EP1340591B1 - Electric hand tool - Google Patents

Abstract

The device has a suction device and a dust collection device (2) with a filter arrangement. The dust collection device has a housing part (8) with a guide arrangement for the filter arrangement and an opening with a cover for removing the filter arrangement and for emptying dust collected within the housing part. The cover can be opened and closed for filter removal with the housing part mounted on the tool housing (6).

Description

The invention relates in particular to an electric hand tool an eccentric or oscillating or reciprocating drivable electric grinding tool, such as one in particular Triangular grinder, random orbit sander, or one Planer, a varnish cutter or jigsaw, etc. with a Dust extraction device and one with the Interacting dust extractor Dust collection device, in which the Dust pickup device from an essentially rigid, forming a dust collecting space on the machine housing attachable housing component is formed in the Filter medium is receivable. Such a tool is from DE 299 23 577U known

The invention is intended to be exemplified below with reference to a Electric grinder are explained without, however a restriction to this should be made. The In principle, invention can be applied to all hand tools can be used where there is dust or chips.

Dust removal or reception facilities are at Electric grinders, for example in the form of a Grinding dust transport channel to which a vacuum cleaner hose can be coupled, or in the form of a dust collecting bag educated.

It often proves to be a hindrance if the device is included a vacuum cleaner hose is connected because this is the Manageability and maneuverability when grinding significantly restricted. Common vacuum cleaner hoses are also not too long, so when working overhead additional difficulties may arise. Also the Use of paper or textile materials formed dust collection bag is disadvantageous because of this the dimensions of the grinder not infrequently on the Enlarged twice. In addition, changing is the attachable and detachable dust bags complex and unsatisfactory.

Such an electric hand tool is, for example, from known from DE 198 00 045 A1. Furthermore also reveals DE 41 21 256 A1 an electric tool with a container for dust, the container being designed as a dust bag and at the rear end of the housing by plugging it onto the Exhaust duct can be attached. To the dust bag too stabilize, a holding device is provided which on Connection cable of the Sanders is attached. Here too must the dust bag can be removed from the device for emptying and In addition, such a dust bag is not available mechanical damage protected.

Furthermore, it is known to provide a rigid housing-forming component which can be attached directly to the machine housing and which can be arranged directly on the machine housing, preferably on the underside of the machine housing, and is held thereon. In this way, the dust collecting space is not, as when using a dust bag, protruding to the rear or from the sides of the machine housing of the electric hand tool and is therefore arranged in a manner that is objectionable, but instead nestles compactly against the machine housing. Such a design is for example from the
DE 198 31 383 A1 known. The dust collection container is designed here as a rigid plastic container which is plugged onto the exhaust air duct of a sander. The filter is firmly connected to the housing cover of the dust collector, so that the dust collector has to be removed from the device to change the filter. The cover must then be removed and replaced with a new cover with a new filter. The same applies to the emptying of the dust collector, whereby the replacement of the lid can be omitted in this case.

In addition, DE 40 38 634 C2 describes a grinding device known in which a collecting container is provided, wherein here openings in the collection container through mesh as Filters are spanned.

Finally, from DE 299 23 577 U1 Generic electrical hand tool known, with a rigid housing component as a dust collection space in the Filter media on several sides on the inside Housing component can be applied, with the filter medium a flat section of a filter material Dimensions of the inside of the housing component accordingly is foldable.

The filtering of the exhaust air is thus via a flat filter ensured that applied to a stable frame is. For emptying the container or changing or The entire dust collection container must be cleaned be removed from the device.

Proceeding from this, the present invention is the Task based on an electric hand tool of the above to improve the way that the Emptying and changing the filter significantly easier is.

The object is achieved by an electric hand tool with the features of claim 1 solved. Through the Providing an opening through a flap or a Lid is lockable, can not be achieved longer distance from the dust collector Machine for emptying and changing the filter necessary is. In principle, it is also possible to Dust collection container firmly with the hand tool itself connect.

However, it can also be provided that the Housing component detachable with the machine housing in its Mounting position is connected, in particular with this can be positively locked.

The housing component forming the dust collection space can be on be held on the machine housing in any way, in particular, it can also be firmly connected to it. Before fastening with screws, a clamped or a form-fitting arrangement prefers. It proves to be advantageous if that Housing component in its mounting position on Machine housing can be locked. If so, it turns out turn out to be an advantage if a manually removable Resilient locking element is provided, which is preferably on a rear end side of the device in the longitudinal direction is arranged.

If the housing component is detachably connected to the Machine housing, this has the advantage that it for example against a suction port Dust extraction device, for example a vacuum cleaner, can be exchanged.

