# US 11,028,871 B2 · Plastic nut, fastening system and fastening method > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,028,871 B2 - Document ID: US11028871B2 - Status: Granted - Kind: B2 - Application number: 16/368,079 - Filed: 2019-03-28 - Published: 2019-10-03 - Granted: 2021-06-08 - Earliest claimed: 2018-03-28 - Assignees: Newfrey LLC - Applicants: Newfrey LLC - Inventors: Markus Kumpf; Frank Rosemann - Web page: https://patentgrep.com/patent/US11028871B2 ## CPC - F16B 37/005: {into which threads are cut during screwing} - F16B 5/02: by means of fastening members using screw-thread ({F16B5/0004 takes precedence}; construction of screw-threaded connections F16B25/00 - F16B39/00) - F16B 5/0241: {with the possibility for the connection to absorb deformation, e.g. thermal or vibrational} - F16B 33/006: {Non-metallic fasteners using screw-thread} - F16B 39/282: Locking by means of special shape of work-engaging surfaces, e.g. notched or toothed nuts - F16B 39/284: Locking by means of elastic deformation ({F16B39/2825, F16B39/36,} F16B39/38 take precedence) - 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) ## Abstract A plastic nut for multiple detachable fastening onto a stud with a thread protruding from a workpiece includes a base body with an inner surface partially defining a cylindrical recess penetrating the base body. A support surface is attached to the base body at an axial end of the plastic nut. A clamping device is attached to the plastic nut and configured to provide a clamping force between the plastic nut and the stud when the stud is installed in the cylindrical recess. ## Claims ### Claim 1 A plastic nut (10) for multiple detachable fastening onto a stud (12) with a thread protruding from a workpiece (20), the plastic nut comprising: a base body (14) including an inner surface partially defining a cylindrical recess (16) penetrating the base body (14); a support surface (18) attached to the base body at a first axial end, the support surface including a repeating saw tooth (36) profile; and a clamping device (22), which is configured to provide a clamping force between the plastic nut (10) and the stud (12) when the stud is installed in the cylindrical recess, is attached to the base body at second axial end opposite to the first axial end and the clamping device (22) includes a radially elastic hollow cylinder section (28), which is arranged concentrically to the cylindrical recess (16), and further includes an elastic clamping nose (26), which extends radial into a cross section matching the cross section of the cylindrical recess (16). ### Claim 2 (depends on 1) The plastic nut (10) according to claim 1, wherein the clamping device (22) is located at a second end (24) of the base body (14), and the second end (24) is opposite to the support surface (18). ### Claim 3 (depends on 1) The plastic nut (10) according to claim 1, wherein the hollow cylinder section (28) comprises a deformable area (32) at an inner surface (30) in which a thread can be formed by the stud (12). ### Claim 4 (depends on 1) The plastic nut (10) according to claim 1, wherein the plastic nut (10) is an integral injection-molded part. ### Claim 5 (depends on 1) The plastic nut (10) according to claim 1, wherein a ratio of an average wall thickness (A, A′) of a stem portion of the plastic nut (10) to an average wall thickness (B, B′) of the hollow cylinder section (28) is smaller than 20 and larger than 1. ### Claim 6 (depends on 1) The plastic nut (10) according to claim 1, wherein a ratio of an axial length (D) of a stem portion of the plastic nut (10) to an axial length (E′) of the hollow cylinder section (28) is smaller than 10 and larger than 1. ### Claim 7 A fastening system for connecting to a workpiece, the fastening system comprising: a stud (12), including a flange section (48) and a stem section (50), the stem section (50) extending axially from a first side of the flange section (48) and includes a stud thread (52), and a second side of the flange section (48) that faces away from the stem section (50) is a joining side (54) for joining the stud (12) onto the workpiece (20), and a plastic nut (10) including: a base body (14) including an inner surface partially defining a cylindrical recess (16) penetrating the base body (14); a support surface (18) attached to the base body at a first axial end, the support surface including a repeating saw tooth (36) profile; and a clamping device (22), which is configured to provide a clamping force between the plastic nut (10) and the stud (12) when the stud is installed in the cylindrical recess, is attached to the base body at second axial end opposite to the first axial end and the clamping device (22) includes a radially elastic hollow cylinder section (28), which is arranged concentrically to the cylindrical recess (16), and further includes an elastic clamping nose (26), which extends radial into a cross section matching the cross section of the cylindrical recess (16). ### Claim 8 A method for fastening an object (56) partially defining a through opening (58), with respect to a stud (12) which is joined to a workpiece (20), with a fastening system, the method comprising the following steps: providing a fastening system for connecting to a workpiece, the fastening system comprising: a stud (12), including a flange section (48) and a stem section (50), the stem section (50) extending axially from a first side of the flange section (48) and including a stud thread (52), and a second side of the flange section (48) that faces away from the stem section (50) is a joining side (54) for joining the stud (12) onto the workpiece (20); a plastic nut (10) including: a base body (14) including an inner surface partially defining a cylindrical recess (16) penetrating the base body (14); a support surface (18) attached to the base body at a first axial end, the support surface including a repeating saw tooth (36) profile; and a clamping device (22), which is configured to provide a clamping force between the plastic nut (10) and the stud (12) when the stud is installed in the cylindrical recess, is attached to the base body at second axial end opposite to the first axial end and the clamping device (22) includes a radially elastic hollow cylinder section (28), which is arranged concentrically to the cylindrical recess (16), and further includes an elastic clamping nose (26), which extends radial into a cross section matching the cross section of the cylindrical recess (16); arranging the object (56) on the workpiece (20) with the stud (12) protruding through the opening (58); and placing the plastic nut (10) onto the stud (12) and screwing the plastic nut (10) down onto the stud until the support surface (18) of the plastic nut (10) touches an upper surface of the object (56). ### Claim 9 (depends on 1) A plastic nut according to claim 1, wherein the saw-tooth profile (36) comprises a repeating pattern of a raised portion (38), and the raised portion 38 includes a short steep flank (40) and a long flatter flank (42). ### Claim 10 (depends on 9) A plastic nut according to claim 9, wherein the raised portions (38) curve in a clockwise direction as they extend radially outward over the support surface (18). ### Claim 11 (depends on 9) A plastic nut according to claim 9, wherein the short steep flank (40) defines a steep slope angle of more than 70° relative to a plane of the support surface, and the long flatter flank (42) defines a shallow slope angle of no more than 40° relative to the plane. ### Claim 12 (depends on 1) A plastic nut according to claim 1, wherein the clamping nose (26) is a first clamping nose, and clamping device further includes a second camping nose.