GB2441224A

GB2441224A - Dust-extracting system

Info

Publication number: GB2441224A
Application number: GB0716377A
Authority: GB
Inventors: Otto Baumann; Thomas Bernhardt; Hardy Schmid; Juergen Bochert
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2006-08-25
Filing date: 2007-08-22
Publication date: 2008-02-27
Anticipated expiration: 2027-08-22
Also published as: DE102006039969B4; DE102006039969A1; GB2441224B; GB0716377D0; CN101130242A; CN101130242B

Abstract

What is proposed is a dust-extracting system, particularly for hand-held machine tools, which has a first dust-extracting attachment (12) for coupling to a suction unit (14), and at least one second dust-extracting attachment (16, 18, 20).

Description

1 2441224 ut-eXtraCtiflg system

Prior art

The starting point of the invention is a ust-extractiflg system in accordance with the.pre_charaCteriSing clause of claim 1.

P dust-extracting system for hammer drills which havea ust-extractiflg attachment for coupling to a suction unit., is already known.

AdvantageS of the invention What is proposed is a t-extractiflg system, particularly for hand-held machine tools, which has a first dust-extracting attachment for coupling to a suction unit, and at least one second dust-extracting attachment, as a result of which convenience for a person operating said dust-extracting system can be increased through the fact that said person can, if need be, replace the first dust-extracting attachment which is in operation, with the second dust-extraCting attachment. In this context, "dust-extracting attachment" is to be understood to mean an attachment which is intended for directly extracting dust, particularly drilling dust, at a place at which said qiut is produced or develops, and which attachment is disposed directly around a tool. Said dust-extracting attachments are preferably intended for applications of different types, for example for simple extraction and/or blowing-out without a tool, etc., and/or for tools of different types, in which case "tools of different types" are to be understood to mean, in particular, tools for different materials, tools for removing material in different ways such as tools for brushing,. grinding, cutting and/or drilling, and/or tools having substantially different diameters, such as, in the main, diameters which differ by a multiple.

It is also proposed that the dust-extracting attachments be intended for operation with different drilling tools, as a result of which it is possible to obtain increased flexibility of the dust-extracting system for different fields of application. "Different drilling tools" are to be understood to mean, in particular, drilling tools which differ in respect of different fields of application and/or different types of drilling tools, such as, for example, a twist drill, a hollow drill bit or other drilling tools which seem appropriate to the person skilled in the art.

At least one of the dust-extracting attachments preferably comprises at least one transparent partial region, as a result of which it is possible for a person operating the dust-extracting system, or a hand-held machine tool comprising a dust-extracting system, to obtain an advantageous view of a tool, in particular a drilling tool, and/or of that region of a workpiece which is to be machined. In this context, "transparent partial region" is to be understood to mean a region which is formed by a clear space and/or, in particular, from a light-permeable material. In this case, said light-permeable material is preferably constituted by a glass material, a plastic material and/or other materials which seem appropriate to the person skilled in the art.

It is also proposed that the dust-extracting system have at least one means which is intended for blowing-clear.the transparent partial region, as a result of which additional ventilation or a blowing-clear function can be produced when the dust-extracting system is in operation. By this means, it is possible to prevent an unwelcome deposition of dust inside the transparent partial region and for an operator to obtain an unhindered view of a drilling tool and/or of a workpiece which is to be machined. Under these circumstances, said means may be constituted by a flow-directing means and/or, in particular, by at least one additional aperture such as, for example, an air inlet aperture.

At least one of the dust-extracting attachments advantageously has at least one protective means by which an extracting region of the dust-extracting attachment can be sealed off towards the outside. Said protective means is preferably disposed on a side of the dust-extracting attachment that faces towards a workpiece, so that unwelcome unevennesSes in said workpiece can also be compensated for. Said protective means is preferably constituted by a rubber-like material, although other materials which seem appropriate to the person skilled in the art are basically also possible.

In a further refinement of the invention, it is proposed that at least one of the dust-extracting attachments have a receiving region, which is intended for receiving hollow drill bits, as a result of which one sphere of use of the dust-extracting system can be advantageously broadened.

Said receiving region for the hollow drill bit is preferably subjected to extraction and dust-free working is thereby made possible when the dust-extracting system is in operation.

