# US 11,299,888 B2 · Long structural member and structural member complex using same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,299,888 B2 - Document ID: US11299888B2 - Status: Granted - Kind: B2 - Application number: 15/303,421 - Filed: 2015-04-13 - Published: 2017-02-02 - Granted: 2022-04-12 - Earliest claimed: 2014-04-14 - Assignees: Mitsubishi Chemical Corporation - Applicants: Mitsubishi Rayon Co., Ltd. - Inventors: Takeshi Ishikawa - Web page: https://patentgrep.com/patent/US11299888B2 ## CPC - E04C 3/28: of materials not covered by groups E04C3/04 - E04C3/20 - B62D 25/00: Superstructure {or monocoque structure} sub-units; Parts or details thereof not otherwise provided for {(having impact absorbing means B62D21/15; running-boards, steps, or the like as superstructure sub-unit B60R3/00)} - B62D 25/025: {Side sills thereof} - B62D 25/08: Front or rear portions {(sub-frames for mounting engine or suspensions B62D21/11)} - B62D 29/04: predominantly of synthetic material (working of plastics or substances in a plastic state B29) - E04C: STRUCTURAL ELEMENTS; BUILDING MATERIALS (for bridges E01D; specially designed for insulation or other protection E04B; elements used as building aids E04G; for mining E21; for tunnels E21D; structural elements with broader range of application than for building engineering F16, particularly F16S) - B62D: MOTOR VEHICLES; TRAILERS (steering, or guiding on a desired track, of agricultural machines or implements A01B69/00; wheels, castors, axles, increasing wheel adhesion B60B; vehicle tyres, tyre inflation or tyre changing B60C; connections between vehicles of a train or the like B60D; vehicles for use on rail and road, amphibious or convertible vehicles B60F; suspension arrangements B60G; heating, cooling, ventilating or other air treating devices B60H; windows, windscreens, non-fixed roofs, doors or similar devices, protective coverings for vehicles not in use B60J; propulsion plant arrangements, auxiliary drives, transmissions, controls, instrumentation or dashboards B60K; electric equipment or propulsion of electrically-propelled vehicles B60L; power supply for electrically-propelled vehicles B60M; passenger accommodation not otherwise provided for B60N; adaptations for load transportation or to carry special loads or objects B60P; arrangement of signalling or lighting devices, the mounting or supporting thereof or circuits therefor, for vehicles in general B60Q; vehicles, vehicle fittings or vehicle parts not otherwise provided for B60R; servicing, cleaning, repairing, supporting, lifting, or manoeuvring, not otherwise provided for, B60S; brake arrangements, brake control systems or parts thereof B60T; air-cushion vehicles B60V; motor-cycles, accessories therefor B62J, B62K; testing of vehicles G01M) ## Abstract A long structural member and a structural member complex that contain a fiber-reinforced resin having a simple reinforced structure, suppressing increase in molded article weight, and exhibiting high mechanical properties. The long structural member has a perpendicular cross-section formed in a U shape, has two of the corners on the inside of the U-shaped section reinforced by the fiber-reinforced resin, and has a triangular cross-section for each of the cross-sections of the two corners inside the reinforced U-shaped section. ## Claims ### Claim 1 A structural member complex, comprising a first structural member and a second structural member each of the first and second structural members comprise a hat channel structure with U-shaped longitudinal cross-section comprising two opposed upright faces each face having an inner surface, an outer surface, an upper end portion and a bottom end portion and each of the two opposed upright faces are connected by the bottom end portion opposite of the upper end portion wherein corners are formed at each of the intersections of the bottom end portion that connects the two upright faces, and flanges, wherein the two opposed upright faces are not connected at any portion other than at the corners formed at each intersection of the bottom end portion that connects the two upright faces, and wherein the corners inside the U-shaped portion are reinforced by fiber reinforcement resin and a cross-section of each of two corners inside the reinforced U-shaped portion is a triangular cross-section satisfying the following equations: 0.05≤W/W0≤0.15 0.15≤W/H0≤0.36, wherein W0 indicates an outer face length of a bottom face portion of the U-shaped portion of the longitudinal cross-section, W indicates an inner face length of the bottom face portion of the U-shaped portion of the inner corner of the reinforced U-shaped portion of the longitudinal cross-section, H0 indicates an outer face length of the upright face portion of the U-shaped portion of the longitudinal cross-section, H indicates an inner face length of the upright face portion of the U-shaped portion of the inner corner of the reinforced U-shaped portion of the longitudinal cross-section, wherein a closed cross-sectional shape is formed by bonding each of the end portions extending in a longitudinal direction of the first structural member to the corresponding end portion extending in a longitudinal direction of the second structural member, and wherein the flanges are projected outward. ### Claim 2 (depends on 1) The structural member complex according to claim 1, wherein a side edge facing the inside of the U-shaped portion in the cross-section of each of the two corners is linear. ### Claim 3 (depends on 1) The structural member complex according to claim 1, wherein matrix resin forming the fiber reinforcement resin is thermoplastic resin. ### Claim 4 (depends on 1) The structural member complex according to claim 1, wherein matrix resin forming the fiber reinforcement resin is thermosetting resin. ### Claim 5 (depends on 1) The structural member complex according to claim 1, wherein reinforcement fiber forming the fiber reinforcement resin is carbon fiber or glass fiber. ### Claim 6 (depends on 1) The structural member complex according to claim 1, wherein 0.06≤W/W0≤0.14 0.16≤H/H0≤0.35. ### Claim 7 (depends on 1) The structural member complex according to claim 1, wherein W0 is from 10 to 500 mm, H0 is from 5 to 300 mm, W is from 1.0 to 75 mm, and H is from 1.0 to 100 mm. ### Claim 8 (depends on 1) The structural member complex according to claim 1, which resists bending deformation. ### Claim 9 (depends on 1) The structural member complex according to claim 1, wherein the flanges are projected outward at a right angle relative to the two upright faces.