Drilling jig for eccentric screw dowel connectors

Abstract

The invention relates to a device for drilling holes for an eccentric screw dowel connector with two stop plates (1, 2) positioned at right angles to each other, wherein the stop plate (1) has guide openings (4, 5, 6) each with the same diameter (D2) into which a drill bit (25) with a large diameter (D2) can be inserted. A sleeve element (20) with an outer diameter corresponding to the diameter (D2) is inserted into one of the guide openings (5). The sleeve element (20) has an inner diameter of a smaller diameter (D1) for receiving a drill bit (18) with a smaller diameter (D1).

Description

field of technology

[0001] The invention relates to a device for drilling holes for an eccentric screw dowel connector, wherein a first stop plate has guide openings arranged in a line for guiding a first drill bit with a small diameter and a second drill bit with a larger diameter. A second stop plate can be fixed to an underside of the first stop plate by means of fixing elements such that an inner side of the second stop plate can assume different distances from the guide openings. State of the art

[0002] An eccentric screw dowel connector is used to connect two panels, particularly the body panels of a piece of furniture, at an butt or right angle. Three holes are drilled into the end face of a first panel. A middle hole accommodates an eccentric bolt that is attached to a second panel. The two outer holes are for dowels. The diameter of these holes is usually 8 mm. Two outer holes with an 8 mm diameter are drilled into the second panel at corresponding locations, but at the edge of the wide side, to accommodate the dowels, and a middle hole with a smaller diameter, usually 4 mm. However, there are also applications in which the diameter of the holes for the dowels is 5 mm, 6 mm, or 10 mm. The diameter of the middle hole can also have a different value, for example 5 mm.The eccentric bolt is screwed into this central hole. In addition, a hole for an eccentric disc must be drilled on the wide side of the first panel, level with the central hole there. The diameter of this hole is usually 15 mm. A common diameter is also 25 mm. An eccentric disc is inserted into this hole, into which the eccentric bolt protrudes when installed. By turning the eccentric disc, a tensile force can be applied to the eccentric bolt. Such a corner connection or butt connection can be released by turning the eccentric disc. Such holes are to be created using a device of this type. To ensure that the holes are each the same distance from an edge of the two panels, a stop element is provided, which must rest against the edge when the device is in use.The guide holes allow the larger-diameter drill bit to be guided to drill the holes for the dowels and the eccentric bolt. To drill the screw hole for the eccentric bolt, the smaller-diameter drill bit must be guided through the center hole. The second stop plate has a guide hole for a Forstner bit, located at the height of the center hole.

[0003] A generic device is described in CN 205021701 U.

[0004] A similar device is described in CN 2017020798. This device features drill sleeves with a threaded section that can be screwed into the internal thread of an insert located in a window of the first stop plate. To use drills with different diameters, the drill sleeves must be exchanged.

[0005] CN 215038248 and DE 10 2021 116 002 A1 each describe a drilling jig with an insert piece that has a guide opening for guiding a Forstner bit.

[0006] A doweling drilling jig is already known from DE 698 15 870 T2. This also discloses a drill bit with a stop body mounted on its shaft.

[0007] US 4,145,160 describes a drilling jig with guide holes formed by sleeves.

[0008] CN 204525670 U describes a drilling jig with a second stop plate movably attached to a first stop plate. Summary of the invention

[0009] The invention is based on the object of developing a generic device in a manner that is advantageous in use.

[0010] This object is achieved by the features specified in the claims, wherein the subclaims not only describe advantageous developments of the device specified in claim 1, but also represent independent solutions to the problem.

