Portable work appliance
By constructing an efficient ejection opening on the side of the casing of the portable work tool, the problem of low chip extraction efficiency in the prior art is solved, and a good chip extraction effect is achieved in short guide rails and wood cutting machine applications.
Patent Information
- Application Number
- CN202410956734.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-07-18
- Filing Date
- 2024-07-17
- Publication Date
- 2025-01-21
AI Technical Summary
Existing portable working equipment has problems with inefficiency in chip export, especially in applications such as short guide rails and wood cutting machines, which can easily lead to poor chip export.
A portable work tool is designed, the shell of which is configured with a throwing opening for throwing sawdust from the sprocket space into the external environment, the first section of the throwing opening is located in the first longitudinal direction of the housing side and have a height of at least 5mm to ensure good chip export.
The lateral arrangement of the ejection opening ensures that the chips can be ejected effectively when the operator uses the entire length of the guide rail. This is also ensured even when the front side of the wood cutting machine rests against the workpiece, especially Suitable for long sawdust formed in longitudinal cuts.
Smart Images
Figure CN119328855A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a portable (or portable, ie tragbares) working tool. Background Art
[0002] Portable working tools, such as motor chain saws, are known which have a discharge opening for discharging chips from the sprocket space into the environment. Usually, such a discharge opening is formed on the underside of the portable working tool, i.e., below the load return section of the saw chain. In addition, such working tools also include a discharge opening at the front side of the working tool. The saw chain is guided from the sprocket space into the environment via the discharge opening formed at the front side. Summary of the invention
[0003] The object of the present invention is to provide a portable work tool of the generic type which allows good chip removal.
[0004] The object is achieved by a portable work tool, comprising a housing, a drive motor arranged in the housing, a guide rail with a longitudinal center axis and a saw chain, wherein the drive motor drives the saw chain guided in a guide groove of the guide rail in a circumferential manner via a drive sprocket, wherein a longitudinal plane of the guide rail is spanned by the guide groove, wherein the housing comprises a base housing and a sprocket cover, wherein the base housing and the sprocket cover delimit a sprocket space, wherein the housing comprises a front side and a rear side, wherein the guide rail projects out of the housing at the front side, wherein the housing has a first longitudinal side and a second longitudinal side, the front side and the rear side of the housing being connected via the first longitudinal side and the second longitudinal side, wherein in particular the housing has an upper side and a lower side, wherein a discharge opening for discharging sawdust from the sprocket space into the external environment is formed on the housing, wherein the discharge opening has a first section, which is formed at a first longitudinal side of the portable work tool and has a height measured parallel to the longitudinal plane and perpendicular to the longitudinal center axis of the guide rail, wherein the height is at least 5 mm.
[0005] The portable work tool according to the invention comprises a housing, a drive motor arranged in the housing, a guide rail with a longitudinal center axis and a saw chain, wherein the drive motor drives the saw chain guided in a guide groove of the guide rail in a circumferential manner via a drive sprocket, wherein a longitudinal plane of the guide rail is spanned by the guide groove, wherein the housing comprises a base housing and a sprocket cover, wherein the base housing and the sprocket cover delimit a sprocket space, wherein the housing comprises a front side and a rear side, wherein the guide rail projects out of the housing at the front side, wherein the housing has a first longitudinal side and a second longitudinal side, the front side and the rear side of the housing being connected via the first longitudinal side and the second longitudinal side, wherein in particular the housing has an upper side and a lower side, wherein a discharge opening for discharging sawdust from the sprocket space into the external environment is formed on the housing, wherein the discharge opening has a first section, which is formed at a first longitudinal side of the portable work tool and has a height h measured parallel to the longitudinal plane and perpendicular to the longitudinal center axis of the guide rail, wherein the height is at least 5 mm, in particular at least 7.5 mm, in particular at least 10 mm. In other words, the first section of the ejection opening has a height h which, in a projection onto the longitudinal plane of the guide rail in a direction perpendicular to the longitudinal plane, is at least 5 mm, in particular at least 7.5 mm, preferably at least 10 mm.
