US20220118580A1

US20220118580A1 - Hand-Held Sanding Machine

Info

Publication number: US20220118580A1
Application number: US17/484,801
Authority: US
Inventors: Adamo Sadikovic; Florian Esenwein; Simon Riggenmann
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2020-10-20
Filing date: 2021-09-24
Publication date: 2022-04-21
Also published as: CN114378691A; DE102020213229A1

Abstract

A hand-held sanding machine includes at least one sanding device for receiving or configuring a sanding apparatus. The sanding device includes at least one fan for conveying away material subtracted in a sanding procedure, at least one drive device for driving the sanding device, and at least one connecting housing unit which at least partially receives the sanding device. An internal wall of the connecting housing unit that delimits a fan receptacle region is configured for guiding an air flow generated by the fan. The internal wall is funnel-shaped about a rotation axis of a driveshaft of the drive device.

Description

This application claims priority under 35 U.S.C. § 119 to application no. DE 10 2020 213 229.1, filed on Oct. 20, 2020 in Germany, the disclosure of which is incorporated herein by reference in its entirety.

BACKGROUND

A hand-held sanding machine having at least one sanding device for receiving or configuring a sanding means, wherein the sanding device comprises at least one fan for conveying away material subtracted in a sanding procedure, having at least one drive device for driving the sanding device and having at least one connecting housing unit which at least partially receives the sanding device, has already been proposed in US 2016/0184963 A1.

