DE102021134362B4 - Hand machine tool with a dust protection device and method for producing a dust protection device - Google Patents

Abstract

Machine tool, in particular a hand-held machine tool or semi-stationary machine tool, with a machine housing (20) in which a drive motor (11) for driving a tool holder (13) for a work tool (14), in particular a grinding tool or cutting tool, is accommodated, the machine housing (20) has at least one cooling air opening (25A, 25B) through which an air flow (LU) can flow, through which the air flow (LU) from an environment of the machine housing (20) into an interior of the machine housing (20) or from the interior of the machine housing ( 20) can flow into the environment, a dust protection device (80) with a filter element (81) for filtering out dirt, in particular releasably attachable, being arranged on the cooling air opening (25A, 25B), the filter element (81) being separated from the air flow ( LU) has air passage openings (82) through which air can flow, an outer edge region (83) of the filter element (81) being held on a holding frame (90) of the dust protection device (80), in particular being embedded in the holding frame (90), and wherein the filter element (81) has a support receptacle arrangement (85) with at least one support receptacle (86) suitable for supporting the filter element (81), which has a larger cross-sectional area than the air passage openings (82) and is at a distance from the outer edge region (83) and / or is designed as a recess on the outer edge region (83), characterized in that at least one support receptacle (86) or all support receptacles (86) of the support receptacle arrangement (85) is or are only present during the production of the dust protection device (80) and in the finished production State of the dust protection device (80) is or are closed by a curable material (AM).

Description

The invention relates to a machine tool, in particular a hand-held machine tool or semi-stationary machine tool, according to the preamble of claim 1 and a method for producing a dust protection device.

Such a hand-held machine tool in the form of a sawing machine is, for example, in DE 10 2015 225 748 A1 explained, wherein a filter carrier of the hand-held machine tool has receiving openings for receiving filter elements which act to prevent dust from entering a housing of the hand-held machine tool.

GB 741 918 A describes the production of filter carriers with frames that are manufactured using an injection molding process.

Another hand-held machine tool in the form of a sawing machine is, for example, in DE 10 2018 102 855 A1 explained. The dust protection device is designed as a component that can be removed from the machine housing and is located, for example, next to a connection for the energy storage. The filter element is embedded in the holding frame and is held by it. However, the production of such a filter element is complex.

It is therefore the object of the present invention to provide an improved machine tool and/or an improved dust protection device and/or a suitable manufacturing method for producing the dust protection device.

To solve this problem, a machine tool according to the technical teaching of claim 1 and a method according to the technical teaching of claim 23 are provided.

A basic idea is that the filter element is held by one or more mold support projections during the production of the dust protection device, in particular when casting or injection molding the holding frame and other holding components that optionally hold the filter element and/or that the at least one support receptacle serves to that a supporting projection of the dust protection device additionally supports and fixes the filter element at a distance from the holding frame.

The at least one mold support projection serves, for example, as a type of centering projection.

It is advantageous if there are several mold support projections on which the filter element is held immediately before and/or during the production of the holding frame and, if necessary, holding arms protruding in front of the holding frame, which will be explained later.

According to the invention it is provided that in the method for producing the dust protection device the at least one mold support projection is at least partially or completely removed from the at least one support receptacle before the curable material is introduced and the curable material is removed into the at least one support receptacle when it is introduced into the receiving cavity to form a support projection that engages in the at least one support receptacle in a form-fitting and/or cohesive manner to support the filter element. It is possible for the filter element to be sandwiched between the base mold and the closure mold, so that the at least one mold support projection can be easily removed from the at least one support receptacle, while the material for producing the holding frame and optionally at least one holding arm introduced into the receiving cavity, for example injected.

It is therefore advantageous that the filter element is held at a distance from the holding frame by one or more supporting projections during the production of the dust protection device and/or in the manufactured dust protection device.

It is possible, for example, for recesses to be provided on the outer edge region of the filter element, for example in the manner of notches, wave-shaped depressions or the like, into which a form-supporting projection is inserted in the sense of providing support during the production and/or during the pre-positioning of the filter element engages with the basic molding tool.

The mold support projection or projections may, for example, be designed in the form of mandrels, pins or the like.

In the following description, a single support projection or a single support receptacle is partly explained as an example. Of course, several support receptacles or support projections are advantageously designed in this way. However, it is also possible for one support receptacle to have a first configuration and another support receptacle to have a different, second configuration.

It is preferred if the holding frame completely surrounds the filter element and/or the filter element is completely surrounded by the holding frame. However, it is also possible for the holding frame to frame and support only a portion of the filter element, so to speak. It is therefore possible that a partial circumference of the filter element is not held by the holding frame or a holding frame.

The at least one support receptacle of the support receptacle arrangement is advantageously designed as a passage opening. However, it is also possible for the at least one support receptacle or at least one support receptacle of the support arrangement to be designed as a receiving trough or support recess on the filter element, i.e. h that a supporting projection acts on the filter element in the sense of supporting it, but does not penetrate the filter element.

It is advantageously provided that the holding frame completely surrounds the outer edge region of the filter element.

Furthermore, it is expedient if the outer edge region of the filter element is completely embedded in the holding frame.

It is advantageously provided that the filter element does not protrude in front of an outer circumference of the holding frame facing away from the filter element.

It is possible for the machine tool to have at least one support receptacle of the support receptacle arrangement with an inner contour surrounded or formed by the material of the filter element to more than 180°, in particular completely. It is therefore possible for the support receptacle to be designed, for example, in the manner of a hole in the filter element, the entire outer edge region of which is formed in a ring shape by the material of the filter element.

At this point it should be noted that the at least one support receptacle advantageously has an annular or oval cross-sectional shape. However, it is also possible for the support receptacle to have a polygonal cross-sectional shape, for example a triangular or rectangular cross-sectional shape or the like.

The filter element itself has air passage openings, so to speak recesses or receptacles. In the area of the holding frame, these can be filled, so to speak, by the material of the holding frame if the filter element is embedded in the holding frame. In addition, however, at least one support receptacle is provided, the cross section of which is larger than a respective cross section of the air passage openings.

It is advantageous if the filter element is designed as a sieve or filter fabric, with the air passage openings of the filter element being designed as meshes of the sieve or filter fabric.

A preferred concept provides that the filter element consists of a metal sieve or metal material. In contrast, it is advantageous if the holding frame is made of plastic. But it is also possible for the filter element to consist of a plastic material. The holding frame can easily be made of metal, in particular light metal, for example aluminum.

The holding arm explained below can also consist of the material of the holding frame and is in particular in one piece with the holding frame.

Stiffening or supporting the filter element away from the holding frame is advantageous.

It is preferred, for example, if the dust protection device has at least one holding arm which protrudes in front of the holding frame and is connected to the holding frame or is in one piece and on which the filter element is held. Preferably, several holding arms, for example two or three holding arms, are provided. The filter element is preferably embedded in the at least one holding arm. It is preferred if the holding arm projects in front of at least one flat side of the filter element, preferably in front of opposite flat sides of the filter element. Furthermore, it is advantageous if the filter element passes through the holding arm, so to speak.

One embodiment can provide that a free end region of the at least one holding arm projects freely in front of the holding frame. The holding arm can, for example, be designed in the manner of a holding finger.

However, it is preferred if the at least one holding arm connects frame sections of the holding frame to one another, in particular in the manner of a cross strut. For example, the holding arm connects opposing frame sections of the holding frame in the manner of a cross strut. It is possible that additional cross struts, in particular mutually parallel cross struts, are present in addition to these cross struts. Furthermore, it is advantageous if a cross strut runs parallel to a frame section of the holding frame.

It is in principle possible that the at least one support receptacle or one of the supports recordings of the support receiving arrangement is arranged away from the holding frame and away from the at least one holding arm. However, it is preferred if at least one support receptacle or all support receptacles of the support receptacle arrangement is or are arranged on a surface area of the filter element that is held and/or covered by the at least one holding arm. The surface area of the filter element covered by the holding arm is embedded, for example, in the holding arm or the material of the holding arm.

It is possible for the at least one holding arm to have a passage opening aligned with at least one support receptacle of the support receptacle arrangement. For example, the aforementioned closure body can be inserted into such a support receptacle, in particular an electrical component, for example a light-emitting diode. This electrical component or the closure body can be accommodated in a form-fitting manner in the passage opening of the holding arm.

However, it is preferred if at least one support receptacle or all support receptacles of the support receptacle arrangement in the area of the at least one holding arm is covered by the holding arm. The holding arm, for example a plastic material of the holding arm, covers the support receptacles that are located in the area of the holding arm and thus closes them. It is preferred if the material of the holding arm engages in the at least one support receptacle or penetrates the at least one support receptacle.