[0006] It has been shown that the lateral configuration of the ejection opening at the housing can be particularly good for the removal of chips. This is particularly advantageous in portable working tools (such as wood cutting machines) with short guide rails. In such working tools, the operator often uses the entire length of the guide rail and sinks the guide rail into the workpiece with its entire length. If the housing hits the workpiece with its front side, this may lead to the closure of the ejection opening configured at the front side of the housing. The removal of chips is no longer optimally achieved. By the lateral arrangement of the ejection opening, even if the wood cutting machine is against the workpiece with its front side, chips can be transported to the external environment through the ejection opening. In addition, the lateral arrangement of the ejection opening is also proven to be particularly advantageous in the longitudinal cutting of wood. The sawdust formed by the longitudinal cutting is particularly long, which makes it difficult to remove these chips. Here, the lateral ejection opening arranged at the housing has been proven to be particularly advantageous.
[0007] In particular, it is provided that the ejection opening is at least partially formed by a recess in the sprocket cover. Thus, in particular, chips are discharged from the sprocket space into the external environment via the sprocket cover. In particular, it is provided that the guide rail has a longitudinal upper side and a longitudinal lower side lying opposite to a longitudinal center axis of the longitudinal upper side, wherein the ejection opening is arranged in the region of the longitudinal upper side of the guide rail. Thus, the ejection opening is arranged on the unloaded return run side of the saw chain.
[0008] The first section of the ejection opening has, in particular, a length measured in the direction of the longitudinal center axis which is greater than the height of the ejection opening. The first section of the ejection opening is designed, in particular, substantially rectangularly in a viewing direction of the sprocket cover perpendicular to the longitudinal plane of the guide rail. The first section of the ejection opening is thus large enough to enable the ejection of chips via the longitudinal sides of the housing. In alternative embodiments, the ejection opening can also have a shape, for example the ejection opening can open in the shape of a triangle in the direction of the guide rail.
[0009] In particular, it is provided that the ejection opening is designed in such a way that a first section of the ejection opening extends in the direction of the longitudinal center axis of the guide rail from a first end to a second end, wherein the ejection opening is designed in such a way that in a viewing direction of the sprocket cover perpendicular to the longitudinal plane of the guide rail, the saw chain is covered by the housing, in particular by the sprocket cover, between the first end and the second end of the first section of the ejection opening over at least 50%, in particular at least 65%, in particular at least 80%, and in particular also over its entire extension.
[0010] In particular, it is provided that the cover region projects beyond the saw chain by at least 1.0 mm in a direction extending away from the longitudinal center axis of the guide rail and parallel to the longitudinal plane of the guide rail. In other words, in a projected view onto the longitudinal plane of the guide rail in a direction perpendicular to the longitudinal plane, the cover region projects beyond the saw chain by at least 1.0 mm in a direction extending away from the longitudinal center axis of the guide rail.
[0011] In particular, it is provided that in the region of the ejection opening, the housing tapers, in particular conically, in the direction of the front side of the housing, wherein in the second section of the ejection opening, at the first end of the ejection opening, a further recess is provided on the housing, in particular on the sprocket cover, which exposes the saw chain in the viewing direction of the sprocket cover perpendicular to the longitudinal plane of the guide rail. The conical configuration of the housing towards the front side of the housing enables a slender design of the housing at the front side. This ensures high accessibility to the workpiece by the work tool. This is particularly advantageous in the delimbing of trees. The ejection opening is enlarged by the further recess, in particular on the front side of the housing. This makes it possible to compensate for the narrowing of the ejection opening due to the conicity of the housing towards the front side. The ejection opening is therefore large enough to ensure sufficient chip ejection.
