Patents by Inventor Daihachi Shojima
Daihachi Shojima 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: 11298858Abstract: A method for manufacturing a sealing device to improve the positioning accuracy of a parting operation while also improving manufacturing efficiency. The method includes molding an elastomeric cylindrical molded body (100a) with a plurality of cylindrical surface portions (130) and a plurality of annular outer peripheral convex portions (110) arranged alternately on an outer peripheral side thereof, and further provided with a plurality of cylindrical surface portions and a plurality of annular inner peripheral convex portions arranged alternately on an inner peripheral side thereof. The cylindrical surface portions on the outer peripheral side and the cylindrical surface portions on the inner peripheral side, as well as the outer peripheral convex portions and the inner peripheral convex portions are provided so as to be at the same positions in the axial direction.Type: GrantFiled: March 14, 2019Date of Patent: April 12, 2022Assignee: NOK CORPORATIONInventors: Hiroaki Sato, Akira Morio, Daihachi Shojima
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Publication number: 20190210257Abstract: A method for manufacturing a sealing device to improve the positioning accuracy of a parting operation while also improving manufacturing efficiency. The method includes molding an elastomeric cylindrical molded body (100a) with a plurality of cylindrical surface portions (130) and a plurality of annular outer peripheral convex portions (110) arranged alternately on an outer peripheral side thereof, and further provided with a plurality of cylindrical surface portions and a plurality of annular inner peripheral convex portions arranged alternately on an inner peripheral side thereof. The cylindrical surface portions on the outer peripheral side and the cylindrical surface portions on the inner peripheral side, as well as the outer peripheral convex portions and the inner peripheral convex portions are provided so as to be at the same positions in the axial direction.Type: ApplicationFiled: March 14, 2019Publication date: July 11, 2019Inventors: Hiroaki SATO, Akira MORIO, Daihachi SHOJIMA
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Patent number: 10279518Abstract: A method for manufacturing a sealing device to improve the positioning accuracy of a parting operation while also improving manufacturing efficiency. The method includes molding an elastomeric cylindrical molded body (100a) with a plurality of cylindrical surface portions (130) and a plurality of annular outer peripheral convex portions (110) arranged alternately on an outer peripheral side thereof, and further provided with a plurality of cylindrical surface portions and a plurality of annular inner peripheral convex portions arranged alternately on an inner peripheral side thereof. The cylindrical surface portions on the outer peripheral side and the cylindrical surface portions on the inner peripheral side, as well as the outer peripheral convex portions and the inner peripheral convex portions are provided so as to be at the same positions in the axial direction.Type: GrantFiled: January 31, 2013Date of Patent: May 7, 2019Assignee: NOK CORPORATIONInventors: Hiroaki Sato, Akira Morio, Daihachi Shojima
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Publication number: 20150290851Abstract: A method for manufacturing a sealing device to improve the positioning accuracy of a parting operation while also improving manufacturing efficiency. The method includes molding an elastomeric cylindrical molded body (100a) with a plurality of cylindrical surface portions (130) and a plurality of annular outer peripheral convex portions (110) arranged alternately on an outer peripheral side thereof, and further provided with a plurality of cylindrical surface portions and a plurality of annular inner peripheral convex portions arranged alternately on an inner peripheral side thereof. The cylindrical surface portions on the outer peripheral side and the cylindrical surface portions on the inner peripheral side, as well as the outer peripheral convex portions and the inner peripheral convex portions are provided so as to be at the same positions in the axial direction.Type: ApplicationFiled: January 31, 2013Publication date: October 15, 2015Inventors: Hiroaki Sato, Akira Morio, Daihachi Shojima
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Patent number: 8474829Abstract: To prevent breakage of a sealing device having a main sealing body installed within an annular installing groove (31) formed in one member (3) to slidably and concentrically contact with the other member (2) and a backup ring (12) arranged at a non-sealing space side of said main sealing body, a height (h1±?h1) of said backup ring (12) in a facing direction of a bottom surface (31a) of said installing groove (31) to the other member (2) is greater than a facing distance (L±?L) between the bottom surface (31a) and the other member (2), and said backup ring (12) has a cross-sectional shape which is symmetrical in a thickness direction thereof, and has an easily compressible part (12a) which can be compressed to the extent of the difference (x) between said height (h1±?h1) and said facing distance (L±?L).Type: GrantFiled: December 15, 2009Date of Patent: July 2, 2013Assignee: NOK CorporationInventors: Masaya Otsuka, Shigemi Matsuo, Daihachi Shojima
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Patent number: 8419992Abstract: This invention provides a mold for a gasket, which can render the planar shape of a mold for integral molding of a large-diameter gasket as small as possible to reduce the size of the manufacturing equipment and, at the same time, by virtue of integral molding, does not require labor and time in the manufacture thereof and does not cause a lack of strength in the connecting part. To this end, a mold (1) for molding an endless-type gasket comprises a plurality of molding parts (11,21), formed by disposing two molding grooves (12, 22), in a spiral wound form, in parallel so as to be adjacent to each other. The spiral wound molding grooves (12, 22) have reversing parts (14, 24) in their respective inner ends (13, 23), and, at the same time, their outer ends (15, 25) are connected to each other in a rope form.Type: GrantFiled: May 11, 2007Date of Patent: April 16, 2013Assignee: NOK CorporationInventors: Kazuyuki Asai, Daihachi Shojima, Kenta Kohatsu
