Cylinder head drill for a hinge drilling jig for producing a drilling pattern for hinges in a furniture panel

Abstract

Cylinder head drill (12) for a hinge drilling jig (10) for producing a drilling pattern for hinges (4) in a furniture panel (3a), comprising: - at least one shaft (40) rotatable about a rotation axis (39) for clamping the cylinder head drill (12) into the hinge drilling jig (10), - at least one cutting head (41) with at least one front-side main cutting edge (13) for producing a cylindrical recess (7) in the furniture panel (3a), - at least one chip breaker (14) for comminuting accumulating chip material, characterized in that the at least one chip breaker (14) is conical at least in some areas in order to force the chip material to be comminuted, starting from the axis of rotation (39), in a direction pointing away from the axis of rotation (39).

Description

The present invention relates to a cylinder head drill for a hinge drilling jig for producing a drilling pattern for hinges in a furniture panel, comprising:at least one shaft rotatable about an axis of rotation for clamping the cylinder head drill into the hinge drilling gauge,at least one cutting head with at least one front-side main cutting edge for producing a cylindrical recess in the furniture panel,at least one chipbreaker for crushing chip material produced.The invention further relates to a hinge drilling jig for producing a drilling pattern for hinges in a furniture panel having at least one cylinder head drill of the type to be described.A hinge-type drilling jig has been sold by the applicant for many years under the name "ECODRILL". This is a simple hand-held device that can be operated and transported for the precise drilling of holes in furniture parts. In this case, a specific hinge drilling pattern can be adjusted, so that the cylinder head drill can be drilled into the furniture part at a predetermined location by means of a hand drilling machine in order to produce a cylindrical bore for receiving a hinge pot. In addition to the central cylinder head drill, two lateral dowel drills are additionally provided, which have a smaller diameter than the cylinder head drill and which have for the production of further cylindrical bores for receiving an expandable fastening dowel of the furniture hinge.The arrangement of a chipbreaker on a core drill is disclosed, for example, in DE 3315539 A1. With the aid of the chipbreaker, the chips formed are broken and prevented from winding around the drill and accumulating there. The chipbreaker is in the form of a nose or plate and is disposed radially with respect to the drill.In particular when drilling medium-density wood fibre boards (MDF boards) or hardwood boards, there is a great problem that very long chips can form during drilling, which chips can wind around the drill, become entangled and scratch the surface of the furniture board. This can lead to the furniture panels, which often have a high-quality and expensive decorative coating, no longer being usable and to be disposed of. Moreover, the long chip formation prevents the drill from being restored, and moreover, a blockage of the chip space caused by the chips can lead to a large development of heat.The object of the present invention is to specify a cylinder head drill which is improved compared with the prior art.This is achieved according to the invention by the features of claim 1. Further advantageous embodiments of the present invention are defined in the dependent claims.According to the invention, the at least one chipbreaker is designed at least in regions conically in order to urge the chip material to be comminuted, starting from the axis of rotation, in a direction pointing away from the axis of rotation.With the aid of the proposed chipbreaker, the long chips can be forced against the edge of the bore starting from the axis of rotation of the cylinder head drill along a conical or frustoconical lateral surface of the chipbreaker, the chips being shredded by the rotating chipbreaker.The at least one chipbreaker can have at least one cutting surface for crushing the chip material and / or at least one, preferably trough-shaped and / or conically tapering, discharge channel for discharging chip material.According to one exemplary