[0012] Advantageously, it is provided that the ejection opening comprises a second section, which is formed at the front side of the housing. Thus, chips can be ejected from the sprocket space via a first section of the ejection opening at a first longitudinal side of the housing and via a second section of the ejection opening at the front side of the housing. Preferably, the second section of the ejection device has a minimum width measured perpendicularly to the longitudinal plane of the guide rail in the direction of the longitudinal center axis when viewing the front side of the work tool. The minimum width of the second section of the ejection opening corresponds to at least 10%, preferably at least 20%, preferably at least 30% of the width of the housing at the front side measured perpendicularly to the longitudinal plane of the guide rail. In particular, the minimum width of the second section of the ejection opening is not greater than 50% of the width of the housing at the front side.
[0013] Particularly preferably, the work tool has an additional ejection opening, wherein the additional ejection opening is preferably formed on the underside of the housing. As a result, a large amount of sawdust conveyed by the saw chain into the sprocket space can already be ejected into the external environment through the additional ejection opening, preferably also in the area of the load return section.
[0014] In particular, it is provided that the drive motor is an electric motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The following is an explanation of the embodiments of the present invention based on the accompanying drawings.
[0016] Figure 1 An embodiment of a work tool according to the invention is shown in a perspective view, the work tool having an ejection opening with a first section at a first longitudinal side of the housing and a second section at the front side of the housing,
[0017] Figure 2 The side view shows the Figure 1 working tools,
[0018] Figure 3 A partial side view shows the Figure 1 an ejection opening of the working tool for chip removal,
[0019] Figure 4 The previous view shows that Figure 1 working tools,
[0020] Figure 5 The bottom view shows the Figure 1 A working tool having a further ejection opening for chip removal, and
[0021] Figure 6 The top view shows the Figure 1 working tools. DETAILED DESCRIPTION
[0022] exist Figure 1 , an embodiment of a portable hand-held working tool 1 according to the invention is shown. The term "portable" is to be understood in such a way that the working tool 1 is carried by the operator during the prescribed operation of the working tool 1. In this embodiment, the working tool 1 is configured as a wood cutter. The wood cutter is preferably configured for cutting branches and small wood. The preferred use of the wood cutter is in particular the delimbing of trees. The working tool 1 can also be configured as a motor chain saw. In an alternative embodiment, the working tool 1 can also have a handle and be configured, for example, as a high branch pruner, a tree maintenance saw, etc.
[0023] The work tool 1 comprises a housing 2. The work tool 1 comprises a drive motor 3. The drive motor 3 is arranged in the housing 2. In addition, the work tool 1 comprises a saw chain 6. The saw chain 6 is driven by the drive motor 3. The saw chain 6 is driven in a guide groove of a guide rail 4. The drive motor 3 drives a drive sprocket (not shown in detail) via its drive shaft, which in turn drives the saw chain 6 in a direction of operation 33 around the guide rail 4. The housing 2 comprises a base housing 7 and a sprocket cover 8. The sprocket cover 8 is arranged on the base housing 7 and covers the drive sprocket.
[0024] As in Figure 1 and Figure 2 , the guide rail has a deflection region 34 facing away from the housing 2. The saw chain 6 has a first return section 35, a so-called load return section, which moves from the deflection region 34 to the drive sprocket in the running direction 33. The saw chain 6 has a second return section 36, a so-called unloaded return section, which moves from the drive sprocket to the deflection region 34.
[0025] As in Figure 2 As shown in , the drive motor 3 is configured as an electric motor in this embodiment. The work tool 1 includes in particular at least one first battery pack 41, which is only schematically shown. The first battery pack 41 is configured to supply the drive motor 3 with electrical energy. The work tool 1 includes in particular a second battery pack 42, which is only schematically shown. The second battery pack 42 is configured to supply the drive motor 3 with electrical energy. The work tool 1, in particular the drive motor 3 of the work tool 1, can also be operated in particular only via one of the two battery packs 41, 42. In this embodiment, the two battery packs 41, 42 are connected in series in particular. In an alternative design of the work tool 1, the drive motor 3 can also be configured as an internal combustion engine.
