阅读说明：本技术 手持式工具机 (Hand-held power tool ) 是由 J·齐格尔 于 2019-12-19 设计创作，主要内容包括：本发明的出发点是手持式工具机、尤其是磨削器(10),其用于同时驱动多个磨削盘(12、14、16)、尤其是能倾翻的、旋转地和/或振荡地和/或随机圆形地被驱动的磨削盘(12、14、16),手持式工具机具有至少一个从动轴壳体(202)和马达壳体(200),所述从动轴壳体与从动轴轴线(42、204、206、208)正交地包围多个、尤其是三个从动轴(40),所述马达壳体(200)与马达轴轴线(30)正交地至少基本上包围马达(26)。提出了,马达壳体(200)的与马达轴轴线(30)正交的在马达壳体(200)的收缩区域(212)中的截面面积(210)小于从动轴壳体(202)的与从动轴轴线(42、204、206、208)正交的在从动轴壳体(202)的扩张区域(216)中的截面面积(214)的70％、尤其是65％、优选55％；和/或,优选三个从动轴轴线(42、204、206、208)中的一个、尤其是两个,尤其是手持式工具机的在后侧的两个从动轴轴线(206、208)处于马达壳体(200)之外、尤其是处于马达壳体(200)的收缩区域(212)之外和/或处于手持式工具机的手柄(24、258)、尤其是在棒状的手柄(24、258)之外、优选处于手柄(24、258)的、马达壳体(200)的和/或手柄(24、258)与马达壳体(200)的过渡区域(276)的尤其是凹形地凹陷的区域(230、278)之外。(The invention relates to a hand-held power tool, in particular a grinder (10), for simultaneously driving a plurality of grinding disks (12, 14, 16), in particular tiltable, rotationally and/or oscillatingly and/or randomly circularly driven grinding disks (12, 14, 16), having at least one output shaft housing (202) which encloses a plurality of, in particular three, output shafts (40) orthogonally to the output shaft axes (42, 204, 206, 208), and having a motor housing (200), which at least substantially encloses the motor (26) orthogonally to the motor shaft axis (30). It is proposed that the cross-sectional area (210) of the motor housing (200) orthogonal to the motor shaft axis (30) in a constricted region (212) of the motor housing (200) is less than 70%, in particular 65%, preferably 55%, of the cross-sectional area (214) of the driven shaft housing (202) orthogonal to the driven shaft axis (42, 204, 206, 208) in an expanded region (216) of the driven shaft housing (202); and/or preferably one, in particular two, of the three output shaft axes (42, 204, 206, 208), in particular the two output shaft axes (206, 208) of the handheld power tool on the rear side, are located outside the motor housing (200), in particular outside the constriction (212) of the motor housing (200), and/or outside the handle (24, 258) of the handheld power tool, in particular outside the rod-shaped handle (24, 258), preferably outside an, in particular concavely recessed region (230, 278) of the handle (24, 258), of the motor housing (200) and/or of a transition region (276) of the handle (24, 258) and the motor housing (200).)

1. Hand-held power tool, in particular a grinder (10), for simultaneously driving a plurality of grinding disks (12, 14, 16), in particular tiltable, rotationally and/or oscillatingly and/or randomly circularly driven grinding disks (12, 14, 16), having at least one output shaft housing (202) which encloses a plurality of output shafts (40), in particular three output shafts (40), orthogonally to the output shaft axes (42, 204, 206, 208) of the output shafts, and having a motor housing (200) which encloses the motor (26) at least substantially orthogonally to the motor shaft axis (30), characterized in that,

the cross-sectional area (210) of the motor housing (200) orthogonal to the motor shaft axis (30) in a particularly constricted region (212) of the motor housing (200) is less than 70%, particularly 65%, preferably 55%, of the cross-sectional area (214) of the driven shaft housing (202) orthogonal to the driven shaft axis (42, 204, 206, 208) in a particularly widened region (216) of the driven shaft housing (202); and/or the presence of a gas in the gas,

preferably, one, in particular two, of the three output shaft axes (42, 204, 206, 208), in particular the two output shaft axes (206, 208) of the handheld power tool on the rear side are located outside the motor housing (200), in particular outside the constricted region (212) of the motor housing (200), and/or outside the handle (24, 258) of the handheld power tool, in particular outside the rod-shaped handle (24, 258), preferably outside an, in particular concavely recessed region (230, 278) of the handle (24, 258), of the motor housing (200) and/or of a transition region (276) of the handle (24, 258) and the motor housing (200).

2. The hand-held power tool according to claim 1, characterized in that a cross-sectional area (214) of the output shaft housing (202) in a region (226) which is in particular on the rear side, preferably in a region of the rear output shaft axis (206 ), is covered by a cross-sectional area (210) of the motor housing (200) which is projected along the motor shaft axis (30), by less than 75%, in particular by less than 50%, preferably by less than 25%.

3. The hand-held power tool according to claim 1 or 2, characterized in that a cross-sectional area (214) of the output shaft housing (202) in the region (228), in particular of the front side, preferably in the region of the front output shaft axis (204), is covered by more than 70%, in particular more than 90%, preferably completely, by a cross-sectional area (210) of the motor housing (200) projected along the motor shaft axis (30).

4. The hand-held power tool according to one of the preceding claims, characterized in that a circumference (211) of the motor housing (200) orthogonal to the motor shaft axis (30) in a particularly constricted region (212) of the motor housing (200) is less than 80%, particularly 70%, of a circumference (215) of the driven shaft housing (202) orthogonal to the driven shaft axis (42, 204, 206, 208) in a particularly expanded region (216) of the driven shaft housing (202).

