Portable work device

Abstract

The invention relates to a portable work device comprising a housing (2), a drive motor (3) arranged in the housing (2), a guide rail (4) with a longitudinal central 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) via a drive sprocket, wherein a longitudinal plane (31) of the guide rail (4) is spanned by the guide groove, wherein an ejection opening (20) for ejecting sawdust from the sprocket space (9) into the external environment (30) is formed on the housing (2), wherein the ejection opening (20) has a first section (21) which is formed on the first longitudinal side (12) of the motor chainsaw (1) and has a height (h) measured parallel to the longitudinal plane (31) and perpendicular to the longitudinal central axis (5) of the guide rail (4), wherein the height (h) is at least 5 mm.

Description

[0001] The invention relates to a portable working device of the type specified in the preamble of claim 1.

[0002] Portable tools, such as power chainsaws, are known to have an ejection opening for removing chips from the sprocket housing into the surrounding area. Such ejection openings are typically located on the underside of the portable tool, i.e., below the load side of the saw chain. Furthermore, such a tool also includes an ejection opening on the front of the tool. The saw chain is guided from the sprocket housing into the surrounding area via the ejection opening located on the front.

[0003] The invention is based on the object of creating a portable working device of the generic type which allows good chip removal.

[0004] This object is achieved by a portable working device having the features of claim 1.

[0005] The portable work device according to the invention comprises a housing, a drive motor arranged in the housing, a guide rail with a longitudinal central axis and a saw chain, wherein the drive motor drives the saw chain guided in a guide groove of the guide rail via a drive sprocket, a longitudinal plane of the guide rail being 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 protrudes from the housing at the front side, wherein the housing has a first longitudinal side and a second longitudinal side, via which the front and the rear of the housing are connected, wherein in particular the housing has a top side and a bottom side,wherein an ejection opening for ejecting sawdust from the sprocket space into the outside environment is formed on the housing, wherein the ejection opening has a first section formed on the first longitudinal side of the portable 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, when projected in the direction perpendicular to the longitudinal plane onto the longitudinal plane of the guide rail, is at least 5 mm, in particular at least 7.5 mm, preferably at least 10 mm.

[0006] It has been shown that the ejection opening on the side of the housing allows for particularly good chip removal. This is particularly advantageous for portable tools with short guide rails, such as wood pruners. With such tools, the operator often uses the entire length of the guide rail, plunging its entire length into the workpiece. If the front of the housing hits the workpiece, this can lead to the ejection opening on the front of the housing becoming blocked. Optimal chip removal is no longer possible. The ejection opening on the side means that the chips can be conveyed outside through the ejection opening even when the front of the wood pruner is resting against the workpiece. Furthermore, the lateral arrangement of the ejection opening has also proven particularly advantageous for longitudinal cuts in wood.The sawdust that forms during longitudinal cuts is particularly long, making it difficult to remove. The ejection opening located on the side of the housing has proven particularly advantageous in this case.

[0007] In particular, it is provided that the ejection opening is at least partially formed by a recess in the sprocket cover. Thus, the chips are removed from the sprocket space into the outside environment, in particular via the sprocket cover. In particular, it is provided that the guide bar has a longitudinal upper side and a longitudinal lower side opposite the longitudinal upper side with respect to the longitudinal center axis, wherein the ejection opening is arranged in the region of the longitudinal upper side of the guide bar. Thus, the ejection opening is arranged on the slack 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 that is greater than the height of the ejection opening. The first section of the ejection opening is, in particular, substantially rectangular in shape when viewed toward the sprocket cover, perpendicular to the longitudinal plane of the guide rail. Thus, the first section of the ejection opening is sufficiently large to allow the ejection of chips over the longitudinal side of the housing. In an alternative embodiment, the ejection opening can also have a shape; for example, the ejection opening can open in the shape of a triangle toward the guide rail.