embodiment, the at least one chipbreaker can be designed as a component which is separate from the cylinder head drill and is firmly connected, preferably adhesively bonded, welded or pressed, to the cylinder head drill.Alternatively, it is possible to connect the chipbreaker and the cylinder head drill to one another in a releasable manner via at least one form-fit connection. In a connected state, the chipbreaker is connected to the cylinder head drill in a rotationally fixed manner via the at least one form-fit connection. In the event of possible damage or wear, the chipbreaker is easily replaceable.In a further exemplary embodiment, it can be provided that the at least one chipbreaker is formed integrally together with the cylinder head drill.Further details and advantages of the present invention are evident from the following description of the figures. FIGS. 1 a, 1 b show a piece of furniture with a furniture carcass and a furniture part which can be moved relative to the furniture carcass and the movable furniture part in perspective views, FIGS. 2 a, 2 b show an exemplary embodiment of a hinge drilling jig in two different views with the clamping lever in a clamping position and in a release position, FIGS. 3 a, 3 b show the hinge drilling jig in a view from the front and in a view from above, wherein the clamping lever is in a clamping position, FIGS. 4 a, 4 b show the hinge drilling jig with the clamping lever in a release position and in a clamping position, FIGS. 5 a, 5 b show the hinge drilling jig with the clamping lever in a release position and in a clamping position in partially broken-away views, FIGS. 6 a, 6 b show a cross section of the hinge drilling jig with the clamping lever in the release position and a side view of the hinge drilling jig with the clamping lever in the clamping position, FIGS. 7 a- 7 c show different views of a cylinder head drill with a chipbreaker, FIGS. 8 a, 8 b show the cylinder head drill in the mounted position in two different views.FIG. 1 ashows a piece of furniture 1 with a furniture carcass 2 and a furniture part 3 in the form of a furniture panel 3 athat is mounted movably relative to the furniture carcass 2. The movable furniture part 3 is mounted pivotably relative to the furniture carcass 2 via two or more hinges 4.The hinges 4 each have a hinge arm 5 to be fastened to the furniture carcass 2 and a hinge pot 6 to be fastened to the movable furniture part 3. The hinge cup 6 is pivotably connected to the hinge arm 5, for example via at least one hinge lever. The hinge cup 6 is to be fastened to the movable furniture part 3 by means of at least one fastening flange 9.FIG. 1 bshows the movable furniture part 3 in the form of the furniture panel 3 ain a perspective view. For fastening the hinge cup 6 to the furniture panel 3 a, a cylindrical recess 7, preferably with a diameter of 35 mm, is provided, wherein the hinge cup 6 is accommodated at least in regions within the cylindrical recess 7 in an assembled state on the furniture panel 3 a.In addition to the cylindrical recess 7, two lateral dowel holes 8 a, 8 bare provided, which are provided for receiving an expandable dowel (not shown) of the hinge 4. Such dowels may be arranged on an underside of the fastening flange 9 of the hinge 4.The cylindrical recess 7 for receiving the hinge cup 6 and the dowel holes 8 a, 8 bfor receiving dowels of the hinge 4 are each arranged at a predetermined distance relative to an end face 19 aand relative to side faces 19 b, 19 cof the furniture panel 3 a.However, the two lateral dowel holes 8 a, 8 bare not absolutely necessary, because the fastening flange 9 of the hinge 4 can also be fastened to the furniture panel 3 avia conventional screws.The cylindrical recess 7 for receiving the hinge pot 6 and the dowel bores 8 a, 8 bfor receiving dowels of the hinge 4 can be produced by means of a hinge drilling jig 10 (FIG. 2 a ) to be described later for producing a drilling pattern for the hinges 4 in the furniture panel 3 a.FIG. 2 ashows a possible embodiment of a hinge drilling jig 10 in a perspective view.The hinge drilling jig 10 includesat least one base body 11,at least one cylinder head drill 12 for producing a cylindrical recess 7 for receiving a hinge cup 6 in the furniture panel 3 a,at least two