Patents by Inventor Masahiro Umezawa
Masahiro Umezawa 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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Publication number: 20230399451Abstract: A method for producing a block copolymer that includes a step (A) of polymerizing a vinyl aromatic monomer at ?5° C. to 35° C. in a mixed solvent including at least one nonpolar solvent selected from methylcyclohexane and methylcyclopentane and an aprotic polar solvent using an anionic polymerization initiator; a step (B) of adding a conjugated diene monomer for further polymerization at ?5° C. to 35° C. after the step (A); and a step (C) of adding a vinyl aromatic monomer for further polymerization at ?5° C. to 35° C. after the step (B) if necessary.Type: ApplicationFiled: October 29, 2021Publication date: December 14, 2023Applicant: NIPPON SODA CO., LTD.Inventors: Shota OSUMI, Toshifumi NOSAKI, Masahiro UMEZAWA
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Patent number: 11701943Abstract: A method for manufacturing a hollow spring member having a hollow steel spring rod having terminal sealed portions at both ends thereof. Each terminal sealed portion has a rotationally symmetric shape in which an axis passing through a center of the spring rod is an axis of symmetry. Each terminal sealed portion has an end wall portion including an end face; an arc-shaped smoothly curved surface between an outer peripheral surface of the spring rod and the end face, and a hermetically closed distal-end-center closure portion on the axis passing through the center of the spring rod. The method includes forming each of the end portions of the spring rod by forming a chamfered portion on an inner or outer peripheral side of the end portion of a hollow wire, the end portion having an opening portion at a distal end, heating the end portion of the hollow wire having the chamfered portion, and spinning the heated end portion to be gathered toward the axis from the outer peripheral side by a jig.Type: GrantFiled: March 17, 2022Date of Patent: July 18, 2023Assignee: NHK SPRING CO., LTDInventors: Masahiro Umezawa, Daisuke Takeda
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Patent number: 11685211Abstract: A method of manufacturing a hollow coil spring which is made of a hollow wire in which a terminal sealed portion is formed on an end portion of the wire. The terminal sealed portion has a rotationally symmetric shape in which an axis passing through the center of the wire is the symmetric axis. The hollow coil spring includes an end wall portion, and an end face arc-shaped curved surface. The end wall portion includes an end face perpendicular to the axis. A distal-end-center closure portion is formed on the axis at the center of the end wall portion. A spring seat includes a base member and a sheet member. An end turn portion of the hollow coil spring is in contact with the sheet member. The end face of the end turn portion is opposed to a stopper wall of the spring seat.Type: GrantFiled: October 26, 2021Date of Patent: June 27, 2023Assignee: NHK SPRING CO., LTDInventors: Masahiro Umezawa, Daisuke Takeda
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Publication number: 20220203800Abstract: A method for manufacturing a hollow spring member having a hollow steel spring rod having terminal sealed portions at both ends thereof. Each terminal sealed portion has a rotationally symmetric shape in which an axis passing through a center of the spring rod is an axis of symmetry. Each terminal sealed portion has an end wall portion including an end face; an arc-shaped smoothly curved surface between an outer peripheral surface of the spring rod and the end face, and a hermetically closed distal-end-center closure portion on the axis passing through the center of the spring rod. The method includes forming each of the end portions of the spring rod by forming a chamfered portion on an inner or outer peripheral side of the end portion of a hollow wire, the end portion having an opening portion at a distal end, heating the end portion of the hollow wire having the chamfered portion, and spinning the heated end portion to be gathered toward the axis from the outer peripheral side by a jig.Type: ApplicationFiled: March 17, 2022Publication date: June 30, 2022Applicant: NHK SPRING CO., LTD.Inventors: Masahiro UMEZAWA, Daisuke TAKEDA
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Patent number: 11254177Abstract: A hollow coil spring is made of a hollow wire in which a terminal sealed portion is formed on an end portion of the wire. The terminal sealed portion has a rotationally symmetric shape in which an axis passing through the center of the wire is the symmetric axis. The hollow coil spring includes an end wall portion, and an end face arc-shaped curved surface. The end wall portion includes an end face perpendicular to the axis. A distal-end-center closure portion is formed on the axis at the center of the end wall portion. A spring seat includes a base member and a sheet member. An end turn portion of the hollow coil spring is in contact with the sheet member. The end face of the end turn portion is opposed to a stopper wall of the spring seat.Type: GrantFiled: September 27, 2018Date of Patent: February 22, 2022Assignee: NHK SPRING CO., LTD.Inventors: Masahiro Umezawa, Daisuke Takeda
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Publication number: 20220041027Abstract: A method of manufacturing a hollow coil spring which is made of a hollow wire in which a terminal sealed portion is formed on an end portion of the wire. The terminal sealed portion has a rotationally symmetric shape in which an axis passing through the center of the wire is the symmetric axis. The hollow coil spring includes an end wall portion, and an end face arc-shaped curved surface. The end wall portion includes an end face perpendicular to the axis. A distal-end-center closure portion is formed on the axis at the center of the end wall portion. A spring seat includes a base member and a sheet member. An end turn portion of the hollow coil spring is in contact with the sheet member. The end face of the end turn portion is opposed to a stopper wall of the spring seat.Type: ApplicationFiled: October 26, 2021Publication date: February 10, 2022Applicant: NHK SPRING CO., LTD.Inventors: Masahiro UMEZAWA, Daisuke TAKEDA
