Patents Assigned to Hitachi Koki Co., LTD
  • Patent number: 9669529
    Abstract: In a driving tool, a push lever plunger is moved upward by a push lever unit when the push lever unit is disposed at an uppermost position. The push lever unit includes a first protruding part and a second protruding part. The first protruding part is configured to contact a first contact part of a housing when the push lever unit is disposed at the uppermost position. The second protruding part is configured to contact a second contact part of the housing when the push lever unit is disposed at the uppermost position. A compressed air control unit, the second protruding part, and an ejection channel are disposed within an imaginary plane extending in an approximate vertical direction. The compressed air control unit is disposed on a side opposite to the second protruding part with respect to the ejection channel in a horizontal direction.
    Type: Grant
    Filed: August 13, 2014
    Date of Patent: June 6, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yoshinori Ishizawa, Haruhiko Oouchi
  • Patent number: 9670837
    Abstract: An engine-powered work tool includes an engine having a crank shaft, an ignition system, an output controller having a throttle valve shaft for controlling output of the engine, a wind governor connected to the throttle valve shaft, a rotation speed detector and an ignition control unit. The wind governor includes a governor plate movable upon receipt of cooling air generated by a cooling fan to control an angular rotation of the throttle valve shaft. The rotation speed detector detects a rotation speed of the crank shaft. The ignition control unit controls the ignition system based on the rotation speed of the crank shaft detected by the rotation speed detector to reduce the output of the engine when the rotation speed detector determines that the governor plate exceeds a predetermined position.
    Type: Grant
    Filed: December 22, 2014
    Date of Patent: June 6, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Hiroshi Honzawa, Shigetoshi Ishida
  • Patent number: 9670998
    Abstract: An oscillation tool includes a grip-portion housing and a front-side housing which are fitted to each other so as to freely slide on each other. In the case that a driving unit and an oscillating unit are distanced from each other, the oscillating shaft is oscillated at a narrow amplitude. On the other hand, in a case that the driving unit and the oscillating unit are approached by each other, the oscillating shaft is oscillated at a wide amplitude.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: June 6, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Atsushi Sumi, Shota Takeuchi
  • Publication number: 20170144278
    Abstract: In order to increase the screw tightening speed and improve the work efficiency, three first pawls 30e of a hammer 30 and three second pawls 18d of an anvil 18 are provided, so that a striking interval can be set to “interval of 120 degrees”, which is shorter than that of the related art. By setting total inertia obtained by sum of inertia of a rotor 12b and inertia of a spindle 26 to a low value which is “300 kg·mm2” or less when converted in terms of a rotation axis of the spindle 26, the rotor 12b and the spindle 26 can be sufficiently accelerated and the work efficiency can be improved.
    Type: Application
    Filed: June 19, 2015
    Publication date: May 25, 2017
    Applicants: HITACHI KOKI CO., LTD., HITACHI KOKI CO., LTD.
    Inventors: Tomomasa NISHIKAWA, Tetsuhiro HARADA, Nobuhiro TAKANO, Satoru MATSUNO
  • Patent number: 9656275
    Abstract: A centrifuge including a rotor, a rotor chamber accommodating therein the rotor and having an opening, a motor configured to rotate the rotor, a door configured to close the opening of the rotor chamber, an input unit configured to receive an input of an operation condition, a display unit configured to display an operating status, and a control unit configured to control rotation of the motor, wherein the control unit is configured to perform a program operation under an operation condition including a plurality of steps, and wherein the control unit is configured so that a specific step of stopping the rotation of the rotor and permitting the door to be opened or closed can be set as at least one of the plurality of steps.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: May 23, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Hisanobu Ooyama, Kahoru Takahashi
  • Publication number: 20170136614
    Abstract: An electric tool is provided. The electric tool prevents anomalies in motor rotation due to dust and moisture sucked in together with a cooling wind, and is configured such that rotational position detection operations and switch operations are not affected. In the electric tool which drives a brushless DC motor using a controller, a magnetic body for rotational position detection is provided on a rotation shaft which can rotate integrally with a rotor, Hall ICs are provided to detect the rotational position of the magnetic body and output a position signal to the controller, and the magnetic body and the Hall ICs mounted on a substrate are arranged in a region isolated from the wind path of the cooling wind generated by rotation of a cooling fan. The Hall ICs are accommodated in a housing filled with resin.
    Type: Application
    Filed: June 19, 2015
    Publication date: May 18, 2017
    Applicant: HITACHI KOKI CO., LTD.