clamping devices 16 a, 16 b, spaced apart from one another, for clamping the furniture panel 3 arelative to the base body 11,at least one stop device 28 (FIG. 2 b) for bearing the base body 11 against an end face 19 a(FIG. 1 b) of the furniture panel 3 a,a clamping lever 15, by means of which the at least two clamping devices 16 a, 16 bcan be actuated jointly, and / or wherein the at least one stop device 28 is arranged in a central region of the at least one base body 11 between the at least two clamping devices 16 a, 16 b.The clamping levers 15 support the two clamping devices 16 a, 16 btogether such that they can be moved between a clamping position and a release position, wherein incorrect operations of the clamping devices 16 a, 16 bcan be avoided.The clamping devices 16 a, 16 bmay each have a fixing element 17 a, 17 b, preferably rotatably mounted, by means of which the furniture panel 3 acan be pre-clamped relative to the base body 11.For the final fixing of the furniture panel 3 arelative to the base body 11, a movable, preferably pivotable, clamping lever 15 is provided, wherein an essentially uniform clamping force can be exerted on the furniture panel 3 aby actuating the clamping lever 15 via the clamping devices 16 a, 16 b.The cylinder head drill 12 is rotatable via a rotary drive 18 a, wherein the cylinder head drill 12 is drivable by a rotation of the rotary drive 18 aby means of a hand drill 31 (FIGS. 4 a, 4 b ).In addition to the cylinder head drill 12, two further dowel drills 20 are provided, which are provided for drilling the two dowel bores 8 a, 8 b(FIG. 1 b). The dowel holes 8a, 8b are provided for receiving dowels of the hinge 4.However, the production of the dowel holes 8 a, 8 bmay be omitted, as already mentioned, since screws may also be provided for fastening the fastening flange 9 of the hinge 4.The two dowel drills 20 each also have a rotary drive 18 b, 18 c, wherein the dowel drills 20 can be set in rotation by driving the rotary drives 18 b, 18 cby means of a hand-held drilling machine 31.If, on the other hand, instead of the two dowel holes 8 a, 8 b, only a grain in the form of a marking is to be produced in the furniture panel 3 afor attaching a screw, additional parts (not visible here) in the form of spacers are provided. The spacers, which are preferably designed as C-clips, can be fitted onto the shaft below the rotary drives 18 b, 18 c. In this way, the rotary drives 18 b, 18 care movable only over a small partial region in the direction of the base body 11 when driven by the hand drill 31, so that substantially only the centering tip of the dowel drills 20 can be inserted into the furniture panel 3 ato produce the marking.The clamping lever 15 is mounted movably between a clamping position and a release position. FIG. 2 ashows the clamping position of the clamping lever 15 in which access to at least one rotary drive 18 a, 18 b, 18 c, preferably to all provided rotary drives 18 a, 18 b, 18 c, of the hinge drilling jig 10 is possible.If, on the other hand, the clamping lever 15 is in a release position, access to a rotary drive 18 a, 18 b, 18 c, preferably to all rotary drives 18 a, 18 b, 18 c, is blocked. This represents a considerable safety aspect because the rotary drives 18 a, 18 b, 18 care only accessible by means of a hand-held drilling machine 31 when the furniture panel 3 ais properly fixed relative to the base body 11 of the hinge-drilling jig 10.At least one stop 21 ais provided, which is mounted on the hinge drilling jig 10 so as to be movable, preferably fold out, and / or has at least one scale 22 afor indicating a distance of the cylinder head drill 12 relative to a side surface 19 b, 19 c(FIG. 1 b ) of the furniture panel 3 a. The position of the stop 21a along the scale 22a is lockable by a clamping screw 26a.By means of at least one suction opening 27, a suction of the chip material is possible. It is preferably provided that the at least one suction opening 27 extends obliquely in the direction of the cylinder head drill 12 and / or has at least one O-ring for clamping a suction connector.FIG. 2 bshows the hinge drilling jig 10 in a plan view, wherein the pivotable clamping lever 15 is in a release position. In the release position of the clamping lever 15, actuation of the rotary