A further advantageous concept provides that the filter element is embedded in the at least one holding arm and/or the at least one holding arm engages in a form-fitting manner in the air passage openings of the filter element.

The job of the filter element is to retain or filter out dust. If the at least one support receptacle is open, air laden with dust can flow through the support receptacle. A measure to remedy this problem can provide that at least one support receptacle of the support receptacle arrangement is closed by a closure body, in particular a plug-in body and/or an electrical component. The closure body can be inserted into the support receptacle, for example. The electrical component can include, for example, a light-emitting diode, a switch or the like. The closure body is preferably a body separate from the holding frame.

It is advantageous if a support projection of the dust protection device connected to the holding frame engages in at least one support receptacle of the support receptacle arrangement, in particular penetrates the at least one support receptacle, so that the filter element is supported by the support projection. The support projection is therefore supported by the holding frame and in turn supports the filter element on the at least one support receptacle.

Furthermore, it is expedient if the supporting projection is made of the same material, in particular plastic, as the holding frame. The support projection is manufactured, for example, using the same manufacturing process with which the holding frame is manufactured.

An advantageous concept provides that the support projection is in one piece with the holding frame. For example, the support projection can protrude in front of the holding frame. Furthermore, the support projection can be arranged on a holding arm or can be integral with the holding arm, which will be described below.

According to the invention, it is provided that at least one support receptacle or all support receptacles of the support receptacle arrangement is or are only present during the production of the dust protection device and is or are closed in the finished manufactured state of the dust protection device by a hardenable material, in particular by the material from which the holding frame is made . In this context, for example, the holding arm can also be manufactured.

Supporting the filter element is particularly advantageous in the design of the dust protection device explained below.

It is possible for the holding frame, in particular longitudinal frame sections of the holding frame, and the filter element held thereon to have a curved or arcuate cross section or course. For example, the holding frame is adapted to a housing contour of the machine housing and has a correspondingly curved course.

It is also expedient if at least one support receptacle of the support receptacle arrangement is arranged, in particular centrally or approximately centrally, between opposing frame sections of the holding frame. If several support receptacles are provided between opposing frame sections of the holding frame, it is advantageous if these have the same distances from one another and/or the same distances from the frame sections. For example, it can be provided that support receptacles are arranged centrally between longer frame sections of the holding frame, which in particular have an arcuate or curved course net and have the same distances from shorter frame sections of the holding frame, which run between the longer frame sections.

One embodiment can provide that the dust protection device is integrally or firmly connected to the machine housing and the holding frame forms a part of the machine housing. This configuration can also be provided in connection with the configuration explained below.

It is namely possible for a dust protection device to be firmly connected to the machine housing or to be integral with it, while another dust protection device represents a structural unit that can be removed from the machine housing.

A preferred concept provides that the dust protection device can be releasably fixed to a filter holder of the machine housing using fixing means, in particular locking means and/or gripping contours. For example, form-fitting projections are provided on the dust protection device for engagement in form-fitting receptacles of the filter holder. Furthermore, it is expedient if, for example, hook contours are present on the dust protection device and the filter holder, which engage with one another when the dust protection device is mounted on the machine housing.

It is preferred if the fixing means, in particular the locking means and/or the rear gripping contours, are integral with the holding frame. For example, the fixing means, for example locking lugs, hook contours, form-fitting projections or form-fitting receptacles or the like, are formed from the material of the holding frame. This can be easily achieved, for example, in a casting process for producing the holding frame.

Furthermore, it is advantageous for the dust protection device, in particular the holding frame and the filter element, to be so rigid and flexible that it can be brought into engagement with the filter holder by deformation and, when mounted on the filter holder, with a predetermined internal tension in a clamp fit is held. This measure can also be advantageously provided in connection with the aforementioned locking means or positive locking contours.

In the case of a semi-stationary machine tool, it is preferably a cross-cut saw, a table saw or the like. If necessary, the semi-stationary machine tool can be brought to a specific location, for example a construction site. The semi-stationary machine tool is preferably designed so that it can be carried by one or two operators.

The hand-held machine tool is preferably a grinding machine, cutting machine or the like. A grinding machine or cutting machine is explained in the following description. The hand-held machine tool can also easily be a saw or sawing machine, a milling machine or the like.

The work tool is preferably a disc-shaped tool. The hand-held machine tool or machine tool is designed in particular to hold a disc-shaped work tool on the tool holder.

A protective hood or a protective cover is expediently provided on the tool holder or in the area of the tool holder. The protective cover preferably extends over a flat side of the disc-shaped work tool. It is possible for the protective cover to cover an outer edge area of the work tool.

Furthermore, it is advantageous if the machine tool has a dust removal connection to which a suction hose or a dust collection container can be connected. The dust removal connection includes, for example, a suction connection for a suction hose. For example, a suction hose or a dust collection container can be plugged into a plug-in section of the dust removal connection. The dust removal connection preferably has a tubular body.

• 1 eine perspektivische Schrägansicht einer Hand-Werkzeugmaschine mit einem Handgriffgehäuseteil in einer ersten Montage-Winkelposition bezüglich eines Antriebsgehäuseteils der Hand-Werkzeugmaschine,
• 2 die Hand-Werkzeugmaschine gemäß 1, jedoch mit dem Handgriffgehäuseteil in einer zweiten Montage-Winkelposition,
• 3 Hand-Werkzeugmaschine gemäß 1 von oben,
• 4 eine Explosionsdarstellung der Hand-Werkzeugmaschine gemäß 1 oder 2,
• 4 eine perspektivische Teilansicht des Handgriffgehäuseteils und des Antriebsgehäuseteils in nicht montierten Zustand,
• 6 eine zweite Hand-Werkzeugmaschine in Gestalt eines Trennschleifers mit dem Handgriffgehäuseteil der Hand-Werkzeugmaschine gemäß 1-5,
• 7 eine perspektivische Schrägansicht einer dritten Hand-Werkzeugmaschine in Gestalt einer Trennmaschine mit dem Handgriffgehäuseteil der Hand-Werkzeugmaschine gemäß 1-5,
• 8 eine perspektivische Schrägansicht einer vierten Hand-Werkzeugmaschine in Gestalt einer Bürstmaschine mit dem Handgriffgehäuseteil der Hand- Werkzeugmaschine gemäß 1-5,
• 9 eine Explosionsdarstellung eines Stromversorgungsanschlusses der Hand-Werkzeugmaschine gemäß vorstehender Figuren mit einer bezüglich einer Maschinenlängsachse der Hand-Werkzeugmaschine winkeligen Orientierung,
• 10 eine Explosionsdarstellung eines alternativen Stromversorgungsanschlusses für die Hand-Werkzeugmaschine mit Orientierung parallel zur Maschinenlängsachse,
• 11 eine perspektivische Schrägansicht einer Tüllen-Halterung von schräg vorn,
• 12 die Tüllen-Halterung gemäß 11, jedoch von schräg hinten,
• 13 einen in Arbeitsrichtung hinteren, geöffneten Abschnitt eines Maschinengehäuses der Hand-Werkzeugmaschine gemäß 1-5,
• 14 die Ansicht gemäß 13, wobei Komponenten des Stromversorgungsanschlusses gemäß 9 montiert sind,
• 15 eine Seitenansicht eines hinteren Abschnitts des Maschinengehäuses der Hand-Werkzeugmaschine gemäß vorstehender Figuren mit dem Stromversorgungsanschluss,
• 16 einen Querschnitt entlang einer Linie A-A durch die Ansicht gemäß 15 mit den Komponenten des Stromversorgungsanschlusses gemäß 9,
• 17 eine Ansicht entsprechend der 16, jedoch mit den Komponenten des Stromversorgungsanschlusses gemäß 10,
• 17B einen Querschnitt durch eine schematisch dargestellte Kabeltülle entsprechend der Schnittlinie der 16 und 17,
• 18 eine perspektivische Darstellung des Handgriffgehäuseteils mit noch nicht montierten Staubschutzeinrichtungen,
• 19 das Handgriffgehäuseteil mit einer montierten Staubschutzeinrichtung,
• 20 eine perspektivische Schrägansicht von hinten auf eine der Staubschutz Einrichtungen gemäß 18,
• 21 eine Seitenansicht der Staubschutzeinrichtung gemäß 20,
• 22 einen Querschnitt durch die Staubschutzeinrichtung gemäß 21, etwa entlang einer Schnittlinie B-B, die in die Staubschutzeinrichtung gemäß 20 eingezeichnet ist,
• 23 ein Detail D1 aus 22,
• 24 ein Detail D2 der Staubschutzeinrichtung gemäß 20, wobei der Ausschnitt etwa dem Detail D1 und somit einem Teilschnitt entlang der Schnittlinie B-B der Staubschutzeinrichtung gemäß 20 entspricht,
• 25 eine perspektivische Schrägansicht mit Formwerkzeugen zur Herstellung der Staubschutzeinrichtungen der 18-24,
• 26 einen Schnitt durch ein Grund-Formwerkzeug sowie ein Verschluss-Formwerkzeug bei der Herstellung der Staubschutzeinrichtung gemäß 22 etwa entlang einer Schnittlinie C-C durch das in 25 dargestellte Grund-Formwerkzeug,
• 27 einen Schnitt durch ein Grund-Formwerkzeug sowie ein Verschluss-Formwerkzeug bei der Herstellung der Staubschutzeinrichtung gemäß 20 etwa entlang einer Schnittlinie C-C durch das in 25 dargestellte Grund-Formwerkzeug,
• 28 eine perspektivische Schrägdarstellung eines weiteren Grund-Formwerkzeugs zur Herstellung einer alternativen Staubschutzeinrichtung,
• 29 das Grund-Formwerkzeug gemäß 29, mit einem daran gehaltenen Filterelement,
• 30 eine weiteres Grund-Formwerkzeug in Schrägdarstellung zur Herstellung einer weiteren Staubschutzeinrichtung,
• 31 Grund-Formwerkzeug gemäß 30 mit einem daran gehaltenen Filterelement.