[0026] As in Figure 2 and Figure 3As shown in , the guide rail 4 includes a longitudinal center axis 5. In addition, the work tool 1 includes a longitudinal plane 31 unfolded by the guide groove of the guide rail 4. The longitudinal center axis 5 of the guide rail 4 is located in the longitudinal plane 31. The longitudinal center axis 5 extends centrally through the guide rail 4, whereby the guide rail 4 is divided into approximately two equally large parts by the longitudinal center axis 5 in the viewing direction perpendicular to the longitudinal plane 31 of the guide rail 4. In addition, the guide rail 4 includes a transverse plane 32. The transverse plane 32 is oriented orthogonally to the longitudinal plane 31 of the guide rail 4. The longitudinal center axis 5 is located in the transverse plane 32.
[0027] As in Figure 2 As shown in FIG. 1 , the housing 2 of the work tool 1 includes a front end 43 and a rear end 44. The front end 43 corresponds to the front side 10 of the housing 2. The guide rail 4 is fixed to the housing 2 and extends from the housing 2 at the front side 10. The rear end 44 corresponds to the rear side 11 of the housing 2. In this embodiment, the rear end 44 is formed by the battery pack 41, 42. In an alternative embodiment, the rear end 44 can also be formed by the hand grip of the work tool 1. The housing 2 has a first longitudinal side 12 and a second longitudinal side 13 ( Figures 4 to 6 The first longitudinal side 12 and the second longitudinal side 13 are connected to each other via the front side 10 and the rear side 11 of the housing 2 .
[0028] As in Figure 2 As shown in FIG. 4 , the housing 2 has an upper side 14 and a lower side 15 . The first longitudinal side 12 and the second longitudinal side 13 are connected to each other via the upper side 14 and the lower side 15 . The first longitudinal side 13 and the second longitudinal side 14 extend substantially in the direction of the longitudinal plane 31 of the guide rail 4 .
[0029] The terms “upper” and “lower” refer to an orientation of the work tool 1 in which the longitudinal center axis 5 of the guide rail 4 lies in a horizontal plane 45 and the longitudinal plane 31 of the guide rail 4 is oriented perpendicular to the horizontal plane 45 . Figure 2 . In this orientation, the first run 35 of the saw chain 6 is arranged on the longitudinal lower side 17 of the guide rail 4, and the second run 36 of the saw chain 6 is arranged on the longitudinal upper side 16 of the guide rail 4. The viewing direction of the longitudinal upper side 16 of the guide rail 4 naturally also corresponds to the viewing direction of the upper side 14 of the housing 2. Figure 6 Such a viewing direction is shown in FIG. The viewing direction for the longitudinal underside 17 of the guide rail 4 also corresponds to the viewing direction for the underside 15 of the housing 2. For example, in Figure 5 Such a viewing direction is shown in .
[0030] As in Figure 1 and Figure 2As shown in , the work tool 1 includes a first handle 47 for supporting one hand of the operator. The first handle 47 is configured at a handle housing 49. The handle housing 49 is a part of the housing 2. The work tool 1 includes a control element 50 for operating the drive motor 3. The control element 50 is assigned to the first handle 47, that is, in the prescribed operation of the work tool 1, the operator operates the control element 50 with the hand placed on the first handle 47. The work tool 1 includes a preferably mechanical locking element 51. The locking element 51 is preferably configured as a locking rod. The locking element 51 is configured so that the control element 50 is preferably mechanically locked in the locking position and released in the operating position. If the operator wants to operate the control element 50, the operator must first unlock the control element 50 by operating the locking element 51. Subsequently, the operator can operate the control element 50 and operate the drive motor 3.
[0031] As in Figure 1 and Figure 2 As shown in FIG, the power tool 1 includes a second handle 48 in addition to the first handle 47. The second handle 48 is used to support the second hand of the operator and enables the operator to better guide the power tool 1. The second handle 48 is arranged on the housing 2, in particular in the area of the drive motor 3.
