Patents by Inventor Daisuke Ebisawa
Daisuke Ebisawa 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: 10229799Abstract: A switchgear driving device has a rod coupled to a movable electrode; an operation piston connected to the rod; and an operation cylinder in which an operation piston slides. A main control valve controls the pressure of the hydraulic oil in the operation cylinder. A turning-on pressure accumulation piston slides inside a turning-on pressure accumulation chamber; and a turning-on pressure accumulation spring imparts a driving force to the turning-on pressure accumulation piston to pressurize the hydraulic oil within the turning-on pressure accumulation chamber. A turning-off pressure accumulation piston slides inside a turning-off pressure accumulation chamber. A turning-off pressure accumulation spring imparts a driving force to the turning-off pressure accumulation piston to pressurize the hydraulic oil in the turning-off pressure accumulation chamber.Type: GrantFiled: February 10, 2016Date of Patent: March 12, 2019Assignee: Hitachi, Ltd.Inventors: Shinji Seto, Daisuke Ebisawa, Hiroaki Hashimoto
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Patent number: 10128071Abstract: Disclosed is an abrasion resistant material having low cost and excellent abrasion resistance, a puffer cylinder, and a puffer type gas circuit breaker. The abrasion resistant material includes: a base material which is formed of pure aluminum or aluminum alloy and has an unevenness structure formed on its surface; and an aluminum hydrated oxide film which is formed on the surface of the base material, wherein a surface of the aluminum hydrated oxide film is provided with an unevenness structure which is finer than the unevenness structure of the base material.Type: GrantFiled: September 16, 2015Date of Patent: November 13, 2018Assignee: HITACHI, LTD.Inventors: Masahiko Ono, Makoto Hirose, Daisuke Ebisawa, Hisashi Urasaki
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Publication number: 20180025867Abstract: A switchgear driving device has a rod coupled to a movable electrode; an operation piston connected to the rod; and an operation cylinder in which an operation piston slides. A main control valve controls the pressure of the hydraulic oil in the operation cylinder. A turning-on pressure accumulation piston slides inside a turning-on pressure accumulation chamber; and a turning-on pressure accumulation spring imparts a driving force to the turning-on pressure accumulation piston to pressurize the hydraulic oil within the turning-on pressure accumulation chamber. A turning-off pressure accumulation piston slides inside a turning-off pressure accumulation chamber. A turning-off pressure accumulation spring imparts a driving force to the turning-off pressure accumulation piston to pressurize the hydraulic oil in the turning-off pressure accumulation chamber.Type: ApplicationFiled: February 10, 2016Publication date: January 25, 2018Inventors: Shinji SETO, Daisuke EBISAWA, Hiroaki HASHIMOTO
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Patent number: 9870884Abstract: To provide a gas circuit breaker having a space-saving and highly reliable double motion mechanism with high design freedom. In a double motion mechanism of the gas circuit breaker, a driven side movable pin is communicated with a lever driven side hole cut in the opposite side with respect to a rotation axis of a lever. A round hole through which a driving side movable pin is inserted and an elongate hole through which the driven side movable pin is inserted are cut in the outside of the lever. A position retaining member to suppress rotation of the driving side movable pin about two axes vertical to a pin axis is provided. The driving side movable pin is moved in respective grooved cams with an operation of the driving side rod, to rotate the lever, drive the driven side connecting rod in an opposite direction to the driving side connecting rod, and drive the driven side arcing contact in an opposite direction to the driving side arcing contact.Type: GrantFiled: March 23, 2017Date of Patent: January 16, 2018Assignee: Hitachi, Ltd.Inventors: Masanao Terada, Hajime Urai, Daisuke Ebisawa, Hiroaki Hashimoto, Riichi Nagao
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Publication number: 20170278654Abstract: To provide a gas circuit breaker having a space-saving and highly reliable double motion mechanism with high design freedom. In a double motion mechanism of the gas circuit breaker, a driven side movable pin is communicated with a lever driven side hole cut in the opposite side with respect to a rotation axis of a lever. A round hole through which a driving side movable pin is inserted and an elongate hole through which the driven side movable pin is inserted are cut in the outside of the lever. A position retaining member to suppress rotation of the driving side movable pin about two axes vertical to a pin axis is provided. The driving side movable pin is moved in respective grooved cams with an operation of the driving side rod, to rotate the lever, drive the driven side connecting rod in an opposite direction to the driving side connecting rod, and drive the driven side arcing contact in an opposite direction to the driving side arcing contact.Type: ApplicationFiled: March 23, 2017Publication date: September 28, 2017Inventors: Masanao TERADA, Hajime URAI, Daisuke EBISAWA, Hiroaki HASHIMOTO, Riichi NAGAO
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Publication number: 20170271113Abstract: Disclosed is an abrasion resistant material having low cost and excellent abrasion resistance, a puffer cylinder, and a puffer type gas circuit breaker. The abrasion resistant material includes: a base material which is formed of pure aluminum or aluminum alloy and has an unevenness structure formed on its surface; and an aluminum hydrated oxide film which is formed on the surface of the base material, wherein a surface of the aluminum hydrated oxide film is provided with an unevenness structure which is finer than the unevenness structure of the base material.Type: ApplicationFiled: September 16, 2015Publication date: September 21, 2017Applicant: HITACHI, LTD.Inventors: Masahiko ONO, Makoto HIROSE, Daisuke EBISAWA, Hisashi URASAKI