Exemplary embodiments of the invention are explained below with reference to the drawing. Show it:

• 1 a perspective oblique view of a hand-held machine tool with a handle housing part in a first assembly angular position with respect to a drive housing part of the hand-held machine tool,
• 2 the hand machine tool according to 1 , but with the handle housing part in a second mounting angle position,
• 3 Hand machine tool according to 1 from above,
• 4 an exploded view of the hand machine tool according to 1 or 2 ,
• 4 a perspective partial view of the handle housing part and the drive housing part in the unassembled state,
• 6 a second hand-held machine tool in the form of a cut-off grinder with the handle housing part of the hand-held machine tool 1-5 ,
• 7 a perspective oblique view of a third hand-held machine tool in the form of a cutting machine with the handle housing part of the hand-held machine tool 1-5 ,
• 8th a perspective oblique view of a fourth hand-held machine tool in the form of a brushing machine with the handle housing part of the hand-held machine tool 1-5 ,
• 9 an exploded view of a power supply connection of the hand-held machine tool according to the above figures with an angular orientation with respect to a machine longitudinal axis of the hand-held machine tool,
• 10 an exploded view of an alternative power supply connection for the hand-held machine tool with orientation parallel to the longitudinal axis of the machine,
• 11 a perspective oblique view of a grommet holder from an angle in front,
• 12 the grommet holder accordingly 11 , but from diagonally behind,
• 13 a rear, open section of a machine housing of the hand-held machine tool in the working direction 1-5 ,
• 14 according to the view 13 , with components of the power supply connection according to 9 are mounted,
• 15 a side view of a rear section of the machine housing of the hand-held machine tool according to the above figures with the power supply connection,
• 16 a cross section along a line AA through the view according to 15 with the components of the power supply connection in accordance with 9 ,
• 17 a view corresponding to the 16 , but with the components of the power supply connection in accordance 10 ,
• 17B a cross section through a schematically shown cable grommet corresponding to the cutting line of the 16 and 17 ,
• 18 a perspective view of the handle housing part with dust protection devices not yet installed,
• 19 the handle housing part with a mounted dust protection device,
• 20 a perspective oblique view from behind of one of the dust protection devices 18 ,
• 21 a side view of the dust protection device according to 20 ,
• 22 a cross section through the dust protection device 21 , approximately along a cutting line BB, which is in the dust protection device according to 20 is marked,
• 23 a detail D1 22 ,
• 24 a detail D2 of the dust protection device according to 20 , whereby the cutout corresponds approximately to detail D1 and thus a partial section along the section line BB of the dust protection device 20 corresponds,
• 25 a perspective oblique view with molds for producing the dust protection devices 18-24 ,
• 26 a section through a basic mold and a closure mold in the manufacture of the dust protection device 22 approximately along a cutting line CC through the in 25 Basic mold shown,
• 27 a section through a basic mold and a closure mold in the manufacture of the dust protection device 20 approximately along a cutting line CC through the in 25 Basic mold shown,
• 28 a perspective oblique view of another basic mold for producing an alternative dust protection device,
• 29 the basic mold according to 29 , with a filter element held on it,
• 30 another basic mold in an oblique view for producing another dust protection device,
• 31 Basic mold according to 30 with a filter element held on it.

A hand-held machine tool 10 is designed, for example, as a grinding machine. The hand-held machine tool 10 has a drive motor 11, which drives a tool holder 13 for driving a work tool 14, for example a grinding tool or cutting tool, in particular a disc-shaped tool, via a gear 12, for example an angular gear and/or reduction gear. The drive motor 11 can be switched on using a switch 15, for example a pressure switch or can be switched off. Furthermore, a speed sensor 16 is provided, with which a speed, for example a maximum speed or a nominal speed, of the drive motor 11 can be adjusted. A display 17 is used to display operating states of the hand-held machine tool 10.

A power supply device 18 can be controlled using the speed sensor 16 and the switch 15. The power supply device 18 has, for example, power electronic switching elements, in particular a bridge circuit, for powering the drive motor 11. The drive motor 11 is preferably an electric motor, in particular an electronically commutated motor.

The drive motor 11, the transmission 12, the switch 15, the speed sensor 16, the display 17 and the power supply device 18 are accommodated in a machine housing 20 of the hand-held machine tool 10 and protected by it.

The tool holder 13 is located on a front longitudinal end region 21 of the machine housing 20 in the working direction AR. The machine housing 20 has a longitudinal shape and extends between the front longitudinal end region 21 and to a rear longitudinal end region 22 along a machine longitudinal axis ML.

A drive housing part 30 and a handle housing part 40 of the machine housing 20 are arranged one behind the other along the machine longitudinal axis ML and are connected to one another using a mounting interface 23. The handle housing part 40 protrudes from the drive housing part 30 in the direction of the machine longitudinal axis ML.

The machine longitudinal axis ML is angular to a rotation axis D, around which the tool holder 13 can be driven in rotation using the drive motor 11 and the gear 12, in this case at a right angle.

The drive motor 11 and the gearbox 12 are accommodated in the drive housing part 30. The drive housing part 30 comprises a drive housing body 35C, in which the drive motor 11 is essentially accommodated, and a housing body 38 which is fastened to the drive housing body 35C by means of screws 39 and which could also be referred to as a gear housing. The housing body 38 forms, so to speak, the front longitudinal end 21 of the machine housing 20.

The power supply device 18 as well as the switch 15 and the speed sensor 16 are arranged in the handle housing part 40.

A handle 24 is arranged on the drive housing part 30, the handle section 24A of which extends along a handle axis L24. The handle axis L24 extends transversely to the machine longitudinal axis ML, preferably at right angles transversely.

Using a pivot bearing 24C, the handle 24 is mounted such that it can pivot about a pivot axis S24 with respect to the machine housing 20. The pivot axes S24 and the machine longitudinal axis ML are angled to one another, for example at right angles. The pivot axis S24 and the handle axis L24 preferably run parallel to one another, with angular positions of these axes relative to one another being readily possible. In any case, an alignment of the handle axis L24 with respect to the machine housing 20 is maintained even when pivoting about the pivot axis S24.

Side legs 24B protrude at an angle from the handle section 24A and are connected to the machine housing 20 by means of the pivot bearing 24C.

A fixing device 24D is provided to fix the handle 24 in a stationary manner with respect to the machine housing 20. When the fixing device 24D is released, the handle 24 can be pivoted using the pivot bearing 24C, while in the fixing position of the fixing device 24D, the handle 24 is fixed with respect to the machine housing 20. For example, the fixing device 24D includes a clamping screw 24E with a handle that can be grasped by an operator.

The handle 24 is used to grip the hand-held machine tool 10 at its front end region 21.

Another handle section 25 is used to grip the hand-held machine tool 10 at its rear end region 22.

The handle section 25 is arranged, for example, on the handle housing part 40. The handle section 25 is oriented in the direction of the machine longitudinal axis ML and is therefore angled to the handle section 24A, for example at a right angle.