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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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Publication number: 20190030973Abstract: A hollow coil spring is made of a hollow wire in which a terminal sealed portion is formed on an end portion of the wire. The terminal sealed portion has a rotationally symmetric shape in which an axis passing through the center of the wire is the symmetric axis. The hollow coil spring includes an end wall portion, and an end face arc-shaped curved surface. The end wall portion includes an end face perpendicular to the axis. A distal-end-center closure portion is formed on the axis at the center of the end wall portion. A spring seat includes a base member and a sheet member. An end turn portion of the hollow coil spring is in contact with the sheet member. The end face of the end turn portion is opposed to a stopper wall of the spring seat.Type: ApplicationFiled: September 27, 2018Publication date: January 31, 2019Applicant: NHK SPRING CO., LTD.Inventors: Masahiro UMEZAWA, Daisuke TAKEDA
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Publication number: 20190030979Abstract: On an end portion of a hollow rod, which is a material of a hollow coil spring, a terminal sealed portion is formed. The terminal sealed portion has a rotationally symmetric shape in which an axis passing through the center of the rod is a symmetric axis. The terminal sealed portion includes an end wall portion, and a distal-end-center closure portion formed on the axis. In the distal-end-center closure portion, a distal end opening portion of the spin-formed rod is joined together and formed as an integral part. On the axis at the inner surface of the end wall portion, a recess having a rotationally symmetric shape in which the axis is the symmetric axis is formed. A thickness of the recess of the end wall portion is reduced toward the axis.Type: ApplicationFiled: September 27, 2018Publication date: January 31, 2019Applicant: NHK SPRING CO., LTD.Inventors: Masahiro UMEZAWA, Daisuke TAKEDA
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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: 7963510Abstract: A compression coil spring device suitable for use in a strut wheel suspension system. The device includes a coil wire wound into a coil having an end turn. The end turn of the coil, and only the end turn of the coil, is provided with a plurality of projections along the length thereof, with the remainder of the coil wire being substantially free of projections.Type: GrantFiled: July 25, 2006Date of Patent: June 21, 2011Assignee: NHK Spring Co., Ltd.Inventors: Masahiro Umezawa, Tomotake Kato, Toshio Hamano, Masanao Ueda
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Publication number: 20070176340Abstract: In a compression coil spring device, suitable for use in a strut wheel suspension system, including a coil wire wound into a coil having an end turn, the end turn is adapted to be supported by a spring seat at one or a plurality of discrete points. This can be accomplished either by providing a plurality of projections on the coil wire along the length of the coil wire of the end turn, with the remainder of the coil wire being substantially free of projections, or by providing a plurality of projections for supporting the end turn at one or a plurality of discrete points of the spring seat. Thus, the spring demonstrates the same property with regard to the centroid of contact pressure or line of action of the spring force, and the spring constant, without regard to the spring load as long as the spring end is supported by the same discrete contact point or points.Type: ApplicationFiled: July 25, 2006Publication date: August 2, 2007Inventors: Masahiro Umezawa, Tomotake Kato, Toshio Hamano, Masanao Ueda
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Publication number: 20050051937Abstract: In a compression coil spring device, suitable for use in a strut wheel suspension system, including a coil wire wound into a coil having an end turn, the end turn is adapted to be supported by a spring seat at one or a plurality of discrete points. This can be accomplished either by providing a plurality of projections on the coil wire along the length of the coil wire of the end turn or by providing a plurality of projections for supporting the end turn at one or a plurality of discrete points of the spring seat. Thus, the spring demonstrates a same property with regard to the centroid of contact pressure or line of action of the spring force, and the spring constant without regard to the spring load as long as the spring end is supported by the same discrete contact point or points.Type: ApplicationFiled: November 25, 2002Publication date: March 10, 2005Inventors: Masahiro Umezawa, Tomotake Kato, Toshio Hamano, Masanao Ueda
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Patent number: H1062Abstract: An apparatus for sticking onto a screen plate a photosensitive laminated film obtained by forming a layer of a photosensitive agent on one surface of a base film, wherein a blade is provided on the front side of rollers that hold the photosensitive laminated film to press-adhere said photosensitive laminated film onto the screen plate. The tip of the blade presses the photosensitive laminated film onto the screen plate such that an angle is defined between the photosensitive laminated film and the screen plate to get rid of the air. Therefore, no bubbles are trapped therebetween.Type: GrantFiled: June 19, 1990Date of Patent: June 2, 1992Assignee: Process Lab. Micron Co., Ltd.Inventor: Masahiro Umezawa