DRILLING SUPPORT DEVICE

Description

[0001] The present invention relates to a device or a system for facilitating the freehand drilling of holes, in particular holes in house walls and ceilings, and for extending the service life of drill bits used for this purpose, even in hard wall materials such as concrete or tiles.

[0002] During virtually all renovation work in apartments and houses, as well as during first-time occupancy, holes are drilled into furniture components such as boards, walls and / or ceilings, and floors (hereinafter, furniture components, ceilings, and floors are also included when only "walls" or "room walls" are referred to) to permanently install shelves, cabinets, fixtures, heaters, towel racks, lamps, cables, and the like. Very often, such drilling is necessary after all renovation work, such as painting or tiling, has been completed to fully furnish the rooms.

[0003] The following problems, which can be solved by the invention, can arise during these drilling operations: High-quality tiles in particular are made of very hard material, for example ceramic or hard rock such as granite. Concrete walls are also difficult for drills to penetrate. If drilling is necessary in such material, diamond drill bits are conventionally used, either as twist drills or core drills. However, these drill bits are expensive and become blunt very quickly, especially if they are not cooled and therefore burn out. This problem has previously been countered by frequently withdrawing the drill bit and immersing it in a cooling medium (e.g. water), by complex devices on the hand drill to deliver a cooling medium onto the drill bit or into the drill hole, or by intermittently spraying a cooling medium onto the drill bit during drilling, for example by an assistant using a spray bottle.

[0004] If you drill into a wall using the conventional method (a room wall or another object whose surface should remain as clean as possible, such as a piece of furniture or the like), drilling dust will inevitably be created, which - especially in a newly renovated room where the wall paint may not have fully set or the grout between tiles may not have fully set - requires time-consuming cleanup work and can also be harmful to your health. This difficulty is often at least partially addressed by extraction devices, which are either attached to the drill or held near or under the hole by an assistant. However, these devices are expensive and time-consuming (due to the use of another worker), and they do not completely remove the drilling dust.Finally, such devices cannot be easily combined with the cooling system described above, as they also suck out the coolant and potentially transport it to undesirable locations. Finally, suction devices themselves can be damaged or heavily contaminated over time by the coolant or a sludge composed of coolant and drilling dust.

[0005] Various devices are known in the prior art that offer solutions for cooling and / or removing dust.

[0006] DE 20 2009 004 053 U1 discloses a heat sink for a pillar drill with a guide unit and a main body with a sponge. The guide unit rests on the main body. The main body is attached to the workpiece to be machined, for example, a metal part, via a suction cup arranged on the side. A guide sleeve is provided in the main body, and underneath it is a sponge filled with coolant and with a hole for the drill bit in the center.

[0007] DE 60 2004 003 748 T2 teaches a hand-operated drilling device with a hollow drill (with a diamond head or similar) and integrated cooling. According to the teachings of this document, a pocket containing coolant is inserted into the actual, specially shaped hollow drill. A longitudinally movable drill holder is provided behind the pocket. When pressure is applied to the drill tip, this redirects part of the pressure to the pocket, causing it to tear open. The coolant contained therein is thus forced toward the drill tip, where it exits the hollow drill.

[0008] DE 33 06 563 A1 discloses a drilling aid for dust-free drilling of straight, precisely depth-accurate holes in walls and for connecting boards with studs. A plate with a neck extending at a right angle to it, into which a drill can be inserted, has a cover with a foam rubber coating on its underside (the side facing away from the drill). The drill is doubly guided by a bushing in the plate and by the neck on the drill. The neck is in two parts, so that its upper part can be axially displaced relative to the lower part during drilling.

[0009] The device according to DE 20 2009 004 053 U1 is explicitly designed for pillar drills and requires a comparatively large, smooth surface next to the actual hole for the suction cup holder, as is typical in metalworking. Furthermore, the drill bit is guided by the drill stand. Therefore, the corresponding teaching is not transferable to freehand drilling in walls with relatively rough surfaces. The last two devices mentioned, on the other hand, may be intended for drilling in walls, but they require relatively complex structures to be attached to the drill. These obscure the view of the drill hole, making it difficult to precisely target the desired drilling point. They also increase the weight of the drill. Both of these are disadvantageous from an ergonomic point of view.

