Patents by Inventor Mitsumasa Mizuno

Mitsumasa Mizuno 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: 20220143789
    Abstract: A torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a driving shaft side and a driven magnet member coupled to an output shaft side. One of the driving magnet member or the driven magnet member rotatably supports the other of the driving magnet member or the driven magnet member.
    Type: Application
    Filed: January 22, 2020
    Publication date: May 12, 2022
    Inventors: Takashi Kusagawa, Mitsumasa MIZUNO, Itaru MURUI
  • Publication number: 20220131434
    Abstract: An electric tool includes a motor. The motor includes a stator core and a rotor. The rotor rotates with respect to the stator core. The rotor includes: a rotor core having a circular cylindrical shape; a plurality of permanent magnets; and an output shaft. The output shaft is held inside the rotor core. The plurality of permanent magnets are arranged as spokes around a center of the rotor core.
    Type: Application
    Filed: November 21, 2019
    Publication date: April 28, 2022
    Inventors: Mitsumasa MIZUNO, Akito NAKAMURA, Koichiro ESAKA, Kenji OKADA
  • Publication number: 20220123610
    Abstract: An electric tool includes a motor. The motor includes a stator core and a rotor. The rotor has an output shaft and rotates with respect to the stator core. The stator core includes: an inner cylindrical portion having a circular cylindrical shape; and a plurality of teeth. Inside the inner cylindrical portion, the rotor is arranged. Each of the plurality of teeth includes a body portion and a tip piece. The body portion protrudes outward from the inner cylindrical portion along a radius of the inner cylindrical portion. The tip piece extends, from a tip part of the body portion, in a direction intersecting with a direction in which the body portion protrudes.
    Type: Application
    Filed: November 21, 2019
    Publication date: April 21, 2022
    Inventors: Koichiro ESAKA, Akito NAKAMURA, Kenji OKADA, Mitsumasa MIZUNO
  • Publication number: 20220111498
    Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.
    Type: Application
    Filed: December 20, 2021
    Publication date: April 14, 2022
    Inventors: Itaru MURUI, Hiroaki MURAKAMI, Mitsumasa MIZUNO, Akiko HONDA, Satoshi KAJIYAMA
  • Patent number: 11235445
    Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.
    Type: Grant
    Filed: November 30, 2017
    Date of Patent: February 1, 2022
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Itaru Murui, Hiroaki Murakami, Mitsumasa Mizuno, Akiko Honda, Satoshi Kajiyama
  • Publication number: 20210331305
    Abstract: An electric power tool includes: a motor; an output shaft; and a power transmission mechanism that transmits a rotational output of the motor to the output shaft. A motor control unit controls rotation of the motor in accordance with an on operation of the user operation switch performed by a user. A detector detects physical quantity data while the motor is being rotated. A status determination unit determines whether the electric power tool is in a deteriorated status, by using the physical quantity data. A notification interface communicates that the electric power tool is in a deteriorated status while the motor is not being rotated.
    Type: Application
    Filed: June 26, 2019
    Publication date: October 28, 2021
    Inventors: Itaru MURUI, Hiroaki MURAKAMI, Akiko HONDA, Masanori NAKAMOTO, Mitsumasa MIZUNO, Takashi KUSAGAWA, Masahiro SATO
  • Publication number: 20210323125
    Abstract: In an electric power tool, an acquisition unit acquires physical quantity data detected while a motor is being rotated. A storage unit stores the physical quantity data and time information related to time when the physical quantity data is acquired, mapping the physical quantity data and the time information to each other. A transmission unit transmits the physical quantity data and the time information to a server system. The server system includes: a server-side reception unit that receives the physical quantity data and the time information transmitted; and a status evaluation unit that evaluates a level of a status of the electric power tool by using the physical quantity data and the time information.
    Type: Application
    Filed: June 26, 2019
    Publication date: October 21, 2021
    Inventors: Itaru MURUI, Hiroaki MURAKAMI, Akiko HONDA, Masanori NAKAMOTO, Takashi KUSAGAWA, Masahiro SATO, Mitsumasa MIZUNO
  • Publication number: 20210229256
    Abstract: A torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of driving shaft driven into rotation by a motor and a driven magnet member coupled to a side of an output shaft on which a front-end tool is attachable. A clutch mechanism is provided between the motor and the torque transmission mechanism. A moment of inertia on the side of the driven magnet member is larger than a moment of inertia on the side of the driving magnet member.
