Patents by Inventor Tomohiko Hisakuni
Tomohiko Hisakuni 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: 11850945Abstract: A power supply device for an electric work vehicle, including: a battery by which an electric work vehicle is drivable; a first connection unit for an internal inverter configured to convert DC power from the battery into AC power, and output the AC power to an internal electric device installed in the electric work vehicle; a second connection unit for an external inverter configured to convert DC power from the battery into AC power, and output the AC power to an external electric device; and a battery control unit connected to the first connection unit and the second connection unit, and configured to control charging of, and power supply from, the battery, wherein the battery control unit is configured to communicate with the external inverter side via the second connection unit to perform authentication regarding whether or not power supply to the external inverter is permitted.Type: GrantFiled: June 15, 2022Date of Patent: December 26, 2023Assignee: Kubota CorporationInventors: Takumi Yamamoto, Tomohiko Hisakuni, Masahiro Yamada, Hirokazu Ito
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Patent number: 11770013Abstract: A stand for a charger includes an attachment portion attachable and detachable to and from the charger and a leg portion configured to be capable of supporting the charger with the charger being lifted up off the ground surface when the stand is attached to the charger.Type: GrantFiled: June 3, 2021Date of Patent: September 26, 2023Assignee: Kubota CorporationInventors: Hirokazu Ito, Tomohiko Hisakuni
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Publication number: 20230087889Abstract: A work vehicle capable of traveling on a public road and in a working field includes: a public road traveling determination unit configured to generate vehicle body position information regarding a position at which the vehicle body is located, determine based on the vehicle body position information whether or not the vehicle body is traveling on the public road, and output a determination result; and a vehicle speed limiter configured to limit a vehicle speed in accordance with the determination result.Type: ApplicationFiled: June 15, 2022Publication date: March 23, 2023Inventors: Tomohiko Hisakuni, Masahiro Yamada, Hirokazu Ito
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Publication number: 20230090301Abstract: A power supply device for an electric work vehicle, including: a battery by which an electric work vehicle is drivable; a first connection unit for an internal inverter configured to convert DC power from the battery into AC power, and output the AC power to an internal electric device installed in the electric work vehicle; a second connection unit for an external inverter configured to convert DC power from the battery into AC power, and output the AC power to an external electric device; and a battery control unit connected to the first connection unit and the second connection unit, and configured to control charging of, and power supply from, the battery, wherein the battery control unit is configured to communicate with the external inverter side via the second connection unit to perform authentication regarding whether or not power supply to the external inverter is permitted.Type: ApplicationFiled: June 15, 2022Publication date: March 23, 2023Inventors: Takumi Yamamoto, Tomohiko Hisakuni, Masahiro Yamada, Hirokazu Ito
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Patent number: 11597275Abstract: In a work vehicle, a pivot axis of an operating lever and a rotary axis of a potentiometer are located on a same axis. An interlocking mechanism includes an input part which inputs power of the operating lever following the operating lever about the pivot axis as a pivot, and an output part which is supported to a rotary operation shaft and outputs power of the input part to the rotary operation shaft. The input part and the output part are operably connected via a connecting pin.Type: GrantFiled: October 20, 2020Date of Patent: March 7, 2023Assignee: Kubota CorporationInventors: Masahiro Yamada, Hirokazu Ito, Tomohiko Hisakuni
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Patent number: 11588188Abstract: A battery unit includes a positive relay switch, a negative relay switch, a first resistor disposed in a third wiring portion extending between a positive external terminal and a negative external terminal, a second resistor serially connected to a portion on more negative side than the first resistor, a third resistor disposed in a second wiring portion and connected in parallel with the negative relay switch, a potential difference detection section capable of detecting a first potential difference which is a potential difference between the portion of the third wiring portion on more negative side than the first resistor and a negative terminal and a failure determination section for determining a failure of the positive relay switch and the negative relay switch respectively, based on the first potential difference.Type: GrantFiled: November 11, 2020Date of Patent: February 21, 2023Assignee: Kubota CorporationInventors: Hirokazu Ito, Tomohiko Hisakuni
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Publication number: 20220322601Abstract: An autonomous travel assistant downloads information on the travel control conditions set by a travel control condition setter, and causes a display to show the information on the travel control conditions. A travel manager, in response to an autonomous travel start instruction from the autonomous travel assistant, instructs an autonomous travel controller to start autonomous travel.Type: ApplicationFiled: December 13, 2021Publication date: October 13, 2022Inventors: Yasuhiro Manji, Tomohiko Hisakuni