5. Hand-held power tool according to one of the preceding claims, characterised in that a third, in particular front, output shaft axis (204) of the hand-held power tool is located within the motor housing (200) and/or within the handle (258).

6. Hand-held power tool according to one of the preceding claims, characterized in that the ratio of the height (238, 240) of the hand-held power tool in the direction of the driven shaft axis (42, 204, 206, 208), in particular the height (238) of the motor housing and the driven shaft housing (200, 202), to the length (242) of the substantially rod-shaped handle (24), in particular the length (242) of the rod-shaped handle (24) protruding substantially orthogonally to the motor housing (200) or the drive shaft axis and the driven shaft axis (30, 204), is less than 50%, in particular less than 75%, preferably less than 85%, in particular approximately the same.

7. The hand-held power tool according to one of the preceding claims, characterized in that an overall length (244) of the hand-held power tool, which is orthogonal to the at least one drive or driven shaft axis (30, 42, 204, 206, 208), in particular from an end of the motor housing (200) to an end of the bar-shaped projecting handle (24), in particular from the grinding plate plane (112) to the end of the handle (24) or the end of the motor housing (200), is greater than 10%, in particular greater than 25%, preferably approximately 40%, of a height (238, 240) of the hand-held power tool in at least one direction of the drive or driven shaft axis (30, 42, 204, 206, 208).

8. The hand-held power tool according to one of the preceding claims, comprising a grinding machine housing (250) having at least one housing shell element (252) and at least one further housing shell element (254) connected to the housing shell element (252), which housing shell element and the further housing shell element at least in sections form a handle (24, 258), characterized in that at least one ventilation opening (262), in particular a ventilation slot, is provided, which ventilation opening is formed at least in sections in the region of a separating edge (260) of the housing shell element (252) and the further housing shell element (254), in particular wherein the ventilation opening (262) extends over two regions (264 ) arranged at an angle (268) relative to one another, in particular at an angle (268) between 90 ° and 120 °, preferably between 100 ° and 105 °, 268).

9. The hand-held power tool according to claim 8, characterized in that the housing shell element (252) and the further housing shell element (254) are connected, in particular fixed, to one another, in particular along at least substantially the entire contact line and/or contact surface of the housing shell element (252) and the further housing shell element (254), at least substantially without visible fastening elements.

10. Hand-held power tool according to claim 8 or 9, characterized in that the handle (24, 258) is at least substantially constructed without a separating edge at least on the side of the handle (24, 258) facing the tool side and/or facing away from the tool side.

11. The hand-held power tool according to one of the preceding claims, comprising a grinder housing (250) having a motor housing section (270) and a bar-shaped handle housing section (272), wherein the grinder housing (250) has a concave depression (278) in a transition region (276) between the bar-shaped handle housing section (272) and the motor housing section (270), in particular such that the depression serves as an ergonomic contact surface for a finger, in particular a thumb, of a user.

12. Hand-held power tool according to one of the preceding claims,

the hand-held power tool has a handle housing (68) which forms a handle (24) and which protrudes from the main housing (64) substantially transversely to the main housing (64), in particular in the form of a stick-shaped handle, in particular wherein the handle housing (68) is provided for accommodating a battery (70), in particular a push-in battery (72); and/or the presence of a gas in the gas,

the hand-held power tool comprises: a motor (26) having a drive shaft (28) that specifies a motor axis (30); a centre wheel (34) driven by the motor (26), the centre wheel predefining a centre wheel axis (22); and a plurality of, in particular three, output shafts (40) which are driven by the central wheel (34) and which each specify an output shaft axis (42), wherein each output shaft (40) is provided for driving a respective one of the grinding disks (12, 14, 16) or at least a respective one of the grinding disk receptacles (56), wherein the motor axis (30) is arranged eccentrically with respect to the central wheel axis (22) between the output shaft axis (40) on the front side and the central wheel axis (22).

Technical Field

The invention relates to a hand-held power tool, in particular a grinder, for simultaneously driving a plurality of, preferably three, grinding disks, in particular tiltable, rotatable and/or oscillating and/or randomly round grinding disksThe ground is driven.

Background

Such a hand-held power tool is known, for example, from EP 1466698.

Disclosure of Invention

A hand-held power tool having the features of claim 1 is proposed. Advantageous embodiments, variants and embodiments of the invention emerge from the dependent claims.

The starting point of the invention is a hand-held power tool, in particular a sander, for simultaneously driving a plurality of, preferably three, grinding disks, which are driven, in particular, in a tiltable manner, in rotation and/or in an oscillating manner and/or in a random circular manner, having at least one output shaft housing, which surrounds at least three output shafts orthogonally to the output shaft axis, and a motor housing, which substantially surrounds the motor orthogonally to the motor shaft axis. It is proposed that the cross-sectional area of the motor housing, which is orthogonal to the motor shaft axis, in particular in the constriction region of the motor housing is less than 70%, in particular less than 65%, preferably less than 55%, of the cross-sectional area of the output shaft housing, which is orthogonal to the output shaft axis, in particular in the expansion region of the output shaft housing, in particular in the region of the output shaft housing which expands most. The constriction region is in particular in the region of the motor axis or in the region perpendicular to the motor axis of the motor. A constriction region is to be understood as a region which tapers off, in particular with a minimum cross-sectional area. The visibility of the surface to be machined is advantageously increased. The hand-held power tool can be gripped more easily in different gripping positions. The, in particular rod-shaped, handle extends beyond the grinding disk, so that the force application point is displaced toward the center of the plurality, in particular three, grinding disks. If necessary, the grinder can also be grasped in the region of the constriction and/or the palm can be placed on the driven shaft housing. Thereby, the force application point can be displaced very close to the surface to be ground. There are a plurality of gripping positions, for example gripping on a rod-shaped handle, placing a palm, in particular from above, on the motor housing, gripping in a constricted region of the motor housing and/or placing a palm in the region of the driven shaft housing.