[0010] GB 2 435 438 A, which discloses a drilling support device according to the preambles of claims 1 and 5, proposes a type of "dust collector" 14 attached to a drill guide 12 glued to the wall. However, GB 2 435 438 A does not address the cooling of a drill bit.

[0011] DE 2 064 813 U1 shows a sleeve as a dust collection container, which the driller presses against a wall with one hand and pierces with the drill in the other hand. Cooling is not mentioned. Conversely, US 2 847 880 A discloses a sleeve filled with a waxy coolant, which is pierced by the drill. The rotation of the drill is intended to melt the coolant and thus cool the drill. While the description does not clarify how the sleeve is supposed to prevent rotation with the drill, the sleeve could, for example, be held by hand.

[0012] EP 0 894 560 A1 discloses a drilling aid, similar to that known from GB 2 313 563 A, consisting of a pierceable, cylindrical material that is glued to the future drill hole and then drilled through. According to GB 2 313 563 A, the drilling aid is said to have a type of grain in the center to prevent the drill bit from wandering. The drilling aid is intended to guide the drill after it has been drilled through and prevent splintering of the drilled surface. Cooling is not mentioned in these documents.

[0013] US 2012 / 0 288 339 A1 deals with collecting drilling dust at the drill hole. For this purpose, a drilling pad is glued to the drill hole, and rag-like inserts in the drilling pad are intended to wipe the drilling dust off the drill bit during drilling. Again, nothing is said about cooling the drill bit.

[0014] DE 10 2009 054 779 A1 discloses a drill guide with a sponge or similar collecting device that collects coolant supplied from the outside to a drilling location, as well as any drilling dust contained therein. Since this document, in contrast to GB 2 435 438 A, at least mentions cooling, even if it is implemented differently than in the invention, it is considered the closest prior art, against which claim 1 is defined.

[0015] The object of the invention is therefore to create a drilling support device for drilling into walls that can achieve sufficient cooling of the drill bit and prevent the release of dust from the borehole. This should neither increase the weight of the drill that the user has to bear during drilling nor hinder visual control of the drilling process. Furthermore, it is naturally desirable to achieve these goals as cost-effectively as possible.

[0016] This object is achieved by a device according to claim 1 or claim 5. Advantageous further developments are the subject of the subclaims.

[0017] A device according to the invention comprises a centering sleeve and a first wall provided at an angle to the centering sleeve at its axial end. An adhesive, in particular an adhesive, is applied to the first wall. On a flat surface, a suction cup can also be used as the "adhesive"; however, this must have an inner sealing lip around the centering sleeve to create a vacuum without impairing the function of the centering sleeve.

[0018] Thanks to the adhesive, the first wall of the drilling support device can be easily attached to the wall into which drilling is to be carried out. The centering sleeve ensures that the marked center of the hole to be drilled is always visible during positioning (gluing). The adhesive is selected so that it can be removed from the wall to be drilled through without leaving any residue. Once the drilling support device is attached, the drill is safely guided to the spot to be drilled by the centering sleeve. A small amount of the drilling dust created during drilling is absorbed by the adhesive and most of it is guided away from the wall to the rear through the centering sleeve, thus largely preventing soiling of the wall. A suction device attached behind the centering sleeve can collect the dust at a sufficient distance from the wall during dry drilling.If the centering sleeve is perpendicular to the first wall and thus to the room wall, which is parallel to the first wall after installation, a straight hole can be drilled. However, for cases where holes that are not perpendicular to the wall are required, a drilling support device can be manufactured that predetermines the desired angle between the first wall and the centering sleeve.

[0019] According to the invention, the drilling support device according to claim 1 further comprises at least one second wall which adjoins the first wall and, together with the first wall, forms a cavity around at least part of the centering sleeve, wherein the cavity is filled with a coolant / lubricant (hereinafter: coolant). After marking the bore and gluing the drilling support device with visual inspection through the centering sleeve, the drill is positioned such that it opens the second wall and passes through the coolant before penetrating the centering sleeve and subsequently commencing the actual drilling. This ensures that this coolant can penetrate to the drill during drilling.

