to the first valve position in the circumferential direction. In the second valve position, the first valve opening is arranged at a distance from the first valve channel and the annular section closes the first valve channel. In the second valve position, the second valve opening has a second overlap with the second valve channel. The advantage of this configuration is that the handheld power tool can be particularly compactly constructed for the valve and the delivery unit. In particular, the number of components of the valve is particularly small.

[0014] In another embodiment, the valve housing surrounds the annular segment with its inner circumference on the circumference of the annular segment and supports the annular segment in a manner that it can rotate around the rotation axis. The valve body has at least one operating lever extending outward in a radial square. The operating lever is connected to the annular segment. The housing has at least one recess. The recess leads to the outer circumference of the handheld tool. The operating lever passes through the corresponding recess. This configuration has the advantage that the valve can be switched particularly easily.

[0015] In another embodiment, the handheld power tool has a transmission. The transmission is connected to the drive motor on the input side and to the tool receiving part on the output side. The transmission is designed to convert the rotational movement of the drive motor into an oscillating movement of the tool receiving part. The first air channel extends at least partially around the transmission on the side of the transmission facing away from the cutting area.

[0016] In another embodiment, the handheld power tool has a saw blade having a saw section and a rod connected to the saw section. The rod engages in a tool holder and is connected to the tool holder. The saw section is plate-shaped and has at least one tooth row of saw teeth arranged only on a single side. The first air channel is designed to guide the air flow substantially parallel to the saw section or obliquely to the tooth row on the side facing the tooth row. This configuration has the advantage that chips that may be located between the teeth can also be reliably removed by means of the air flow, so that a particularly high cutting performance can be achieved.

[0017] In a further embodiment, the sub-area is arranged at an angle of 0° to 20° relative to the receiving area. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be explained in detail below based on the figures. It is shown here:

[0019] Figure 1 A longitudinal section of a hand-held power tool and a workpiece according to a first embodiment;

[0020] Figure 2 Figure 1 A top view of the handheld power tool shown;

[0021] Figure 3 Figure 1 and 2 A perspective view of a valve body of a valve of the handheld power tool shown;

[0022] Figure 4 Figure 1 and 2 The handheld power tool shown is along Figure 2 A cross-sectional view of the section plane AA shown;

[0023] Figure 5 Figure 2 The handheld power tool shown is along Figure 2 A cross-sectional view of the section plane AA shown;

[0024] Figure 6 and 7 According to the second embodiment, the handheld power tool is provided along the Figure 2 A cross-sectional view of the section plane AA shown in FIG.

[0025] Figure 8 A side view of a handheld power tool according to a third embodiment;

[0026] Fig. 9 Figure 8 A perspective view of a valve body of the handheld power tool shown; and

[0027] Fig.10 Figure 8The handheld power tool 10 shown is Figure 8 A cross-sectional view of the section plane BB is shown. DETAILED DESCRIPTION

[0028] Reference is made to a coordinate system in the following figures to facilitate understanding. The coordinate system is exemplarily configured as a right-hand coordinate system and has an x-axis (longitudinal direction), a y-axis (lateral direction) and a z-axis (height direction).

[0029] Figure 1 A longitudinal section through a handheld power tool 10 and a workpiece 15 are shown according to a first specific embodiment.

[0030] The handheld power tool 10 has a housing 20, a drive device 25, a blowing device 30, a support device 35 and a tool receiving part 40. The handheld power tool 10 is configured as a jigsaw in this embodiment. Of course, other configurations of the handheld power tool 10, such as a saber saw, are also conceivable.

[0031] The workpiece 15 is exemplarily configured in the form of a plate and has an exemplarily flat workpiece upper side / upper side 45. The support device 35 has a base plate 50. The base plate 50 has a guide plane 55 on the side facing the workpiece 15. The guide plane 55 extends in the xy plane. During the operation of the handheld power tool 10, the support device 35 is flatly placed on the workpiece upper side 45 with the guide plane 55.