It is provided that the cross-sectional area of the output shaft housing in the rear region of the hand-held power tool is covered by a cross-sectional area of the motor housing, which is projected along the motor shaft axis, by less than 75%, in particular by less than 50%, preferably by less than 25%. The rear region is in particular the region facing the stick-shaped handle of the hand-held power tool. Instead, the front region faces away from the handle in particular. The front side can also be a region corresponding to a preferred direction of movement of the hand-held power tool. The front side can also be the location of the output shaft in the mirror symmetry plane of the hand-held power tool. On the rear side, the two driven shafts are spaced apart from the mirror symmetry plane. Advantageously, the motor housing is arranged asymmetrically with respect to the driven shaft housing. In particular, the motor is arranged asymmetrically with respect to the center of the driven shaft housing, in particular displaced, preferably eccentrically, in the direction towards the front side. Therefore, the motor constitutes a weight of the rod-shaped handle, in particular, preferably a weight of the rod-shaped handle protruding toward the rear side. This can positively influence the position of the center of gravity of the hand-held power tool. The visibility of the grinding disk on the rear side is also improved. This enables the grinder to be better controlled or guided. Undesired damage to elements, for example, vertically adjoining the surface to be ground, can be avoided. Furthermore, this makes it possible to achieve grippability, in particular of the rod-shaped handle on or between the driven shaft housing and the rod-shaped handle. The introduction or guidance of the force of the hand-held power tool can be carried out as close as possible to the grinding disk.

It is proposed that the cross-sectional area of the output shaft housing in the front region of the hand-held power tool is covered by more than 70%, in particular more than 90%, preferably completely, of the cross-sectional area of the motor housing projected along the motor shaft axis. As described above, the center of gravity position, the force application point and/or the balancing of the motor weight with the handle, in particular, which accommodates the battery, is thereby positively influenced.

It is proposed that one, in particular two, of the three output shaft axes, in particular the two output shaft axes on the rear side of the hand-held power tool, be outside the motor housing, in particular outside a constriction region of the motor housing or the constriction region. As a result, the motor housing is very thin relative to the driven shaft housing. The visibility of the article to be ground is improved. The hand-held power tool, in particular a stick-shaped handle, can be gripped better. Additional hand contact surfaces are formed on the driven shaft housing, in particular in the region of the upper portions of the two rear driven shafts.

It is proposed that one, in particular two, of the three output shaft axes, in particular the two output shaft axes of the hand-held power tool on the rear side, lie outside the handle, in particular the bar-shaped handle, preferably outside a recessed region of the handle or a recessed transition region of the handle and the motor housing. This positively influences the force action point or the center of gravity position of the hand-held power tool. The handle and the motor housing can be very compact and/or narrowly embodied.

It is proposed that a third output shaft axis of the hand-held power tool, in particular the output shaft axis on the front side, be located within the motor housing and/or within the handle. Thus, an asymmetry is produced between the motor housing and the output shaft housing or the motor is eccentric with respect to the center of the output shaft housing. As mentioned above, this provides the mentioned advantages.

The invention is based on a grinding machine housing having at least one housing shell element and at least one further housing shell element connected thereto, which at least in sections form a handle, characterized in that at least one ventilation opening, in particular a ventilation slot, is provided, which is formed at least in sections in the region of a separating edge of the housing shell element and the further housing shell element. The ventilation opening extends in particular over two regions which are arranged at an angle relative to one another, in particular at an angle of between 90 ° and 120 °, preferably between 100 ° and 105 °. The lengths of the regions differ in particular by not more than 50%, preferably they are approximately the same. The ventilation openings can be arranged in particular on the right and left side of the aforementioned motor housing. The ventilation openings provide, in particular, the possibility of air intake and exhaust, in particular cooling air and exhaust air of the motor. Cooling air for the motor and/or the electronics of the hand-held power tool can enter through one of the ventilation openings and exit through the other ventilation opening, for example. Furthermore, the ventilation opening can be provided for cooling the hand of the user and/or evaporating sweat potentially generated inside the palm of the hand using the hand-held power tool. This is preferably achieved by means of a region of the ventilation opening which is arranged substantially horizontally and/or in parallel to the orientation of the handle. Thus, user friendliness can be improved.

It is proposed that the housing shell element and the further housing shell element are connected to one another, in particular fixed to one another, at least substantially without visible fastening elements, in particular along at least substantially the entire line of contact and/or contact area of the housing shell element and the further housing shell element. Thereby, screw holes visible from the outside for connecting conventional housing shells are avoided. The aesthetics and ergonomics are improved. The appliance can be cleaned more easily. The interference-causing holes in the region of the gripping surface are omitted.

It is proposed that the handle of the grinder housing is at least substantially free of separating edges at least on the side of the handle facing and/or facing away from the tool. Thereby also improving ergonomics. The assembly of the hand-held power tool is simplified. Visually apparent screw elements can be avoided. The ventilation openings can be integrated into the separating edge, in particular in the lateral direction.

Furthermore, a grinding machine housing is proposed having a motor housing section and a rod-shaped handle housing section, wherein the grinding machine housing has a concave depression, in particular a recess, in the transition region between the rod-shaped handle housing section and the motor housing section. This makes it possible to produce an ergonomic contact surface for the fingers, in particular the thumb, of the user. The grinder shell can be better grasped, the fulcrum is improved, and slipping is prevented. Even in the case of a palm grip of the motor housing, the double-sided concave depression in particular serves as an ergonomic contact surface for the thumb and/or index finger.