[0020] Openings can be provided on the side of the centering sleeve through which the coolant can enter the centering sleeve and drilling dust can escape into the coolant between the first and second walls. Alternatively, a separating film or the like between the centering sleeve and the cavity can be punctured when the drill penetrates the centering sleeve. This, together with the vibrations caused by drilling, causes the coolant to penetrate the drill. Furthermore, with this design, the drilling dust is absorbed into the coolant and can therefore no longer contaminate the surrounding area.

[0021] Furthermore, the second wall and / or the centering sleeve can preferably have a closure or a valve that can be penetrated by the drill, but also maintains a certain sealing effect after penetration. This ensures that the coolant and drilling dust remain in the drilling support device and do not contaminate the surrounding area.

[0022] At least this closure, but ideally the entire drilling support device or at least a significant portion of it, is preferably made of transparent material. If only the part of the drilling support device above the centering sleeve and any closure of the drilling support device below the centering sleeve is transparent, you can still visually check that the drilling support device is correctly positioned relative to the marked drilling point when it is being applied to the wall to be drilled. If the entire drilling support device (or at least other parts of it) are transparent, you can also visually determine the absorption of drilling dust into the drilling support device and the degree of contamination of the coolant during drilling. If the coolant is only slightly contaminated, you can even visually check the depth of penetration of the drill into the wall.However, due to the compactness of the device according to the invention, this penetration depth of the drill can be controlled more reliably with a conventional stop attached to the drilling machine.

[0023] In this embodiment, the coolant is preferably gel-like. The coolant can be absorbed by a sponge-like structure arranged between the first and second walls. Such a structure prevents the coolant from escaping to the outside, particularly through the second wall, while the drill bit is sufficiently wetted by contact with the sponge and its compression during drilling, and drilling dust is effectively absorbed.

[0024] The device according to the invention can further preferably have a centering marking. This marking can either be visible directly on the bore through the aforementioned closure (for example, applied to a transparent closure above or below the centering sleeve) or can be marked on the outer sides of the first wall, for example, by projections that are opposite each other across the center of the drilling support device. Due to the greater spacing of the markings on the outer sides, even more precise placement of the device on the wall to be drilled is possible with appropriate marking.

[0025] Further preferably, the closure is designed in the manner of a one-way or double valve. Such a valve allows the drill to penetrate the hole, but prevents the coolant from flowing out. Ideas for simple and cost-effective comparable closures that are easily transferable to the present application can be found on bottles used to store and dispense viscous fluids such as honey, ketchup, and the like.

[0026] The drilling support device is preferably designed as a disposable item, for example, as an injection-molded part or as a combination of injection molding with another method for introducing the coolant, since each drilling operation generates dust that contaminates the adhesive and / or the coolant. This allows a new drilling support device to be easily used for each drilling operation, while the used one is disposed of along with the drilling dust adhering to and contained within it.

[0027] The present invention comprises, as a further embodiment, a drilling support device according to claim 5. Such a construction can have the same advantages with regard to cooling and drilling dust absorption as discussed above for a device with an integrated second wall and a coolant provided between the two walls. In addition, when divided into pad and drilling support device, a more flexible material selection for the two separate parts can be made, which can simplify production. Finally, it is possible to design only the pad and possibly the adhesive, for example a double-sided adhesive tape or a weakly adhesive adhesive (e.g. spray adhesive), as disposable items that can be applied to a permanently usable centering sleeve for each bore.This has the additional advantage that a single pad type can be used for different drill diameters and / or drill angles, thus reducing pad production costs through mass production of higher quantities. At the same time, the centering sleeves can be manufactured more elaborately for reuse without increasing the overall cost of the system used.