[0032] The drive device 25 has a drive motor 60 and a transmission 70, the drive motor having a drive shaft 65. The transmission 70 is connected to the drive shaft 65 on the input side in a rotationally fixed manner. The drive motor 60 is configured as an electric motor, in particular a brushless motor. Alternatively, the drive motor 60 can also be configured as a brushed motor.

[0033] The drive motor 60 can be electrically connected to an electrical energy supply device (not shown), for example to a mains connection or an electrical energy storage device, in particular a battery. In addition, the drive device 25 can have a control device (not shown) for controlling the drive motor 60 .

[0034] The transmission 70 is connected to the tool receiving part 40 on the output side. The transmission 70 is designed to convert the rotational movement of the drive motor 60, which is provided to the transmission 70 via the drive shaft 65, into a repetitive, oscillating lifting movement for driving the tool receiving part 40, which is substantially perpendicular or slightly inclined to the guide plane 55.

[0035] The tool receiving part 40 has a receiving axis 75. The receiving axis 75 is arranged substantially vertically or slightly inclined to the guide plane 55. During the operation of the handheld power tool 10, the plug-in tool 80 is introduced into the tool receiving part 40. The plug-in tool 80 is exemplarily a saw blade 85 in this embodiment, which has a saw section 90 and a rod 95 connected to the saw section 90. The saw blade 85 is embedded in the tool receiving part 40 with the rod 95. The connecting device (not shown) of the tool receiving part 40 fastens the rod 95 in the tool receiving part 40. The saw blade 85 thus extends substantially along the receiving axis 75. The saw section 90 can be plate-shaped and extend substantially in the xz plane. The saw section 90 has at least one tooth row 100 consisting of saw teeth 105 only on a single side extending substantially in the yz plane. Of course, multiple tooth rows 100 can also be provided.

[0036] The receiving axis 75 intersects the guide plane 55 in the cutting region 110. During operation of the handheld power tool 10, the saw blade 85 moves in an oscillating manner with a lifting and lowering movement (essentially in the z direction) by the movement of the tool holder 40 and the coupling of the rod 95 to the tool holder 40. If the saw section 90 enters the workpiece 15, a cut 115 is produced in the workpiece 15. In this case, the formed chips are lifted upward from the cutting region 110 by the tooth row 100. In this case, the handheld power tool 10 moves in the feed direction V. The feed direction V extends parallel to the x-axis, but in the opposite direction of the x-direction. In the feed direction V, the tooth row 100 is arranged in front and the drive motor 60 is arranged in the back.

[0037] The housing 20 delimits a housing interior space 120 on the inside. A drive device 25 is arranged in the housing interior space 120. The housing 20 has a first housing end side 125 and a second housing end side 130. The first housing end side 125 is arranged in front along the feed direction V, and the second housing end side 130 is arranged on the back side of the housing 20 in a staggered manner along the feed direction V.

[0038] Furthermore, the housing 20 has a housing bottom side / bottom surface 135. A first section 140 directly adjoins the first housing end side 125 in the x direction, the housing bottom side 135 being arranged at a distance from the base plate 50 in the first section. An opening 145 is also provided in the housing 20 in the first section 140, wherein the opening 145 is penetrated by the tool receiver 40 and / or—depending on the operating state of the handheld power tool 10—by the insert tool 80.

[0039] A second section 150 of the housing bottom side 135 adjoining the first section 140 in the x-direction is connected to the base plate 50. The second section 150 is arranged on a side of the first section 140 facing the second housing end side 130.

[0040] The handheld power tool 10 may additionally have a guide device 155, such as a roller guide device. The guide device 155 is fastened to the second section 150 on the side of the tool receiver 40 and the inserted tool 80 facing away from the first housing end side 125. The guide device 155 supports the inserted tool 80 on the back side in the feed direction on the side facing away from the tooth row 100, so that the bending load of the inserted tool 80 about the y-axis is reduced. A reliable cut 115 is thus obtained in the workpiece 15.