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Patent number: 8079600Abstract: A sealing structure in which sealing is made by a seal ring installed in a dovetail groove where only an inner surface on one side of the groove is an inclined surface. In the sealing structure, the seal ring is less likely to come out of the dovetail groove, resistance of insertion of the seal ring into the dovetail is small, and particles are less likely to occur in the structure. The seal ring is formed of a rubber-like elastic material and is installed in the dovetail groove where the first inner surface on one side of the groove is inclined falling to the inside of the groove.Type: GrantFiled: August 23, 2006Date of Patent: December 20, 2011Assignee: NOK CorporationInventors: Daihachi Shojima, Hideto Nameki
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Publication number: 20110291364Abstract: To prevent breakage of a sealing device having a main sealing body installed within an annular installing groove (31) formed in one member (3) to slidably and concentrically contact with the other member (2) and a backup ring (12) arranged at a non-sealing space side of said main sealing body, a height (h1±?h1) of said backup ring (12) in a facing direction of a bottom surface (31a) of said installing groove (31) to the other member (2) is greater than a facing distance (L±?L) between the bottom surface (31a) and the other member (2), and said backup ring (12) has a cross-sectional shape which is symmetrical in a thickness direction thereof, and has an easily compressible part (12a) which can be compressed to the extent of the difference (x) between said height (h1±?h1) and said facing distance (L±?L).Type: ApplicationFiled: December 15, 2009Publication date: December 1, 2011Applicant: NOK CORPORATIONInventors: Masaya Otsuka, Shigemi Matsuo, Daihachi Shojima
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Patent number: 7942425Abstract: To make a plasma resistant seal excellent in both a plasma resisting performance and a sealing performance, and prevent an O-ring from protruding to a vacuum side gap, a plasma seal (6) made of PTFE having a plasma resisting performance is provided in a plasma irradiating side of an O-ring (5) as a main seal made of a rubber-like elastic material, an installation groove (4) shallower than a depth of an installation groove (3) provided in an installation member (2) is continuously provided in a plasma irradiation side of the installation groove (3), the O-ring (5) is attached to the installation groove (3), and the plasma seal (6) is attached to the installation groove (4) in a compressed state, or the O-ring is attached to the installation groove and the plasma seal is attached to the plasma irradiation side of the same installation groove (3) in a compressed state.Type: GrantFiled: August 7, 2003Date of Patent: May 17, 2011Assignee: NOK CorporationInventor: Daihachi Shojima
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Publication number: 20090174153Abstract: This invention provides a mold for a gasket, which can render the planar shape of a mold for integral molding of a large-diameter gasket as small as possible to reduce the size of the manufacturing equipment and, at the same time, by virtue of integral molding, does not require labor and time in the manufacture thereof and does not cause a lack of strength in the connecting part. To this end, a mold (1) for molding an endless-type gasket comprises a plurality of molding parts (11,21), formed by disposing two molding grooves (12, 22), in a spiral wound form, in parallel so as to be adjacent to each other. The spiral wound molding grooves (12, 22) have reversing parts (14, 24) in their respective inner ends (13, 23), and, at the same time, their outer ends (15, 25) are connected to each other in a rope form.Type: ApplicationFiled: May 11, 2007Publication date: July 9, 2009Applicant: NOK CORPORATIONInventors: Kazuyuki Asai, Daihachi Shojima, Kenta Kohatsu
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Publication number: 20090066038Abstract: A sealing structure in which sealing is made by a seal ring (3) installed in a dovetail groove (12) where only an inner surface (12a) on one side of the groove (12) is an inclined surface. In the sealing structure, the seal ring (3) is less likely to come out of the dovetail groove (12), resistance of insertion of the seal ring (3) into the dovetail (12) is small, and particles are less likely to occur in the structure. The seal ring (3) is formed of a rubber-like elastic material and is installed in the dovetail groove (12) where the first inner surface (12a) on one side of the groove is inclined falling to the inside of the groove.Type: ApplicationFiled: August 23, 2006Publication date: March 12, 2009Inventors: Daihachi Shojima, Hideto Nameki
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Publication number: 20090008885Abstract: A waterproof gasket that ensures easy handling and maintains desirable sealing capability between two members of a resin material made housing of a mobile phone, the waterproof gasket being in contact with the members, is provided. The waterproof gasket to be fitted between the members as constituents of the electronic appliance housing comprises a gasket main body made of a rubbery elastic material and a surface layer resulting from treatment of the surface of the gasket main body with a reactive surface treating agent.Type: ApplicationFiled: March 22, 2007Publication date: January 8, 2009Applicant: NOK CorporationInventors: Hidekazu Kanagae, Daihachi Shojima
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Publication number: 20050253341Abstract: To make a plasma resistant seal excellent in both a plasma resisting performance and a sealing performance, and prevent an O-ring from protruding to a vacuum side gap, a plasma seal (6) made of PTFE having a plasma resisting performance is provided in a plasma irradiating side of an O-ring (5) as a main seal made of a rubber-like elastic material, an installation groove (4) shallower than a depth of an installation groove (3) provided in an installation member (2) is continuously provided in a plasma irradiation side of the installation groove (3), the O-ring (5) is attached to the installation groove (3), and the plasma seal (6) is attached to the installation groove (4) in a compressed state, or the O-ring is attached to the installation groove and the plasma seal is attached to the plasma irradiation side of the same installation groove (3) in a compressed state.Type: ApplicationFiled: August 7, 2003Publication date: November 17, 2005Inventor: Daihachi Shojima
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Patent number: D737415Type: GrantFiled: March 15, 2013Date of Patent: August 25, 2015Assignee: NOK CORPORATIONInventors: Hiroaki Sato, Akira Morio, Daihachi Shojima