Patents by Inventor Seiichi Kihara
Seiichi Kihara 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: 11993918Abstract: A cable support device (14) for supporting an intermediate part of a power supply cable (13) is provided with a cable stand (16) attached to an upper revolving structure (3), an arm member (19) that is rotatably attached to the cable stand (16) to grip the power supply cable (13) on the tip end side and, and a locking mechanism (25) that is removably disposed in the cable stand (16) and in the arm member (19) to prohibit rotation of the arm member (19) relative to the cable stand (16). Thereby, the rotation of the arm member (19) relative to the cable stand (16) is prohibited by the locking mechanism (25), making it possible to prevent the power feeding cable (13) retained in the arm member (19) from contacting a cab (6).Type: GrantFiled: March 16, 2021Date of Patent: May 28, 2024Assignee: Hitachi Construction Machinery Tierra Co., Ltd.Inventors: Yuuta Furukawa, Hiroyuki Andou, Seiichi Kihara, Kiwamu Takahashi
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Patent number: 11668074Abstract: To reduce an increase in the electric power consumption of an electric motor according to the state of an electric power source at the start of driving of an actuator, and make it possible to use devices in an appropriate state in an electrically driven hydraulic construction machine including a driving system that drives a hydraulic pump by using the electric motor.Type: GrantFiled: September 14, 2020Date of Patent: June 6, 2023Assignee: Hitachi Construction Machinery Tierra Co., Ltd.Inventors: Yuichi Ogawa, Takeshi Ishii, Seiichi Kihara, Kiwamu Takahashi
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Publication number: 20230128121Abstract: A cable support device (14) for supporting an intermediate part of a power supply cable (13) is provided with a cable stand (16) attached to an upper revolving structure (3), an arm member (19) that is rotatably attached to the cable stand (16) to grip the power supply cable (13) on the tip end side and, and a locking mechanism (25) that is removably disposed in the cable stand (16) and in the arm member (19) to prohibit rotation of the arm member (19) relative to the cable stand (16). Thereby, the rotation of the arm member (19) relative to the cable stand (16) is prohibited by the locking mechanism (25), making it possible to prevent the power feeding cable (13) retained in the arm member (19) from contacting a cab (6).Type: ApplicationFiled: March 16, 2021Publication date: April 27, 2023Inventors: Yuuta FURUKAWA, Hiroyuki ANDOU, Seiichi KIHARA, Kiwamu TAKAHASHI
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Patent number: 11542680Abstract: An electric hydraulic excavator (1) includes an automotive lower traveling structure (2) and an upper revolving structure (3) mounted on the lower traveling structure (2) to be capable of revolving thereto. The upper revolving structure (3) includes a revolving frame (5) as a base, a counterweight (13) disposed on a rear side of the revolving frame (5), and an electric power source (9) that is positioned on a front side of the counterweight (13) to be mounted on the revolving frame (5) and is power-fed from an external electric current source. The counterweight (13) is provided with a cable insertion hole (16) as disposed therein. A power feeding cable (12) is inserted in the cable insertion hole (16) for connection between the external electric current source and the electric power source (9).Type: GrantFiled: January 29, 2020Date of Patent: January 3, 2023Assignee: Hitachi Construction Machinery Tierra Co., Ltd.Inventors: Seiichi Kihara, Kiwamu Takahashi, Takeshi Ishii
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Publication number: 20220341126Abstract: It is made possible to perform power reduction control during non-operation of control levers, suppress a return to a normal power state when a control lever is accidentally moved, and make a smooth transition to an operation desired to be performed when a return is made to the normal power state. To this end, in a power reduction state, when a first cancellation condition in which two or more control levers are inclined simultaneously is satisfied or when a second cancellation condition in which one lever continues to be inclined is satisfied, a controller 50 determines that an operator “has an intention of canceling power reduction” and cancels power reduction control.Type: ApplicationFiled: September 24, 2020Publication date: October 27, 2022Inventors: Yuichi OGAWA, Takeshi ISHII, Seiichi KIHARA, Kiwamu TAKAHASHI
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Publication number: 20220290410Abstract: To reduce an increase in the electric power consumption of an electric motor according to the state of an electric power source at the start of driving of an actuator, and make it possible to use devices in an appropriate state in an electrically driven hydraulic construction machine including a driving system that drives a hydraulic pump by using the electric motor.Type: ApplicationFiled: September 14, 2020Publication date: September 15, 2022Inventors: Yuichi OGAWA, Takeshi ISHII, Seiichi KIHARA, Kiwamu TAKAHASHI
