# US 12,025,167 B2 · System for securing an anchor in a mineral substrate > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,025,167 B2 - Document ID: US12025167B2 - Status: Granted - Kind: B2 - Application number: 17/632,010 - Filed: 2020-07-31 - Published: 2022-09-22 - Granted: 2024-07-02 - Earliest claimed: 2019-08-08 - Assignees: Ludwig Hettich Holding GmbH & Co. KG - Applicants: Ludwig Hettich Holding Gmbh & Co. KG - Inventors: Andreas Heck; Ulrich Hettich - Web page: https://patentgrep.com/patent/US12025167B2 ## CPC - F16B 25/0026: {the material being a hard non-organic material, e.g. stone, concrete or drywall (F16B25/0031 takes precedence)} - B23G 1/16: in holes of workpieces by taps (B23G1/26, B23G1/32, B23G1/36 take precedence) - B28D 1/146: {Tools therefor (drill bits for earth or rock drilling E21B10/00)} - B28D 1/186: {Tools therefor, e.g. having exchangeable cutter bits (B28D1/181 takes precedence; bits for picks or pick-holders for mining or quarrying E21C35/18)} - E04B 1/4157: {Longitudinally-externally threaded elements extending from the concrete or masonry, e.g. anchoring bolt with embedded head} - F16B 25/0042: {characterised by the geometry of the thread, the thread being a ridge wrapped around the shaft of the screw} - F16B 25/0052: {the ridge having indentations, notches or the like in order to improve the cutting behaviour} - F16B 25/0094: {the screw being assembled or manufactured from several components, e.g. a tip out of a first material welded to shaft of a second material} - B23G 2200/46: Tools having a section of polygonal form, e.g. for the transmission of torque - B23G 2210/04: Internal threads - F16B 25/00: Screws that cut thread in the body into which they are screwed, e.g. wood screws {(F16B35/065 takes precedence; joining sheets or plates using screws with two separate threads F16B5/0275, using screws with adjustment sleeves F16B5/0283)} - F16B: DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING (couplings for transmitting rotation F16D) - B23G: THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH (making helical grooves by turning B23B5/48, by milling B23C3/32, by forging, pressing, or hammering B21K1/56, by grinding B24B19/02; arrangements for copying or controlling B23Q; thread-forming by corrugating tubes B21D15/04, by rolling B21H3/02) - B28D: WORKING STONE OR STONE-LIKE MATERIALS - E04B: GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS (border constructions of opening in walls, floors or ceilings E06B1/00; {electromagnetic shielding H05K9/0001}) ## Abstract The invention relates to a system for securing an anchor in a borehole in a mineral substrate, in particular concrete, mortar, or brickwork, comprising an anchor with a core section and a threaded section and comprising a furrowing tool for furrowing an internal thread in the borehole, wherein the furrowing tool comprises the following: a main part with a leading end and a trailing end, said main part having an outer surface on which a furrowing thread is formed that is suitable for furrowing the internal thread into the wall of the borehole. The outer surface of the main part is equipped with a plurality of elevations, each of which has a cutting edge, and all of the cutting edges lie at least partly on an imaginary cylinder with a diameter (do). The cutting edges are suitable for at least partially removing the inner wall of the borehole when the furrowing tool is rotated into the borehole in order to adapt the internal wall of the borehole to the imaginary cylinder. ## Claims ### Claim 1 A system for fastening an anchor in a borehole in a mineral substrate, in particular concrete, mortar or masonry, comprising an anchor having a core section and a thread section, the core section having a core diameter dK and the thread section having an outer diameter dG, and a grooving tool, different from said anchor, for grooving an internal thread in the borehole, the grooving tool comprising the following: a base body having a leading and a trailing end, a force application device being provided, via which a torque for screwing the grooving tool into the borehole and for grooving the thread is transmitted to the base body, the base body having an outer surface on which a grooving thread is formed, which is suitable for grooving the internal thread into the wall of the borehole, characterized in that a plurality of elevations are formed on the outer surface of the base body, each having a cutting edge, wherein at least a section of all cutting edges lie on an imaginary cylinder having a diameter do, and wherein the cutting edges are suitable to at least partially remove the inner wall of the borehole when screwing the grooving tool into the borehole in order to adapt the inner wall of the borehole to the imaginary cylinder. ### Claim 2 (depends on 1) The system according to claim 1, wherein the cutting edge is formed by an edge on which a substantially radial surface inclined by less than 30° with respect to the radial direction, and a substantially tangential surface inclined by at least 45° with respect to the radial direction, meet one another, wherein the surface normal of the substantially radial surface points in the screwing-in direction. ### Claim 3 (depends on 1) The system according to claim 1, wherein the grooving tool has at least four of said elevations with associated cutting edge. ### Claim 4 (depends on 1) The system according to claim 1, wherein the anchor is produced with a manufacturing tolerance of less than 