[0028] According to the invention, the pad is attached to the drilling support device in a dust-tight manner. Various methods are conceivable for this; for example, the pad can be glued to the edge of the drilling support device, or a circumferential projection can be provided on the drilling support device, over which the pad grips, for example with an elastic band, to enclose the device. The centering sleeve can have projections that pierce the pad when applied to the drilling support device. This allows the coolant to be guided into the centering sleeve before the drill bit pierces the pad, so that when the drill bit completely pierces the pad, the majority of the coolant is already pressed into the centering sleeve.Of course, the pad can also have the features mentioned above with reference to a drilling support device directly supplied with coolant, such as (partial or complete) transparency, centering markings, or pierceable closures, particularly with a valve function. Furthermore, the pad can have the sponge-like structure discussed above inside, which absorbs the coolant (and, during use, the drilling dust).

[0029] As tests have shown, the use of the drilling support device according to the invention reduced the time required to drill twelve 6 mm diameter holes in hard tiles (a typical number for a bathroom renovation) from two hours (in the comparative example, the drill was regularly withdrawn and immersed in a cooling medium for cooling) to twenty minutes, i.e., one-sixth of the original time. This primarily eliminated preparatory work such as attaching a centering device and follow-up work such as removing drilling dust. At the same time, the service life of the drill bits tripled due to the improved cooling during drilling, resulting in further significant cost savings (the cost of a diamond-coated hollow drill used for the test was €60 at the time of registration).

[0030] The invention will now be described using an embodiment with reference to the accompanying figures. In the figures: Fig. 1 a drilling support device according to the invention according to a first embodiment on a wall to be drilled through, Fig. 2 a pad intended to be attachable to the drilling support device according to the second embodiment, Fig. 3 a drilling support device according to a second embodiment, Fig. 4 the drilling support device according to Fig. 3 with the attached pad Fig. 2 , and Fig. 5 a detail of the closure of the drilling support device, which has a valve function.

[0031] Fig. 1 shows a section through a drilling support device 1 according to the invention according to a first embodiment. The drilling support device 1 comprises a first wall 10, a centering sleeve 20, and an adhesive (an adhesive layer) 15 applied to the first wall 10 as an adhesive.

[0032] During storage, i.e., before use of the drilling support device 1, the adhesive 15 is covered in a conventional manner, for example by a film (not shown here). Alternatively, the adhesive 15 is applied shortly before use of the drilling support device, for example as a spray adhesive. The adhesive used is one that can be easily removed without residue, particularly from the surface to be drilled, for example an adhesive based on synthetic elastomers such as SprayMount from 3M or based on natural rubber such as Fixogum from Marabu. Alternatively, an adhesive pad 15 or 15a (cf. Fign. 1 , 3and 4 ) may already be firmly connected to the first wall 10, the side of which facing a room wall 50 has comparable properties to the adhesives mentioned above and which, due to its thickness, can also compensate for small unevenness of the room wall 50.

[0033] A centering sleeve 20 of the drilling support device 1 is provided at an angle, in particular at a right angle, to the first wall 10 and one of its axial ends is flush with the first wall 10. The centering sleeve 20 is made, for example, from a plastic and has an inner diameter d matching the diameter of the drill to be used. More precisely, the inner diameter of the sleeve is adapted to the drill so that the drill can be guided in the sleeve, i.e., there is a slight clearance fit. The drilling support device 1 further comprises a second wall 11, which adjoins the first wall and forms a cavity 30 with it. The second wall 11 is shown dome-shaped here; of course, it can also have other shapes, such as the shape of a hollow cylinder, provided that it forms the cavity 30 with the first wall 10.In addition, the wall 11 is preferably at least partially elastic, so that after the drill has pierced the wall 11 (as described later), it rests against the drill. The walls 10 and 11 can be made of the same material, for example, silicone, or of different materials. The cavity 30 is filled with a coolant (not shown), for example, a water-containing gel. In the present embodiment, the centering sleeve 20 does not extend as far as the second wall 11 on the side facing away from the first wall 10, so that the gel also fills an interior space 21 of the centering sleeve 20. In addition, the centering sleeve 20 has at least one opening 22, usually several openings 22, through which its interior space 21 is connected to the cavity 30 outside the centering sleeve 20. Both the coolant and the walls 10 and 11, as well as the adhesive 15, are transparent according to this embodiment.In addition, in the example shown here, no adhesive 15 is provided between the centering sleeve 20 and the room wall 50 in order to ensure visibility of the point on the room wall 50 to be drilled.

