Patents by Inventor Haruki TEJIMA
Haruki TEJIMA 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: 11958170Abstract: An impact tool includes: a brushless motor; a spindle, which is rotated by the brushless motor; a hammer, which is held on the spindle; an anvil, which is impacted in a rotational direction by the hammer; a polymer housing, which houses the brushless motor; a hammer case, which is connected to the polymer housing and houses the hammer and the spindle; and a light unit, which is held on the hammer case and comprises a plurality of light-emitting devices. The maximum tightening torque of the anvil is 1,000 N·m or more and 2,500 N·m or less.Type: GrantFiled: November 30, 2022Date of Patent: April 16, 2024Assignee: MAKITA CORPORATIONInventors: Tokuo Hirabayashi, Haruki Tejima, Kazuma Aoki, Kazunori Kinoshita
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Publication number: 20230390914Abstract: An impact tool is less likely to have a shorter service life. An impact tool includes a motor, a spindle, a hammer, an anvil, and a lid. The spindle is rotatable by the motor. The spindle has an opening in a rear end face of the spindle, an internal space extending frontward from the opening and including a first space containing a lubricant oil and a second space connecting to a rear end of the first space, and a first feed port in an outer circumferential surface of the spindle. The hammer surrounds the spindle. The anvil is strikable by the hammer in a rotation direction. The lid is placeable through the opening into the second space. The first feed port allows supply of the lubricant oil from the first space to between the spindle and the hammer.Type: ApplicationFiled: April 20, 2023Publication date: December 7, 2023Applicant: MAKITA CORPORATIONInventors: Juan CHANG, Haohao WANG, Wei YANG, Haruki TEJIMA
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Publication number: 20230182269Abstract: An impact tool includes: a brushless motor; a spindle, which is rotated by the brushless motor; a hammer, which is held on the spindle; an anvil, which is impacted in a rotational direction by the hammer; a polymer housing, which houses the brushless motor; a hammer case, which is connected to the polymer housing and houses the hammer and the spindle; and a light unit, which is held on the hammer case and comprises a plurality of light-emitting devices. The maximum tightening torque of the anvil is 1,000 N·m or more and 2,500 N·m or less.Type: ApplicationFiled: November 30, 2022Publication date: June 15, 2023Inventors: Tokuo HIRABAYASHI, Haruki TEJIMA, Kazuma AOKI, Kazunori KINOSHITA
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Publication number: 20230182270Abstract: An impact tool includes: a brushless motor; a spindle, which is rotated by the brushless motor; a hammer, which is held on the spindle; an anvil, which is impacted in a rotational direction by the hammer; a polymer housing, which houses the brushless motor; a hammer case, which is connected to the polymer housing and houses the hammer and the spindle; and a light unit, which is held on the hammer case and comprises a plurality of light-emitting devices. The maximum tightening torque of the anvil is 1,000 N·m or more and 2,500 N·m or less.Type: ApplicationFiled: November 30, 2022Publication date: June 15, 2023Inventors: Tokuo HIRABAYASHI, Haruki TEJIMA, Kazuma AOKI, Kazunori KINOSHITA
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Patent number: 10974372Abstract: An impact driver includes a hammer that is rotated by a motor and an anvil configured to be struck by the hammer to rotate the anvil about a rotational axis. A hammer case houses the hammer. Two or more bearings are provided inside the hammer case and support the anvil. To inhibit vibration of the anvil during operation, the bearings may be differing types, such as a regular ball bearing and an angular contact ball bearing, and/or the bearings may have different inner and/or outer diameters. A contact member, such as an O-ring, may be disposed in an insertion hole of the anvil to reduce vibrations that are transmitted to the tool bit.Type: GrantFiled: January 18, 2019Date of Patent: April 13, 2021Assignee: MAKITA CORPORATIONInventors: Haruki Tejima, Tomoyuki Kondo, Kenji Abe, Koji Tsukamoto
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Patent number: 10532454Abstract: An electric working machine according to one aspect of the present disclosure includes an output shaft, a motor, a transmitting device, a drive device, a controller, and a current path. The transmitting device has transmittable allowable torque and transmits rotation of the motor to the output shaft. The drive device energizes the motor with electric supply from a battery in accordance with a command from outside the electric working machine. The current path is configured to be able to energize the motor with a current value larger than an allowable current value required to limit torque generated in the transmitting device due to rotation of the motor to the allowable torque or smaller.Type: GrantFiled: May 17, 2017Date of Patent: January 14, 2020Assignee: MAKITA CORPORATIONInventors: Shingo Kamiya, Haruki Tejima, Takao Kuroyanagi, Masanori Higashi
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Publication number: 20190262978Abstract: An impact driver includes a hammer that is rotated by a motor and an anvil configured to be struck by the hammer to rotate the anvil about a rotational axis. A hammer case houses the hammer. Two or more bearings are provided inside the hammer case and support the anvil. To inhibit vibration of the anvil during operation, the bearings may be differing types, such as a regular ball bearing and an angular contact ball bearing, and/or the bearings may have different inner and/or outer diameters. A contact member, such as an O-ring, may be disposed in an insertion hole of the anvil to reduce vibrations that are transmitted to the tool bit.Type: ApplicationFiled: January 18, 2019Publication date: August 29, 2019Inventors: Haruki TEJIMA, Tomoyuki KONDO, Kenji ABE, Koji TSUKAMOTO
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Publication number: 20170334054Abstract: An electric working machine according to one aspect of the present disclosure includes an output shaft, a motor, a transmitting device, a drive device, a controller, and a current path. The transmitting device has transmittable allowable torque and transmits rotation of the motor to the output shaft. The drive device energizes the motor with electric supply from a battery in accordance with a command from outside the electric working machine. The current path is configured to be able to energize the motor with a current value larger than an allowable current value required to limit torque generated in the transmitting device due to rotation of the motor to the allowable toque or smaller.Type: ApplicationFiled: May 17, 2017Publication date: November 23, 2017Applicant: MAKITA CORPORATIONInventors: Shingo KAMIYA, Haruki TEJIMA, Takao KUROYANAGI, Masanori HIGASHI
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Publication number: 20170326720Abstract: A power tool, such as an impact driver, includes a motor housing that houses a motor, and a battery-mount part to which a battery pack having a rated voltage of 18 V is mountable. A ratio of the maximum width of the motor housing to the maximum width of the battery pack is 0.75 or less. A forward/reverse-switching lever is slidable in a left-right direction to change the rotational direction of the motor and is disposed between the motor housing and the battery pack. A maximum-slide position of the forward/reverse-switching lever in the left-right direction is inward of a ground plane when the power tool is laid horizontally on its side on the ground plane.Type: ApplicationFiled: April 18, 2017Publication date: November 16, 2017Inventors: Takao KUROYANAGI, Haruki TEJIMA