0.2·(db)0.3 mm with respect to the core diameter dK, the grooving tool is produced with a manufacturing tolerance of less than 0.1·(db)0.3 mm with respect to the diameter d0, wherein db is the numerical value of the nominal diameter of the borehole in millimeters, and wherein the following applies: 0.0 mm≤(dF−dG)/dK≤0.15. ### Claim 5 (depends on 1) The system according to claim 1, wherein the anchor is produced with a manufacturing tolerance of less than 0.2·(db)0.3 mm in relation to the outer diameter dG of its thread, the grooving tool is produced with a manufacturing tolerance of less than 0.2·(db)0.3 mm in relation to the maximum outer diameter dF of its grooving thread, wherein db is the numerical value of the nominal diameter of the borehole in millimeters, and wherein the following applies: 0.0≤(dF−dG)/dK≤0.15. ### Claim 6 (depends on 1) The system according to claim 1, wherein the grooving thread has a plurality of turns, and the plurality of elevations are arranged between turns of the grooving thread. ### Claim 7 (depends on 1) The system according to claim 1, wherein the grooving thread has fewer than four turns. ### Claim 8 (depends on 1) The system according to claim 1, wherein the grooving tool has an annular wiping element suitable for wiping drill dust from the borehole wall. ### Claim 9 (depends on 1) The system according to claim 1, wherein the outer diameter of the grooving thread decreases in the direction of the leading end, and wherein recesses are formed in the grooving thread and incisors are formed between adjacent recesses. ### Claim 10 (depends on 1) The system according to claim 1, wherein the grooving tool, at least, however, its grooving thread and the elevations, have a Rockwell hardness of at least 55 HRC. ### Claim 11 (depends on 1) The system according to claim 1, wherein the grooving tool, at least, however, the grooving thread and the elevations, consist of an alloyed steel, tool steel, stellite, a ceramic material or a hard metal. ### Claim 12 (depends on 1) The system according to claim 1, wherein the grooving tool has a drive element at its leading end, which is suitable to interact with a force application device of the anchor or a part of the same, which is to be screwed into the borehole treated with the grooving tool. ### Claim 13 (depends on 12) The system according to claim 12, in which the drive element is a polygonal drive or a hexalobal drive. ### Claim 14 (depends on 12) The system according to claim 12, in which the drive element of the grooving tool and the force application device of the anchor are adapted to one another such that they can assume an engagement position, and in this engagement position the relative orientation of the grooving tool and the anchor or said part of the same is predetermined such that the grooving thread lies on an imaginary continuation of the thread of the anchor, when the grooving tool is rotated in the screwing-in direction, a torque can be transmitted from its drive element to the force application device of the anchor or part of the same, and when the grooving tool is rotated counter to the screwing-in direction, no torque can be transmitted from its drive element to the force application device of the anchor or the part of the same. ### Claim 15 (depends on 1) The system according to claim 1, in which the anchor is formed by a threaded sleeve having an external thread forming said thread section, wherein the threaded sleeve has an internal thread, in particular a metric internal thread, or wherein the threaded sleeve is wound from a profile strip having a radially inner and a radially outer side, wherein a thread ridge is formed on the radially outer side, which thread ridge is suitable to be screwed into the internal thread in the borehole grooved with the aid of the grooving tool. ### Claim 16 (depends on 1) The system according to claim 1, in which the anchor is formed in at least two parts and comprises the following: a spiral coil which can be screwed into the internal thread in the borehole grooved with the aid of the grooving tool, wherein the spiral coil is formed by a wound profile strip having a radially inner and a radially outer side, wherein a thread ridge is formed on the radially outer side, which thread ridge is suitable for being screwed into the internal thread in the borehole grooved with the aid of the grooving tool, and a screw or threaded rod having an external thread suitable to be screwed into the spiral coil. ### Claim 17 (depends on 1) The system according to claim 1, the following applying to the ratio of the length heff of the thread section of the anchor and the nominal diameter db of the borehole: heff/db≥15.0. ### Claim 18 A method for fastening an anchor having a core section and a thread section in a borehole in a mineral substrate, comprising the following steps: drilling a borehole, grooving an internal thread in the borehole by screwing a grooving tool into the borehole, and inserting the anchor into the borehole, the grooving tool comprising the following: a base body having a leading and a trailing end, a force application device being provided via which a torque for screwing the grooving tool into the borehole and for grooving the thread is transferred to the base body, the base body having an outer surface on which a grooving thread is formed, which is suitable for grooving the inner thread into the wall of the borehole, characterized in that a plurality of elevations are formed on the outer surface of the base