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Patent number: 9653239Abstract: The present invention includes a wear-resistant material including: a base material formed of pure aluminum or an aluminum alloy having a projection, and a depression in a pit-like shape on a surface thereof; and a coat including a dehydrate of a hydrated oxide of aluminum, the coat being formed on a surface of the base material. Further, the present invention including a method for producing a wear-resistant material including the steps of: forming a hydrated oxide coat of aluminum on a surface of the base material by a chemical conversion coating; and heating the hydrated oxide coat. Further, the present invention also includes a puffer cylinder and a puffer-type gas circuit breaker applied to the above wear-resistant material.Type: GrantFiled: July 18, 2014Date of Patent: May 16, 2017Assignee: Hitachi, Ltd.Inventors: Masahiko Ono, Makoto Hirose, Daisuke Ebisawa, Hisashi Urasaki
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Patent number: 9604881Abstract: The present invention includes a wear-resistant material including: a base material formed of pure aluminum or an aluminum alloy having a finely asperity structure on a surface thereof; and a coat including a hydrated oxide coat of aluminum, the coat being formed on the surface of the base material. Further, the present invention including a puffer cylinder including: a finely asperity structure on an inner-wall surface thereof; and a coat including a hydrated oxide coat of aluminum, the coat being formed on the inner-wall surface of the puffer cylinder. The present invention also includes a puffer-type gas circuit breaker includes the above puffer cylinder.Type: GrantFiled: June 17, 2014Date of Patent: March 28, 2017Assignee: Hitachi, Ltd.Inventors: Masahiko Ono, Makoto Hirose, Daisuke Ebisawa, Hisashi Urasaki
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Patent number: 9425589Abstract: A circuit breaker (33) formed with a sealed tank (4) having a breaker section and an operating mechanism (2) is laterally arranged in a lengthwise direction and is fixed to a frame (1), and above the circuit breaker, main bus containers (11, 12) are provided, substantially orthogonally to an axial direction of the circuit breaker (33). Operating mechanism-side working space (B) and breaker section-side working space (C) are provided respectively above the operating mechanism (2) and the sealed tank (4), and a hand hole (5) is provided on an upper surface of the sealed tank (4). A connecting pin (24) is provided in a link mechanism connecting the operating mechanism (2) and the movable contact (7), and an operating mechanism-side working hole for accessibility to the connecting pin (24) from the operating mechanism-side working space (B) is provided.Type: GrantFiled: July 19, 2013Date of Patent: August 23, 2016Assignee: Hitachi, Ltd.Inventors: Hiroaki Hashimoto, Kenichi Okubo, Daisuke Ebisawa, Makoto Hirose
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Publication number: 20150236485Abstract: A circuit breaker (33) formed with a sealed tank (4) having a breaker section and an operating mechanism (2) is laterally arranged in a lengthwise direction and is fixed to a frame (1), and above the circuit breaker, main bus containers (11, 12) are provided, substantially orthogonally to an axial direction of the circuit breaker (33). Operating mechanism-side working space (B) and breaker section-side working space (C) are provided respectively above the operating mechanism (2) and the sealed tank (4), and a hand hole (5) is provided on an upper surface of the sealed tank (4). A connecting pin (24) is provided in a link mechanism connecting the operating mechanism (2) and the movable contact (7), and an operating mechanism-side working hole for accessibility to the connecting pin (24) from the operating mechanism-side working space (B) is provided.Type: ApplicationFiled: July 19, 2013Publication date: August 20, 2015Inventors: Hiroaki Hashimoto, Kenichi Okubo, Daisuke Ebisawa, Makoto Hirose
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Publication number: 20150060408Abstract: The present invention includes a wear-resistant material including: a base material formed of pure aluminum or an aluminum alloy having a projection, and a depression in a pit-like shape on a surface thereof; and a coat including a dehydrate of a hydrated oxide of aluminum, the coat being formed on a surface of the base material. Further, the present invention including a method for producing a wear-resistant material including the steps of: forming a hydrated oxide coat of aluminum on a surface of the base material by a chemical conversion coating; and heating the hydrated oxide coat. Further, the present invention also includes a puffer cylinder and a puffer-type gas circuit breaker applied to the above wear-resistant material.Type: ApplicationFiled: July 18, 2014Publication date: March 5, 2015Inventors: Masahiko ONO, Makoto HIROSE, Daisuke EBISAWA, Hisashi URASAKI
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Publication number: 20150053074Abstract: The drive device includes: a contact including a moving contact and a stationary contact; a rod connected to the moving contact; a piston which is connected to the rod and is slidably installed in a cylinder and which opens and closes the contact; a fluid pressure source for pressure-feeding a working fluid; and a control valve for driving the piston. In the drive device, the piston forms a partition between a supply pressure chamber communicated with the fluid pressure source and a small pressure-receiving area chamber which are on the moving contact side of the piston and a cylinder control chamber on the opposite side of the piston, and the control valve controls supplying and discharging the working fluid to and from the cylinder control chamber.Type: ApplicationFiled: August 4, 2014Publication date: February 26, 2015Inventors: Shinji SETO, Daisuke EBISAWA