A protective body 25A lies opposite the handle section 25, so that a pass-through opening 25B is formed between the handle section 25 and the protective body 25A. At the rear longitudinal end region 22 and at an area facing the drive housing part 30, the handle section 25 and the protective body 25A are connected to one another by means of a connecting section 40V of the handle housing part 40 which is connected so that the pass-through opening 25B is closed at its longitudinal end regions.

A housing section 40G of the handle housing part 40, on which cooling air openings 26A, 26B and an operating area 27 are arranged, extends between the handle section 25 and the drive housing part 30. The operating area 27 is arranged between the cooling air openings 26A, 26B. The operating area 27 and the cooling air openings 26A, 26B are arranged on mutually angled housing walls of the handle housing part 40, the operating area 27 on an upper wall 40C and the cooling air openings 26A, 26B on side walls 40A and 40B that are angled relative to the wall 40C.

The handle section 25 extends as part of the upper wall 40C from the operating area 27 and in continuation of the side walls 40A and 40B to the rear longitudinal end area 22. Rear sections 40E of the side walls 40A and 40B, which extend between the operating area 27 and the connecting section 40V, form side legs of the Handle section 25. Rear sections 40F of the side walls 40A and 40B, which extend between the operating area 27 and the connecting section 40V, form side legs of the protective body 25A.

A rear portion 40E of a wall 40D opposite the top wall 40C forms a wall portion of the protective body 25A. Thus, the protective body 25A is connected to or has a part of the lower wall 40D, while the handle portion 25 is connected to or has a part of the upper wall 40C.

For the ergonomics and operation of the hand-held machine tool 10, an angular position of the handle section 25 with respect to the machine longitudinal axis ML and thus with respect to the handle axis L24 of the front handle 24 is relevant.

Furthermore, the ergonomic qualities of the hand-held machine tool 10 are also influenced by the position of the handle 25 with respect to a suction hose SL, which can be connected to a dust removal connection 29.

Using the dust removal connection 29 and/or via the dust removal connection 29, dust generated during operation of the hand-held machine tool can be conveyed away from the work tool 14, for example into a dust collection container or, as in the exemplary embodiment, to a vacuum cleaner (not shown), which is connected to the suction hose SL connected is.

The dust removal connection 29 includes a connection section 29A designed, for example, as a plug-in section, to which the suction hose SL can be connected. The dust removal connection 29 has a dust removal connection longitudinal axis S, which also forms a plug-in axis of the connection section 29A. The dust removal connection longitudinal axis S gives the suction hose SL an extension direction next to the machine housing 20, so that the suction hose SL connected to the dust removal connection 29 runs essentially parallel to the machine longitudinal axis ML from the front longitudinal end region 21 in the direction of the rear longitudinal end region 22 next to the machine housing 20, if it is connected to the dust removal connection 29.

The dust removal connection 29 is arranged on a protective cover 28 for covering the work tool 14.

The protective cover 28 is designed, for example, as a suction hood that can cover the work tool 14. On a side edge covering an outer circumference of the work tool 24 and/or a free end region of the protective cover 28, a brush or similar other flexible support device 28A is preferably arranged to rest on a surface over which the hand-held power tool 10 can be guided.

The appropriate or desired angular position can be achieved by mounting the machine housing 20 as explained below.

The handle housing part 40 can be mounted on the drive housing part 30 in mounting angular positions W1 and W2 shown by way of example with respect to the machine longitudinal axis ML ( 1 and 2 ).

The handle housing part 40 includes sub-housing elements 45A, 45B, which form the handle housing body 45C and can be positively mounted on the drive housing body 35C of the drive housing 40 in the form of a cylindrical housing body 35 in the respective mounting angular positions W1 and W2. The drive housing body 35C is disposed between the housing body 38 and the handle housing part 40.

For form-fitting fastening of the handle housing part 40 and the drive housing part 30 to one another, a positive locking contour 32 is arranged on the housing body 35 and thus on the drive housing part 30 and a counter-positive locking contour 42 is fixedly arranged on the handle housing part 40, in particular its partial housing elements 45A, 45B. Form the form-fitting contours 32, 42 integral components of the drive housing body 35C and the handle housing body 45C and are, for example, manufactured in one piece with their side walls, in particular as part of a casting process or injection molding process.

At the assembly interface 23, the drive housing part 30 and the handle housing part 40 with passage openings 31, 41 lie opposite one another, so that the interiors of the two housing parts 30 and 40 communicate with one another and components that are arranged in the drive housing part 30, for example the drive motor 11 and the gearbox 12, with Components that are arranged in the handle housing part 40, for example the power supply device 18, can be connected or are connected electrically and mechanically, for example the drive motor 11 with the power supply device 18.

The form-fitting contour 32 includes an axial form-fitting contour 33 in the form of a flange receptacle 33A, which extends around the passage opening 31. A flange projection 43A of an axial counter-form-fitting contour 43 of the counter-form-fitting contour 42 engages in a form-fitting manner in the flange receptacle 33A. Through the axial positive locking contour 33 and the axial counter-positive locking contour 43, the drive housing part 30 and the handle housing part 40 are connected or can be connected to one another in a tension-resistant manner with respect to the machine longitudinal axis ML.

For rotation-proof assembly and fixation of the handle housing part 40 with respect to the machine longitudinal axis ML on the drive housing part 30, a rotary-positive locking contour 34 or several rotary-positive-locking contours 34 of the positive-locking contour 32 are used, in which counter-rotational positive-locking contours 44 of the counter-positive-locking contour 42 engage in a form-fitting manner. The rotational positive locking contours 34 include, for example, radial positive locking receptacles 34A that extend from the flange receptacle 33A into the passage opening 31 and/or radial positive locking receptacles 34A that extend radially inward with respect to the machine longitudinal axis ML. Radial positive locking projections 44A of the counter-rotational positive locking contours 44 engage in this in a form-fitting manner. For example, the radial positive locking receptacles 34A and the radial counter positive locking projections 44A have a trapezoidal or triangular shape.

The radial counter-positive locking projections 44A protrude, for example, in front of the flange projection 43A.

The passage openings 31, 41 are limited by housing walls 37 and 47 of the drive housing part 30 and the handle housing part 40. The passage openings 31, 41 are arranged on end walls 36, 46 of the drive housing part 30 and the handle housing part 40. For example, the passage opening 41 is circumferentially limited by the flange projection 43A, which is arranged or formed on the end wall 46. The passage opening 31 passes through the end wall 36, on which the flange receptacle 33A is formed.

A flange projection 33C lies opposite the end wall 36, so that the flange receptacle 33A is formed between the flange projection 33C and the end wall 36.

Circumferential walls 37 and 47 of the drive housing part 30 and the handle housing part 40, which is formed by the sub-housing elements 45A, 45B, are aligned with each other when the machine housing 20 is fully assembled. The peripheral walls 37 and 47 have contact sections 37A, 47A, which rest against one another in the assembled state of the machine housing 20. Flat sections 37C, 47C of the peripheral walls 37 and 47 lie against one another. Furthermore, corner regions 37D and 47D of the peripheral walls 37 and 47, which extend between the flat sections 37C and 47C, also lie against one another, so that the adjacent peripheral walls 37 and 47 also form anti-rotation contours that prevent the handle housing part 40 from rotating relative to the drive housing part 30 prevent the machine longitudinal axis ML in the assembled state of the machine housing 20.

It is preferred if, in the assembled state of the machine housing 20, recesses and recesses in the peripheral walls engage one another, so that the peripheral walls 37 and 47 lie tightly against one another in the assembled state of the machine housing 20. For example, a recess 37B, in particular a recess, is provided on the peripheral wall 37, into which a support projection or engagement projection 47B of the peripheral wall 47 engages when the positive locking contours 32 are in engagement with the counter-positive locking contours 42. At this point it becomes clear that the contact sections 37A, 47A are also components of the form-fitting contours 32 and the counter-form-fitting contours 42.

The assembly of the housing 20 is based on 4 clearly. The partial housing elements 45A, 45B are joined together transversely to the machine longitudinal axis ML, so that on the one hand they accommodate the components to be accommodated in the interior of the handle housing part 40, in particular the current supply device 18, and on the other hand the positive locking contours 32 and the counter-positive locking contours 42 come into engagement with one another. For example, parts of the housing arranged on the partial housing elements 45A, 45B penetrate Flange projection 43A sequentially engages the flange receptacle 34A on the drive housing body 35C. In addition, the rotational positive locking contours 34 and rotational counter positive locking contours 44, which are fixed in a rotationally fixed manner with respect to the machine longitudinal axis ML, come into engagement with one another, so that by fixing the partial housing elements 45A, 45B to one another, the positive locking contours 32 and 42 are held firmly together and the drive housing part 30 with the handle housing part 40 is secured in a tensile and torsion-proof manner in relation to the machine's longitudinal axis.