[0032] As in Figure 1 As shown in FIG. 1 , the work tool 1 comprises a fixing device 37 for fastening a guide rail 4. In the operating state of the fixing device 37, the guide rail 4 is held clamped on the housing 2. In the loosened state of the fixing device 37, the guide rail 4 can be moved relative to the housing 2 in the direction of the longitudinal center axis 5. The guide rail 4 can be pushed away from the housing 2 in the direction of its longitudinal center axis 5, whereby the saw chain 6 can be tensioned. The sprocket cover 8 is part of the fixing device 37. In the fixed state of the fixing device 37, the guide rail 4 is held clamped between the sprocket cover 8 and the basic housing 7. In order to fasten the sprocket cover 8 to the housing 2, a nut 38 is provided. The nut 38 can be screwed onto a bolt 39, which is firmly connected to the housing 2. In this case, the sprocket cover 8 is pressed against the guide rail 4 via the nut 38, and the guide rail 4 is pressed against the basic housing 7. The sprocket cover 8 covers a sprocket driven by the drive motor 3. The sprocket cover 8 is arranged in particular on the first longitudinal side 12 of the housing 2.
[0033] As in Figure 1 and Figure 2As shown in FIG. 1 , the work tool 1 comprises an ejection opening 20 for ejecting sawdust from the sprocket space 9 into the external environment 30. The sprocket space 9 is bounded by a basic housing 7 and a sprocket cover 8. The ejection opening 20 is formed as a through opening in the housing 2, in particular in the sprocket cover 8, whereby the sawdust can reach the external environment 30 from the sprocket space 9 via the ejection opening 20. The drive sprocket is arranged in the sprocket space 9. The saw chain 6 enters the sprocket space in the region of the first return section 35, is deflected via the drive sprocket, and then exits the sprocket space 9 in the region of the second return section 36 to the external environment 30.
[0034] As in Figure 1 and Figure 2 , the ejection opening 20 is at least partially formed on the first longitudinal side 12 of the housing 2, whereby the chips are transported from the sprocket space 9 via the first longitudinal side 12 of the housing 2. The ejection opening 20 is arranged in the region of the second return section 36. In other words, the ejection opening 20 is in the region in which the saw chain 6 of the guide rail 4 runs out of the housing 2.
[0035] Furthermore, the ejection opening 20 is arranged in the region of the longitudinal upper side 16 of the guide rail 4. In an alternative embodiment, the ejection opening is arranged in the region of the first return section 35, ie in the region of the longitudinal lower side 17 of the guide rail 4.
[0036] In this embodiment of the work tool 1, as in Figure 5 , an additional ejection opening 40 is provided. The additional ejection opening 40 is arranged on the lower side 15 of the housing 2, in particular the sprocket cover 8. Thus, chips can be ejected downward from the sprocket space 9 through the additional ejection opening 40. The additional ejection opening 40 is formed in the region of the first return section 35. In other words, the additional ejection opening 20 is located in the region below the guide rail into which the saw chain 6 runs in the sprocket space toward the drive sprocket. In this embodiment, the additional ejection opening 40 is formed only on the lower side 15 of the housing 2. In an alternative embodiment of the work tool 1, it can also be provided that the additional ejection opening 40 is at least partially, in particular completely, formed on the first longitudinal side 12 of the housing 2.
[0037] As in Figure 1As shown in FIG. 1 , the ejection opening 20 has a first section 21 and a second section 22. The first section 21 of the ejection opening 20 is formed at the first longitudinal side 12 of the housing 2. The second section 22 is formed at the front side 10 of the housing 2. In this exemplary embodiment, the first section 21 and the second section 22 merge directly into each other, so that the two sections 21, 22 form a single opening, namely the ejection opening 20. The saw chain 6 is guided outward from the sprocket space 9 via the second section 22 of the ejection opening 20. The ejection opening 20 is substantially formed by a recess 23 at the sprocket cover 8. In a preferred exemplary embodiment, the first section 21 of the ejection opening 20 is formed only by the recess 23 of the sprocket cover 8. The second section 22 of the ejection opening 23 is at least partially formed by the recess 23 of the sprocket cover 8. The second section 22 of the ejection opening 23 is also at least partially formed by a recess at the front side 10 of the basic housing 7.
