Patents by Inventor Takuhiro Murakami
Takuhiro Murakami has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8876578Abstract: A portable working machine is provided with a wheel guard partially covering a wheel rotated by a drive source such as an engine, and the wheel guard is retained by a retaining portion of an arm via rubber dampers serving as elastic members. Concave-convex portions are formed on the rubber dampers, a convex-concave portion corresponding to the concave-convex portions is formed in the wheel guard side, and the wheel guard is retained by the arm so that the concave-convex portions are engaged with the convex-concave portion.Type: GrantFiled: April 27, 2012Date of Patent: November 4, 2014Assignee: Hitachi Koki Co., Ltd.Inventor: Takuhiro Murakami
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Publication number: 20140153171Abstract: A power supply device includes a main body, a cover member, a rechargeable battery, and an inverter device. The main body is configured of box-shape formed with an opening. The cover member is configured to open and close the opening. The rechargeable battery is accommodated in the main body. The inverter device is configured to be accommodated in the main body. The inverter device converts a direct voltage from the battery to an alternating voltage and outputs the alternating voltage.Type: ApplicationFiled: August 17, 2012Publication date: June 5, 2014Applicant: Hitachi Koki Co., Ltd.Inventors: Masayuki Ogura, Shinji Watanabe, Haruhisa Fujisawa, Kazuhiko Funabashi, Takuhiro Murakami, Yasushi Nakano, Hideki Watanabe, Norihide Tao, Takafumi Itoh
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Publication number: 20130160740Abstract: An engine including: a cylinder block formed with a cylinder bore; a carburetor including, a fuel storage portion that stores fuel supplied from a fuel tank and supplies the fuel to a suction path, and a fuel discharge path that discharges fuel overflowed from the fuel storage portion; a starting fuel supply device including, a starting fuel storage chamber that is provided on a fuel route defined by the fuel tank and the carburetor and stores a predetermined amount of fuel, a fuel delivery portion that delivers the fuel to a starting fuel supply path connected to the suction path or the cylinder bore, and a fuel return path that discharges the fuel overflowed from the starting fuel storage chamber; and a notifying portion that visually notifies that the starting fuel storage chamber is filled with fuel.Type: ApplicationFiled: April 28, 2011Publication date: June 27, 2013Applicant: HITACHI KOKI CO., LTD.Inventors: Junichi Kamimura, Takuhiro Murakami, Naoto Ichihashi, Kentarou Kanaya
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Publication number: 20120276823Abstract: A portable working machine is provided with a wheel guard partially covering a wheel rotated by a drive source such as an engine, and the wheel guard is retained by a retaining portion of an arm via rubber dampers serving as elastic members. Concave-convex portions are formed on the rubber dampers, a convex-concave portion corresponding to the concave-convex portions is formed in the wheel guard side, and the wheel guard is retained by the arm so that the concave-convex portions are engaged with the convex-concave portion.Type: ApplicationFiled: April 27, 2012Publication date: November 1, 2012Inventor: Takuhiro MURAKAMI
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Patent number: 7416031Abstract: An impact tool comprising a motor, a hammer 8 that is rotated and axially moved by a drive force of the motor, an anvil 3 that repeats engagement/disengagement from the hammer 8 accompanying rotation and axial movements of the hammer 8, and a tip tool 4 mounted to the anvil 3, the anvil 3 comprising a first split piece 3A, which includes pawls 3c (first concave-convex part) on an opposite side to the hammer and repeats engagement/disengagement from the hammer 8, a second split piece 3B, which includes pawls 3f (second concave-convex part) engageable with the pawls (first concave-convex part) 3c of the first split piece 3A in a direction of rotation, and to which the tip tool 4 is mounted, and a rubber damper (elastic body) 13 interposed between the first and second split pieces 3A, 3B to prevent direct contact between the pawls (first concave-convex part) 3c and the pawls (second concave-convex part) 3f in the direction of rotation and in an axial direction.Type: GrantFiled: April 7, 2006Date of Patent: August 26, 2008Assignee: Hitachi Koki Co., Ltd.Inventors: Takuhiro Murakami, Junichi Kamimura, Katsuhiro Oomori, Shinki Ohtsu, Hiroto Inagawa
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Patent number: 7328494Abstract: A method for fixing a driver blade to a piston of a fastener driving tool having a housing, a cylinder, a piston having a piston body and a boss with a groove, extending in the axial direction, and a driver blade having a pair of protrusions. The method includes positioning the driver blade above the piston body, inserting the driver blade into the groove in order to form an assembly of the driver blade and the piston, supplying a brazing metal onto boundary positions between the protrusions and the boss, and heating the assembly at a temperature above a melting point of the brazing metal so that molten brazing metal is flowed downwardly into spaces between the boss and the driver blade and the driver blade becomes fixed to the piston by brazing with the brazing metal.Type: GrantFiled: November 27, 2006Date of Patent: February 12, 2008Assignee: Hitachi Koki Co., Ltd.Inventors: Hiroki Kitagawa, Takuhiro Murakami
