EP0435076B1 - Method and installation for production of spacer frames - Google Patents

Abstract

In order to produce a spacer frame (2) containing a drying agent (1) for insulating glass panes, a hollow profile (3), which is initially free of drying agent, is bent several times to form the frame corners, but is left open at the final corner. Subsequently one, or appropriately both frame legs (5 and 7) leading to this open point can be filled with drying agent (1) and the frame (2) then finally closed. The frame leg (5) to be bent to form the final closure is first completely filled with drying agent, subsequently emptied from its still open front end (10) up to or beyond the bending area (12) and then bent over, so that no drying agent can hinder this final bending operation, and then connected by its open front end (10) to the other open frame leg (7). Thus, despite the fact that the frame is filled with drying agent, the bending operations are not hindered by drying agent. Even so, a very simple installation for carrying out this method is possible, because the hollow profile (3) can be removed from the filling device (8) after filling the still open frame legs and can be placed in the bending device; this may be the same bending device (13) which also carried out the previous bending operations. The emptying process up to the final bending area can be achieved with a combined sucking and blowing device, and carried out without the risk of removing too much drying agent (Fig. 5). <IMAGE>

Description

The invention relates to a method for producing a spacer frame for insulating glass panes containing a desiccant according to the preamble of patent claim 1.

Implementation of the aforementioned method with a filling station and with a bending station.

Such a method and an associated device are known from DE-A-37 40 922. After the hollow profile has been bent several times, when filling the frame leg (s) that are still open, the desiccant should be metered in such a way that the frame leg that has to be bent again to close the frame - the connection point should not lie in a corner region, but rather in the course of a frame leg - only partially and below the Bending point is filled. Then this last bend is carried out with the aid of a bending device which grips the frame leg and then the frame is closed by bringing the two still open end faces together. The other part of the frame leg leading to the connection point can also be filled with a metered filling quantity to such an extent that the straight connection piece to be inserted at the connection point can be inserted without any problems.

The previously known method and the corresponding machine enable automated production, which is therefore suitable for large quantities, which can be achieved in multi-shift operation if possible. However, the mechanical effort on the one hand for the exact dosing and on the other hand for the accommodation of the bending device in the area of the dosing and filling device including the supply of straight connectors and their pressing is relatively expensive, so that such a device for performing the automated method for medium and large Smaller manufacturing companies with smaller quantities of frames to be produced are not worthwhile.

It is therefore an object of the invention to provide a method of the type mentioned at the outset, with which the bending of several frame corners - with rectangular frames three - is also advantageously possible without the hollow profile already being filled with desiccant, so that a correspondingly thin-walled and Inexpensive hollow profile can be used, but the machine effort, in particular the metering effort should be reduced.

This object is achieved with the method steps according to the characterizing part of patent claim 1.

If the frame leg still to be bent completely, i.e. a relatively complex metering device can be avoided up to its mouth or open end face. Ultimately, this complete filling can even be monitored by an operator, it would also be harmless if some drying agent would no longer get into the hollow profile due to overfilling.

In order to then free the desiccant from the bending area, a corresponding partial emptying is then carried out, so that the bending itself can be carried out undisturbed. Because of this procedure, the device to be described can be simplified accordingly and thus a cheaper machine can be produced which is worthwhile even in the case of small quantities.

The mechanical outlay becomes particularly inexpensive and low if the curved hollow profile is removed from the filling station after filling the still open frame leg and inserted into a bending station. Although this makes it necessary to handle the workpiece after filling and before bending - as a rule by an operator - this eliminates the need for complex devices that carry out all process steps to be carried out at one and the same place and are therefore coordinated with one another in terms of control technology and space would have to.

The frame leg to be bent can be partially emptied in the bending station - before the bending process.

It is expedient if air or gas is blown in over a partial cross section of the hollow profile and partial air or gas and desiccant are sucked out from the open end face of this frame leg to partially empty the frame leg to be bent.

Compared to the sole suction of desiccant for partial emptying of the mouth area of the frame leg that is still to be bent, this procedure enables a targeted and precise partial emptying to a desired depth, since the air blown in can be sucked out again together with the desiccant and a suction of more desiccant for example by entrained air through the perforations provided in such frame legs. Instead of such an uncontrolled air intake, for example due to the perforations of the frame legs and a correspondingly inaccurate and uncontrollable, possibly too extensive emptying of the frame leg, the air to be extracted is supplied in a seemingly paradoxical manner directly in the suction area, so that it together with the desiccant to be removed Particles can be sucked out again and suction of air through the drying perforations is avoided. This enables a targeted and precise emptying of that section of the hollow profile which should be free of desiccant for the production of the last bend.

