Patents by Inventor Arito Matsui
Arito Matsui 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: 9746037Abstract: A link actuating device includes input side and output side link hubs, and two sets of link mechanisms. Each of the link mechanisms is a three-link-chain link mechanism including four revolute pairs, and includes input side and output side end links rotatably connected to the input side and output side link hubs and an intermediate links rotatably connected to input side and output side end links. The link mechanism have a positional relationship in which the revolute pair axes between the link hubs and the end links are located on the same plane and cross each other. At least one of the two sets of link mechanisms is provided with interlocking unit that interlocks the input side end link and the output side end link to each other so as to be rotationally displaced.Type: GrantFiled: September 24, 2012Date of Patent: August 29, 2017Assignee: NTN CORPORATIONInventors: Keisuke Sone, Hirokazu Ooba, Arito Matsui, Hiroki Mukai
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Publication number: 20140227023Abstract: A link actuating device includes input side and output side link hubs, and two sets of link mechanisms. Each of the link mechanisms is a three-link-chain link mechanism including four revolute pairs, and includes input side and output side end links rotatably connected to the input side and output side link hubs and an intermediate links rotatably connected to input side and output side end links. The link mechanism have a positional relationship in which the revolute pair axes between the link hubs and the end links are located on the same plane and cross each other. At least one of the two sets of link mechanisms is provided with interlocking unit that interlocks the input side end link and the output side end link to each other so as to be rotationally displaced.Type: ApplicationFiled: September 24, 2012Publication date: August 14, 2014Inventors: Keisuke Sone, Hirokazu Ooba, Arito Matsui, Hiroki Mukai
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Patent number: 8297848Abstract: The magnetic encoder (17) includes a slinger (18) fixed to a rotation-side raceway ring of a bearing and including an outer side surface (22) opposed to the side of a sensor to detect rotation speed of the rotation-side raceway ring and having a surface roughness Ra: 0.3 to 3.0 ?m, and an inner side surface (23) opposed to the side of a sealing member (16) to seal the bearing; a multipolar magnet (19) bonded to the outer side surface (22) through an adhesive; and a film (25b) formed on the inner side surface (23), having a surface roughness Ra of 0.3 ?m or less, and being in sliding contact with the sealing member (16).Type: GrantFiled: September 1, 2008Date of Patent: October 30, 2012Assignee: NTN CorporationInventors: Tatsuo Nakajima, Arito Matsui
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Patent number: 8118064Abstract: A fiber reinforced plastic pipe is provided to prevent it from being damaged and make full use of its practical performance when the fiber reinforced plastic pipe, reduced in thickness and increased in diameter by pultrusion process, is reduced in the circumferential direction and inserted into a metal pipe. The fiber reinforced plastic pipe, reduced in thickness and increased in diameter by pultrusion process, includes a fiber bundle spun and aligned in the longitudinal direction, and circumferential reinforced fiber sheet provided at least on one of the outer and inner surface layers. The circumferential reinforced fiber sheet is inserted into the metal pipe to form a power transmission shaft such as an intermediate shaft for use with a propeller shaft or a drive shaft.Type: GrantFiled: January 29, 2002Date of Patent: February 21, 2012Assignees: NTN Corporation, Asahi Glass Matex Co., Ltd., Mitsubishi Rayon Co., Ltd.Inventors: Tatsuo Nakajima, Arito Matsui, Takashi Nishimoto, Go Itohiya, Hajime Asai, Tsuneo Takano
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Publication number: 20100239201Abstract: The magnetic encoder (17) includes a slinger (18) fixed to a rotation-side raceway ring of a bearing and including an outer side surface (22) opposed to the side of a sensor to detect rotation speed of the rotation-side raceway ring and having a surface roughness Ra: 0.3 to 3.0 ?m, and an inner side surface (23) opposed to the side of a sealing member (16) to seal the bearing; a multipolar magnet (19) bonded to the outer side surface (22) through an adhesive; and a film (25b) formed on the inner side surface (23), having a surface roughness Ra of 0.Type: ApplicationFiled: September 1, 2008Publication date: September 23, 2010Inventors: Tatsuo Nakajima, Arito Matsui
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Patent number: 7592799Abstract: A magnetic encoder includes a multipolar magnet, having magnetic poles formed therein so as to alternate with each other in a direction circumferentially thereof, and a core metal supporting the multipolar magnet. The multipolar magnet is prepared from a sintered element formed by sintering a powdery mixture of a magnetic powder and a non-magnetic metallic powder. This multipolar magnet is fixed to the core metal to form a unitary component made up of the sintered element and the core metal. The unitary component is subjected to a surface treatment for anticorrosion.Type: GrantFiled: September 10, 2004Date of Patent: September 22, 2009Assignee: NTN CorporationInventors: Tatsuo Nakajima, Kouya Oohira, Arito Matsui, Kazutoyo Murakami
