Patents by Inventor Yoichi Oshita
Yoichi Oshita 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: 10199188Abstract: A bidirectional driving mechanism 10 has a drive-side linkage rod 11, a driven-side linkage rod 13, two levers 12 that link the drive-side linkage rod with the driven-side linkage rod, and a guide 14 that regulates the operation of the drive-side linkage rod 11 and the driven-side linkage rod 13. A moveable pin 18 is passed through a first groove cam 16 of the drive-side linkage rod 11, a second groove cam 17 of the guide 14, and third groove cams 19 of the levers 12, and by operation of the drive-side rod 13, the moveable pin 18 moves within the respective groove cams 16, 17, 19, causing the levers 12 to rotate, the driven-side linkage rod 13 to be driven in a direction opposite to the drive-side linkage rod 11, and a driven-side arc electrode 5 to be driven in a direction opposite to a drive-side arc electrode 4.Type: GrantFiled: January 12, 2016Date of Patent: February 5, 2019Assignee: Hitachi, Ltd.Inventors: Masanao Terada, Yuki Nakai, Yoichi Oshita, Hiroaki Hashimoto, Hajime Urai, Katsuhiko Shiraishi
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Patent number: 9899172Abstract: The invention is intended to provide a circuit breaker or a circuit breaker operating method enabling a current interruption action to be performed efficiently. A circuit breaker is characterized in that includes a fixed contact and a movable contact that comes in and goes out of contact with the fixed contact; a main circuit conductor that is electrically connected to the fixed contact and the movable contact; an operating mechanism including a mover configured by concatenating permanent magnets or magnetic materials alternately having opposite N and S magnetic polarities along the direction of motion axis of the movable contact and magnetic poles disposed to face the N and S magnetic polarities of the mover and wound with windings; a current detector that detects a current flowing through the main circuit conductor; and a control device that varies the amount of a current to be supplied to the windings of the magnetic poles, depending on a current value detected by the current detector.Type: GrantFiled: March 27, 2013Date of Patent: February 20, 2018Assignee: Hitachi, Ltd.Inventors: Hajime Urai, Yasuaki Aoyama, Hiroaki Hashimoto, Katsuhiko Shiraishi, Tatsuro Kato, Ayumu Morita, Toshiaki Rokunohe, Yoichi Oshita
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Publication number: 20180025868Abstract: A bidirectional driving mechanism 10 has a drive-side linkage rod 11, a driven-side linkage rod 13, two levers 12 that link the drive-side linkage rod with the driven-side linkage rod, and a guide 14 that regulates the operation of the drive-side linkage rod 11 and the driven-side linkage rod 13. A moveable pin 18 is passed through a first groove cam 16 of the drive-side linkage rod 11, a second groove cam 17 of the guide 14, and third groove cams 19 of the levers 12, and by operation of the drive-side rod 13, the moveable pin 18 moves within the respective groove cams 16, 17, 19, causing the levers 12 to rotate, the driven-side linkage rod 13 to be driven in a direction opposite to the drive-side linkage rod 11, and a driven-side arc electrode 5 to be driven in a direction opposite to a drive-side arc electrode 4.Type: ApplicationFiled: January 12, 2016Publication date: January 25, 2018Applicant: HITACHI, LTD.Inventors: Masanao TERADA, Yuki NAKAI, Yoichi OSHITA, Hiroaki HASHIMOTO, Hajime URAI, Katsuhiko SHIRAISHI
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Patent number: 9754742Abstract: A gas circuit breaker includes a driving side electrode having a driving side main contact and a driving side arc contact, and a driven side electrode having a driven side main contact and a driven side arc contact in a sealed tank. The driving side electrode is connected to an operation device. The driven side electrode is coupled to a bidirectional driving mechanism unit. A sliding guide, on which the driven side main contact slides, is provided on an inner periphery side of the driven side main contact. The driven side main contact is energized by a coil spring in a direction of the sliding guide and has two contact surfaces. Only during normal conduction, one of the contact surfaces contacts a projected portion of the sliding guide and the other of the contact surfaces contacts the driving side main contact.Type: GrantFiled: August 22, 2016Date of Patent: September 5, 2017Assignee: Hitachi, Ltd.Inventors: Masanao Terada, Katsuhiko Shiraishi, Yoichi Oshita
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Patent number: 9673005Abstract: The invention provides a switchgear that is capable of increasing a degree of freedom of a position of a moving arcing contact in a circuit breaker, does not require dimension management of components and a mechanism for adjusting a position of the moving arcing contact, and is capable of simplifying fabrication of components and assembly of devices and reducing cost.Type: GrantFiled: October 2, 2014Date of Patent: June 6, 2017Assignee: Hitachi, Ltd.Inventors: Hisashi Urasaki, Makoto Hirose, Masataka Sasaki, Yoichi Oshita, Yasuaki Aoyama
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Patent number: 9620315Abstract: Provided is a gas circuit breaker that can reduce control energy smaller than that in previous double motion systems and an excessive force applied to a moveable pin to achieve a highly reliable double motion system. A gas circuit breaker has a double motion mechanism unit including a driving-side connecting rod, a driven-side connecting rod, a lever to connect the rods, and a guide to define the motion of the driving-side and driven-side connecting rods. A moveable pin extends through a first grooved cam of the driving-side conencting rod, a second grooved cam of the guide, and a third grooved cam of the lever. The driving-side connecting rod operates to move the moveable pin inside the grooved cams. Thus, the lever is rotated, the driven-side connecting rod is driven opposite to the driving-side connecting rod, and the driven-side arcing contact is driven opposite to the driving-side arcing contact.Type: GrantFiled: May 26, 2014Date of Patent: April 11, 2017Assignee: Hitachi, Ltd.Inventors: Masanao Terada, Hajime Urai, Katsuhiko Shiraishi, Yoichi Oshita, Hiroaki Hashimoto, Noriyuki Yaginuma