[0009] It is provided in particular that the ejection opening is designed such that the 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 such that, when viewed towards the chain wheel cover perpendicular to the longitudinal plane of the guide rail, the saw chain between the first end and the second end of the first section of the ejection opening is covered over at least 50%, in particular over at least 65%, in particular over at least 80% of the length, very particularly over the complete extension of the first section of the ejection opening by the housing, in particular by the chain wheel cover.

[0010] In particular, it is provided that the cover area projects beyond the saw chain by at least 1.0 mm in the direction away from the longitudinal center axis of the guide rail, perpendicular to the longitudinal center axis of the guide rail, and parallel to the longitudinal plane of the guide rail. In other words, in a projection view, the cover area projects beyond the saw chain by at least 1.0 mm in the direction away from the longitudinal center axis of the guide rail, perpendicular to the longitudinal plane of the guide rail.

[0011] In particular, it is provided that in the area of ​​the ejection opening the housing tapers, in particular conically, towards the front 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 when viewed towards the sprocket cover perpendicular to the longitudinal plane of the guide bar. The conical design of the housing towards the front of the housing enables a slim design of the housing at the front. This ensures high accessibility to the workpiece by the work tool. This is particularly advantageous when limbing trees. The further recess enlarges the ejection opening, in particular at the front of the housing. This compensates for the narrowing of the ejection opening resulting from the conicity of the housing towards the front.The ejection opening is therefore large enough to ensure sufficient chip ejection.

[0012] It is advantageously provided that the ejection opening comprises a second section which is formed on the front of the housing. The chips can thus exit the sprocket space via the first section of the ejection opening on the first longitudinal side of the housing and via the second section of the ejection opening on the front of the housing. The second section of the ejection device preferably has a minimum width measured perpendicular to the longitudinal plane of the guide rail in the direction of the longitudinal center axis, as viewed towards the front of the implement. The minimum width of the second section of the ejection opening corresponds to at least 10%, preferably at least 20%, more preferably at least 30% of the width of the housing at the front, measured perpendicular to the longitudinal plane of the guide rail. The minimum width of the second section of the ejection opening is in particular not greater than 50% of the width of the housing at the front.

[0013] Particularly preferably, the implement has a further ejection opening, wherein the further ejection opening is preferably formed on the underside of the housing. This allows a large number of sawdust transported into the sprocket space by the saw chain to be ejected into the outside environment through the further ejection opening, preferably still in the area of ​​the load strand.

[0014] In particular, it is intended that the drive motor is an electric motor.

[0015] An embodiment of the invention is explained below with reference to the drawings. They show: Fig. 1 shows a perspective view of an embodiment of the working device according to the invention with an ejection opening with a first section on the first longitudinal side of the housing and with a second section on the front of the housing, Fig. 2 in a side view the working device according to Fig. 1, Fig. 3 in a partial side view of the ejection opening for chip removal of the working device according to Fig. 1, Fig. 4 in a view from the front the working device Fig. 1, Fig. 5 in a representation from below the working device according to Fig. 1 with an additional ejection opening for chip removal and Fig. 6 in a view from above the working device Fig. 1.

[0016] In Fig. 1 shows an embodiment of a portable, hand-held working device 1 according to the invention. The term "portable" is to be understood such that, during normal operation of the working device 1, the working device 1 is carried by the operator. In the exemplary embodiment, the working device 1 is designed as a brush cutter. A brush cutter is preferably intended for cutting branches and small woody plants. A preferred use for a brush cutter is, in particular, the removal of branches from trees. The working device 1 can also be designed as a power chainsaw. In an alternative embodiment, the working device 1 can also have a shaft and be designed, for example, as a pole pruner, a tree care saw, or the like.

[0017] The working device 1 comprises a housing 2. The working device 1 comprises a drive motor 3. The drive motor 3 is arranged in the housing 2. The working device 1 further comprises a saw chain 6. The saw chain 6 is driven by the drive motor 3. The saw chain 6 is driven in rotation 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 rotation around the guide rail 4 in a running direction 33. 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.