body of the grooving tool, each having a cutting edge , wherein all cutting edges lie on an imaginary cylinder having a diameter d0, wherein the inner wall of the borehole is at least partially removed with the aid of the cutting edges when the grooving tool is screwed into the borehole, in order to adapt the inner wall of the borehole to the imaginary cylinder. ### Claim 19 (depends on 18) The method according to claim 18, wherein the anchor has a core diameter dK, and wherein the following applies: 0.0 mm≤d0−dK≤0.7 mm. ### Claim 20 (depends on 18) The method according to claim 18, wherein the anchor has a core diameter dK, the thread of the anchor has an outer diameter dG, and the grooving thread of the grooving tool has a maximum diameter dF, and wherein the following applies: 0.0≤(dF−dG)/dK≤0.15. ### Claim 21 (depends on 18) The method according to claim 18, wherein the grooving tool has an annular wiping element, wherein drill dust is wiped from the borehole wall with the aid of the annular wiping element when the grooving tool is screwed in and/or unscrewed. ### Claim 22 (depends on 18) The method according to claim 18, wherein the grooving tool at its leading end has a drive element suitable for interacting with a force application device of the anchor or of a part of the same, and with the aid of which the anchor or the part of the same is screwed into the borehole treated with the grooving tool. ### Claim 23 (depends on 22) The method according to claim 22, wherein the drive element is a polygon or a hexalobe drive. ### Claim 24 (depends on 22) The method according to claim 22, wherein inserting the anchor into the borehole comprises the following steps: bringing the drive element of the grooving tool and the force application device of the anchor or the part of the same into an engagement position in which the relative orientation of the grooving tool and the anchor or said part of the same is predetermined such that the grooving thread lies on an imaginary continuation of the thread of the anchor, rotating the grooving tool in the screwing-in direction, wherein a torque is transmitted from its drive element to the force application device of the anchor or the part of the same in order to screw the anchor or the part of the same into the borehole until the anchor or part of the anchor is located completely and the grooving tool is at least partially located in the borehole, rotating the grooving tool counter to the screwing-in direction in order to screw it out of the borehole, wherein it does not transmit any torque from its drive element to the force application device of the anchor or of the part thereof. ### Claim 25 (depends on 18) The method according to claim 18, in which the anchor is formed in at least two parts and comprises the following: a spiral coil which can be screwed into the internal thread in the borehole grooved with the aid of the grooving tool, wherein the spiral coil is formed by a wound profile strip having a radially inner and a radially outer side, wherein a thread ridge is formed on the radially outer side, which thread ridge is suitable for being screwed into the internal thread in the borehole grooved with the aid of the grooving tool, and a screw or threaded rod having an external thread which can be screwed into the spiral coil, and wherein said insertion of the anchor into the borehole comprises the following: screwing the spiral coil into the internal thread in the borehole that has been grooved with the aid of the grooving tool, and screwing the screw or threaded rod into the spiral coil. ### Claim 26 (depends on 18) The method according to claim 18, wherein the anchor is inserted into the borehole with an effective anchoring depth heff, wherein the following applies to the ratio of the effective anchoring depth heff and the nominal diameter db of the borehole: heff/db≥15.0. ### Claim 27 (depends on 18) The method of claim 18, wherein said anchor is fastened in said borehole for reinforcing said mineral substrate, or for forming an overlap jointin said mineral substrate. ### Claim 28 A grooving tool for grooving an internal thread in a borehole formed in a mineral substrate, the grooving tool comprising the following: a base body having a leading and a trailing end, a force application device being provided, via which a torque for screwing the grooving tool into the borehole and for grooving the thread is transmitted to the base body, the base body having an outer surface on which a grooving thread is formed, which is suitable for grooving the internal thread into the wall of the borehole, characterized in that a plurality of elevations are formed on the outer surface of the base body, each having a cutting edge, wherein at least a section of all cutting edges lie on an imaginary cylinder, and wherein the cutting edges are suitable to at least partially remove the inner wall of the borehole when screwing the grooving tool into the borehole in order to adapt the inner wall of the borehole to the imaginary cylinder, wherein the force application device has a diameter larger than the diameter of the imaginary cylinder. ### Claim 29 (depends on 28) The grooving tool according to claim 28, wherein the grooving tool has a drive element at its leading end, which is suitable to interact with a force application device of an anchor or a part of the same, which is to be screwed into the borehole treated with the grooving tool, wherein the drive element is preferably a polygonal drive or a hexalobal drive.