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Publication number: 20070179328Abstract: An impact tool, which can realize the reduction of noise without inviting the reduction of a fastening ability and which can improve the durability of a damper while preventing its damage. The impact tool includes a rotary impact mechanism mounted on a spindle to be rotationally driven by a motor, so that rotary impact is applied to a tip tool by transmitting the rotary impact intermittently from a hammer through an anvil to the tip tool. A plurality of pawls are formed on two half members of the anvil in the axial direction. A rubber damper is disposed in a space between the pawls arranged alternately in the circumferential direction of the two half members. The minimum sectional area of the space formed between the pawls is set larger than the sectional area of the rubber damper.Type: ApplicationFiled: January 26, 2007Publication date: August 2, 2007Inventors: Takuhiro Murakami, Junichi Kamimura, Katsuhiro Oomori, Shinki Ohtsu, Hiroto Inagawa
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Publication number: 20070067980Abstract: A method for fixing a driver blade to a piston of a fastener driving tool having a housing, a cylinder, a piston having a piston body and a boss with a groove, extending in the axial direction, and a driver blade having a pair of protrusions. The method includes positioning the driver blade above the piston body, inserting the driver blade into the groove in order to form an assembly of the driver blade and the piston, supplying a brazing metal onto boundary positions between the protrusions and the boss, and heating the assembly at a temperature above a melting point of the brazing metal so that molten brazing metal is flowed downwardly into spaces between the boss and the driver blade and the driver blade becomes fixed to the piston by brazing with the brazing metal.Type: ApplicationFiled: November 27, 2006Publication date: March 29, 2007Inventors: Hiroki Kitagawa, Takuhiro Murakami
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Publication number: 20070034398Abstract: An impact tool for reducing noise without lowering the tightening ability. The impact tool gives a rotary blow force to a tip tool by mounting a rotary blow mechanism on a spindle rotatably driven by a motor and intermittently transferring the rotary blow force generated by the rotary blow mechanism from a hammer to the tip tool via an anvil, damping materials absorbing at least the vibration in the radial direction are arranged on at least one side of both supports of the axial direction of the spindle 7. The damping material is interposed between a bearing that rotatably supports the rear end portion of the spindle and an inner cover that holds the same, and an O-ring is interposed as a damping material between the front end portion of the spindle and an anvil that rotatably supports the same.Type: ApplicationFiled: August 9, 2006Publication date: February 15, 2007Inventors: Takuhiro Murakami, Junichi Kamimura, Katsuhiro Oomori, Shinki Ohtsu, Hiroto Inagawa, Hideki Watanabe
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Publication number: 20060254789Abstract: An impact tool comprising a motor, a hammer 8 that is rotated and axially moved by a drive force of the motor, an anvil 3 that repeats engagement/disengagement from the hammer 8 accompanying rotation and axial movements of the hammer 8, and a tip tool 4 mounted to the anvil 3, the anvil 3 comprising a first split piece 3A, which includes pawls 3c (first concave-convex part) on an opposite side to the hammer and repeats engagement/disengagement from the hammer 8, a second split piece 3B, which includes pawls 3f (second concave-convex part) engageable with the pawls (first concave-convex part) 3c of the first split piece 3A in a direction of rotation, and to which the tip tool 4 is mounted, and a rubber damper (elastic body) 13 interposed between the first and second split pieces 3A, 3B to prevent direct contact between the pawls (first concave-convex part) 3c and the pawls (second concave-convex part) 3f in the direction of rotation and in an axial direction.Type: ApplicationFiled: April 7, 2006Publication date: November 16, 2006Inventors: Takuhiro Murakami, Junichi Kamimura, Katsuhiro Oomori, Shinki Ohtsu, Hiroto Inagawa
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Publication number: 20060254786Abstract: An impact tool includes a rotational impact mechanism which is attached to a spindle 7 rotated and driven by a motor, a rotational impact force generated by the rotational impact mechanism which is intermittently transmitted from a hammer 8 via an anvil 3 to a bit tool 4, thereby giving the rotational impact force to the bit tool 4, and the anvil 3 is provided with a buffer mechanism (rubber damper 13) performing a buffer function in a rotational direction and in an axial direction and also directly transmitting a rotational torque greater than a set value and the spindle 7 is fitted into the anvil 3 and the buffer mechanism (rubber damper 3).Type: ApplicationFiled: May 8, 2006Publication date: November 16, 2006Inventors: Takuhiro Murakami, Junichi Kamimura, Katsuhiro Oomori, Shinki Ohtsu, Hiroto Inagawa, Hideki Watanabe
