# US 10,309,559 B2 · Duct and method for manufacturing same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,309,559 B2 - Document ID: US10309559B2 - Status: Granted - Kind: B2 - Application number: 14/782,868 - Filed: 2014-04-07 - Published: 2016-04-14 - Granted: 2019-06-04 - Earliest claimed: 2013-04-08 - Assignees: Kyoraku Co., Ltd. - Applicants: Kyoraku Co., Ltd. - Inventors: Kenji Iwasaki; Teruo Tamada - Web page: https://patentgrep.com/patent/US10309559B2 ## CPC - F16L 9/21: made of sound-absorbing materials or with sound-absorbing structure - B29C 51/105: {Twin sheet thermoforming, i.e. deforming two parallel opposing sheets or foils at the same time by using one common mould cavity and without welding them together during thermoforming (B29C51/267, B29C49/0691 take precedence)} - B29C 51/12: of articles having inserts or reinforcements - B29C 51/267: {Two sheets being thermoformed in separate mould parts and joined together while still in the mould (B29C49/0691 takes precedence)} - B60H 1/00564: {of air ducts} - B60L 58/26: by cooling - B60R 16/08: fluid - F16L 9/003: {with a rectangular cross-section (ducting arrangements in air-conditioning or ventilation F24F13/02)} - F24F 13/0245: {Manufacturing or assembly of air ducts; Methods therefor} - F24F 13/24: Means for preventing or suppressing noise - B29K 2023/12: {PP, i.e. polypropylene} - B29K 2105/256: {Sheets, plates, blanks or films} - B29K 2995/0002: insulating - B29L 2031/3032: {Air inlets} - B60H 2001/006: {Noise reduction} - F24F 2013/242: {Sound-absorbing material} - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00) - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS - B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Provided is a duct that does not cause defective molding and has a highly sound absorption inner surface which can effectively suppress noise. A duct includes a tubular duct main body and a sound absorption member disposed on the inner surface of the duct main body. The duct has at least one of configurations (1) to (3): (1) the duct main body has a sandwiching part having a pair of opposite wall surfaces, and a side edge of the sound absorption member is sandwiched between the wall surfaces of the sandwiching part; (2) the sound absorption member is pasted to the inner surface of the duct main body with a resin film therebetween; and (3) the sound absorption member and duct main body have parts which are not fused to each other. ## Claims ### Claim 1 A method for manufacturing a duct comprising a step of causing molds to suck and form a pair of molten resin sheets to be formed into a tubular duct main body, then disposing a sound absorption member on the resin sheets, and closing the molds, wherein the method has at least one of configurations (A) and (C): (A) the molds are configured such that a side edge of the sound absorption member is sandwiched between the pair of resin sheets, the duct main body has an outward protrusion protruding out of the duct main body, the outward protrusion is provided with a rib protruding into the duct main body, and a hollow is formed between the outward protrusion and the sound absorption member; and (C) a recess is formed in the resin sheet, the sound absorption member is pasted to the resin sheets over the recess, and after the duct is taken out of the molds, the recess is cut off to form an opening, exposing the sound absorption member. ### Claim 2 (depends on 1) The method of claim 1, wherein the method has the configuration (A). ### Claim 3 (depends on 2) The method of claim 2, wherein the side edge of the sound absorption member is compressed by the pair of resin sheets when the molds are closed. ### Claim 4 (depends on 1) The method of claim 1, wherein the method has the configuration (C).