Patents by Inventor Yoshikazu Yokoyama

Yoshikazu 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).

  • Publication number: 20240135807
    Abstract: The in-vehicle device mounted on the vehicle includes a control unit having a function of acquiring traffic congestion information for each lane on a road having a plurality of lanes and guiding the vehicle to another lane based on the acquired traffic congestion information, and when the vehicle travels in a predetermined section from the exit in a first lane connected to the exit from the road, the control unit cancels the function.
    Type: Application
    Filed: August 10, 2023
    Publication date: April 25, 2024
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshinori YOKOYAMA, Yoshikazu TOYAMA
  • Patent number: 11926011
    Abstract: A powered tool includes a housing, a drive source, a drive body, a sealing part, and a holding part. The drive source is rotatable in the housing. The drive body is supported in the housing and reciprocatable by a driving force of the drive source. The sealing part is in contact with an outer peripheral surface of the drive body. The holding part is positioned around the drive body. The holding part surrounds the sealing part and supports the sealing part to be in contact with the outer peripheral surface of the drive body. The holding part includes a lubrication oil accommodating part retaining a lubricant supplied to the outer peripheral surface of the drive body.
    Type: Grant
    Filed: April 12, 2019
    Date of Patent: March 12, 2024
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Ryosuke Nakano, Yoshikazu Yokoyama
  • Patent number: 11780071
    Abstract: There is provided a power tool in which impact applied to a power transmission portion can be mitigated to thereby suppress components constituting the power transmission portion from being deformed and damaged. The power tool includes a brushless motor 3 having a rotation shaft portion 31 rotatable about a rotation axis A1, a housing 2 accommodating therein the brushless motor 3, a power transmission portion 6 configured to receive a rotation force of the rotation shaft portion 31 and to transmit a driving force based on the rotation force, and a driven portion 7 configured to be driven by receiving the transmitted driving force. The rotation shaft portion 31 is supported by the housing 2 so as to be movable relative to the housing 2 in an axial direction of the rotation axis A1.
    Type: Grant
    Filed: November 30, 2018
    Date of Patent: October 10, 2023
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Yasutaka Shimizu, Yoshikazu Yokoyama, Naoki Tadokoro, Ryosuke Nakano
  • Publication number: 20220072638
    Abstract: A front grease retention unit is provided under a front plunger and a wall is provided between the retention unit and a gear accommodation unit. Furthermore, a front grease receiving member is provided under the front plunger and a front metal bearing, and grease falling into the front grease receiving member is sent toward the outer circumferential face of the front plunger. The grease is pushed out by using the vertical oscillation of a front metal anchor bolt in orbital mode. A rear grease receiving member is provided under a rear plunger and a rear metal bearing, and grease falling into the rear grease receiving member is sent toward the outer circumferential face of the rear plunger. The grease in a grease reservoir groove is pushed out by using the vertical oscillation of a rear metal anchor bolt in orbital mode.
    Type: Application
    Filed: November 29, 2019
    Publication date: March 10, 2022
    Applicant: Koki Holdings Co., Ltd.
    Inventors: Ryosuke NAKANO, Yoshikazu YOKOYAMA, Ken INUI
  • Publication number: 20210252657
    Abstract: A powered tool includes a housing, a drive source, a drive body, a sealing part, and a holding part. The drive source is rotatable in the housing. The drive body is supported in the housing and reciprocatable by a driving force of the drive source. The sealing part is in contact with an outer peripheral surface of the drive body. The holding part is positioned around the drive body. The holding part surrounds the sealing part and supports the sealing part to be in contact with the outer peripheral surface of the drive body. The holding part includes a lubrication oil accommodating part retaining a lubricant supplied to the outer peripheral surface of the drive body.
    Type: Application
    Filed: April 12, 2019
    Publication date: August 19, 2021
    Applicant: KOKI HOLDINGS CO., LTD.