[0038] As in Figure 3 As shown in , the first section 21 of the ejection opening 20 has a substantially rectangular contour in the viewing direction of the sprocket cover 8 perpendicular to the longitudinal plane 31. In other words, the first section 21 of the ejection opening 20 has a rectangular contour in the projection onto the longitudinal plane 31 in the direction of the sprocket cover perpendicular to the longitudinal plane 31. Alternatively, other contours that form a sufficiently large opening for chip discharge can also be conceived. The first section 21 has a height h measured parallel to the longitudinal plane 31 and perpendicular to the longitudinal center axis 5 of the guide rail 4. In other words, the height h is measured perpendicular to the transverse plane 32. The height h of the first section 21 of the ejection opening 20 is at least 5 mm, in particular at least 7.5 mm, preferably at least 10 mm. The height h of the first section 21 of the ejection opening 20 corresponds to the distance between the lower edge 61 of the ejection opening 20 and the upper edge 62 of the ejection opening 20. In this embodiment, the lower edge 61 of the ejection opening 20 is formed by the sprocket cover 8. In this embodiment, the upper edge 62 is constructed at the base housing 7. The ejection opening 20 is thus bounded upward by the housing 2. In this exemplary embodiment, the work tool, which is designed as a wood cutting machine 1, comprises a lubricant tank which forms an upper edge 62 of the ejection opening 20. The lubricant tank is part of the housing 2, in particular of the base housing 7. The ejection opening 20 is thus bounded upward by the lubricant tank.
[0039] As in Figure 3, the first section 21 of the ejection opening 20 extends in the direction of the longitudinal center axis 5 from a first end 24 to a second end 25. The first end 24 is formed at the front end 43 of the housing 2, i.e., at the front side 10 of the housing 2. The second end 25 of the section 21 is formed by a vertical edge 27 of the recess 23 of the sprocket cover 8. The first section 21 of the ejection opening 20 has a length l measured in the direction of the longitudinal center axis 5, which corresponds to the distance between the first end 24 of the first section 21 and the second end 25 of the first section 21. In this embodiment, the length l of the first section 21 of the ejection opening 20 is greater than the height h of the first section 21 of the ejection opening 20. The length l of the first section 21 is at least 10 mm, preferably at least 15 mm.
[0040] As in Figure 3 As shown in FIG. 1 , the housing 2, in particular the sprocket cover 8, has a cover region 28 between a first end 24 of the first section 21 and a second end 25 of the first section 21. In the cover region 28, the saw chain 6 is covered by the housing 2, in particular the sprocket cover 8, in a viewing direction perpendicular to the longitudinal plane 31 of the guide rail 4. In the cover region 28, the lower edge 61 of the first section 21 of the ejection opening 20 is formed above the longitudinal upper side 16 of the guide rail 4, in particular above the saw chain 6, in a viewing direction perpendicular to the longitudinal plane 31 of the sprocket cover 8. The ejection opening 20 has a height h1 in the cover region 28 of the first section 21, measured parallel to the longitudinal plane 31 and perpendicular to the longitudinal center axis 5 of the guide rail 4. In other words, the height h1 of the ejection opening 20 in the cover region 28 is measured perpendicular to the transverse plane 32. The height h1 of the ejection opening 20 in the cover region 28 is at least 5 mm, in particular at least 7.5 mm, preferably at least 10 mm. The height h1 of the ejection opening 20 in the covering region 28 is at most 30 mm, in particular at most 20 mm, also in particular at most 15 mm.