For this fixation, positive fastening means, for example latching elements not shown in the drawing, in particular latching hooks, and/or cohesive fastening means, for example gluing or welding the two partial housing elements 45A and 45B, can be provided. However, an advantageous measure provides that the partial housing elements are connected to one another by mounting means 49. The mounting means 49 include screw receptacles 49A, 49B on the partial housing elements 45A, 45B, into which screws 49C can be screwed. For example, the screw receptacles 49A include push-through openings for inserting the screws 49C, which can be screwed into the screw receptacles 49B, which are designed, for example, as blind holes and/or as screw domes and/or have screw threads.

Thus, the handle housing part 40 and the drive housing part 30 are firmly connected to one another and the hand-held power tool 10, in particular its machine housing 20, optimally withstands the loads that occur during operation.

The so-called angle-optimized assembly of the drive housing part and the handle housing part, which can be selected for each application, can also be implemented in other machine concepts, which is shown by the 6 , 7 , 8th becomes clear.

Hand machine tools 10X, 10Y, 10Z are shown there, each of which has the handle housing part 40 already explained.

This handle housing part 40 is mounted on different drive housing parts 30X, 30Y and 30Z, each of which has the mounting interface 23 and in which the drive motor 11 and optionally the gear 12 are arranged. The gearbox 12 and the drive motor 11 can be designed for the same or different speed ranges, powers and the like in the hand-held machine tools 10, 10X, 10Y, 10Z.

It is possible for one or more of the components arranged in the handle housing part 40, for example the switch 15, the speed sensor 16, the display 17 and the power supply device 18, to be used in the hand-held machine tools 10X, 10Y, 10Z. However, it is also possible for one or more of these components to be designed alternatively, i.e. H. that, for example, a power supply device 18 with different performance values is used.

The hand machine tools 10, 10X, 10Y, 10Z form a modular system BS.

Insofar as previously described components are present in the hand-held machine tools 10X, 10Y and 10Z, they have the same or similar reference numbers as in the hand-held machine tool 10, the reference numbers being partially provided with letters X, Y and Z to distinguish different features.

The hand-held machine tool 10X is, for example, a cut-off machine whose work tool 14X is designed as a cutting disc. The work tool 14X is arranged under a protective cover 28X. A handle 24X projects transversely from the drive housing part 30X in the area of the tool holder 13, so that its handle axis L24 extends transversely to the machine longitudinal axis ML. In the exemplary embodiment, the handle housing part 40 is fastened and mounted in the mounting angular position W1 on the drive housing part 30X, so that the handle axis L24 extends transversely to a plane in which the handle section 25 and the support body 25A lie. In the mounting angular position W2, in which the drive housing part 30X and the handle housing part 40 are mountable to one another, this plane may be parallel to a plane in which the handle axis L24 extends.

The hand-held machine tool 10Y is, for example, a cutting machine, for example for producing wall slots or the like. A work tool 14Y, which can be releasably attached to the tool holder 13 of the hand-held machine tool 10Y, is designed, for example, in the manner of a saw blade or a cutting disk. The work tool 14Y is disposed under a protective cover 28Y, which can be gripped by an operator at its outer periphery to guide the hand-held power tool 10Y. Thus, the protective cover 28Y forms a handle 24Y of the hand-held power tool 10Y.

The hand-held machine tool 10Y has, for example, a guide body 19Y, for example a so-called guide table or guide tion slide, the underside of which forms a guide surface 19Y1, which can be placed on a surface, and with which the hand-held machine tool 10Y can be guided along the surface. The drive housing part 30Y forms a component of a drive unit arranged on the protective cover 28Y, which is pivotally mounted with respect to the guide body 19Y by means of a pivot bearing 19Y2 in order to set an immersion depth of the work tool 14Y, with which the work tool 14Y is immersed in the ground, for example in a workpiece . For this purpose too, it is advantageous if an operator can grasp the hand-held machine tool 10Y by the handle 25 on the one hand and the handle 24Y on the other hand.

The ergonomically most favorable relative position of the handle 25 to the handle 24Y and/or the guide surface 19Y1 can already be set during assembly of the hand-held machine tool 10Y using the assembly interface 23, with an assembly angular position W2 being shown as an example in the drawing. It can easily be advantageous for some applications or users if, on the one hand, the handle 25 and the protective body 25A and, on the other hand, the axis of rotation D lie in mutually parallel planes, in which case the assembly angular position W1 is produced by mounting the handle housing part 40 on the drive housing part 30Y .

For example, a brushing tool can be arranged as a working tool 14Z on the tool holder 13 of the hand-held machine tool 10Z. The work tool 14Z is arranged under a protective cover 28Z. A handle 24Z is arranged on the protective cover 28Z, the handle portion 24A of which extends along a handle axis L24. The drive housing part 30Z is detachably or permanently attached to the protective cover 28Z, with the axis of rotation D of the tool holder 13 on the one hand and the handle 25 and the protective body 25A on the other hand lying in mutually angled, for example rectangular planes. The drive housing part 30Z and the handle housing part 40 are connected to one another in the assembly angular position W2, for example. The assembly angular position W1 of the drive housing part 30Z and the handle housing part 40 can easily be established using the assembly interface 23, so that other ergonomic properties result.

The hand-held machine tools 10, 10X, 10Y, 10Z can in principle be designed for operation without an electrical supply network, for example cordless hand-held machine tools. In this case, for example, an interface for connecting an electrical energy storage device, for example a battery pack, is provided, for example on the connecting section 40V of the machine housing 20.

In the case of the hand-held machine tools 10, 10X, 10Y, 10Z, however, a power supply connection 50 with a power cable 51 is arranged on the connecting section 40V and/or a rear wall 48 of the machine housing 20 at its rear longitudinal end region 22.

The power cable 51 has, for example, conductors 52, for example wires, which are guided in a jacket or protective jacket in a manner known per se. For example, a connecting plug 51A for connection to a power supply network N is provided on a free end region of the power cable 51 that is remote from the hand-held machine tool 10.

The power cable 51 is guided into the machine housing 20 using a cable grommet 70. The cable grommet 70 has a cable receiving section 71 for receiving the power cable 51. The cable receiving section 51 has a longitudinal shape and extends along a sleeve longitudinal axis TL. A cable passage opening 74 of a grommet body 73 of the cable grommet 70 also extends along this grommet longitudinal axis TL, so that the power cable 51 accommodated in the cable passage opening 74 is aligned at the outlet of the cable grommet 70 remote from the machine housing 20 along the grommet longitudinal axis TL and is accordingly guided away from the machine housing 20 in accordance with the longitudinal extent or sleeve longitudinal axis TL.

The sleeve longitudinal axis TL has an exit angle AW to the machine longitudinal axis ML. It is preferred if the exit angle AW is selected such that the sleeve longitudinal axis TL extends away from the machine housing 20 in the direction of the suction hose SL when this is attached to the dust removal connection 29. You can see this situation, for example, in the 1-3 particularly good. The exit angle AW is, for example, related to a longitudinal center plane of the machine housing 20 (see 3 ), so that a generous operating area BB or working space remains free for an operator on the side next to the handle section 25 of the handle housing part 40. Both the power cable 51 and the suction hose SL are guided away from the operator, who grips the hand-held machine tool 10, for example with his right hand on the handle section 25.

Even in the mounting angle position W2 ( 2 ), the exit angle AW is advantageous because the power cable 50 is directed away from the operating area BB, in particular in the direction of the dust removal connection 29 and/or the suction hose SL. In this configuration too, the power cable 51 is guided away from the operator when he grips the machine with his right hand on the handle section 25.

Now, in principle, it would easily be possible for the cable grommet 70 to be held directly in a holder receptacle 54 of the machine housing 20, for example on the rear wall 48, and to be clamped there, for example. For example, the holder receptacle 54 has a receiving groove, which in itself serves to hold the grommet holder 60, 60B, but in principle a holding flange 78 of the cable grommet 70 can also engage. A clamp suitable for clamping the cable grommet 70 in the holder receptacle 54 and crossing the cable grommet 70, for example in the manner of a bracket, could be fastened, for example, with screws 56 which are screwed into screw receptacles 55 which are arranged next to the holder receptacle 54.

