Patents by Inventor Yasuki Ohmori

Yasuki Ohmori 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: 10625407
    Abstract: In order to provide a driving machine which achieves reciprocating movements of a rack using a simple mechanism and is able to smoothly engage and disengage the rack by reducing the friction during engagement and disengagement of the rack, the driving machine is equipped with: a nose that extends in a prescribed direction; a housing that has the nose; a blade that has an engaging section, is movably guided in the housing in the prescribed direction, and is capable of driving a fastener via the nose; and a transmission mechanism that has an engaged section for engaging with the engaging section in order to transmit a driving force, wherein the transmission mechanism has a roller mechanism for guiding the engaging section and engaged section to disengage from each other.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: April 21, 2020
    Assignee: KOKI HOLDINGS CO., LTD.
    Inventors: Shinichirou Sato, Yasuki Ohmori
  • Publication number: 20170190037
    Abstract: In order to provide a driving machine which achieves reciprocating movements of a rack using a simple mechanism and is able to smoothly engage and disengage the rack by reducing the friction during engagement and disengagement of the rack, the driving machine is equipped with: a nose that extends in a prescribed direction; a housing that has the nose; a blade that has an engaging section, is movably guided in the housing in the prescribed direction, and is capable of driving a fastener via the nose; and a transmission mechanism that has an engaged section for engaging with the engaging section in order to transmit a driving force, wherein the transmission mechanism has a roller mechanism for guiding the engaging section and engaged section to disengage from each other.
    Type: Application
    Filed: May 22, 2015
    Publication date: July 6, 2017
    Applicant: Hitachi Koki Co., Ltd.
    Inventors: Shinichirou SATO, Yasuki OHMORI
  • Patent number: 8960516
    Abstract: A fastener driving tool is capable of not only linearly driving but also rotationally fastening a fastener into a workpiece P. The fastener driving tool includes a housing 2, a nose portion 40 formed with an injection passage 40a through which a fastener 41 is driven, a magazine 4 accommodating fasteners 41 and supplying a fastener 41 to the nose portion 40, a push lever 5 movable relative to the housing 2 upon depression against the workpiece P, combustion chamber frames 12, 22 movable in the housing 2 in accordance with the movement of the push lever 5, and first and second cylinders 7, 8 fixed to the housing 2. First and second pistons 71, 81 are movably disposed in the first and second cylinders 7,8, respectively, and a bit 9 extends from the first piston 71. A rod 14 formed with a rack 14A extends from the second piston 72. The rack 14A is engageable with a motion conversion mechanism 6 for converting a linear motion of the rod 14 into rotational motion of the bit 9.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: February 24, 2015
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yoshimitsu Iijima, Norikazu Baba, Yasuki Ohmori, Shouichi Hirai
  • Patent number: 8490516
    Abstract: A screw driving machine includes a bit that is movable to strike a screw against a workpiece and rotatable to rotate the screw to the workpiece, a combustion-type power mechanism including a spark plug that ignites combustible gas filled in a combustion chamber to apply striking force to cause the bit to strike the screw, a motor that generates a rotative force when supplied with electric force, and a power transmission mechanism that transmits the rotative force generated at the motor to the bit to cause the bit to rotate.
    Type: Grant
    Filed: September 3, 2010
    Date of Patent: July 23, 2013
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Norikazu Baba, Yasuki Ohmori, Shouichi Hirai
  • Publication number: 20120181319
    Abstract: A fastener driving tool is capable of not only linearly driving but also rotationally fastening a fastener into a workpiece P. The fastener driving tool includes a housing 2, a nose portion 40 formed with an injection passage 40a through which a fastener 41 is driven, a magazine 4 accommodating fasteners 41 and supplying a fastener 41 to the nose portion 40, a push lever 5 movable relative to the housing 2 upon depression against the workpiece P, combustion chamber frames 12, 22 movable in the housing 2 in accordance with the movement of the push lever 5, and first and second cylinders 7, 8 fixed to the housing 2. First and second pistons 71, 81 are movably disposed in the first and second cylinders 7,8, respectively, and a bit 9 extends from the first piston 71. A rod 14 formed with a rack 14A extends from the second piston 72. The rack 14A is engageable with a motion conversion mechanism 6 for converting a linear motion of the rod 14 into rotational motion of the bit 9.
    Type: Application
    Filed: September 15, 2010
    Publication date: July 19, 2012
    Applicant: Hitachi Koki Co., Ltd.