[0018] As in the Fig. 1 and Fig. As shown in Figure 2, the guide bar has a deflection area 34 facing away from the housing 2. The saw chain 6 has a first strand 35, a so-called load strand, which moves in the running direction 33 from the deflection area 34 to the drive sprocket. The saw chain 6 has a second strand 36, a so-called slack strand, which moves from the drive sprocket to the deflection area 34.

[0019] As in Fig. 2, the drive motor 3 is designed as an electric motor in the exemplary embodiment. The working device 1 comprises, in particular, at least one first battery pack 41, which is only shown schematically. The first battery pack 41 is provided for supplying the drive motor 3 with electrical energy. The working device 1 comprises, in particular, a second battery pack 42, which is only shown schematically. The second battery pack 42 is provided for supplying the drive motor 3 with electrical energy. The working device 1, in particular the drive motor 3 of the working device 1, can, in particular, also be operated using just one of the two battery packs 41, 42. In the exemplary embodiment, the two battery packs 41, 42 are, in particular, connected in series. In an alternative embodiment of the working device 1, the drive motor 3 can also be designed as an internal combustion engine.

[0020] As in the Fig. 2 and Fig. 3, the guide rail 4 comprises a longitudinal central axis 5. Furthermore, the working device 1 comprises a longitudinal plane 31 spanned by the guide groove of the guide rail 4. The longitudinal central axis 5 of the guide rail 4 lies in the longitudinal plane 31. The longitudinal central axis 5 runs centrally through the guide rail 4, whereby the guide rail 4, viewed perpendicular to the longitudinal plane 31 of the guide rail 4, is divided into two approximately equal parts by the longitudinal central axis 5. Furthermore, the guide rail 4 comprises a transverse plane 32. The transverse plane 32 is aligned orthogonally to the longitudinal plane 31 of the guide rail 4. The longitudinal central axis 5 lies in the transverse plane 32.

[0021] As in Fig. 2, the housing 2 of the working device 1 comprises a front end 43 and a rear end 44. The front end 43 corresponds to a front side 10 of the housing 2. The guide rail 4 is fixed to the housing 2 and protrudes from the front side 10 of the housing 2. The rear end 44 corresponds to the rear side 11 of the housing 2. The rear end 44 is formed by the battery packs 41, 42 in the present embodiment. In an alternative embodiment, the rear end 44 can also be formed by a handle of the working device 1. The housing 2 has a first longitudinal side 12 and a second longitudinal side 13 ( Fig. 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.

[0022] As in Fig. As shown in Figure 2, the housing 2 has a top side 14 and a bottom side 15. The first longitudinal side 12 and the second longitudinal side 13 are connected to each other via the top side 14 and the bottom 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.

[0023] The terms “top” and “bottom” refer to an orientation of the working device 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 aligned perpendicular to the horizontal plane 45. Such an orientation of the working device 1 is in Fig. 2. In this orientation, the first strand 35 of the saw chain 6 is arranged on a longitudinal underside 17 of the guide bar 4 and the second strand 36 of the saw chain 6 is arranged on a longitudinal upper side 16 of the guide bar 4. The viewing direction onto the longitudinal upper side 16 of the guide bar 4 naturally also corresponds to the viewing direction onto the upper side 14 of the housing 2. Such a viewing direction is shown in Fig. 6. The viewing direction of the longitudinal underside 17 of the guide rail 4 also corresponds to the viewing direction of the underside 15 of the housing 2. Such a viewing direction is shown, for example, in Fig. 5 shown.

[0024] As in the Fig. 1 and Fig. 2, the working device 1 comprises a first handle 47 for supporting a hand of the operator. The first handle 47 is formed on a handle housing 49. The handle housing 49 is part of the housing 2. The working device 1 comprises a control element 50 for actuating the drive motor 3. The control element 50 is assigned to the first handle 47, i.e., during normal operation of the working device 1, the operator actuates the control element 50 with the hand resting on the first handle 47. The working device 1 comprises a, preferably mechanical, locking element 51. The locking element 51 is preferably designed as a locking lever. The locking element 51 is designed to lock the control element 50 in a locked position, preferably mechanically, and to release it in an operating position. If the operator wishes to actuate the control element 50, he must first unlock the control element 50 by actuating the locking element 51.The operator can then operate the control element 50 and control the drive motor 3.