[0034] According to the invention, the drilling support device 1 is attached (i.e. glued to the wall 50) after marking a hole to be drilled in a room wall 50, so that the marking and later the drilled hole are located centrally in the centering sleeve 20. If the essential parts of the drilling support device 1 according to this embodiment (at least in a viewing direction not shown in Fig. 1 from above onto the wall 50) are transparent, the user has a clear view of the marked mark on the room wall 50 at all times when attaching the drilling support device 1.

[0035] After attaching the drilling support device 1 to the room wall 50, the user pierces the second wall 11 of the drilling support device with the drill bit (not shown) of a hand drill (not shown) and inserts it through the centering sleeve 20 onto the room wall 50 to be drilled through. After piercing the second wall 11, the drill bit immerses itself in the coolant. Due to the elasticity of the second wall 11 described above, it conforms to the drill shaft, so that no or very little coolant escapes.

[0036] The drill bit then rotates in the coolant and is received and guided in the centering sleeve 20. It then penetrates, cooled and guided, through the wall 10 into the wall 50 to be drilled. More precisely, the drill shank and the side cutting edges of the drill bit, and initially also the drill tip during the initial drilling process, rotate in the centering sleeve 20 in the coolant. The drilling dust discharged from the hole via the drill bit is primarily absorbed in the coolant. A smaller portion of the drilling dust may adhere to the adhesive 15 directly around the hole. At the same time, the rotation of the drill bit swirls the coolant in the drilling support device 1, causing it to circulate around the drill bit, increasing the cooling effect. Furthermore, the drilling dust discharged from the hole is removed and remains in the coolant.As an alternative to the completely straight structure of the centering sleeve 20 shown here, it would be possible to use a frustoconical inlet of the centering sleeve (not shown) to allow the coolant to penetrate to the drill only on the side facing away from the drill hole in the wall 50. Preferably, however, openings 22 (at least one opening 22) are provided in the centering sleeve 20 as shown here. Through these openings 22, coolant and drilling dust can be better supplied to and removed from around the drill than with a centering sleeve 20 without openings. The two openings 22 shown here are of course only examples; it is also possible to provide a different structure for the centering sleeve 20, e.g. a grid-like structure with several openings one above the other or openings arranged in another way that is optimized for the supply and removal of coolant through the sleeve 20 to the drill.

[0037] Once the hole has been drilled to the desired depth, the drill bit is withdrawn from the hole and the centering sleeve as usual. No, or at least very little, drilling dust falls to the floor because the coolant-wetted drill bit binds a smaller portion of the resulting drilling dust, and the majority of the drilling dust is absorbed by the drilling support device or the coolant remaining therein, as explained above. After the drill bit is removed, the drilling support device is pulled off the room wall 50 and discarded.

[0038] The following is based on the Figuren 2 bis 4 a drilling support device according to a second embodiment is described. The device according to the second embodiment differs from the device according to the first embodiment in that it is constructed in three parts, namely an adhesive pad 15a and a (reusable) first wall 10a with a centering sleeve 20a (see Fig. 3 ) and a coolant pad 40 (see Fig. 2 ).

[0039] As already discussed above in the first embodiment and from Fig. 4 As can be seen, the adhesive pad 15a can be attached to the first wall 10a and serves to hold the drilling support device, here consisting of the first wall 10a with centering sleeve 20a and coolant pad 40, to the room wall 50.

[0040] The centering sleeve 20a according to the second embodiment, similar to the centering sleeve 20, has an inner diameter adapted to the diameter of the drill to be used. It also has openings similar to the openings 22. Differences from the centering sleeve 20 according to the first embodiment are that the centering sleeve 20a is made more stable than in the first embodiment, for example, from metal, and that cutting projections (prongs) 20a1 are provided on the centering sleeve, which protrude away from the hole to be drilled.

[0041] The first wall 10a of the drilling support device according to the second embodiment is also more stable (e.g., made of metal) than the first wall 10 according to the first embodiment. Furthermore, in this example, the first wall 10a has a circumferential projection 10b on its side facing away from the room wall 50. Although not shown here, the hole in the centering sleeve 20a continues through the wall 10a. The adhesive pad 15a according to the second embodiment is applied before use of the drilling support device either around the hole to be drilled on the room wall 50 or on the wall 10a (on the side opposite the centering sleeve 20a). The aforementioned hole in the wall 10a is left open.

