Patents by Inventor Kousei Yokoyama

Kousei Yokoyama 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: 9748534
    Abstract: When a battery pack is mounted to a battery attachment part, the battery pack is slid in a horizontal direction (a direction substantially perpendicular to an upper-lower direction) with respect to the housing, e.g., along a long longitudinal direction of a battery-side rail part, such that tool-side rail parts of the battery attachment part are introduced into engaging recess portions of the battery pack. Thereby, the elastic members are fitted and compressed in the battery-side rail parts and the tool-side rail parts, so that the elastic members press upwards the battery-side rail part (e.g., the battery pack) and press downwards the tool-side rail parts (e.g., the housing). That is, the elastic members press the battery pack and the housing such that they come close to each other.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: August 29, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Hiroyuki Hanawa, Shota Takeuchi, Yoshihiro Nakano, Itsushi Ogawa, Kousei Yokoyama
  • Publication number: 20140294483
    Abstract: When a battery pack is mounted to a battery attachment part, the battery pack is slid in a horizontal direction (a direction substantially perpendicular to an upper-lower direction) with respect to the housing, e.g., along a long longitudinal direction of a battery-side rail part, such that tool-side rail parts of the battery attachment part are introduced into engaging recess portions of the battery pack. Thereby, the elastic members are fitted and compressed in the battery-side rail parts and the tool-side rail parts, so that the elastic members press upwards the battery-side rail part (e.g., the battery pack) and press downwards the tool-side rail parts (e.g., the housing). That is, the elastic members press the battery pack and the housing such that they come close to each other.
    Type: Application
    Filed: February 18, 2014
    Publication date: October 2, 2014
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Hiroyuki Hanawa, Shota Takeuchi, Yoshihiro Nakano, Itsushi Ogawa, Kousei Yokoyama
  • Patent number: 8684106
    Abstract: A battery pack 10 includes a housing 11, a group of cells 12, a board 13, a plurality of second terminals 14, and a cover 15. An opening 16c is formed in the housing 11. The board 13 has a terminal arranging part 13A. A plurality of the second terminals 14 are arranged on the terminal arranging part 13A of the board 13. The cover 15 has a plate-like shape, and covers an area of the board 13 which is positioned between the terminal arranging part 13A and the opening 16c.
    Type: Grant
    Filed: September 9, 2010
    Date of Patent: April 1, 2014
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Hiroyuki Hanawa, Kousei Yokoyama, Keita Saitou
  • Patent number: 8198835
    Abstract: A power tool, having attached thereto a battery device including one or a plurality of cell assemblies, includes a motor which is supplied with a DC current from the battery device, a switching element which controls a drive and a stop of the motor, means which detects a number of cell assemblies, and control means which controls the switching element in such a way as to stop the drive of the motor when the number of cell assemblies is smaller than a prescribed value.
    Type: Grant
    Filed: February 28, 2007
    Date of Patent: June 12, 2012
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Kousei Yokoyama, Kazuhiko Funabashi, Katsuhiro Oomori
  • Publication number: 20110005793
    Abstract: A battery pack 10 includes a housing 11, a group of cells 12, a board 13, a plurality of second terminals 14, and a cover 15. An opening 16c is formed in the housing 11. The board 13 has a terminal arranging part 13A. A plurality of the second terminals 14 are arranged on the terminal arranging part 13A of the board 13. The cover 15 has a plate-like shape, and covers an area of the board 13 which is positioned between the terminal arranging part 13A and the opening 16c.
    Type: Application
    Filed: September 9, 2010
    Publication date: January 13, 2011
    Applicant: HTIACHI KOKI CO., LTD.
    Inventors: Hiroyuki Hanawa, Kousei Yokoyama, Keita Saitou
  • Patent number: 7807293
    Abstract: A battery pack (10) includes a housing (11), a group of cells (12), a board (13), a plurality of second terminals (14), and a cover (15). An opening (16c) is formed in the housing (11). The board (13) has a terminal arranging part (13A). A plurality of the second terminals (14) are arranged on the terminal arranging part (13A) of the board (13). The cover (15) has a plate-like shape, and covers an area of the board (13) which is positioned between the terminal arranging part (13A) and the opening (16c).
    Type: Grant
    Filed: September 7, 2007
    Date of Patent: October 5, 2010
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Hiroyuki Hanawa, Kousei Yokoyama, Keita Saitou
  • Publication number: 20100112435
    Abstract: A battery pack (10) includes a housing (11), a group of cells (12), a board (13), a plurality of second terminals (14), and a cover (15). An opening (16c) is formed in the housing (11). The board (13) has a terminal arranging part (13A). A plurality of the second terminals (14) are arranged on the terminal arranging part (13A) of the board (13). The cover (15) has a plate-like shape, and covers an area of the board (13) which is positioned between the terminal arranging part (13A) and the opening (16c).
    Type: Application
    Filed: September 7, 2007
    Publication date: May 6, 2010
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Hiroyuki Hanawa, Kousei Yokoyama, Keita Saitou
  • Publication number: 20090237012
    Abstract: A power tool, having attached thereto a battery device including one or a plurality of cell assemblies, includes a motor which is supplied with a DC current from the battery device, a switching element which controls a drive and a stop of the motor, means which detects a number of cell assemblies, and control means which controls the switching element in such a way as to stop the drive of the motor when the number of cell assemblies is smaller than a prescribed value.
    Type: Application
    Filed: February 28, 2007
    Publication date: September 24, 2009
    Inventors: Kousei Yokoyama, Kazuhiko Funabashi, Katsuhiro Oomori