SUMMARY

The disclosure proceeds from a hand-held sanding machine having at least one sanding device for receiving or configuring a sanding means, wherein the sanding device comprises at least one fan for conveying away material subtracted in a sanding procedure, having at least one drive device for driving the sanding device and having at least one connecting housing unit that at least partially receives the sanding device.
It is proposed that an internal wall of the connecting housing unit that delimits a fan receptacle region is configured for guiding an air flow generated by the fan, said internal wall being funnel-shaped about a rotation axis of a driveshaft of the drive device. The hand-held sanding machine is preferably able to be held with one hand, in particular without a transporting and/or holding device, and is in particular able to be guided and operated by the same hand during a sanding procedure. The hand-held sanding machine can be configured as a random orbital sander, a positively-driven random orbital sander, as an orbital sander, as a triangular orbital sander, as a polisher, or the like. The sanding means can be configured, for example, as a sanding paper, as a sanding sponge block, as a non-open sanding fabric, as a woven sanding fabric, as a polishing sponge, as a scrubbing disk, as a polishing mop, or the like. The sanding device comprises in particular at least one sanding pad having a flat base area which is in particular at least substantially perpendicular to the rotation axis and which is provided for fastening the sanding means. “Provided” here is in particular to be understood as being specially specified, specially programmed, specially conceived and/or specially equipped. An object being provided for a specific function is in particular to be understood to mean that the object fulfils and/or carries out this specific function in at least one application state and/or operating state. The term “substantially perpendicular” here is intended to define in particular an alignment of a direction relative to a reference direction, wherein the direction and the reference direction, in particular when viewed in a projection plane, enclose an angle of 90°, and the angle has a maximum deviation of in particular less than 8°, advantageously less than 5°, and particularly advantageously less than 2°.
The drive device is preferably disposed in a drive housing of the hand-held sanding machine. The connecting housing unit is disposed on the drive housing in particular in the direction of the rotation axis. The connecting housing unit and the drive housing can be configured so as to be mutually separate or integral. The fan received by the connecting housing unit, in the direction of the rotation axis, is preferably disposed between the sanding pad and the drive device. The fan is preferably aligned so as to be coaxial with the driveshaft. Alternatively, the fan is aligned so as to be coaxial with an eccentric axis of the sanding device. The fan can be disposed directly on the driveshaft, or be connected to the driveshaft by means of a separately configured transmission element, so as to be driven by the driveshaft. A maximum extent of the connecting housing unit parallel to the rotation axis preferably extends completely across a maximum extent of the fan, said maximum extent being parallel to said rotation axis. The connecting housing unit in particular delimits the fan receptacle region at least in a plane that is perpendicular to the rotation axis. The fan receptacle region in the direction of the rotation axis is delimited at least by the drive housing, the sanding pad and/or the connecting housing unit. A maximum transverse extent of the fan receptacle region perpendicular to the rotation axis is preferably smaller than the maximum transverse extent of the sanding pad perpendicular to the rotation axis. A sanding ring which is fastened to the connecting housing unit, is in particular press-fitted in a groove, and bears on the sanding pad is preferably disposed between the connecting housing unit and the sanding pad. The connecting housing unit has in particular an air inlet which is disposed on a base portion of the connecting housing unit that faces the sanding pad. A transmission of the sanding device that connects the sanding pad to the driveshaft preferably protrudes through the air inlet. A geometric central axis of a wall of the connecting housing unit that delimits the air inlet is preferably disposed so as to be coaxial with the rotation axis. The connecting housing unit preferably has an ejection port, in particular for connecting to a material collection device and/or a suctioning device, said ejection port having an outlet opening by means of which the ejection port is fluidically connected to the fan receptacle region. The fan is in particular provided for generating an air flow from the air inlet through the connecting housing unit to the ejection port, said air flow entraining the subtracted material. The fan is preferably configured as a radial fan. The fan has in particular a blade assembly which faces the air inlet. The fan has in particular a base plate to which the blade assembly is fastened and which faces the drive device.
A receptacle radius of the fan receptacle region describes in particular a spacing of the internal wall of the connecting housing unit from the rotation axis, said spacing being in a direction perpendicular to the rotation axis. The receptacle radius of the funnel-shaped fan receptacle region on the base plate of the fan is preferably larger than at the air inlet. The receptacle radius of the funnel-shaped fan receptacle region, proceeding from the air inlet, preferably widens in the direction of the rotation axis, in particular up to the base plate of the fan. The receptacle radius of the funnel-shaped fan receptacle region at the base plate of the fan in particular has a maximum, in particular irrespective of the outlet opening. The maximum of the receptacle radius of the fan receptacle region, said maximum being spaced apart in particular from the outlet opening, is in particular at least 10%, preferably more than 15%, particularly preferably more than 20%, larger than a value of the receptacle radius at the air inlet. An opening width of the air inlet is preferably smaller than the receptacle radius of the fan receptacle region at the air inlet. The base portion has in particular a surface that faces the fan and runs so as to be at least substantially perpendicular to the rotation axis and in particular delimits the air inlet. Proceeding from the base portion, the receptacle radius preferably increases continuously along the rotation axis, in particular without jumps and/or in a monotonous manner, optionally in a strictly monotonous manner, in particular irrespective of the outlet opening. A derivative of the receptacle radius in terms of a position along the rotation axis may be consistent or have jumps. The fan receptacle region on the side of the maximum of the receptacle radius that faces away from the air inlet decreases, in particular so as to adapt to a cross section of the connecting housing unit perpendicular to the rotation axis to a cross section of a portion of the drive housing that faces the connecting housing unit.
As a result of the design embodiment according to the disclosure, the connecting housing unit can be advantageously adapted to an air flow generated by the fan, said air flow comprising a component parallel to the rotation axis and the component about the rotation axis. The air can in particular configure an advantageously stable turbulence about the rotation axis. A deflection of the air flow can in particular be kept advantageously low. The probability of local turbulences arising can in particular be kept advantageously low. The risk of material being deposited in portions of the fan receptacle region that are exposed to a minor flow can in particular be kept advantageously low. An advantageously effective separation of the subtracted material can in particular be achieved. A maintenance and cleaning interval of the hand-held sanding machine can in particular be kept advantageously large.
It is furthermore proposed that the connecting housing unit comprises a conical spiral path which is disposed on the internal wall, running in particular from an air inlet, in particular the already mentioned air inlet of the connecting housing unit in the direction of the rotation axis to an ejection port, in particular the already mentioned ejection port of the connecting housing unit. It is conceivable that the hand-held sanding machine in an alternative design embodiment is configured independently of the funnel-shaped design embodiment of the fan receptacle region. The hand-held sanding machine in the alternative design embodiment, in particular in the design embodiment configured independently of the funnel-shaped design embodiment of the fan receptacle region, preferably comprises at least the sanding device for receiving or configuring the sanding means, wherein the sanding device comprises at least the fan for conveying away material subtracted in a sanding procedure, the drive device for driving the sanding device, and the connecting housing unit which at least partially receives the sanding device. The receptacle radius, at least in the region of the spiral path, is in particular dependent on the angular position of said receptacle radius in terms of a rotation about the rotation axis. The conical spiral path is in particular a face which is delimited by at least one conical spiral, preferably by a conical spiral and an arc which is concentric with the conical spiral. The angular position relates in particular to an angle which lies in a plane perpendicular to the rotation axis. The receptacle radius is in particular a function of an angular difference between the angular position of the receptacle radius and an angular reference. The angular reference is in particular disposed at the outlet location, in particular on a separation edge which is formed by the ejection port and the internal wall of the connecting housing unit. The receptacle radius in the region of the spiral path preferably has the lowest value at the separation edge. The receptacle radius in the region of the spiral path, proceeding from the separation edge about the rotation axis, preferably increases in a monotonous, optionally strictly monotonous manner, in particular in a clockwise manner or a counter-clockwise manner when viewed in a direction onto the sanding pad. The spiral path in a projection along the rotation axis preferably has the shape of an arithmetic spiral, alternatively a logarithmic spiral, a hyperbolic spiral, or any other spiral shape. The spiral path preferably comprises less than one winding. The spiral path preferably comprises more than a quarter winding, in particular half a winding or more. The spiral path, in a direction pointing away from the outlet opening, particularly extends from the separation edge up to a beginning of the outlet opening that is opposite the separation edge. For example, in a semi-monocoque construction of the connecting housing unit, the spiral path can be configured in only one of the primary shells, or in both primary shells, of the connecting housing unit. A product calculated from a pitch of the spiral path and the number of windings of the spiral path corresponds at least substantially to in particular more than ⅓, preferably more than ⅔, of the maximum extent of the blade assembly of the fan parallel to the rotation axis. The spiral path, in a direction parallel to the rotation axis, at least proceeding from a terminal plane of the blade assembly that faces the sanding pad, extends in particular up to the outlet opening. As a result of the design embodiment according to the disclosure, a movement of the air flow from the sanding pad in the direction away from the rotation axis can be advantageously facilitated. The formation of a turbulence about the rotation axis toward the outlet opening can in particular be advantageously facilitated.
It is furthermore proposed that the internal wall is segmented in the direction of the rotation axis, wherein an outlet opening, in particular the already mentioned outlet opening, of an ejection port, in particular of the already mentioned ejection port of the connecting housing unit, and an air inlet, in particular the already mentioned air inlet of the connecting housing unit, are disposed in different segments of the internal wall. It is conceivable that the hand-held sanding machine in an alternative design embodiment is configured independently of the funnel-shaped design embodiment of the fan receptacle region and/or of the conical spiral path. The hand-held sanding machine in the alternative design embodiment, in particular in the design embodiment configured independently of the funnel-shaped design embodiment of the fan receptacle region and/or of the conical spiral path, preferably comprises at least the sanding device for receiving or configuring the sanding means, wherein the sanding device comprises at least the fan for conveying away material subtracted in a sanding procedure, the drive device for driving the sanding device, and the connecting housing unit which at least partially receives the sanding device. The outlet opening is in particular disposed in an ejection segment of the connecting housing unit. The internal wall in the ejection segment preferably run so as to be at least substantially perpendicular to the rotation axis. The connecting housing unit preferably comprises at least one guiding segment which in the direction of the rotation axis is disposed between the ejection segment and the base portion. The guiding segment configures in particular the conical spiral path. The internal wall in the guiding segment runs in particular at an acute angle in relation to the rotation axis. The connecting housing unit preferably comprises at least one further guiding segment which is disposed between the guiding segment and the base portion. The internal wall in a further guiding segment has in particular an angle in relation to the rotation axis that is larger than the angle of the guiding segment in relation to the rotation axis. As a result of the design embodiment according to the disclosure, the internal wall can be adapted in an advantageously accurate manner to a geometry of the fan. In particular, a spacing of the internal wall from the fan, and in particular a flow resistance through the connecting housing unit, can be established in an advantageously accurate manner. A primary flow direction through the connecting housing unit can in particular be defined as a result. A local formation of turbulence can in particular be kept advantageously low. The connecting housing unit can in particular be kept advantageously compact.
It is furthermore proposed that a separation edge formed by an outlet opening, in particular by the already mentioned outlet opening, of an ejection port, in particular of the already mentioned ejection port of the connecting housing unit, said separation edge hereunder being referred to as a further separation edge for reasons of differentiation, run so as to be at least substantially perpendicular to the rotation axis. The further separation edge separates in particular the guiding segment from the ejection segment. The further separation edge in a plane parallel to the rotation axis preferably has a material-proximal angle which is obtuse, being in particular more than 100°, preferably more than 110°, particularly preferably more than 115°. The further separation edge in a plane substantially perpendicular to the rotation axis preferably runs so as to be curved about the rotation axis, preferably in the shape of an arc. The further separation edge is preferably disposed in a plane which runs between the terminal plane of the blade assembly and the base plate of the fan. Alternatively, the further separation edge is disposed in the terminal plane of the blade assembly, or between the terminal plane and the sanding pad. As a result of the design embodiment according to the disclosure, a proportion of the subtracted material can advantageously be filtered, said proportion having a velocity component in a direction facing away from the sanding pad. The material dispatched through the ejection port has in particular an advantageously highly homogenous distribution of velocity. The risk of the material being deposited on an internal wall of the ejection port can in particular be kept advantageously low.
It is furthermore proposed that a separation edge, in particular the already mentioned separation edge, formed by an outlet opening, in particular by the already mentioned outlet opening of an ejection port, in particular of the already mentioned ejection port of the connecting housing unit, and running so as to be substantially parallel to the rotation axis is configured so as to be highly tapered and to have a curvature radius of less than 10 mm. The curvature radius is preferably smaller than 3 mm, particularly preferably smaller than 2 mm. The curvature radius is preferably larger than 1 mm. the curvature radius of the separation edge lies in particular in a plane that is at least substantially perpendicular to the rotation axis. The curvature radius of the separation edge, in particular independently of an exact shaping of the separation edge, describes a smallest imaginary circle which bears on the internal wall that faces the fan as well as on an internal wall of the ejection port. Tangents that bear on the internal wall and the internal wall of the ejection port, in a plane perpendicular to the rotation axis, preferably enclose an angle between 45° and 65°, preferably between 55° and 60°. As a result of the design embodiment according to the disclosure, the air flow can be advantageously directed in an effective manner into the ejection port. An average dwell time of the material in the fan receptacle region can in particular be kept advantageously short.
It is moreover proposed that at least one segment of the internal wall, in particular the segment of the internal wall that configures the already mentioned spiral path, in particular the guiding segment, has an angle between 15° and 60°, in particular between 20° and 40°, in relation to the rotation axis. The guiding segment preferably has an angle between 30° and 35° in relation to the rotation axis. The further guiding segment preferably has an angle between 50° and 75°, preferably between 55° and 65°, in relation to the rotation axis. The guiding segment has in particular a base edge that faces the sanding pad and is contiguous to the further guiding segment. The base edge preferably runs in a plane that is at least substantially parallel to the rotation axis. The base edge is preferably disposed so as to be circular about the rotation axis. The guiding segment preferably has a guiding edge that faces the drive device. A spacing of the guiding edge from the base edge, in particular parallel to the rotation axis and perpendicular to the rotation axis, depends on the angular position of a point on the guiding edge. The spacing between the guiding edge and the base edge increases in particular in the circumferential direction in terms of the rotation axis. A face which is disposed between the guiding edge and the base edge configures in particular the conical spiral path. As a result of the design embodiment according to the disclosure, a proportion of flow that is perpendicular to the rotation axis can be kept advantageously low. An advantageously stable formation of a turbulence about the rotation axis and parallel to the rotation axis can in particular be achieved.
It is furthermore proposed that a duct longitudinal axis of an ejection port, in particular of the already mentioned ejection port of the connecting housing unit, in a plane that is perpendicular to the rotation axis, is aligned so as to be at an acute angle in relation to a longitudinal axis of the drive device. The longitudinal axis runs in particular so as to be at least substantially perpendicular to the rotation axis. The drive device, and in particular the entire hand-held sanding machine, in the direction of the longitudinal axis, has in particular a maximum longitudinal extent which is larger than an overall height of the drive housing parallel to the rotation axis. The longitudinal axis and the rotation axis define in particular an assembly plane in which assembly clamshells of the drive housing and/or of the connecting housing unit are disposed on one another. The duct longitudinal axis in a plane perpendicular to the rotation axis has in particular an acute angle in relation to the longitudinal axis, in particular in relation to the assembly plane, said acute angle being in particular between 30° and 60°, preferably between 40° and 50°, particularly preferably between 44° and 46°. The duct longitudinal axis, in a plane perpendicular to the rotation axis, preferably bears tangentially on an external contour of the fan. The duct longitudinal axis, in a tangential plane of an external contour of the fan, runs in particular in a plane perpendicular to the rotation axis. An internal wall of the ejection port in the outlet region preferably continues the spiral path in a tangential manner and smoothly transitions to a profile parallel to the duct longitudinal axis. As a result of the design embodiment according to the disclosure, an inertia of the air flow rotating about the rotation axis and of the subtracted material can be advantageously utilized for ejecting said air flow and said material out of the ejection port. A flow resistance of the ejection port can in particular be kept advantageously small, and an advantageously high efficiency of the fan can be achieved. Moreover, a material collection container attached to the collection port can be disposed so as to be advantageously spaced apart from the drive housing.
It is furthermore proposed that a duct longitudinal axis, in particular the already mentioned duct longitudinal axis, of an ejection port, in particular of the already mentioned ejection port of the connecting housing unit, and the plane perpendicular to the rotation axis enclose an acute angle. The acute angle between the duct longitudinal axis and the plane perpendicular to the rotation axis is in particular more than 10°, preferably more than 15°, particularly preferably more than 20°. The acute angle between the duct longitudinal axis and the plane perpendicular to the rotation axis is preferably less than 50°, in particular less than 40°, preferably less than 35°. The ejection port has in particular an ejection opening for ejecting the subtracted material. The duct longitudinal axis preferably runs so as to be at least substantially perpendicular to the ejection opening. The ejection port optionally flattens in the region of the outlet opening such that a wall of the ejection duct that on the outlet opening faces the sanding pad in relation to the plane perpendicular to the rotation axis has a larger angle than the duct longitudinal axis. As a result of the design embodiment according to the disclosure, a movement of the air flow and of the subtracted material parallel to the rotation axis can advantageously be used for said air flow and said material to be ejected from the ejection port. A flow resistance of the ejection port can in particular be kept advantageously small, and an advantageously high efficiency of the fan can be achieved. Moreover, a material collection container that is attached to the collection port can be disposed so as to be advantageously spaced apart from the sanding pad and in particular from a workpiece treated with the hand-held sanding machine such that the hand-held sanding machine is able to be used in an advantageously flexible manner in particular also on uneven surfaces or surfaces that are difficult to access.
It is furthermore proposed that the connecting housing unit has at least two primary shells which in an assembly plane, in particular the already mentioned assembly plane parallel to the rotation axis, at least partially encompass the fan. The air inlet is in particular smaller than a maximum transverse extent of the blade assembly perpendicular to the rotation axis. The base portion is preferably disposed between the blade assembly and the sanding pad. The further guiding segment is preferably at least partially disposed between the fan and the sanding pad. The fan is preferably disposed between the base portion and an upper side of the connecting housing unit that faces the drive housing. The upper side and the base portion are in particular configured so as to be integral, encompassing the fan in a in particular U-shaped manner from a direction emanating so as to be perpendicular to the rotation axis. As a result of the design embodiment according to the disclosure, the fan receptacle region can be advantageously accurately defined, and a pressure loss by way of the fan can be advantageously accurately designed. The fan can in particular be advantageously operated in an efficient manner. An air flow with an advantageously high flow velocity can in particular be achieved. Assembling of the connecting housing unit can in particular take place in an advantageously rapid manner. In particular, a number of individual parts which can be potentially moved in relation to one another by the air flow or set in vibration by the latter can be kept advantageously low.
It is moreover proposed that the fan is asymmetrically configured for forming a transmission element of the sanding device. The fan configures in particular an eccentric of the sanding device for driving the sanding pad. The fan has in particular an in particular solid, disk-shaped base plate to which the blade assembly of the fan is fastened. The base plate preferably faces the drive device. The blade assembly of the fan preferably faces the sanding pad. The fan as an eccentric particularly has a central shank which in a plane perpendicular to the rotation axis is surrounded by the blade assembly. The central shank is in particular disposed on the base plate so as to be eccentric in relation to the base plate. The driveshaft is in particular connected in a rotationally fixed manner to the eccentric. The fan preferably has at least one fan counterbalance which is disposed within the blade assembly. The base plate of the fan preferably has a depression which is disposed so as to be offset in the direction of the rotation axis in relation to the remaining part of the base plate. The depression is in particular configured so as to be semi-annular. The depression and the fan counterbalance, in particular conjointly with part of the blade assembly, are preferably disposed in the depression. The maximum extent of the blade assembly on the depression, parallel to the rotation axis, is preferably smaller than the maximum extent of the remaining part of the blade assembly parallel to the rotation axis, in particular such that the entire blade assembly of the fan comprises the common terminal plane perpendicular to the rotation axis. As a result of the design embodiment of the disclosure, the sanding device can be configured so as to be advantageously compact and with few components. An advantageously small maximum extent of the sanding device and of the connecting housing unit parallel to the rotation axis can in particular be achieved.
It is furthermore provided that a blade assembly, in particular the already mentioned blade assembly of the fan, has a chamfer which is disposed so as to be transverse to the rotation axis and at least substantially parallel to a segment of the internal wall, in particular the further guiding segment. “Substantially parallel” here is in particular meant to be an alignment in a direction relative to a reference direction, in particular in a plane, wherein the direction in relation to the reference direction has a deviation which is in particular smaller than 8°, advantageously smaller than 5°, and particularly advantageously smaller than 2°. The blade assembly tapers in particular in a direction pointing away from the rotation axis. A maximum extent of a portion of the blade assembly that faces the internal wall, in a direction parallel to the rotation axis, is in particular smaller than the maximum extent of a portion of the blade assembly that faces the rotation axis. The base plate preferably has an in particular annular peripheral region which is inclined in the direction of the sanding pad, in particular in the direction opposite to that of the chamfer. The chamfer preferably has an angle between 50° and 75°, preferably between 55° and 65°, in relation to the rotation axis. As a result of the design embodiment according to the disclosure, an advantageously high flow velocity through the fan can be maintained. A static pressure between the fan and the internal wall can in particular be kept advantageously small.
The hand-held sanding machine according to the disclosure here is not intended to be limited to the application and embodiment described above. In particular, the hand-held sanding machine according to the disclosure for fulfilling a functional mode described herein may have a number of individual elements, components and units that deviate from the number of individual elements, components and units described herein. Moreover, the ranges of values specified in this disclosure and values lying within said limits should be considered to be disclosed and able to be used in any desired manner.