drives 18 a, 18 b, 18 cby the hand drill 31 is not possible, because the clamping lever 15 blocks access to the rotary drives 18 a, 18 b, 18 c.The hinge drilling jig 10 can have at least one handle 23, preferably in the form of a U-shaped bracket, for handling or transporting the hinge drilling jig 10.The at least one stop device 28 for bearing the base body 11 against an end face 19 a(FIG. 1 b) of the furniture panel 3 ais arranged in a central region of the at least one base body 11 between the at least two clamping devices 16 a, 16 b.The stop device 28 can have a movable, preferably linearly displaceable and / or continuously adjustable, stop plate 28 afor bearing against the furniture panel 3 a.In the exemplary embodiment shown, a position of the stop plate 28 acan be adjusted via at least one slot 28 band / or, after adjustment has been completed, can be fixed by a rotatably mounted knurled screw 28 c.Of course, other possibilities can also be provided for, preferably continuously variable, setting of the stop plate 28 a, for example at least one self-locking setting wheel, a self-locking eccentric or a self-locking worm gear.The stop device 28 can have at least one window 24, which allows a view to a marking 25 arranged or arrangeable on the furniture panel 3 a. The window 24 is designed to be relatively large, so that a marked reading possibility of the marking 25 is available.FIG. 3 ashows the hinge drilling jig 10 in a view from the front, wherein the cylinder head drill 12, the chip breaker 14 and the two lateral dowel drills 20 are shown.It can be seen that the at least one cylinder head drill 12 and at least one dowel drill 20, preferably both dowel drills 20, are offset relative to one another by an amount X in the height direction, preferably by approximately 3 mm.The offset arrangement between the cylinder head drill 12 and the lateral dowel drills 20 reduces the risk of long chips becoming jammed and consequently a decorative surface of the furniture panel 3a being scratched.The cylinder head drill 12 and the dowel drill 20 can each be driven separately from one another by a rotary drive 18 a, 18 b, 18 c. For driving the rotary drives 18 a, 18 b, 18 c, a hand-held drilling machine 31 and a screw bit 30 (FIGS. 4 a, 4 b ) engageable with the rotary drives 18 a, 18 b, 18 care required. The screw bit 30 can be designed, for example, as a cross screw bit, as a pocitriv bit or as a torx bit.FIG. 3 bshows the hinge drilling jig 10 in a view from above, wherein the furniture panel 3 ais fixed in a clamping manner by the pivot lever 15. The pivot lever 15 is thus located in a clamping position in which access to the rotary drives 18 a, 18 b, 18 cwith a hand-held drilling machine 31 is possible. In the release position of the clamping lever 15, on the other hand, access to the rotary drives 18 a, 18 b, 18 cis blocked.In addition to the stop 21 ashown in FIG. 2 a, the hinge drilling jig 10 has at least one further stop 21 b, wherein the stop 21 ais provided for bearing against a first side surface 19 b(FIG. 1 b) of the furniture panel 3 aand the further stop 21 bis provided for bearing against the second side surface 19 cof the furniture panel 3 a.The position of the further stop 21b along the scale 22b can be fixed by means of a fixing screw 26b.The two stops 21 a, 21 bcan be folded in relative to the base body 11 of the hinge drilling jig 10 when not in use.The distance of the cylinder head drill 12 relative to the end face 19 aof the furniture panel 3 acan be adjusted by the stop device 28. The stop device 28 comprises a linearly displaceable and / or continuously adjustable stop plate 28 awhich is configured to bear against the end face 19 aof the furniture plate 3 a.To adjust the stop plate 28 a, the thumb screw 28 cis loosened and the stop plate 28 ais displaced via the at least one elongated hole 28 bto the desired position. The preset position of the stop plate 28a can subsequently be fixed again by the knurled screw 28c.For reading a position of the stop device 28, at least two scales 29 a, 29 bare provided, wherein a first of the two scales 29 aindicates a distance to a center of the cylindrical recess 7 to be produced and a second of the two scales 29 bindicates a distance to an edge of the cylindrical recess 7 to be