Patents by Inventor Takuya UMEMURA

Takuya UMEMURA 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).

  • Patent number: 10348110
    Abstract: A battery pack (30) is configured to couple to a power tool (10) by sliding in a sliding direction and it contains a plurality of cells (31). A pair of battery-side, electric-power terminals (312a, 312b, 314a, 314b) and a battery-side signal terminal (313) can be electrically connected to a pair of tool-side, power-supply terminals (212, 214) and a tool-side signal terminal (213), respectively, which are provided on the power tool (10). The pair of battery-side, electric-power terminals (312a, 312b, 314a, 314b) and the battery-side signal terminal (313) are disposed in parallel adjacently in a direction that intersects the sliding direction.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: July 9, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Eiji Kondo, Hironori Ogura, Takuya Umemura, Hideyuki Taga, Yoshihiro Ishikawa
  • Patent number: 10298044
    Abstract: A device body in one aspect of the present disclosure comprises a motor, a current path, a positive terminal, a negative terminal, a device-side signal terminal, a temperature information detector, a current detector, and a correction unit. The correction unit is configured to correct temperature information based on a current value of a conducting current, so as to reduce an influence given to the temperature information by the conducting current.
    Type: Grant
    Filed: June 1, 2016
    Date of Patent: May 21, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Takaaki Ito, Takuya Umemura
  • Publication number: 20190074683
    Abstract: An electrically-driven working apparatus in one aspect of an embodiment of the present disclosure comprises: a battery; an abnormality detection unit; a power supply path; a first disconnection unit; a second disconnection unit; and a control unit. The control unit activates the first disconnection unit to disconnect the power supply path if either of an overload or an over discharge of the battery is detected by the abnormality detection unit, and subsequently determines whether discharge from the battery has stopped after activating the first disconnection unit, and activates the second disconnection unit to disconnect the power supply path if discharge from the battery has not stopped.
    Type: Application
    Filed: November 6, 2018
    Publication date: March 7, 2019
    Applicant: MAKITA CORPORATION
    Inventors: Hiroki UESUGI, Takuya UMEMURA, Takayoshi ENDO, Masafumi NODA
  • Patent number: 10222424
    Abstract: A charge control device of one example of the present invention comprises a temperature detection unit, a storage unit, and an upper limit setting unit. The storage unit stores a reference current characteristic and at least one of a first current characteristic and a second current characteristic as a charging current characteristic, and stores a reference voltage characteristic and at least one of a first voltage characteristic and a second voltage characteristic as a charging voltage characteristic. The upper limit setting unit selects a characteristic used to set upper limits of a charging current and a charging voltage to the battery from among a plurality of the charging current characteristics and a plurality of the charging voltage characteristics stored in the storage unit.
    Type: Grant
    Filed: September 12, 2017
    Date of Patent: March 5, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Takuya Umemura, Tadahiko Kobayakawa, Hitoshi Suzuki
  • Patent number: 10177559
    Abstract: An electrically-driven working apparatus in one aspect of an embodiment of the present disclosure comprises: a battery; an abnormality detection unit; a power supply path; a first disconnection unit; a second disconnection unit; and a control unit. The control unit activates the first disconnection unit to disconnect the power supply path if either of an overload or an over discharge of the battery is detected by the abnormality detection unit, and subsequently determines whether discharge from the battery has stopped after activating the first disconnection unit, and activates the second disconnection unit to disconnect the power supply path if discharge from the battery has not stopped.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: January 8, 2019
    Assignee: MAKITA CORPORATION
    Inventors: Hiroki Uesugi, Takuya Umemura, Takayoshi Endo, Masafumi Noda
  • Patent number: 10124455
    Abstract: A power tool system includes a hand-held power tool having a motor or a solenoid that drives a tool, and a first memory that stores at least one pass code. A battery pack is detachably attached to, and supplies current to, the power tool and has a second memory that stores at least one pass code. An electronically-actuatable lock and a first controller are provided in the power tool and/or in the battery pack. The first controller reads the pass codes from the first and second memories when the battery pack is attached to the power tool, directly compares the pass codes from the first memory and the second memory, and causes the first electronically-actuatable lock to prohibit or impair operation of the power tool when the pass codes do not match or otherwise correspond in a predetermined manner.
    Type: Grant
    Filed: July 19, 2012
    Date of Patent: November 13, 2018
    Assignee: MAKITA CORPORATION
    Inventors: Kosuke Ito, Hitoshi Suzuki, Nobuyasu Furui, Masaaki Fukumoto, Takuya Umemura, Hitoshi Sengiku
  • Patent number: 10090692
    Abstract: A charger for a hand-held power tool includes a power source interface, a charger base and a charging cradle rotatably supported on the charger base. The rotatable charging cradle includes at least two charging output terminals electrically connected to the power source interface. A power tool system includes the charger and the hand-held power tool. A method of charging the power tool system includes contacting charging input terminals of the power tool with the charging output terminals, rotating the charging cradle and the power tool relative to the charging base and supplying charging current to at least one battery cell while the charging cradle and the power tool are allowed to freely swing relative to the charging base.