BRIEF DESCRIPTION OF THE DRAWINGS

Further advantages are derived from the description of the drawings hereunder. Four exemplary embodiments are illustrated in the drawings. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine said features so as to form expedient further combinations.

In the drawings:

FIG. 1 shows a schematic perspective illustration of a hand-held sanding machine according to the disclosure;

FIG. 2 shows a schematic plan view of the hand-held sanding machine according to the disclosure;

FIG. 3 shows a schematic longitudinal section of the hand-held sanding machine according to the disclosure;

FIG. 4 shows a schematic cross section of the hand-held sanding machine according to the disclosure;

FIG. 5 shows a schematic illustration of the fastening of a connecting housing unit of the hand-held sanding machine according to the disclosure;

FIG. 6 shows a schematic cross section of the connecting housing unit;

FIG. 7 shows a schematic longitudinal section of a material collection device of the hand-held sanding machine according to the disclosure;

FIG. 8 shows a schematic flow chart of a method according to the disclosure for assembling the hand-held sanding machine according to the disclosure;

FIG. 9 shows a schematic illustration of an alternative design embodiment of a hand-held sanding machine according to the disclosure having an alternative drive device;

FIG. 10 shows a schematic longitudinal section of the alternative design embodiment;

FIG. 11 shows a schematic illustration of a further alternative design embodiment of a hand-held sanding machine according to the disclosure having an alternative sanding device;

FIG. 12 shows a schematic longitudinal section of the further alternative design embodiment;

FIG. 13 shows a schematic illustration of an additional alternative design embodiment of a hand-held sanding machine according to the disclosure having a further alternative sanding device; and

FIG. 14 shows a schematic longitudinal section of the additional alternative design embodiment.

