Patents by Inventor Kenji Kobori

Kenji Kobori 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: 20150033564
    Abstract: To provide a reciprocating tool capable of reducing noise by a simple and inexpensive configuration. In a reciprocating tool including a motor that is a rotary drive source, and a reciprocating motion converter that converts the rotation of the motor into the reciprocation of a tip tool, the reciprocating motion converter includes an eccentric rotation member that eccentrically rotates, a reciprocating member that is engaged with the eccentric rotation member and reciprocates, and an elastic member provided between the eccentric rotation member and the reciprocating member. Inside the reciprocating member, an intermediate member is provided, and the elastic member is interposed between the intermediate member and the reciprocating member.
    Type: Application
    Filed: August 27, 2012
    Publication date: February 5, 2015
    Inventor: Kenji Kobori
  • Patent number: 8529169
    Abstract: According to the invention, a drilling tool includes: a motor; a transmission drive unit for transmitting a rotation force of the motor to rotate a drill bit; and a dust collector for collecting dust produced from a workpiece drilled by the drill bit, wherein the dust collector is provided with a pierced portion pierced by the drill bit, a dust collection port for sucking the produced dust and its surrounding air, and a blowoff port for blowing air against a vicinity of the piercing drill bit.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: September 10, 2013
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Tomomasa Nishikawa, Kenji Kobori, Tsukasa Suzuura
  • Patent number: 8522519
    Abstract: A lawn mower comprising: a power supply; a chassis for holding the power supply; a fixed shaft attached to the chassis; a rotary blade which is rotatably supported with respect to the fixed shaft; a transmitting portion which transmits rotation of the power supply to the rotary blade; and a fixed blade which is coaxially-arranged with the rotary blade, wherein a distance between the rotary blade and the fixed blade can be varied.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: September 3, 2013
    Assignee: Hitachi Koko Co., Ltd.
    Inventors: Kenji Kobori, Hiroto Inagawa, Tomomasa Nishikawa
  • Patent number: 8342782
    Abstract: According to the invention, a drilling tool includes: a driving source; a transmission drive unit for transmitting a rotation force of the driving source; and a dust collector for collecting dust produced from a workpiece drilled by the end tool and blowing air against the workpiece, wherein a filtering means for filtering the air mixed with the collected dust and a centrifugal fan for taking in the filtered air and sending out the filtered air in a circumferential direction are provided, the centrifugal fan is disposed in a housing formed with an airflow sending port for sending a part of the air taken in to the dust collector and a discharge port for discharging a rest of the air to an outside, and a distance from the airflow sending port to the discharge port in a forward direction in a direction of rotation of the centrifugal fan is longer than the distance from the airflow sending port to the discharge port.
    Type: Grant
    Filed: December 5, 2008
    Date of Patent: January 1, 2013
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Tomomasa Nishikawa, Kenji Kobori, Shingo Yamazaki
  • Publication number: 20120073256
    Abstract: A lawn mower comprising: a power supply; a chassis for holding the power supply; a fixed shaft attached to the chassis; a rotary blade which is rotatably supported with respect to the fixed shaft; a transmitting portion which transmits rotation of the power supply to the rotary blade; and a fixed blade which is coaxially-arranged with the rotary blade, wherein a distance between the rotary blade and the fixed blade can be varied.
    Type: Application
    Filed: September 15, 2011
    Publication date: March 29, 2012
    Inventors: Kenji Kobori, Hiroto Inagawa, Tomomasa Nishikawa
  • Patent number: 7909114
    Abstract: A drilling device includes an end cutting tool, a main housing, a motor, a transmission, and a dust collection unit. The end cutting tool processes a workpiece. The motor is provided in the main housing for generating a torque. The transmission transmits the torque to rotate the end cutting tool. The dust collection unit collects dust generated by the rotation of the end cutting tool. The dust collection unit includes a dust case for accumulating the dust therein. The dust case is detachable from the main housing and has an inlet and an outlet. The inlet and the outlet are oriented in a single direction.