[0041] The blowing device 30 has a first air channel 160, a second air channel 165, a valve 170, a conveying unit 175 and a suction unit 180. The suction unit 180 may have one or more suction channels 190, 195. The suction unit 180 has a suction opening 185 which is exemplarily arranged on the second housing end side 130. The first suction channel 190 of the suction unit 180 is connected to the suction opening 185, and the first suction channel is fluidically connected to the drive motor 60 on the side opposite to the suction opening 185. In addition, the suction unit 180 may have a second suction channel 195, wherein the second suction channel 195 fluidically connects the end side of the drive motor 60 facing the first housing end side 125 to the input side of the conveying unit 175.

[0042] The delivery unit 175 is fluidically connected downstream to the valve 170 . On the outlet side, the valve 170 is fluidically connected to the first air channel 160 and the second air channel 165 .

[0043] The first suction channel 190, the second suction channel 195, the first air channel 160 and the second air channel 165 are delimited by the housing 20. At least the first air channel 160 and the second air channel 165 are designed to be substantially fluid-tight relative to the housing interior 120.

[0044] The first air channel 160 follows the contour of the housing top 200 of the housing 20 from the valve 170 in the direction of the first housing end side 125. The first air channel 160 extends around the transmission 70 on the side of the transmission 70 opposite the cutting area 110 at the top. The first air channel 160 is arranged in the housing 20 essentially in a central position with respect to the maximum lateral extension. At the first housing end side 125, the first air channel 160 extends downward in the direction of the base plate 50. In the housing bottom side 135, the first air channel 160 opens into a first channel opening 205 in the first section 140 of the housing bottom side 135.

[0045] The first passage opening 205 is arranged opposite the guide plane 55 in the z direction. The first sub-region 210 of the first air channel 160 directly adjoins the first passage opening 205. The first sub-region 210, the tool receiving part 40 and the rotation axis 213 about which the drive shaft 65 rotates are arranged in a common plane. Figure 1 The common plane is arranged perpendicular to the guide plane 55. In addition, the receiving axis 75 also extends in the common plane. By way of example, the first sub-region 210 is arranged obliquely backward toward the receiving axis 75, preferably at an angle of 0° to 20° in the direction of the cutting region 110. Here, as the height relative to the cutting region 110 increases (z direction), the distance between the first sub-region 110 and the first housing end side 125 decreases.

[0046] The second air channel 165 extends below the drive device 25 and between the valve 170 and the housing bottom side 135. Here, the second air channel 165 opens into a second channel opening 211 in the housing bottom side 135 on the side of the second section 150 of the housing 20 facing the second housing end side 130. The second air channel 165 has a second sub-region 212 adjacent to the second channel opening 211, which is oriented obliquely backward. Here, as the height increases, the distance between the second sub-region 212 and the second housing end side 130 decreases.

[0047] Figure 2 Show Figure 1 A top view of a handheld power tool 10 is shown.

[0048] The housing 20 may additionally have a handle 220. The handle is arranged on the housing upper side 200. The handle 220 is arranged offset back relative to the transmission 70 in the feed direction V. The handle 220 is used to enable a user of the handheld power tool 10 to hold and position the handheld power tool 10 particularly well. The handle 220 is positioned here in the x direction between the second housing end face 130 and the transmission 70. In the z direction, the handle 220 is positioned, for example, above the drive motor 60.

[0049] The housing 20 has, on the outer circumference of the housing 20, a first housing side 225 and a second housing side 230 arranged in a lateral direction opposite the first housing side 225. The housing sides 225, 230 are axially symmetrical, for example with respect to an xz plane.

[0050] Figure 3 A perspective illustration of the valve body 235 of the valve 170 is shown.

[0051] The valve body 235 has an annular section 240 and at least one actuating lever 245, 250. In this embodiment, the valve body 235 of the valve 170 has a first actuating lever 245 and a second actuating lever 250 which is arranged offset in the circumferential direction preferably by 180° relative to the first actuating lever 245. The actuating levers 245, 250 are exemplarily plate-shaped. The first actuating lever 245 and the second actuating lever 250 are fastened on the radially outer side on the outer circumferential side 255 of the annular section 240. It is particularly advantageous that the valve body 235 is constructed in one piece and in one piece by an injection molding method, in particular plastic injection molding.