The compressed air can be supplied in the interior of the hollow profile approximately at the distance from its open end face which is completely or partially freed from desiccant, and suction can also be drawn off on this end face of the hollow profile. What is evacuated by the suction vacuum is thus simultaneously supplied with compressed air at the desired emptying depth, so that the section in between can be emptied with great certainty and accuracy without unwanted areas lying deeper or further away from the open end face of the hollow profile be freed from desiccant. It can even be largely prevented by blowing compressed air in the interior of the hollow profile that too much desiccant can flow into the emptying area.

A procedure which is expedient for closing the frame can consist overall in that the frame leg (s) to be connected to close the frame is partially or completely undosed, then in the region of their open end faces up to the plug-in area of a straight connector on the one hand or in or over the bending area of the protruding frame legs are emptied on the other hand and that the frame leg no longer to be bent before closing and in particular before the last bending process on the other frame leg - preferably with a straight connector partially protruding from it - is closed. This closing of the frame leg piece no longer to be bent with the straight connection piece has the advantage that the final closing of the frame can then be accomplished relatively simply by pushing the bent region of the other frame leg with its open end face over this straight connection piece and then in this position can be pressed.

The above-mentioned device for carrying out the method according to the invention is characterized in that the filling station and the station for producing the last bend and are arranged spatially separated from one another for closing the frame and that it has an emptying device for emptying a partial region of a frame leg from its open end face. So much desiccant can be removed from the filled frame leg that its last bend is not hindered. Thus, each of these workstations can be configured very simply and inexpensively by machine, while an operator is generally required for the transfer from the filling station to the bending station. However, this is more profitable for smaller quantities than a device which is complex in terms of spatial arrangement and control and in which filling, bending and closing are to take place automatically at one and the same point.

So that it is still possible to work as efficiently as possible, it is expedient if the bending station is located directly adjacent to the filling station and is preferably arranged on the same machine frame. An operator then only needs to move the filled, partially completed frame around and only have to walk relatively short distances.

An embodiment of the device of considerable advantageous importance can be that the emptying device has a suction opening for attachment to the open end face of the frame leg and that in addition to this suction opening connected to a pressure sink, a compressed air supply is provided, the outlet opening of which is spaced to the suction mouth of the suction device and which can be inserted into the front opening of the hollow profile.

When aspirating desiccant, the required air or gas content is supplied by the device itself, so that an uncontrolled sucking in of air, for example through the perforations of the frame legs and thereby an extensive emptying of the frame leg is avoided.

In order to simplify the targeted supply of compressed air or gas for a controlled suction of a certain amount of desiccant, it is expedient if the compressed air supply is designed as a tube, the outer cross section of which is smaller than the inner cross section of the hollow profile. Thus, this compressed air supply can be inserted into the hollow section to be partially emptied, so that the compressed air then takes place in the corresponding desired depth within the hollow section with the appropriate distance from its open end face, i.e. suction from the open end face leads to the space between to empty the open face and the mouth of the tube in a targeted and controlled manner.

A particularly expedient and easy-to-use embodiment results if the compressed air supply protrudes from the suction opening of the suction device and the length of the protrusion compared to the suction opening is almost equal to the length of the area of the hollow profile to be emptied. In such a constructive embodiment, the emptying device can be fastened in front of the bending station and can be delivered with the suction opening and the compressed air tube in alignment with the hollow profile, i.e. it can be part of the manufacturing device, but in this embodiment the emptying device can also be a hand-held device which can be attached to a hollow profile by an operator.

In order to be able to take into account hollow profiles of different cross sections and dimensions and, above all, different frame dimensions, the compressed air supply tube can be extended and / or - can be exchanged for at least one tube with a different length. In this way, the length range that is to be emptied as seen from the open end of a hollow profile can be varied.

If the emptying device is a hand-held device, it can be connected on the one hand to a pressure source and on the other hand to a pressure sink via movable lines, in particular hoses or the like, and preferably have a handle for handling.