DETAILED DESCRIPTION

FIG. 1 shows a hand-held power tool 118 a configured as a hand-held sanding machine 10 a. The hand-held sanding machine 10 a is in particular configured as a random orbital sander. The hand-held sanding machine 10 a comprises a sanding device 12 a for receiving a sanding means 13 a. The sanding device 12 a comprises in particular a sanding pad 132 a which here, in an exemplary manner, is illustrated having a diameter of 125 mm. Alternatively, the sanding pad 132 a has a diameter of 150 mm, or any other diameter adapted to the size of the sanding means 13 a. The hand-held sanding machine 10 a comprises a drive device 14 a for driving the sanding device 12 a (see FIG. 4), said drive device 14 a defining in particular a rotation axis 24 a and about which the sanding pad 132 a is able to be driven, in particular an eccentric manner. The hand-held sanding machine 10 a comprises a drive housing 16 a which receives the drive device 14 a.
The drive housing 16 a has a longitudinal axis 92 a which runs so as to be at least substantially perpendicular to the rotation axis 24 a. The drive housing 16 a preferably has two drive housing clamshells which are disposed on one another in an assembly plane 50 a defined by the longitudinal axis 92 a and the rotation axis 24 a (cf. FIG. 2). The drive housing 16 a comprises a longitudinal axis portion 90 a which is disposed about the longitudinal axis 92 a. The longitudinal axis portion 90 a is provided in particular for receiving a rechargeable battery pack 138 a, in particular a 12V rechargeable battery pack. The drive housing 16 a has a front portion 94 a. The front portion 94 a surrounds an intersection region of the rotation axis 24 a and of the longitudinal axis 92 a. The front portion 94 a comprises a dome-shaped gripping area 96 a. The gripping area 96 a is optionally configured as a soft component which is disposed on, in particular embedded in, a housing main body of the drive housing 16 a. Alternatively, an external face of the housing main body of the drive housing 16 a configures the gripping area 96 a. The hand-held sanding machine 10 a comprises at least one activation element 88 a for controlling the drive device 14 a, in particular for switching on and switching off the drive device 14 a. The activation element 88 a is preferably configured so as to latch in the activated state of the drive device 14 a. The activation element 88 a is disposed in the gripping area 96 a. The activation element 88 a is disposed on a side of a plane which is perpendicular to the longitudinal axis 92 a and comprises the rotation axis 24 a, said side facing away from the longitudinal axis portion 90 a.
The hand-held sanding machine 10 a comprises an interface device 18 a for operatively connecting, in particular for coupling, the sanding device 12 a to the drive device 14 a. The interface device 18 a is disposed on the front portion 94 a so as to be in particular along the rotation axis 24 a. The interface device 18 a comprises at least one connecting housing unit 20 a for at least partially receiving the sanding device 12 a. The connecting housing unit 20 a is configured so as to be separate from the drive housing 16 a and the sanding device 12 a. The connecting housing unit 20 a has at least two primary shells 46 a, 48 a. The primary shells 46 a, 48 a are disposed on one another in particular in the assembly plane 50 a. The primary shells 46 a, 48 a are preferably made from plastics material. The primary shells 46 a, 48 a preferably have a wall thickness between 1 mm and 3.5 mm, preferably between 1.5 mm and 2.5 mm, particularly preferably between 1.9 mm and 2.3 mm. The connecting housing unit 20 a comprises an ejection port 76 a. The ejection port 76 a is in particular provided for ejecting material abraded in a sanding process from the connecting housing unit 20 a. The ejection port 76 a is preferably disposed on one of the primary shells 46 a. The hand-held sanding machine 10 a comprises a material collection device 116 a. The material collection device 116 a comprises a preferably air-permeable material collection container 112 a for collecting material subtracted in an operation of the hand-held sanding machine 10 a and in particular material ejected by way of the ejection port 76 a, such as in particular dust, chips and/or abraded material. In at least one configuration of the material collection container 112 a, a container longitudinal axis 114 a of the material collection container 112 a runs so as to be at least substantially parallel to the longitudinal axis 92 a of the drive housing 16 a. The container longitudinal axis 114 a is in particular configured as a container central axis which runs in particular through a geometric center of gravity of the material collection container 122 a.
FIG. 2 shows a view of the hand-held sanding machine 10 a along the rotation axis 24 a. The drive housing 16 a, in the plane which is perpendicular to the rotation axis 24 a and comprises the longitudinal axis 92 a, on both sides has a convexity 102 a, 104 a. A ratio of a maximum convexity transverse extent 107 a from the convexity 102 a to the convexity 104 a of the drive housing 16 a relative to a largest gripping area transverse extent 106 a of the front portion 94 a is between 0.75 and 0.9, in particular between 0.80 and 0.85. The largest gripping area transverse extent 106 a is preferably at the same time the largest transverse extent of the drive housing 16 perpendicular to the rotation axis 24 a and perpendicular to the longitudinal axis 92 a. The largest gripping area transverse extent 106 a in comparison to an overall height 54 a (cf. FIGS. 3 and 4) of the drive housing 16 a is preferably between 0.8 and 0.95, in particular between 0.85 and 0.9. The largest gripping area transverse extent 106 a is preferably between 65 mm and 85 mm, in particular between 70 mm and 80 mm. The overall height 54 a of the drive housing 16 a parallel to the rotation axis 24 a is in particular smaller than 95 mm, preferably smaller than 90 mm, in particular smaller than 85 mm. A maximum machine height parallel to the rotation axis 24 a of the hand-held sanding machine 10 a is particularly preferably smaller than 115 mm, in particular smaller than 110 mm.
The gripping area 96 a of the drive housing 16 a, proceeding from the front portion 94 a in the direction of the longitudinal axis 92 a, smoothly transitions to a constricted region 108 a of the longitudinal axis portion 90 a, said constricted region 108 a being delimited by the convexities 102 a, 104 a. A ratio of the maximum tapered transverse extent 110 a of the constricted region 108 a to the largest gripping area transverse extent 106 a of the front portion 94 a is between 0.7 and 0.85, in particular between 0.75 and 0.8. The gripping area 96 a of the drive housing 16 a extends from the front portion 94 a up to a plane which is perpendicular to the longitudinal axis 92 a and which intersects the convexities 102 a, 104 a. Optionally, the gripping area 96 a along the longitudinal axis 92 a extends beyond the convexities 102 a, 104 a. A plane which is perpendicular to the longitudinal axis 92 a and intersects the convexities 102 a, 104 a, subdivides a maximum longitudinal extent 111 a, 113 a of the drive housing 16 a at a ratio between 0.45 and 0.65. In particular, a ratio of a convexity position 139 a of the plane intersecting the convexities 102 a, 104 a along the longitudinal axis 92 a, proceeding from a most distal point of the front portion 94 a, to the maximum longitudinal extent 111 a without the rechargeable battery pack 138 a, is between 0.55 and 0.60. In particular, a ratio of a convexity position 139 a of the plane intersecting the convexities 102 a, 104 a along the longitudinal axis 92 a, proceeding from a most distal point of the front portion 94 a, to the maximum longitudinal extent 113 a including the rechargeable battery pack 138 a, is between 0.5 and 0.55. In particular, the maximum longitudinal extent 111 a, 113 a in the direction of the longitudinal axis 92 a is larger than the overall height 54 a of the drive housing 16 a.
The material collection container 112 a, in a plane perpendicular to the rotation axis 24 a, is disposed so as to be spaced apart from the gripping area 96 a of the drive housing 16 a. In particular, the material collection container 112 a by means of a mounting unit 124 a of the material collection device 116 a is in particular disposed so as to be freely suspended on the ejection port 76 a, in particular without any further supporting elements. A transition between the mounting unit 124 a and the material collection container 112 a is disposed in a plane which is perpendicular to the longitudinal axis 92 a and comprises the constricted region 108 a. A duct longitudinal axis 84 a of the ejection port 76 a of the connecting housing unit 20 a, in a plane perpendicular to the rotation axis 24 a, is aligned at an acute angle, preferably between 44° and 46°, in relation to the longitudinal axis 92 a. The duct longitudinal axis 84 a is preferably configured as a duct central axis which runs in particular through a geometric center of gravity of the ejection port 76 a. The hand-held sanding machine 10 a has an operating element 117 a, the latter being in particular different from the activation element 88 a, for controlling the sanding device 12 a (cf. FIG. 1), for example for adapting a rotating speed of the sanding pad 132 a. For example, the operating element 117 a is configured as a control dial. The operating element 117 a and the material collection container 112 a are disposed on different sides of the assembly plane 50 a defined by the rotation axis 24 a and the longitudinal axis 92 a. The drive housing 16 a has a spacing from the material collection container 112 a, said spacing being between 10 mm and 40 mm, preferably between 15 mm and 35 mm, particularly preferably between 20 mm and 30 mm. The operating element 117 a is preferably disposed in the constricted region 108 a. The operating element 117 a and the activation element 88 a are preferably disposed on different sides of a transverse plane 98 a which is perpendicular to the rotation axis 24 a and in which the front portion 94 a has the largest gripping area transverse extent 106 a.
FIG. 3 shows a longitudinal section of the hand-held sanding machine 10 a in the assembly plane 50 a, and FIG. 4 shows a cross section of the hand-held sanding machine 10 a. The sanding device 12 a preferably comprises an eccentric which is driven by a driveshaft 26 a. The sanding device 12 a preferably comprises an eccentric bearing 158 a which is in particular configured as a ball bearing. Optionally, the eccentric bearing 158 a comprises a plurality of ball bearings which are in particular stacked on one another along the rotation axis 24 a, or a ball bearing having multiple rows, in particular two rows. The eccentric bearing 158 a is in particular disposed on the eccentric and encompasses the eccentric preferably in a plane perpendicular to the rotation axis 24 a. The eccentric bearing 158 a is clamped to a shoulder of the eccentric in particular by means of mounting plate and a screw. A geometric center of the eccentric bearing 158 a is in particular disposed so as to be spaced apart from the rotation axis 24 a. The sanding device 12 a comprises in particular an annular sanding pad holder 156 a. The sanding pad holder 156 a is disposed on the eccentric bearing 158 a and preferably encompasses the latter in a plane perpendicular to the rotation axis 24 a. The sanding pad holder 156 a preferably has a groove in which the eccentric bearing 158 a is disposed. The eccentric bearing is particularly preferably configured so as to be overmolded by the sanding pad holder 156 a. The sanding pad holder 156 a is in particular rotatable relative to the eccentric. The sanding pad 132 a is preferably fastened to the sanding pad holder 156 a, in particular screw-fitted in a direction parallel to the rotation axis 24 a. The sanding device 12 a particularly optionally comprises a fan 66 a. The fan 66 a is in particular operated by the driveshaft 26 a. A blade assembly of the fan 66 a preferably surrounds the sanding pad holder 156 a in a plane perpendicular to the rotation axis 24 a, wherein the sanding pad holder 156 a protrudes beyond the fan 66 a in a direction of the rotation axis 24 a. The sanding device 12 a preferably comprises a sanding ring 154 a which is made of an elastic material and in a groove on the connecting housing unit 20 a is fastened in the rotationally fixed manner to the connecting housing unit 20 a so as to bear in particular on the sanding pad 132 a, particularly in order to stabilize a rotating movement of the sanding pad 132 a.
The drive device 14 a preferably comprises an electric motor 134 a. The electric motor 134 a comprises in particular a nominal voltage of 12 Volt. The drive device 14 a comprises the driveshaft 26 a which is in particular driven about the rotation axis 24 a by the electric motor 134 a. The drive device 14 a comprises in particular an electrical supply interface 136 a, in particular for connecting the rechargeable battery pack 138 a. The drive device 14 a preferably comprises at least one electronic control unit 140 a, in particular for controlling the electric motor 134 a. The electric motor 134 a, the electronic control unit 140 a and the electrical supply interface 136 a are in particular disposed in this sequence along the longitudinal axis 92 a. The electric motor 134 a is in particular disposed in the front portion 94 a. The electronic control unit 140 a is in particular disposed in the constricted region 108 a. The electrical supply interface 136 a is in particular disposed in the longitudinal axis portion 90 a. The driveshaft 26 a, preferably proceeding from the front portion 94 a, protrudes into the interface device 18 a.
The activation element 88 a is disposed on, in particular embedded in, a partial area of the gripping area 96 a, said partial area being disposed so as to be oblique in relation to the longitudinal axis 92 a and in relation to the rotation axis 24 a. The partial area receiving the activation element 88 a preferably has an angle between 40° and 50° in relation to the longitudinal axis 92 a. A projection of the activation element 88 a along the rotation axis 24 a has in particular no overlap with the electric motor 134 a. The activation element 88 a and the sanding device 12 a are disposed on different sides of the transverse plane 98 a which is at least substantially perpendicular to the rotation axis 24 a and in which the front portion 94 a has the largest gripping area transverse extent 106 a. A volume of the electric motor 134 a to the extent of in particular more than half, preferably more than 66%, particularly preferably more than 75%, is disposed on that side of the transverse plane 98 a that is opposite the activation element 88 a. A volume of a receptacle region of the electrical supply interface 136 a for receiving the rechargeable battery pack 138 a to the extent of between preferably 40% and 60% is disposed on that side of the transverse plane 98 a that is opposite the activation element 88 a. The partial area of the gripping area 96 a that surrounds the activation element 88 a is in particular configured so as to be flattened in the assembly plane 50 a, in particular so as to be flat in sections. The front portion 94 a in the transverse plane 98 a preferably has a continuously curved profile. Partial areas of the gripping area 96 a are mutually disposed at a front angle 142 a between 95° and 110°, one of said partial areas surrounding the activation element 88 a and both said partial areas terminating the front portion 94 a along the longitudinal axis 92 a. The front angle 142 a lies in particular in the assembly plane 50 a. The partial areas that terminate the front portion 94 a are in particular disposed on different sides of the transverse plane 98 a which has the largest gripping area transverse extends 106 a and runs perpendicularly to the rotation axis 24 a.