Furthermore, a hand-held power tool, in particular a sander, is proposed, which has the aforementioned sander housing.

Drawings

The invention is explained in detail below on the basis of embodiments presented in the drawings. The figures show:

fig. 1 shows a hand-held power tool in a front view;

fig. 2 shows a hand-held power tool in a sectional view a-a;

fig. 3 shows the hand-held power tool in a sectional view B-B;

fig. 4 shows the hand-held power tool in a rest position in a side view;

fig. 5 shows the hand-held power tool in a side view;

fig. 6 shows the hand-held power tool in a rear view;

FIG. 7 shows the suction hood in perspective view;

fig. 8 shows a side view of a system of a hand-held power tool and a suction hood;

fig. 9a to 9d show the hand-held power tool in four views in hatched views;

fig. 10 shows the cross-sectional areas or cross-sectional area ratios of the converging region and the diverging region of the hand-held power tool;

fig. 11 shows a perspective view of a hand-held power tool.

Detailed Description

Fig. 1 shows a hand-held power tool in the form of a grinder 10 in a front view. The grinder 10 is provided for driving three grinding discs 12, 14, 16 simultaneously. One grinding disk 12 on the front side and two grinding disks 14, 16 on the rear side. The grinding disks 12, 14, 16 are mounted pivotably or tiltably by means of a cardan-type or cardan-type suspension of the grinding disks 12, 14, 16 (see fig. 2). The grinding disks 12, 14, 16 are driven in rotation and are also very suitable for grinding crowned surfaces. The grinder 10 can be activated by actuating the switch 18. The marking elements 20 advantageously group such instruments into an instrument product family or a manufacturer.

Fig. 2 shows a hand-held power tool in the form of a grinder 10 in a sectional view a-a through a plane a (see fig. 1). The grinding disk 12 on the front side is arranged in front of the central wheel axis 22. The grinding disk 12 is arranged opposite the handle 24 with respect to the central wheel axis 22. The two rear grinding disks 14, 16, of which only the grinding disk 16 is visible in the illustration, are arranged on the side of the central wheel axis 22 facing the handle 24. The three grinding disks 12, 14, 16 are of identical construction and can be constructed interchangeably. The motor 26 has a drive shaft 28. The motor 26 or its drive shaft 28 defines a motor shaft axis 30. The motor 26 drives a central wheel 34, which specifies the central wheel axis 22, via a drive gear 32. The central wheel 34 is driven by the drive gear 32 via a spur gear 36. The central wheel 34 has a toothing 38, with which it drives three output shafts 40, of which only the front output shaft is visible in the section a-a. These driven shafts 40 in turn define driven shaft axes 42. Each driven shaft 40 is in turn provided for at least indirectly driving the respective grinding disk 12, 14, 16. The central wheel 34 drives three spur gears 44 via the toothed portion 38 (wherein the spur gear 44 driving the grinding disk 12 can be seen in cross section and the spur gear 44 driving the grinding disk 16 can be seen in side view). The spur gear 44 on the front side drives the driven shaft40; such a drive mechanism can be similarly transferred to all spur gears 44 that drive the grinding discs 12, 14, 16. The output shaft 40 is supported in the housing part 60, here by way of example, by at least one deep-groove ball bearing 46. The plain bearing 48 additionally supports the output shaft 40 in a further housing part 62. The two housing portions 60, 62 form a driven shaft housing 202. The driven shaft housing 202, together with the motor housing 200 substantially surrounding the motor 26, constitutes a main housing 64 which accommodates at least the motor 26, the central wheel 34 and the drive and driven shafts 28, 40. The output shaft 40 engages via a driver 50 into a coupling means 52 of the grinding disk 12. The grinding plate 12 can be clamped into the grinding plate holder 56 by means of the latching hooks 54. The grinding disk receptacle 56 is arranged in the region of the opening 100 of the housing part 60. Through the opening 100, the coupling means 52 or the latching hooks 54 of the grinding plate 12 can be inserted into the grinding plate holder 56 or the driver 50. The grinding disk receptacle 56, in addition to enabling low-friction rotational mounting of the grinding disk 12 (here by means of a deep-groove ball bearing 58), also enables pivoting (here by means of a spherical sliding bearing in a spherical receptacle of the housing part 60). The cardan-type drive makes it possible to tilt the grinding disk 12 relative to the housing part 60 or relative to the grinder 10. The central wheel 34 forcibly rotationally drives the grinding disks 12, 14, 16. In principle, however, the oscillating drive or random rounding of the grinding disk 12 Also possible is a drive, for example, by means of a driven shaft 40 which is accommodated eccentrically in a spur gear 44, which driven shaft 40 positively couples or randomly rotates the grinding disks 12, 14, 16, or an eccentric or the like (not shown in detail here), which eccentric generates an oscillating movement by limiting the degrees of freedom of the grinding disks and/or driven shaft.