produced.The provision of two scales 29 a, 29 bhas the advantage that in connection with a corpus configurator or a product catalog for drilling the cylindrical recess 7, there are two different dimensional details which can be displayed by the two scales 29 a, 29 b. Of course, only a single one of the two scales 29 a, 29 bmay be provided.According to one exemplary embodiment, it can be provided that the at least one base body 11 has at least one receiving compartment 50 for receiving a drilling jig 51, preferably designed as a mounting bracket, for a hinge arm 5 of a hinge 4.At least one magnet 52 can be used for the detachable fastening of the drilling jig 51 in the receiving compartment 50. The drilling jig 51 designed as an additional part is designed to produce a drilling pattern for the hinge arm 5 on the furniture carcass 2.FIG. 4 ashows the hinge drilling jig 10 with the base body 11, the handle 23 arranged on the base body 11 and the clamping lever 15 pivotable relative to the base body 11.In FIG. 4 a, the clamping lever 15 is in a release position in which the clamping lever 15 covers the rotary drive 18 aof the cylinder head drill 12 at least in regions and thus access to the rotary drive 18 ais blocked. In FIG. 4 a, therefore, an actuation of the rotary drive 18 aby means of the helical bit 30 of the hand-held drilling machine 31 is not possible.In FIG. 4 b, on the other hand, the clamping lever 15 is in a clamping position in which the rotary drive 18 aof the cylinder head drill 12 is freely accessible for the screw bit 30 of the hand drill 31. In the clamping position of the clamping lever 15, the cylindrical recess 7 in the furniture panel 3 acan therefore be drilled at a predetermined point by driving the rotary drive 18 aby means of the hand-held drilling machine 31.FIG. 5 ashows a partially broken-away view of the hinge drilling jig 10 with the clamping lever 15 in the release position. The clamping devices 16 a, 16 bhave in each case an axle 33, which is guided with play in an elongated hole 32.The clamping lever 15 is mounted on the base body 11 such that it can rotate about an axis of rotation 37 (FIG. 6 a ) and / or has at least one eccentric surface 34 arranged on the clamping lever 15 for moving the at least two clamping devices 16 a, 16 brelative to the base body 11.The axis of rotation 37 of the clamping lever 15 extends substantially at right angles to the axis of rotation 39 (FIGS. 7 a- 7 c ) of the cylinder head drill 12.The axle 33 is connected to a clamping bracket 35 (FIGS. 6 a, 6 b ) which is designed to bear against an underside 19 d(FIGS. 6 a, 6 b ) of the furniture panel 3 a.At least one clamping device 16 a, 16 b, preferably both clamping devices 16 a, 16 b, has or have at least one energy store 38 (FIG. 6 b ) which applies a force to the clamping bracket 35 in the direction of a position clamping the furniture panel 3 apreclamping.The clamping position of the shaft 33 connected to the clamping bracket 35 can be fixed by the rotatable fixing elements 17 a, 17 b.However, the locking of the clamping position by the locking elements 17 a, 17 bis only necessary once. Once the pre-clamping position relative to a material thickness of the furniture panel 3 ais set, clamping and releasing of the furniture panel 3 ais brought about only by actuating the clamping lever 15.FIG. 5 bshows a partially broken-away view of the hinge drilling jig 10 with the clamping lever 15 in the clamping position.The axle 33 can be moved by a pivoting movement of the clamping lever 15 starting from the release position according to FIG. 5 ainto the clamping position according to FIG. 5 b, wherein the axle 33 is located at one end of the slot 32 and wherein the clamping position of the clamping lever 15 is fixed by the eccentric surface 34.FIG. 6 ashows a cross section of the hinge drilling jig 10 with the clamping lever 15 in the release position, in which the rotary drive 18 aof the cylinder head drill 12 is not accessible for actuation by means of the hand drill 31.The clamping device 16 a, 16 bhas at least one clamping bracket 35 for bearing against an underside 19 dof the furniture panel 3 a. At least one energy store 38 (FIG. 6 b ) applies a force to the clamping bracket 35 in the direction of a position clamping the furniture