[0052] In the radial direction about the rotation axis 213, the first operating lever 245 and the second operating lever 250 have equal extension dimensions. Likewise, the cross-sections of the first operating lever 245 and the second operating lever 250 are exemplarily identical. The first operating lever 245 and the second operating lever 250 are exemplarily narrower than the annular section 240 in the axial direction about the rotation axis 213.

[0053] At least one valve opening 260 and a second valve opening 265 arranged circumferentially relative to the first valve opening 260 are arranged in the annular section 240. The first valve opening 260 has, for example, a rectangular opening cross section and is Figure 3 Arranged on the upper side. Figure 3 On the bottom side, a second valve opening 265 is arranged by way of example in the annular section 240. The first valve opening 260 and the second valve opening 265 have the same opening cross section.

[0054] Figure 4 The handheld power tool 10 is shown along Figure 2 A cross-sectional view of the section plane AA is shown.

[0055] The housing 20 has, for example, two housing shells 275 that are designed mirror-symmetrically to one another. The valve 170 has a valve housing 270. The valve housing 270 is integrally formed with the housing 20 and is made of one piece of material in this embodiment. The valve housing 270 can also be divided into two valve housings, wherein each valve housing is connected to a housing shell 275 in each case.

[0056] The valve housing 270 is fluidically connected to the first air channel 160 and to the second air channel 165 on the output side. In this embodiment, the first air channel 160 leads to the valve housing 270 on the upper side, and the second air channel 165 leads to the valve housing 270 on the lower side. The valve housing 270 surrounds the annular section 240 of the valve body 235 with the inner circumference 276 on the circumference. The inner circumference 276 extends on a circular trajectory around the rotation axis 213. Similarly, the annular section 240 is cylindrically configured around the rotation axis 213. The inner circumference 276 supports the valve body 235 in an operative connection with the outer circumference 255 in a rotatable manner around the rotation axis 213. In addition, the valve housing 270 determines the position of the valve body 235 in the axial direction.

[0057] At least one recess is arranged in the housing 20 and the valve housing 270, preferably a first recess 280 and a second recess 285. The first recess 280 is designed as a through opening and extends from the inner circumferential side 276 outward to the first housing side 225. The second recess 285 is arranged, for example, directly opposite the first recess 280 in the transverse direction and is designed, for example, to be identical to the first recess 280. The recesses 280, 285 are designed in the form of slits and extend, for example, over an angular section of 36°.

[0058] The second recess 285 extends from the inner circumferential side 276 outward to the second housing side 230. The first actuating lever 245 passes through the first recess 280 and the second actuating lever 250 passes through the second recess 285, wherein the first actuating lever 245 protrudes beyond the first housing side 225 and the second actuating lever 250 protrudes beyond the second housing side 230. Figure 4 The embodiment shown also makes it possible to provide only one recess 280 , 285 on the housing 20 and the valve housing 270 , wherein only one actuating lever 245 , 250 is provided in this case.

[0059] The valve 170 has a first valve position and at least one second valve position. Figure 4 , the valve 170 is shown in a first valve position. In the first valve position, the first valve opening 260 has a first overlap with a first valve channel 290 of the valve housing 270, which is fluidically connected to the first air channel 160. The first valve channel 290 extends radially outward from the inner circumference 276 and is arranged offset in the circumferential direction relative to the recesses 280, 285. The first air channel 160 is connected to the first valve channel 290. The annular section 240 closes the second valve channel 295 of the valve housing 270, so that the second air channel 165, which is fluidically connected to the second valve channel 295 on the output side, is fluidically sealed. The second valve channel 295 of the valve housing 270 extends radially outward from the inner circumference 276. The second air channel 165 is connected to the second valve channel 295.

