Patents by Inventor Chikai Yoshimizu
Chikai Yoshimizu 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).
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Patent number: 10547182Abstract: When a main switch (12) is turned ON, an electric operating machine (1) is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.Type: GrantFiled: February 10, 2017Date of Patent: January 28, 2020Assignee: KOKI HOLDINGS CO., LTD.Inventors: Nobuhiro Takano, Kazuhiko Funabashi, Hideyuki Tanimoto, Chikai Yoshimizu, Hiromi Ozawa, Yoshihiro Hoshi
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Patent number: 10263228Abstract: The sealing property obtained when a battery pack is attached to an electric power tool is improved. An electric power tool to/from which a battery pack retaining a battery cell is attachable/detachable has: a tool main body being provided with an attachment part to/from which the battery pack is attached/detached; a guide groove which is provided in the attachment part and which determines a direction of the attachment/detachment of the battery pack; a device-side terminal which is provided in the attachment part and which is connected to a battery-side terminal provided in the battery pack; and a seal member which is provided in the attachment part and which seals a connecting part between the battery-side terminal and the device-side terminal.Type: GrantFiled: July 16, 2013Date of Patent: April 16, 2019Assignee: Koki Holdings Co., Ltd.Inventors: Tomomasa Nishikawa, Tetsuhiro Harada, Chikai Yoshimizu, Hiroyuki Hanawa
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Publication number: 20170155258Abstract: When a main switch (12) is turned ON, an electric operating machine (1)is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.Type: ApplicationFiled: February 10, 2017Publication date: June 1, 2017Inventors: Nobuhiro TAKANO, Kazuhiko FUNABASHI, Hideyuki TANIMOTO, Chikai YOSHIMIZU, Hiromi OZAWA, Yoshihiro HOSHI
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Patent number: 9616558Abstract: 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: GrantFiled: July 29, 2010Date of Patent: April 11, 2017Assignee: 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
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Publication number: 20160207187Abstract: A drilling device capable of easily pulling an end bit out of a workpiece is provided. The drilling device is provided with a housing, a brushless motor, a motion translating mechanism, and an output portion. The motion translating mechanism includes a rotation transmitting portion. The rotation transmitting portion includes a bevel gear and clutch. The bevel gear has an abutment portion. The clutches has an abutted portion. Rotational play is formed between the abutment portion and the abutted portion.Type: ApplicationFiled: July 25, 2014Publication date: July 21, 2016Inventors: Tomomasa Nishikawa, Chikai Yoshimizu, Nobuhiro Takano
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Patent number: 9160211Abstract: An electric grasscutter includes a motor (50) which drives a rotary blade (42). The motor (50) is a brushless motor accommodated in a motor housing (51) and including a rotor (53) provided integrally with an output shaft (52), and a stator (54) fixed to the motor housing (51). A motor control circuit which drives the motor (50) is accommodated in the motor housing (51). The motor control circuit includes an inverter having FETs (81-86) as switching elements, and a control section to control the FETs (81-86). The FETs (81-86) are fixed in contact with the motor housing (51).Type: GrantFiled: September 22, 2010Date of Patent: October 13, 2015Assignee: HITACHI KOKI CO., LTD.Inventors: Hideyuki Tanimoto, Chikai Yoshimizu, Nobuhiro Takano, Hiromi Ozawa, Kazuhiko Funabashi
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Publication number: 20150214520Abstract: The sealing property obtained when a battery pack is attached to an electric power tool is improved. An electric power tool to/from which a battery pack retaining a battery cell is attachable/detachable has: a tool main body being provided with an attachment part to/from which the battery pack is attached/detached; a guide groove which is provided in the attachment part and which determines a direction of the attachment/detachment of the battery pack; a device-side terminal which is provided in the attachment part and which is connected to a battery-side terminal provided in the battery pack; and a seal member which is provided in the attachment part and which seals a connecting part between the battery-side terminal and the device-side terminal.Type: ApplicationFiled: July 16, 2013Publication date: July 30, 2015Inventors: Tomomasa Nishikawa, Tetsuhiro Harada, Chikai Yoshimizu, Hiroyuki Hanawa
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Patent number: 9065155Abstract: When a battery pack having an output voltage of 14.4 V that is connectable to an electric tool in a sliding manner is used as a power supply source for the electric tool that is connectable to a battery pack in an insertion manner and has a rated voltage of 12 V, the electric tool and the battery pack are connected to each other with an adaptor interposed therebetween. The adaptor has an FET that is switched at a predetermined duty of a predetermined frequency. The battery pack and the electric tool are connected or disconnected to or from each other by the switching operation, thereby dropping the output voltage of the battery pack. When the detected voltage is out of a predetermined value range, it is judged that the overcurrent or overdischarge has occurred. Then, the FET is turned off to stop the electric tool.Type: GrantFiled: June 22, 2012Date of Patent: June 23, 2015Assignee: HITACHI KOKI CO., LTD.Inventors: Nobuhiro Takano, Yoshikazu Kawano, Kazuhiko Funabashi, Yuuichi Konuma, Masateru Niyada, Chikai Yoshimizu, Eiji Nakayama, Kenro Ishimaru