[0042] The coolant pad 40 has, as can be seen from the sectional drawing of the Fig. 2 As can be seen, two, for example, film-like outer walls or skins 40a, 40b, between which the cavity 30 is formed, into which a coolant is filled. Preferably, the pad 40 is transparent, as mentioned above in the first embodiment, and is made, for example, of a silicone.

[0043] In contrast to the first embodiment, in the second embodiment the coolant pad 40 is attached to the wall 10 in such a way (for example, by means of a rubber band (not shown) pulled over the projection 10b, alternatively glued all around) that a dust-tight connection is created between the first wall 10 and the coolant pad 40. The cutting projections 20a1 then press, as in Fig. 4 shown, either already due to the pressure when pulling / gluing on the coolant pad 40 or at the latest due to the pressure of the drill on the projection 10b when inserting the drill through the pad 40 into the centering sleeve 20a before drilling, exit holes in the coolant pad 40 through which part of the coolant exits into the centering sleeve 20a and its surroundings within the drilling support device 1.

[0044] Fig. 4 shows the drilling support device according to the second embodiment in the state before drilling. Unlike the first embodiment, the coolant in the pad does not fill the entire cavity above the centering sleeve. Nevertheless, when (in the figure) the drill is inserted from above through the upper skin 40a of the coolant pad 40 into the cavity 30 containing the coolant, and then through the lower skin 40b of the coolant pad 40 into the centering sleeve 20a, the drill passing through the coolant is sufficiently cooled. In addition, there is additional space in the cavity between the coolant pad 40 and the centering sleeve 20a to accommodate the drilling dust (and the coolant escaping from the pad 40).

[0045] The drilling support device 1 according to the second embodiment can be used in two ways: Either the coolant pad 40 is pulled over the projection 10b of the first wall 10 before drilling a marked hole and then the entire drilling support device 1 is attached to the room wall 50 by means of the adhesive 15 or the adhesive pad 15a over the marked hole to be drilled, or first only the wall 10 (with projection 10b and centering sleeve 20a) is attached to the room wall to be drilled through and then the coolant pad 40 is attached to the projection 10b.

[0046] The latter method has the advantage that the alignment of the wall 10 with the centering sleeve 20a to the hole to be drilled in the room wall 50 can be achieved without the coolant pad impairing the view, since it is only attached afterwards. This increases the material selection for the coolant pad 40 and the coolant, because the coolant pad 40 does not obstruct the view of the drilled hole when the wall 10 is attached to the room wall 50. Therefore, the coolant pad or the coolant can also be opaque without causing problems, because the alignment of the drilling support device to the drilled hole is already completed before the coolant pad is attached. With an opaque coolant pad 40, a centering mark (not shown here) is expediently provided on the wall 40a in the middle to facilitate secure insertion of the drill into the centering sleeve 20a of the drilling support device 1.The wall 10a with the centering sleeve 20a can also be manufactured more easily, since no cavity 30 (which must be additionally filled with coolant) and no second wall 11 need to be manufactured. The coolant pads 40 can be completely separate from the main part of the drilling support device, consisting of the wall 10a (possibly with the projections 10b as in . Fig. 4 shown) and the centering sleeve 20a (possibly with the cutting projections 20a1). The coolant pads can also be adapted to different drilling substrates (concrete, tiles, masonry, steel, etc.), for example by using different coolants, different volumes, etc. Finally, the smaller volume allows for a more favorable packing size of the frequently replaced coolant pads 40. Therefore, the individual parts of the drilling support device according to the second embodiment can be manufactured more cheaply overall. Furthermore, it is possible to provide a plurality of different walls 10 with different diameters d of the centering sleeves 21 adapted to the respective drill diameters used, and to only replace the adhesive pads 15a and coolant pads 40.These adhesive and coolant pads can be designed to be used for multiple drill diameters, resulting in an increase in production quantities and thus a further reduction in production costs.