It should also be mentioned that the compressed air tube can protrude approximately centrally from the suction opening. Air and desiccant can be sucked off correspondingly uniformly over the larger outer cross section of the hollow profile, the air itself being able to be supplied in a targeted manner centrally inside the hollow profile.

This results in a method and also a device according to the claims with which spacer frames for insulating glass panes, which are said to be at least partially filled with desiccant, can be produced in a very inexpensive manner, the hollow profile from which the frame is bent, can be thin-walled because the bends can be made when there is no desiccant in their area.

However, the process section for partially emptying a bending area near an open end face and the device provided for this purpose can also be used if Profiles filled with desiccant from the outset - possibly with thick-walled webs - should be bent and joined in a last step.

An embodiment of the invention with its essential features and details is described in more detail below with reference to the drawing.

Fig. 1

ein zu einem abstandhaltenden Rahmen zu biegendes Hohlprofil nach Anbringung einer ersten etwa rechtwinkligen Biegung,

Fig. 2

eine der Fig. 1 entsprechende Darstellung und Seitenansicht des Hohlprofiles nach Anbringung einer zweiten Biegung und

Fig. 3

eine Ansicht des Hohlprofiles nach Anbringung einer dritten Biegung und Abtrennung von einem nachfolggenden Hohlprofil-Stück,

Fig. 4

eine Füllvorrichtung und das dreimal gebogene Hohlprofil wähend des Füllens der beiden noch offenen Rahmenschenkel mit Hilfe dieser Füllvorrichtung,

Fig. 5

eine Ansicht einer Vorrichtung zum Teilentleeren des mit einer letzten Biegung zu versehenden Rahmenschenkels und die zur Anbringung dieser Biegung erforderliche Biegestation mit entsprechenden Biegewerkzeugen,

Fig. 6

die der Fig. 5 entsprechende Ansicht nach Durchführung der letzten Biegung und beim Zusammenfügen der dann miteinander fluchtenden offenen Stirnseiten des Hohlprofiles zum Schließen des Rahmens sowie

Fig. 7

in vergrößerter Darstellung die Entleer-Vorrichtung und die Biegestation beim Entfernen von Trockenmittel aus dem Biegebereich der letzten anzubringenden Biegung.

It shows in a schematic representation:

Fig. 1

a hollow profile to be bent into a spacing frame after applying a first approximately rectangular bend,

Fig. 2

1 corresponding representation and side view of the hollow profile after attachment of a second bend and

Fig. 3

a view of the hollow profile after attaching a third bend and separation from a subsequent hollow profile piece,

Fig. 4

a filling device and the three times curved hollow profile during the filling of the two still open frame legs with the help of this filling device,

Fig. 5

2 shows a view of a device for partially emptying the frame leg to be provided with a last bend and the bending station required for applying this bend with corresponding bending tools,

Fig. 6

the view corresponding to FIG. 5 after the last bend has been carried out and when the open end faces which are then aligned with one another are joined together the hollow profile to close the frame as well

Fig. 7

in an enlarged view the emptying device and the bending station when removing desiccant from the bending area of the last bend to be made.

To produce a spacer frame 2 (FIG. 6) for insulating glass panes containing a desiccant 1, an initially empty, i.e. Desiccant-free hollow section 3 several times according to FIGS. 1 to 3, bent and left open in the area of a last corner. The preparation of the first bend according to FIG. 1, the second bend according to FIG. 2 and the third bend according to FIG Sawing off the hollow profile 3 at a distance from the third bend 4, so that the remaining profile piece 5 can be bent again to close the frame, can be done approximately as it is for profiles from DE-OS 32 which are filled with desiccant from the outset 21 986 is known. The bending process itself can, however, take place due to the lack of desiccant inside the hollow profile 3 with a narrower radius of curvature and modified bending tools, since the risk of the hollow profile 3 bursting is reduced or eliminated, especially on its web located outside in the bending area.

At the remaining position of the frame in the manufacturing stage shown in FIG. 3, where the saw 6 can also be seen schematically, at least the frame legs or profile pieces 5 and 7 starting from this open position can now be filled with desiccant 1, as is shown in FIG 4 recognizes. The frame 2 is expediently suspended vertically so that one of its diagonals runs vertically and the two profile pieces 5 and 7 to be filled are directed obliquely downward from their open end face. You can simultaneously use a filling device 8 are connected, which has two filling openings 9 at a distance which corresponds to the distance and spatial assignment of the two open end faces 10 of the profile pieces 5 and 7.

