DE3302164A1 - Drilling auxiliary device - Google Patents

Abstract

The drilling auxiliary device serves for the dustfree production of straight bore holes in walls etc. and for the production of mutually aligned bore holes and edges in the right-angled connection of boards by means of pins. The drilling auxiliary device consists of a rectangular plate 1 with a hollow cylindrical neck 12 which extends upwards at an angle of 90 DEG and into which a likewise hollow cylindrical extension 13 is inserted. A lid 25 provided with a cellular-rubber coating 26 can be pushed onto the underside of the plate 1. With the drilling machine inserted, the drilling machine neck bears against the extension 13, 22 and the drill is guided through a drilling sleeve 3 inset in the plate 1. A container is thus created, from which no drilling dust can escape and straight bore holes are produced by means of the double guiding of the drilling machine. By means of pins 9 which can be inserted into the plate 1, the bore holes can be drilled on all boards with the same distance to the longitudinal and transverse edge, in the case of boards to be connected at right angles. A depth scale arranged on the extension 13 and a fixing ring 21 make possible accurate adjustment of the drilling depth. <IMAGE>

Description

ear aid

The invention relates to a drilling aid for accurate depth and dust-free Making right-angled boreholes in walls, ceilings and floors and for fabrication of deep, straight and aligned drill holes in through pins or corrugated dowels to be joined together at right angles to boards or the like.

Are known different types of devices that a dust-free Allow drilling in walls and ceilings.

All devices have the disadvantage that the surface lying against the wall is rigid, so that gaps can form if the wall surface is uneven the dust can escape. To enable dust-free drilling is with some Devices even need to connect a vacuum cleaner for dust extraction, which is an additional and cumbersome effort.

To achieve exactly right-angled drill holes in walls, there is no Device known. However, this is important because with inclined holes like them easily occur with freehand drilling, the inserted screws no longer have the desired position. To prevent the drill from getting lost when drilling, this must also be placed exactly at right angles to the wall.

For the production of aligned drill holes and board edges when connecting wooden panels or the like at right angles (front side of one board with flat side of the other board) are different types of Drilling jigs known. Some devices have the disadvantage that they don't respond well enough can be fixed to the board, which is why the devices move when drilling. In addition, it is not possible for any device to determine the drilling depth to adjust. But this is particularly important, because if the drilling is too deep, it will be on the surface side board to be drilled is quickly pierced. If, on the other hand, the borehole is not deep enough, so it may be that the pin or corrugated dowel does not have enough grip and breaks out.

The invention is based on the object of providing a drilling aid as described in the introduction Firstly, a dust-free drilling in walls and ceilings ensures that, secondly, the production of exactly right-angled drill holes in walls, ceilings and floors and with the third, which belongs together at right angles When connecting boards at right angles, drill holes are aligned and accurate to the depth can be produced.

The object is achieved according to the invention in that a preferably rectangular plate in the middle a round, vertically extending opening for receiving a has interchangeable drill bushing and different parallel to the longitudinal axis of the plate round, vertically extending through holes are provided, of which only ever two have the same distance to the longitudinal axis of the plate that on the longitudinal axis of the Plate on both sides of the center and at the same distance from it two more round, vertically extending through holes and on both sides of these through holes with the same distance to the transverse axis of the plate further through holes of the same Art are arranged and all these through holes with on the underside of the plate protruding pins can be fitted that the plate is centered and at an angle running from 900 upwards a hollow cylindrical neck on the wall in the The area of the root of the neck has an opening and a hollow cylinder in it shaped extension is introduced with a precise fit and by means of a Bracket is held by two oppositely arranged at the upper edge of the neck Wall openings engages in two grooves running vertically in the extension, which end just above the bottom edge that is between the bottom of the neck and the bottom the extension is a compression spring that the wall of the extension at the bottom The edge is narrowed and sealed against the neck with a circumferential cuff is that the bottom of the extension has an opening in the middle and one in the bottom has a circular groove that the extension is provided with a depth scale on the outside and is surrounded by a locking ring that-on the upper edge of the extension a ring is inserted, which has a circular groove, the outer limit of which corresponds to the outer diameter of the extension and its inner limit extends beyond the inner diameter of the extension that is at the bottom the plate is centered a recess and in this recess one from the edge the central opening outgoing neck extension extends partially that on the Underside of the plate a lid can be inserted, the bottom outside with a flexible foam rubber covering or the like is provided that this cover in the vertical extension of the central opening in the plate and some through holes can also have perforations and two lying on the longitudinal axis, protruding outward on both sides of the lid base Has lugs that are arranged in the underside of the plate in the area of the longitudinal axis There are through holes and recesses and a spacer bar is inserted here can be different round, vertical in extension of the longitudinal axis of the plate has extending through holes -, - whose widths correspond to the widths of the Holes corresponds.