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Publication number: 20140367360Abstract: The present invention includes a wear-resistant material including: a base material formed of pure aluminum or an aluminum alloy having a finely asperity structure on a surface thereof; and a coat including a hydrated oxide coat of aluminum, the coat being formed on the surface of the base material. Further, the present invention including a puffer cylinder including: a finely asperity structure on an inner-wall surface thereof; and a coat including a hydrated oxide coat of aluminum, the coat being formed on the inner-wall surface of the puffer cylinder. The present invention also includes a puffer-type gas circuit breaker includes the above puffer cylinder.Type: ApplicationFiled: June 17, 2014Publication date: December 18, 2014Inventors: Masahiko ONO, Makoto HIROSE, Daisuke EBISAWA, Hisashi URASAKI
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Patent number: 6875941Abstract: Disclosed is a hydraulic operating apparatus for switch with which it is possible to constantly obtain a stable interrupting performance at the time of high-speed successive operations. Closing and interrupting pressure accumulators comprise closing and interrupting pressure accumulation pistons, and closing and interrupting pressure accumulation springs for biasing the closing and interrupting pressure accumulation pistons in pressure accumulation directions, respectively. The closing and interrupting pressure accumulation springs exert, on the closing and interrupting pressure accumulation pistons, forces corresponding to received pressures acting on the closing and interrupting pressure accumulation pistons from closing and interrupting pressure accumulation chambers in a steady state. The closing pressure accumulator and the interrupting pressure accumulator are independently constituted for closing and for interrupting, respectively.Type: GrantFiled: December 30, 2003Date of Patent: April 5, 2005Assignee: Japan AE Power Systems CorporationInventors: Hideo Kawamoto, Daisuke Ebisawa, Kenichi Okubo
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Publication number: 20050006349Abstract: Disclosed is a hydraulic operating apparatus for switch with which it is possible to constantly obtain a stable interrupting performance at the time of high-speed successive operations. Closing and interrupting pressure accumulators comprise closing and interrupting pressure accumulation pistons, and closing and interrupting pressure accumulation springs for biasing the closing and interrupting pressure accumulation pistons in pressure accumulation directions, respectively. The closing and interrupting pressure accumulation springs exert, on the closing and interrupting pressure accumulation pistons, forces corresponding to received pressures acting on the closing and interrupting pressure accumulation pistons from closing and interrupting pressure accumulation chambers in a steady state. The closing pressure accumulator and the interrupting pressure accumulator are independently constituted for closing and for interrupting, respectively.Type: ApplicationFiled: December 30, 2003Publication date: January 13, 2005Inventors: Hideo Kawamoto, Daisuke Ebisawa, Kenichi Okubo
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Patent number: 6815629Abstract: In a hydraulic pressure actuating apparatus for a circuit breaker, contacts of the circuit breaker have a moving contact and a stationary contact for turning on/off current. A shaft, at an end portion of which is attached the moving contact, and at the other end of which is attached a piston, is received within a cylinder. A directional control valve exchanges oil pressure for actuating the piston. For changing over the directional control valve, pilot valves are provided. Each pilot valve has a pair of valve bodies, each opposing to each other, and springs. One of the valve bodies is able to stroke up to contact with the valve body of the other valve body, therefore giving no ill influences upon actuating time, even if drawback occurs in the pilot valves in the hydraulic pressure actuating apparatus for the circuit breaker.Type: GrantFiled: May 16, 2003Date of Patent: November 9, 2004Assignee: Hitachi, Ltd.Inventors: Shinji Seto, Yasuhide Takeda, Daisuke Ebisawa, Masayuki Uchiyama, Atsuji Watanabe, Hideo Kawamoto
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Publication number: 20030213774Abstract: In a hydraulic pressure actuating apparatus for a circuit breaker, contacts of the circuit breaker has a moving contact 2 and a stationary contact 1 for turning on/off current. A shaft, at an end portion of which is attached the moving contact, and at the other end of which is attached a piston 5, is received within a cylinder 4. A directional control valve 13 exchanges oil pressure for actuating the piston. For changing over the directional control valve, pilot valves 50 and 60 are provided. Each pilot valve has a pair of valve bodies 53 and 55 or 63 and 65, each opposing to each other, and springs 54 and 64. One of the valve bodies is able to stroke up to contact with the valve body of the other valve body, therefore giving no ill influences upon actuating time, even if drawback occurs in the pilot valves in the hydraulic pressure actuating apparatus for the circuit breaker.Type: ApplicationFiled: May 16, 2003Publication date: November 20, 2003Applicant: Hitachi, Ltd.Inventors: Shinji Seto, Yasuhide Takeda, Daisuke Ebisawa, Masayuki Uchiyama, Atsuji Watanabe, Hideo Kawamoto