    Inventors: Yoshimitsu Iijima, Norikazu Baba, Yasuki Ohmori, Shouichi Hirai
  • Patent number: 8205777
    Abstract: A fuel gas has a gas including at least 40 weight % or more of 1-butene and propane, or at least 56 weight % or more of 1-butene and propylene. A combustion type power tool is driven by the fuel gas. A compressed gas container for a combustion type power tool has an inner side vessel filled with the fuel gas. When the fuel gas includes propane, 1-butene may be equal to or higher than 59 weight % and equal to or lower than 95 weight %. When the fuel gas includes propylene, the 1-butene may be equal to or higher than 70 weight % and equal to or lower than 96 weight %.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: June 26, 2012
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Tomomasa Nishikawa, Shinki Ohtsu, Yasuki Ohmori, Kunio Yamamoto
  • Patent number: 7918373
    Abstract: A combustion type power tool capable of avoiding wasteful injection of combustible gas from a gas canister even if an unintentional operation of the push lever takes place, and capable of avoiding wasteful electric power consumption even if a battery used as power supply remains set in the tool. While the tool is not being used, a stop unit is set at a stop position, preventing a gas canister from injecting gas, and while the tool is being used, the stop unit is set at a release position, allowing the gas canister to inject gas as a result of movement of a combustion chamber frame.
    Type: Grant
    Filed: March 8, 2007
    Date of Patent: April 5, 2011
    Assignee: Hitachi Koki Co., Ltd.
    Inventor: Yasuki Ohmori
  • Publication number: 20110073336
    Abstract: A screw driving machine includes a bit that is movable to strike a screw against a workpiece and rotatable to rotate the screw to the workpiece, a combustion-type power mechanism including a spark plug that ignites combustible gas filled in a combustion chamber to apply striking force to cause the bit to strike the screw, a motor that generates a rotative force when supplied with electric force, and a power transmission mechanism that transmits the rotative force generated at the motor to the bit to cause the bit to rotate.
    Type: Application
    Filed: September 3, 2010
    Publication date: March 31, 2011
    Applicant: Hitachi Koki Co., Ltd.
    Inventors: Norikazu Baba, Yasuki Ohmori, Shouichi Hirai
  • Patent number: 7815085
    Abstract: A combustion type driving tool including a combustion chamber frame which is provided in a housing, and can move in one direction and in the other direction thereby to define a combustion chamber when it has moved in the other direction, moving means which can select either of a manual operation valid state and a manual operation invalid state, and permits the combustion chamber frame to move in the other direction by manual operation, only in the manual operation valid state, and a link mechanism.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: October 19, 2010
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yasuo Sasaki, Yasuki Ohmori
  • Patent number: 7516876
    Abstract: A driving machine has a work contact portion with an end face to be contacted with a member to be fastened that is provided in a push lever, and a probe movably provided on the work contact portion, wherein the probe is energized in the driving direction by a spring to thereby project its leading end portion from the end face of the work contact portion. When the main body of the driving machine is pressed against a work, the probe is retreated from the driving passage of a fastening member when a tripper switch is operated.
    Type: Grant
    Filed: February 28, 2007
    Date of Patent: April 14, 2009
    Assignee: Hitachi Koki Co., Ltd.
    Inventor: Yasuki Ohmori
  • Publication number: 20090090760
    Abstract: A combustion type power tool capable of avoiding wasteful injection of combustible gas from a gas canister even if an unintentional operation of the push lever takes place, and capable of avoiding wasteful electric power consumption even if a battery used as power supply remains set in the tool. While the tool is not being used, a stop unit is set at a stop position, preventing a gas canister from injecting gas, and while the tool is being used, the stop unit is set at a release position, allowing the gas canister to inject gas as a result of movement of a combustion chamber frame.
    Type: Application
    Filed: March 8, 2007
    Publication date: April 9, 2009
    Inventor: Yasuki Ohmori
  • Publication number: 20090008423
    Abstract: A combustion type driving tool including a combustion chamber frame which is provided in a housing, and can move in one direction and in the other direction thereby to define a combustion chamber when it has moved in the other direction, moving means which can select either of a manual operation valid state and a manual operation invalid state, and permits the combustion chamber frame to move in the other direction by manual operation, only in the manual operation valid state, and a link mechanism.
    Type: Application
    Filed: January 17, 2008
    Publication date: January 8, 2009
    Inventors: Yasuo SASAKI, Yasuki Ohmori
  • Patent number: 7455121
    Abstract: A power tool includes an impact damping mechanism for damping an impact in a direction of rotation of a speed reduction mechanism portion 8.