The drill is pushed through the hollow cylindrical extension The attached ring is inserted into the auxiliary drilling device until the drill housing hits the ring and the drill neck fits precisely on the wall of the ring opening is present. During the drilling process, the extension is pushed into the neck until the drilling depth set by means of the locking ring on the extension is reached by the locking ring hitting the top of the neck. After completion After the drilling process, the extension is returned to its starting position by the compression spring pushed back. As those embedded in the wall opposite the extension Grooves end just before the bottom edge, the extension through is made in the grooves engaging clamp tips secured against being pushed out completely.

If the drilling aid is now with the foam rubber-coated side of the Lid is pressed against the wall in such a way that the one located in the area of the base of the neck The opening does not point downwards, this creates a container from which when drilling no drilling dust can escape. Because the foam rubber covering any unevenness in the wall compensates, all the drilling dust gets into the interior of the drilling aid. Of the Most of this drilling dust collects in the cavity between the plate and the lid. The drilling dust that gets into the inside of the neck is separated from that in the ground the extension recessed groove collected, with the circumferential sleeve attached the outer wall of the extension, a leakage of drilling dust between the neck and the extension prevented. However, especially when drilling holes in the ceiling, a small one gets there Part of the drilling dust into the interior of the extension, where it is removed from the in the attached Recessed ring Nut caught. The one in the area of the base of the neck The opening located in the iialswand serves as a vent so that the through the Pushing the device together, compressed air can escape.

Since the drill through the inserted drill bushing and through the attached ring or the sliding of extension and neck double is guided, one achieves an exactly right-angled course of the hole.

From the through holes located along the longitudinal axis of the plate if the pair of holes is fitted with downward protruding pins, the distance between them to the longitudinal axis of the plate corresponds to half the board thickness. If the lid of removed from the underside of the plate, the auxiliary drilling device can now work with the underside of the plate placed on the front wall of the first board and placed the pins on the long edge will. The inserted drill bushing comes to rest exactly above the center of the front wall.

If now one of the arranged on the longitudinal axis of the plate Through holes is provided with a pin, this can be done on the transverse edge of the board. The three-sided contact with the board means that it can be moved the drilling aid practically excluded when drilling. Will the drilling aid on the longitudinal or transverse edge of the second board to be drilled on the surface side created with the same setting, you get drill holes on both boards the same distance from the longitudinal edge to the borehole and from the transverse edge to the borehole which results in flush edges on assembled boards. Should be in the boards If several adjacent holes are drilled, so will the spacer bar from the underside of the plate out in one of the on the longitudinal axis the plate arranged holes inserted. Now the spacer bar is made using a matching pin with the last drilled hole. It turns out like that fixed distance between the drill holes, which also corresponds to the second board can be taken over.

Are the holes on the flat side of the rectangular second Board not along the long edge but further towards the center of the surface run offset at right angles to the transverse edge, so the pins are again removed, the underside of the plate occupied by the lid and those on both sides a through-hole located on the longitudinal axis of the plate equipped with pens. The drilling aid is placed on the board in such a way that the The pins rest on the transverse edge and those on the opposite side on the lid attached nose points to a previously attached marking line. Since the tip of the nose lies exactly on the longitudinal axis of the plate and the pins at right angles to the longitudinal axis are arranged, a drill hole is created which leads exactly through the marking line. the The underside of the lid with a foam rubber coating prevents the drilling aid from moving when drilling. The other holes are made using the spacer bar as described drilled.

Here, too, the drilling depth is set with the aid of the locking ring. Thanks to the double guidance of the drilling machine, straight drill holes are achieved, which is of the utmost clarity for the accuracy of fit.

The replacement of the drill bushing is achieved in that the drill bushing is provided with a collar, which the downward running neck approach of the central Opening of the plate overlaps, with its iials fits exactly into the central opening and is secured by a union nut which has two hook-shaped extensions which led from below through two openings in the ceiling of the slab and be connected to the slab ceiling by turning the union nut.