The housing component can be essentially as Injection molded plastic part and in particular consist of two shells. The use of a Clamshell house has manufacturing technology Benefits.

In a preferred embodiment of the invention The electric hand tool is the one that forms the dust essentially rigid housing component on the Machine housing, preferably on its Workpiece-facing underside, can be pushed on. It can be on this way a compact appearance of the Electric hand tool are generated and also that Postponing the housing component by a user felt uncomplicated and easy to carry out.

In a further embodiment of the invention that is Housing component essentially elongated, with a longitudinal extension, which in the assembly position with the Longitudinal extension of the electric hand tool collapses and the housing component has one oriented towards the tool Face on which it is with the suction device a connection piece is connectable, one of them opposite end side, two opposite one another Long sides and one facing away from the machine housing Bottom side and one facing the machine housing Cover page. Between the tool, for example one triangular or round sanding pads or one rectangular sanding disc, and the Dust collection device is usually a kind Dust transport channel formed. This dust transport channel mouths directly into the dust collection room. The Dust transport channel preferably runs on the underside of the electric hand tool facing the workpiece and is a further development of the invention of the machine housing self-educated. He prefers in the to Electrical hand tool oriented end face of the Gehausebauteils.

It can be provided that the opening to Change the filter or empty the dust collector the end side is arranged. Especially if the Opening at the end can make emptying easy Can be realized by opening by opening the lid or pivoting the flap is released and the tool with its longitudinal extension is held vertically where e.g. the sanding plate up and that Point the power cord down. This way it can be special just the dust from the dust collector into one any end catch container can be transferred.

In addition, it is also particularly simple in this way the filter can be changed by opening the flap and the filter from the opening and the Dust collector is pulled out towards the Long axis of the electric hand tool, but none here Disability caused by the tool itself.

In particular, it can be provided that between the Machine housing and the top side at least in some areas a distance remains in the mounting position and that Machine housing designed as a handle in this area is, the housing component forms such a grip protection against touching a user of the electric hand tool with a workpiece or the tool, e.g. the Sanding disc itself.

By designing the machine house in the area of Handle as well as the housing component can be ergonomic Recessed grip with simultaneous hand protection are formed, as they are sometimes with modern electric hand tools. is already provided.

A user's gripping and guiding hand therefore before resting on the workpiece and therefore before Injuries protected, which is particularly advantageous. On the underside of the machine housing facing the workpiece this can advantageously be wave-shaped trained gripping contour for the fingers of a user of the Train equipment.

The preferably slot-shaped air outlet openings of the Housing component can in itself over all sides of the Dust collection room can be arranged. According to a preferred In the embodiment, they essentially extend continuously across the bottom and / or the top of the Housing component and / or in the long sides and can over the entire transverse direction of each side run. By designing the slit-shaped Air outlet openings can also be certain Design accents can be set.

It is particularly preferred, however, the air outlet opening to be attached to the deck side, since this makes it easier Introducing and sealing the filter media by means of a hinged flap at the top to close the opening is possible.

Especially if a filter insert is used, the on a frame is arranged, it can be provided that the Frame in the area of the deck inside the Housing component comes to rest and in the area of the frame sealing takes place. This way it can be special simply achieved good dust filtering from the air be and at the same time a simple insertion of the Filters can be ensured by simply opening the flap is pivoted above and the filter in the corresponding Grooves is inserted.

Such a configuration is considered by a user found particularly easily.

It can be provided that the lid for Closing the opening in an articulated manner on the housing component is set, particularly at its towards the End facing the top side. The lid can then be moved around a substantially horizontal pivot axis upwards fold. It can be provided that both the closed position via locking means with the Housing component is lockable, but it can also be Detent provided in one or two open steps his. For example, a first stage of opening be provided for emptying the Dust collector serves. In a second stage then be provided that the flap all the way up is pivoted and a special in this position simple changing of the filter medium is made possible. In particular, however, the lid can have the advantage to always remain on the device, even when changing or cleaning the filter insert, which is easy from behind is pulled out of the housing. In this way it is Lid captively connected to the housing component.

Finally, it can be provided that a Sealing edge is provided with a circumferential Sealing edge in the housing component corresponds and the Seals filter against the housing component, the Sealing edge integrated in particular in the guide means is or is formed by this itself.

This ensures that all the exhaust air through the Filters get through before coming out of the housing component can leak. A particularly good and effective one Exhaust air cleaning is ensured in this way.

