# US 8,770,940 B2 · Blade section for a wind turbine blade > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,770,940 B2 - Document ID: US8770940B2 - Status: Granted - Kind: B2 - Application number: 13/059,866 - Filed: 2009-08-21 - Published: 2011-07-07 - Granted: 2014-07-08 - Earliest claimed: 2008-08-21 - Assignees: Lm Glasfiber A/S - Applicants: Rajkumar Rajamani - Inventors: Rajkumar Rajamani - Web page: https://patentgrep.com/patent/US8770940B2 ## CPC - F03D 1/0675: {of the blades} - F05B 2240/302: Segmented or sectional blades - Y02E 10/72: Wind turbines with rotation axis in wind direction - Y10T 29/49321: Assembling individual fluid flow interacting members, e.g., blades, vanes, buckets, on rotary support member - F03D: WIND MOTORS - F05B: INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G - Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A blade section for a wind turbine blade, the blade section extending along a longitudinal axis and having at least a first end, the blade section comprising a main blade section with a contour having an outer surface. The main blade section at the first end is provided with a number of connection elements, each connection element being pivotally engaged with the main blade section about a rotational axis. Each of the connection elements being provided with a joining means for anchoring each of the connection element to another blade section. The joining means of each of the number of connection elements is arranged in a distance from the rotational axis. ## Claims ### Claim 1 A blade section (31, 32) for a wind turbine blade, the blade section (31, 32) extending along a longitudinal axis (L) and having at least a first end (35, 36), the blade section (31, 32) comprising a main blade section (33, 34) with a contour having an outer surface, wherein the main blade section (33, 34) at the first end (35, 36) is provided with a number of connection elements (40, 50), characterised in that each of the number of connection elements (40, 50) being pivotally engaged with the main blade section (33, 34) about a rotational axis (55), and each of the number of connection elements (40, 50) being provided with a joining means (42, 46, 52) for anchoring each of the number of connection elements (40, 50) to another blade section (31, 32), wherein the joining means (42, 46, 52) of each of the number of connection elements (40, 50) is arranged in a distance from the rotational axis (55). ### Claim 2 (depends on 1) A blade section according to claim 1, wherein each of the number of connection elements (40, 50) comprises a first outer surface part (43, 53), which in a first pivotal position flushes with at least a part of the outer surface of the main blade section (33, 34). ### Claim 3 (depends on 2) A blade section according to claim 2, wherein the first outer surface part (43, 53) of each of the number of connection elements (40, 50) in the first pivotal position abuts at least a part of the outer surface of the main blade section (33, 34). ### Claim 4 (depends on 1) A blade section according to claim 1, wherein the main blade section (33, 34) comprises a number of juxtaposed connection elements (40, 40′). ### Claim 5 (depends on 2) A blade section according to claim 2, wherein the first outer surface part (43, 43′) of each of the number of connection elements (40, 40′) in the first pivotal position flushes with the first outer surface part of at least one juxtaposed connection element (40, 40′). ### Claim 6 (depends on 2) A blade section according to claim 2, wherein the first outer surface part (43, 43′) of each of the number of connection elements (40, 50) in the first pivotal position abuts the first outer surface part of at least one juxtaposed connection element (40, 40′). ### Claim 7 (depends on 1) A blade section according to claim 1, wherein at least one of the number of connection elements (40, 50) is pivotally engaged with the main blade section (33, 34) by means of a shaft (39) extending from the first end (35) of the main blade section (33, 34) via a bore (41, 51) in the connection element (40, 50). ### Claim 8 (depends on 1) A blade section according to any of claim 1, wherein at least one connection element is engaged with a bore in the first end of the main blade section by means of a shaft extending from the connection element. ### Claim 9 (depends on 1) A blade section according to any of claim 1, wherein the rotational axis (55) of at least one connection element (40, 50) is substantially parallel to the longitudinal axis (L). ### Claim 10 (depends on 1) A wind turbine blade (25) comprising at least a first blade section (31) and a second blade section (32) according to claim 1, wherein the rotational axis (55) of each of the number of connection elements (40, 50) of the first blade section (31, 32) and the rotational axis (55) of each of the number of connection elements (40,50) of the second blade (31, 32) section are pairwise aligned. ### Claim 11 (depends on 10) A wind turbine blade according to claim 10, wherein the joining means (42, 46, 52) of each of the number of connection elements (40, 50) of the first blade section (31, 32) and the joining means (42, 46, 52) of each of the number of connection elements of the second blade section (31, 32) are pairwise rigidly anchored to form a number of pairwise rigidly anchored connection elements. ### Claim 12 (depends on 10) A wind turbine blade according to claim 10, wherein each of the number of the pairwise rigidly anchored connection elements in the first pivotal position are fixed by a fastening means (60) to at least one juxtaposed pairwise rigidly anchored connection element. ### Claim 13 (depends on 10) A method for assembling a wind turbine blade (30) according to claim 10, wherein the method comprises the following steps: a) aligning the first blade section (31, 32) and the second blade section (31, 32) in the longitudinal direction (L), so at least one of the first connection elements and at least one of the second connection elements has a common rotational axis (55), b) pairwise rigidly anchoring the number of first connection elements (40, 50) of the first blade section (31, 32) to the number of second connection elements (40, 50) of the second blade section (31, 32) via the joining means (42, 46, 52), and c) pivoting each of the number of the pairwise rigidly anchored connection elements to the first pivotal position. ### Claim 14 (depends on 13) A method according to claim 13, wherein the joining means (42, 46, 52) in step b) comprises nut and bolt means, adhesion, gluing or welding. ### Claim 15 (depends on 13) A method according to claim 13, wherein the method further comprises a step, wherein the pairwise rigidly anchored connection elements are fixed by a fastening means (60) to at least one juxtaposed pairwise rigidly anchored connection elements.