Patents Assigned to Hitachi Koki Co., LTD
  • Patent number: 9769990
    Abstract: A power tool includes: a power source (7); a tip tool (2); two switches (SW1,SW2); and a control unit (6e). The tip tool (2) is configured to be driven by the power source (7). The two switches (SW1,SW2) are configured to be turned on for activating the power source (7). The control unit (6e) is configured to control the power source (7) in accordance with on/off of the two switches (SW1,SW2), and operate if at least one of the two switches (SW1,SW2) is turned on.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: September 26, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Toshiaki Koizumi, Kazutaka Iwata, Yasutaka Shimizu
  • Patent number: 9774017
    Abstract: An electric device body in which a battery pack including a plurality of battery cells and a plurality of first terminals is detachably mounted includes: a housing; a guide mechanism; and a plurality of second terminals; and a pressed portion. The battery pack is configured to be attached to and detached from the housing along a first direction. The guide mechanism is provided at the housing and configured to define the first direction. The plurality of second terminals is configured to be connected to the plurality of first terminals upon attachment of the battery pack to the housing. The pressed portion is configured to be pressed against the battery pack in a second direction intersecting the first direction when the battery pack has been attached to the housing.
    Type: Grant
    Filed: January 14, 2014
    Date of Patent: September 26, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Hiroki Uchida, Yoshihiro Nakano, Yoshihiro Komuro, Tetsuhiro Harada, Hideyuki Tanimoto
  • Patent number: 9768713
    Abstract: An electric tool includes a brushless motor and an output part, which is driven by the brushless motor and to which a tip tool is mounted, and a tumbler switch. The tumbler switch applies, to the control unit, a stop signal for stopping the brushless motor at a neutral position, a forward rotation signal for forward rotating the brushless motor by an operation in a first direction, and a reverse rotation signal for reversely rotating the brushless motor by an operation in a second direction.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: September 19, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Toshiaki Koizumi, Naoki Tadokoro, Kazutaka Iwata, Eiji Nakayama
  • Publication number: 20170264219
    Abstract: Provided is an easy-to-use electric tool with which braking force can be changed according to work conditions. When an operation switch 5 is turned off, a control unit 50 detects a rotation rate R1 of an electric motor 6. The control unit 50 stands by for a prescribed period, detects a rotation rate R2 of the electric motor 6, and calculates the difference between the rotation rates R1, R2 (R=R1?R2). Since the rotation rate difference R corresponds to the rate of change in rotation rate with time during deceleration of the electric motor 6 and is smaller the larger the moment of inertia of the attached rotary tool, the control unit 50 can determine the moment of inertia of the rotary tool on the basis of the rotation rate difference R. The control unit 50 sets the braking force according to the moment of inertia and performs braking.
    Type: Application
    Filed: October 30, 2015
    Publication date: September 14, 2017
    Applicant: HITACHI KOKI CO., LTD.
    Inventor: Yuuki TAKEDA
  • Patent number: 9757739
    Abstract: A centrifuge and a rotor thereof are provided. The centrifuge performs centrifugation in a state where the sample container is swung by rotation and seated in a cutout part of a rotor body. The sample container includes a bucket accommodating a container filled with a sample, and a lid for sealing the bucket and having a rotation shaft. Grooves extending in the longitudinal direction are formed on the outer peripheral surface of the bucket on the bottom side with respect to a seating surface of the bucket. The grooves are arranged at equal intervals in the circumferential direction. Formation of the grooves can prevent increasing the weight of the bucket and realize a highly rigid sample container that can withstand deformation.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: September 12, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Jun Sato, Kenichi Nemoto
  • Patent number: 9759176
    Abstract: An engine is configured such that, during the starting of the engine, when it is being detected that throttle opening has been set at a starting position, if it is detected that the engine speed has exceeded a predetermined speed slightly lower than a speed when a centrifugal clutch becomes an engaged state, a control unit retards the ignition timing from a general angle to a first angle BTDC, and then advances the ignition timing to a second angle at predetermined intervals, and holds the ignition timing at the second angle for a predetermined time period, thereby preventing the engine from stopping due to fouling on the spark plug while suppressing the engine speed at the speed when the centrifugal clutch becomes the engaged state, or less.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: September 12, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Akira Mezaki, Shigetoshi Ishida
  • Publication number: 20170254293
    Abstract: The disclosure provides a two-cycle engine and an engine work machine. When a piston is located on the side of a bottom dead center, at a part corresponding to a notch part in the piston, an inner surface of the crank case protrudes toward an interior side to form a crank case first protruding part penetrating through the notch part toward the interior side. Meanwhile, the crank case at a part corresponding to a part without the notch part in the piston is not in a shape protruding toward the interior side. By assembling the piston and the crank case in such shapes, the piston is able to reciprocally move up and down without interfering with the crank case. In this case, by disposing the crank case first protruding part, the volume in the crank case is able to be reduced.