The drive shaft 28 or the motor shaft axis 30 is arranged eccentrically with respect to the center wheel 34 or the center wheel axis 22. It is arranged between the driven shaft axis 42 on the front side and the central wheel axis 22. The two axes 22, 30 are bisected or lie in the plane a. The motor 26 is displaced in the direction of the grinding disk 12 on the front side or its grinding disk holder 56. The motor 26 or its motor shaft axis 30 is arranged opposite the handle 24 with respect to the center wheel axis 22. The handle 24 is also split centrally by plane a, ideally in a mirror-symmetrical manner. The motor shaft axis 30, the central wheel axis 22 and the driven shaft axis 42 are oriented parallel to one another. The handle axis 66 or the central axis 86 or the longitudinal axis 84 of the bar-shaped handle 24, in particular, is arranged transversely to the central wheel axis 22. The angle alpha is about 45 deg. to 135 deg., and in the present embodiment is about 100 deg.. The handle 24 protrudes from the main housing 64. Plane a or section a-a also extends to some extent from handle axis 66 and central wheel axis 22. The handle 24 is bar-shaped, substantially round or cornerless, etc. The handle 24 is formed by a handle housing 68, which can be constructed at least partially integrally with the main housing 64. The handle 24 is provided for receiving a battery 70. The battery can be permanently integrated or designed as a replaceable battery 70. In the present exemplary embodiment, it is designed as a replaceable push battery 72. It is pushed into the free end 74 of the handle 24 and is detachably connected to the handle housing 68 by means of latching elements not shown here. Alternatively, the rotational speed of the motor 26 can be set by the setting wheel 76. In addition, the handle 24 and the main housing 64 are ergonomically shaped. A concave notch 78 in the transition of the handle 24 to the main housing 64 is used for intuitive grasping with the index finger. This area can also be covered with a flexible skin 80. Of course, other regions of the hand-held power tool can also be provided with skin-specific and/or tactile material. However, the upper side 82 of the main housing 64 is also provided for holding a hand, in particular the palm of the hand, so that the hand-held power tool can be guided by gripping the main housing 64, either with both hands or with one hand.

Figure 3 shows the grinder of figure 1 in a cross-sectional view B-B in plane (B). The drive shaft 28 drives a central wheel 34 via a drive gear 32. The motor shaft axis 30 and thus the motor 26 are arranged eccentrically with respect to the center wheel 34, i.e. displaced in the direction of the front side 90 of the grinder 10. The central wheel axis 22, the motor shaft axis 30 and the driven shaft axis 42 of the driven shaft on the front side lie in a plane a. Plane B extends orthogonally to plane a. The two driven shafts 40 arranged mirror-symmetrically with respect to the plane a lie in the plane B. The central wheel axis 22 is arranged in the center of a regular triangle 92, at the corners of which three drive shaft axes 42 are arranged. Three spur gears 44 are rotationally driven by the center wheel 34. The spur gear 44 in turn drives the output shaft 40, which drives the grinding disks 12, 14, 16 or the grinding disk receptacles 56 at least indirectly (see fig. 2). In addition, a portion of the main housing 64 or housing portion 60 and another housing portion 62 are shown, which hold the driving and driven elements of the sharpener 10 in place.

Fig. 4 shows the grinder 10 in a non-operating state on a receiving surface 94, for example a workpiece to be machined. The sander 10 is supported at three points, namely at the free end 96 of the insertable accumulator 70 (alternatively, it can also be supported at the free end 74 of the handle 24, in particular if the accumulator 70 is fixedly mounted in the handle 24), and at the rear edge 98 of the two sanding disks 14, 16, in particular of the two sanding disks 14, 16 facing the handle 24Or in other wordsThe free ends 74, 96 of the push-in accumulator 72 are at the edge 98 (where only the grinding disk 14 is visible, since it blocks the grinding disk 16). In principle, identical components from different figures are assigned the same reference numerals, but these reference numerals are not re-explained for each figure.

Fig. 5 shows the hand-held power tool or grinder 10 in a side view. The housing part 60 has three grinding disk receptacle regions 102, only two of which can be seen in fig. 5. The region of the housing part 60 supporting the grinding disk receiver 56 and its components, for example bearings, is defined as the grinding disk receiver region 102. By way of example, this is an area of the enveloping circle diameter 104 surrounding the grinding disk receptacle area 102. In the present exemplary embodiment, this region is stepped from the housing region 106 of the housing part 60, in particular in the direction of the peripheral abutment, in the direction of the grinding plane 112 (for accommodating bearings, better accessibility and/or for improving the freedom of movement of the grinding disks 12, 14, 16, for example with respect to tilting/pivoting). In other words, the peripheral housing region 106 is retracted from the grinding disk seat region 102 (zurtuckesetzt). However, such retraction is not to be understood as a recess 108 in the sense of the present invention. The grinding disk receptacle regions 102 each have an opening 100, via which a removable grinding disk 12, 14, 16 can be connected to the grinder 10. In this way, the coupling means 52 and/or the latching hooks 54 can be connected to the output shaft 40 and/or the grinding disk receptacle 56 (see the sectional view of fig. 2). Alternatively, however, it is also possible for the grinding disk holder 56 or the output shaft 40 to project through the grinding disk holder region 102. If only the output shaft 40 passes through the housing part, the grinding disk receptacle region 102 can also be understood as merely the region forming the opening 100 or the region supporting the output shaft 40 in the housing part 60 of the hand-held power tool, whether the receptacle of the grinding disks 12, 14, 16 takes place outside the housing part 60 of the hand-held power tool or because the grinding disks 12, 14, 16 are connected to the output shaft 40 in a non-detachable manner.