panel 3 aprestating. The at least one energy accumulator 38 can be designed, for example, as a tension spring or as a compression spring.By applying force to a handle 36 counter to a force of the force accumulator 38, the pre-clamping position of the clamping bracket 35 can be released.In the exemplary embodiment shown, the pre-clamping position of the clamping bracket 35 is releasable by pressing the handle 36 in a downward direction (i.e. in a direction running parallel to the axis of rotation 39 of the cylinder head drill 12). In this way, the clamping bracket 35 is moved downward, so that the furniture panel 3 aand the hinge drilling jig 10 can be aligned relative to each other or separated from each other.If the furniture panel 3 ais finally correctly oriented relative to the hinge drilling jig 10, the pre-clamping position of the furniture panel 3 acan be pre-fixed by the clamping element 17 a, 17 bof the clamping device 16 a, 16 b.The at least one cylinder head drill 12 has in a zero position a distance of more than 3 mm from a zero plane, in which an untreated surface 19 eof the furniture panel 3 acan be arranged. In this way, the risk of long chips becoming jammed is reduced.FIG. 6 bshows a side view of the hinge drilling jig 10 with the clamping lever 15 in the clamping position, in which access to the rotary drive 18 aof the cylinder head drill 12 is possible.The clamping lever 15 which can be pivoted about the axis of rotation 37 (FIG. 6 a) can finally fix the clamping position, with the result that the cylindrical recess 7 can be drilled by driving the rotary drive 18 aby means of the hand-held drilling machine 31.The energy store 38 is schematically indicated, which applies a force to the clamping bracket 35 in the direction of a position clamping the furniture panel 3 apre.FIGS. 7 a- 7 c show different views of a cylinder head drill 12 for a hinge drilling jig 10 for producing a drilling pattern for hinges 4 in a furniture panel 3 a.FIG. 7 ashows a view of a cylinder head drill 12 and a chipbreaker 14 arranged or arrangeable on the cylinder head drill 12.The cylinder head drill 12 includes:at least one shank 40 rotatable about an axis of rotation 39 for clamping the cylinder head drill 12 into the hinge drilling jig 10,at least one cutting head 41 with at least one front-side main cutting edge 13 for producing a cylindrical recess 7 in the furniture panel 3 a,at least one chipbreaker 14 for crushing chip material produced, wherein the at least one chipbreaker 14 is designed at least in regions conically in order to urge the chip material to be crushed starting from the axis of rotation 39 in a direction pointing away from the axis of rotation 39.The conical or frustoconical shape of the chipbreaker 14 is designed to transport the chip material that arises obliquely outwards starting from the axis of rotation 39 when drilling the cylindrical recess 7, wherein the displaced chip material can be comminuted by a plurality of cutting edges 43 of the rotating chipbreaker 14.According to one exemplary embodiment, the at least one chipbreaker 14 is substantially crown-shaped.The at least one chipbreaker 14 can have at least one, preferably circular, opening 44 for receiving the shank 40.According to one exemplary embodiment, the at least one chipbreaker 14 is designed as a component which is separate from the cylinder head drill 12 and is firmly connected, preferably adhesively bonded, welded or pressed, to the cylinder head drill 12.Alternatively, it is possible to connect the chipbreaker 14 and the cylinder head drill 12 to one another in a releasable manner via at least one form-fit connection. In a connected state, the chipbreaker 14 is connected to the cylinder head drill 12 in a rotationally fixed manner via the positive connection. In the event of possible damage or wear, the chipbreaker 14 can be replaced without problems.Alternatively, it is possible for the at least one chipbreaker 14 to be formed integrally together with the cylinder head drill 12.The at least one chipbreaker 14 can have at least one, preferably trough-shaped and / or conically tapering, discharge channel 45 for discharging chip material.Preferably, a plurality of, preferably trough-shaped and / or conically tapering, discharge channels 45 are