Patents by Inventor Kenji Yamamotoya
Kenji Yamamotoya 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: 10358008Abstract: A suspension coil spring includes a lower end turn portion, an upper end turn portion, and a helical effective portion formed between the end turn portions. The lower end turn portion includes a first portion which contacts a lower spring seat irrespective of a load, and a second portion which contacts the lower spring seat or is separated from the same according to the load. The wire diameter of the second portion is greater than that of the first portion and an average wire diameter of the effective portion. The upper end turn portion includes a third portion which contacts an upper spring seat, and a fourth portion. The wire diameter of the fourth portion is greater that of the third portion and the average wire diameter of the effective portion.Type: GrantFiled: October 27, 2015Date of Patent: July 23, 2019Assignee: NHK SPRING CO., LTD.Inventors: Kenji Yamamotoya, Hideto Enomoto, Ken Takahashi, Toshiaki Sato, Mitsuhiro Sugiyama, Yoshio Kobayashi, Taichi Inage, Tomotake Kato, Akihiko Nishikawa, Masahiro Umezawa, Michihiko Ayada, Suguru Kajigaya
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Patent number: 9713946Abstract: A strut-type suspension includes a compression coil spring, a lower spring seat, an upper spring seat, and a shock absorber. The compression coil spring is disposed at a position offset to the outer side of a vehicle with respect to the shock absorber. The compression coil spring is mounted in a vehicle body in such a state that it is compressed between spring seats. The compression coil spring includes a large-diameter wire portion and a small-diameter wire portion. The large-diameter wire portion is provided in a vehicle inner-side portion of the compression coil spring. The small-diameter wire portion is provided in a vehicle outer-side portion. A wire diameter of the large-diameter wire portion is greater than a wire diameter of the small-diameter wire portion.Type: GrantFiled: May 4, 2015Date of Patent: July 25, 2017Assignee: NHK SPRING CO., LTD.Inventors: Kenji Yamamotoya, Hideto Enomoto, Ken Takahashi, Toshiaki Sato, Mitsuhiro Sugiyama, Yoshio Kobayashi, Taichi Inage, Tomotake Kato, Akihiko Nishikawa, Masahiro Umezawa, Michihiko Ayada, Suguru Kajigaya
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Patent number: 9463676Abstract: A knee-action-type suspension is provided with an arm member, a compression coil spring, and a shock absorber. The coil spring is extended and retracted between a full-rebound state and a full-bump state in accordance with the magnitude of a load applied to a vehicle body. A wire of the coil spring includes a large-diameter wire portion, a small-diameter wire portion, and a wire diameter varying portion. The large-diameter wire portion is provided in a first portion of the coil spring, which is on the side near to a pivot. The small-diameter wire portion is provided in a second portion of the coil spring, which is on the side far from the pivot. A wire diameter of the large-diameter wire portion is greater than a wire diameter of the small-diameter wire portion.Type: GrantFiled: May 4, 2015Date of Patent: October 11, 2016Assignee: NHK SPRING CO., LTD.Inventors: Kenji Yamamotoya, Hideto Enomoto, Ken Takahashi, Toshiaki Sato, Mitsuhiro Sugiyama, Yoshio Kobayashi, Taichi Inage, Tomotake Kato, Akihiko Nishikawa, Masahiro Umezawa, Michihiko Ayada, Suguru Kajigaya
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Publication number: 20160046164Abstract: A suspension coil spring includes a lower end turn portion, an upper end turn portion, and a helical effective portion formed between the end turn portions. The lower end turn portion includes a first portion which contacts a lower spring seat irrespective of a load, and a second portion which contacts the lower spring seat or is separated from the same according to the load. The wire diameter of the second portion is greater than that of the first portion and an average wire diameter of the effective portion. The upper end turn portion includes a third portion which contacts an upper spring seat, and a fourth portion. The wire diameter of the fourth portion is greater that of the third portion and the average wire diameter of the effective portion.Type: ApplicationFiled: October 27, 2015Publication date: February 18, 2016Applicant: NHK SPRING CO., LTD.Inventors: Kenji YAMAMOTOYA, Hideto ENOMOTO, Ken TAKAHASHI, Toshiaki SATO, Mitsuhiro SUGIYAMA, Yoshio KOBAYASHI, Taichi INAGE, Tomotake KATO, Akihiko NISHIKAWA, Masahiro UMEZAWA, Michihiko AYADA, Suguru KAJIGAYA
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Publication number: 20150251514Abstract: A strut-type suspension includes a compression coil spring, a lower spring seat, an upper spring seat, and a shock absorber. The compression coil spring is disposed at a position offset to the outer side of a vehicle with respect to the shock absorber. The compression coil spring is mounted in a vehicle body in such a state that it is compressed between spring seats. The compression coil spring includes a large-diameter wire portion and a small-diameter wire portion. The large-diameter wire portion is provided in a vehicle inner-side portion of the compression coil spring. The small-diameter wire portion is provided in a vehicle outer-side portion. A wire diameter of the large-diameter wire portion is greater than a wire diameter of the small-diameter wire portion.Type: ApplicationFiled: May 4, 2015Publication date: September 10, 2015Applicant: NHK SPRING CO., LTD.Inventors: Kenji YAMAMOTOYA, Hideto ENOMOTO, Ken TAKAHASHI, Toshiaki SATO, Mitsuhiro SUGIYAMA, Yoshio KOBAYASHI, Taichi INAGE, Tomotake KATO, Akihiko NISHIKAWA, Masahiro UMEZAWA, Michihiko AYADA, Suguru KAJIGAYA