    Type: Grant
    Filed: January 10, 2017
    Date of Patent: October 2, 2018
    Assignee: MAKITA CORPORATION
    Inventors: Shuji Yoshikawa, Tatsuya Nagahama, Nobuyasu Furui, Hitoshi Suzuki, Masaaki Fukumoto, Takuya Umemura, Kosuke Ito
  • Patent number: 9941553
    Abstract: A battery-connection system in one aspect of the present disclosure comprises a battery pack and a connecting device. The connecting device comprises a temperature-related control unit that is configured to execute a specific temperature-related control in accordance with a detection signal outputted from the battery pack when the battery pack is attached to the connecting device, without identifying a type of a battery in the battery pack.
    Type: Grant
    Filed: February 16, 2016
    Date of Patent: April 10, 2018
    Assignee: MAKITA CORPORATION
    Inventors: Takuya Umemura, Shunpei Yamaji
  • Publication number: 20180076639
    Abstract: A method for recharging a battery pack (40; 40?) includes attaching a portable charger (120) to a user, which portable charger comprises or is attached to a self-contained power supply (130, 140) and wherein a first charging port (132, 146) of the portable charger is disposed, e.g., on a belt (144) worn by the user, hanging the battery pack on the belt while the battery pack is physically engaged and in electrical communication with a power tool (10; 10?), and initiating a transfer of power from the charger to the battery pack when the first charging port is at least proximal to a second charging port (85, 148) that is in electrical communication with at least one battery cell (50) of the battery pack. A portable charging system capable of performing this method, as well as an adapter for use in performing this method, are also disclosed.
    Type: Application
    Filed: August 29, 2017
    Publication date: March 15, 2018
    Inventors: Nobuyasu FURUI, Hitoshi Suzuki, Masaaki FUKUMOTO, Takuya UMEMURA, Kosuke ITO, Hitoshi Sengiku, Shuji Yoshikawa, Tatsuya Nagahama
  • Publication number: 20180003773
    Abstract: A charge control device of one example of the present invention comprises a temperature detection unit, a storage unit, and an upper limit setting unit. The storage unit stores a reference current characteristic and at least one of a first current characteristic and a second current characteristic as a charging current characteristic, and stores a reference voltage characteristic and at least one of a first voltage characteristic and a second voltage characteristic as a charging voltage characteristic. The upper limit setting unit selects a characteristic used to set upper limits of a charging current and a charging voltage to the battery from among a plurality of the charging current characteristics and a plurality of the charging voltage characteristics stored in the storage unit.
    Type: Application
    Filed: September 12, 2017
    Publication date: January 4, 2018
    Applicant: MAKITA CORPORATION
    Inventors: Takuya UMEMURA, Tadahiko KOBAYAKAWA, Hitoshi SUZUKI
  • Patent number: 9819203
    Abstract: An electric power tool system comprises a tool main body, a battery pack detachably attached to the tool main body, and a first charger that charges the battery pack. The first charger comprises a rechargeable battery that supplies current to at least one rechargeable battery of the battery pack. The at least one rechargeable battery of the first charger preferably has a larger charge storage capacity than the at least one rechargeable battery of the battery pack.
    Type: Grant
    Filed: December 13, 2016
    Date of Patent: November 14, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Hitoshi Suzuki, Takuya Umemura
  • Patent number: 9786877
    Abstract: A battery pack of an electric power tool comprises ten lithium-ion cells. The ten lithium-ion cells are connected in series. Each lithium-ion cell has a diameter equal to or less than 18 millimeters, a length equal to or less than 65 millimeters, and an internal resistance equal to or less than 30 milliohms. Because the battery pack has a high voltage in operation and is therefore able to supply large current, the battery pack is preferably configured incapable of being used in a conventional electric power tool that cannot operate under such a large current.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: October 10, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Takuya Umemura, Masaaki Fukumoto, Masafumi Noda
  • Patent number: 9784795
    Abstract: A charge control device of one example of the present invention comprises a temperature detection unit, a storage unit, and an upper limit setting unit. The storage unit stores a reference current characteristic and at least one of a first current characteristic and a second current characteristic as a charging current characteristic, and stores a reference voltage characteristic and at least one of a first voltage characteristic and a second voltage characteristic as a charging voltage characteristic. The upper limit setting unit selects a characteristic used to set upper limits of a charging current and a charging voltage to the battery from among a plurality of the charging current characteristics and a plurality of the charging voltage characteristics stored in the storage unit.
    Type: Grant
    Filed: June 17, 2015
    Date of Patent: October 10, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Takuya Umemura, Tadahiko Kobayakawa, Hitoshi Suzuki
  • Patent number: 9780583
    Abstract: A method for recharging a battery pack includes attaching a portable charger to a user, which portable charger includes or is attached to a self-contained power supply and wherein a first charging port of the portable charger is disposed, e.g., on a belt worn by the user, hanging the battery pack on the belt while the battery pack is physically engaged and in electrical communication with a power tool, and initiating a transfer of power from the charger to the battery pack when the first charging port is at least proximal to a second charging port that is in electrical communication with at least one battery cell of the battery pack. A portable charging system capable of performing this method, as well as an adapter for use in performing this method, are also disclosed.