A ratio of the maximum gripping area height 100 a of the gripping area 96 a that is parallel to the rotation axis 24 a to the overall height 54 a of the drive housing 16 a, said overall height 54 a being parallel to said gripping area height 100 a, is preferably between and 0.65 and 0.8, preferably between 0.7 and 0.75. The gripping area 96 a in the direction of the rotation axis 24 a extends in particular up to an end of the electric motor 134 a that faces the sanding device 12 a. The drive device 14 a preferably comprises a drive fan 64 a, in particular a motor fan, in particular for cooling the electric motor 134 a. The drive fan 64 a is disposed on the rotation axis 24 a m between the electric motor 134 a and the interface device 18 a. The gripping area 96 a in the direction of the rotation axis 24 a preferably extends up to a fan portion 144 a of the drive housing 16 a, ventilation openings for suctioning and/or exhausting air through by way of the drive fans 64 a being disposed in said fan portion 144 a. The gripping area height 100 a preferably, in particular continuously, decreases in the direction of the longitudinal axis 92 a (cf. also FIG. 5). The drive fan 64 a and the longitudinal axis portion 90 a, are preferably, in particular completely, disposed on different sides of a plane that is perpendicular to the rotation axis 24 a. The front portion 94 a in the direction of the rotation axis 24 a preferably tapers toward the fan portion 144 a. In particular, the activation element 88 a along the longitudinal axis 92 a protrudes at least partially beyond the fan portion 144 a. A unit formed from the drive housing 16 a and the connecting housing unit 20 a on the fan portion 144 a, between the activation element 88 a and the sanding device 12 a preferably has a cross section which is perpendicular to the rotation axis 24 a and has the smallest surface area. In particular, the fan portion 144 a has a maximum transverse extent perpendicular to the rotation axis 24 a which is less than 65 mm, preferably less than 60 mm, particularly preferably less than 55 mm.
The interface device 18 a has a docking interface 22 a which is disposed on the drive housing 16 a. The connecting housing unit 20 a encompasses the docking interface 22 a in a fixing plane 27 a which is perpendicular to the rotation axis 24 a of the driveshaft 26 a of the drive device 14 a. The docking interface 22 a in the fixing plane 27 a has at least one axial form-fitting element 28 a, 29 a, 30 a, 32 a for forming a form-fit with the connecting housing unit 20 a, said form-fit being parallel to the rotation axis 24 a. A projection of the axial form- fit element 28 a, 29 a, 30 a, 32 a along the rotation axis 24 a lies at least substantially completely in the interior of the drive housing 16 a. The docking interface 22 a comprises in particular a plurality of axial form- fitting elements 28 a, 29 a, 30 a, 32 a, the projections of the latter along the rotation axis 24 a lying at least substantially completely in the interior of the drive housing 16 a. In particular, a projection of the entire docking interface 22 a lies at least substantially completely in the interior of the drive housing 16 a. The docking interface 22 a is preferably disposed along the rotation axis 24 a on the front portion 94 a. The fan portion 144 a is in particular disposed between the front portion 94 a and the docking interface 22 a. The docking interface 22 a is preferably configured so as to be materially integral to the drive housing 16 a. The entire height 54 a of the drive housing 16 a relates in particular to an extent parallel to the rotation axis 24 a, said extent including the docking interface 22 a.
The docking interface 22 a as an axial form-fitting element 30 a, 32 a comprises a fixing recess 34 a, 36 a. The fixing recess 34 a, 36 a preferably extends so as to be at least substantially parallel to the fixing plane 27 a. The fixing recess 34 a, 36 a is in particular provided for receiving a fixing element 38 a, 40 a of the connecting housing unit 20 a and a separately configured fixing element 42 a, 44 a. The fixing element 38 a, 40 a of the connecting housing unit 20 a is configured as a socket, particularly preferably as a screw dome. The socket is configured for receiving the separately configured fixing element 42 a, 44 a. The separately configured fixing element 42 a, 44 a is preferably configured as a screw. The overall receiving length of the socket corresponds in particular substantially, but in particular not completely, to a length of the separately configured fixing element 42 a, 44 a. The socket comprises in particular two socket portions, one of the latter being in each case disposed on the two primary shells 46 a, 48 a such that there is an air gap between the two socket portions. In particular, the primary shells 46 a, 48 a are fastened to the docking interface 22 a by tightening the separately configured fixing element 42 a, 44 a so as to be tensioned in the socket. The separately configured fixing element 42 a, 44 a engages in particular in the docking interface 22 a, in particular through the latter. The docking interface 22 a in the fixing plane 27 a preferably comprises at least two, in particular exactly two, exemplars of the fixing element 38 a, 40 a for each primary shell 46 a, 48 a, and in particular at least two, in particular exactly two, exemplars of the separately configured fixing element 42 a, 44 a which are in particular disposed on different sides of a plane which is perpendicular to the longitudinal axis 92 a and comprises the rotation axis 24 a. The connecting housing unit 20 a optionally comprises at least one additional fixing element 150 a, 152 a, which is provided for fastening the primary shells 46 a, 48 a to one another in a position spaced apart from the fixing plane 27 a. The connecting housing unit 20 a preferably comprises at least two additional fixing elements 150 a, 152 a which are in particular disposed between the fixing plane 27 a, in particular between an end of the docking interface 22 a that faces the sanding pad 132 a and the sanding pad 132 a. The additional fixing elements 150 a, 152 a are in particular configured as screws. Additional fixing recesses of the primary shells 46 a, 48 a for receiving the additional fixing elements 150 a, 152 a are preferably disposed in a plane parallel to the fixing plane 27 a, said plane having the largest transverse extent of the connecting housing unit 20 a in the assembly plane 50 a.
The docking interface 22 a as an axial form-fitting element 28 a perpendicular to the rotation axis 24 a comprises a docking cross section which along the rotation axis 24 a tapers in a direction which points away from the sanding device 12 a and in particular leads to the fan portion 144 a. The fixing recess 34 a, 36 a is in particular disposed between a maximum cross section of the docking interface 22 a perpendicular to the rotation axis 24 a and a minimum cross section of the docking interface 22 a perpendicular to the rotation axis 24 a. The docking interface 22 a preferably comprises a contact face 52 a which is formed by a surface of the docking interface 22 a that configures the taper. The contact face 52 a particularly faces away from the sanding device 12 a and particularly faces the drive device 14 a. The primary shells 46 a, 48 a on one of the respective internal wall thereof have in particular a mating face which is complementary to the contact face 52 a. The mating faces of the primary shells 46 a, 48 a are in particular disposed on the contact face 52 a and are particularly preferably pressed onto the contact face 52 a in a planar manner by means of the fixing elements 42 a. The docking interface 22 a as an axial axial form-fitting element 29 a on a boundary face toward the drive housing 16 a, in particular toward the fan portion 144 a, has a smaller cross section than the drive housing 16 a, said boundary face being at least substantially perpendicular to the rotation axis 24 a. A difference in terms of the cross sections of the docking interface 22 a and of the drive housing 16 a on the boundary face corresponds in particular to a wall thickness of the connecting housing unit 20 a, said wall thickness being in particular double said difference. A portion of the primary shells 46 a, 48 a that configures the mating faces preferably extends along the contact face toward the boundary face. The connecting housing unit 20 a is disposed on the docking interface 22 a so as to be at least substantially flush with the drive housing 16 a. The docking interface 22 a, in particular the contact face 52 a, comprises at least 10% to 20% of the overall height 54 a of the drive housing 16 a including the docking interface 22 a parallel to the rotation axis 24 a. A ratio of a docking height of the docking interface 22 a parallel to the rotation axis 24 a to a maximum transverse extent, in particular a maximum diameter, of the docking interface 22 a perpendicular to the rotation axis is preferably between 0.1 and 0.3, preferably between 0.15 and 0.2. A ratio of the docking height of the docking interface 22 a parallel to the rotation axis to a minimum transverse extent, in particular a minimum diameter, of the docking interface 22 a perpendicular to the rotation axis 24 a is preferably between 0.15 and 0.35, preferably between 0.2 and 0.25. A spacing parallel to the rotation axis 24 a between the maximum transverse extent and the minimum transverse extent of the docking interface 22 a perpendicular to the rotation axis 24 a, preferably corresponds to at least 60%, preferably more than 75%, of the docking height.
The contact face 52 a runs transversely to the fixing plane 27 a and is configured so as to be curved. The mating face has a curvature which is complimentary to that of the contact face 52 a. The curvature of the contact face 52 a and in particular of the mating face are preferably configured so as to be concave in terms of the rotation axis 24 a. A curvature radius that describes the contact face 52 a, and in particular the mating face, runs outside the docking interface 22 a and in particular through the connecting housing unit 20 a. The curvature radius is between 5 mm and 15 mm, preferably between 9 mm and 10 mm. A curvature center associated with the curvature radius preferably lies outside the connecting housing unit 20 a. The wall thickness of the connecting housing unit 20 a along the curvature optionally decreases in the direction of the drive housing 16 a. Alternatively, the wall thickness of the connecting housing unit 20 a is constant along the curvature. The contact face 52 a preferably comprises a flat contact portion which continues the curvature of the docking interface 22 a in a tangential manner in the direction of the sanding pad 132 a. The flat contact portion of the contact face 52 a in relation to the fixing plane 27 a in particular is inclined by an angle between 10° and 20° in the direction of the sanding pad 132 a. A portion of the primary shells 46 a, 48 a that configures the mating faces preferably extends beyond the flat contact portion, in particular at the same angle in relation to the fixing plane 27 a as the flat contact portion of the contact face 52 a. This extent of the primary shells 46 a, 48 a in this direction continues in particular up to an end of the connecting housing unit 20 a, or up to the additional fixing recesses or up to the ejection port 76 a. An upper side of the primary shells 46 a, 48 a that faces the drive device 14 a forms in particular a hand placing face which is inclined relative to the sanding pad 132 a and in particular slopes downward from the rotation axis 24 a toward the outside, said hand placing face facilitating in particular a natural position of the hand when the thumb and the index finger are disposed on different sides of the rotation axis 24 a. The primary shells 46 a, 48 a in the fixing plane 27 a are mutually aligned by means of at least an, in particular curved, tongue-and- groove connection 60 a, 62 a of the connecting housing unit 20 a, said tongue-and- groove connection 60 a, 62 a preferably being shaped so as be convex in terms of the rotation axis 24 a.
The interface device 18 a is disposed without one of the primary shells 48 a in FIG. 5. The docking interface 22 a as a main body has in particular a rotatory body in terms of the rotation axis 24 a. Alternatively, the main body of the docking interface 22 a is configured so as to be elongate parallel to the longitudinal axis 92 a and has in particular an elliptic or highly tapered cross section perpendicular to the rotation axis 24 a. The docking interface 22 a has depressions which are embedded in the main body, access ducts in particular for the socket of the primary shells 46 a, 48 a, and the separately configured fixing element 42 a, 44 a and/or ventilation openings.
It can furthermore more be derived from FIGS. 3 and 4 that the interface device 18 a comprises a transmission element 58 a. The transmission element 58 a of the interface device 18 a is in particular configured as an eccentric shank. The transmission element 58 a of the interface device 18 a is preferably configured so as to be separate from the drive device 14 a and the sanding device 12 a. The transmission element 58 a of the interface device 18 a is preferably press-fitted on to the driveshaft 26 a along the rotation axis 24 a, and is in particular connected in the rotationally fixed manner to the driveshaft 26 a. The eccentric, in particular conjointly with the already mentioned mounting plate, is preferably screwed to the transmission element 58 a of the interface device 18 a, and is in particular connected in the rotationally fixed manner to the transmission element 58 a of the interface device 18 a. Alternatively, the transmission element 58 a is configured so as to be integral to the driveshaft 26 a or integral to the eccentric of the sanding device 12 a. The docking interface 22 a in the fixing plane 27 a encompasses a bearing element 56 a of the drive device 14 a, said bearing element 56 a being specified for rotatably mounting the transmission element 58 a of the interface device 18 a. The driveshaft 26 a along the rotation axis 24 a preferably extends into the bearing element 56 a, in particular through the bearing element 56 a. The transmission element 58 a in the fixing plane 27 a preferably surrounds the driveshaft 26 a such that the driveshaft 26 a is in particular not in direct contact with the bearing element 56 a. The bearing element 56 a is in particular configured as a ball bearing. The transmission element 58 a of the interface device 18 a along the rotation axis 24 a extends preferably through the bearing element 56 a. The transmission element 58 a of the interface device 18 a, for axially form-fitting to the bearing element 56 a along the rotation axis 24 a, on a side of the fixing plane 27 a that faces the drive device 14 a comprises in particular a larger maximum transverse extent perpendicular to the rotation axis 24 a as on a side of the fixing plane 27 a that faces the sanding device 12 a. The fan 66 a of the sanding device 12 a is preferably disposed on the transmission element 58 a of the interface device 18 a, in particular so as to rotate centrically about the rotation axis 24 a. The fan 66 a is not illustrated in FIG. 4 so as to permit a view onto an internal wall 70 a of the primary shells 46 a, 48 a.
The fan 66 a is asymmetrically configured for forming a transmission element of the sanding device 12 a. The fan 66 a configures in particular the eccentric. In particular, the fan 66 a has an in particular solid disk-shaped base plate to which the blade assembly of the fan 66 a is fastened. The base plate preferably faces the docking interface 22 a and is in particular disposed in the same plane perpendicular to the rotation axis 24 a as the additional fixing elements 150 a, 152 a. The blade assembly of the fan 66 a preferably faces the sanding pad 132 a. The fan 66 a as an eccentric has in particular a central shank which in a plane perpendicular to the rotation axis 24 a is surrounded by the blade assembly. The central shank is in particular disposed on the base plate so as to be eccentric in relation to the base plate. The transmission element 58 a of the interface device 18 a preferably engages in the central shank of the fan 66 a and is in particular connected to the latter in the rotationally fixed manner (cf. FIG. 6), said central shank configuring the eccentric. The fan 66 a preferably has at least one fan counterbalance 148 a which is disposed within the blade assembly. The shape of the fan counterbalance 148 a is in particular adapted to a shape of the blade assembly. The base plate of the fan 66 preferably has a depression 162 a which in the direction of the rotation axis 24 a is disposed so as to be offset in relation to the remaining part of the base plate. The depression 162 a is in particular configured so as to be semi-annular. The depression 162 a and the fan counterbalance 148 a, in particular conjointly with part of the blade assembly, are preferably disposed on the depression 162 a. In a section of the fan 66 a along a plane comprising the rotation axis 24 a, the depression 162 a and the fan counterbalance 148 a are in particular disposed in a half of the fan 66 a that comprises a smaller volumetric proportion of the central shank configured as the eccentric. A height of the blade assembly on the depression 162 a, parallel to the rotation axis 24 a, is preferably smaller than a height of the remaining part of the blade assembly, in particular such that the entire blade assembly of the fan 66 a has a common terminal plane perpendicular to the rotation axis 24 a. The drive fan 64 a of the drive device 14 a and the fan 66 a of the sanding device 12 a in the direction of the rotation axis 24 a are disposed on different sides of the axial form-fitting element 28 a, 29 a, 30 a, 32 a. In particular, the docking interface 22 a at the boundary face terminates a receptacle space of the drive housing 16 a in which the drive fan 64 a is disposed. One end of the docking interface 22 a along the rotation axis 24 a delimits in particular a fan receptacle region 68 a in which the fan 66 a is disposed.