[0011] According to a first aspect of the invention, a device for drilling holes for an eccentric screw dowel connector is proposed, which device has two stop plates. A first stop plate has three guide openings, each for guiding a drill bit. The guide openings can be arranged in a line. It is provided that the three guide openings have the same inner diameter. This inner diameter corresponds to the outer diameter of the drill with the larger diameter, which is in particular 8 mm. However, the invention also encompasses devices in which the drill has a different diameter, for example 5 mm, 6 mm, or 10 mm. The inner diameter is then adapted to this diameter. In order to be able to guide the drill with the smaller diameter, a sleeve element is used according to the invention, which can be inserted into one of the guide openings, in particular into the middle guide opening.The sleeve element can be made of metal, in particular steel. It can be connected to the first stop plate in a rotationally fixed manner. In particular, it can be releasably inserted axially into the guide opening. The sleeve element can have a sleeve with an outer diameter that corresponds to the inner diameter of the guide opening. The outer diameter of the sleeve can accordingly also be 4 mm, 5 mm, 6 mm, or 10 mm. A collar with a larger diameter can be connected to the sleeve so that it can rest on the edge of the guide opening. Means can also be provided with which the sleeve element can be connected to the shaft of the drill in a rotationally fixed manner. For this purpose, for example, a grub screw can be screwed into a threaded opening in the collar. The latter is particularly advantageous if the bore is only intended to have a predetermined depth. The sleeve element can then simultaneously act as a stop body.Before drilling the hole with the smaller diameter, the sleeve element can be attached to the drill shaft at a defined distance from the tip of the drill bit's shank. The sleeve of the sleeve element then rotates within the guide opening. The guide opening has a defined axial length. The cylindrical sleeve section of the sleeve element can be fully inserted into the guide opening. The axial length of the sleeve section can correspond to the axial length of the guide opening. Preferably, however, the axial length of the sleeve section is slightly shorter than the axial length of the guide opening. A collar on the sleeve element can act as a stop. If the collar is located on one end of the guide opening, the end of the sleeve section opposite the collar is only slightly spaced from the surface of the workpiece.If the sleeve element is used as a stop element, it can be fixed to the drill shaft. The penetration depth of the drill is defined by the distance between the drill tip and the end of the sleeve element facing away from the collar.

[0012] According to a second aspect of the invention, which can be advantageously combined with the first aspect of the invention, the guide openings are each formed by sleeves made of a harder material. The sleeves can be made of metal. These sleeves can be pressed into a plastic base body. This base body can be either the first stop plate or an insert body fastened in the first stop plate. The sleeves preferably extend over the entire material thickness of the section of the stop plate that forms the guide openings.

[0013] According to a third aspect of the invention, which can be advantageously combined with the two aspects described above, the guide openings are formed by an insert piece that is fastened in a window of the first stop plate. The insert piece can be inserted into the window from an underside of the stop plate. The insert piece can have a circumferential collar that lies in a recess in the edge of the window, so that the underside of the insert piece lies flush with the underside of the stop plate. The outline of the edge of the collar can have a wave shape. Fastening screws can be provided that hold the insert piece in the window from the underside of the stop plate.For this purpose, opposing extensions of the collar, which in particular have curved edges, can have through-holes through which the fastening screws, preferably designed as countersunk screws, can be inserted. The stop plate can have a counter-thread. The counter-thread is preferably formed by a nut that is non-rotatably seated in a recess in the upper side.

[0014] According to a further aspect of the invention, which can be advantageously combined with the previously described aspects, a section forming the guide openings, for example the previously described insert piece or a support for the guide openings integrally connected to the stop plate, can protrude beyond an upper side opposite the underside. This makes it possible to design the stop plate flat, for example with a material thickness of less than 10 mm. The axial length of the guide openings is then at least twice the material thickness of the stop plate. The section protruding beyond the upper side can also be used as a handle.

[0015] According to a further aspect of the invention, which can be advantageously combined with the previously described aspects, at least one of the stop plates can have one or more markings. The markings can be arranged on the line in which the guide openings are located, so that these markings can be used to center the device relative to a line applied to the workpiece. However, it is also possible to use these markings to adjust the distance between the inside of the second stop plate and the centers of the guide openings. One or more markings can be provided that mark a second line that runs transversely to the previously described first line through the guide openings and that preferably runs through the center of the central guide opening. The first stop plate can also have a notch through the center of which the second line runs.The second stop plate can also have markings. The marking is preferably located in a plane perpendicular to the second line. The central guide opening and a guide opening of the second stop plate are preferably located in this plane. The markings can each be formed by elongated windows into which isosceles triangles protrude from the narrow sides. The two opposite vertices of the triangles define points on a straight line. The triangles have a thinner material than the stop plates in the area of ​​the edge of the window. The markings are arranged in particular near the narrow edge or the long edge of the stop plate.However, it is also possible to use rectangles instead of triangles, each extending over approximately a quarter of the window, so that rectangular projections of reduced material thickness extend from two diagonally opposite corners, adjacent to which rectangular clearances are located. Such markings are arranged, in particular, as a group, running diagonally to an edge in order to be able to adjust the distance between the second stop plate and the guide openings. This allows the device to be adapted to different board thicknesses. The fixing hole for the fixing screw, which can be used to connect the two stop plates to each other, can be designed as an elongated hole in this embodiment. This allows for continuous distance adjustment.