It is further proposed that the receiving region have at least two different cross-sectional areas, as a result of which it is possible to obtain a method of dust-sealing, within the dust-extracting attachment, which is simple from the design point of view. A region which has an enlarged cross-sectional area and is intended for receiving drilling teeth belonging to the hollow drill bit and for dust-extracting purposes, preferably faces towards a workpiece which is to be machined, so that it is possible, by means of a smaller cross-sectional area adjoining said region, to achieve advantageous dust-sealing in the direction of a side which faces away from said workpiece, or in the direction of a person operating the hand-held machine tool.

At least one of the dust-extracting attachments advantageously has an induction conduit which is intended for removing dust by suction from a drill hole, as a result of which dust-free working and improved adhesion or fastening of fastening means within said drill hole can be achieved. For this purpose, said induction conduit is preferably constituted by a tube-shaped component, the length of which is greater, by a multiple, than its diameter or the extent of its maximum cross- sectional area.

It is further proposed that the dust-extracting attachment have at Least one movable tegion, as a result of which it is possible to obtain particularly easy and flexible * introduction of said dust-extracting attachment into a drill hole. Under these circumstances, it is advantageously possible to reduce the susceptibility of said dust-extracting attachment to breakage. In this connection, a "movable region" is to be understood to mean a region which is intended to be set at different angles with respect to an axis, in particular the axis of a tool, such as a drilling axis. Said movable region is preferably constituted by an elastic region, in particular an elastic bellows-type region, or by a ball joint, etc. The dust-extracting system preferably comprises at least one changeable supporting means, as a result of which a workpiece, or a wall which is to be machined, can be protected against dirt and/or pressure points caused by a hand-held machine tool. Said changeable supporting means preferably has a shape which masks all those regions of the dust-extracting attachment and/or ust-extraCtiflg system which come to bear against a wall, it being possible for said changeable supporting means to be, in this case, pushed, bonded and fastened by means of a velcro-type fastener, etc. onto the dust-extracting attachment. In addition, the changeable supporting means may be formed from paper, such as a disposable paper collar for example, from fabric, from rubber and/or from other materials which seem appropriate to the person skilled in the art.

It is also proposed that the dust-extracting system have an interface which is disposed in a partial region of an extracting conduit belonging to the suction unit, which partial region is oriented perpendicularly to an axis of extraction, as a result of which it is advantageously possible to vary the length of a movable extracting arm belonging to said suction unit, independently of said interface or independently of the different dust-extracting attachments. Basically, however, it is also possible to dispose the interface along the axis of extraction to the suction unit and/or in some other position on the dust-extracting system which seems appropriate to the person skilled in the art. One plane of the interface is preferably adapted to a very large insertable tool. In this case, an "axis of induction" is to be understood to mean an axis along which the dust-extracting system is substantially oriented and which may, in addition, extend parallel to an axis of the hand-held machine tool, such as, in particular, a drilling axis.

The dust-extracting system advantageously comprises at least one latching unit in the region of an interface, as a result of which simple and, in particular, tool-less fastening of the dust-extracting attachments to the suction unit can be obtained.

In addition, it is proposed that said latching unit have at least one operating element which is intended for tool-less fitting and/or demounting, as a result of which simple and, in particular, tool-less releasing of the latching connection can be obtained, or the different dust-extracting attachments can be changed on the suction unit in a particularly rapid andsimple manner.

Drawings Other advantages emerge from the following description of the drawings. One exemplified embodiment of the invention is represented in the drawings. Said drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider said features individually and unite them to form other useful combinations.

Fig. 1 shows a diagrammatic representation through a hand-held machine tool with a dust-extracting system; fig. 2 shows a partial section through the dust- extracting system from figure 1, with a dust-extracting attachment for a twist drill; fig. 3 shows a dust-extracting attachment from figure 2; fig. 4 shows a dust-extracting attachment which is open at the top; fig. 5 shows a partial section through the dust- extracting system from figure 1, with a dust-extracting attachment for a hollow drill bit; fig. 6 shows the dust-extracting attachment from figure 5; fig. 7 shows a dust-extracting attachment with an induction conduit; and fig. 8 shows a changeable supporting means.

Description of the exemplified embodiment

Represented in figure 1 is a hand-held machine tool.58 with a rotating and/or percussive drive for a tool such as, in particular, a hammer drill, to which machine tool a dust-extracting system 10 is coupled via a coupling point 60.