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Patent number: 8928201Abstract: A motor has an output shaft which is rotatably supported by a housing, a rotor which is fixed to the output shaft and which comprises a printed-wiring board, and a stator which is fixed to the housing and which comprises a magnet facing the rotor. The printed-wiring board comprises a coil/commutator disk and a coil disk. A commutator conductor pattern is formed in a commutator region of the coil/commutator disk. Likewise, coil conductor patterns are formed in respective coil regions of the coil/commutator disk and of the coil disk.Type: GrantFiled: September 22, 2010Date of Patent: January 6, 2015Assignee: Hitachi Koki Co., Ltd.Inventors: Hideyuki Tanimoto, Chikai Yoshimizu, Nobuhiro Takano, Hiromi Ozawa, Kazuhiko Funabashi
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Patent number: 8517558Abstract: A power tool includes a body housing a motor and a power transmission mechanism positioned ahead of the motor for transmitting a power of the motor, a handle grip having an upper end portion connected to an approximately intermediate portion of the body and a lower end portion to which a battery is connected, a light emitting element positioned below the power transmission mechanism and receiving electrical power from the battery for illuminating a portion ahead of the body, and a trigger positioned below the power transmission mechanism for controlling a supply of the electrical power from the battery to the motor and to the light emitting element.Type: GrantFiled: October 19, 2011Date of Patent: August 27, 2013Assignee: Hitachi Koki Co., Ltd.Inventors: Katsuhiro Oomori, Chikai Yoshimizu, Hidekazu Harada, Nobuhiro Takano
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Publication number: 20120262035Abstract: When a battery pack having an output voltage of 14.4 V that is connectable to an electric tool in a sliding manner is used as a power supply source for the electric tool that is connectable to a battery pack in an insertion manner and has a rated voltage of 12 V, the electric tool and the battery pack are connected to each other with an adaptor interposed therebetween. The adaptor has an FET that is switched at a predetermined duty of a predetermined frequency. The battery pack and the electric tool are connected or disconnected to or from each other by the switching operation, thereby dropping the output voltage of the battery pack. When the detected voltage is out of a predetermined value range, it is judged that the overcurrent or overdischarge has occurred. Then, the FET is turned off to stop the electric tool.Type: ApplicationFiled: June 22, 2012Publication date: October 18, 2012Applicant: Hitachi Koki Co., Ltd.Inventors: Nobuhiro TAKANO, Yoshikazu Kawano, Kazuhiko Funabashi, Yuuichi Konuma, Masateru Niyada, Chikai Yoshimizu, Eiji Nakayama, Kenro Ishimaru
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Publication number: 20120199372Abstract: 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: ApplicationFiled: July 29, 2010Publication date: August 9, 2012Applicant: 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
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Patent number: 8237404Abstract: When a battery pack having an output voltage of 14.4 V that is connectable to an electric tool in a sliding manner is used as a power supply source for the electric tool that is connectable to a battery pack in an insertion manner and has a rated voltage of 12 V, the electric tool and the battery pack are connected to each other with an adaptor interposed therebetween. The adaptor has an FET that is switched at a predetermined duty of a predetermined frequency. The battery pack and the electric tool are connected or disconnected to or from each other by the switching operation, thereby dropping the output voltage of the battery pack. The voltage from the battery pack is detected. When the detected voltage is out of a predetermined value range, it is judged that the overcurrent or overdischarge has occurred. Then, the FET is turned off to stop the electric tool.Type: GrantFiled: September 18, 2007Date of Patent: August 7, 2012Assignee: Hitachi Koki Co., Ltd.Inventors: Nobuhiro Takano, Yoshikazu Kawano, Kazuhiko Funabashi, Yuuichi Konuma, Masateru Niyada, Chikai Yoshimizu, Eiji Nakayama, Kenro Ishimaru
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Publication number: 20120139456Abstract: When a main switch (12) is turned ON, an electric operating machine (1) is put in the standby mode. With a trigger (13) being pulled in the standby mode, a power supply circuit (16) applies a voltage to a drive part (30). The power supply circuit (16) adjusts the voltage applied to the drive part (30) for a voltage corresponding to the pulling rate of the trigger (13). When the current running toward the drive part (30) exceeds the rated value of the drive part (30), the power supply circuit (16) automatically stops power supply to the drive part (30). On the other hand, when the output voltage of a battery (50) drops and the battery (50) is put in an overdischarge state, power supply to the drive part (30) is automatically stopped. When it is detected that the battery (50) undergoes an abnormal event, power supply to the drive part (30) is automatically stopped.Type: ApplicationFiled: August 27, 2010Publication date: June 7, 2012Inventors: Nobuhiro Takano, Kazuhiko Funabashi, Hideyuki Tanimoto, Chikai Yoshimizu, Hiromi Ozawa, Yoshihiro Hoshi