    Inventors: Ryosuke NAKANO, Yoshikazu YOKOYAMA
  • Publication number: 20210187722
    Abstract: There is provided a power tool in which impact applied to a power transmission portion can be mitigated to thereby suppress components constituting the power transmission portion from being deformed and damaged. The power tool includes a brushless motor 3 having a rotation shaft portion 31 rotatable about a rotation axis A1, a housing 2 accommodating therein the brushless motor 3, a power transmission portion 6 configured to receive a rotation force of the rotation shaft portion 31 and to transmit a driving force based on the rotation force, and a driven portion 7 configured to be driven by receiving the transmitted driving force. The rotation shaft portion 31 is supported by the housing 2 so as to be movable relative to the housing 2 in an axial direction of the rotation axis A1.
    Type: Application
    Filed: November 30, 2018
    Publication date: June 24, 2021
    Applicant: KOKI HOLDINGS CO., LTD.
    Inventors: Yasutaka SHIMIZU, Yoshikazu YOKOYAMA, Naoki TADOKORO, Ryosuke NAKANO
  • Patent number: 9144923
    Abstract: Front feet are provided at a lower part of a cutting-machine main body via a foot holder. Furthermore, a slider positioned on a front side relative to the front feet is provided at the lower part. When a workpiece to be cut is to be cut by a blade, the cutting-machine main body is tilted so as to let the blade go down. When the cutting-machine main body is tilted, a state where the front feet are in contact with the workpiece is switched to a state where the slider is in contact with the workpiece. Then, by moving the cutting-machine main body forward while sliding the slider on the workpiece, the workpiece is cut by the blade. In the cutting operation, the front feet can get away from the workpiece. Therefore, damage of the front feet can be prevented, and the running cost can be suppressed.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: September 29, 2015
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Yoshikazu Yokoyama, Yasuoki Kawahata
  • Patent number: 8984710
    Abstract: A blower apparatus includes: a housing has a discharge port for discharging an air current generated by a fan; and an air conveying tube which includes a plurality of tubular members including first and second tubular members which are connected to each other and which guides the air current discharged from the discharge port in a predetermined direction. The first tubular member includes an outer circumferential surface which is formed so as to gradually decrease in diameter. The second tubular member includes an inner circumferential surface which is formed so as to gradually increase in diameter. The first and second tubular members are connected to each other through the outer circumferential surface and the inner circumferential surface. One of the tubular members which is connected to the housing is configured to be connected to the housing at a plurality of rotational positions about an axis of the tubular member.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: March 24, 2015
    Assignee: Hitachi Koki Co., Ltd.
    Inventor: Yoshikazu Yokoyama
  • Publication number: 20120073080
    Abstract: A blower apparatus includes: a housing has a discharge port for discharging an air current generated by a fan; and an air conveying tube which includes a plurality of tubular members including first and second tubular members which are connected to each other and which guides the air current discharged from the discharge port in a predetermined direction. The first tubular member includes an outer circumferential surface which is formed so as to gradually decrease in diameter. The second tubular member includes an inner circumferential surface which is formed so as to gradually increase in diameter. The first and second tubular members are connected to each other through the outer circumferential surface and the inner circumferential surface. One of the tubular members which is connected to the housing is configured to be connected to the housing at a plurality of rotational positions about an axis of the tubular member.
    Type: Application
    Filed: September 20, 2011
    Publication date: March 29, 2012
    Applicant: Hitachi Koki Co., Ltd.
    Inventor: Yoshikazu Yokoyama
  • Patent number: 6909207
    Abstract: In an inexpensive electric tool, a thin insulating layer is provided by pouring an insulating resin material by the injection molding to extend from a rotor supporting portion 1a formed in an outer casing to an inner surface or inner and outer surfaces of the outer casing. Also, as another configuration and method, an insulating piece 12a for covering the inner surface of the rotor supporting portion is provided, and also an insulating block for covering the rotor supporting portion and supporting ribs is provided.