The sanding device 12 a comprises the fan 66 a for conveying away material subtracted in a sanding procedure. The internal wall 70 a of the connecting housing unit 20 a which for guiding an air flow generated by the fan 66 a delimits the fan receptacle region 68 a is configured so as to be funnel-shaped about the rotation axis 24 a of the driveshaft 26 a of the drive device 14 a. The fan receptacle region 68 a, proceeding from the plane which is perpendicular to the rotation axis 24 a and in which the additional fixing elements 150 a, 152 a are disposed, narrows in particular along the rotation axis 24 a in the direction of the sanding pad 132 a. The primary shells 46 a, 48 a of the connecting housing unit 20 a in the assembly plane 50 a parallel to the rotation axis 24 a at least partially surrounds the fan 66 a. In particular, the primary shells 46 a, 48 a surround the fan 66 a, in particular the blade assembly of the latter, in a direction parallel to the rotation axis 24 a. The primary shells 46 a, 48 a comprise in particular at least one base portion 180 a which is disposed between the fan 66 a and the sanding pad 132 a. The connecting housing unit 20 a has an air inlet 74 a. The air inlet 74 a is preferably disposed in the base portion 180 a of the primary shells 46 a, 48 a. The base portion 180 a has in particular a base surface which faces the fan 66 a and which runs so as to be at least substantially perpendicular to the rotation axis 24 a. A maximum transverse extent of the base surface perpendicular to the rotation axis 24 a is in particular smaller than a maximum transverse extent of the fan 66 a perpendicular to the rotation axis 24 a. The sanding pad holder 156 a protrudes in particular through the air inlet 74 a, in particular without contacting the primary shells 46 a, 48 a. The eccentric bearing 158 a, the transmission element 58 a and/or the eccentric are/is preferably disposed so as to be at least substantially flush with the base portion 180 a of the primary shells 46 a, 48 a, or are disposed so as to be set back relative to the base portion 180 a in the direction of the drive device 14 a.
The internal wall 70 a is segmented in the direction of the rotation axis 24 a. An outlet opening 78 a of the ejection port 76 a of the connecting housing unit 20 a, and the air inlet 74 a of the connecting housing unit 20 a, are disposed in different segments of the internal wall 70 a. The outlet opening 78 a is in particular disposed in an ejection segment 182 a of the connecting housing unit 20 a. The internal wall 70 a in the ejection segment 182 a preferably runs so as to be at least substantially perpendicular to the rotation axis 24 a. The ejection segment 182 a is in particular disposed in the plane having the additional fixing elements 150 a, 152 a. The connecting housing unit 20 a preferably comprises at least one guiding segment 184 a which in the direction of the rotation axis 24 a is disposed between the ejection segment 182 a and the base portion 180 a. The internal wall 70 a in the guiding segment 184 a runs in particular at an acute angle in relation to the rotation axis 24 a. The connecting housing unit 20 a preferably comprises at least one further guiding segment 186 a which is disposed between the guiding segment 184 a and the base portion 180 a. The internal wall 70 a in a further guiding segment 186 a in relation to the rotation axis 24 a has an angle that is larger than the angle of the guiding segment 184 a in relation to the rotation axis 24 a. The portions of the ejection segment 182 a, the guiding segment 184 a, the further guiding segment 186 a, and the base portion 180 a, and that portion of one of the primary shells 46 a, 48 a that configures the mating face, are in particular configured so as to be integral to one another.
The connecting housing unit 20 a has a conical spiral path 72 a which is disposed on the internal wall 70 a. The spiral path 72 a runs in particular from the air inlet 74 a of the connecting housing unit 20 a in the direction of the rotation axis 24 a to the ejection port 76 a of the connecting housing unit 20 a. The conical spiral path 72 a is in particular disposed in the guiding segment 184 a. FIG. 6 shows a cross section through the ejection segment 182 a, said cross section being perpendicular to the rotation axis 24 a. The fan receptacle region 68 a is preferably asymmetrically configured. The internal wall 70 a, in a plane perpendicular to the rotation axis 24 a, by virtue of the spiral path 72 a in particular has a spacing from the rotation axis 24 a that depends on an angular position in terms of the rotation axis 24 a. The outlet opening 78 a of the ejection port 76 a, conjointly with the internal wall 70 a, forms in particular a separation edge 82 a which run so as to be at least substantially parallel to the rotation axis 24 a. The spacing of the internal wall 70 a from the rotation axis 24 a is preferably at the minimum on the separation edge 82 a. The spacing of the internal wall 70 a from the rotation axis 24 a preferably continuously increases or remains constant in sections. The spacing of the internal wall 70 a from the rotation axis 24 a particularly preferably increases in a linear manner with a difference in terms of an angle in relation to an angular position of the separation edge 82 a, here illustrated in particular in the clockwise manner. Optionally, the spiral path 72 a is configured in only one of the primary shells 48 a, while the spacing of the guiding segment 184 a in the primary shell 46 a having the ejection port 76 a is kept constant in sections. The conical spiral path 72 a parallel to the rotation axis 24 a preferably has a pitch by way of which the spiral path 72 a in at most one rotation, preferably half a rotation, leads from the further guiding segment 186 a up to the outlet opening 78 a. The guiding segment 184 a of the internal wall 70 a that configures the spiral path 72 a, in a plane comprising the rotation axis 24, has an angle between 25 and 40°, preferably between 30° and 35°, in relation to the rotation axis 24 a.
The spiral path 72 a, in particular the guiding segment 184 a, in a projection along the rotation axis 24, preferably does not have any overlap with the fan 66 a. The further guiding segment 184 a in a projection along the rotation axis 24, to an extent of more than 50%, in particular to an extent of more than 75%, preferably to an extent of more than 90%, is preferably disposed in the interior of the fan 66 a. The blade assembly of the fan 66 a has a chamfer 86 a (see FIG. 3). The chamfer 86 a is disposed so as to be transverse to the rotation axis 24 a and so as to be at least substantially parallel to the further guiding segment 186 a of the internal wall 70 a. The internal wall 70 a in the further guiding segment 186 a, and in particular the chamfer 86 a, in a plane comprising the rotation axis 24 has an angle between 50° and 70°, in particular between 55° and 65° in relation to the rotation axis 24 a.
A further separation edge 80 a formed by the outlet opening 78 a of the ejection port 76 a of the connecting housing unit 20 a runs so as to be at least substantially perpendicular to the rotation axis 24 a. The further separation edge 80 a separates in particular the ejection segment 182 a from the guiding segment 184 a. The further separation edge 80 a in the region of the outlet opening 78 a continues in particular the spiral path 72 a up to the separation edge 82 a so as to be at a constant spacing from the rotation axis 24 a. The further separation edge 80 a at a high level along the rotation axis 24 a is in particular disposed between the base plate of the fan 66 a and the terminal plane of the blade assembly. The separation edge 82 a which is formed by the outlet opening 78 a of the ejection port 76 a of the connecting housing unit 20 a and which runs so as to be at least substantially parallel to the rotation axis 24 a is configured so as to be highly tapered and has a curvature radius of less than 10 mm, preferably of less than 3 mm, particularly preferably of less than 2 mm. The curvature radius of the separation edge 82 a lies in particular in a plane perpendicular to the rotation axis 24 a. The curvature radius of the separation edge 82 a, in particular independently of an exact shaping of the separation edge 82 a, describes a smallest imaginary circle which bears on the internal wall 70 a that faces the fan 66 a and on an internal wall of the ejection port 76 a. The tangents bearing on the internal wall 70 a and the internal wall of the ejection port 76 a, in a plane perpendicular to the rotation axis 24 a, preferably enclose an angle between 45° and 65°, preferably between 55° and 60°.
The duct longitudinal axis 84 a runs centrically through an ejection port 76 a and predefines in particular a primary flow direction of air through the ejection port 76 a. A projection of the duct longitudinal axis 84 a along the rotation axis 24 a preferably bears tangentially on an external contour of the fan 66 a. The projection of the duct longitudinal axis 84 a along the rotation axis 24 a preferably encloses an angle between 40° and 50°, particularly preferably between 44° and 46°, in relation to the assembly plane 50 a. An internal wall of the ejection port 76 a that is opposite the separation edge 82 a preferably extends from the assembly plane 50 a up to an ejection opening of the ejection port 76 a, wherein a spacing of this internal wall from the rotation axis 24 a in the assembly plane 50 a is adapted to the spacing of the spiral path 72 a and continuously increases in the direction of the ejection opening. The duct longitudinal axis 84 a of the ejection port 76 a of the connecting housing unit 20 a, and a plane perpendicular to the rotation axis 24 a, enclose an acute angle, in particular between 15° and 35°, preferably between 20° and 30°. The duct longitudinal axis 84 a, in particular proceeding from the outlet opening 78 a, is inclined in the direction of the rotation axis 24 a away from the sanding device 12 a. The ejection port 76 a at the outlet opening 78 a has in particular a rectangular cross section perpendicular to the duct longitudinal axis 84 a. The ejection port 76 a at the ejection opening preferably has a circular cross section perpendicular to the duct longitudinal axis 84 a. A protective device 146 a, in particular in the form of webs parallel to the duct longitudinal axis 84 a, for the avoidance of a finger and/or other foreign bodies being introduced into the ejection port 76 a, is preferably disposed in a portion of the ejection port 76 a that has the rectangular cross section.
The material collection device 116 a is in particular disposed on the region of the ejection port 76 a having the circular cross section. The material collection container 112 a has at least one opening 120 a for feeding the material into the material collection container 112 a. The opening 120 a of the material collection container 112 a is disposed in an opening plane 122 a. The opening plane 122 a, at least in a state of the material collection device 116 a disposed on the ejection port 76 a, is preferably able to be aligned so as to be at least substantially perpendicular to the longitudinal axis 92 a. The material collection container 112 a preferably comprises exactly one opening 120 a in the opening plane 122 a. Alternatively, the material collection device 116 a in the opening plane 122 a comprises a structural element which subdivides the opening 120 a into small sub-openings. The container longitudinal axis 114 a of the material collection container 112 a is preferably aligned so as to be at least substantially perpendicular to the opening plane 122 a. In particular, the material collection container 112 a has the largest longitudinal extent in the direction of the container longitudinal axis 114 a. The material collection container 112 a is in particular configured so as to be rotationally symmetrical about the container longitudinal axis 114 a.
The material collection device 116 a comprises at least one mounting unit 124 a for assembling the material collection container 112 a on the hand-held sanding machine 10 a. The mounting unit 124 a comprises a duct element 126 a for connecting to the ejection port 76 a of the hand-held sanding machine 10 a. The duct element 126 a is in particular provided to be disposed concentrically on the ejection port 76 a and in a state disposed on the ejection port 76 a has the same duct longitudinal axis 84 a as the ejection port 76 a. The duct longitudinal axis 84 a of the duct element 126 a, at least in the section plane running perpendicularly to the opening plane 122 a, is disposed so as to be transverse to the opening plane 122 a of the material collection container 112 a. The duct longitudinal axis 84 a, in a further section plane which is perpendicular to the section plane and to the opening plane 122 a, is disposed transversely to the opening plane 122 a. The duct longitudinal axis 84 a and the container longitudinal axis 114 a are in particular disposed so as to be skewed. The section plane in a configuration shown perpendicular to the rotation axis 24 a can be seen in FIG. 6. The further section plane is shown in FIG. 7, said further section plane here being in particular illustrated so as to be offset from the container longitudinal axis 114 a. The container longitudinal axis 114 a, in the state of the material collection device assembled on the hand-held sanding machine, is able to be disposed so as to be at least substantially parallel to the assembly plane 50 a, in particular whereby the container longitudinal axis 114 a is aligned so as to be parallel to the longitudinal axis 92 a. In an alignment of the container longitudinal axis 114 a parallel to the longitudinal axis 92 a, the further section plane is in particular disposed so as to be parallel to the assembly plane 50 a. The container longitudinal axis 114 a of the material collection container 112 a relative to the assembly plane 50 a encloses an angle which, when added to an angle between the duct longitudinal axis 84 a and the container longitudinal axis 114 a, forms a total angle between 80° and 100°, particularly preferably of 90°. The duct longitudinal axis 84 a in the section plane intersects the opening plane 122 a in particular at an angle between 40° and 50°, preferably between 44° and 46°. The duct longitudinal axis 84 a in the further section plane intersects the opening plane 122 a in particular at an angle between 15° and 30°.
The duct element 126 a is preferably pushed onto the ejection port 76 a along the duct longitudinal axis 84 a. An internal wall of the duct element 126 a and/or an external wall of the ejection port 76 a preferably have/has structural elements, for example webs or studs with an interference fit and/or a casing with an elastic material or the like, for a force-fitting connection between the duct element 126 a and the ejection port 76 a, said force-fitting connection being in particular able to be released and established manually. The material collection device 116 a is preferably disposed so as to be rotatable on the ejection port 76 a, in particular rotatable at least with a moderate effort in terms of force. The moderate effort in terms of force that is required for rotating the material collection device 116 a on the ejection port 76 a exceeds in particular a weight of the material collection device 116 a, in particular in a state of the material collection container 112 a in which the latter is filled with material subtracted by the sanding device 12 a. The moderate effort in terms of force is preferably able to be applied using one hand without a tool, said moderate effort in terms of force being in particular less than 200 N, preferably less than 125 N, particularly preferably less than 75 N. In particular, the material collection device 116 a remains in a current rotary position in terms of the ejection port 76 a without any manual activation. A relative position of the container longitudinal axis 114 a in relation to the rotation axis 24 a and/or in relation to the longitudinal axis 92 a is modified by rotating the material collection device 116 a about the duct longitudinal axis 84 a. The material collection device 116 a is disposed on the ejection port 76 a so as to be in particular pivotable relative to the drive housing 16 a. As a result, the material collection device 116 a during a sanding procedure can be advantageously flexibly aligned such that surfaces which are difficult to access can also be machined.