Another embodiment of the invention solves the replacement of the drill bushing in that the drill bushing is preferably made of plastic Coat is surrounded, the one edge of a fluted or otherwise provided with edges Has collar and at the other edge two opposing pins, the distance of the The tenon to the collar corresponds to the thickness of the slab ceiling, the neck of the mantle in the central opening of the plate fits and two pins corresponding to this opening Recesses are attached.

These configurations of the drill bushing make it easy to replace and to be replaced by a drill bushing provided with a different bore.

Another embodiment of the invention is achieved in that in of the plate instead of the many pairs of through holes along the longitudinal axis A pair of through holes is arranged through which downward protruding pins The one square strip attached to the underside of the plate can be inserted can accommodate, which are now in turn pairs of holes with different distances to the edge of the strip and the distance between the two holes of a pair of holes is the distance between the pair of holes in the plate corresponds.

As a result, the pins are no longer directly used to lay against the Board, but the square bar. Adjusting to the appropriate board thickness is now done by moving the square bar.

Another embodiment of the invention is achieved in that the No hollow cylinder-shaped neck attached to the plate and running at the top firmly connected to the plate but rotatably mounted, the neck at the bottom stood a laterally outward approach with a round, vertically running approach Has a through hole into which a pin can be inserted into an in the plate provided and from the longitudinal axis in a circular arc until it is reached the transverse axis extending breakthrough engages and extends beyond the plate bottom and a second similar opening of the first opening symmetrically opposite.

This makes it possible that the end wall of the board when attaching of the drilling aid encompassed from four sides regardless of the thickness of the board can be turned by turning the neck until the pin is on the second long edge is present.

The auxiliary drilling device preferably consists of plastic injection-molded parts.

In the following, an embodiment of the invention is referred to explained in more detail on the drawings.

Shown are: FIG. 1 along a cross section of the auxiliary drilling device the longitudinal axis and a side view of the union nut figure rotated by 900 Fig. 2 is a side view of the drill jig Figure 3 the drilling aid without Bollr socket and without cover. # placed on the front wall of a board the view from above Figure 4 the auxiliary drilling device without drill bushing and cover from the View from below (plate underside) Figure 5 the lid from the view from above Figure 6 the spacer bar from a side view and from the top view FIG. 7 the Square bar from the top view of Figure 8, the auxiliary drilling device placed on the surface side of a board Figure 9 the drilling aid placed on the front wall of a board, FIG. 10, the plate with the neck in the embodiment with a rotatable Ilals from the top view of FIG. 11, the configuration of the drill bushing embedded in ein'Mantel, seen in cross section and from above The drilling aid consists of a preferably rectangular plate 1, the center of a round, vertical having extending opening 2, which is used for inserting a replaceable drill bushing 3 is provided. Starting from the slab floor is located in the area of the center a recess 24. Starting from the central opening 2, an Ilals approach 38 protrudes partly in this Recess 24 into it. The drill bushing 3 is pushed from the underside of the plate into the precisely fitting central opening 2 up to the Btid attached to the drill bushing 3 hits the neck 38. The federal government overloaded the lial approach 38 so that the drill bushing can be removed more easily. Of the Drill bushing collar is covered by a union nut, the opening of which is at least is as wide as the opening of the drill bushing 3 and the two hook-shaped extensions 30 has, which from below through two openings located in the plate ceiling 39 out and connected by turning the union nut 32 with the plate ceiling will. Another possibility is for a drill bushing 3A to be embedded in a jacket 31 is, which has a fluted collar 33 on one edge and two opposite edges on the other edge Has pin 34. The distance between the pin 34 and the collar 33 corresponds to the strength the slab ceiling. In this embodiment, the central opening 2 must have two recesses; which correspond to the pin 34 are expanded. The part can now with the tenons 34 must be inserted in advance into the central opening 2 and secured by turning.

From the top of the plate extends in the middle at an angle of 900 upwards a hollow cylindrical neck 12, the wall of which is in the area of the root of the neck is broken through by a vent opening 11. In these llals 12 is from above a likewise hollow cylindrical extension 13 is introduced. This extension 13 has two opposite, perpendicular grooves on its outside 18, which end just above the lower edge. The wall of the Ilalses 12 has barely below its upper edge two opposite openings 15. By means of one Bracket 14, the ends of which through the wall openings 15 into the grooves 18 of the extension 13 engage, the extension 13 will prevent it from being pulled out of the neck completely 12 'secured between the slab ceiling and the floor the extension 13 a compression spring 19 is used, which the entanglement 13 again and again in pushes back their starting position.