[0047] Although the attachment of the coolant pad 40 to the first wall 10a via a rubber band on a projection 10b was explained above, the attachment is not limited to this. For example, the coolant pad 40 can also be adhesively bonded (at its periphery) to the back of the first wall, or another connection method can be used, such as a hook-and-loop fastener or clamping between the first wall and another surface, for example, a hold-down device (not shown) that can be screwed radially outward over the projection 10b or held there magnetically or similarly, which presses the coolant pad 40 at its outer periphery onto the first wall 10 in such a way that the drilling dust and the coolant are retained.

[0048] Another conceivable method for attaching the coolant pad is to first attach a double-sided adhesive pad to the first wall 10a (i.e., facing the room wall), the diameter of which is larger than the diameter of the first wall 10a, thus protruding beyond this wall 10a. If this adhesive pad is then folded over the wall 10a on all sides, the coolant pad 40 can then be adhered to the upward-facing edge of the adhesive pad 15a.

[0049] Regardless of the type of connection between the coolant pad 40 and the first wall 10a, it is only important that a largely dust-tight connection is created during drilling so that no coolant or drilling dust escapes into the area surrounding the borehole.

[0050] In order to facilitate a particularly central piercing of the second wall 11 according to the first embodiment or of the coolant pad 40 according to the second embodiment and the alignment in the centering sleeve, the closure 60 can be provided above the centering sleeve in the first wall 10 or in the coolant pad 40, in addition to or instead of the above-mentioned centering mark (not shown), as a valve that facilitates the penetration of the drill into the coolant. The closure 60 can, for example (in the first embodiment) consist of an opening provided with valve tabs 65 that can be easily pushed away from the outside (from above in the figure), which fold like a hinge around their edges 66 and can be elastically pushed aside by light pressure, similar to drinking bottles or dosing devices, for example for honey or ketchup.In the second embodiment, two such openings with corresponding valve tabs can be arranged one above the other, both of which are pierced by the drill (not shown) when it is pushed into the centering sleeve 20, 20a. If such a valve is present, the cutting projections 20a1 can be omitted. In particular, in a coolant pad 40 according to the second embodiment, a double valve (two openings arranged one above the other) can be provided on the outer skin 40a and a single valve on the inner skin 40b in order to simplify the escape of the coolant on the inside and thus towards the centering sleeve 20a1 and to make it more difficult for the coolant to escape to the outside.

[0051] Since the valve flaps rest against the drill, the valves prevent coolant from escaping from the drilling support device.

[0052] Fig. 5shows a detail of such a closure 60 of the drilling support device 1, which has a valve function. This closure 60 can be combined with any of the aforementioned embodiments, as described above, although this was not shown. In its simplest form, such a closure consists of a cap made of a flexible plastic, in particular silicone, which closes off the drilling support device 1 or the coolant pad 40. If a relatively viscous coolant, for example a cooling gel, is used in the drilling support device 1, the closure can be pre-slotted as indicated here, preferably crosswise or in a pie-like shape, for example with eight or more edge pieces separated from one another and connected to one another at the circumference of the cap. Such a (centered) cross slot indicates to the user the point for starting the drill in its center.In addition, the drill bends the tabs 65 created by the slot inwards at their edges 66 upon penetration, whereby they conform to the drill and largely seal the penetration point, so that hardly any coolant penetrates to the outside. In addition, such a slot can be opened, for example, by pulling a protective sheath from the surfaces 65, which then also encloses the coolant. However, a slot and / or defined edges are not absolutely necessary, since the drill can drill through the relatively soft silicone of the valve in the present embodiment. Alternatively, a circular weakening of the drilling pad can be provided, preferably somewhat smaller than the shaft diameter of the associated drill. If the drill penetrates this circular valve, the elastic material of the sheath can conform to the drill and thereby seal it. In addition, a scoring, i.e.A partial reduction in wall thickness can be provided instead of a slit to achieve the same result. Finally, the "valve" can also be formed by a second material, such as a metal foil, glued to the closure, which closes a corresponding hole and is either removed before use or pierced by the drill.