The mounting unit 124 a comprises an adapter housing 128 a. The adapter housing 128 a is configured so as to taper asymmetrically from the opening plane 122 a in the direction of the duct longitudinal axis 84 a. The duct element 126 a protrudes at least partially into the adapter housing 128 a. The duct element 126 a is in particular configured so as to be rotationally symmetrical in relation to the longitudinal axis 92 a. The duct element 126 a is preferably completely embedded in the adapter housing 128 a. The duct element 126 a and the adapter housing 128 a are particularly preferably integrally configured. The adapter housing 128 a preferably has a mounting element for fixing the material collection container 112 a on the adapter housing 128 a. The mounting element is configured as a thread, for example, preferably as an external thread. The material collection container 112 a has in particular an air-permeable container region 168 a for collecting the subtracted material, and a fastening ring 164 a for a fastening the container region 168 a to the mounting unit 124 a. The fastening ring 164 a preferably has a mounting element, for example a thread, in particular an internal thread, for connecting to the adapter housing 128 a. The container region 168 a is preferably fixed to the fastening ring 164 a by means of a latching mechanism and/or screw connection 166 a. The fastening ring 164 a delimits in particular the opening 120 a. The fastening ring 164 a and the adapter housing 128 a are preferably disposed so as to be at least substantially flush with one another. The adapter housing 128 a is in particular configured in the form of a truncated cone which sits obliquely on the fastening ring 164 a, the cone axis of said truncated cone being aligned so as to be coaxial with the duct longitudinal axis 84 a. A radius of a top face of the frustoconical adapter housing 128 a is preferably identical to an external radius of the duct element 126 a.
A maximum adapter longitudinal extent of a portion of the mounting unit 124 a that in the direction of the container longitudinal axis 114 a projects beyond the material collection container 112 a is at least substantially equal to a maximum adapter transverse extent of the mounting unit 124 a in the opening plane 122 a. A ratio of the adapter longitudinal extent to the adapter transverse extent is in particular between 50% and 80%, preferably between 60% and 70%. The adapter housing 128 a, in particular an inlet opening 130 a of the duct element 126 a, in a projection along the container longitudinal axis 114 a, protrudes in particular at the most slightly beyond the material collection container 112 a. A projection of the adapter housing 128 a along the container longitudinal axis 114 a lies in particular completely in the interior of a smallest imaginary square which just completely encloses a projection of the material collection container 112 a. A maximum distance of the inlet opening 130 a from the container longitudinal axis 114 a is in particular smaller than √2 times an external radius of the material collection container 112 a in the opening plane 122 a. In FIG. 6, the material collection container 112 a by the section plane is divided at a ratio of more than 1:4 such that the diameter of the material collection container 112 a is not illustrated here, and the adapter housing 128 a in the direction of the sanding device 12 a only appears to clearly protrude beyond the material collection container 112 a.
The outlet opening of the duct element 126 a occupies a maximum outlet opening width between 35% and 55%, in particular between 44% and 47%, of a maximum opening width of the opening 120 a in the opening plane 122 a. A ratio of an internal diameter of the duct element 126 a in comparison to the opening width of the opening 120 a is preferably between 35% and 60%, preferably between 45% and 55%. The container longitudinal axis 114 a preferably runs through an outlet opening of the duct element 126 a that faces the material collection container 112 a. The outlet opening of the duct element 126 a is preferably disposed in a plane which runs so as to be at least substantially perpendicular to the duct longitudinal axis 84 a and transverse to the opening plane 122 a. A geometric center of the outlet opening of the duct element 126 a, at least in the further section plane, is disposed so as to be in particular offset in relation to the container longitudinal axis 114 a, in particular offset by a value of 10% to 30% of the maximum opening width.
The inlet opening 130 a of the duct segment 126 a extends in a plane which runs so as to be at least substantially perpendicular to the duct longitudinal axis 84 a and in particular transverse to the opening plane 122 a. The inlet opening 130 a encompasses in particular the region of the ejection port 76 a having the circular cross section. The ejection port 76 a preferably protrudes into the duct element 126 a at least up to the container longitudinal axis 114 a. The inlet opening 130 a of the duct element 126 a is disposed so as to be spaced apart from the container longitudinal axis 114 a of the material collection container 112 a that runs perpendicularly to the opening plane 122 a.
FIG. 8 shows a flow chart of a method 170 a for assembling the hand-held sanding machine 10 a. The method 170 a comprises in particular a pre-assembly step 172 a. The method 170 a comprises in particular a joining step 174 a. The method 170 a preferably comprises a primary shell disposal step 176 a. The method 170 a comprises in particular a fixing step 178 a. In the pre-assembly step 172 a, the drive device 14 a and/or the sanding device 12 a are/is pre-assembled, in particularly in a mutually independent manner. In the pre-assembly step 172 a, the drive device 14 a is disposed in the drive housing 16 a, in particular in an assembly clamshell of the drive housing 16 a, of the hand-held sanding machine 10 a. In the joining step 174 a, the transmission element 58 a is preferably press-fitted on the driveshaft 26 a. In the joining step 174 a, the sanding device 12 a is preferably screwed to the transmission element 58 a. In the primary shell disposal step 176 a, a form fit, parallel to the rotation axis 24 a, between the connecting housing unit 20 a and the docking interface 22 a is formed by means of the axial form-fitting element 28 a, 29 a, 30 a, 32 a of the docking interface 22 a that is disposed in the fixing plane 27 a. In the primary shell disposal step 176 a, the connecting housing unit 20 a is disposed on the docking interface 22 a, so as to encompass the docking interface 22 a in the fixing plane 27 a perpendicular to the rotation axis 24 a. In the primary shell disposal step 176 a, the primary shells 46 a, 48 a are in particular attached to the docking interface 22 a. The mating faces of the primary shells 46 a, 48 a are in particular attached to the contact face 52 a, whereby the sanding device 12 a is at least partially disposed in the connecting housing unit 20 a. In the primary shell disposal step 176 a, the socket of the primary shells 46 a, 48 a is preferably pushed into the fixing recesses 34 a, 36 a of the docking interface 22 a. The primary shells 46 a, 48 a are attached to one another in particular in the assembly plane 50 a. In the fixing step 178 a, the separately configured fixing element 42 a, 44 a is disposed in the socket disposed in the fixing recess 34 a, 36 a and as a result presses the primary shells 46 a, 48 a on to one another and against the docking interface 22 a, in particular the contact face 52 a. The fixing elements 42 a, 44 a, the additional fixing elements 150 a, 152, and optionally drive housing fixing elements for connecting the assembly clamshells of the drive housing 16 a are all preferably assembled on the primary shells 46 a, 48 a, the docking interface 22 a and/or the drive housing 16 a from the same direction which is at least substantially perpendicular to the assembly plane 50 a.
Further exemplary embodiments of the disclosure are shown in FIGS. 9 to 14. The descriptions hereunder and the drawings are substantially restricted to the differences between the exemplary embodiments, wherein reference in terms of identically described components, in particular in terms of components with identical reference signs, can in principle also be made to the drawings and/or the description of the other exemplary embodiments, in particular those of FIGS. 1 to 8. In order for the exemplary embodiments to be differentiated, the suffix a is added to the reference signs of the exemplary embodiment in FIGS. 1 to 8. In the exemplary embodiments of FIGS. 9 to 14, the suffix a is replaced by the letters b to d.
FIG. 9 shows an external view, and FIG. 10 shows a longitudinal section, of a hand-held sanding machine 10 b configured as random orbital sander. The hand-held sanding machine 10 b comprises a sanding device 12 b which is in particular identical to the sanding device 12 a of the previous exemplary embodiment. The hand-held sanding machine 10 b has a drive device 14 b, in particular having an electric motor 134 b. The electric motor 134 b comprises in particular a nominal voltage of 18 Volt. An electrical supply interface 136 b of the drive device 14 b, and a longitudinal axis portion 90 b of a drive housing 16 b of the hand-held sanding machine 10 b, are preferably conceived for receiving an 18 Volt rechargeable battery pack 138 b. The hand-held sanding machine 10 b comprises an interface device 18 b having a docking interface 22 b and connecting housing unit 20 b. The connecting housing unit 20 b preferably has a counterbalance which compensates a torque caused by a weight of the rechargeable battery pack 138 b, in particular so as to avoid tilting of a rotation axis 24 b of the drive device 14 b. The counterbalance is preferably disposed on primary shells 46 b, 48 b of the connecting housing unit 20 b, in particular integrated in the latter. Optionally, the primary shells 46 b, 48 b for forming the counterbalance are made of metal, in particular by means of an aluminum-zinc die-casting process. Alternatively, the primary shells 46 b, 48 b as the counterbalance have metal deposits in a plastics material body. The counterbalance and the electrical supply interface 136 b are in particular disposed on different sides of a plane which is perpendicular to a longitudinal axis 92 b of the hand-held sanding machine 10 b and which contains the rotation axis 24 b. A portion of the connecting housing unit 20 b having the counterbalance preferably bears on a docking interface 22 b of the interface device 18 b. The portion of the connecting housing unit 20 b having the counterbalance has in particular a greater wall thickness than a portion of the connecting housing unit 20 b which is disposed on the side opposite the plane which is perpendicular to the longitudinal axis 92 b and which comprises the rotation axis 24 b. The portion of the connecting housing unit 20 b having the counterbalance preferably has an external face which faces the drive housing 16 b and in the direction of the sanding device 12 b is inclined by 15° to 30° in relation to a plane perpendicular to the rotation axis 24 b.
In terms of further features of the hand-held sanding machine 10 b, reference is to be made to FIGS. 1 to 8 and the description of said figures.
FIG. 11 shows an external view, and FIG. 12 shows a longitudinal section, of the hand-held sanding machine 10 c. The hand-held sanding machine 10 c has a drive device 14 c and a drive housing 16 c, both being in particular configured so as to be identical to the drive device 14 a and the drive housing 16 a, respectively, of the first exemplary embodiment. Alternatively, a sanding device 12 c of the hand-held sanding machine 10 c can also be combined, in particular without any further adaptation, with a drive device and a drive housing 16 c, as shown in the second exemplary embodiment. A sanding pad 132 c of the sanding device 12 c has a diameter, for example, between 70 mm and 80 mm, preferably between 77 mm and 78 mm. In a projection along a rotation axis 24 c of the drive device 14 c, the entire sanding device 12 c and an interface device 18 c of the hand-held sanding machine 10 c in particular lie in the interior of the drive housing 16 c. A docking interface 22 c of the interface device 18 c is in particular configured so as to be identical to the docking interfaces 22 a, 22 b of the preceding exemplary embodiments. A connecting housing unit 20 c of the interface device 18 c is in particular adapted to a height of the sanding device 12 c parallel to the rotation axis 24 c. A maximum transverse extent of the connecting housing unit 20 c perpendicular to the rotation axis 24 c is preferably only insignificantly larger than the maximum transverse extent of the docking interface 22 c, in particular larger by only a wall thickness, in particular double the wall thickness, of the connecting housing unit 20 c. A portion of the connecting housing unit 20 c which runs so as to be at least substantially parallel to the rotation axis 24 c is in particular disposed directly on the docking interface. Additional fixing elements 150 c, 152 c are in particular disposed in a plane which is parallel to the rotation axis 24 c and which has a contact face 52 c of the docking interface 22 c. A transmission element 58 c of the interface device 18 c engages through an optional fan 66 c along the rotation axis. The transmission element 58 c for driving the sanding pad 132 c is in particular configured so as to be integral to an eccentric of the sanding device 12 c. The transmission element 58 c encloses an eccentric bearing 158 c of the sanding device 12 c in particular in a plane perpendicular to the rotation axis 24 c. The eccentric bearing 158 c preferably encompasses a sanding pad holder 156 c of the sanding device 12 c in plane perpendicular to the rotation axis 24 c. The sanding pad holder 156 c receives in particular an appendage of the sanding pad 132 c in a direction parallel to the rotation axis 24 c.
In terms of further features of the hand-held sanding machine 10 c, reference is to be made to FIGS. 1 to 10 and the description of said figures
FIG. 13 shows an external view, and FIG. 14 shows a longitudinal section, of a hand-held sanding machine 10 d. The hand-held sanding machine 10 d is in particular configured as an orbital sander. The hand-held sanding machine 10 d has a drive device 14 d and a drive housing 16 d, both being in particular configured so as to be identical to the drive device 14 a and the drive housing 16 a, respectively, of the first exemplary embodiment. Alternatively, a sanding device 12 d of the hand-held sanding machine 10 d can also be combined, in particular without any further adaptation, with a drive device and a drive housing as shown in the second exemplary embodiment. A sanding pad 132 d of the sanding device 12 d is fastened to a connecting housing unit 20 d of an interface device 18 d of the hand-held sanding machine 10 d in particular by means of an elastic mounting 160 d. A fan 66 d of the sanding device 12 d is disposed in a fan housing of the sanding device 12 d, said fan housing being in particular disposed within the connecting housing unit 20 d. The elastic mounting 160 d is in particular disposed between the fan housing and the connecting housing unit 20 d. A transmission element 58 d of the interface device 18 d is preferably configured so as to be integral to an eccentric of the sanding device 12 d. An eccentric bearing 158 d of the sanding device 12 d encompasses in particular the transmission element 58 d in a plane perpendicular to a rotation axis 24 d of the drive device 14 d. The eccentric bearing 158 d is in particular disposed in a guide ring of the sanding pad 132 d, said guide ring being deflectable by the eccentric bearing 158 d, and is preferably connected in a force-fitting manner to the guide ring.
In terms of further features of the hand-held sanding machine 10 d, reference is to be made to FIGS. 1 to 12 and the description of said figures.