    Type: Application
    Filed: August 21, 2015
    Publication date: September 7, 2017
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Yosuke YOSHIZAKI, Naoto ICHIHASHI
  • Publication number: 20170246736
    Abstract: Provided is an impact tool which can perform control in accordance with working situations. The impact tool converts a torque of a brushless motor into a striking force and applies it to a tip tool. The impact tool includes: a motor control unit which makes detection about whether the tip tool is pressed against an object during the rotation of the brushless motor; and a motor control unit which performs speed increase control for increasing the rotational speed of the brushless motor when a state of pressing the tip tool against the object has been detected continuously for a predetermined time.
    Type: Application
    Filed: September 29, 2015
    Publication date: August 31, 2017
    Applicant: HITACHI KOKI CO., LTD.
    Inventor: Atsuyuki KIKUCHI
  • Patent number: 9748534
    Abstract: When a battery pack is mounted to a battery attachment part, the battery pack is slid in a horizontal direction (a direction substantially perpendicular to an upper-lower direction) with respect to the housing, e.g., along a long longitudinal direction of a battery-side rail part, such that tool-side rail parts of the battery attachment part are introduced into engaging recess portions of the battery pack. Thereby, the elastic members are fitted and compressed in the battery-side rail parts and the tool-side rail parts, so that the elastic members press upwards the battery-side rail part (e.g., the battery pack) and press downwards the tool-side rail parts (e.g., the housing). That is, the elastic members press the battery pack and the housing such that they come close to each other.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: August 29, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Hiroyuki Hanawa, Shota Takeuchi, Yoshihiro Nakano, Itsushi Ogawa, Kousei Yokoyama
  • Patent number: 9731301
    Abstract: Provided is a swing rotor for a centrifuge. The centrifuge includes a swing type rotor body having a plurality of holding pins and a plurality of buckets held by the holding pins in a swingable manner. On the rotor body, a connection part is formed to connect two branch arms that diverge from an arm part on an outer peripheral side. A thickness-reduced part penetrating in the same direction as a driving shaft is formed in a region surrounded by the two branch arms on an inner peripheral side of the connection part. Since the branch arms deform accordingly to a certain extent, partial concentration of the stress applied on the holding pins due to a centrifugal load can be alleviated. Thus, the lifespan of the centrifuge can be improved and the centrifugal separation operation can be stabilized.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: August 15, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Jun Sato, Kenichi Nemoto
  • Publication number: 20170209995
    Abstract: The disclosure discloses a driving machine includes a trigger, a first switch turned on or off by an operation of the trigger, a push lever that moves in response to an operation of pressing an ejection port of a fastener against a driven material, and a second switch turned on or off by movement of the push lever. The driving machine drives the fastener when the first switch and the second switch are both in the ON state. The trigger includes a switching mechanism to switch between a single-shot driving mode and a continuous-shot driving mode.
    Type: Application
    Filed: January 24, 2017
    Publication date: July 27, 2017
    Applicant: HITACHI KOKI CO., LTD.
    Inventors: Yoshimitsu IIJIMA, Hiroki KITAGAWA
  • Publication number: 20170190027
    Abstract: In order to provide an electric tool such that the capacitances of noise-suppressing film capacitors can be increased without increasing the diameter of a handle section, the housing of the electric tool comprises: a body section that stores a brushless motor, a striking mechanism part, and a portion of an output part; a handle section, whose one end is connected to the body section; and a storage section that is formed on the other end of the handle section. A pair of film capacitors for removing noise generated from an inverter circuit are mounted on a capacitor substrate and stored side by side inside the handle section. The film capacitors are connected in parallel with each other, thereby providing a capacitor having a larger total capacitance than before.