Desiccant 1 can flow into the filling device 8 from a desiccant tank 11. 4 clearly shows that this arrangement and the engagement of the open end faces 10 in the filling device 8 completely fill the frame legs 5 and 7 with desiccant.

In Figures 5 and 7 it is shown that then at least the frame leg 5 to be bent again is emptied or partially emptied from its still open end face 10 to or over the bending region 12 and then bent and with its open end face 10 with that of the first frame leg or profile piece 7 is connected.

The emptying of the frame leg 5 up to its bending area 12 takes place in a combined blowing and suction process to be explained in more detail, i.e. the profile part which projects and has to be bent over in relation to the bending area 12 is simultaneously blown out and sucked empty, without further desiccant 1 being entrained from the area behind the subsequent bend.

It is clear from the comparison of FIGS. 4 and 5 that the curved hollow profile 3 is removed from the filling station and the filling device 8 after filling the still open frame leg 5 and also 7 and inserted into a bending station 13. This may possibly be the same bending station 13 that has already produced the bends according to FIGS. 1 to 3 in a rational manner. In Fig. 5 it becomes clear that the frame leg 5 which is still to be bent is partially emptied in this embodiment before the bending operation is carried out in this bending station 13.

This partial emptying takes place from the open end face 10 of this frame leg 5, in that air 14 or gas is blown in over a partial cross section of the hollow profile 3 according to FIG. 7 and air 14 and desiccant 1 are sucked out over the adjacent partial cross sections. The compressed air 14 is supplied in the interior of the hollow profile 3 approximately at the distance from its open end face 10 which is to be completely or partially freed from desiccant 1. The suction is carried out on the end face 10 of this hollow profile 3. This ensures that only that part of the hollow profile 3 located between the bending area 12 and the end face 10 is actually emptied, while in a pure suction process, under certain circumstances, via the in such a hollow profile 3 for Spacer frame 2 required perforations in an uncontrolled manner air sucked in and too much or too little desiccant could be carried along. For the suction process in this procedure, the air 14 used for suctioning and carrying the desiccant 1 is first supplied in a targeted manner. Since the air supply and suction take place at spaced locations, the area in between can be emptied very precisely and in a controlled manner by desiccant through this combined blowing and suction.

In summary, the frame leg or legs 5 and 7 to be connected to close the frame 2 are undosed - possibly partially or - in the exemplary embodiment completely, which represents the simplest possibility, as shown in FIG. 4, then in the region of their open end faces 10 to over the plug-in area of a straight connector 15 on the one hand and especially emptied into or over the bending area 12 of the protruding frame leg 5, the frame leg 7, which is no longer to be bent, being closed on the other frame leg 5 before the last bending process - preferably with the already mentioned, partially protruding straight connecting piece 15.

The partial emptying of the frame leg 7, which is no longer to be bent, does not necessarily have to be carried out with compressed air and suction, since only relatively little desiccant has to be removed in the region of the straight connector 15, possibly also the plug-in of the straight connector 15 is achieved by compressing the desiccant filling of this frame leg 7 can be and no bending point must be cleared.

The device with which the above-described method can essentially be carried out can be seen above all in FIGS. 4 to 6. It has the filling device 8 already mentioned on the one hand and the big device 13 on the other, which also includes the emptying device 16, which is particularly useful 7 - next to the bending device 13 - is clearly shown.

FIGS. 4 and 5 illustrate that the filling station having the filling device 8 and the station for producing the last bend in the bending region 12 of the hollow profile with the bending device 13 are arranged spatially separated from one another, so that the frame 2 is transferred from it Filling device 8 to the bending device 13, a handling process by an operator or possibly also by an automatic gripping and transport device. Mutual control engineering and constructive consideration of the Filling device 8 with its units on the one hand and the bending device 13 with their units, in particular a guide jaw 13a, a clamping jaw 13b, a bending jaw 13c, a counter-holder 13d and a bending roller 13e, is advantageously not required, so that the mechanical outlay is kept correspondingly low can be.

The bending station can be located directly adjacent to the filling station and possibly arranged on the same machine frame. However, a separate holder is also possible for each of these stations, that is to say the filling device 8 on the one hand and the bending device 13 on the other hand.