[0025] As in the Fig. 1 and Fig. 2, the working device 1 comprises, in addition to the first handle 47, a second handle 48. The second handle 48 serves to support the operator's second hand and enables the operator to better guide the working device 1. The second handle 48 is provided on the housing 2, in particular in the area of ​​the drive motor 3.

[0026] As in Fig. 1, the working device 1 comprises a fixing device 37 for securing the guide rail 4. In an operating state of the fixing device 37, the guide rail 4 is clamped to the housing 2. In a released state of the fixing device 37, the guide rail 4 is displaceable in the direction of the longitudinal center axis 5 relative to the housing 2. 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 chain wheel cover 8 is part of the fixing device 37. In the fixed state of the fixing device 37, the guide rail 4 is clamped between the chain wheel cover 8 and the base housing 7. A nut 38 is provided for securing the chain wheel cover 8 to the housing 2. The nut 38 is to be screwed onto a bolt 39 which is firmly connected to the housing 2.The nut 38 presses the sprocket cover 8 against the guide rail 4, and the guide rail 4 against the base housing 7. The sprocket cover 8 covers the sprocket driven by the drive motor 3. The sprocket cover 8 is provided in particular on the first longitudinal side 12 of the housing 2.

[0027] As in the Fig. 1 and Fig. 2, the working device 1 comprises an ejection opening 20 for ejecting sawdust from the sprocket space 9 into an external environment 30. The sprocket space 9 is delimited by the base housing 7 and the 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 chips can pass from the sprocket space 9 into the external environment 30 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 strand 35, is deflected via the drive sprocket and then exits the sprocket space 9 back into the external environment 30 in the region of the second strand 36.

[0028] As in the Fig. 1 and Fig. 2, the ejection opening 20 is formed at least partially on the first longitudinal side 12 of the housing 2, whereby the chips are conveyed out of 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 run 36. In other words, the ejection opening 20 is located in the region of the guide rail 4, from which the saw chain 6 exits the housing 2.

[0029] 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 run 35, i.e., in the region of the longitudinal lower side 17 of the guide rail 4.

[0030] In the present embodiment of the working device 1, as shown in Fig. 5, a further ejection opening 40 is provided. The further ejection opening 40 is provided on the underside 15 of the housing 2, in particular of the sprocket cover 8. The chips can thus be ejected downwards through the further ejection opening 40 from the sprocket space 9. The further ejection opening 40 is formed in the region of the first run 35. In other words, the further ejection opening 20 is located in the region of the guide rail, into which the saw chain 6 runs in the sprocket space towards the drive sprocket. In the exemplary embodiment, the further ejection opening 40 is formed only on the underside 15 of the housing 2. In an alternative embodiment of the working device 1, it can also be provided that the further ejection opening 40 is also formed at least partially, in particular completely, on the first longitudinal side 12 of the housing 2.

[0031] As 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 on the first longitudinal side 12 of the housing 2. The second section 22 is formed on the front side 10 of the housing 2. In the exemplary embodiment, the first section 21 and the second section 22 merge directly into one another, whereby the two sections 21, 22 form a single opening, namely the ejection opening 20. The saw chain 6 is guided outwards from the sprocket space 9 via the second section 22 of the ejection opening 20. The ejection opening 20 is essentially formed by a recess 23 in the sprocket cover 8. In the preferred exemplary embodiment, the first section 21 of the ejection opening 20 is formed merely by the recess 23 in 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 at least partially also formed by a recess on the front side 10 of the base housing 7.