• Die Halterung-Aufnahme 54 dient zur Aufnahme einer Tüllen-Halterung 60 oder wahlweise einer Tüllen-Halterung 60B, an denen jeweils die Kabeltülle 70 gehalten werden kann. Die Tüllen-Halterungen 60, 60B sind an sich baugleich, wobei sie die Kabeltülle 70 in unterschiedlichen Austrittswinkeln AW bezüglich des Maschinengehäuses 20 halten.
• Die Tüllen-Halterungen 60, 60B weisen eine Tüllen-Aufnahme 61, 61B zum Halten der Kabeltülle 70 sowie einen Kabel-Halteabschnitt 62 zum Halten eines vor die Kabeltülle 70 vorstehenden Abschnitts des Netzkabels 51.
• Die Tüllen-Aufnahmen 61, 61 B umfassen eine Formschlussaufnahme 68, zum Beispiel eine Flanschaufnahme, in die ein Formschlussvorsprung 78, zum Beispiel der genannte Halteflansch der Kabeltülle 70 formschlüssig eingreifen kann. Somit ist die Kabeltülle 78 zugfest bezüglich der Tüllen Längsachse TL an der Tüllen-Halterung 60 oder 60B gehalten.

However, a flexible assembly concept of the hand-held machine tool 10 provides for a different approach:

• The holder receptacle 54 is used to hold a grommet holder 60 or optionally a grommet holder 60B, on which the cable grommet 70 can be held. The grommet holders 60, 60B are actually identical in construction, and they hold the cable grommet 70 at different exit angles AW with respect to the machine housing 20.
• The grommet holders 60, 60B have a grommet receptacle 61, 61B for holding the cable grommet 70 and a cable holding section 62 for holding a section of the power cable 51 which projects in front of the cable grommet 70.
• The grommet receptacles 61, 61 B include a form-fitting receptacle 68, for example a flange receptacle, into which a form-fitting projection 78, for example the aforementioned holding flange of the cable grommet 70, can engage in a form-fitting manner. The cable grommet 78 is thus held on the grommet holder 60 or 60B in a tensile manner with respect to the grommet longitudinal axis TL.

On the cable holding section 62, holding contours 62A, for example flange-like structures or rib structures, are provided for holding the section of the power cable 51 which protrudes in front of the cable grommet 70.

The grommet holders 60, 60B each have a pair of grommet holding bodies, for example grommet holding bodies 63, 64 and 63B, 64B, respectively, the grommet holding bodies 63, 64 and 63B, 64B being complementary to one another and between an open position , in which the cable grommet 70 with the power cable 51 arranged therein can be inserted into the grommets receptacle 61, 61B, and a closed position can be adjusted in which the grommet receptacle 61, 61B is closed and the cable grommet 70 and the power cable 51 in the respective Grommet holder 60, 60B are held in a form-fitting, tensile manner with respect to the grommet longitudinal axis TL and supported transversely to the grommet longitudinal axis TL.

The grommet holding bodies 63, 64 and 63B, 64B can be plugged into one another and screwed together, with the already mentioned screws 56 being screwed into the screw receptacles 55. The screws 56 are inserted through screw receptacles 65A, 65B on the grommet holding bodies 63, 64 or 63B, 64B, which are aligned with one another when the grommet holding bodies 63, 64 or 63B, 64B are connected to one another.

An advantageous concept provides that the screw receptacles 65A, 65B are designed as pairings of plug-in receptacle and plug-in projection, i.e. H. that, for example, the screw receptacles 65A are designed as plug-in projections and the screw receptacles 65B are designed as plug-in receptacles for these plug-in projections, which can be inserted into one another.

Furthermore, plug-in projections 67, for example plug-in pins, are provided on the grommet holding bodies 63, 63B, which can be inserted into plug-in receptacles 67B of the grommet holding bodies 64, 64B.

The screw receptacles 65A, 65B and the plug-in projections 67 and their associated plug-in receptacles are preferably arranged at opposite longitudinal end regions of the grommet holders 60, 60B, for example the screw receptacles 65A, 65B on the cable holding section 62 and plug-in projections 67 and the plug-in receptacles 67B close to the Grommet holder 61, 61B.

When screwing or clamping, the screw receptacles 65A, 65B as well as the plug-in projections 67 and the plug-in receptacles 67B form guides by means of which the grommet holding bodies 63, 64 and 63B, 64B are guided together.

Furthermore, the grommet holding bodies 63, 64 and 63B, 64B advantageously form a clamp holder for the cable grommet 70 as well as a section of the power cable 51 which projects in front of the cable grommet 70 and which is accommodated in the cable holding section 62.

The cable grommet 70 and the section of the power cable 51 projecting in front of the cable grommet 70 are clamped between the grommet holding bodies 63, 64 and 63B, 64B, for example, by on screw the screws 56 into the screw holders 55.

Fastening sections 66 are provided on the outer circumferences of the grommet holders 60, 60B, which are accommodated in the holder receptacle 54 of the machine housing 20 in the assembled state. The fastening sections 66 have positive-locking contours 66A on their outer circumferences, which are in positive engagement with corresponding counter-positive-locking contours 54A of the holder receptacle 54. For example, the form-fitting contours 66A and the counter-form-fitting contours 54A include flange projections on one part of the holder receptacle 54 and the fastening section 66, which are engaged with flange receptacles on the other part of the holder receptacle 54 and the fastening section 66.

The form-fitting contours 66A and the counter-form-fitting contours 54A advantageously form anti-rotation contours, by means of which the cable grommet 70 is held on the grommet holder 60, 60B in a rotation-proof manner with respect to the grommet longitudinal axis TL.

The cable holder sections 62 of the grommet holders 60 and 60B extend along cable holder section longitudinal axes HL.

The fastening sections 66 extend along fastening section longitudinal axes BL.

The cable holding section longitudinal axes HL and the fastening section longitudinal axes BL are in the present case parallel to the machine longitudinal axis ML, but an oblique inclination, for example downwards, is also easily possible.

The grommet holders 60, 60B extend along longitudinal axes TA, the longitudinal axis TA of the grommet holder 60 having the exit angle AW to the cable holding section longitudinal axis HL and the fastening section longitudinal axis BL, while in the case of the grommet holder 60B the Longitudinal axis TA is aligned with the other two longitudinal axes HL and BL.

The grommet holders 60, 60B thus specify the respective exit angle AW for the cable grommet 70 and thus the power cable 51. By simply selecting a suitable grommet holder 60 or 60B, the exit angle AW can be adjusted and/or fixed when assembling the hand-held machine tool 10.

In the case of the cable grommet 70, a cable receiving section 72 which accommodates the power cable 51 and the mounting section 71 intended for mounting on the grommet holder 60 or 60B are arranged in alignment with one another, i.e. linearly one behind the other along the grommet's longitudinal axis TL.

However, the exit angle AW can also easily be achieved by a corresponding design of a cable grommet, which is indicated by an exit angle AW2 of a cable grommet 70B. The cable grommet 70B has a cable receiving section 72 for the power cable 51 along a grommet's longitudinal axis TL and a mounting section angled thereto for receiving or mounting on the grommet holder 60 or 60B.

It is also easily possible that, for example, the grommet holding body 64B can be attached to the holder receptacle 54 without the grommet holding body 63B in order to hold the cable grommet 70 directly. If the holder receptacle 54 has an oblique inclination with respect to the machine longitudinal axis ML at the exit angle AW, it can, together with the grommet holding body 64, hold the cable grommet 70 with the exit angle AW with respect to the machine longitudinal axis ML.

Dust protection devices 80, 80B can advantageously be releasably attached to the cooling air openings 26A, 26B. The dust protection devices 80, 80B have a filter element 81, for example a metal sieve, which is close-meshed, i.e. has very small air passage openings 82, and is therefore suitable for retaining dust that is contained in the air streams LU flowing into the cooling air openings 26A, 26B is. The filter element 81 is, for example, plate-shaped and flexible in bending.

The filter element 81 is held on its outer edge region 83 by a holding frame 90. The holding frame 90 has longer longitudinal frame sections 91, which are connected to one another by shorter frame sections 92. Overall, the frame sections 91, 92 form a substantially rectangular shape. The shorter frame sections 92 are preferably slightly rounded. The transition areas between the frame sections 91 and 92 also preferably have curves on the outside.

Furthermore, two holding arms 93, for example, which are designed in the manner of transverse ribs or transverse webs, extend between the frame sections 91. Windows 94 are formed between each holding arm 93 and a frame section 92 and between adjacent holding arms 93, in which the filter element 81 is free so that an air stream LU can flow through it.