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Publication number: 20080226211Abstract: A magnetic encoder which can be assembled having a thin-walled structure while securing an excellent detection sensitivity and which can provide an excellent moldability by suitably selecting materials. The magnetic encoder includes a multi-pole magnet having a plurality of opposite magnetic poles alternating in a direction circumferentially thereof, and a core metal for supporting the multi-pole magnet. The multi-pole magnet contains a powdery magnetic material mixed in an amount within the range of 20 to 90 vol. % relative to the total volume of the multi-pole magnet. The multi-pole magnet may be a sintered magnet.Type: ApplicationFiled: April 11, 2008Publication date: September 18, 2008Applicant: NTN CorporationInventors: Tatsuo Nakajima, Kouya Oohira, Arito Matsui, Kazutoyo Murakami
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Publication number: 20080217803Abstract: To enable molding of a hydrodynamic pressure producing part on the flat surface of a material by simple steps highly accurately and at low costs. A microdroplet 13 of an ultraviolet curable type ink from a nozzle head 11 by the ink jet method is caused to land or dropped on the upper end face 2b1 of the material 2b?. The nozzle head 11 and a light source 14 which irradiates a ultraviolet ray are disposed sequentially according to the direction of travel of the material 2b?, and are provided at positions opposing the material 2b?. While the material 2b? is relatively slid, landing or dropping of the ink from the nozzle head 11 and curing of the ink by the ultraviolet ray irradiated from the light source 14 are gradually conducted according to in the direction of travel of the material 2b? to form the hydrodynamic pressure producing part.Type: ApplicationFiled: December 12, 2005Publication date: September 11, 2008Applicant: NTN CORPORATIONInventors: Tatsuo Nakajima, Arito Matsui, Isao Komori
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Patent number: 7374343Abstract: To provide a magnetic encoder which can be assembled having a thin-walled structure while securing an excellent detection sensitivity and which can provide an excellent moldability by suitably selecting materials, the magnetic encoder is provided which includes a multi-pole magnet 14 having a plurality of opposite magnetic poles alternating in a direction circumferentially thereof, and a core metal 11 for supporting the multi-pole magnet. The multi-pole magnet 14 contains a powdery magnetic material mixed in an amount within the range of 20 to 90 vol. % relative to the total volume of the multi-pole magnet 14. The multi-pole magnet 14 may be a sintered magnet.Type: GrantFiled: February 19, 2004Date of Patent: May 20, 2008Assignee: NTN CorporationInventors: Tatsuo Nakajima, Kouya Oohira, Arito Matsui, Kazutoyo Murakami
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Publication number: 20070273362Abstract: A magnetic encoder (10) includes a multipolar magnet (14), having magnetic poles formed therein so as to alternate with each other in a direction circumferentially thereof, and a core metal (11) supporting the multipolar magnet (14). The multipolar magnet (14) is prepared from a sintered element formed by sintering a powdery mixture of a magnetic powder and a non-magnetic metallic powder. This multipolar magnet (14) is fixed to the core metal (11) to form a unitary component (21) made up of the sintered element and the core metal (11). The unitary component (21) is subjected to a surface treatment for anticorrosion.Type: ApplicationFiled: September 10, 2004Publication date: November 29, 2007Inventors: Tatsuo Nakajima, Kouya Oohira, Arito Matsui, Kazutoyo Murakami
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Patent number: 7237960Abstract: To substantially eliminate deficiencies such as portions of the resinous coating, where the film thickness is reduced considerably during the press-fitting, and to aim at providing a high productivity with a reduced cost and without the possibility of occurrence of rusting after a prolonged time of use under severe environmental conditions due to an excellent anticorrosive property, a magnetic encoder (10) includes a multipolar magnet (14) having a plurality of alternating magnetic poles alternating with each other in a direction circumferentially thereof, and a core metal (11) supporting the multipolar magnet (14). The multipolar magnet (14) is formed of a sintered element prepared by mixing and sintering a powdery mixture of a magnetic powder and a non-magnetic metallic powder.Type: GrantFiled: September 15, 2004Date of Patent: July 3, 2007Assignee: NTN CorporationInventors: Kouya Oohira, Tatsuo Nakajima, Arito Matsui, Kazutoyo Murakami