    Inventor: Yuuki TAKEDA
  • Patent number: 9644618
    Abstract: A working machine has an oil groove communicating a pump chamber with a gear chamber, and a small amount of oil is delivered to the gear chamber when oil is discharged from the pump chamber. Thus, the oil adheres to the outer peripheral surface of a rotating pump shaft and is kept remaining between a pump case and the pump shaft. Therefore, the viscosity is increased and a pressure loss between the pump chamber and the gear chamber is increased. Accordingly, the airtightness can be maintained, and the stable and inexpensive oil pump mechanism requiring less man-hour can be realized without depending on the accuracy of a gap between the pump case and the pump shaft. Since oil is kept remaining on the outer peripheral surface of the pump shaft, it is possible to prevent the pump case from being worn out and to improve the durability of components.
    Type: Grant
    Filed: July 24, 2013
    Date of Patent: May 9, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventor: Takahiro Hirai
  • Patent number: 9636762
    Abstract: A desk-top cutting machine including: a base configured to support a workpiece; a cutting part including, a motor configured to rotary drive a cutting tool, a main cover covering an upper portion of the cutting tool, and a protective cover covering a portion of the cutting tool that is not covered by the main cover, the protective cover configured to move in a direction of exposing the cutting tool when the cutting part swings toward a bottom dead point from a top dead point; and a cutting part support mechanism configured to swingably support the cutting part, characterized in that: the motor is configured to be rotated at a first rotational speed slower than a maximum rotational speed thereof when the cutting part is positioned at the top dead point.
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: May 2, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Hideaki Terashima, Takuya Konnai
  • Patent number: 9636840
    Abstract: A chain saw is provided with an adjustment mechanism that adjusts the tension of a saw chain 4 attached along a guide bar 3 projecting from a main body 2. The adjustment mechanism has a rotation shaft 55 that is provided with a feed screw, a moving element 70 that is moved on the rotation shaft 55 in an axial direction along with rotation of the rotation shaft 55 and moves the guide bar 3 forward/backward with respect to the main body 2, and a transmission mechanism including an internal gear 51 provided on an inner peripheral surface of an adjustment dial 50 rotatably provided on the main body 2 and an external gear 52 disposed on an inner side of the adjustment dial 50 and engaged with the internal gear 51. When the internal gear 51 is rotated along with rotation of the adjustment dial 50, the rotation shaft 55 is rotated via the external gear 52.
    Type: Grant
    Filed: March 6, 2013
    Date of Patent: May 2, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventor: Hiroyuki Saitoh
  • Patent number: 9616558
    Abstract: According to an aspect of the present invention, there is provided an impact tool including: a motor; a hammer connected to an output portion of the motor; and an anvil to be struck by the hammer in a rotation direction and having a rotary shaft, the hammer striking the anvil in the rotation direction by driving the motor in pulses, wherein the anvil is provided in front of the hammer, wherein the hammer is driven in pulses by the motor, and wherein a rotation angle of the hammer is substantially proportional to a rotation angle of the motor.
    Type: Grant
    Filed: July 29, 2010
    Date of Patent: April 11, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Tomomasa Nishikawa, Nobuhiro Takano, Hideyuki Tanimoto, Kazutaka Iwata, Hironori Mashiko, Hayato Yamaguchi, Atsushi Nakagawa, Katsuhiro Oomori, Mizuho Nakamura, Hiroki Uchida, Saroma Nakano, Chikai Yoshimizu
  • Patent number: 9596776
    Abstract: In order to provide the electrical apparatus capable of improving the handleability, the electrical apparatus of the present invention includes the fan main body portion converting electrical power into wind to output the converted wind from a front face side to an outside of the fan main body portion, the pair of side frames supporting the fan main body portion, the pair of bottom frames extending from lower ends of the side frames to a rear side, the connecting frame connecting the pair of bottom frames, and the battery retaining portion having a rechargeable battery for supplying electrical power to the fan main body portion detachably attached thereto, where the battery retaining portion is provided in the connecting frame and disposed with a space from an air inlet port at a rear face of the tan main body portion.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: March 14, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Shigeru Takahashi, Masanori Watanabe, Takafumi Itoh, Jyunichi Suzuki
  • Patent number: 9590475
    Abstract: According to an aspect of the invention, an electric power tool which includes a brushless direct-current motor and a drive circuit that supplies drive power to the motor, and which rotates or drives a tool, characterized in that the drive circuit includes plural switching elements, and is arranged on a board provided in a grip portion of a housing or below the grip portion; and an electric fan is provided in the vicinity of the switching element for cooling the switching element.