The holding arms 93 run parallel to the shorter frame sections 98. It is preferred if the holding arms 93 and the frame sections 98 are approximately the same distance from one another in a direction parallel to the longitudinal direction of the longer frame sections 91. The aforementioned windows 94 between the holding arms 93 and the frame sections 98 are therefore approximately the same size. In any case, the windows 94 are advantageously positioned so that they each face a cooling air opening 26A or 26B. The holding arms 93 can advantageously be arranged where no cooling air opening 26A or 26B is provided on the machine housing 20.

The filter element 81 is embedded in the material of the holding frame 90, i.e. in the material of the frame sections 91 and 92 as well as the material of the holding arms 93, so that it is optimally supported by the holding frame 90 and its holding arms 93.

This material of the holding frame 90 is, for example, a plastic material, in particular a thermoplastic plastic material.

The outer edge region 83 of the filter element 81 is therefore embedded in the material of the holding frame 90, so that, for example, the air passage openings 82 there are penetrated by the material of the holding frame 90 or that the material of the holding frame 90 penetrates and / or closes the air passage openings 82 .

The outer edge region 83 of the filter element 81 is located within the holding frame 90, but does not protrude from an outer circumference 95 of the holding frame 90.

The dust protection devices 80, 80B are detachably accommodated in filter holders 100 of the machine housing 20.

The cooling air openings 26A, 26B are arranged on a bottom 104 of a respective filter holder 100. Support sections 106 of the base 104, which lie opposite the holding arms 93, run between the cooling air openings 26 8, 2 6B. The holding arms 93 are therefore supported or can be supported on the support sections 106. The windows 94 or passage openings of the holding frame 90, at which the filter element 81 is free and without overlap, are in any case arranged between the support sections 106, so that the air flow LU can flow through the filter elements 81 in the area of the windows 94 and into the cooling air openings 26A, 26B.

The dust protection devices 80 can be detachably attached to the filter holders 100 and fixed there using fixing means 101. Thus, a dust protection device 80 can be easily removed from the filter holder 100 and cleaned, for example if it is dirty. Furthermore, it is possible to use dust protection devices 80 suitable for applications, for example with filter elements 81 that have different filter effects.

The filter holder 100 has an inner circumferential contour 105 into which the outer circumference 95 or the outer circumferential contour of the respective holding frame 90 fits in a form-fitting manner.

The bottom 104 has a curved shape, with the curvature running around the machine longitudinal axis ML. A corresponding curvature is also provided in the dust protection device 80, i.e. H. that, for example, the frame sections 91 have a curved course.

Nevertheless, an optimal hold of a respective dust protection device 80 in the filter holder 100 can be achieved using the fixing means 101.

The fixing means 101 include, for example, holding projections 97 which are arranged on the longer frame sections 91 and have distances from the shorter frame sections 92 and which engage in holding receptacles 107 of the filter holder 100. The holding receptacles 107 are arranged close to the inner circumferential contour 105, for example. Therefore, for example, the holding projections 97 form plug-in projections and the holding receptacles 107 form plug-in receptacles.

Furthermore, gripping contours 98 and 108 of the fixing means 101 are provided on the holding frame 90 or the dust protection device 80 filter holder 100. The rear gripping contours 98 and 108 are provided, for example, by a hook projection and a hook receptacle on one of the shorter frame sections 92 or the inner circumferential contour 105 of the filter holder 100 opposite this. On an opposite side of the dust protection device 80 or the inner circumferential contour 105, further gripping contours and / or locking contours are provided, for example a locking lug 99 of the dust protection device 80 and a locking receptacle 109 of the filter holder 100. The locking lug 99 has, for example, an actuating section for actuation by a Operator towards a release position in which the dust protection device 80 can be removed from the filter holder 100. For this purpose, after releasing the locking of the locking lug 99, the dust protection device 80 is pivoted, for example, around the rear gripping contours 98 and 108 and then the rear gripping contours 98 and 108 are disengaged.

Since the filter element 81 does not protrude in front of the outer circumference 95 of the holding frame 90, but should even be at a distance from it, the production of the support device 80 is difficult in itself, since direct edge support of the filter element 81 is required when producing the holding frame 90, in particular in the case of a Injection molding process is not possible. To make matters worse, the holding frame 90 has a curved shape, which makes it even more difficult to support the filter element 81 during the production of the holding frame 90.

A mold tool arrangement 200 suitable for use in an injection molding machine (not shown) provides a remedy here. The mold tool arrangement 200 is arranged or can be arranged in a casting arrangement or injection molding machine in order to carry out the method explained below.

The molding tool arrangement 200 comprises a basic molding tool 201, which, together with a closure tool 202, encloses a receiving cavity 203, which is suitable for producing all components of the dust protection device 80 that are different from the filter element 81, for example using a curable material AM, in particular one thermoplastic plastic.

The receiving cavity 203 has frame sections 204 for producing the holding frame 90 and holding arm sections 205 for producing the holding arms 93, the frame sections 204 and the holding arm sections 205 communicating with one another, so that the material AM, when introduced, in particular injected, into the receiving cavity 203, flows through all sections 204 and 205.

Furthermore, the material AM also penetrates into cavities 207 for producing the holding projections 97, a cavity 208 for producing the rear gripping contour 98, for example a hook-shaped cavity 208 and finally into a cavity 209 for producing the locking lug 99.

So that the filter element 81 is not wetted by the material AM in the area of the windows 94, frame projections 213 are provided on the molds 201 and 202, between which the filter element 81 is sandwiched.

However, the filter element 81 is to be inserted into the receiving cavity 203, in particular the basic mold 201, in such a way that its outer edge region 83 is at a distance from the inner circumference 206 of the receiving cavity 203.

In order to hold the filter element 81 in this position, the filter element 81 has a support receptacle arrangement 85 with support receptacles 86. In the base mold 201, mold support projections 210 are provided, which protrude from a bottom 214 of the base mold 201 at least when the filter element 81 is introduced into the receiving cavity 203. The bottom 214 forms a frontal boundary of the receiving cavity 203.

The shape support projections 210 are provided in the area of the holding arm sections 205 and the support receptacles 86 are spaced accordingly from the outer edge region 83 of the filter element 81 so that the shape support projections 210 can engage in the support receptacles 86. A diameter D86 and thus a cross section of the support receptacles 86 is significantly larger than a diameter and thus a cross section of the air passage openings 82, which is so narrow and small that it is not individually dimensioned in the drawing. The filter element 81, for example, has a fine mesh and can therefore extremely effectively prevent dust from entering the interior of the machine housing 20.

If the filter element 81 is held on the mold support projections 210 as described, the closure mold 202 is adjusted to the base mold 201 in the sense of closing the receiving cavity 203.

The filter element 81 is then advantageously clamped and/or sandwiched by the frame projections 213.

The mold support projections 210 can then be moved completely or partially out of the support receptacles 86 using guides 211, so that the material AM that subsequently penetrates into the receiving cavity 203 to produce the holding frame 90 and the holding arms 93 can at least partially penetrate into the support receptacles 86 to form supporting projections 96 there.

However, it is also possible that at least one of the mold support projections 210 is not moved out of the support receptacle 86 assigned to it, but rather remains in the support receptacle 86 while the material AM is being introduced into the receiving cavity 203. Such a mold support projection 210 then protrudes, for example, into a cavity 212 of a closure mold 202B that is otherwise similar to the closure mold 202, so that the material AM flows around the mold support projection 210 and, for example, passage openings 96B are formed on the holding arms 93. This then creates a dust protection device 80B, in which the support receptacles 86 are aligned with the passage openings 96B.

A closure body, for example a light-emitting diode or the like, can be inserted into such a passage opening 96B in order to close the passage opening 96B. Based on the overview of the 25 It becomes clear that the base mold 201 can be selectively closed with the closure mold 202 or the closure mold 202B to produce the dust protection devices 80 or 80B.

Of course, shape support projections do not necessarily have to intervene in the area of holding arms and/or not necessarily at large distances from the outer edge region 83 of a filter element 81 in the sense of support. This is indicated by base molds 201C and 201D, which can each be closed with the closure mold 202 in order to close their respective receiving cavities 203 and produce dust protection devices.

The basic molds 201C and 201D correspond to the basic mold 201 already described, apart from the arrangement of their mold support projections.

In the case of the basic molding tool 201C, for example, mold support projections 215 are provided, which are arranged in the area of the frame sections 204, preferably close to one of the holding arm sections 205. A further mold support projection 216 is arranged, for example, in the area of the holding arm section 205, in particular along its center. Thus, the mold support projections 215, 216 are arranged in corner regions of a holding triangle and can optimally hold the filter element 81C, which has a support receiving arrangement 85C with support receptacles 80C corresponding to the arrangement of the mold support projections 215, 216 (see 29 ).