Between two adjacent grinding disk receptacle regions 102 or openings 100 (in the recess 122, as it were), the housing part 60 has an air guide channel 120. The air guide channel is formed by the recess 108. In the region of the air guide channel 120 or the recess 108, the distance 110 between the housing part 60 and the grinding surface 112 increases, in particular the distance 111 to the grinding surface 112 with respect to the housing region 106. Accordingly, the recess 108 is retracted relative to the housing region 106. The recess 108 has a concave shape 118. It tapers or narrows in the circumferential direction toward the center of the housing portion 60. Further, the size of the recessed portion becomes smaller toward this direction. The housing part 60 is thus recessed or grooved in a direction away from the grinding plane 112. Starting from a central region 114 of the housing part 60, in particular from the central region 114 in the region of the central wheel axis 22 between the grinding disks 12, 14, 16, which is central or intersects the housing part 60, the distance 110 between the housing part 60 and the grinding surface 112 increases in the radially outward direction along the air guide channel or along the recess 108, i.e. in the direction of an edge 116 of the housing part 60. Thus, the recess 108 is larger in the outer region of the housing portion 60 than in the central region. The recess 108 serves to better guide the air. The recess 108 forms at least a part of the air guiding channel 120, in particular to be used for dust removal.

Similarly to the recesses 108 between the grinding disks 12, 16 (front and rear grinding disks) or between the respective grinding disk receptacle regions 102, recesses 108 are also provided between the rear grinding disks 14, 16 or between the respective grinding disk receptacle regions 102 (see fig. 6). It can also be gathered from fig. 6, which shows the recess from a rear view: the recess or distance 110 increases from a central region 114 of the housing portion 60 to an edge 116 of the housing portion 60 or radially outward from the center. The recess 108 on the rear side is of mirror-symmetrical design with respect to the plane a (see also section a-a of fig. 2). The recess 108 also enables a contactless tipping 124 of the grinding discs 12, 14, 16 relative to the housing part 60. Thus, for example, during operation of the grinder 10, the edges of the grinding disks 12, 14, 16 do not rub against the housing portion 60. The three recesses 108 between the grinding disks 12, 14, 16 or the grinding disk receptacles 56 are each arranged offset by 120 ° from the center with respect to one another. They are each mirror-symmetrical about the bisector of the angle of the regular triangle.

Fig. 5 and 6 also show a housing separation rim 126. A housing separation rim 126 is disposed between the housing portion 60 and the other housing portion 62. The two housing parts 60, 62 are part of the driven shaft housing 202 or the main housing 64. The housing separation edge 126 forms, in particular, a housing separation slit 130. The housing separation edge 126 or the housing separation seam 130 is formed by the assembled housing shells of the hand-held power tool or grinder 10. It forms a setback in the housing surface. It surrounds the driven shaft housing 202. It forms a form-locking element 132, in particular a latching recess 134, for receiving a corresponding form-locking element 136 (see fig. 7) of a dust hood 138, preferably a latching projection 140 of the dust hood 138. Instead of grooves or recesses, the form-locking elements 132 can in principle also form projecting or male form-locking elements. Likewise, a female form-locking element can be provided on the suction hood 138 instead of a male form-locking element. Furthermore, the recess 108 in the housing part 60 serves as a further form-locking element 142, in particular as a stop element 144 for a corresponding further form-locking element 146 on the dust hood 138. In the case of a predetermined application of the dust hood 138 from the grinding disk plane 112 onto the driven shaft housing 202 or onto the housing part 60, the form-locking element or elements 146 act as a stop or stop. Thus, the dust hood 138 is not pushed too far onto the driven shaft housing 202. As soon as the form-locking element 146 comes to a stop, the form-locking element 136 also snaps into the position in which it is arranged or into the corresponding form-locking element 132.

Fig. 7 shows the suction hood 138 in a perspective view. It is a removable dust hood 138 for a hand-held power tool, in particular for a grinder 10, in particular, wherein the hand-held power tool is designed for driving a plurality of, in particular, tilt-supported, rotatable and/or oscillating and/or randomly circularly driven grinding disks 12, 14, 16. The suction hood 138 has a connection piece 148 for connection to a suction device (not shown here), which is typically a mobile or stationary vacuum cleaner or suction device. The nipple 148 projects toward an exterior 149 of the suction hood 138. The suction hood 138 has a suction opening 150, which opens out into an interior 152 of the suction hood 138, starting from the connecting piece 148. The dust hood 138 has a substantially triangular geometry, in particular a substantially regular triangular geometry. "substantially" is understood herein that the corners 154 of the "triangle" can be rounded as shown in fig. 7. Further, the waist 156 can also be other than a straight shape as appropriate, such as slightly arcuate, or the like.

In the region of the suction opening 150, the suction hood 138 has a projection 158. The protrusion serves to avoid lateral air flows, in particular from below 184 (see fig. 8) of the protrusion 158, i.e. from below the side of the protrusion 158 facing away from the suction opening 150. The protrusion 158 extends into the interior 152 of the dust hood 138. The projection 158 has a main extension direction 160, starting from the suction opening 150, which extends into the interior 152 of the dust hood 138. Furthermore, the projection 158 has at least one, in particular two, wall portions 162. The wall portions serve to reduce transverse air flow, particularly from below 184 of the dust hood 138 and/or from within the dust hood 138 along the lateral direction 164. However, the projection 158 and/or the wall 162 can also be at least partially open in the lateral direction 166, 168, in particular for achieving a transverse air flow in at least this region 170, 172. The protrusion 158 forms a part of the air guide passage 159. In particular, portions of the air guide passage 120 and portions of the air guide passage 159 together constitute the air guide passages 120, 159.

The dust hood 138 or the frame 174 of the dust hood 138 is flexible, in particular transversely to the lower or upper side of the dust hood 138 or in the direction of the interior 152 or exterior 149 of the dust hood 138. This makes it possible to spring-elastically pretension and/or press the dust hood 138 onto the hand-held power tool, in particular the sander 10 or its housing. This enables a tool-free and/or reliable and/or play-free connection to the grinder 10 to be established.