The bottom of the extension 13 has an opening 41 in the middle and a circumferential groove 16 on the underside.

The wall of the extension 13 is at its lower edge from the outside slightly narrowed so that a circumferential cuff 17 can be applied, which the extension 13 is intended to seal off the neck 12. The extension 13 is further provided with a vertical scale 20, which shows how far the extension 13 is pushed into the neck 12. A locking ring is used to set the drilling depth 21 is provided, which spans the extension 13 and clamped by means of the screw 42 can be. Now the extension 13 can only be pushed so far into the neck 12 until the locking ring 21 hits the edge of the neck.

A ring 22 is placed on the upper edge of the extension 13, whose opening width 43 corresponds to the thickness of the drill neck. The ring 22 is placed on the extension 13 with the aid of a groove 23, the outer limit of which corresponds to the outer diameter of the extension 13 and its inner limit above. the inner diameter of the extension 13 extends so that between the Inside of the extension 13 and the inner boundary of the groove 23 a gap is created.

On the bottom of the plate 1, a cover 25 can be placed, the Side end of the plate 1 partially grip around on four sides. The cover 25 has in the vertical extension of the central opening 2 and various in the plate 1 located through holes 7, 7A, 8, 8A also have openings 45, 46 on. The lid 25 is on the outside of the bottom with a flexible foam rubber covering or the like. On the bottom of the lid are on the longitudinal axis on both sides outwardly protruding lugs 27, 27A attached.

The drill is through the opening 43 in the drilling aid inserted until the housing abuts the ring 22 and the drill neck on the Wall of the ring opening 43 rests. The extension is made by pressing on the drill 13 pushed into the neck 12 until the drill emerges from the underside of the lid. Of the Drill is set on the wall in the intended position and then the drilling aid is used pressed against the wall. The foam rubber-covered cover 25 resembles slight unevenness on the wall.

This creates a closed container that can only be accessed through the vent 11 is broken. The drilling aid is positioned so that this vent opening 11 is not directed downwards. Since the drill is supported by the extension 13 and the drill bush 3 is guided twice, the drill is exactly at right angles to Attached to the wall, which is why it can no longer run so easily and straight drill holes develop.

Most of the dust that emerges when drilling is made up of that between Cover 25 and plate ceiling resulting cavity 24 collected. The one in the interior of the lial Incoming dust is collected through the groove 16 in the bottom of the extension 13 and by means of the cuff 17 at the exit between the neck 12 and the extension 13, what for perfect intermeshing vol! of utmost importance. When drilling on the ceiling it can happen that a last residue of drilling dust also enters the interior the extension 13 arrives. This drilling dust is from the by doing plugged-on groove 23 located for? ii # 22.

The ventilation opening 11 is used to ensure that the pushing together compressed air of the drilling aid can escape. Would be this vent 11 does not exist, the air would create an exit somewhere and exit there under high pressure and with the entrainment of dust.

With the auxiliary drilling device, dust-free paving is also possible if the device is not pressed on by hand, as this function is then controlled by the Spring 19 is taken.

Parallel to the longitudinal axis 5, several round, vertical ones are in the plate 1 extending through hole pairs 4, 4A arranged. This means that there are always two through holes lie on the same side of the longitudinal axis 5 and the same distance from the longitudinal axis 5 have. This distance corresponds to half the thickness of the board 40, which in its end wall is to be provided with drill holes. If the auxiliary drill with the underside of the plate is placed on the end wall of the board 40 that the inserted into the two through holes 4, 4A and protruding from the plate bottom If pins 10 rest on the longitudinal edge of the board, the center of the drilling aid is located exactly in the middle of the board thickness. Since in the plate 1 several pairs of through holes 4, 4A are present at different distances from the longitudinal axis 5, different Board thicknesses are drilled in the middle. Will the auxiliary drill with the same setting attached to the surface side of the other board 44, the drilling takes place in the the same distance to the long edge as on the first board. Should a board 40 are drilled, for the strength of which no through hole pair 4, r4A is provided the pair of through holes 4, 4A that is closest to the board thickness is selected comes. In this case, the drilling is not exactly in the middle of the front wall, however, since the distance to the longitudinal edge is the same as in the case of the second board 44, result holes and edges aligned again.

On the longitudinal axis 5 of the plate 1 are on both sides of the center and at the same distance from it two further round, vertically extending through holes 7, 7A arranged. Will-one of these through holes 7, 7A with a pin 9, 9A equipped, this pin 9, 9A can be placed on the transverse edges of the boards 40, 44 will.