    Type: Application
    Filed: March 20, 2019
    Publication date: July 29, 2021
    Inventors: Mitsumasa MIZUNO, Itaru MURUI, Atsushi NAKAMURA
  • Publication number: 20210086333
    Abstract: An impact rotary tool includes: a driver, a spindle, an anvil disposed in front of the spindle in a rotation axis direction, a main hammer applying a rotation force to the anvil, and a sub-hammer applying, to the main hammer having applied the rotation force to the anvil, a rotation force in the same direction.
    Type: Application
    Filed: March 20, 2019
    Publication date: March 25, 2021
    Inventors: Hiroaki MURAKAMI, Itaru MURUl, Akiko HONDA, Mitsumasa MIZUNO
  • Publication number: 20200280252
    Abstract: A torque transmission mechanism transmits a torque produced by a rotation of a driving shaft to an output shaft. A clutch mechanism is provided between a motor and the torque transmission mechanism. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to the driving shaft side and a driven magnet member coupled to the output shaft side. The driving magnet member and the driven magnet member are arranged such that magnetic surfaces on each of which S-pole magnets and N-pole magnets are alternately arranged face other. The clutch mechanism transmits the torque produced by the rotation of the driving shaft to the driving magnet member but does not transmit a torque the driving magnet member receives from the driven magnet member to the driving shaft.
    Type: Application
    Filed: June 15, 2018
    Publication date: September 3, 2020
    Inventors: Mitsumasa MIZUNO, Itaru MURUI, Satoshi KAJIYAMA, Hiroaki MURAKAMI, Akiko HONDA
  • Publication number: 20200180131
    Abstract: An electric power tool includes: a motor unit including a motor; a driving block for transmitting a rotational output of the motor to a front-end tool; and a rotation detector that detects an angle of rotation of the motor. The rotation detector includes a rotating body attached to a motor shaft and a position detector that outputs a rotational position signal corresponding to a rotational position of the rotating body. The rotating body includes an opening, and the motor shaft is press fitted and fixed to the opening of the rotating body.
    Type: Application
    Filed: March 14, 2018
    Publication date: June 11, 2020
    Inventors: Hiroaki MURAKAMI, Akiko HONDA, Mitsumasa MIZUNO
  • Publication number: 20200186008
    Abstract: A motor retainer is provided on an inner circumferential surface of a housing and retains an outer circumference of a motor unit. A rotation detector includes a rotating body attached to a motor shaft and a position detector that outputs a rotational position signal corresponding to a rotational position of the rotating body. A sensor substrate retainer is provided on the inner circumferential surface of the housing and retains the position detector at a position facing the rotating body.
    Type: Application
    Filed: March 14, 2018
    Publication date: June 11, 2020
    Inventors: Hiroaki MURAKAMI, Mitsumasa MIZUNO, Akiko HONDA
  • Publication number: 20200023500
    Abstract: An electric power tool includes: a driving shaft that is rotated by a motor; an output shaft on which a front-end tool is attachable; and a torque transmission mechanism that transmits a torque produced by the rotation of the driving shaft to the output shaft. The torque transmission mechanism includes a magnet coupling including a driving magnet member coupled to a side of the driving shaft and a driven magnet member coupled to a side of the output shaft, and the driving magnet member and the driven magnet member are provided such that respective magnetic surfaces face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces.
    Type: Application
    Filed: November 30, 2017
    Publication date: January 23, 2020
    Inventors: Itaru MURUI, Hiroaki MURAKAMI, Mitsumasa MIZUNO, Akiko HONDA, Satoshi KAJIYAMA
  • Patent number: 9701000
    Abstract: An impact rotation tool including a drive source, an impact force generation unit that generates an impact force for converting power from the drive source to pulsed torque, a shaft that transmits the pulsed torque to a bit used to perform a tightening task, a torque measurement unit that measures torque applied to the shaft as measured torque, a rotation angle measurement unit that measures a rotation angle of the shaft, a tightening torque calculation unit that calculates an angular acceleration from the rotation angle to calculate a tightening torque based on the angular acceleration and the measured torque, and a controller that controls the drive source based on the tightening torque.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: July 11, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Fumiaki Sekino, Kenichirou Inagaki, Toshiharu Ohashi, Tadashi Arimura, Ryuji Otani, Mitsumasa Mizuno
  • Publication number: 20160325414
    Abstract: An impact rotation tool includes an impact force generator that changes power of a drive source into pulsed torque to generate impact force. An output shaft transmits the pulsed torque to a bit based on the impact force. A torque measurement unit measures a shaft torque applied to the output shaft. An angular acceleration measurement unit measures angular acceleration of the output shaft. A moment of inertia calculator calculates moment of inertia of the bit coupled to the output shaft when rotated by the output shaft based on the shaft torque and the angular acceleration. A torque calculator calculates tightening torque based on the angular acceleration, the shaft torque, and the moment of inertia. A controller controls the drive source based on the tightening torque.