The frame 174 or the suction hood 138 tapers from bottom to top. In the region of the form-locking element 136, the frame 174 or the dust hood 138 is tapered in order to be connected to the form-locking element 142 of the hand-held power tool. This ensures that the upper edge 186 of the frame 174 or of the dust hood 138 can rest as closely as possible against the housing of the hand-held power tool without play. In this way, the pretensioning of the suction hood 138 in this region can be acted upon particularly efficiently.

Furthermore, the dust hood 138 can also be designed as a spacer and/or as a crash protection for the hand-held power tool or grinder (see also fig. 8). Instead of the housing of the grinder 10, the frame 174 or the rounded corners 154 and/or waists 156 serve as impact protection. The dust hood 138 also has a gripping contour 176. The grip contour 176 forms a slight curvature in the waist 156 or the frame 174. Thus, friction between the fingers and the dust hood 138 is improved when the dust hood 138 is pressed onto or pulled off the grinder 10. Furthermore, the gripping contour 176 is similar to a silhouette contour 178 of at least one region of the hand-held power tool or grinder (see fig. 5 and 6). The silhouette contour is formed here by a contour of the edge 116 of the housing part 60, in particular in the region of the recess 108, in particular when viewing the edge 116 or the grinder 10 laterally.

Fig. 8 shows a system comprising a hand-held power tool or grinder 10 and a suction hood 138 connected or attached thereto. In addition to the components already described, the dust hood 138 or the hand-held power tool or the sander 10 has an especially elastic connecting element 179, especially an elastic band 180, preferably a rubber elastic band 180, for connecting the nipple 148 or a nipple adapter 182 to the sander 10. The elastic band 180 is tensioned in particular between the free ends 74, 96 of the handle 24 or the accumulators 70, 72 of the sander 10 and the nipple 148 or the nipple adapter 182. Preferably, the elastic band is secured in a loss-proof manner to the nipple 148, nipple adapter 182, or handle 24. Here, it is fixed on the nipple adapter, for example by adhesive bonding or injection-molding attachment. Alternatively, the strap can also be detachable on one side, so that in the open state it can be stopped on or passed around the respective other component and can be fastened again, for example by means of a button, a locking mechanism or the like.

Fig. a to d in fig. 9 show the hand-held power tool or grinder 10 of the preceding figures in hatched representation, in order to also make the arching structure visible. Fig. 9a shows the grinder 10 in a side view, fig. 9b in a rear view, fig. 9c in a perspective view and fig. 9d in a plan view. The sander 10 is used for simultaneously driving three, in particular tiltable, rotating and/or oscillating and/or randomly circular driven grinding disks 12, 14, 16, the sander 10 having at least one driven shaft housing 202 which substantially surrounds the three driven shafts 40 (not represented here, see in particular fig. 2) orthogonally to the driven shaft axes 42, 202, 204, 206 and a motor housing 200 which substantially surrounds the motor 26 orthogonally to the motor shaft axis 30. The sharpener 10 has a handle 24. The driven shaft axis 42, 204 on the front side is better distinguished from the driven shaft axis 42, 206, 208 on the rear side by additional reference numerals. The driven shaft housing 202 encloses at least substantially three driven shafts 40 orthogonally to the driven shaft axis 42. The motor housing 200 surrounds the motor 26 at least substantially orthogonally to the motor shaft axis 30.

The cross-sectional area 210 of the motor housing 200, which is orthogonal to the motor shaft axis 30 in the constricted region 212 of the motor housing 200, is less than 70%, in particular less than 65%, preferably less than 55%, relative to the cross-sectional area 214 of the output shaft housing 202, which is orthogonal to the output shaft axis 42 in the expanded region of the output shaft housing 202, in particular in the region 216 of the output shaft housing 202 which is expanded most. In the presented fig. 10, it is about 52%. The term "expansion region 216" is to be understood in particular to mean the region having the largest cross-sectional area 214 of the driven shaft housing 202. Thus, in this region 216, the extent, for example the length 218 or the circumferential section or circumference 215 around the driven shaft housing 202 is greatest. Furthermore, in the side, rear and top views of fig. 9a to 9c, the length and width of the motor housing 200 in the constriction region 212 and the length and width of the driven shaft housing 202 in the expansion region 216 are provided with the following reference numerals: driven shaft housing 202: length 218, width 220; a motor housing: length 222, width 224. Proportionally, the expanded region 216 of the driven shaft housing 202 is about 30% longer and about 65% wider than the contracted region 212 of the motor housing 200. The ratio of the cross-sectional area of the expanded region 216 of the driven shaft housing 202 relative to the constricted region 212 of the motor housing 200 is about 190% (see fig. 10).

Fig. 10 also shows the cross-sectional area ratio of a certain region. Less than 75%, in particular less than 50%, preferably less than 25% of the cross-sectional area 214 of the output shaft housing 202 in the rear region 226 of the hand-held power tool or grinder 10 is covered by the cross-sectional area 210 of the motor housing 200, in particular in the constriction region 212, projected along the motor shaft axis 30. Similarly, less than 75%, in particular less than 50%, preferably less than 25%, of the grinding surfaces 232 of the grinding disks 14, 16 applied on the rear side on the grinder 10 are covered by the cross-sectional area 210 of the motor housing 200 projected along the motor shaft axis 30, in particular in the constriction region 212. In a front region 228 of the hand-held power tool, a cross-sectional area 210 of the motor housing 200, which is projected along the motor shaft axis 30, in particular also in the constriction region 212, covers more than 70%, in particular more than 90%, preferably completely, of a cross-sectional area 214 of the driven shaft housing 202. Similarly, the grinding surface 234 of the grinding disk 12 applied on the front side on the grinder 10 is covered by more than 70%, in particular more than 90%, preferably completely, by the cross-sectional area 210 of the motor housing 200, in particular also in the constriction region 212, projected along the motor shaft axis 30.