[0053] In addition to the embodiments shown above, various modifications are possible that also fall within the scope of the present invention. For example, it is possible to provide the drilling support device 1 according to the first embodiment or the coolant pads 40 according to the second embodiment with a sponge-like structure on the inside, which even better prevents excessive coolant leakage.

[0054] Commercially available water-based, oil-based or gel-based coolants for cooling and lubricating drills can be used as coolants.

[0055] The adhesive 15 or adhesive pad 15a should preferably be selected depending on the substrate into which drilling is to be carried out. The adhesive should adhere better to the drilling support device than to the wall, but above all, it should be removable from the wall without leaving any residue.

[0056] As already mentioned, the drilling support device 1 is preferably made at least partially of transparent material. In particular, the drilling support device preferably allows a clear view of the marked hole to be drilled when it is attached and when the drill is positioned. The first wall 10 with the centering sleeve 20 is preferably made of a comparatively rigid, transparent material such as PMMA (Plexiglas) or (in an example of the second embodiment) of metal, while the second wall 11 is made of a flexible material, for example, silicone-based. This second wall 11 can then conform to the drill after penetration, thereby preventing the coolant and drilling dust from escaping.The coolant pads 40 according to the second embodiment are also preferably made of a flexible material which enables a certain seal between the drill and, in particular, the upper outer skin 40a of the coolant pad 40, if the closure 60 explained above is not provided. List of reference symbols

[0057] 1Drilling support device 10, 10aFirst wall 10bCircumferential projection 11Second wall 15Adhesive 15aAdhesive pad 20, 20aCentering sleeve 20a1Cutting projection of the centering sleeve 21Interior of the centering sleeve 22Perforation of the centering sleeve 30Cavity 40Coolant pad 40aUpper skin of the coolant pad 40bLower skin of the coolant pad 42Elastic band (on the coolant pad 40) 50Room wall 60Closure 65Valve flap 66Flap edge (hinge) dInner diameter of the centering sleeve

Claims

1. Drilling support device (1), comprising a centering sleeve (20, 20a) and at least one first wall (10, 10a) provided at an axial end of the centering sleeve at an angle to the centering sleeve (20, 20a), wherein the first wall (10, 10a) has an adhesive (15) on its side facing away from the centering sleeve (20, 20a) for attaching the drilling support device (1) to a room wall (50), further comprising at least one second wall (11), which is adjacent to the first wall (10, 10a) and together with the first wall (10, 10a) forms a cavity (30) around at least a part of the centering sleeve (20, 20a), characterized in that the cavity (30) is filled with a coolant in such a way that the drill passes through the coolant before it penetrates the centering sleeve.

2. Drilling support device (1) according to claim 1, wherein the centering sleeve (20, 20a) has openings (22) between the cavity (30) and the interior (21) of the centering sleeve (20, 20a).

3. Drilling support device (1) according to one of the preceding claims, wherein the second wall (11) and / or the centering sleeve (20, 20a) has a closure (60) on one or both sides that can be pierced by a drill bit.

4. Drilling support device (1) according to one of the preceding claims, wherein at least parts (11, 30) of the device (1) are transparent.

5. Drilling support device (1), comprising a centering sleeve (20a) and at least one first wall (10a) provided at an axial end of the centering sleeve at an angle to the centering sleeve (20a), an adhesive (15, 15a) for fastening the drilling support device (1) to a room wall (50), and characterized by a pad (40) for attachment to the drilling support device (1) on the side of the centering sleeve (20a) on the first wall (10a), wherein the pad (40) comprises two skins (40a, 40b) and a cavity (30) filled with a coolant formed between the two skins, and can be fastened to the first wall (10a) in the region of its circumference in such a way that a dust-tight connection is formed between the first wall (10a) and the pad (40).

6. Drilling support device (1) according to claim 5, wherein the pad (40) is transparent at least in its central region, which, when fixed to the drilling support device (1), lies above the centering sleeve (20, 20a) of the drilling support device (1).

7. Drilling support device (1) according to one of claims 5 or 6, wherein the pad (40) has a centering mark in its center on the side facing away from a room wall (50) when mounted.

8. Drilling support device (1) according to one of claims 5 to 7, wherein the pad (40) has a sponge-like support structure inside which contains the coolant.