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Publication number: 20220312668Abstract: A self-driving work vehicle includes: a front wheel unit; a rear wheel unit including a left rear wheel and a right rear wheel; a variable traveling power supply apparatus that supplies rotational drive power to the left rear wheel and the right rear wheel independently; a left operation implement movable along a first path to adjust a rate of the rotational drive power to be supplied to the left rear wheel from the variable traveling power supply apparatus; a right operation implement movable along a second path to adjust a rate of the rotational drive power to be supplied to the right rear wheel from the variable traveling power supply apparatus; a parking brake provided for the variable traveling power supply apparatus; and a controller configured or programmed to cause a parking brake operating module to operate the parking brake.Type: ApplicationFiled: November 19, 2021Publication date: October 6, 2022Inventors: Yasuhiro Manji, Tomohiko Hisakuni
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Publication number: 20220224132Abstract: A stand for a charger includes an attachment portion attachable and detachable to and from the charger and a leg portion configured to be capable of supporting the charger with the charger being lifted up off the ground surface when the stand is attached to the charger.Type: ApplicationFiled: June 3, 2021Publication date: July 14, 2022Inventors: Hirokazu Ito, Tomohiko Hisakuni
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Patent number: 11273716Abstract: An electric work vehicle includes a vehicle body having traveling wheels, a traveling motor capable of driving the traveling wheels, and a battery unit having, at one end portion thereof, a pair of left and right leg wheels, the battery unit being detachably attachable to a battery storage section of the vehicle body and being capable of supplying electric power to the traveling motor. The battery unit, when detached from the battery storage section, is posture-switchable between a flat placement state in which the leg wheels and the other end portion thereof opposite to the side on which the leg wheels are located are placed in contact with the ground surface and a tilted posture in which the battery unit can stand on its own with the other end portion thereof being located higher than the leg wheels.Type: GrantFiled: October 29, 2019Date of Patent: March 15, 2022Assignee: Kubota CorporationInventors: Kazuaki Matsuda, Hirokazu Ito, Masahiro Yamada, Tomohiko Hisakuni
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Publication number: 20210359346Abstract: A battery unit includes a positive relay switch, a negative relay switch, a first resistor disposed in a third wiring portion extending between a positive external terminal and a negative external terminal, a second resistor serially connected to a portion on more negative side than the first resistor, a third resistor disposed in a second wiring portion and connected in parallel with the negative relay switch, a potential difference detection section capable of detecting a first potential difference which is a potential difference between the portion of the third wiring portion on more negative side than the first resistor and a negative terminal and a failure determination section for determining a failure of the positive relay switch and the negative relay switch respectively, based on the first potential difference.Type: ApplicationFiled: November 11, 2020Publication date: November 18, 2021Inventors: Hirokazu Ito, Tomohiko Hisakuni
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Publication number: 20210300179Abstract: In a work vehicle, a pivot axis of an operating lever and a rotary axis of a potentiometer are located on a same axis. An interlocking mechanism includes an input part which inputs power of the operating lever following the operating lever about the pivot axis as a pivot, and an output part which is supported to a rotary operation shaft and outputs power of the input part to the rotary operation shaft. The input part and the output part are operably connected via a connecting pin.Type: ApplicationFiled: October 20, 2020Publication date: September 30, 2021Inventors: Masahiro Yamada, Hirokazu Ito, Tomohiko Hisakuni
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Publication number: 20200290465Abstract: An electric work vehicle includes a vehicle body having traveling wheels, a traveling motor capable of driving the traveling wheels, and a battery unit having, at one end portion thereof, a pair of left and right leg wheels, the battery unit being detachably attachable to a battery storage section of the vehicle body and being capable of supplying electric power to the traveling motor. The battery unit, when detached from the battery storage section, is posture-switchable between a flat placement state in which the leg wheels and the other end portion thereof opposite to the side on which the leg wheels are located are placed in contact with the ground surface and a tilted posture in which the battery unit can stand on its own with the other end portion thereof being located higher than the leg wheels.Type: ApplicationFiled: October 29, 2019Publication date: September 17, 2020Inventors: Kazuaki Matsuda, Hirokazu Ito, Masahiro Yamada, Tomohiko Hisakuni