Furthermore, fig. 10 also shows the circumference 211 of the motor housing 200, which is orthogonal to the motor shaft axis 30 or the driven shaft axis 42, in particular in the constricted region 212 of the motor housing 200, in relation to the circumference 215 of the driven shaft housing 202, which is orthogonal to the driven shaft axes 42, 204, 206, 208, in particular in the expanded region 216 of the driven shaft housing 202. It is less than 80%, here about 70%. In other words, the circumference 215 of the driven shaft housing 202 is approximately 145% relative to the circumference 211 of the motor housing 200 in the constricted region 212.

Furthermore, one, in particular two, of the three output shaft axes 42, in particular the two output shaft axes 206, 208 of the hand-held power tool on the rear side, are outside the motor housing 200, in particular outside the constriction region 212 of the motor housing 200. The driven shaft axes 206, 208 thus do not intersect the motor housing 200, at least in the constriction region 212, in particular everywhere. In addition, in particular one, preferably two, of the three driven shaft axes 204, 206, 208, in particular the two driven shaft axes 206, 208 on the rear side of the hand-held power tool or grinder 10 are located outside the handle 24, in particular the bar-shaped handle 24. The driven shaft axis is also outside of the recessed region 230 or recessed depression of the handle 24 and/or motor housing 200 or outside of the recessed transition region 276 of the handle 24 and motor housing 200. The driven shaft axis 204 of the hand-held power tool or grinder 10 on the front side is located within the motor housing 200 and/or within the motor housing handle 236 and thus also intersects the latter.

The side view of fig. 9a also shows that the ratio of the height 238, 240 of the hand-held power tool in the direction along the driven shaft axis 42, 204, 206, 208, in particular the height 238 of the motor and driven shaft housings 200, 202, to the length 242 of the substantially rod-shaped handle 24, in particular the length 242 of the rod-shaped handle 24 protruding substantially perpendicularly to the motor housing 200 or substantially perpendicularly to the drive and driven shaft axes 30, 204, is less than 50%, in particular less than 75%, preferably less than 85%, in particular approximately the same. A "bar-shaped handle projecting substantially orthogonally to the drive and driven shaft axes 30, 204" is to be understood here as being in the angular region of 60 ° to 120 °, in particular 75 ° to 105 °, preferably 90 °, with respect to the drive and driven shaft axes 30, 204, 206, 208. Advantageously, a very compact hand-held power tool can thereby be provided. The center of gravity S is thus moved as tightly as possible to the grinding disks 12, 14, 16. Furthermore, a total length 244 of the hand-held power tool, which is orthogonal to the at least one drive or driven shaft axis 30, 42, 204, 206, 208, in particular a total length from the end of the motor housing 200 to the end of the bar-shaped projecting handle 24, is greater than a height 238, 240 of the hand-held power tool along at least one direction of the drive or driven shaft axis 30, 42, 204, 206, 208, in particular a length from the grinding plate plane 112 to the end of the handle 24 to the motor housing 200, by 10%, in particular by 25%, preferably by approximately 40%.

Furthermore, the weight of the battery 72 is approximately 10% to 50%, in particular 30% to 40%, more relative to the components of the drive train, in particular including the motor 26, the drive gear 32, the sun gear 34, the output shaft 40 and the spur gear 44. This can positively influence the orientation of the center of gravity S. The volume of the motor and driven shaft housings 200, 202 is about 20% to 70%, in particular about 50%, more than that of the rod-shaped handle housing 68.

Fig. 9a and 9d and the side and perspective views of fig. 11 also show a grinding machine housing 250, which has at least one housing shell element 252 and at least one further housing shell element 254 connected to the housing shell element 252, which form the handle 24, 258 at least in sections. The grinding machine housing 250 features at least one ventilation opening 262, in particular a ventilation slot, which is formed at least in sections in the region of the separating edge 260 of the housing shell element 252 and the further housing shell element 254. The ventilation opening 262 advantageously extends through two regions 264, 266 which are arranged at an angle 268, in particular at an angle 268 (see fig. 10, side view) of between 90 ° and 120 °, preferably between 100 ° and 105 °, relative to one another. Advantageously, the angle is based on the orientation of the rod-shaped handle relative to the motor housing. The vent region is advantageously oriented parallel to its main extension. Advantageously, the ventilation opening 262, in particular the ventilation opening of the section 266 in the region of the handle 258, is provided for circulating, in particular cooling, heating and/or drying, the user's hands.

The housing shell element 252 and the further housing shell element 254 are connected to one another, in particular fixed to one another, in particular without visible fastening elements at least substantially along at least substantially the entire contact line and/or contact surface of the housing shell element 252 and the further housing shell element 254. Furthermore, the handle 24, 258 is at least substantially free of separating edges, at least on the side of the handle 24, 258 facing and/or facing away from the grinding plate 12, 14, 16 or the tool side.

Furthermore, the grinder housing 250 has a motor housing section 270 and a rod-shaped handle housing section 272, wherein the grinder housing 250 has a concave depression 278 or recess in a transition region 276 between the rod-shaped handle housing section 272 and the motor housing section 270 (see fig. 10). The depression 278 serves as an ergonomic abutment for the fingers, particularly the user's thumb. The dimples are particularly well recognizable in the side view of fig. 9 a. The hatched lines indicate the area of arching. Preferably, the vent/vents 262 can be formed by an offset of the housing rims of the housing element 252 and the further housing element 254.