As a result, the same boards can be reached again on both boards 40, 44 Distance from the transverse edge to the borehole. Since the board to be drilled on the front wall 40 has to be rotated by 1800 for drilling, the starting position will be for both boards 40, 44 marked by crosses 51, 52.

By turning the first board 40, this board 40 the first hole on the right and, in the case of the other board 44, the first hole on the left. This means that the drilling aid on the first board 40 with the help of a in the through hole 7A inserted pin 9A and on the second board. 44 with the help of one in the through hole 7 inserted pin 9 is applied. Since both through holes 7, 7A are the same Distance from the center, you always get the same distance from the transverse edge to the drill hole and therefore always aligned drill holes and edges.

Since the drilling aid is always in contact with three sides of the board, it can do it well be fixed so that it cannot slip when drilling. As a result of the double Leadership of the Drill you get straight drill holes here too. The drilling depth setting is particularly important here and is done by clamping of the locking ring 21 set on the scale 20.

Once the first hole has been drilled, a suitable pin is inserted into it plugged. The pin 9, 9A, which is used to rest against the transverse edge, is removed. In the through hole 7, 7A that is now free becomes the spacer strip 28 from below plugged in. So that this spacer bar 28 does not protrude from the plate bottom, has this has two depressions 47 in these areas. The spacer bar 28 runs in the extension of the longitudinal axis 5 of the plate 1 and has at different distances round, vertically extending through holes 29, the widths of which correspond to the widths of the Correspond to drill holes. The spacer bar 28 is made with the help of one of the through holes 29 connected to the pin inserted in the first borehole. You get one like that fixed distance from the first borehole to the second, which is also on the other board 40,44 can be taken over. In addition, the drilling aid is prevented from slipping secured.

On both sides of the through holes arranged on the longitudinal axis 5 7, 7A are further round, vertically extending through holes 8, 8 the have the same distance to the transverse axis 6 of the plate 1 as the through holes 7, 7A. If the holes on the flat side of the rectangular second board 44 now not along the long edge but further offset towards the middle of the board run at right angles to the transverse edge, they become one on both sides Through holes 7, 7A located through holes 8, 8A equipped with pins. Then the cover 25 is placed on the plate 1 and the drilling aid is put on in this way the board 44 set, that the two pins in the through holes 8 or 8A rest against the transverse edge of the board 44 and the opposite, on Lugs 27 or 27A attached to the bottom of the lid on a previously drawn scribe line is directed.

Through the foam rubber covering 26 attached to the cover 25, the auxiliary drilling device Do not slip when drilling. The drilling is carried out exactly through the marking line through.

The other drill holes are made again with the help of the spacer bar 28 made. To use this spacer strip 28 even with the cover 25 attached to be able to, the side walls of the cover 25 are interrupted at these points.

Since the drills have different neck thicknesses, different Rings 22 are provided which have corresponding openings 43.

Instead of the different pairs of through holes 4, 4A in the plate 1, only one pair of through holes can be provided. In these through holes you can Pins are inserted that emerge on the underside of the plate and a square bar 35 can accommodate, which in turn now has several pairs of holes 36, 36A, the have different distances to the edge of the strip. The distance between the holes in a pair of holes 36, 36A to one another corresponds to the hole spacing of the pair of through holes in the plate 1.

According to the board thickness, this square bar 35 is now offset.

In another embodiment, that is up from plate 1A extending neck 12A rotatably mounted. This rotatable neck 12A has at the lower ad an outwardly directed approach 48, which with a round, vertically extending A through hole is provided into which a pin 49 can be inserted. This pen 49 takes effect into an opening 50 provided in the plate A enters and exits from the underside of the plate. The opening 50 runs In the shape of a circular arc from the longitudinal axis 5 to the transverse axis 6. A second co-running one Opening 50A is symmetrically opposite the first opening 50 arranged.

With this design it is possible to use the end wall of a board 40 even to include from four sides by after attaching the drilling aid on the board 40 of the neck 12A is rotated until the pin 49 on the second Long edge rests.

The drilling aid is preferably made of plastic and can be used for To save material, have further depressions on the underside of the plate.

