Patents by Inventor Yoshimitsu Kawasaki

Yoshimitsu Kawasaki 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: 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: 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: 5601149
    Abstract: A percussion hammer tool comprises a spindle 1 causing rotation about an axis thereof. The spindle 1 is driven by a motor M. A hammer 3, slidably coupled with the spindle 1, generates a percussion force to rotate and hit an anvil. The anvil is divided into an engaging portion 7 engageable with the hammer 3 and a tip tool holding portion 8 holding a tip tool 16. The engaging portion 7 and the tip tool holding portion 8 are locked with each other. A torque transmitting mechanism 11 makes the engaging portion 7 and the tip tool holding portion 8 displaceable with each other telescopically in an axial direction. A cushion member 10 is provided in a clearance 9a between the engaging portion 7 and the tip tool holding portion 8, thereby transmitting an angular component of the percussion force while absorbing an axial component of the percussion force. An additional cushion member 13 may be interposed between the spindle 1 and the anvil.
    Type: Grant
    Filed: January 25, 1995
    Date of Patent: February 11, 1997
    Assignee: Hitachi Koki Company Limited
    Inventors: Yoshimitsu Kawasaki, Mitsuyuki Ishikawa, Takao Tanabe, Toshiaki Uchida
  • Patent number: 5090606
    Abstract: A combustion gas powered fastener driving tool includes inlet and outlet openings through which the combustion gases are discharged from a combustion chamber. These openings are located above the uppermost driving position (top dead center) of a slidable piston, so that an air and fuel mixture is fully trapped in the combustion chamber until after it is combusted. Since an outflow of the unburnt air and fuel mixture is completely prevented, the rate of fuel consumption of the fastener driving tool is high and there is no danger of accidental explosion of unburned fuel even when the fastener driving tool is used in a badly ventilated working place or site. An electric fan for forcing fresh air into the combustion chamber is disposed outside the cylinder and isolated from high temperatures. The fan is durable in structure and reliable in operation.
    Type: Grant
    Filed: October 26, 1990
    Date of Patent: February 25, 1992
    Assignee: Hitachi Koki Company, Limited
    Inventors: Takuji Torii, Hiromu Utsumi, Shinki Ohtsu, Yo Kawakami, Teruo Suzuki, Yoshimitsu Kawasaki, Toshifumi Kubota, Yoshinori Ishizawa, Tsunehisa Terayama