    Type: Grant
    Filed: September 24, 2004
    Date of Patent: November 25, 2008
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Takuma Saito, Shinki Ohtsu, Yasuki Ohmori, Chikai Yoshimizu, Katsuhiro Oomori, Masanori Watanabe
  • Patent number: 7427007
    Abstract: A combustion-powered nail gun drives nails into a workpiece when both a head switch and a trigger switch are turned ON while a safety switch is turned ON. The nail driving operation cannot be performed if the safety switch is not ON even if both the head switch and the trigger switch are ON. The head switch is turned ON when a push lever is urged against the workpiece. Fuel/air mixture in a combustion chamber is ignited when the head switch and the trigger switch are turned ON irrespective of an order in which the head switch and the trigger switch are turned ON, whereby “successive-shot driving” can be performed in which the trigger switch is maintained in its ON position while successively driving a plurality of nails at different locations of the workpiece by repeatedly pushing and releasing the push lever toward and away from the workpiece.
    Type: Grant
    Filed: August 22, 2006
    Date of Patent: September 23, 2008
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yukihiro Shima, Yasuki Ohmori
  • Patent number: 7305940
    Abstract: In the combustion-type power tool, a first shelter wall and a second shelter wall are disposed to partially surround an area between an ignition plug and an ignition ground. Two gaps are provided between the first and second shelter walls. The first shelter wall extends radially outwardly from an outer peripheral surface of a motor boss, and also protrudes from an end face in an axial direction of a fan shaft. The first shelter wall has a lower end surface inclined such that an axial length between the end face and the lower end surface is gradually reduced toward radially outer end of the first shelter wall.
    Type: Grant
    Filed: February 17, 2006
    Date of Patent: December 11, 2007
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Tomomasa Nishikawa, Yasuki Ohmori, Shinki Ohtsu, Kunio Yamamoto, Yoshitaka Akiba, Haruhisa Fujisawa
  • Publication number: 20070215665
    Abstract: In the driving machine, a work contact portion 73 including an end face 74 to be contacted with a connecting metal member (a member to be fastened) K is provided in a push lever 10, a probe 78 is movably provided in the work contact portion 73, the probe 78 is energized in the driving direction by a spring (energizing means) 75 to thereby project its leading end portion 76 from the end face 74 of the work contact portion 73, and, in a state where the main body of the driving machine is pressed against a work (a member to be driven) W, by operating a trigger switch 6, the probe 78 is retreated from the driving passage of a nail (a fastening member) 41.
    Type: Application
    Filed: February 28, 2007
    Publication date: September 20, 2007
    Inventor: Yasuki Ohmori
  • Patent number: 7261071
    Abstract: A combustion-type power tool including a housing, a combustion chamber provided in the housing, an ignition plug exposed to the combustion chamber, a cleaning passage communicatable with the combustion chamber, and a shut-off unit provided in the cleaning passage.
    Type: Grant
    Filed: May 4, 2006
    Date of Patent: August 28, 2007
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Shinki Ohtsu, Yasuki Ohmori
  • Patent number: 7194988
    Abstract: A combustion-type power tool includes a cylinder and a combustion chamber disposed on top of the cylinder that accommodates a gaseous mixture of existing air in the combustion chamber and fuel injected therein. A spark plug generates a spark to combust the gaseous mixture in the combustion chamber. A trigger switch produces the spark in the spark plug when operated. A piston is movably supported in the cylinder and driven by combustion in the combustion chamber. A driving blade is integrally formed with the piston for driving a fastener. A push lever is provided at one end of the housing and coupled with the combustion chamber frame. A temperature sensor is provided, for example, on the combustion chamber frame to sense the temperature thereof. A stopper is operated to adjust the position of the push lever to be shifted from an initial position when the sensed temperature is higher than a critical value.
    Type: Grant
    Filed: November 16, 2005
    Date of Patent: March 27, 2007
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yasuki Ohmori, Shinki Ohtsu
  • Publication number: 20060283909
    Abstract: A combustion-powered nail gun drives nails into a workpiece when both a head switch and a trigger switch are turned ON while a safety switch is turned ON. The nail driving operation cannot be performed if the safety switch is not ON even if both the head switch and the trigger switch are ON. The head switch is turned ON when a push lever is urged against the workpiece. Fuel/air mixture in a combustion chamber is ignited when the head switch and the trigger switch are turned ON irrespective of an order in which the head switch and the trigger switch are turned ON, whereby “successive-shot driving” can be performed in which the trigger switch is maintained in its ON position while successively driving a plurality of nails at different locations of the workpiece by repeatedly pushing and releasing the push lever toward and away from the workpiece.
    Type: Application
    Filed: August 22, 2006
    Publication date: December 21, 2006
    Inventors: Yukihiro Shima, Yasuki Ohmori
  • Publication number: 20060225674
    Abstract: A combustion-type power tool including a housing, a combustion chamber provided in the housing, an ignition plug exposed to the combustion chamber, a cleaning passage communicatable with the combustion chamber, and a shut-off unit provided in the cleaning passage.
    Type: Application
    Filed: May 4, 2006
    Publication date: October 12, 2006
    Inventors: Shinki Ohtsu, Yasuki Ohmori