Claims (5)

A n p r ict 1. Drilling aid for accurate depth and dust-free Making right-angled boreholes in walls, ceilings, etc. and for manufacturing deeper, straight and aligned drill holes in through pins at right angles boards to be connected to each other, thereby g e k e n n -z e i c h n .e t that a preferably rectangular plate 1 in the middle has a round, vertically extending opening 2 for receiving an exchangeable drill bush 3 and parallel to the longitudinal axis 5 of the plate 1 different round, vertically extending through holes 4, 4A are provided are, of which only two have the same distance to the longitudinal axis 5 of the plate 1, that on the longitudinal axis 5 of the plate 1 on both sides of the center and in the same At a distance from this, two further round, vertically extending through holes 7, 7A and on both sides of these through holes 7, 7A at the same distance from the transverse axis 6 of the plate 1 further through holes 8, 8A of the same type are arranged and all of these through holes 4, 4A, 7, 7A, 8, 8A with protruding on the underside of the plate Pins 9, 9A, 10 can be fitted so that the plate 1 is centered and at an angle having a hollow cylinder-shaped as 12 running upwards from 900, the Wall in the area of the root of the neck has an opening 11 and also in the one hollow cylindrical extension 13 introduced with a precise fit and by means of a clamp 14 is held by two at the upper edge of the llalses 12 arranged opposite one another Wall openings 15 engages in two grooves 18 running vertically in the extension 13, the scarce end over the lower edge that is between I: Ials bottom and the bottom of the extension 13 is a compression spring 19 that the wall the extension 13 is narrowed at the lower edge and with a circumferential cuff 17 is sealed with respect to the neck 12, that the bottom of the extension 13 is centered has an opening 41 and in the bottom a circular groove 16 that the Extension 13 provided on the outside with a depth scale 20 and determined by a ring 21 is spanned, that on the upper edge of the extension 13, a ring 22 is inserted is which has a circular groove 23, the outer limit of which is the outer diameter corresponds to the extension 13 and its inner limitation over the inner diameter the extension 13 extends beyond that on the underside of the plate 1 in the middle a recess 24 is located and in this recess 24 one from the edge of the central Opening 2 outgoing neck 38 extends partially that on the underside the plate 1, a cover 25 can be inserted, the bottom outside with a flexible foam rubber covering 26 or the like is provided that this cover 25 in the vertical extension of the central opening in the plate 1 2 and some through holes 7, 7A, 8, 8A also have openings 45, 46 can and two lying on the longitudinal axis, on both sides of the lid base has externally protruding lugs 27, 27A that in the underside of the plate in the area of the through holes 7, 7A arranged on the longitudinal axis 5, depressions are present are and here a spacer bar 28 can be inserted, which in extension the longitudinal axis 5 of the plate 1 different round, vertically extending through holes 29, the widths of which correspond to the widths of the holes to be drilled. 2. drilling aid according to claim 1, characterized in that the Drill bush 3 is provided with a collar, the downwardly extending neck 38 of the central opening 2 of the plate 1 overlaps, with its neck exactly in the middle Opening 2 fits and is secured by a union nut 32, the two hook-shaped Has extensions 30, which are located from below by two in the plate ceiling Openings 39 out and by turning the nut 32 with the plate ceiling get connected. 3. Drilling aid according to claim 1, characterized in that #the Drill bush 3A surrounded by a jacket 31 preferably made of plastic is, the one edge of a corrugated or otherwise provided with edges collar 33 and on the other edge has two opposing pins 34, the distance between the pins 34 to the federal government 33 corresponds to the thickness of the plate ceiling, the neck of the jacket in the central opening 2 of the plate 1 fits and two pins 34 corresponding to this opening 2 Recesses are attached. 4. drilling aid according to claim 1, 2 and 3, characterized in that that in the plate 1 instead of the many pairs of through holes 4, 4A along the longitudinal axis 5 only one pair of through holes is arranged through which protruding downward Pins can be inserted into the one square strip attached to the underside of the plate 35 can accommodate, which are now in turn pairs of holes 36, 36 A with different distances to the strip edge and the distance between the two holes of a pair of holes 36, 36A corresponds to the distance between the pair of holes in plate 1. 5. drilling aid according to claim 1, 2, 3 and 4 characterized thereby, that the attached to the plate 1A and extending upwardly hollow cylindrical Neck 12A is not firmly connected to the plate 1A but rotatably mounted, the Neck 12A at the lower edge a laterally outward approach 48 with a has round, vertically downward through hole into which a Pin 49 can be inserted into a provided in the plate 1A and from the longitudinal axis 5 running in a circular arc until it reaches the # transverse axis -6 Opening 50 engages and extends beyond the plate bottom and a second similar opening 50A of the first opening 50 is symmetrically opposite.