The overall device also includes the already mentioned emptying device 16, with which a partial region of the frame leg 5 can be emptied from its open end face 10. In the exemplary embodiment, this emptying device 16 is attached or arranged on the bending station in front of the bending device 13, that is to say in the region of the open end face 10 of the profile piece or frame leg 5 clamped between the guide jaw 13a and the clamping jaw 13b.

This emptying device 16 has a suction opening 17 for attachment to the open end face 10 of the frame leg 5. In addition to this suction opening 17 connected to a pressure sink, not shown, a compressed air supply is provided, the outlet opening 18 of which is at a distance from the suction opening 17 of the suction device and which can be inserted into the front opening of the hollow profile 3. The emptying device 16 can be delivered according to FIGS. 5 to 7 with the suction opening 17 and the compressed air supply and its outlet opening 18 in alignment with the hollow profile 3 or the frame leg 5 in the bending station, but can also be offset laterally during the actual bending process and, according to FIG. 6, are stored on the guide jaw 13a by means of the compressed air supply in a corresponding opening.

The compressed air supply is designed as a tube 19, the outer cross section of which is smaller than the inner cross section of the hollow profile 3, so that it can be inserted into the hollow profile 3 from the open end face 10 according to FIG. 7.

The compressed air tube 19 protrudes from the suction opening 17 of the suction device and the length of its protrusion above the suction opening 17 is almost equal to the length of the region of the hollow profile 3 to be emptied. In FIG. 7 it is indicated that the one flowing out of the outlet opening 18 Compressed air 14 can also detect and blow out a certain surrounding area at a somewhat greater depth of the hollow profile 3, this blow-out process being supported by the suction from the end face 10 and being directed in the desired direction of emptying. The negative pressure is of course greatest in the area of the open end face 10 of the hollow profile 3, that is to say a higher pressure is present in the bending area 12, which can prevent the drying agent which is not to be removed from uncontrolled and unwanted reflow into the area to be emptied.

According to FIG. 7, the compressed air tube 19 protrudes approximately centrally from the suction opening 17, which results in correspondingly favorable flow conditions. The compressed air or suction channels then run parallel to one another in the interior of the emptying device 16. Their cross sections also take into account the different pressure ratios. The Flow directions are indicated by the arrows Pf1 - compressed air supply - and PF2 - desiccant suction.

It should also be mentioned that the compressed air supply tube 19 can be extended or exchanged for a tube 19 of a different length in order to allow adaptation to different dimensions between the bending area 12 and the open end face 10. The device can also be constructed or controlled so that this area to be emptied always has the same length regardless of other dimensions of the frame 2, which is also advantageous with regard to the bending device 13 and the arrangement of the counter-holder 13d.

In a manner not shown in detail, the emptying device 16 can be moved via movable lines, in particular via hoses
or the like can be connected on the one hand to a pressure source and on the other hand to a pressure sink in order to enable the feed movements according to the double arrow Pf3 and also a movement of their tube 19 in the direction of orientation of the hollow profile 3. It may also have a handle for handling, ie it may be a more or less mobile device 16 that an operator can attach and use if necessary. If the compressed air supply on the one hand and the suction pressure on the other hand can be switched on separately from one another, the emptying device 16 can under certain circumstances also be used as a blow gun if desiccant which is accidentally scattered on the device is to be removed.

It should also be mentioned that the emptying device 16 is also used in other applications in which a channel or the like leading into the depth is to be emptied can be because, on the one hand, an overpressure can be created inside such a channel, the outflow of which, together with the material to be removed, is supported from the open side by suction through the suction opening 17, so that a very specific combined suction and blowing can take place .

To produce the spacer frame 2 for insulating glass panes containing a desiccant 1, an initially desiccant-free hollow profile 3 is bent several times to form the frame corners, but is still left open in the area of a last corner. Then one or expediently both frame legs 5 and 7 leading to this open position can be filled with desiccant 1 and then the frame 2 can be finally closed. The frame leg 5 that is to be bent for the final closing is first completely filled with desiccant, then emptied from its still open end face 10 to or beyond the bending area 12 and then bent over, no desiccant now being able to hinder this last bend, and then with its open face 10 connected to the other open frame leg 7. Despite the desiccant filling, the bending processes are carried out by the desiccant. Nevertheless, a very simple device for performing this method is possible because the hollow profile 3 can be removed from the filling device 8 after filling the still open frame legs and inserted into the bending device 13, which can be the same bending device 13 that the made previous bends. Emptying down to the last bending area can be carried out in a targeted manner with a combined suction and blowing device and without the risk of removing too much desiccant.