    Type: Application
    Filed: December 10, 2014
    Publication date: November 10, 2016
    Inventors: Mitsumasa MIZUNO, Fumiaki SEKINO, Ryuji OTANI
  • Patent number: 9427852
    Abstract: A rotary impact tool comprises: a motor that is a rotation driving source; an impact generation device for generating a pulse impact by rotation of the motor and applying a rotational torque to an output shaft by the impact; a torque sensor for measuring the torque applied to the output shaft; and a control means for halting the motor when the torque measured by the torque sensor has reached a target torque having been set. The control means is configured to change an increased torque value for one impact according to the target torque having been set.
    Type: Grant
    Filed: August 8, 2011
    Date of Patent: August 30, 2016
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Mitsumasa Mizuno, Toshiharu Ohashi
  • Patent number: 9089956
    Abstract: An impact power tool includes an impact mechanism for applying a striking impact to an output shaft by using an output power of a motor. A strike detection unit detects the striking impact applied by the impact mechanism to obtain a striking timing and a striking speed detection unit calculates a striking speed from the striking timing obtained by the strike detection unit and a rotation angle of the motor obtained by a rotation angle detection unit. A control unit counts the number of striking impact detected by the strike detection unit and stops the motor if the number of striking impact reaches a predetermined strike number. The control unit is designed to correct the predetermined strike number when the striking speed obtained in the striking speed detection unit is equal to or lower than a specified striking speed.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: July 28, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Tadashi Arimura, Mitsumasa Mizuno, Toshiharu Ohashi, Masaaki Sakaue
  • Publication number: 20150021062
    Abstract: An impact rotation tool including a drive source, an impact force generation unit that generates an impact force for converting power from the drive source to pulsed torque, a shaft that transmits the pulsed torque to a bit used to perform a tightening task, a torque measurement unit that measures torque applied to the shaft as measured torque, a rotation angle measurement unit that measures a rotation angle of the shaft, a tightening torque calculation unit that calculates an angular acceleration from the rotation angle to calculate a tightening torque based on the angular acceleration and the measured torque, and a controller that controls the drive source based on the tightening torque.
    Type: Application
    Filed: July 16, 2014
    Publication date: January 22, 2015
    Inventors: Fumiaki SEKINO, Kenichirou INAGAKI, Toshiharu OHASHI, Tadashi ARIMURA, Ryuji OTANI, Mitsumasa MIZUNO
  • Publication number: 20130133912
    Abstract: A rotary impact tool comprises: a motor that is a rotation driving source; an impact generation device for generating a pulse impact by rotation of the motor and applying a rotational torque to an output shaft by the impact; a torque sensor for measuring the torque applied to the output shaft; and a control means for halting the motor when the torque measured by the torque sensor has reached a target torque having been set. The control means is configured to change an increased torque value for one impact according to the target torque having been set.
    Type: Application
    Filed: August 8, 2011
    Publication date: May 30, 2013
    Applicant: PANASONIC CORPORATION
    Inventors: Mitsumasa Mizuno, Toshiharu Ohashi
  • Publication number: 20090084568
    Abstract: An impact power tool includes an impact mechanism for applying a striking impact to an output shaft by using an output power of a motor. A strike detection unit detects the striking impact applied by the impact mechanism to obtain a striking timing and a striking speed detection unit calculates a striking speed from the striking timing obtained by the strike detection unit and a rotation angle of the motor obtained by a rotation angle detection unit. A control unit counts the number of striking impact detected by the strike detection unit and stops the motor if the number of striking impact reaches a predetermined strike number. The control unit is designed to correct the predetermined strike number when the striking speed obtained in the striking speed detection unit is equal to or lower than a specified striking speed.
    Type: Application
    Filed: September 12, 2008
    Publication date: April 2, 2009
    Applicant: Matsushita Electric Works, Ltd.
    Inventors: Tadashi Arimura, Mitsumasa Mizuno, Toshiharu Ohashi, Masaaki Sakaue