    Type: Grant
    Filed: December 13, 2013
    Date of Patent: March 7, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Katsuhiro Oomori, Junichi Tokairin, Hiroki Uchida
  • Publication number: 20170050196
    Abstract: The present invention provides a centrifuge comprising a lid section of a sample container, the lid section having a rotating shaft for swinging, and a swing-type rotor, and the centrifuge conducts centrifugation operation in a state where the sample container is seated in a bucket housing section by making the sample container in which the rotating shaft is mounted to a rotating shaft engagement groove of the rotor swing due to the rotation of the rotor. The rotating shaft comprises a plurality of members connected by a connection section and is configured so as to be bendable at the connection section by a centrifugal load accompanying the rotation of the rotor.
    Type: Application
    Filed: April 27, 2015
    Publication date: February 23, 2017
    Applicant: Hitachi Koki Co., Ltd.
    Inventors: JUN SATO, KENICHI NEMOTO
  • Publication number: 20170043466
    Abstract: The disclosure provides a work tool having an electric motor, a power transmission means that receives motive power from the electric motor and transmits the motive power to a tip tool, a gear housing for accommodating at least a portion of the power transmission means, weights swingably supported on the gear housing, and coil springs that function as an urging means for urging the weights such that the weights are located at an initial neutral position, wherein the weights and the coil springs are provided respectively on the two sides of the gear housing so as to put the power transmission means therebetween, and a rotational support axle is provided that functions as a connecting means for connecting the weights provided on both sides of the gear housing so as to connect the weights such that the weights swing integrally.
    Type: Application
    Filed: April 30, 2015
    Publication date: February 16, 2017
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Daijiro TANABE, Goya FUJIMOTO, Ryusuke KOBAYASHI, Kuniaki KANBE, Shinichirou SATOU
  • Publication number: 20170047618
    Abstract: The present invention provides a charging device, an electric tool and a cell pack which is provided with an IC tag to make it possible to identify the type of cell group. A cell pack includes: a cell group, having one or more secondary cells; a case for accommodating the cell group and provided with a connection part that can be connected to a charging device for charging the cell group and can be connected to an electric tool driven by discharging of the cell group; and an IC tag for storing cell information pertaining to the cell group.
    Type: Application
    Filed: April 27, 2015
    Publication date: February 16, 2017
    Applicant: Hitachi Koki Co., Ltd.
    Inventor: Toshiyuki SUZUKI
  • Patent number: 9570952
    Abstract: A disk motor including: a rotor; a stator; an output shaft concentrically fixed to the rotor; at least one coil disk which is provided to one of the rotor or the stator, a coil pattern which includes a plurality of radial patterns or radial pattern groups extending outwards in a radial direction from a center part of the coil disk being formed on at least one surface of the coil disk; an electric current supply portion which supplies electric current to the coil pattern; a magnetic flux generating portion which is provided to another of the rotor or the stator and faces the coil pattern; and an intermediate pattern which is formed between adjacent radial patterns or adjacent radial pattern groups on the coil disk.
    Type: Grant
    Filed: January 31, 2012
    Date of Patent: February 14, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Kenichirou Yoshida, Hideyuki Tanimoto
  • Publication number: 20170036327
    Abstract: Provided is an impact type electric tool. A striking mechanism is used, which uses a hammer having striking claws that are equally arranged in the rotational direction and an anvil having struck claws. A relationship between a striking energy E, which the hammer has right before striking the anvil, and a disengaging torque TB, which is applied between the hammer and the anvil right before the hammer is disengaged from the anvil, is set as 5.3×TB<E<9.3×TB in the case of three claws and set as 9.3×TB<E<15.0×TB in the case of two claws, so as to perform striking by skipping one of the claws of the hammer and the anvil when a high torque is required. Accordingly, the electric tool achieves output of a high torque while maintaining a favorable operational feeling during striking.
    Type: Application
    Filed: August 1, 2016
    Publication date: February 9, 2017
    Applicant: Hitachi Koki Co., Ltd.
    Inventors: Takuhiro Murakami, Junichi Tokairin, Shota Takeuchi, Hironori Mashiko, Yuta Noguchi, Akira Matsushita
  • Patent number: 9561548
    Abstract: An electric tool including: a motor; a housing including, a motor housing accommodating the motor, and a handle housing having one end connected to the motor housing and another other end configured to be provided with a detachable battery pack; an output part partially accommodated in the motor housing and configured to be driven by the motor; and a control board accommodated in the motor housing and configured to control the motor.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: February 7, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Yuji Kishima, Takeshi Takeda
  • Patent number: D780687
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: March 7, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Takeshi Taniguchi, Rui Akiba, Toshiyuki Suzuki, Shota Kanno
  • Patent number: D785427
    Type: Grant
    Filed: February 19, 2016
    Date of Patent: May 2, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Shingo Kosugi, Masanori Okada, Keita Saitou