[0041] As in Figure 3As shown in FIG. 1 , the housing 2, in particular the sprocket cover 8, has an open area 29 between the first end 24 of the first section 21 and the second end 25 of the first section 21. The open area 29 is formed by a further recess 26 of the sprocket cover 8. In the open area 29, the saw chain 6 is exposed through the further recess 26 of the sprocket cover 8 in the viewing direction of the sprocket cover 8 perpendicular to the longitudinal plane 31 of the guide rail 4. In the open area 29, the lower edge 61 of the first section 21 of the ejection opening 20 is formed below the upper side 18 of the saw chain 6 facing away from the guide rail 4 in the viewing direction of the sprocket cover 8 perpendicular to the longitudinal plane 31. In this embodiment, the open area 29 starts directly at the front side 10 of the housing 2, in particular the sprocket cover 8. The open area 29 extends from the front side 10 of the housing 2 over a length b measured in the direction of the longitudinal center axis 5 of the guide rail 4 to the covering area 28. The length b of the open area 29 is in particular less than 5 mm. In an alternative embodiment of the power tool 1 , no further recess 26 is provided. In such an embodiment, the housing 2 , in particular the sprocket cover 8 , does not comprise an open region 29 , but only a covered region 28 .
[0042] As in Figure 3 , the ejection opening 20 is designed such that, in a viewing direction perpendicular to the longitudinal plane 31 of the guide bar 4 on the sprocket cover 8, the saw chain 6 is covered by the housing 2, in particular by the sprocket cover 8, between the first end 24 and the second end 25 of the first section 21 of the ejection opening 20 over at least 50%, in particular at least 65%, preferably at least 80% of the length l of the first section 21 of the ejection opening 20. Thus, the length c of the covering region 28 measured in the direction of the longitudinal center axis 5 of the guide bar 4 is at least 50%, in particular at least 65%, preferably at least 80% of the length l of the first section 21 of the ejection opening 20. In the covering region, the spacing d between the lower edge 61 of the ejection opening 20 in the first section 21 and the upper side 18 of the saw chain 6 is at least 1 mm, preferably at least 2 mm, in particular at least 3 mm.
[0043] As in Figure 4As shown in , the second section 22 of the ejection opening 20 has a minimum width b measured perpendicularly to the longitudinal plane 31 of the guide rail 4 in the direction of the longitudinal center axis 5 in the viewing direction of the front side 10 of the work tool 1. The minimum width b is at least 10%, preferably at least 20%, preferably at least 30% of the width a of the housing 2 measured perpendicularly to the longitudinal plane 31 of the guide rail 4 at the front side 10 in the region of the ejection opening 20. The width a of the housing 2 corresponds to the spacing between the first longitudinal side 12 and the second longitudinal side 13 at the front side 10 of the housing 2 in the region of the ejection opening 20. The minimum width b of the second section 22 of the ejection opening 20 is at least 10 mm, preferably at least 12.5 mm, in particular at least 15 mm. The height e of the second section 22 of the ejection opening 20 measured perpendicularly to the transverse plane 32 is at least 10 mm, preferably at least 15 mm, in particular at least 20 mm.
[0044] As in Figure 5 and Figure 6 As shown in FIG. 6 , the housing 2 tapers in the region of the ejection opening 20 toward the front side 10 of the housing 2. The housing 2 has, in particular, a taper 63 in the region of the ejection opening 20. The housing 2 tapers conically in the region of the ejection opening 20 in the direction of the front side 10 of the housing 2. The further recess 26 in the first section 21 of the ejection opening 20 at the first end 24 of the ejection opening 20 leads to an increase in the minimum width b of the second section 22 of the ejection opening 20 ( Figure 4 ).