provided for discharging chip material.In the exemplary embodiment shown, the discharge ducts 45 are substantially semi-elliptical in a plan view and / or are uniformly distributed over the conical or frustoconical circumferential surface of the at least one chipbreaker 14.Between two adjacent discharge channels 45 at least one cutting surface 43 for crushing the chip material can be arranged.In the exemplary embodiment shown, the at least one chipbreaker 14 has twelve discharge ducts 45 and / or twelve cutting surfaces 43.According to a possible embodiment, the discharge channels 45 can taper conically, preferably within an angular range between 20° and 30°.The cylinder head drill 12 can have at least one, preferably lateral and / or web-shaped, cutting surface 46 for crushing the chip material and / or at least one centering tip 42 for centering the cylinder head drill 12 on the furniture panel 3 a.The longitudinal direction of the cutting surface 46 may be substantially parallel to the rotational axis 39 of the cylinder head drill 12.In the exemplary embodiment shown, the cylinder head drill 12 has, in addition to the at least one main cutting edge 13, at least one further, preferably point-shaped, end-face cutting edge 47.FIG. 7 bshows the chipbreaker 14 arranged on the cylinder head drill 12, wherein the chipbreaker 14 is arranged behind the cutting head 41 in a feed direction of the cylinder head drill 12.FIG. 7 cshows the chipbreaker 14 arranged on the cylinder head drill 12 in a cross section.According to a preferred embodiment, a largest diameter of the at least one chipbreaker 14 is smaller than the smallest diameter of the at least one cutting head 41. In this way, it is ensured that the material of the furniture panel 3 ais removed, preferably exclusively, by the cutting head 41 and not by the chipbreaker 14.The conical or frustoconical chipbreaker 14 has two base surfaces of different size spaced apart from one another along the axis of rotation 39, a larger base surface of the chipbreaker 14 being at a greater distance from the cutting head 41 than the smaller base surface.The at least one chipbreaker 14 is arranged on the shank 40 adjacent to the cutting head 41 and / or is placed on the cutting head 41.A cone angle of the at least one chipbreaker 14 can be between 50° and 90°, preferably between 70° and 80°.A length of the at least one chipbreaker 14 measured in the direction of the axis of rotation 39 can be less than or equal to the greatest length of the cutting head 41 that occurs.FIG. 8 ashows the cylinder head drill 12 in an assembled position in a cross section. The cutting head 41 can have a centering tip 42, at least one front-side main cutting edge 13 and a front-side cutting edge 47.The conical or frustoconical cutting breaker 14 is arranged behind the cutting head 41 in the feed direction of the cylinder head drill 12 and has a plurality of discharge ducts 45 distributed over the lateral surface of the cutting breaker 14 for discharging the chip material and / or a plurality of cutting surfaces 46 distributed over the conical lateral surface of the cutting breaker 14 for crushing the chip material.The two dowel drills 20 make it possible to produce the dowel bores 8a, 8b (FIG. 1b) for receiving dowels of the hinge 4.FIG. 8 bshows the cylinder head drill 12 with the chipbreaker 14 in a view from below. The base body 11 of the hinge drilling jig 10 has at least one counter surface 48 and / or constriction 49, which is arranged adjacent to the cylinder head drill 12 and to which the chip material to be comminuted can be urged via the at least one chip breaker 14.The chipbreaker 14 can reduce the amount of chip material that arises, so that jamming of long chips between the cylinder head drill 12, the dowel drills 20 and the furniture panel 3 aand thus the risk of damage to a surface 19 eof the furniture panel 3 ais reduced.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 3315539 A1

[0004]

Claims