Said dust-extracting system 10 comprises a suction unit 14 and a number of dust-extracting attachments 12, 16, 18, 20 (figures 1 to 7) Said dust-extracting attachments 12, 16, 18, 20 are intended for operation with different drilling tools 22, 24 and are coupled, via an interface 46, to an extracting arm 62 belonging to the suction unit 14, which arm is variable in length.

The hand-held. machine tool 58 (figure 1) has a driving unit 64, a fan 66 for cooling said driving unit 64, and an additional fan 68. In the direction of driving 70, the hand-held machine tool 58 has a tool-holding fixture 72 in which a drilling tool 22 constituted by a twist drill is located. An air suction which is necessary for dust--extracting purposes is generated in the dust-extracting system 10 via the additional fan 68 belonging to the hand-held machine tool 58. Said additional fan 68 is driven by a driving unit 64 via a driveshaft 74. When the dust-extracting system 10 or the hand-held machine tool 58 is in operation, an air suction is generated which leads to the extraction of dust at the dust-extracting attachment 12.

Said dust-extracting attachment 12 is disposed around the drilling tool 22 in the peripheral direction 76 and extracts drilling dust and residues which occur in the.

course of the drilling operation. The drilling dust is directed by the dust-extracting attachment 12, via the interface 46, into an extracting conduit 52 in the extracting arm 62, which conduit is variable in length, said extracting arm 62 being oriented along an axis of induction 48. Said axis of induction 48 extends parallel to a drilling axis 78. At an end that faces towards the dust-extracting attachment 12, 18, the extracting conduit 52 comprises an angled piece 80 which has a 90 bend in the direction of the drilling tool 22, so that a partial region 50 of said extracting conduit 52 is oriented perpendicularly to the axis of induction 48 (figures 2 and 5). The interface 46 between the extracting conduit 52 and the dust-extracting attachment 12, 18 (figures 2 and 5) is disposed at the partial region 50 of said extracting conduit 52, a plane 82 of said interface 46 being oriented parallel to the axis of induction 48 of the suction unit 14 and perpendicular to a direction of suction 98 in the partial region 50 of the extracting conduit 52 (figures 1, 2 and 5) The drilling dust sucked in passes, via the extracting conduit52, into a dust-collecting module 84 belonging to the suction unit 14 (in a manner indicated by arrows in figure 1) Said dust-collecting module 84 comprises a removable filter 86 for trapping dust. In the filter 86, air which has been sucked in is separated from the drilling dust and drilling residues, and the cleaned air is directed, via an induction conduit 88 and then via the coupling point 60 in th.e hand-held machine tool 58, to the additional fan 68, where it escapes via ventilating apertures on the hand-held machine tool 58 which are not represented.

Figures 2 and 5 show a partial section, in the region of.

the interface 46, through the hand-held machine tool 58 which is represented in figure 1 and has the dust-extracting system 10. In the region of said interface 46, the dust-extracting attachment 12, 18 is connected, via a latching unit 54, to the suction unit 14 or to the extracting arm 62. On the dust-extracting attachment 12, 16, 18, 20 (figures 1 to 7), said latching unit 54 comprises a spring element 90 with a button-shaped operating element 56 disposed thereon and, on the extracting arm 62, a clearance 92 into which the spring element 90, together with the operating element 56 constituted by a push-button, latches. The partial region 50 of the extracting conduit 52 has a rectangular cross-sectional area in the region of the interface 46. A cross-sectional area in the region of the interface 46 of the dust-extracting attachment 12, 16, 18, 20 is adapted to the cross-sectional, area of the partial region 50, so that said dust-extracting attachment 12, 16, 18, 20 can be introduced into said partial region 50 in a form-locking manner.