[0060] During operation of the handheld power tool 10, the drive motor 60 is activated so that the drive shaft 65 rotates about the rotation axis 213. The delivery unit 175 may have a fan impeller 300, which is arranged axially on the drive shaft 65 between the transmission 70 and the drive motor 60 in a rotationally fixed manner. The fan impeller 300 is configured as a radial compressor impeller for example. On the peripheral side, the fan impeller 300 is surrounded by the annular section 240. As a result, a particularly compact design of the valve 170 and the delivery unit 175 can be provided. In particular, the valve 170 is already connected to the delivery unit 175 on the input side without a channel in terms of fluid.

[0061] During operation of the drive motor 60, the fan impeller 300 is drawn through the suction opening 185 (see Figure 1 ) air 325 is sucked in from the surroundings 305 of the handheld power tool 10. The air 325 is further introduced into the drive motor 60 via the first suction channel 190. The sucked air 325 flows through the drive motor 60 and cools the drive motor 60. The heated air 325 is sucked into the fan impeller 300 via the second suction channel 195. The fan impeller 300 further conveys the air 325 according to the valve position of the valve 170.

[0062] In the first valve position (see Figure 4 ), the fan impeller 300 conveys air 325 into the first air channel 160 through the first valve opening 260 and the first valve channel 290. The air 325 passes through the transmission 70 on the upper side of the transmission via the first air channel 160. The air 325 then flows downward in parallel following the first housing end side 125 in the direction of the cutting area 110. The first sub-area 210 defines the flow direction of the air 325 after it flows out of the first channel opening 205 before the air 325 flows out of the cutting area 110 via the first channel opening 205. Due to the obliquely rearward orientation of the first sub-area 210, the air 325 is blown into the cutting area 110 via the first channel opening 205 at an angle of 0° to 20° in the direction of the cutting area 110.

[0063] By blowing air 325 into the cutting area 110, the concentrated air flow 330 is introduced into a small area of ​​the cutting area 110 (see Figure 1 ). As a result, the air flow 330 has a particularly high flow velocity, so that the chips can be blown away particularly far. It is also ensured that the chips that fall when the cut 115 is produced are blown away from the cutting area 110 even at high feed speeds in the feed direction V. This has the advantage that the user has a clear view of the area in front of the plug-in tool 80 when working with the hand-held power tool 10.

[0064] Furthermore, the air 325 blown into the cutting region 110 assists in removing chips from the teeth 105 and from the inter-tooth spaces between the teeth 105 , so that a very good cleaning effect of the insert tool 80 is achieved and an undesired filling of the tooth row 100 with chips can be avoided.

[0065] It is also advantageous to blow the air 325 obliquely backward into the cutting region 110 so that when a suction device ( Figure 1 When the air 325 flows backwards in the direction of the second housing end side 130 with a horizontal component along the x direction, the chips are blown away backwards, so that the blown away chips can be well received by the suction device or directly blown into the suction device.

[0066] Furthermore, by blowing the air flow 330 from the front onto the tooth row 100, it can be ensured that the air flow 330 is not interrupted or deflected by the guide device 155 and / or the saw blade 85. This prevents chips from covering, for example, a cutting line drawn on the workpiece 15, so that the handheld power tool 10 can be guided precisely along the cutting line. This improves the precision of the handheld power tool 10.

[0067] As an alternative to the described orientation of the first sub-region 210, it is also conceivable that the first sub-region 210 is oriented parallel to the receiving axis 75 and blows into the cutting region 110 in a direction parallel to the air flow 330. This is particularly advantageous if the first air channel 160 is arranged in such a way that in particular the first sub-region 210 is arranged particularly close to the tool receiver 40, i.e. closer to the tool receiver 40 than to the first housing end side 125.

[0068] Figure 5 Show Figure 2 The portable power tool 10 is Figure 2 Sectional view of the cutting plane AA.

[0069] exist Figure 5 In the second valve position, the valve 170 is in the second valve position. In the second valve position, the valve body 235 is twisted about the rotation axis 213 relative to the first valve position. Figure 5 The second operating lever 250 arranged on the left side is at the bottom and the first operating lever 245 is at the top, and in the first valve position (such as Figure 4 ), the second operating lever 250 is at the top and the first operating lever 245 is at the bottom.