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Patent number: 6921009Abstract: A nailing machine, in which a part constituting a nose is changed so as to increase the service life of a driver blade for driving a nail. The nailing machine includes a nose having a nose hole in which the nail is supplied, and the driver blade made of metal. At least a part of a surface of the nose hole to be in contact with a front surface of the driver blade is provided with a protective body. The protective body is made of an organic material or a composite material of an organic material and a metal material. Due to this, direct mutual contact of the metal parts is prevented.Type: GrantFiled: October 25, 2002Date of Patent: July 26, 2005Assignee: Hitachi Koki Co., Ltd.Inventors: Satsuo Sato, Takuhiro Murakami, Kunio Yamamoto
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Patent number: 6863135Abstract: Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission key 7 composed of high-strength plastic is provided between an output shaft 3 and a gear 4, and a plane or a V-groove is formed on each of the output shaft 3 and the gear 4 contacting the power transmission key 7.Type: GrantFiled: August 28, 2003Date of Patent: March 8, 2005Assignee: Hitachi Koki Co., Ltd.Inventors: Junichi Kamimura, Mitsuo Ogura, Mitsuyuki Ishikawa, Yoshimitsu Kawasaki, Juurou Kobayashi, Naoya Eto, Hiroto Inagawa, Takuhiro Murakami, Satsuo Sato, Yoshikazu Yokoyama
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Publication number: 20040238591Abstract: A fastener driving tool includes a housing, a cylinder supported to the housing, a piston, and a driver blade. The piston is reciprocally movable in the cylinder in an axial direction thereof. The piston includes a piston body and a boss integrally extending from the piston body in the axial direction. The boss is formed with a fitting groove extending in the axial direction, and the driver blade having a fitting portion is inserted into the fitting groove. Brazing material is distributed between the fitting groove and the fitting portion. The boss is in cylindrical shape, and the driver blade has a pair of protrusions extending in the axial direction and spaced away from each other by a diameter of the boss.Type: ApplicationFiled: May 25, 2004Publication date: December 2, 2004Inventors: Hiroki Kitagawa, Takuhiro Murakami
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Publication number: 20040040399Abstract: Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission key 7 composed of high-strength plastic is provided between an output shaft 3 and a gear 4, and a plane or a V-groove is formed on each of the output shaft 3 and the gear 4 contacting the power transmission key 7.Type: ApplicationFiled: August 28, 2003Publication date: March 4, 2004Applicant: HITACHI KOKI CO., LTD.Inventors: Junichi Kamimura, Mitsuo Ogura, Mitsuyuki Ishikawa, Yoshimitsu Kawasaki, Juurou Kobayashi, Naoya Eto, Hiroto Inagawa, Takuhiro Murakami, Satsuo Sato, Yoshikazu Yokoyama
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Patent number: 6619410Abstract: Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission key 7 composed of high-strength plastic is provided between an output shaft 3 and a gear 4, and a plane or a V-groove is formed on each of the output shaft 3 and the gear 4 contacting the power transmission key 7.Type: GrantFiled: August 6, 2001Date of Patent: September 16, 2003Assignee: Hitachi Koki Co., Ltd.Inventors: Junichi Kamimura, Mitsuo Ogura, Mitsuyuki Ishikawa, Yoshimitsu Kawasaki, Juurou Kobayashi, Naoya Eto, Hiroto Inagawa, Takuhiro Murakami, Satsuo Sato, Yoshikazu Yokoyama
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Publication number: 20030080171Abstract: A nailing machine, such as a pneumatic nailing machine, in which a part constituting a nose is changed so as to increase the service life of a driver blade for driving a nail. The nailing machine includes a nose having a nose hole in which the nail is supplied, and the driver blade made of metal. At least a part of a surface of the nose hole to be in contact with a front surface of the driver blade is provided with a protective body. The protective body is made of an organic material or a composite material of an organic material and a metal material. Due to this, direct mutual contact of the metal parts is prevented.Type: ApplicationFiled: October 25, 2002Publication date: May 1, 2003Applicant: Hitachi Koki Co., Ltd.Inventors: Satsuo Sato, Takuhiro Murakami, Kunio Yamamoto
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Publication number: 20020020540Abstract: Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission key 7 composed of high-strength plastic is provided between an output shaft 3 and a gear 4, and a plane or a V-groove is formed on each of the output shaft 3 and the gear 4 contacting the power transmission key 7.Type: ApplicationFiled: August 6, 2001Publication date: February 21, 2002Inventors: Junichi Kamimura, Mitsuo Ogura, Mitsuyuki Ishikawa, Yoshimitsu Kawasaki, Juurou Kobayashi, Naoya Eto, Hiroto Inagawa, Takuhiro Murakami, Satsuo Sato, Yoshikazu Yokoyama
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Patent number: D622660Type: GrantFiled: December 18, 2009Date of Patent: August 31, 2010Assignee: Hitachi Koki Co., Ltd.Inventors: Takeshi Taniguchi, Masanori Okada, Takuhiro Murakami
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Patent number: D668608Type: GrantFiled: January 13, 2012Date of Patent: October 9, 2012Assignee: Hitachi Koki Co., Ltd.Inventors: Takafumi Itoh, Masanori Okada, Hiroyuki Hasegawa, Masayuki Ogura, Takuhiro Murakami