In the base mold 201D, the mold supporting projection 216 is also provided. Mold support projections 217 are arranged similarly to the mold support projections 215 close to the holding arm portion 205, which does not have a mold support projection 216, but closer to the inner circumference 206. Corresponding to the arrangement of the mold support projections 215, 217 are support receptacles 86D of a support receptacle assembly 85D a filter element 81D is present, which can be attached and/or plugged into the mold support projections 215, 217. The filter element 81D is advantageously held on its outer circumference by the mold support projections 217.

Claims (23)

Machine tool, in particular a hand-held machine tool or semi-stationary machine tool, with a machine housing (20) in which a drive motor (11) for driving a tool holder (13) for a work tool (14), in particular a grinding tool or cutting tool, is accommodated, the machine housing (20) has at least one cooling air opening (25A, 25B) through which an air flow (LU) can flow, through which the air flow (LU) from an environment of the machine housing (20) into an interior of the machine housing (20) or from the interior of the machine housing ( 20) can flow into the environment, a dust protection device (80) with a filter element (81) for filtering out dirt, in particular releasably attachable, being arranged on the cooling air opening (25A, 25B), the filter element (81) being separated from the air flow ( LU) has air passage openings (82) through which air can flow, an outer edge region (83) of the filter element (81) being held on a holding frame (90) of the dust protection device (80), in particular being embedded in the holding frame (90), and wherein the filter element (81) has a support receptacle arrangement (85) with at least one support receptacle (86) suitable for supporting the filter element (81), which has a larger cross-sectional area than the air passage openings (82) and is at a distance from the outer edge region (83) and / or is designed as a recess on the outer edge region (83), characterized in that at least one support receptacle (86) or all support receptacles (86) of the support receptacle arrangement (85) is or are only present during the production of the dust protection device (80) and in the finished production State of the dust protection device (80) is or are closed by a curable material (AM). machine tool Claim 1 , characterized in that at least one support receptacle (86) of the support receptacle arrangement (85) is designed as a passage opening or as a support recess on the filter element (81). machine tool Claim 1 or 2 , characterized in that the holding frame (90) completely surrounds the outer edge region (83) of the filter element (81) and / or the filter element (81) does not protrude in front of an outer circumference of the holding frame (90) facing away from the filter element (81). Machine tool according to one of the preceding claims, characterized in that at least one support receptacle (86) of the support receptacle arrangement (85) is one of the mate rial of the filter element (81) has an inner contour that is surrounded or formed to more than 180 °, in particular completely. Machine tool according to one of the preceding claims, characterized in that the filter element (81) is designed as a sieve or filter fabric, the air passage openings (82) of the filter element (81) being designed as meshes of the sieve or filter fabric. Machine tool according to one of the preceding claims, characterized in that the filter element (81) consists of a metal sieve or metal material and/or the holding frame (90) consists of plastic. Machine tool according to one of the preceding claims, characterized in that the dust protection device (80) has at least one holding arm (93) which projects in front of the holding frame (90) and is connected or is in one piece with the holding frame (90) and on which the filter element (81) is held . machine tool Claim 7 , characterized in that a free end region of the at least one holding arm (93) projects freely in front of the holding frame (90). machine tool Claim 7 or 8th , characterized in that the at least one holding arm (93) connects frame sections of the holding frame (90) to one another, in particular in the manner of a cross strut. Machine tool according to one of the Claims 7 until 9 , characterized in that at least one support receptacle (86) or all support receptacles (86) of the support receptacle arrangement (85) is or are arranged on a surface area of the filter element (81) held and/or covered by the at least one holding arm (93). Machine tool according to one of the Claims 7 until 10 , characterized in that the at least one holding arm (93) has a passage opening aligned with at least one support receptacle (86) of the support receptacle arrangement (85). Machine tool according to one of the Claims 7 until 11 , characterized in that at least one support receptacle (86) or all support receptacles (86) of the support receptacle arrangement (85) in the area of the at least one holding arm (93) is covered by the holding arm (93), in particular that the material (AM) of the holding arm ( 93) engages in the at least one support receptacle (86) or penetrates the at least one support receptacle (86). Machine tool according to one of the Claims 7 until 12 , characterized in that the filter element (81) is embedded in the at least one holding arm (93) and / or the at least one holding arm (93) engages in a form-fitting manner in the air passage openings (82) of the filter element (81). Machine tool according to one of the preceding claims, characterized in that at least one support receptacle (86) of the support receptacle arrangement (85) is closed by a closure body, in particular a plug-in body and/or an electrical component. Machine tool according to one of the preceding claims, characterized in that a support projection (96) of the dust protection device (80) connected to the holding frame (90) engages in at least one support receptacle (86) of the support receptacle arrangement (85), in particular the at least one support receptacle (86) penetrates, so that the filter element (81) is supported by the support projection. machine tool Claim 15 , characterized in that the support projection (96) consists of the same material (AM) as the holding frame (90) and / or is in one piece with the holding frame (90). Machine tool according to one of the preceding claims, characterized in that the hardenable material (AM), through which the at least one support receptacle (86) or all support receptacles (86) of the support receptacle arrangement (85) is or are closed, is the material (AM), from which the holding frame (90) consists. Machine tool according to one of the preceding claims, characterized in that the holding frame (90), in particular longitudinal frame sections (91) of the holding frame (90), and the filter element (81) held thereon have a curved or arcuate cross section or course. Machine tool according to one of the preceding claims, characterized in that at least one support receptacle (86) of the support receptacle arrangement (85), in particular centrally or approximately centrally, is arranged between opposing frame sections (91, 92) of the holding frame (90). s Machine tool according to one of the preceding claims, characterized in that the dust protection device (80) is integrally or firmly connected to the machine housing (20) and the holding frame (90) forms a part of the machine housing (20) or that the dust protection device (80) is based on fixing means (101), in particular locking means and / or Behind-grip contours can be releasably fixed to a filter holder (100) of the machine housing (20). machine tool Claim 20 , characterized in that the fixing means (101), in particular the locking means and/or the rear gripping contours, are integral with the holding frame (90). machine tool Claim 20 or 21 , characterized in that the dust protection device (80), in particular the holding frame (90) and the filter element (81), are so rigid and flexible that they can be brought into engagement with the filter holder (100) by deformation and in the Filter holder (100) mounted state is held in a clamp fit with a predetermined internal tension. Method for producing a dust protection device (80) for a machine tool, in particular a hand-held machine tool (10) or semi-stationary machine tool, which has a machine housing (20) in which a drive motor (11) for driving a tool holder (13) for a work tool ( 14), in particular a grinding tool or cutting tool, is accommodated and the machine housing (20) has at least one cooling air opening (25A, 25B) through which an air flow (LU) can flow, through which the air flow (LU) from an environment of the machine housing (20) into an interior of the machine housing (20) or from the interior of the machine housing (20) into the environment, the dust protection device (80) having a filter element (81) for filtering out dirt, which has air passage openings through which the air flow (LU) can flow (82), wherein an outer edge region (83) of the filter element (81) is held on a holding frame (90) of the dust protection device (80), in particular is embedded in the holding frame (90), the method comprising: - inserting the filter element ( 81) in a basic mold (201), the basic mold (201) having at least one mold support projection (210) which is used to support the filter element (81) for producing, in particular during production, the holding frame (90) engages in a support receptacle (86) of a support receptacle arrangement (85) of the filter element (81), which has a larger cross-sectional area than the air passage openings (82) and is at a distance from the outer edge region (83) and / or as a recess on the outer edge region ( 83), - closing the base mold (201) by a closure mold (202), so that the base mold (201) and the closure tool enclose a receiving cavity (203) for producing the holding frame (90), in which the filter element (81) is accommodated, an outer edge region (83) of the filter element (81) protruding into the receiving cavity (203) for the holding frame (90), - introducing, in particular spraying, a curable material (AM), in particular plastic , into the receiving cavity (203), - removing the closure mold (202) from the base mold (201) after the hardenable material (AM) has hardened and - removing the dust protection device (80) from the base mold (201) , characterized in that the at least one mold support projection (210) is at least partially or completely removed from the at least one support receptacle (86) before the curable material (AM) is introduced and the curable material (AM) is removed during the introduction into the receiving cavity (203) penetrates into the at least one support receptacle (86) to form a support projection which engages in the at least one support receptacle (86) in a form-fitting and/or cohesive manner to support the filter element (81).

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