    Type: Grant
    Filed: April 29, 2002
    Date of Patent: June 21, 2005
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Tomoya Ikeda, Nobuhito Hosokawa, Yoshikazu Yokoyama
  • Patent number: 6863135
    Abstract: Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission key 7 composed of high-strength plastic is provided between an output shaft 3 and a gear 4, and a plane or a V-groove is formed on each of the output shaft 3 and the gear 4 contacting the power transmission key 7.
    Type: Grant
    Filed: August 28, 2003
    Date of Patent: March 8, 2005
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Junichi Kamimura, Mitsuo Ogura, Mitsuyuki Ishikawa, Yoshimitsu Kawasaki, Juurou Kobayashi, Naoya Eto, Hiroto Inagawa, Takuhiro Murakami, Satsuo Sato, Yoshikazu Yokoyama
  • Publication number: 20040040399
    Abstract: Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission key 7 composed of high-strength plastic is provided between an output shaft 3 and a gear 4, and a plane or a V-groove is formed on each of the output shaft 3 and the gear 4 contacting the power transmission key 7.
    Type: Application
    Filed: August 28, 2003
    Publication date: March 4, 2004
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Junichi Kamimura, Mitsuo Ogura, Mitsuyuki Ishikawa, Yoshimitsu Kawasaki, Juurou Kobayashi, Naoya Eto, Hiroto Inagawa, Takuhiro Murakami, Satsuo Sato, Yoshikazu Yokoyama
  • Patent number: 6619410
    Abstract: Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission key 7 composed of high-strength plastic is provided between an output shaft 3 and a gear 4, and a plane or a V-groove is formed on each of the output shaft 3 and the gear 4 contacting the power transmission key 7.
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: September 16, 2003
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Junichi Kamimura, Mitsuo Ogura, Mitsuyuki Ishikawa, Yoshimitsu Kawasaki, Juurou Kobayashi, Naoya Eto, Hiroto Inagawa, Takuhiro Murakami, Satsuo Sato, Yoshikazu Yokoyama
  • Publication number: 20030107273
    Abstract: In an inexpensive electric tool, a thin insulating layer is provided by pouring an insulating resin material by the injection molding to extend from a rotor supporting portion 1a formed in an outer casing to an inner surface or inner and outer surfaces of the outer casing. Also, as another configuration and method, an insulating piece 12a for covering the inner surface of the rotor supporting portion is provided, and also an insulating block for covering the rotor supporting portion and supporting ribs is provided.
    Type: Application
    Filed: April 29, 2002
    Publication date: June 12, 2003
    Inventors: Tomoya Ikeda, Nobuhito Hosokawa, Yoshikazu Yokoyama
  • Publication number: 20020020540
    Abstract: Disclosed is an electric power tool having a gear mechanism, which reduces a noise by absorbing collision of gears and is resistible to a high torque. A power transmission key 7 composed of high-strength plastic is provided between an output shaft 3 and a gear 4, and a plane or a V-groove is formed on each of the output shaft 3 and the gear 4 contacting the power transmission key 7.
    Type: Application
    Filed: August 6, 2001
    Publication date: February 21, 2002
    Inventors: Junichi Kamimura, Mitsuo Ogura, Mitsuyuki Ishikawa, Yoshimitsu Kawasaki, Juurou Kobayashi, Naoya Eto, Hiroto Inagawa, Takuhiro Murakami, Satsuo Sato, Yoshikazu Yokoyama
  • Patent number: D591916
    Type: Grant
    Filed: April 3, 2008
    Date of Patent: May 5, 2009
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Shingo Kosugi, Masato Sakai, Shinichi Kakefuda, Tomoyuki Kawahara, Yoshikazu Yokoyama, Takahiro Hirai
  • Patent number: D638035
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: May 17, 2011
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Shingo Kosugi, Masanori Okada, Shinichi Kakefuda, Yoshikazu Yokoyama, Jun Kugenuma