Claims (15)

1. A method of producing a spacer frame (2) containing a drying agent (1) for insulating glass panes, a hollow section (3) initially free of drying agent being bent several times to form the corners of the frame and being left open in the region of a final corner, after which at the open location one or both of the frame pieces leading to said open location is filled with drying agent (1), is then bent over and has its open face (10) connected to that of the first frame piece (7) and thereby the frame (2) is finally closed, characterized in that the frame piece (5) to be bent for final closure is filled to beyond the bending area (12) and that subsequently part of the drying agent is discharged prior to the bending operation, such partial discharge being effected from the open face (10) of said frame piece (5) and extending to the bending area (12) of said frame piece (5).
2. A method as claimed in claim 1, characterized in that after the still open frame piece (5;7) has been filled, the bent hollow section (3) is removed from the filling station and put into a bending station.
3. A method as claimed in claim 1 or claim 2, characterized in that partial discharge of drying agent from the frame piece (5) to be bent is effected in the bending station (13),prior to the bending operation.
4. A method as claimed in any one of claims 1 to 3, characterized in that for partial discharge of drying agent from the frame piece to be bent, air (14) or gas is blown in from the open face (12) of said frame piece (5) by way of part of the cross-sectional area of the hollow section (3), and air or gas and drying agent (1) are sucked off by way of the adjacent part(s) of the cross-sectional area.
5. A method as claimed in any one of claims 1 to 4, characterized in that the compressed air (14) is supplied inside the hollow section (3) at a distance from its open face (10) approximating that which is to be wholly or partly freed from drying agent (1), and that removal by suction is effected at said face (10) of the hollow section (3).
6. A method as claimed in any one of claims 1 to 5, characterized in that the frame piece(s) (5;7) to be joined for closing the frame (2) are given an unmetered, partial or complete filling, then drying agent in the area of their open faces (10), up to and beyond the coupling area of a straight connecting piece (15) on the one hand and in or beyond the bending area (12) of the projecting frame piece (5) on the other hand, is discharged and that before the last bending operation is carried out on frame piece (5), frame piece (7) no longer to be bent is closed preferably with the use of a straight connecting piece (15) partly proud of the latter.
7. An apparatus for carrying out the method as claimed in any one of the preceding claims, including a filling station and a bending station, characterized in that the filling station and the station for producing the last bend and for closing the frame (2) are arranged so as to be spatially separate and that the apparatus has a discharge device (16) for drying agent in part of the area of a frame piece (5) to be discharged from the open face of said piece.
8. An apparatus as claimed in claim 7, characterized in that the bending station is directly adjacent to the filling station and is preferably disposed on the same machine frame.
9. An apparatus as claimed in claim 7, characterized in that the discharge device (16) has a suction port (17) for being applied to the open face (10) of the frame piece (5) and that, in addition to said suction port (17) connected to a negative pressure source, there is a compressed-air supply provided whose outlet (18) is spaced from the suction port of the suction device and is adapted to be introduced into the end opening of the hollow section (3).
10. An apparatus as claimed in claim 9, characterized in that the compressed-air supply is in the form of a tube ( 19 ) whose outer cross section is smaller than the inner cross section of the hollow section.
11. An apparatus as claimed in claim 9 or claim 10, characterized in that the compressed-air supply projects from the suction port (17) of the suction device and the projecting length relative to the suction port (17) is almost equal to the length of that zone of the hollow section (3) from which drying agent is to be discharged.
12. An apparatus as claimed in claim 10 or claim 11 , characterized in that the compressed-air supply tube (19) is extensible and/or replaceable by at least one tube of different length.
13. An apparatus as claimed in any one of claims 7 to 12, characterized in that the discharge device (16) is fitted at the bending station in front of the bending device (13) and is adapted to be infed with the suction port (17) and compressed-air tube (19) in alignment with the hollow section (3).
14. An apparatus as claimed in claim 7 or claim 9, characterized in that the discharge device (16) is connected via flexible lines, particularly via hoses or the like, to a pressure source on the one hand and to a negative pressure source on the other hand and preferably has a hand-grip for the handling.
15. An apparatus as claimed in any one of claims 10 to 13, characterized in that the compressed-air tube (19) projects approximately centrically from the suction port (17).

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