[0016] According to a further aspect of the invention, which can be advantageously combined with the previously described aspects, the second stop plate has the previously described guide opening for guiding a drill bit, with which the bore for receiving the eccentric disc can be created. This is preferably done with a Forstner bit. A guide element can also be provided, which can be connected to the edge of this guide opening and which has an inner diameter corresponding to the outer diameter of a drill bit, in particular a Forstner bit. The head of the drill bit, which has the cutting edges, can have a larger diameter than the inner diameter or the outer diameter of the drill bit shaft. When using such a guide element, the guide opening does not need to perform a guiding function. Its diameter can therefore be larger than the outer diameter of the head of the drill bit.

[0017] According to a further aspect of the invention, which can be advantageously combined with the aspects described above, the two stop plates are each made of plastic or metal, for example aluminum, and each have a rib structure on their backs. This can be a honeycomb-like rib structure or a different type of rib structure. The second stop plate can have a narrow side with a plurality of equally spaced screw-in openings. Threaded shafts of fixing screws can be screwed into the screw-in openings, with which the two stop plates can be connected to one another in such a way that a T-shape is created in cross-section. The first stop plate can have several rows of fixing holes that form groups, wherein the fixing holes of a group each lie on a line that has an inclination angle to the first line.By selecting the fixing hole, the distance between the second stop plate and the first line can be adjusted. Preferably, four such groups are provided. Nuts can be located in the screw-in openings, into whose internal thread the fixing screw can be screwed. The fixing holes can have a circular cross-section. However, they can also be elongated holes, and in particular oblong holes that run diagonally to an edge of the stop plate. It is also possible, however, for the fixing hole to be designed as an elongated hole that extends transversely to the line on which the guide openings lie. With this configuration, the device is not adapted to the different board thicknesses by using different fixing holes. Instead, the adaptation takes place using the markings described above.

[0018] According to a further aspect of the invention, which can be advantageously combined with the previously described aspect, a stop element is provided. The stop element can be attached to one of the stop plates at a predetermined spacing and projects into the space defined by the inner side of the second stop plate and the underside of the first stop plate. The stop element is preferably formed by a stop pin with a head and a shaft. The shaft can be inserted through a bore in the first or second stop plate, wherein this bore advantageously lies on the first line. In a symmetrical arrangement to the plane described above, in which the second line runs, two bores for inserting the stop element can be provided. The two stop plates can, in particular, have a folding symmetry with respect to this plane.The second stop plate can also have holes arranged in a line for inserting the stop element. The lines along which the two holes for inserting the stop element extend preferably lie in a longitudinal center plane of the first stop plate and the second stop plate, respectively.

[0019] According to a further aspect of the invention, which can be advantageously combined with the previously described aspects, one of the two stop plates has one or more setting gauges for adjusting the distance between the tip of a drill bit shank and a stop body attached to the shank. The setting gauge can be a recess, in particular a trough-shaped recess, in a broad side surface of the stop plate. The diameter of the recess is only slightly larger than the diameter of the drill bit shank or the outer diameter of a sleeve element through which the drill bit extends. The recess opens into a narrow side of the stop plate and forms an opening there.A scale extends along the edge of the recess, the zero point of which is offset from the opening of the recess by the dimension. This allows the adjustment of the distance by which the drill bit penetrates the workpiece until the stop body strikes the edge surrounding the guide opening. The zero point of the scale can be offset from the lateral opening of the recess. The dimension of this offset preferably corresponds to the axial length of one of the guide openings or all guide openings that have the same axial length.

[0020] According to a further aspect of the invention, the device can also be used to produce a row of holes. The holes, for example for inserting shelf supports, are typically 32 mm apart in furniture construction. The diameter of these holes is usually 5 mm. According to the invention, the guide openings can be spaced apart at a distance that corresponds exactly to the standard hole spacing of a row of holes in furniture construction, i.e. 32 mm. By means of a guide, e.g. another workpiece, a guide edge can be created along which the device can be slid. A mandrel can be inserted into the last hole in the row of holes and protrudes through one of the guide openings. If the guide opening has a diameter that is larger than the standard diameter, for example 5 mm, a reducing sleeve can be used, which is inserted into the guide opening. The inner diameter of this reducing sleeve is 5 mm.A mandrel can be inserted through the first guide hole and into the last hole in the row. Using the two remaining guide holes, two more holes can then be drilled at standard spacing, for which the reducing sleeve can be used.

[0021] According to a further aspect of the invention, workpieces can also be butt-jointed or joined at a right angle without using an eccentric clamping element. In this case, the guide openings are used exclusively to drill holes for dowels.