The filter medium can consist of a filter insert consisting of a frame and a filter firmly attached to it be formed, the frame in particular a can have a rectangular shape. With the frame it can Filter media then in housing grooves as a guide inserted or on gangways as a guide to be put off. Generally, inside the Housing component support means provided as a guide be, this web or rib-shaped inner protrusion can own. The filter medium can do this act as a pleated filter, the pleated filter attached to its two ends, i.e. the front and the end side, have a filter cover made of plastic can. The pleated filter can be covered so that it is closed on all sides.

The cover can be the shape of the pleated filter correspond.

The rectangular frame can provide that the filter is symmetrical and thus a Incorrect installation can be avoided relatively safely.

Finally, it can be provided that the housing component is tightly connected to the machine housing, wherein in Housing component on the front or the corresponding side of the machine housing one circumferential seal, in particular an O-ring, is provided against which the other component rests and is pressed will ensure that a tight connection is ensured.

To make working with the To ensure electrical hand tools can be provided that the housing component is not towards its bottom side protrudes beyond the tool itself.

It also proves advantageous if the housing component has a flat, flat bottom side has, as a result when turning off the Electric hand tool on a pad a wobble-free stable arrangement can be achieved. If the bottom side of the housing component in the same plane as the surface of the Tool runs, so the electric hand tool on the total floor area of the dust collecting space Housing component are parked. Unless this floor area is set back to the flat tool enable easier machining of a workpiece, so there is an at least transverse linear one Support available, so that the device tilts Side is largely avoided.

To make the housing component even safer with the To connect the machine housing can be provided that the end side of the housing component is designed so that a cable grommet of the power connector connected to the Machine housing is attached and protrudes from it, is encompassed by the housing component. It can Housing component should be designed so that it is in the area its end side to the end grip of the machine housing is connectable and is shaped so that it fits in seamlessly this passes over and so the impression of a uniform Griffes conveyed together with the machine housing.

Since it would be necessary or desirable if necessary, Using an external dust extraction device proves it prove to be particularly advantageous if that Dust collecting housing component detachable and against an external dust extraction device is interchangeable. It is particularly advantageous if the Connection piece on the machine housing is designed so that no adapter is necessary.

Further details and features as well as advantages of Invention result from the appended claims, for the characteristics of which each claim protection by themselves will, and from the graphic representation and following description of a preferred Embodiment of the electric hand tool according to the invention.

Figur 1

eine Seitenansicht eines erfindungsgemaßen Elektroschleifgerates;

Figur 2

ein Gehausebauteil gemäß Figur 1 einzeln in einer Seitenansicht;

Figur 3

die Darstellung gemaß Figur 2, wobei eine Gehausehalfte entfernt wurde;

Figur 4

ein Staubsammelbehälter gemaß Figur 2 von hinten mit entferntem Deckel;

Figur 5

ein Filtermittel von hinten ;

Figur 6

eine Draufsicht auf ein Filtermittel gemaß Figur 5;

Figur 7

ein Längsschnitt durch ein Filtermittel gemaß Figur 6 und

Figur 8

eine Seitenansicht des Deckels.

Show:

Figure 1

a side view of an inventive electric grinder;

Figure 2

a housing component according to Figure 1 individually in a side view;

Figure 3

the representation according to Figure 2, with one half of the housing removed;

Figure 4

a dust collector according to Figure 2 from behind with the lid removed;

Figure 5

a filter medium from behind;

Figure 6

a plan view of a filter means according to Figure 5;

Figure 7

a longitudinal section through a filter means according to Figure 6 and

Figure 8

a side view of the lid.

Figure 1 shows a preferred embodiment of a Electric hand tool according to the invention in the form of a Sanders with a dust pick-up device 2 from one an essentially rigid dust collecting space 4 and detachable on a machine housing 6 of the grinding device attachable housing member 8 is formed.

The sander includes a known and not closer described grinding plate 10 with through openings in not shown way. Through the passage openings dust gets into the inside of the grinding machine Machine housing required. This is done by a appropriate blower device required. The Blower device is designed in a known manner and blows air and thus grinding dust through the openings in the Sanding disc 10 into a dust transport channel. The Dust transport channel opens into an entry opening or a connecting piece with an inlet opening of the Dust collecting space 4 cooperates on its end face 12.

The electric drive is by means of a cable 14 a cable connector 16 connected to the machine housing is given. The cable gland is replaced by a Part 18 of the housing component 8 encompassed. The share of Housing component 18 is designed so that it on the one side with the housing component 8 a harmonious shape forms and on the other hand is designed so that it connects seamlessly to the machine housing 6, so that the housing component 8 together with the machine housing 6 forms an organic form.