Cylinder head drill (12) for a hinge drilling jig (10) for producing a drilling pattern for hinges (4) in a furniture panel (3a), comprising: - at least one shank (40) rotatable about an axis of rotation (39) for clamping the cylinder head drill (12) into the hinge drilling jig (10), - at least one cutting head (41) having at least one main cutting edge (13) on the end side for producing a cylindrical recess (7) in the furniture panel (3a), - at least one chip breaker (14) for crushing chip material produced, characterized in that the at least one chip breaker (14) is designed conically at least in regions in order to urge the chip material to be crushed starting from the axis of rotation (39) in a direction pointing away from the axis of rotation (39).Cylinder head drill (12) according to claim 1, wherein the at least one chipbreaker (14) is substantially crown-shaped.Cylinder head drill (12) according to Claim 1 or 2, wherein the at least one chipbreaker (14) is designed as a component which is separate from the cylinder head drill (12) and is firmly connected, preferably adhesively bonded, welded or pressed, to the cylinder head drill (12).Cylinder head drill (12) according to claim 1 or 2, wherein the at least one chipbreaker (14) is formed integrally with the cylinder head drill (12).The cylinder head drill (12) according to any one of claims 1 to 4, wherein a largest diameter of the at least one chipbreaker (14) is smaller than the smallest diameter of the at least one cutting head (41).Cylinder head drill (12) according to one of claims 1 to 5, wherein a cone angle of the at least one chipbreaker (14) is between 50° and 90°, preferably between 70° and 80°.Cylinder head drill (12) according to one of claims 1 to 6, wherein the at least one chipbreaker (14) has at least one, preferably trough-shaped and / or conically tapering, discharge channel (45) for discharging chip material.Cylinder head drill (12) according to claim 7, wherein a plurality of, preferably trough-shaped and / or conically tapering, discharge channels (45) are provided for discharging chip material, preferably wherein the discharge channels (45) are uniformly distributed over the conical circumferential surface of the at least one chipbreaker (14) and / or wherein at least one cutting surface (46) for crushing the chip material is arranged between two adjacent discharge channels (45).Cylinder head drill (12) according to one of claims 1 to 8, wherein the at least one chipbreaker (14) has two base surfaces of different size spaced apart from one another in the longitudinal direction of the chipbreaker (14), wherein a larger base surface of the chipbreaker (14) is at a greater distance from the cutting head (41) than the smaller base surface.Cylinder head drill (12) according to one of claims 1 to 9, wherein the at least one chipbreaker (14) is arranged on the shank (40) adjacent to the cutting head (41) and / or is placed on the cutting head (41).Cylinder head drill (12) according to one of claims 1 to 10, wherein the cylinder head drill (12) has at least one, preferably lateral and / or web-shaped, cutting surface (46) for crushing the chip material and / or at least one centering tip (42) for centering the cylinder head drill (12) on the furniture panel (3a).Hinge drilling jig (10) for producing a drilling pattern for hinges (4) in a furniture panel (3a), having at least one cylinder head drill (12) according to one of Claims 1 to 11 for producing a cylindrical recess (7) for receiving a hinge cup (6) in the furniture panel (3a).The hinge drilling jig (10) according to claim 12, wherein the hinge drilling jig (10) comprises at least one base body (11), wherein the at least one base body (11) comprises a counter surface (48) and / or constriction (49), which is arranged adjacent to the cylinder head drill (12) and to which the chip material to be comminuted can be urged via the at least one chip breaker (14).Hinge drilling jig (10) according to claim 12 or 13, wherein the at least one cylinder head drill (12) in a zero position has a distance of more than 3 mm from a zero plane, in which an untreated surface (19e) of the furniture panel (3a) can be arranged.The hinge drilling jig (10) according to any one of claims 12 to 14, wherein the hinge drilling jig (10) comprises, in addition to the cylinder head drill (12), at least one dowel drill (20), preferably two dowel drills (20), preferably wherein the at least one cylinder head drill (12) and the at least one dowel drill (20) are offset with respect to each other in the height direction, preferably by about 3 mm.

Images