[0022] The fixture is used to drill holes for an eccentric screw dowel connector. The fixture can also be used to create a row of holes or to connect workpieces using dowels alone. Short description of the drawings

[0023] Embodiments of the invention are explained below with reference to the accompanying drawings. They show: Fig. 1 a first perspective view of a first embodiment, Fig. 2 a second perspective view of the first embodiment, Fig. 3 a third perspective view of the first embodiment, Fig. 4 a plan view of the first stop plate 1, Fig. 5 a plan view of a narrow side of the second stop plate 2, Fig. 6 a plan view of the outside of the second stop plate 2, Fig. 7 a side view, Fig. 8 the section along the line VIII-VIII in Fig. 6, Fig. 9 the section along the line IX-IX in Fig. 4, Fig. 10 the section along the line XX in Fig. 4, Fig. 11 the section along the line XI-XI in Fig. 4, Fig. 12 an exploded view of the elements of the first embodiment, Fig. 13 an application case of the first embodiment, Fig. 13a a cut like Fig. 11, but with a workpiece 54 for producing holes in a broad side of the workpiece 54, Fig. 14 an application for drilling holes in a narrow side of the workpiece 54, Fig. 15 an application for drilling a second broadside hole in the workpiece 54, Fig. 16 a section through the device and the workpiece 54 through a guide opening 35, Fig. 17 is a perspective view of a second embodiment of the invention, Fig. 18 a side view of the second embodiment, Fig. 19 enlarges section XIX in Fig. 18, Fig. 20 enlarges section XX in Fig. 18, Fig. 21 is a perspective sectional view, the section plane passing through the axes of the guide openings 35 and 5, Fig. 22 a bottom view of the second embodiment, Fig. 23 shows another application in which the device is used to produce a row of holes, Fig. 24 the section along the line XXIV-XXIV in Fig. 23. Description of the embodiments

[0024] The Fig. The first embodiment shown in Figures 1 to 16 has a substantially rectangular first stop plate 1 made of plastic and a substantially rectangular second stop plate 2 also made of plastic, wherein the widths and lengths of the two stop plates 1, 2 can be substantially identical.

[0025] The first stop plate 1 has three guide openings 4, 5, 6, which lie on a first line L1 running in a center line between two longitudinal edges of the stop plate 1. The guide openings 4, 5, 6 are formed by an insert 3, which is inserted into a window 7 of the stop plate 1. The insert 3 forms a circumferential collar 8, which, when inserted, lies in a circumferential recess 9 of the window 7. The recess 9 is located on the underside 1" of the stop plate 1. The window 7 and the edge or collar 8 of the insert 3 are wave-shaped.

[0026] The insert 3 is made of a greater material thickness than the stop plate 1. When assembled, the insert 3 forms a raised portion in the center of the upper side 1' in the shape of a base. This can be used as a handle. Guide openings 4, 5, 6 open into the end face of the insert 3. The guide openings 4, 5, 6 are each formed by a sleeve 10, which is preferably made of metal. The sleeves 10 have the same inner diameter D0, which is preferably 8 mm.

[0027] In the upper side, there are hexagonal recesses, also arranged on the first line L1, in each of which a nut 12 is located. From the underside 1", a fastening screw 11 is screwed into this nut 12. This fastening screw has a countersunk head and passes through a fastening opening of an extension of the collar 8. The insert piece 3 is connected to the first stop plate 1 at two diametrically opposite ends by two fastening screws 11.

[0028] On line L1, there are also two holes 15, each of which can optionally accommodate a stop element 14. The stop element 14 has a head 14" and a shaft 14'. The shaft protrudes 1" beyond the underside.

[0029] Two additional markers 42 are located on line L1. These markers preferably consist of a window in the shape of an elongated rectangle. Isosceles triangles 40' extend from the narrow sides of the window into the window surface. The vertices of the triangles 40' lie on line L1.

[0030] A second line L2, which is perpendicular to the first line L1, runs through the axis of the central guide opening 5. The second line L2 runs through another marking 40, which has the previously described shape. The line L2 also runs through a notch 41, which has two parallel walls, which are spaced apart by a distance corresponding to the diameter D0 of the guide opening 5.

[0031] The first stop plate 1 also has four groups of eight fixing holes 16 each, with the individual fixing holes 16 of each group being at a different distance from a longitudinal edge of the stop plate 1. The fixing holes 16 of each group lie on a common line that runs diagonally to the longitudinal edge. The first stop plate 1 can be connected to a second stop plate 2 using fixing screws 13. The distance of an inner side 2' of the second stop plate 2 from the line L1 can be determined by selecting the fixing hole 16 into which the shaft 13' of the fixing screw 13 is inserted. The fixing screw 13 has a head 13" with a knurled peripheral surface. A total of two fixing screws 13 are provided, with each fixing screw 13 being assigned to one of the groups.

