Patents by Inventor Shigeki Okai
Shigeki Okai 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: 7232118Abstract: A fluid filled vibration-damping device includes an elastic body disposed between a first mounting member and a second mounting member and partially defines a fluid chamber having a non-compressible fluid sealed therein, and exhibits vibration damping action on the basis of flow action of the non-compressible fluid created within the fluid chamber during vibration input. At least one mounting member from among the first and second mounting members is formed independently of the elastic body and is disposed in abutment with the elastic body in an initial load acting direction, while making the mounting member displaceable away from the rubber elastic body in a opposite direction from the initial load acting direction. A rebound stop mechanism for limiting displacement of the mounting member away from the rubber elastic body in a cushion-wise fashion is disposed between the first and second mounting members.Type: GrantFiled: May 3, 2006Date of Patent: June 19, 2007Assignees: Tokai Rubber Industries, Ltd., Nissan Motor Co., Ltd.Inventors: Hajime Maeno, Atsushi Muramatsu, Nobuhiro Yasumuro, Naoki Kaneda, Shigeki Okai
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Publication number: 20070001355Abstract: A fluid filled vibration-damping device includes an elastic body disposed between a first mounting member and a second mounting member and partially defines a fluid chamber having a non-compressible fluid sealed therein, and exhibits vibration damping action on the basis of flow action of the non-compressible fluid created within the fluid chamber during vibration input. At least one mounting member from among the first and second mounting members is formed independently of the elastic body and is disposed in abutment with the elastic body in an initial load acting direction, while making the mounting member displaceable away from the rubber elastic body in a opposite direction from the initial load acting direction. A rebound stop mechanism for limiting displacement of the mounting member away from the rubber elastic body in a cushion-wise fashion is disposed between the first and second mounting members.Type: ApplicationFiled: May 3, 2006Publication date: January 4, 2007Applicant: Tokai Rubber Industries, LTD.Inventors: Hajime Maeno, Atsushi Muramatsu, Nobuhiro Yasumuro, Naoki Kaneda, Shigeki Okai
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Patent number: 7140603Abstract: A vibration damping device having a stopper structure includes: a rubber elastic body of generally frustoconical configuration overall; a first mounting member formed independently of the rubber elastic body, and directly or indirectly superimposed on the rubber elastic body in an external load input direction; and a second mounting member including a cylindrical portion that is bonded to a large diameter side outer circumferential surface of the rubber elastic body. A first and second abutting portions of the first and second mounting members are situated to be opposed to each other in a rebound direction with a given distance interposed therebetween, and a stop rubber is disposed between the first and second abutting portions so that the first and second abutting portions come into abutting contact with each other in a cushion-wise fashion, via the stop rubber to thereby provide a stopper structure.Type: GrantFiled: June 21, 2004Date of Patent: November 28, 2006Assignees: Tokai Rubber Industries, Ltd., Nissan Motor Co., Ltd.Inventors: Hajime Maeno, Atsushi Muramatsu, Nobuhiro Yasumuro, Naoki Kaneda, Shigeki Okai
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Patent number: 6669181Abstract: The vibration isolating apparatus includes, an outer tube, an inner tube disposed at an inner peripheral side of the outer tube, an elastic body disposed between the outer tube and the inner tube, a main fluid chamber which contains a fluid with the elastic body serving as a portion of a partitioning wall of the main fluid chamber and whose internal volume changes due to deformation of the elastic body, a first auxiliary fluid chamber which contains a fluid and a portion of a partitioning wall of the first auxiliary fluid chamber is formed by a diaphragm so as to expand and contract a space between the first auxiliary fluid chamber and the outer tube, a first passage which communicates the main fluid chamber and the first auxiliary fluid chamber, and a second passage which communicates the main fluid chamber and the first auxiliary fluid chamber.Type: GrantFiled: April 16, 2002Date of Patent: December 30, 2003Assignees: Bridgestone Corporation, Nissan Motor Co., Ltd.Inventors: Katsumi Someya, Shigeki Okai
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Publication number: 20020185797Abstract: The vibration isolating apparatus includes, an outer tube, an inner tube disposed at an inner peripheral side of the outer tube, an elastic body disposed between the outer tube and the inner tube, a main fluid chamber which contains a fluid with the elastic body serving as a portion of a partitioning wall of the main fluid chamber and whose internal volume changes due to deformation of the elastic body, a first auxiliary fluid chamber which contains a fluid and a portion of a partitioning wall of the first auxiliary fluid chamber is formed by a diaphragm so as to expand and contract a space between the first auxiliary fluid chamber and the outer tube, a first passage which communicates the main fluid chamber and the first auxiliary fluid chamber, and a second passage which communicates the main fluid chamber and the first auxiliary fluid chamber.Type: ApplicationFiled: April 16, 2002Publication date: December 12, 2002Applicant: BRIDGESTONE CORPORATIONInventors: Katsumi Someya, Shigeki Okai
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Patent number: 6361029Abstract: A vibration damper includes an outer cylinder, an overhung pin which is put inside the outer cylinder, and an elastic rubber body in direct contact with the overhung pin; the outer cylinder, the overhung pin and the elastic rubber body being combined with each other with an adhesion strength the elastic rubber body will have when it is vulcanized.Type: GrantFiled: October 31, 2000Date of Patent: March 26, 2002Assignees: Nissan Motor Co., Ltd., Bridgestone CorporationInventors: Shigeki Okai, Kazutaka Ohtsu