Claims
1. A portable working tool, It includes: A housing (2), a drive motor (3) arranged in the housing (2), a guide rail (4) having a longitudinal center axis (5), and a saw chain (6), wherein the drive motor (3) drives the saw chain (6) guided in a guide groove of the guide rail (4) in a circumferential manner via a drive sprocket, wherein a longitudinal plane (31) of the guide rail (4) is extended by the guide groove, The housing (2) comprises a base housing (7) and a sprocket cover (8), wherein the base housing (7) and the sprocket cover (8) limit a sprocket space (9). The housing (2) comprises a front side (10) and a rear side (11), wherein the guide rail (4) protrudes from the housing (2) at the front side (10), The housing (2) has a first longitudinal side (12) and a second longitudinal side (13), and the front side (10) and the rear side (11) of the housing (2) are connected via the first longitudinal side and the second longitudinal side. In particular, the housing (2) has an upper side (14) and a lower side (15), A discharge opening (20) is formed on the housing (2) for discharging sawdust from the sprocket space (9) into the external environment (30). Characterized in that the ejection opening (20) has a first section (21), which is configured at a first longitudinal side (12) of the portable work tool (1) and has a height (h) measured parallel to the longitudinal plane (31) and perpendicular to the longitudinal center axis (5) of the guide rail (4), wherein the height (h) is at least 5 mm.
2. The portable working tool according to claim 1, It is characterized in that The ejection opening (20) is at least partially formed by a recess (23) in the sprocket cover (8).
3. The portable working tool according to claim 1, It is characterized in that The guide rail (4) has a longitudinal upper side (16) and a longitudinal lower side (17) lying opposite to a longitudinal center axis (5) of the longitudinal upper side (16), wherein the ejection opening (20) is arranged in the region of the longitudinal upper side (16) of the guide rail (4).
4. The portable working tool according to claim 1, It is characterized in that The first section (21) of the ejection opening (20) has a length (l) measured in the direction of the longitudinal center axis (5) which is greater than the height (h) of the ejection opening (20).
5. The portable working tool according to claim 4, It is characterized in that The ejection opening (20) is designed such that a first section (21) of the ejection opening (20) extends in the direction of the longitudinal center axis (5) of the guide rail (4) from a first end (24) to a second end (25), wherein the ejection opening (20) is designed such that in a viewing direction perpendicular to a longitudinal plane (31) of the guide rail (4) toward the sprocket cover (8), the saw chain (6) is covered by a covering area (28) of the housing (2) over at least 50% of the length (1) of the first section (21) of the ejection opening (20) between a first end (24) and a second end (25) of the first section (21) of the ejection opening (20).
6. The portable working tool according to claim 5, It is characterized in that The covering area (28) protrudes beyond the saw chain (6) by at least 1 mm in a direction extending away from the longitudinal center axis (5) of the guide rail (4) and parallel to a longitudinal plane (31) of the guide rail (4).
7. The portable working tool according to claim 5, It is characterized in that In the region of the ejection opening (20), the housing (2) tapers in the direction of the front side (10) of the housing (2), wherein in a first section (21) of the ejection opening (20) at a first end (24) of the ejection opening (20) a further recess (26) in the housing (2) is provided, which exposes the saw chain (6) in a viewing direction perpendicular to a longitudinal plane (31) of the guide rail (4) towards the sprocket cover (8).
8. The portable working tool according to claim 1, It is characterized in that The ejection opening (20) comprises a second section (22) which is formed on the front side (10) of the housing (2).
9. The portable working tool according to claim 8, It is characterized in that In the viewing direction of the front side (10) of the portable work tool (1) in the direction of the longitudinal center axis (5), the second section (22) of the ejection opening (20) has a minimum width (b) measured perpendicularly to the longitudinal plane (31) of the guide rail (4), which corresponds to at least 10% of the width (a) of the housing (2) at the front side (10) measured perpendicularly to the longitudinal plane (31) of the guide rail (4).
10. The portable working tool according to claim 1, It is characterized in that The portable work tool (1) has a further ejection opening (40), wherein the further ejection opening (40) is preferably formed on the underside (15) of the housing (2).
11. The portable working tool according to claim 1, It is characterized in that The drive motor (3) is an electric motor.