[0032] The second stop plate 2 has a narrow side with a plurality of screw-in openings 17. The shaft 13' of the fixing screw 13 can be inserted into these screw-in openings 17. A nut 38 is inserted into the screw-in opening 17, into which a threaded shaft 13''' of the fixing screw 13 can be screwed.

[0033] When connected, the narrow side of the second stop plate 2 abuts the underside 1" of the first stop plate 1. The second stop plate 2 protrudes at a right angle from the underside 1".

[0034] The second line L2 runs in a plane E1, which is perpendicular to the plane of extension of the first stop plate 1 and perpendicular to the plane of extension of the second stop plate 2. The center of the central guide opening 5 and the center of a guide opening 35 of the second stop plate lie in this plane. In the edge area of ​​the guide opening 35 are several fastening openings 36, with which a guide element 32 for guiding a Forstner bit can be temporarily attached to the back of the stop plate 2.

[0035] In a longitudinal center plane through the second stop plate there are also two holes 37 each for inserting a stop element 14.

[0036] A sleeve element 20 is provided, which is made of metal. The sleeve element 20 has rotational symmetry and forms a sleeve section 21, which has an outer diameter corresponding to the inner diameter D0 of the guide opening 4, 5, 6. The inner diameter of the sleeve section 21 corresponds to the diameter D1 of a shaft 19 of a drill 18. The diameter D1 is preferably 4 mm. The sleeve section 21 protrudes from a collar 22, which has a larger diameter than the diameter D0. The axial length of the sleeve section 21 can correspond to the axial length of the guide opening 4, 5, 6 or the sleeve 10 forming it. Preferably, however, the axial length of the sleeve portion (21) is slightly shorter than the axial length of the guide opening 4, 5, 6 or of the sleeve 10 forming it. The sleeve portion 21 of the sleeve element 20 lines the sleeve 10 when it is inserted in the sleeve 10.

[0037] A clamping element, for example a grub screw 23, may be provided with which the sleeve element 20 can be fastened to the shaft 19 of a drill 18. The collar 22 can then be used as a stop element.

[0038] A further drill 25 is provided, the shank 26 of which has a diameter D2 corresponding to the diameter D0, i.e., in particular, 8 mm. A stop body 27 can be attached to the shank 26 of the drill 25.

[0039] A further drill bit 28 is provided. This is, in particular, a Forstner bit with a shaft 29 and a head 30, wherein the diameter D5 of the head 30 can be larger than the diameter D4 of the shaft 29. A guide element 32, which has fastening pins 44 that can be inserted into the above-described fastening openings 36 on the back of the second stop plate 2, has a guide sleeve 33 whose inner diameter corresponds to the diameter D4 of the shaft 29. The diameter D3 of the guide opening 35 can be larger than the diameter D5 of the head 30.

[0040] In a variant, however, a Forstner bit can also be used, the shaft of which has a diameter corresponding to the diameter D5 of the guide opening 35 and the head of which has a diameter corresponding to that of the shaft.

[0041] A second embodiment of the invention, which is shown in the Fig. The stop plate shown in Figures 17 to 22 also has a first and a second stop plate 1, 2, which can be connected to each other to form a T-shape. However, the distance is adjusted using markings. The fixing screws 13 extend through elongated holes 16 that extend transversely to line L1.

[0042] The second stop plate 2 has two setting gauges 45, 46, each formed by a recess 47 that is open to a narrow side of the stop plate 2. The diameter of the preferably trough-shaped recess 47 approximately corresponds to the diameter of the shaft 26 of a drill or the outer diameter of a sleeve section 21, 51 of a sleeve element 20, 50 that can be fastened to the shaft 29, 19. The length of the sleeve section 21, 51 can correspond to the axial length of the sleeve 10 lining the guide opening 4, 5, 6. The diameter of the sleeve section 51 of the sleeve element 50 can correspond to the material thickness of the second stop plate. The guide opening 35 can also have a metal sleeve. The sleeve section 51 can have the same diameter as the head 30. The diameter can correspond to the inner diameter of the guide opening 35.

[0043] A scale 49 is provided, the zero point of which is spaced from an opening 48 of the recess 47 to the narrow side by the amount of the axial length of the guide opening 4, 5, 6, 35. The scale marks of the scale 49 can extend to the bottom of the recess 47, so that the setting gauge 45, 46 can be used to set the length of the drill bit that enters the workpiece when drilling holes for dowels or an eccentric bolt, or for inserting the eccentric disc.