[0070] In the second valve position, the annular section 240 covers the first valve channel 290, so that the first valve channel 290 and the first air channel 160 connected thereto are separated from the delivery unit 175 in terms of fluid. However, the second valve channel 295 has a second overlap with the second valve opening 265. In the second valve position, the delivery unit 175 delivers air 325 into the second air channel 165 via the second valve opening 265 and the second valve channel 295. The air 325 flows out at the end of the second air channel 165 at the second channel opening 211 (see Figure 1 The air 325 flows obliquely from the back to the front (in the feed direction V) to the saw blade 85 in the form of a further air flow 335, so that the chips are blown away from the workpiece 15 from the back to the front. The second valve position is particularly suitable when working with the handheld power tool 10 overhead, for example.

[0071] Figure 6 The handheld power tool 10 according to the second embodiment is shown along the Figure 2 A cross-sectional view of the section plane AA is shown.

[0072] The handheld power tool 10 is basically the same as Figures 1 to 5 The handheld power tool 10 described above is designed identically. Figure 6 The handheld power tool 10 shown is Figures 1 to 5 The differences between the handheld power tools 10 shown.

[0073] exist Figure 6 1 shows the valve 170 in a first valve position, wherein the valve body 235 is relative to Figure 4 The rotation is such that the actuating levers 245 , 250 run in the horizontal direction (parallel to the y-axis).

[0074] The operating mode of the handheld power tool 10 corresponds to Figure 4 How it works is explained in .

[0075] The second valve position of the handheld power tool 10 corresponds to Figure 5 The second valve position explained in .

[0076] Figure 7 Show Figure 6 The handheld power tool 10 shown is Figure 2 A cross-sectional view of the section plane AA is shown.

[0077] The valve 170 additionally has a third valve position. The blowing device 30 may have an exhaust channel 301. The valve housing has a third valve channel 320. The third valve channel 320 extends radially outward from the inner circumference 276. The exhaust channel 301 is connected to the third valve channel 320. The exhaust channel 301 is connected to the valve 170 on one side and the exhaust channel 301 leads to the surrounding environment 305 of the handheld power tool 10 on the other side. In the third valve position, the valve 170 connects the delivery unit 175 to the exhaust channel 300 in terms of fluid. This configuration has the advantage that it is possible to ensure reliable cooling of the drive motor 60 without blowing into the cutting area 110.

[0078] The above-described embodiment of the hand-held power tool 10 has the advantage that it is possible to switch back and forth particularly quickly between valve positions by means of the valve body 235 by rotating the actuating levers 245 , 250 about the rotation axis 213 .

[0079] Figure 8 A side view of a handheld power tool 10 according to a third specific embodiment is shown.

[0080] The handheld power tool 10 is basically Figures 1 to 5 The handheld power tool 10 shown is Figure 6 and 7 The combination of the handheld power tool 10 explained. Figure 8 The handheld power tool 10 is shown relative to Figure 6 and 7 The differences between the handheld power tools 10 shown.

[0081] The housing 20 delimits a third air channel 310 instead of or in addition to the exhaust channel 301. The third air channel 310 is connected to the valve 170 on the input side and opens to the housing bottom side 135. The third air channel 310 is arranged on the side facing the second housing end side 130 and extends substantially in the height direction.

[0082] Fig. 9 Show Figure 8 A perspective illustration of a valve body 235 of a hand-held power tool 10 is shown.

[0083] The valve body 235 is basically Figure 3 The valve body 235 shown is constructed identically. Fig. 9 The valve body 235 shown is relative to Figure 3 The difference between the valve body 235 shown.