The spring element 90 with the operating element 56 is disposed on a partial region 94 of the dust-extracting attachment 12, 16, 18, 20, which partial region is introduced into the partial region 50 of the extracting conduit 52, so that the spring element 90 is deflected against the spring force on being introduced. If the dust-extracting attachment 12, 16, 18, 20 is introduced into the partial region 50 to the point where the operating element 56 is level with the clearance92, the spring force io causes the spring element 90, or the operating element 56, to latch intO said clearance. For the purpose of releasing the latching connection, the operating element 56 is pressed, by a person operating the dust-extracting system 10, against the spring force until the latching connection is undone and the st-extractiflg attachment 12, 16, 18, 20 can be moved, perpendicularly to the drilling axis 78, within the partial region 50 of the extracting conduit 52. The clearance 92 in said extracting conduit 52 is located on a side of the partial region 50 that faces towards the tool-holding fixture 72 of the hand-held machine tool 58. Said clearance 92 is circular and adapted to a shape on the operating element 56 which latches, when the dust-extracting attachment 12, 16, 18, 20 is in the introduced condition, into said clearance 92 in a form-locking manner. In addition, said dust-extracting attachment 12, 16, 18, 20 comprises, in the partial region 94, a rim 96 which is disposed around the partial region 94, perpendicularly to the direction of suction 98, and prevents the ust-extractiflg attachment 12, 16, 18, 20 from being introduced too far into said partial region 50 (figures 1 to 7) . The dust-extracting attachment 12 from figures 2 and 3 also comprises a circular suction head 100 whose front face 102 is oriented perpendicularly to the drilling axis 78. Said front face 102 faces towards the tool-holding fixture 72 and has, in the centre, a clearance 104 for introducing, the drilling tool 22. Said.clearance 104 is sealed off *by means of an annular-disc-shaped rubber collar 106, so that * it is possible to work. with twist drills of different sizes * 10 in a dust- free manner. The suction head 100 comprises a transparent partial region 26 which is disposed inside a border 128 and at a region located opposite the partial region 94, said border 128 extending, perpendicularly to the front face 102, on a side that faces away from the tool-holding fixture 72. The transparent partial region 26 is made of light-permeable plastic and allows a person using the dust-extracting system 10 an unhindered view (figure 3) of the drilling tool 22 or of a workpiece which is to be machined. Also present, in an edge region 108 of the transparent partial region 26 in relation to the front face 102, is a means 30 which is constituted by an additional air inlet aperture and offers a blowing- clear function while the dust-extracting system 10 is in operation. The means 30 constituted by the additional air inlet aperture generates, between the transparent partial region 26 and a workpiece which is to be machined, an air suction which prevents the deposition of dust on said transparent partial region 26.

On a side that faces away from the tool-holding fixture 72, the suction head 100 has a protective means 32 which is constituted by an annular rubber seal. The suction head 100 also comprises an edge 112 which extends, at an edge region 110 of the border 128, radially outwards in an annular manner around said suction head 100. On one side, which faces away from the tool-holding fixture 72, the edge 112 has an aperture 114 via which the dust-extracting system 10 sucks in, when in operation, the air necessary for dust-extracting purposes.

Represented in figure 4 is another dust-extracting attachment 16 belonging to the dust-extracting system 10, which attachment differs from the dust-extracting attachment 12 from figures 1 to 3 through the fact that a transparent partial region 28 of the suction head 100 is constituted by a suction head 100 which is open at the top.

Represented. in figure 5 is a partial section through the dust-extracting system 10 which comprises another dust-extracting attachment 18. Said dust-extracting attachment 18 is intended for dust-extracting purposes when drilling with a drilling tool 24 which is constituted by a hollow drill bit. For this purpose, said dust-extracting attachment 18 has a receiving region 34 which is intended for receiving said hollow drill bit. The receiving region 34 has two different cross-sectional areas 36, 38, a partial region 116 that faces towards the tool-holding fixture 72 having a smaller cross-sectional area 36 than a partial region 118 that faces away from said tool-holding fixture 72. The partial region 118 having the larger cross-sectional area 38 is intended for receiving drilling teeth belonging to the hollow drill bit, of which teeth no further details are represented, and is subjected to * extraction via an extracting aperture 120. The partial region 116 having the smaller cross-sectional area 36 is almost sealed off, as a result of receiving the hollow drill bit, from the partial region 118 having the larger cross-sectional area 38, so that dust-free working is made possible for a person operating the dust-extracting system 10. In a further refinement of the invention, it is also possible, for the purpose of sealing off the receiving region 34 of the dust-extracting attachment 18, to use a rubber seal and/or other sealing-off arrangements that seem appropriate to the person skilled in the art, between the two partial regions 116, 118. In addition, the suction head 100 also has two supporting elements 124, 126. Said supporting elements 124, 126 have the shape of a quarter-circle and are disposed on the partial region 116. In addition, said supporting elements 124, 126 are oriented parallel to the drilling axis 78 and parallel to a direction of suction 98 of the partial region 50 of the extracting conduit 52. Said supporting elements 124, 126 support the suction head 100 against weight at the partial region 94 of the dust-extracting attachment 18 or at the partial region 50 of the extracting conduit 52.