[0044] The devices shown in the drawings are suitable for drilling holes for an eccentric screw dowel connector in two workpieces to be joined. Fig. 13 shows, using the first embodiment as an example, the drilling of holes into a broad side surface of a workpiece 54. The inner side 2' of the stop plate 2 is brought against the narrow side of the workpiece 54. The shaft 14' of the stop element 14 rests against a narrow side of the workpiece 54 at a right angle thereto. Holes for inserting dowels can be made with the drill 25. For this purpose, the shaft 26 of the drill 25 is guided in the two outer guide openings 4, 6. The penetration depth of the drill shaft 26 into the workpiece 54 is defined by the stop body 27.

[0045] The sleeve element 20 is clamped onto the shaft 19 of the drill 18. It is secured to the shaft 19 by means of the clamping screw 23. The collar 22 forms a stop element. The portion of the drill 18 that protrudes beyond the lower end edge of the sleeve 21 creates a recess for screwing in an eccentric pin. The drilling is carried out using the central guide opening 5.

[0046] First, the distance between the guide openings 4, 5, 6 and the inner side 2' of the second stop plate 2 is adjusted. This is done such that the axes of the guide openings 4, 5, 6 are spaced from the inner side 2' by half the material thickness of the workpiece.

[0047] The holes are then drilled in a narrow side of another workpiece 54. For this purpose, the inner side 2" is placed on the wide side of the workpiece, with the shaft 14' of the stop element 14 resting against a peripheral edge of the workpiece. The underside 1" lies on the narrow side of the workpiece. An 8 mm drill is now guided through each of the three guide openings 4, 5, and 6 to produce three holes. The two outer holes are for inserting dowels and the middle hole for the entry of an eccentric bolt, see Fig. 14.

[0048] A hole is then drilled through the guide opening 35 using a Forstner bit 28, into which the central hole on the narrow side opens. This wide side hole is intended to accommodate the eccentric disc, see Fig. 15 and Fig. 16.

[0049] In particular, it is provided that the stop plate 1 has a projection that is integrally connected to the rectangular base body of the stop plate 1 and protrudes from its broad side surface. This projection can form a handle that has ribbing or grooves on its peripheral wall. This handle forms a flat surface in which the guide openings 4, 5, 6 extend. The guide openings 4, 5, 6 are formed by metal sleeves 10 that are pressed into the plastic of the base body. The guide opening 35 of the stop plate 2 is also formed by a metal sleeve that is pressed into the plastic material of the stop plate 2.

[0050] The stop plate 1 has a plurality of markings 52, each with rectangular surface sections, whose edge edges are aligned with each other to form a cross. The marking edges running transversely to the longitudinal direction of the stop plate 1 can be aligned with an edge of the other stop plate 2. Several markings 52 are provided, each defining adjustment lines that have different distances from a line L1 running through the centers of the guide openings 4, 5, 6. This allows the distance between the inner side 2' of the stop plate 2 and the centers of the guide openings 4, 5, 6 to be adjusted.

[0051] Alternatively, you can also use the Fig. 22 markings 52 shown below can be used by bringing the adjustment lines defined by the rectangles 53 into alignment with the edge of a workpiece.

[0052] The Fig.23 shows a further use of the device according to the invention for producing a row of holes. The row of holes consists of a plurality of holes 56 arranged in a line, which extend parallel to the edge of a workpiece 54. The spacing B of the holes 56 is 32 mm. To produce this row of holes, a guide 55 is used, which is another workpiece that forms a guide flank that runs parallel to the edge of the workpiece 54. The row of holes can be produced by means of the guide openings 4, 5, 6, which are 32 mm apart. For this purpose, the stop plate 1 is brought with one narrow side against the guide flank of the guide 55. A mandrel 58 is inserted through the guide opening 4 into an already drilled hole 56.If the guide openings 4, 5, 6 have a diameter greater than 5 mm, a sleeve element 57 is used as a reducing sleeve. This sleeve has an outer diameter corresponding to the inner diameter of the guide openings 4, 5, 6 and an inner diameter of 5 mm, so that the holes 56 can be drilled with a 5 mm drill bit. Two additional holes 56 can then be drilled through the guide openings 5, 6 or through the sleeve elements 57 inserted therein before the device is moved further to drill two more holes.