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Publication number: 20170062157Abstract: A gas circuit breaker includes a driving side electrode having a driving side main contact and a driving side arc contact, and a driven side electrode having a driven side main contact and a driven side arc contact in a sealed tank. The driving side electrode is connected to an operation device. The driven side electrode is coupled to a bidirectional driving mechanism unit. A sliding guide, on which the driven side main contact slides, is provided on an inner periphery side of the driven side main contact. The driven side main contact is energized by a coil spring in a direction of the sliding guide and has two contact surfaces. Only during normal conduction, one of the contact surfaces contacts a projected portion of the sliding guide and the other of the contact surfaces contacts the driving side main contact.Type: ApplicationFiled: August 22, 2016Publication date: March 2, 2017Inventors: Masanao TERADA, Katsuhiko SHIRAISHI, Yoichi OSHITA
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Patent number: 9520699Abstract: An object is to provide a switchgear having a simple structure. To solve the problem, a switchgear according to the invention is characterized by having a fixed side electrode 3, a movable side electrode 4 configured to come into contact with or separate from the fixed side electrode 3, and an operating mechanism configured to allow drive force for movement of the movable side electrode 4 to be generated, wherein the operating mechanism for operating the movable side electrode 4 includes one operating mechanism, and the one operating mechanism allows the movable side electrode 4 to stop at three or more positions.Type: GrantFiled: March 27, 2013Date of Patent: December 13, 2016Assignee: Hitachi, Ltd.Inventors: Hajime Urai, Yasuaki Aoyama, Hiroaki Hashimoto, Tatsuro Kato, Ayumu Morita, Toshiaki Rokunohe, Yoichi Oshita
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Publication number: 20160268076Abstract: The invention provides a switchgear that is capable of increasing a degree of freedom of a position of a moving arcing contact in a circuit breaker, does not require dimension management of components and a mechanism for adjusting a position of the moving arcing contact, and is capable of simplifying fabrication of components and assembly of devices and reducing cost.Type: ApplicationFiled: October 2, 2014Publication date: September 15, 2016Applicant: Hitachi, Ltd.Inventors: Hisashi URASAKI, Makoto HIROSE, Masataka SASAKI, Yoichi OSHITA, Yasuaki AOYAMA
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Publication number: 20160203927Abstract: Provided is a gas circuit breaker that can reduce control energy smaller than that in previous double motion systems and an excessive force applied to a moveable pin to achieve a highly reliable double motion system. A gas circuit breaker has a double motion mechanism unit including a driving-side connecting rod, a driven-side connecting rod, a lever to connect the rods, and a guide to define the motion of the driving-side and driven-side connecting rods. A moveable pin extends through a first grooved cam of the driving-side conencting rod, a second grooved cam of the guide, and a third grooved cam of the lever. The driving-side connecting rod operates to move the moveable pin inside the grooved cams. Thus, the lever is rotated, the driven-side connecting rod is driven opposite to the driving-side connecting rod, and the driven-side arcing contact is driven opposite to the driving-side arcing contact.Type: ApplicationFiled: May 26, 2014Publication date: July 14, 2016Applicant: HITACHI, LTD.Inventors: Masanao TERADA, Hajime URAI, Katsuhiko SHIRAISHI, Yoichi OSHITA, Hiroaki HASHIMOTO, Noriyuki YAGINUMA
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Publication number: 20150131207Abstract: An object is to provide a switchgear having a simple structure. To solve the problem, a switchgear according to the invention is characterized by having a fixed side electrode 3, a movable side electrode 4 configured to come into contact with or separate from the fixed side electrode 3, and an operating mechanism configured to allow drive force for movement of the movable side electrode 4 to be generated, wherein the operating mechanism for operating the movable side electrode 4 includes one operating mechanism, and the one operating mechanism allows the movable side electrode 4 to stop at three or more positions.Type: ApplicationFiled: March 27, 2013Publication date: May 14, 2015Inventors: Hajime Urai, Yasuaki Aoyama, Hiroaki Hashimoto, Tatsuro Kato, Ayumu Morita, Toshiaki Rokunohe, Yoichi Oshita
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Publication number: 20150091677Abstract: An object is to provide a gas circuit breaker having improved reliability. To solve the above-described problem, a gas circuit breaker is characterized by having a fixed contact, a movable contact configured to come into contact with or separate from the fixed contact, an insulating enclosure internally having the fixed contact and the movable contact, the inside of the insulating enclosure being filled with an insulating gas, and an operating mechanism configured to allow drive force for movement of the movable contact to be generated, wherein the operating mechanism includes a mover including permanent magnets or magnetic bodies disposed in a direction along which the operating mechanism allows the drive force to be generated, and a magnetic pole disposed to be opposed to the mover, and having a winding.Type: ApplicationFiled: March 27, 2013Publication date: April 2, 2015Inventors: Hajime Urai, Yasuaki Aoyama, Hiroaki Hashimoto, Katsuhiko Shiraishi, Tatsuro Kato, Ayumu Morita, Toshiaki Rokunohe, Yoichi Oshita