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Publication number: 20120104881Abstract: A motor has an output shaft which is rotatably supported by a housing, a rotor which is fixed to the output shaft and which comprises a printed-wiring board, and a stator which is fixed to the housing and which comprises a magnet facing the rotor. The printed-wiring board comprises a coil/commutator disk and a coil disk. A commutator conductor pattern is formed in a commutator region of the coil/commutator disk. Likewise, coil conductor patterns are formed in respective coil regions of the coil/commutator disk and of the coil disk.Type: ApplicationFiled: September 22, 2010Publication date: May 3, 2012Inventors: Hideyuki Tanimoto, Chikai Yoshimizu, Nobuhiro Takano, Hiromi Ozawa, Kazuhiko Funabashi
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Publication number: 20120104983Abstract: An electric grasscutter includes a motor (50) which drives a rotary blade (42). The motor (50) is a brushless motor accommodated in a motor housing (51) and including a rotor (53) provided integrally with an output shaft (52), and a stator (54) fixed to the motor housing (51). A motor control circuit which drives the motor (50) is accommodated in the motor housing (51). The motor control circuit includes an inverter having FETs (81-86) as switching elements, and a control section to control the FETs (81-86). The FETs (81-86) are fixed in contact with the motor housing (51).Type: ApplicationFiled: September 22, 2010Publication date: May 3, 2012Inventors: Hideyuki Tanimoto, Chikai Yoshimizu, Nobuhiro Takano, Hiromi Ozawa, Kazuhiko Funabashi
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Publication number: 20120033405Abstract: A power tool includes a body housing a motor and a power transmission mechanism positioned ahead of the motor for transmitting a power of the motor, a handle grip having an upper end portion connected to an approximately intermediate portion of the body and a lower end portion to which a battery is connected, a light emitting element positioned below the power transmission mechanism and receiving electrical power from the battery for illuminating a portion ahead of the body, and a trigger positioned below the power transmission mechanism for controlling a supply of the electrical power from the battery to the motor and to the light emitting element.Type: ApplicationFiled: October 19, 2011Publication date: February 9, 2012Inventors: Katsuhiro OOMORI, Chikai Yoshimizu, Hidekazu Harada, Nobuhiro Takano
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Publication number: 20110199756Abstract: A power tool includes a motor as a drive power source, a body housing the motor and having an end output unit for chucking an end tool, a handle grip connected to the body; and a light unit disposed to one of the handle grip and the body, and having a light-emitting element for providing illumination near the end tool. The light unit includes an angle adjuster and holder which adjusts and holds a lighting angle of the light-emitting element at least in accordance with a length of the end tool.Type: ApplicationFiled: April 26, 2011Publication date: August 18, 2011Inventors: Katsuhiro OOMORI, Chikai Yoshimizu, Hidekazu Harada, Nobuhiro Takano
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Patent number: 7934847Abstract: A power tool includes a motor as a drive power source, a body housing the motor and having an end output unit for chucking an end tool, a handle grip connected to the body; and a light unit disposed to one of the handle grip and the body, and having a light-emitting element for providing illumination near the end tool. The light unit comprises switch means for switching the light-emitting element on and off, and an off circuit for automatically turning the light-emitting element off at a predetermined time after the light-emitting element turns on.Type: GrantFiled: February 23, 2007Date of Patent: May 3, 2011Assignee: Hitachi Koki Co., Ltd.Inventors: Katsuhiro Oomori, Chikai Yoshimizu, Hidekazu Harada, Nobuhiro Takano
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Publication number: 20110025255Abstract: A solar power system has a charging device. The charging device is powered by a solar cell to charge a battery pack having a secondary cell. The charging device has input voltage detection circuit that detects an input voltage from the solar cell; switching circuit that converts the input voltage to supply a charging current to the battery pack; charging current detection circuit that detects the charging current; and control circuit that controls the switching circuit to change the input voltage in order that a resultant charging current becomes suitable for charging the battery pack.Type: ApplicationFiled: July 29, 2010Publication date: February 3, 2011Applicant: Hitachi Koki Co., Ltd.Inventors: Takao Aradachi, Nobuhiro Takano, Kazuhiko Funabashi, Chikai Yoshimizu, Shigeru Ishikawa, Masanori Aoki