[0053] The above statements serve to explain the inventions covered by the application as a whole, which each independently develop the state of the art by at least the following combinations of features, whereby two, several or all of these combinations of features can also be combined, namely:

[0054] A device for drilling holes for an eccentric screw dowel connector, comprising a first stop plate 1 having guide openings 4, 5, 6 arranged on a line L1 for guiding a first drill 18 with a small diameter D1 and a second drill 25 with a larger diameter D2, comprising a second stop plate 2 which is fastened or can be fastened to an underside 1" of the first stop plate 1 by means of fixing elements 13, 16, 17 with a variable distance between its inner side 2' and the guide openings 4, 5, 6, wherein the guide openings 4, 5, 6 each have the same inner diameter D0 corresponding to the larger diameter D2. In particular, a sleeve element 20 is provided which has a sleeve portion 21. The sleeve portion 21 can have an outer diameter corresponding to the larger diameter D2.An inner diameter of a cavity of the sleeve portion 21 for inserting the shaft 19 of the first drill 18 has an inner diameter that corresponds to the small diameter D1. The device is particularly characterized in that the sleeve element 20, with its sleeve portion 21, is inserted into a guide opening 5, in particular the central one, such that a collar 22 forming a stop rests against an edge surface of the guide opening 5. In particular, it is provided that the collar rests on a metal sleeve 10 lining the guide opening 5.

[0055] A device characterized in that the sleeve element 20 has a clamping element 23 with which it can be fastened to the shaft 19 of the first drill 18 at an adjustable distance from the tip of the shaft 19.

[0056] A device characterized in that the sleeve element 20 has a collar 22 whose diameter is larger than the outer diameter of the sleeve portion 21.

[0057] A device characterized in that the axial length of the sleeve portion 21 is equal to or less than the axial length of the guide opening 4, 5, 6.

[0058] A device characterized in that the guide openings 4, 5, 6 are each formed by sleeves 10 made of a harder material.

[0059] A device characterized in that the guide openings 4, 5, 6 are formed by an insert 3 which is fixed in a window 7 of the first stop plate 1.

[0060] A device characterized in that a section of the first stop plate 1 forming the guide openings 4, 5, 6 projects beyond an upper side 1' opposite the underside 1".

[0061] A device characterized in that one or more markings 42 lie in the line L1.

[0062] A device characterized in that one of the two stop plates 1, 2 has one or more setting gauges 45, 46 for adjusting the distance between a tip of a shaft 19, 26, 29 of a drill 18, 25, 28 and a stop body 20, 27, 31, 50 fastened to the shaft 19, 26, 29.

[0063] A device characterized in that the insert piece 3 has a collar 8 which lies in a recess 9 of the underside 1" of the first stop plate 1, wherein the collar has a fastening opening 43 in which a fastening screw 11 is inserted, which is screwed into an internal thread of the stop plate 1, and / or that the edge of the collar 8 has a plan view which is wavy, wherein the fastening openings 43 are formed by opposing arcuate extensions of the collar 8.

[0064] A device characterized by a third drill 28 having a shank 29 with a diameter D4 that is smaller than a diameter D5 of a head 30 of the drill 28 having cutting edges, and a guide element 32 having fastening elements 44 that can be connected to the second stop plate 2 by means of counter-fastening elements 36, the guide element 32 having a guide sleeve 33 whose inner diameter corresponds to the diameter D4 of the shank 29.

[0065] A device characterized in that the guide openings 4, 5, 6 form a central guide opening 5 whose axis lies in a plane E1 in which an axis of a guide opening 35 of the second stop plate 2 and / or a marking 39 of the second stop plate 2 lies.

[0066] All disclosed features are essential to the invention (individually, but also in combination with one another). The disclosure of the application hereby fully incorporates the disclosure content of the associated / attached priority documents (copy of the prior application), also for the purpose of incorporating features of these documents into claims of the present application. The subclaims, even without the features of a referenced claim, characterize independent inventive developments of the prior art with their features, in particular for filing divisional applications based on these claims. The invention specified in each claim may additionally comprise one or more of the features provided in the above description, in particular with reference numerals, and / or specified in the list of reference numerals.The invention also relates to designs in which individual features mentioned in the above description are not implemented, in particular insofar as they are clearly unnecessary for the respective intended use or can be replaced by other technically equivalent means. List of reference symbols 1 stop plate 1' top 1" bottom 2 stop plate 2' inside 3 insert 4 Guide opening 5 Guide opening 6 Guide opening 7 windows 8 collars 9 Deepening 10 sleeves 11 Fixing screw 12 Mother 13 Fixing screw 13' shaft 13'' head 13''' threaded shaft 14 Stop element 14' shaft 14" head 15 Hole for stop element 16 Fixing hole for fixing screw 17 Screw-in opening 18 drills 19 shaft 20 sleeve element 21 Sleeve section 22 collars 23 clamping element, grub screw 24 bore 25 drills 26 shaft 27 stop bodies 28 drills 29 shaft 30 heads 31 stop bodies 32 guide element 33 Guide sleeve 34 Fastening section 35 Guide opening 36 Mounting hole 37 Hole for stop element 38 mother 39 Marking 40 Marking 40' triangle 41 incision 42 Marking 43 Mounting hole 44 Fixing pin 45 Setting gauge 46 Setting gauge 47 Deepening 48 Opening 49 scale 50 stop body, sleeve element 51 Sleeve section 52 Marking 53 Rectangle 54 Workpiece 55 leadership 56 holes 57 Sleeve element D0 inner diameter D1 diameter D2 diameter D3 inner diameter D4 diameter D5 diameter A distance B Distance L1 line L2 line E1 level QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 205021701 U