[0032] As in Fig. 3, the first section 21 of the ejection opening 20 has a substantially rectangular contour when viewed towards 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 when projected towards the sprocket cover, perpendicular to the longitudinal plane 31, onto the longitudinal plane 31. Other contours that form a sufficiently large opening for the removal of chips are also conceivable as an alternative. 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 a distance between a lower edge 61 of the ejection opening 20 and an upper edge 62 of the ejection opening 20. In the present embodiment, the lower edge 61 of the ejection opening 20 is formed by the sprocket cover 8. The upper edge 62 is formed on the base housing 7 in the present exemplary embodiment. The ejection opening 20 is thus delimited at the top by the housing 2. In the exemplary embodiment, the working device 1 designed as a brush cutter comprises a lubricant tank which forms the 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 delimited at the top by the lubricant tank.

[0033] As in Fig. 3, the first section 21 of the ejection opening 20 extends from a first end 24 in the direction of the longitudinal center axis 5 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 on 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 length 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 the exemplary 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.

[0034] As in Fig. 3, the housing 2, in particular the sprocket cover 8, has a cover area 28 between the first end 24 of the first section 21 and the second end 25 of the first section 21. In the cover area 28, the saw chain 6 is concealed by the housing 2, in particular by the sprocket cover 8, as viewed towards the sprocket cover 8, perpendicular to the longitudinal plane 31 of the guide rail 4. In the cover area 28, the lower edge 61 of the first section 21 of the ejection opening 20 is formed perpendicular to the longitudinal plane 31 above the longitudinal upper side 16 of the guide rail 4, in particular above the saw chain 6, as viewed towards the sprocket cover 8. The ejection opening 20 has a height h1 in the cover area 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 area 28 is measured perpendicular to the transverse plane 32.The height h1 of the ejection opening 20 in the cover area 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 cover area 28 is at most 30 mm, in particular at most 20 mm, most particularly at most 15 mm.

[0035] As in Fig. 3, 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 in 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, as viewed toward 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, as viewed toward the sprocket cover 8, is formed perpendicular to the longitudinal plane 31 below an upper side 18 of the saw chain 6 facing away from the guide rail 4. In the present embodiment, the open area 29 begins directly at the front side 10 of the housing 2, in particular of the sprocket cover 8.The open area 29 extends from the front side 10 of the housing 2 to the cover area 28 over a length b measured in the direction of the longitudinal center axis 5 of the guide rail 4. The length b of the open area 29 is in particular less than 5 mm. In an alternative embodiment of the working device 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 area 29, but merely a cover area 28.

[0036] As in Fig. 3, the ejection opening 20 is designed such that, in the direction of view onto the chain wheel cover 8 perpendicular to the longitudinal plane 31 of the guide rail 4, the saw chain 6 between the first end 24 and the second end 25 of the first section 21 of the ejection opening 20 is covered by the housing 2, in particular by the chain wheel cover 8, over at least 50%, in particular over at least 65%, preferably over at least 80% of the length l of the first section 21 of the ejection opening 20. Accordingly, a length c of the cover area 28 measured in the direction of the longitudinal center axis 5 of the guide rail 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 cover area, the distance 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.

[0037] As in Fig. 4, the second section 22 of the ejection opening 20 has a minimum width b measured perpendicular to the longitudinal plane 31 of the guide rail 4 when viewed towards the front side 10 of the working device 1 in the direction of the longitudinal center axis 5. The minimum width b is at least 10%, preferably at least 20%, more preferably at least 30% of the width a of the housing 2 measured perpendicular to the longitudinal plane 31 of the guide rail 4 on the front side 10 in the region of the ejection opening 20. The width a of the housing 2 corresponds to the distance between the first longitudinal side 12 and the second longitudinal side 13 on 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 perpendicular to the transverse plane 32 is at least 10 mm, preferably at least 15 mm, in particular at least 20 mm.

[0038] As in the Fig. 5 and Fig. 6, the housing 2 tapers in the area of ​​the ejection opening 20 towards the front side 10 of the housing 2. The housing 2 has, in particular, a conicity 63 in the area of ​​the ejection opening 20. The housing 2 tapers conically in the area of ​​the ejection opening 20 towards 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 ( Fig. 4).