[0084] The valve body 235 has a third valve opening 315. The first and second valve openings 260, 265 are designed, for example, to be axially spaced apart from each other. Figure 3The third valve opening 315 is shown as narrow and arranged in a common rotation plane relative to the rotation axis 213. Axially offset relative to the first and second valve openings 260, 265, the third valve opening 315 is arranged circumferentially between the first valve opening 260 and the second valve opening 265. The third valve opening 315 has, for example, a configuration that corresponds to the first and second valve openings 260, 265.

[0085] Fig.10 Show Figure 8 The handheld power tool 10 is shown along the Figure 8 The cross-sectional view of the section plane BB is shown. Fig.10 In the embodiment, the valve 170 has only a first and a second valve position. The first valve position is Figure 4 Explained in Fig.10 In the embodiment, the valve is in the second valve position.

[0086] The valve housing 270 has a third valve passage 320. The third valve passage 320 is Fig.10 In the second valve position, the third valve opening 315 is connected downstream to the third air channel 310. In the second valve position, the third valve opening 315 has a third overlap with the third valve channel 320. In the second valve position, the air 325 is thus blown downward onto the workpiece 15 both via the second air channel 165 and via the third air channel 310. In particular, the air 325 from the third air channel 310 assists in the removal of chips by means of the suction device.

Claims

1. A hand-held power tool (10) for producing a cut (115) in a workpiece (15) directed in a feed direction (V), - having a tool receiving part (40), a cutting area (110), a housing (20), a supporting device (35) for supporting the handheld power tool (10) on a workpiece (15) to be processed, and a blowing device (30), -in, The housing (20) has a housing bottom side (135) and a housing end side (125). wherein the tool receiver (40) is designed to receive an insert tool (80) along a receiving axis (75), wherein the support device (35) can be placed against the workpiece (15) in a guide plane (55), - wherein the receiving axis (75) intersects the guide plane (55) in the cutting region (110), wherein the blowing device (30) has a first air channel (160) and is designed to provide an air flow (330, 335), It is characterized in that a first channel opening (205) of the first air channel (160) is arranged on the housing bottom side (135) on the side of the housing (20) opposite the cutting region (110) in the feed direction (V) in front of the tool holder (40), wherein the first air channel (160) has a subregion (210) adjoining the first channel opening (205), wherein the sub-region (210) is arranged perpendicularly to the guide plane (55) or obliquely to the guide plane (55), wherein the first channel opening (205) is designed to blow an air flow (330) into the cutting region (110), wherein the blowing device (30) has at least one second air channel (165) and a conveying unit (175), wherein the conveying unit (175) is designed to convey an air flow (330) during operation, wherein the delivery unit (175) is fluidically connected to the second air channel (165), wherein the second air channel (165) opens into a second channel opening (211) at a distance from the cutting area (110), wherein the second passage opening (211) is arranged on a side of the tool receiver (40) facing away from the housing end side (125), wherein the second air duct (165) is designed to guide at least a portion of the further air flow (335) in the direction of the cutting region (110) during operation of the hand-held power tool (10), wherein the conveying unit (175) has a fan wheel (300) which is arranged in a rotationally fixed manner on a drive shaft (65) of a drive motor (60), wherein the valve (170) comprises a valve housing (270) and a valve body (235) which is mounted so as to be rotatable about an axis of rotation (213) and which has an annular section (240), wherein the annular section (240) surrounds the fan impeller (300) radially on the outside, wherein the annular section (240) has a first valve opening (260) and a second valve opening (265) which is arranged offset relative to the first valve opening (260) in the circumferential direction, wherein, in a first valve position, the first valve opening (260) has a first overlap with a first valve channel (290) of the valve housing (270) and the annular section (240) closes the second valve channel (295), wherein the first valve channel (290) is fluidically connected to the first air channel (160) and the second valve channel (295) is fluidically connected to the second air channel (165), wherein, in the second valve position, the annular segment (240) is arranged in a twisted manner about the rotation axis (213) in the circumferential direction relative to the first valve position, wherein, in the second valve position, the first valve opening (260) is arranged at a distance from the first valve channel (290) and the annular section (240) closes the first valve channel (290), wherein, in the second valve position, the second valve opening (265) has a second overlap with the second valve channel (295).