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Publication number: 20220290403Abstract: It is made possible to perform power reduction control during non-operation of control levers, and suppress power consumption of a power source when a control lever is moved by an erroneous operation, and thus reduce energy consumption. Accordingly, a controller 50 performs the power reduction control when a non-operation time exceeds a set time after a transition is made from a state in which at least one control lever is operated to a non-operation state in which none of the control levers is operated, and the controller 50 cancels the power reduction control when at least one control lever is operated in a state in which the power reduction control is performed.Type: ApplicationFiled: March 26, 2020Publication date: September 15, 2022Inventors: Yuichi OGAWA, Takeshi ISHII, Seiichi KIHARA, Kiwamu TAKAHASHI
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Publication number: 20220259818Abstract: An upper revolving structure (4) of an electric hydraulic excavator (1) includes a revolving frame (7), an operator's seat (10), an electric motor (15), a hydraulic pump (17) driven by the electric motor (15), an oil tank (18), and an exterior cover (20) disposed in the revolving frame (7) to cover electrical equipment including the electric motor (15) and hydraulic equipment including the hydraulic pump (17) and the oil tank (18). A partitioning member (25) that is disposed in the revolving frame (7) to partition an inside of the exterior cover (20) into an electrical equipment room (28) and a hydraulic equipment room (29). An electrical equipment cooling device (31) including an electrical equipment cooling fan (34) is disposed in the electrical equipment room (28), and a hydraulic equipment cooling device (35) including a hydraulic equipment cooling fan (37) is disposed in the hydraulic equipment room (29).Type: ApplicationFiled: March 26, 2020Publication date: August 18, 2022Inventors: Yuta FURUKAWA, Seiichi KIHARA, Kiwamu TAKAHASHI
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Publication number: 20220259821Abstract: In a hydraulic drive system used for an electrically driven hydraulic work machine that drives a hydraulic pump by an electric motor and supplies a hydraulic fluid to plural actuators to carry out work, the power consumption of the hydraulic pump is kept from exceeding a value decided in advance. For this purpose, a controller calculates target power to be consumed by the hydraulic pump on the basis of the capacity of the hydraulic pump, the delivery pressure of the hydraulic pump sensed by a pressure sensor, and a target revolution speed of the electric motor, and limits the target revolution speed of the electric motor in such a manner that the target power falls within a range of the maximum allowable power.Type: ApplicationFiled: September 24, 2019Publication date: August 18, 2022Inventors: Kiwamu TAKAHASHI, Seiichi KIHARA, Yuichi OGAWA, Takeshi ISHII
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Publication number: 20210254305Abstract: An electric hydraulic excavator (1) includes an automotive lower traveling structure (2) and an upper revolving structure (3) mounted on the lower traveling structure (2) to be capable of revolving thereto. The upper revolving structure (3) includes a revolving frame (5) as a base, a counterweight (13) disposed on a rear side of the revolving frame (5) , and an electric power source (9) that is positioned on a front side of the counterweight (13) to be mounted on the revolving frame (5) and is power-fed from an external electric current source. The counterweight (13) is provided with a cable insertion hole (16) as disposed therein. A power feeding cable (12) is inserted in the cable insertion hole (16) for connection between the external electric current source and the electric power source (9).Type: ApplicationFiled: January 29, 2020Publication date: August 19, 2021Inventors: Seiichi KIHARA, Kiwamu TAKAHASHI, Takeshi ISHII
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Patent number: D684598Type: GrantFiled: November 8, 2012Date of Patent: June 18, 2013Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Shigehisa Hagura, Tomoyuki Miyata, Kazuhiko Hiraoka, Akira Saito, Teruo Irino, Makoto Motozu, Seiichi Kihara, Tomoyuki Tanaka
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Patent number: D684603Type: GrantFiled: November 8, 2012Date of Patent: June 18, 2013Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Shigehisa Hagura, Kazuhiko Hiraoka, Tomoyuki Miyata, Akira Saito, Makoto Motozu, Seiichi Kihara, Yuuki Umizaki
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Patent number: D684606Type: GrantFiled: November 8, 2012Date of Patent: June 18, 2013Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Shigehisa Hagura, Tomoyuki Miyata, Teruo Irino, Makoto Motozu, Seiichi Kihara
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Patent number: D686642Type: GrantFiled: November 8, 2012Date of Patent: July 23, 2013Assignee: Hitachi Construction Machinery Co., Ltd.Inventors: Kohei Urase, Katsuhiro Sasaki, Makoto Motozu, Yuuki Umizaki, Seiichi Kihara