The machine housing 6 is so at least in the area 20 trained that it serves as a handle. In the area of Housing 20, which serves as a handle, is also a Actuator 22 for switching the on and off Tool provided. On the grinding plate 10, a suitable sandpaper can be attached.

To run the shown sanders is also a further front handle 24 provided with the second hand can be taken.

Overall, the customized shape of the Housing component 8 to the machine shape of the sander Design very appealing tool can be achieved. About that In addition, the distance 26 between the region 20 and the housing component 8 a protected guide of the Tool can be achieved. If the grip area 20 by a user is gripped by the hand Housing component 8 protected. That way, next to safe and very ergonomic handling be guaranteed.

Figure 2 now shows the extracted Housing component 8. At the front end 12 there is the dust duct connection at the rear end of the Sanders dust duct is attached. The housing component here has air outlet openings 28 which in the Side walls 30 and the top side 32 of the housing component 8 are arranged. Through the air outlet openings 28 the filtered air blown out by the dust is largely exempt.

The bottom side 34 of the housing component is straight trained to at least one linear support at Parking the sander and tipping it backwards to ensure. Lateral tilting of the tool can be prevented.

In addition, the portion 18 of the housing component 8 can well can be seen what is used to grip the cable grommet 16. The housing component 8 consists of two half shells 8a and 8b, which are connected by screw connections 36 are connected.

On the end side 38 of the housing component 8 there is a Cover 40 provided in the direction of arrow 42 pivotable, but fixed to the housing component 8 connected is. The lid is a hinged lid executed, which is rotatably mounted about a hinge. The In this way flap 40 is captive and also permanent a filter change or emptying the Dust collector protected against losing as it does not have to or cannot be removed.

The articulation of the lid is shown in Figure 3.

Figure 3 shows the dust collector according to Figure 2 in a side view, with one half of the housing removed and the cover 40 is shown cut. The Attachment of the cover 40 is carried out with the swivel joint 44 here between the housing halves. A sealing lip 46 points to the inside of the dust collector.

At the lower end 48 of the flap 40 is a locking lug 49 provided with which the flap 40 with the housing component 8th can be locked into place so that the flap is secure closed is. That's in the dust collector Filter means 50 stored, consisting of a rectangular Frame 52 and a pleated filter 54. The filter medium 50 is here in a groove 51 (Figure 4) in the housing halves 8a and 8b performed. The groove 51 also serves as Sealant to the filter medium against the To seal the dust collecting housing. Sealing in the area the flap 40 takes place via the sealing lip 46, which as Part of the circumferential seal is provided. If the Cover flap 40 pivoted in the direction of arrow 42 is, the sealing lip 46 releases the filter medium 50 and this can in the direction of arrow 56 from the Dust collector can be removed by simple Pull out.

In the area of the dust duct connection 13 there is also a O-ring provided, through which a seal of the Housing component 8 takes place opposite the machine housing 6.

Figure 4 now shows the representation according to Figure 2, wherein the rear cover has been removed. It is easy to see that the housing consists of two half shells 8a and 8b, the can be made of plastic as injection molded parts. Here, a pleated filter 54 is used as filter means 50 provided, the folds of which are also shown in FIG are. The back ends of the pleats of the filter are here through a correspondingly shaped plastic cover 58 covered in order to blow out the unfiltered To prevent air.

Figure 5 now shows a filter insert from behind, the Filter frame 52 and the filter cover of the folds 58 too are recognizable. A top view of a corresponding one The filter is shown in FIG. 6, the frame 52 being deliberately rectangular was designed to fit both in terms of to enable one as well as the other direction and thus to prevent incorrect installation of the Filters 50 is possible. In addition to the frame 52, FIG see the cover 58 opposite the pleated filter 54 become.

Finally, FIG. 8 shows a separate illustration of the Lid in a side view with the hinge 44 as well the locking lug 49 at the lower end 48 of the cover 40.

Is now grinding dust in operation through the dust discharge channel conveyed into the dust collector, so penetrated the dust-laden air passes through the filter 50 the air outlet openings 28 from the housing component 8.

As soon as the dust collecting space is filled, it can - without this is removed from the machine - the Dust collection container can be emptied by the cover 40 from its first rest position, in which it has an opening 60 closes on the end side 38 of the housing component 8, in a second rest position is brought.

By opening the lid further it is beyond possible, the filter medium consisting of filter frame 52 and To remove folder filter 54 from the dust collection area and replace if necessary.

Due to the guidance in grooves, which at the same time the sealing serve in the dust collector is a particularly simple Assembly and disassembly of the filter medium 50 achieved. This can be easily manufactured by the Realized using a two-shell plastic housing become.