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Patent number: 7207723Abstract: To provide a wheel support bearing assembly capable of securing a satisfactory sealability and of accomplishing an assured press-fit of an magnetic encoder, the wheel support bearing assembly for supporting a vehicle wheel rotatably relative to a vehicle body structure includes an outer member 2, an inner member 1 positioned inside the outer member 2 with an annular bearing space delimited between it and the outer member 2, and rows of rolling elements 3 rollingly within the annular bearing space. At least one sealing unit 5 is provided for sealing one of opposite open ends of the annular bearing space. This sealing unit 5 is comprised in part of a magnetic encoder 10 including a multi-pole magnet member 14 having a plurality of opposite magnetic poles alternating in a direction circumferentially thereof and a first sealing plate 11 serving as a core metal. The first sealing plate 11 is press-fitted onto the inner member 1 with the amount of interference fit to be within the range of 5 to 230 ?m.Type: GrantFiled: March 8, 2004Date of Patent: April 24, 2007Assignee: NTN CorporationInventors: Tatsuo Nakajima, Kouya Oohira, Arito Matsui, Kazutoyo Murakami
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Publication number: 20050058376Abstract: To substantially eliminate deficiencies such as portions of the resinous coating, where the film thickness is reduced considerably during the press-fitting, and to aim at providing a high productivity with a reduced cost and without the possibility of occurrence of rusting after a prolonged time of use under severe environmental conditions due to an excellent anticorrosive property, a magnetic encoder (10) includes a multipolar magnet (14) having a plurality of alternating magnetic poles alternating with each other in a direction circumferentially thereof, and a core metal (11) supporting the multipolar magnet (14). The multipolar magnet (14) is formed of a sintered element prepared by mixing and sintering a powdery mixture of a magnetic powder and a non-magnetic metallic powder.Type: ApplicationFiled: September 15, 2004Publication date: March 17, 2005Applicant: NTN CorporationInventors: Kouya Oohira, Tatsuo Nakajima, Arito Matsui, Kazutoyo Murakami
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Publication number: 20040179760Abstract: To provide a wheel support bearing assembly capable of securing a satisfactory sealability and of accomplishing an assured press-fit of an magnetic encoder, the wheel support bearing assembly for supporting a vehicle wheel rotatably relative to a vehicle body structure includes an outer member 2, an inner member 1 positioned inside the outer member 2 with an annular bearing space delimited between it and the outer member 2, and rows of rolling elements 3 rollingly within the annular bearing space. At least one sealing unit 5 is provided for sealing one of opposite open ends of the annular bearing space. This sealing unit 5 is comprised in part of a magnetic encoder 10 including a multi-pole magnet member 14 having a plurality of opposite magnetic poles alternating in a direction circumferentially thereof and a first sealing plate 11 serving as a core metal. The first sealing plate 11 is press-fitted onto the inner member 1 with the amount of interference fit to be within the range of 5 to 230 &mgr;m.Type: ApplicationFiled: March 8, 2004Publication date: September 16, 2004Applicant: NTN CORPORATIONInventors: Tatsuo Nakajima, Kouya Oohira, Arito Matsui, Kazutoyo Murakami
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Publication number: 20040165799Abstract: To provide a magnetic encoder which can be assembled having a thin-walled structure while securing an excellent detection sensitivity and which can provide an excellent moldability by suitably selecting materials, the magnetic encoder is provided which includes a multi-pole magnet 14 having a plurality of opposite magnetic poles alternating in a direction circumferentially thereof, and a core metal 11 for supporting the multi-pole magnet. The multi-pole magnet 14 contains a powdery magnetic material mixed in an amount within the range of 20 to 90 vol. % relative to the total volume of the multi-pole magnet 14. The multi-pole magnet 14 may be a sintered magnet.Type: ApplicationFiled: February 19, 2004Publication date: August 26, 2004Applicant: NTN CORPORATIONInventors: Tatsuo Nakajima, Kouya Oohira, Arito Matsui, Kazutoyo Murakami
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Publication number: 20020117228Abstract: A fiber reinforced plastic pipe is provided to prevent it from being damaged and make full use of its practical performance when the fiber reinforced plastic pipe, reduced in thickness and increased in diameter by pultrusion process, is reduced in the circumferential direction and inserted into a metal pipe. The fiber reinforced plastic pipe, reduced in thickness and increased in diameter by pultrusion process, includes a fiber bundle spun and aligned in the longitudinal direction, and circumferential reinforced fiber sheet provided at least on one of the outer and inner surface layers. The circumferential reinforced fiber sheet is inserted into the metal pipe to form a power transmission shaft such as an intermediate shaft for use with a propeller shaft or a drive shaft.Type: ApplicationFiled: January 29, 2002Publication date: August 29, 2002Inventors: Tatsuo Nakajima, Arito Matsui, Takashi Nishimoto, Go Itohiya, Hajime Asai, Tsuneo Takano