2. The hand-held power tool (10) according to claim 1, - wherein the blowing device (30) has a valve (170), -in, The valve (170) comprises a valve housing (270) and a valve body (235) which is supported so as to be rotatable about an axis of rotation (213) between a first valve position and a second valve position and has an annular section (240). wherein the annular section (240) has a first valve opening (260) and the valve housing (270) has a first valve channel (290), wherein, in the first valve position, the first valve channel (290) and the first valve opening (260) have an overlap, - wherein the first valve channel (290) is connected downstream to the first air channel (160).

3. The hand-held power tool (10) according to claim 1, - wherein the blowing device (30) has a valve (170), -in, The valve (170) has a first valve position and a second valve position. wherein the valve (170) is fluidically connected to a delivery unit (175) on the input side, wherein, on the output side, the valve (170) is fluidically connected to the first air channel (160) and the second air channel (165), wherein, in a first valve position, the first air channel (160) is fluidically connected to the delivery unit (175), In the second valve position, the second air channel (165) is fluidically connected to the delivery unit (175).

4. The hand-held power tool (10) according to claim 1, -in, In a first valve position, the first air channel (160) is fluidically connected to the delivery unit (175) and the second air channel (165) is fluidically separated from the delivery unit (175). wherein, in the second valve position, the second air channel (165) is fluidically connected to the delivery unit (175) and the first air channel (160) is fluidically separated from the delivery unit (175).

5. The hand-held power tool (10) according to claim 1, - wherein the valve (170) has a third valve position, -in, In a third valve position, the first air channel (160) and the second air channel (165) are fluidically separated from the delivery unit (175).

6. The hand-held power tool (10) according to claim 5, -in, The blowing device (30) has an exhaust passage (301). wherein the exhaust air duct (301) is connected to the valve (170) on one side and opens into the surroundings (305) of the handheld power tool (10) on the other side, - wherein, in a third valve position, the exhaust gas channel (301) is fluidically connected to the delivery unit (175).

7. The hand-held power tool (10) according to claim 1, -in, The valve housing (270) surrounds the annular segment (240) on the circumference with the inner circumference (27) and supports the annular segment (240) in a manner that allows rotation about the rotation axis (213). wherein the valve body (235) has at least one actuating lever (245, 250) extending radially outwards, wherein the actuating lever (245, 250) is connected to the annular section (240), - wherein the housing (20) has at least one recess (280, 285), wherein the recess (280, 285) opens onto the outer circumference (255) of the hand-held power tool (10), wherein the actuating levers (245, 250) extend through corresponding recesses (280, 285).

8. The hand-held power tool (10) according to any one of claims 1 to 7, - having a transmission device (70), -in, The transmission (70) is connected to the drive motor (60) on the input side and to the tool holder (40) on the output side. wherein the transmission device (70) is designed to convert the rotational movement of the drive motor (60) into an oscillating movement of the tool holder (40), wherein the first air duct (160) extends at least partially around the transmission device (70) on a side of the transmission device (70) facing away from the cutting region (110).

9. The hand-held power tool (10) according to any one of claims 1 to 7, - a saw blade (85) having a saw section (90) and a rod (95) connected to the saw section (90), -in, The rod (95) engages in the tool receiving part (40) and is connected to the tool receiving part (40). wherein the saw segment (90) is of plate-shaped design and at least one tooth row (100) of saw teeth (105) is arranged only on a single side, wherein the first air channel (160) is designed to guide the air flow (330) on the side facing the tooth row (100) substantially parallel to the saw section (90) or obliquely toward the tooth row (100).

10. The hand-held power tool (10) according to any one of claims 1 to 7, wherein: The sub-region (210) is arranged at an angle of 0° to 20° relative to the receiving axis (75).

11. The hand-held power tool (10) according to any one of claims 1 to 7, wherein: The handheld machine tool (10) is a jigsaw; The supporting device (35) is a base plate (50); The insertable tool (80) is a saw blade (85).

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