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Publication number: 20150231939Abstract: A knee-action-type suspension is provided with an arm member, a compression coil spring, and a shock absorber. The coil spring is extended and retracted between a full-rebound state and a full-bump state in accordance with the magnitude of a load applied to a vehicle body. A wire of the coil spring includes a large-diameter wire portion, a small-diameter wire portion, and a wire diameter varying portion. The large-diameter wire portion is provided in a first portion of the coil spring, which is on the side near to a pivot. The small-diameter wire portion is provided in a second portion of the coil spring, which is on the side far from the pivot. A wire diameter of the large-diameter wire portion is greater than a wire diameter of the small-diameter wire portion.Type: ApplicationFiled: May 4, 2015Publication date: August 20, 2015Applicant: NHK SPRING CO., LTD.Inventors: Kenji YAMAMOTOYA, Hideto ENOMOTO, Ken TAKAHASHI, Toshiaki SATO, Mitsuhiro SUGIYAMA, Yoshio KOBAYASHI, Taichi INAGE, Tomotake KATO, Akihiko NISHIKAWA, Masahiro UMEZAWA, Michihiko AYADA, Suguru KAJIGAYA
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Patent number: 8695956Abstract: Bending deformation exceeding a yield stress is applied by winding a material on a mandrel. Coiling is performed simultaneously with the application of the bending deformation, and the load is removed after the coiling. This spring includes an outside surface region having a compressive residual stress and a compressive stress reduction region in which the compressive residual stress is reduced from the outside surface region toward the center of the material. A stress change portion at which a change from the compressive residual stress to a tensile residual stress occurs exists between the outside surface region and the center of the material. The spring further includes a tensile stress peak portion, tensile stress reduction region, and inside surface region. The inside surface region has the tensile compressive residual stress having an absolute value smaller than that of the outside surface region.Type: GrantFiled: September 25, 2011Date of Patent: April 15, 2014Assignee: NHK Spring Co., Ltd.Inventors: Toshio Hamano, Hideki Okada, Kenji Yamamotoya
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Patent number: 8297516Abstract: Without using a component such as a chip coil, a winding pattern is formed with a wire with which a main wiring pattern is formed. This enables to deal with the flexibility by realizing a thin product using a coil antenna. Further, the wiring pattern is designed such that the winding pattern is provided and distributed to the main wiring pattern forming a loop, and is formed with the wire so as to have a wound shape small enough compared with the main wiring pattern. In this way, the ratio of the self-inductance to the mutual inductance is appropriately made further large, so that the mutual inductance is made comparatively small.Type: GrantFiled: November 18, 2008Date of Patent: October 30, 2012Assignee: NHK Spring Co., Ltd.Inventors: Kiyotaka Fukushima, Kenji Yamamotoya, Masayuki Miura, Kenichiro Tami
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Publication number: 20120013059Abstract: Bending deformation exceeding a yield stress is applied by winding a material on a mandrel. Coiling is performed simultaneously with the application of the bending deformation, and the load is removed after the coiling. This spring includes an outside surface region having a compressive residual stress and a compressive stress reduction region in which the compressive residual stress is reduced from the outside surface region toward the center of the material. A stress change portion at which a change from the compressive residual stress to a tensile residual stress occurs exists between the outside surface region and the center of the material. The spring further includes a tensile stress peak portion, tensile stress reduction region, and inside surface region. The inside surface region has the tensile compressive residual stress having an absolute value smaller than that of the outside surface region.Type: ApplicationFiled: September 25, 2011Publication date: January 19, 2012Applicant: NHK SPRING CO., LTD.Inventors: Toshio Hamano, Hideki Okada, Kenji Yamamotoya
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Publication number: 20100230501Abstract: Without using a component such as a chip coil, a winding pattern is formed with a wire with which a main wiring pattern is formed. This enables to deal with the flexibility by realizing a thin product using a coil antenna. Further, the wiring pattern is designed such that the winding pattern is provided and distributed to the main wiring pattern forming a loop, and is formed with the wire so as to have a wound shape small enough compared with the main wiring pattern. In this way, the ratio of the self-inductance to the mutual inductance is appropriately made further large, so that the mutual inductance is made comparatively small.Type: ApplicationFiled: November 18, 2008Publication date: September 16, 2010Applicant: NHK Spring Co., Ltd.Inventors: Kiyotaka Fukushima, Kenji Yamamotoya, Masayuki Miura, Kenichiro Tami
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Publication number: 20040171162Abstract: A discrimination mark having both a simple authentication function by perceptual recognition and an accurate authentication function by mechanical recognition enabled by using a combination of a mark having an authentication function by perceptual recognition with a substance having a content of a table isotope different from the natural abundance. The S/N ratio can be made large in making a mechanical recognition, so that the authentication by mechanical recognition can be implemented with high accuracy. The substance having a controlled content of a stable isotope different from the natural abundance is a rate one itself and difficult to produce. As a result, this discrimination mark has a high security level.Type: ApplicationFiled: December 12, 2003Publication date: September 2, 2004Inventors: Tokudai Neda, Yasuharu Yokoi, Hidekazu Hoshino, Itsuo Takeuchi, Kenji Yamamotoya