    Type: Application
    Filed: May 22, 2015
    Publication date: July 6, 2017
    Applicant: Hitachi Koki Co., Ltd.
    Inventors: Toshiaki KOIZUMI, Takuya YOSHINARI
  • Publication number: 20170194846
    Abstract: An electric tool is provided with a rotary striking mechanism unit converting the rotational force of a brushless motor to a striking force and applying the striking force to a tip tool. The required rated input of the motor is 1000-1300 W, the motor speed under fixed speed control is 16800±10% (min?1), and the variable Ku, which relates to the motor, is defined by the following expression Ku={(stator core outer diameter)2×(stator core lamination thickness)×(total tooth width)×(rotor outer diameter)}÷{(rated input)×(motor speed under fixed speed control)}, wherein the stator core outer diameter, the stator core lamination thickness, the total tooth width and the rotor outer diameter are shown in mm, the rated input is shown in W, the motor speed is shown in min?1, and the Ku value of the motor is set to 14.6?Ku?21.8.
    Type: Application
    Filed: May 22, 2015
    Publication date: July 6, 2017
    Applicant: Hitachi Koki Co., Ltd.
    Inventor: Hideyuki TANIMOTO
  • 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: 9693470
    Abstract: An electric device includes: a device body; and a frame guard. The device body has a plurality of surfaces for defining a three-dimensional configuration. The frame guard is configured to guard the device body. The frame guard is connected to the device body and disposed outside the device body. The plurality of surfaces is all disposed inside the frame guard.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: June 27, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Takafumi Itoh, Masanori Okada, Rui Akiba, Masato Sakai
  • Publication number: 20170165824
    Abstract: An electric tool is provided. This electric tool includes a controller which controls power supply to the motor in response to operation of a switch lever which turns rotation of the motor ON and OFF. The electric tool includes a magnetic body provided on a movable arm which is moved by means of a switch lever, and a first and second magnetic detection units (Hall ICs) provided adjacent to the range of motion of the magnetic body. The first magnetic detection unit detects the approach of the magnetic body when the switch lever is in the motor OFF position, and the second magnetic detection unit detects approaching of the magnetic body when the switch lever is in the ON position. The controller uses the two detection results to determine the switch lever position. The magnetic detection units are accommodated in a casing which is isolated from a cooling wind path.
    Type: Application
    Filed: June 19, 2015
    Publication date: June 15, 2017
    Applicant: HITACHI KOKI CO., LTD.
    Inventor: Yuuki TAKEDA
  • Patent number: 9680349
    Abstract: An electric power tool including: a housing; a brushless motor accommodated in the housing; a fan attached to a rotation shaft of the brushless motor; a switching element configured to control the brushless motor; and a substrate on which the switching element is mounted, wherein a first through-hole is provided to a switching element arranged portion of the substrate.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: June 13, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Junichi Tokairin, Naoki Sato, Itsushi Ogawa
  • Patent number: 9669536
    Abstract: A powered working machine facilitating work of fixing a tip tool to a tool supporting member is provided. A powered working machine in which a tip tool is driven by power of an electric-powered motor includes: an output shaft to which the tip tool is attached; a tool fixing member which fixes the tip tool to the output shaft; a second shaft to/from which the tool fixing member is attached/detached; a clamp having a locked state in which a state of attachment of the tool fixing member to the second shaft is maintained and an unlocked state in which the tool fixing member can be detached from the second shaft; and a guide member having a first rotation position at which the clamp is in the locked state and a second rotation position at which the clamp is in the unlocked state.
    Type: Grant
    Filed: December 24, 2014
    Date of Patent: June 6, 2017
    Assignee: HITACHI KOKI CO., LTD.
    Inventors: Yutaka Ito, Itsushi Ogawa, Junichi Toukairin, Jyun Enta
  • Patent number: D792182
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: July 18, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Megumi Ishikawa, Tomoyuki Kawahara, Satoshi Iwata
  • Patent number: D792708
    Type: Grant
    Filed: July 30, 2015
    Date of Patent: July 25, 2017
    Assignee: Hitachi Koki Co., Ltd.
    Inventors: Yuko Tazawa, Masato Sakai, Kenichi Yamada, Shuji Takeda