[0003] CN 2017020798

[0004] CN 215038248

[0005] OF 10 2021 116 002 A1

[0005] OF 698 15 870 T2

[0006] US 4,145,160

[0007] CN 204525670 U

[0008]

Claims

[1] Device for drilling holes for an eccentric screw dowel connector, with a first stop plate (1) which has guide openings (4, 5, 6) arranged on a line (L1) for guiding a first drill (18) with a small diameter (D1) and a second drill (25) with a larger diameter (D2), with a second stop plate (2) which is fastened or can be fastened to an underside (1") of the first stop plate (1) by means of fixing elements (13, 16, 17) with a variable distance of its inner side (2') from the guide openings (4, 5, 6), wherein the guide openings (4, 5, 6) each have the same inner diameter (D0) corresponding to the larger diameter (D2), and with a sleeve element (20) which has a sleeve section (21) with an outer diameter corresponding to the larger diameter (D2) and an inner diameter corresponding to the small diameter (D1) corresponds. [2] Device according to claim 1,characterized by that the sleeve element (20) has a clamping element (23) with which it can be fastened to the shaft (19) of the first drill (18) at an adjustable distance from the tip of the shaft (19). [3] Device according to one of the preceding claims, characterized by that the sleeve element (20) has a collar (22) whose diameter is larger than the outer diameter of the sleeve section (21). [4] Device according to one of the preceding claims, characterized by that the axial length of the sleeve portion (21) is equal to or less than the axial length of the guide opening (4, 5, 6). [5] Device according to one of the preceding claims, characterized by that the guide openings (4, 5, 6) are each formed by sleeves (10) made of a harder material. [6] Device according to one of the preceding claims, characterized bythat the guide openings (4, 5, 6) are formed by an insert piece (3) which is fastened in a window (7) of the first stop plate (1). [7] Device according to one of the preceding claims, characterized by that a section of the first stop plate (1) forming the guide openings (4, 5, 6) projects beyond an upper side (1') opposite the underside (1"). [8] Device according to one of the preceding claims, characterized by that one or more markings (42) lie in the line (L1). [9] Device according to one of the preceding claims, characterized by that one of the two stop plates (1, 2) has one or more setting gauges (45, 46) for setting the distance between a tip of a shaft (19, 26, 29) of a drill (18, 25, 28) and a stop body (20, 27, 31, 50) fastened to the shaft (19, 26, 29). [10] Device according to one of the preceding claims, characterized bythat the insert piece (3) has a collar (8) which lies in a recess (9) of the underside (1") of the first stop plate (1), wherein the collar has a fastening opening (43) in which a fastening screw (11) is inserted, which is screwed into an internal thread of the stop plate (1), and / or that the edge of the collar (8) has a plan view which runs in a wave-like manner, wherein the fastening openings (43) are formed by opposing arc-shaped extensions of the collar (8). [11] Device according to one of the preceding claims, characterized bya third drill (28) having a shank (29) with a diameter (D4) that is smaller than a diameter (D5) of a head (30) of the drill (28) that has cutting edges, and a guide element (32) having fastening elements (44) that can be connected to the second stop plate (2) by means of counter-fastening elements (36), wherein the guide element (32) has a guide sleeve (33) whose inner diameter corresponds to the diameter (D4) of the shank (29). [12] Device according to one of the preceding claims, characterized by that the guide openings (4, 5, 6) form a central guide opening (5) whose axis lies in a plane (E1) in which an axis of a guide opening (35) of the second stop plate (2) and / or a marking (39) of the second stop plate (2) lies. [13] Device, characterized by one or more of the characterizing features of any of the preceding claims.

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