Claims

1. A hand-held sanding machine comprising:

at least one sanding device for receiving or configuring a sanding apparatus, the sanding device comprising at least one fan configured to convey away material subtracted in a sanding procedure;

at least one drive device configured to drive the sanding device; and

at least one connecting housing unit which at least partially receives the sanding device, the connecting housing unit comprising an internal wall that delimits a fan receptacle region and is configured for guiding an air flow generated by the fan, said internal wall being funnel-shaped about a rotation axis of a driveshaft of the drive device.

2. The hand-held sanding machine according to claim 1, the connecting housing unit further comprising:

an air inlet;

an ejection port; and

a conical spiral path disposed on the internal wall running inlet in a direction of the rotation axis from the air to the ejection port.

3. The hand-held sanding machine according to claim 1, wherein:

the connecting housing unit further comprises:

an ejection port with an outlet opening; and

an air inlet; and

the internal wall is segmented in a direction of the rotation axis, and the air inlet and the outlet opening are disposed in different segments of the internal wall.

4. The hand-held sanding machine according to claim 1, wherein the connecting housing unit further comprises an ejection port with an outlet opening that forms a separation edge, the separation edge running at least substantially perpendicular to the rotation axis.

5. The hand-held sanding machine according to claim 1, wherein the connecting housing unit further comprises an ejection port with an outlet opening that forms a separation edge, the separation edge running at least substantially parallel to the rotation axis, the separation edge configured so as to be highly tapered and to have a curvature radius of less than 10 mm.

6. The hand-held sanding machine according to claim 1, wherein at least one segment of the internal wall forms a spiral path that has an angle between 15° and 60° in relation to the rotation axis.

7. The hand-held sanding machine according to claim 1, wherein the connecting housing unit further comprises an ejection port having a duct longitudinal axis, the ejection port arranged such that the duct longitudinal axis is aligned, in a plane that is perpendicular to the rotation axis, so as to be at an acute angle relative to a longitudinal axis of the drive device.

8. The hand-held sanding machine according to claim 1, wherein the connecting housing unit further comprises an ejection port having a duct longitudinal axis, the ejection port arranged such that the duct longitudinal axis and a plane perpendicular to the rotation axis enclose an acute angle.

9. The hand-held sanding machine according to claim 1, wherein the connecting housing unit further comprises at least two primary shells at least partially encompassing the fan in an assembly plane that is parallel to the rotation axis.

10. The hand-held sanding machine according to claim 1, wherein the fan is asymmetrically configured for forming a transmission element of the sanding device.

11. The hand-held sanding machine according to claim 1, wherein the fan has a blade assembly with a chamfer disposed so as to be transverse to the rotation axis and at least substantially parallel to a segment of the internal wall.