The lid is captively attached to the housing 8. Through the additional attachment of the dust collection cassette on the grommet 16 of the power cord 14 or at the rear End of the sand house on which the power cord 14 from the If a device is operated, a stable unit results Dust collection cassette and sand house.

Between the portion 18 of the housing component 8 and Machine housing 6 has an O-ring arranged around it Transmission of oscillations and vibrations of the tool to prevent or at least to the housing component dampen.

In particular by emptying or changing the filter without Removal of the housing component 8 will work with one appropriately equipped sander significantly simplified.

Claims (17)

1. Hand-held power tool, in particular grinding tool, plane, router or saw with an extraction device and a dust collection device (2) working in cooperation with the extraction device in which tool the dust collection device (2) is formed by a substantially rigid housing component (8) forming a dust collection chamber (4) attachable to the machine housing (6), in which filter means (50) are receivable, characterised in that the housing component (8) comprises guide means for receiving the filter means and the housing component (8) has an aperture (60) closable by a cover (40) for receiving the filter means (50) and for emptying the dust which has been collected and extracted in the housing component (8), in the assembled position in which the housing component (8) is connected to the machine housing (6) the cover (40) being openable and closable to exchange the filter means (50) and to empty the dust collection chamber (4).
2. Hand-held power tool according to claim 1, characterised in that in its assembled position the housing component (8) is detachably connected to the machine housing (6), in particular is positively latchable therewith.
3. Hand-held power tool according to claim 1 or 2, characterised in that the housing component (8) has a longitudinal extension which in the assembled position coincides with the longitudinal extension of the hand-held power tool and the housing component (8) has a front face (12) oriented toward the hand-held power tool, on which face it can be connected to the extraction device via a connecting pipe, an end face (38) facing away therefrom and two longitudinal faces (30) opposing one another, in addition to a bottom face (34) facing away from the machine housing (6) and a top face (32) facing the machine housing (6).
4. Hand-held power tool according to one or more of the preceding claims, characterised in that the aperture (60) is arranged on the end face (38).
5. Hand-held power tool according to one or more of the preceding claims, characterised in that in the assembled position a spacing (26) remains at least partially between the machine housing (6) and the top face (32) and the machine housing (6) is constructed in this region as a grip (20) and the housing component (8) forms a grip protector to shield a user from touching a workpiece or the tool (10).
6. Hand-held power tool according to one or more of the preceding claims, characterised in that the housing component (8) has air outlet apertures (28) which in particular are slit-shaped.
7. Hand-held power tool according to one or more of the preceding claims, characterised in that the air outlet apertures (28) are provided on the bottom (34) and/or top face (32) and the longitudinal faces (30).
8. Hand-held power tool according to one or more of the preceding claims, characterised in that to close the aperture (60) the cover (40) is hingeably fixed to the housing component (8) and in particular is engageable in the open and closed position.
9. Hand-held power tool according to one or several of the preceding claims, characterised in that on the cover (40) a sealing edge (46) is provided which corresponds to a circular sealing edge in the housing component (8) and is inserted therein, the sealing edge in particular being integrated into the guide means.
10. Hand-held power tool according to one or several of the preceding claims, characterised in that the housing component (8) is constructed as a two-shell housing.
11. Hand-held power tool according to one or several of the preceding claims, characterised in that the filter means (50) are a filter insert consisting of a frame (52) and a filter (54) tightly connected therewith and the frame (52) works in cooperation with the guide means.
12. Hand-held power tool according to one or several of the preceding claims, characterised in that the end face (38) of the housing component (8) grips a cable bushing (16) which is attached to the machine housing (6) and protrudes therefrom.
13. Hand-held power tool according to one or several of the preceding claims, characterised in that the housing component (8) is tightly connected to the machine housing (6), in particular in the housing component (8) on the front face (12) or the corresponding face of the machine housing (6) a peripheral seal, in particular an O-ring, is provided against which the other component rests.
14. Hand-held power tool according to one or several of the preceding claims, characterised in that the frame (52) of the filter insert is formed as a rectangle, so that the front and end faces of the filter means (50) are identical in construction.
15. Hand-held power tool according to one or several of the preceding claims, characterised in that the filter (54) is a folded filter, a filter fold closure (58) which can in particular consist of plastics, being fixable in one piece to the frame (52).
16. Hand-held power tool according to one or several of the preceding claims, characterised in that the housing component (8) in the direction of its bottom face (34) does not protrude over the tool.
17. Hand-held power tool according to one or several of the preceding claims, characterised in that when the housing component (8) is removed a dust extraction device is attachable to the connecting pipe of the suction device of the machine housing (6).

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