Claims

[1] Portable work tool comprehensive a housing (2), a drive motor (3) arranged in the housing (2), a guide rail (4) with a longitudinal central 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) via a drive sprocket, wherein a longitudinal plane (31) of the guide rail (4) is spanned by the guide groove, wherein the housing (2) comprises a base housing (7) and a sprocket cover (8), wherein the base housing (7) and the sprocket cover (8) delimit a sprocket space (9), wherein 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), wherein the housing (2) has a first longitudinal side (12) and a second longitudinal side (13) via which the front (10) and the rear (11) of the housing (2) are connected, wherein in particular the housing (2) has an upper side (14) and a lower side (15), wherein an ejection opening (20) for ejecting sawdust from the sprocket space (9) into the outside environment (30) is formed on the housing (2), characterized by in that the ejection opening (20) has a first section (21) which is formed on the first longitudinal side (12) of the portable working device (1) and has a height (h) measured parallel to the longitudinal plane (31) and perpendicular to the longitudinal central axis (5) of the guide rail (4), wherein the height (h) is at least 5 mm. [2] Portable working device according to claim 1, characterized by that the ejection opening (20) is at least partially formed by a recess (23) on the sprocket cover (8). [3] Portable working device according to claim 1 or 2, characterized bythat the guide rail (4) has a longitudinal upper side (16) and a longitudinal lower side (17) opposite the longitudinal upper side (16) with respect to the longitudinal center axis (5), wherein the ejection opening (20) is arranged in the region of the longitudinal upper side (16) of the guide rail (4). [4] Portable working device according to one of claims 1 to 3, characterized by that the first section (21) of the ejection opening (20) has a length (l) measured in the direction of the longitudinal central axis (5) which is greater than the height (h) of the ejection opening (20). [5] Portable working device according to claim 4, characterized byin that the ejection opening (20) is designed such that the 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, when viewed towards the chain wheel cover (8) perpendicular to the longitudinal plane (31) of the guide rail (4), the saw chain (6) is covered 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 over at least 65%, in particular over at least 80% of the length (l), very particularly over the complete extension of the first section (21) of the ejection opening (20) by a cover region (28) of the housing (2), in particular of the chain wheel cover (8). [6] Portable working device according to claim 5, characterized bythat the cover area (28) projects beyond the saw chain (6) by at least 1 mm in the direction away from the longitudinal center axis (5) of the guide rail, perpendicular to the longitudinal center axis (5) of the guide rail (4) and parallel to the longitudinal plane (31) of the guide rail (4). [7] Portable working device according to claim 5 or 6, characterized by in that in the region of the ejection opening (20) the housing (2) tapers, in particular conically, in the direction of the front side (10) of the housing (2), wherein in the first section (21) of the ejection opening (20) at the first end (24) of the ejection opening (20) a further recess (26) is provided on the housing (2), in particular on the chain wheel cover (8), which, when viewed in the direction of the chain wheel cover (8), exposes the saw chain (6) perpendicular to the longitudinal plane (31) of the guide rail (4). [8] Portable working device according to one of claims 1 to 7, characterized bythat the ejection opening (20) comprises a second portion (22) formed on the front side (10) of the housing (2). [9] Portable working device according to claim 8, characterized by that, when viewed towards the front side (10) of the portable working device (1) in the direction of the longitudinal central axis (5), the second section (22) of the ejection opening (20) has a minimum width (b) measured perpendicular to the longitudinal plane (31) of the guide rail (4), which corresponds to at least 10%, preferably at least 20%, preferably at least 30% of the width (a) of the housing (2) on the front side (10) measured perpendicular to the longitudinal plane (31) of the guide rail (4). [10] Portable working device according to one of claims 1 to 9, characterized by that the portable working device (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] Portable working device according to one of claims 1 to 10, characterized by that the drive motor (3) is an electric motor.

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