Figure 7 shows another dust-extracting attachment 20 which is intended for removing dust by suction from a drill hole.

For this purpose, said dust-extracting attachment 20 has a tubular induction conduit 40 which extends in a direction that faces away from the tool-holding fixture 72, one component of the extent of said induction conduit 40 being oriented along the drilling axis 78. In the region of the suction head 100, the dust-extracting attachment 20 has a movable region 42 which is constituted by an elastic bellows-type region. Said elastic bellows-type region is moulded onto the suction head 100 and induction conduit 40 respectively, in a multi-component injection- moulding process, in particular a two-componeni. injection-moulding process. As a result of the movable region, the induction conduit 40 is oriented by a person operating the dust-extracting system 10 at different angles to the drilling axis during operation, so that introduction of *the tubular induction conduit 40 into a drill hole is facilitated, or dust can be removed by suction, with little effort, from drill holes having different angles with repect to the surface of a workpiece.

Represented in figure 8 is a changeable supporting means 44 for the dust-extracting system 10, which supporting means is intended to protect the wall against being marked by the hand-held machine tool 58 and/or the dust-extracting system 10. One form of the supporting means 44 is selected in such a way that all the regions of said dust-extracting system 10 which come to bear against the wall are advantageously masked. The supporting means 44, which is constituted by a disposable paper collar, is fastened to a side of the dust-extracting system 10 that faces away from the tool-holding fixture 72. For this purpose, the supporting means 44 has a self-adhesive face by means of which said supporting means 44 is stuck to the dust-extracting system 10.

Claims

--v-.--Claims 1. Dust-extracting system, particularly for hand-held

machine tools, which has a first dust-extracting * attachment (12) for coupling to a suction unit (14) and at least one second dust-extracting attachment (16, 18, 20)
2. Dust-extracting system according to claim 1, characterised in that the dust-extracting attachments (12, 16, 18) are intended for operation with different drilling tools (22, 24)
3. Dust-extracting system according to one of the preceding claims, characterised in that at least one of the dust-extracting attachments (12, 16) preferably comprises at least one transparent partial region (26, 28)
4. Dust-extracting system according to claim 3, characterised by at least one means (30) which is intended for blowing-clear the transparent partial region (26)
5. Dust-extracting system according to one of the preceding claims, characterised in that at least one of the dust-extracting attachments (16, 18) has at least one protective means (32)
6. Dust-extracting system according to one of the preceding claims, characterised in that at least one of the dust-extracting attachments (18) has a receiving region. (34.) which is intended for receiving hollow drill bits.

7. Dust-extracting system at least according to claim 6, characterjsed in that the receiving region (34) has at least two different cross-sectional areas (36, 38) 8. Dust-extracting system according to one of the preceding claims, characterjsed in that at least one of the dust-extracting attachments (20) has an induction conduit (40) which is intended for removing dust by suction from a drill hole.

9. Dust-extracting system according to claim 8, characterised in that the dust-extracting attachment (20) has at least one movable region (42) 10. Dust-extracting system according to one of the preceding claims, characterised by at least one changeable Supporting means (44) . 11. Dust-extracting system according to one of the preceding claims, characterised by an interface (46) which is disposed in a partial region (50) of an extracting conduit (52) belonging to the suction unit (14), which partial region is oriented perpendicularly to an axis of induction (48) 1.2.. Dust-extracting system according to one of the preceding claims, characterised by at least one latching unit (54) in the region of an interface (46) 13. Dust-extracting system according to claim 12, characterised in that the latching unit (54) has at least one operating element (56) which is intended for tool-less fitting and/or demounting.

14. Dust-extracting attachment, particularly for a dust-extracting system according to one of the,preceding claims, characterised by a receiving region (34) which is intended for receiving hollow drill bits.

15. Dust-extracting attachment, particularly for a dust-extracting system according to one of claims 1 to 13, characterised by an induction conduit (40) which is intended for removing dust by suction from a drill hole.

16. A dust-extracting system substantially as herein described with reference to the accompanying drawings.