    Type: Grant
    Filed: July 24, 2012
    Date of Patent: October 3, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Nobuyasu Furui, Hitoshi Suzuki, Masaaki Fukumoto, Takuya Umemura, Kosuke Ito, Hitoshi Sengiku, Shuji Yoshikawa, Tatsuya Nagahama
  • Patent number: 9778321
    Abstract: A charge control device includes a voltage detector that detects a voltage of a battery, a temperature detector that detects a battery temperature, a voltage setting unit that sets at least one of a charge completion voltage and an abnormality determination voltage to a high temperature time voltage that is lower than a normal voltage when the battery temperature detected by the temperature detector is or is above a high temperature determination threshold set in advance, and a charging current limiting unit that reduces a charging current a charger supplies to the battery when the battery temperature is in a temperature range between a set temperature that is lower by a predetermined temperature than the high temperature determination threshold and the high temperature determination threshold and the battery voltage detected by the voltage detector is in a voltage range between the normal voltage and the high temperature time voltage.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: October 3, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Takuya Umemura, Tadahiko Kobayakawa, Hiroki Uesugi, Hiroshi Hanai
  • Patent number: 9748780
    Abstract: An electric power tool system comprises a tool main body, a battery pack detachably attached to the tool main body and a first charger that charges the battery pack. The first charger is detachably attached to the tool main body and/or the battery pack. The first charger is capable of charging the battery pack while the battery pack is attached to the tool main body. The first charger is preferably cordless and contains at least rechargeable battery for storing energy to charge the battery pack.
    Type: Grant
    Filed: October 29, 2014
    Date of Patent: August 29, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Hitoshi Suzuki, Takuya Umemura
  • Publication number: 20170160346
    Abstract: A measurement system according to one aspect of the present invention includes a battery pack and at least one type of connected device to which the pack is connected. The pack includes a first detection device detecting a predetermined physical quantity in the pack and having a predetermined measurement range. The connected device includes a second detection device detecting a physical quantity the same as the predetermined physical quantity and having a measurement range different from the range of the first detection device. One of the pack and the connected device includes a receiving device and a measurement processing device that performs a predetermined measurement process by using one of: a detection-value-related information received by the receiving device; and a detection result by one device of the first detection device and the second detection device, the one device being provided in one of the pack and the connected device.
    Type: Application
    Filed: February 16, 2017
    Publication date: June 8, 2017
    Applicant: MAKITA CORPORATION
    Inventors: Masafumi NODA, Hitoshi SUZUKI, Masaaki FUKUMOTO, Takuya UMEMURA
  • Publication number: 20170126038
    Abstract: A charger for a hand-held power tool includes a power source interface, a charger base and a charging cradle rotatably supported on the charger base. The rotatable charging cradle includes at least two charging output terminals electrically connected to the power source interface. A power tool system includes the charger and the hand-held power tool. A method of charging the power tool system includes contacting charging input terminals of the power tool with the charging output terminals, rotating the charging cradle and the power tool relative to the charging base and supplying charging current to at least one battery cell while the charging cradle and the power tool are allowed to freely swing relative to the charging base.
    Type: Application
    Filed: January 10, 2017
    Publication date: May 4, 2017
    Inventors: Shuji Yoshikawa, Tatsuya Nagahama, Nobuyasu FURUI, Hitoshi Suzuki, Masaaki FUKUMOTO, Takuya UMEMURA, Kosuke ITO
  • Publication number: 20170093188
    Abstract: An electric power tool system comprises a tool main body, a battery pack detachably attached to the tool main body, and a first charger that charges the battery pack. The first charger comprises a rechargeable battery that supplies current to at least one rechargeable battery of the battery pack. The at least one rechargeable battery of the first charger preferably has a larger charge storage capacity than the at least one rechargeable battery of the battery pack.
    Type: Application
    Filed: December 13, 2016
    Publication date: March 30, 2017
    Inventors: Hitoshi SUZUKI, Takuya UMEMURA
  • Patent number: 9606188
    Abstract: A measurement system according to one aspect of the present invention includes a battery pack and at least one type of connected device to which the pack is connected. The pack includes a first detection device detecting a predetermined physical quantity in the pack and having a predetermined measurement range. The connected device includes a second detection device detecting a physical quantity the same as the predetermined physical quantity and having a measurement range different from the range of the first detection device. One of the pack and the connected device includes a receiving device and a measurement processing device that performs a predetermined measurement process by using one of: a detection-value-related information received by the receiving device; and a detection result by one device of the first detection device and the second detection device, the one device being provided in one of the pack and the connected device.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: March 28, 2017
    Assignee: MAKITA CORPORATION
    Inventors: Masafumi Noda, Hitoshi Suzuki, Masaaki Fukumoto, Takuya Umemura