    Type: Grant
    Filed: February 22, 2008
    Date of Patent: March 22, 2011
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Tomomasa Nishikawa, Kenji Kobori
  • Patent number: 7721818
    Abstract: A power tool includes: a power tool main body; a handle holder protruding from the power tool main body; a handle extending in a protruding direction of the handle holder and having an arm portion engaging the handle holder; and an elastic body carried between the power tool main body and the handle. The handle holder has a spherical convex outer circumferential face. The arm portion surrounds the handle holder and has a spherical concave inner circumferential face. The convex outer circumferential face of the handle holder is inserted and fitted into the concave inner circumferential face. The elastic body is carried between the power tool main body and the handle around the outer circumference of the handle holder in a radial direction vertical to a protruding-direction central axis of the handle holder.
    Type: Grant
    Filed: October 28, 2005
    Date of Patent: May 25, 2010
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Hiroto Inagawa, Shinki Ohtsu, Kenji Kobori, Tetsuo Ebata
  • Publication number: 20090148248
    Abstract: According to the invention, a drilling tool includes: a motor; a transmission drive unit for transmitting a rotation force of the motor to rotate a drill bit; and a dust collector for collecting dust produced from a workpiece drilled by the drill bit, wherein the dust collector is provided with a pierced portion pierced by the drill bit, a dust collection port for sucking the produced dust and its surrounding air, and a blowoff port for blowing air against a vicinity of the piercing drill bit.
    Type: Application
    Filed: December 5, 2008
    Publication date: June 11, 2009
    Inventors: Tomomasa Nishikawa, Kenji Kobori, Tsukasa Suzuura
  • Publication number: 20090148246
    Abstract: According to the invention, a drilling tool includes: a driving source; a transmission drive unit for transmitting a rotation force of the driving source; and a dust collector for collecting dust produced from a workpiece drilled by the end tool and blowing air against the workpiece, wherein a filtering means for filtering the air mixed with the collected dust and a centrifugal fan for taking in the filtered air and sending out the filtered air in a circumferential direction are provided, the centrifugal fan is disposed in a housing formed with an airflow sending port for sending a part of the air taken in to the dust collector and a discharge port for discharging a rest of the air to an outside, and a distance from the airflow sending port to the discharge port in a forward direction in a direction of rotation of the centrifugal fan is longer than the distance from the airflow sending port to the discharge port.
    Type: Application
    Filed: December 5, 2008
    Publication date: June 11, 2009
    Inventors: Tomomasa NISHIKAWA, Kenji KOBORI, Shingo YAMAZAKI
  • Publication number: 20080202781
    Abstract: A drilling device includes an end cutting tool, a main housing, a motor, a transmission, and a dust collection unit. The end cutting tool processes a workpiece. The motor is provided in the main housing for generating a torque. The transmission transmits the torque to rotate the end cutting tool. The dust collection unit collects dust generated by the rotation of the end cutting tool. The dust collection unit includes a dust case for accumulating the dust therein. The dust case is detachable from the main housing and having an inlet and an outlet. The inlet and the outlet are oriented in a single direction.
    Type: Application
    Filed: February 22, 2008
    Publication date: August 28, 2008
    Inventors: Tomomasa Nishikawa, Kenji Kobori
  • Publication number: 20060113098
    Abstract: A power tool includes: a power tool main body; a handle holder protruding from the power tool main body; a handle extending in a protruding direction of the handle holder and having an arm portion engaging the handle holder; and an elastic body carried between the power tool main body and the handle. The handle holder has a spherical convex outer circumferential face. The arm portion surrounds the handle holder and has a spherical concave inner circumferential face. The convex outer circumferential face of the handle holder is inserted and fitted into the concave inner circumferential face. The elastic body is carried between the power tool main body and the handle around the outer circumference of the handle holder in a radial direction vertical to a protruding-direction central axis of the handle holder.
    Type: Application
    Filed: October 28, 2005
    Publication date: June 1, 2006
    Inventors: Hiroto Inagawa, Shinki Ohtsu, Kenji Kobori, Tetsuo Ebata