Patents by Inventor Tatsuo Nakashima
Tatsuo Nakashima 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: 11927361Abstract: An indoor unit includes a housing that houses an electrical-component storage box that includes a body portion, a lid portion, and an engagement mechanism portion that engages the body portion and the lid portion with each other in a detachable manner. The lid portion covers an open region on a side of the body portion. The engagement mechanism portion includes an engagement claw portion provided at one of the body and lid portions and an engagement hole portion into which the claw portion is inserted, and which is formed at the other of the body and lid portions.Type: GrantFiled: February 22, 2019Date of Patent: March 12, 2024Assignee: Mitsubishi Electric CorporationInventors: Hiroki Nakashima, Keisuke Tomomura, Tatsuo Furuta
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Patent number: 11919138Abstract: An impact tool (1) includes: a motor (10); an impact mechanism (15), which is rotatable about an output rotational axis (BX) and is driven by the motor; an anvil (16) having an anvil shaft (113) disposed forward of the impact mechanism; and at least one anvil projection (114) protruding radially outward from a rear-end portion of the anvil shaft and configured to be impacted by the impact mechanism in a rotational direction; a hammer case (6) housing the impact mechanism; a main-body housing (2) disposed rearward of, and fixed to, the hammer case; a grip housing (3) having at least a portion disposed rearward of the main-body housing, the grip housing being coupled to the main-body housing so as to be movable relative to the main-body housing; and at least one vibration-isolating member (138, 139) disposed between the main-body housing and the grip housing.Type: GrantFiled: October 5, 2022Date of Patent: March 5, 2024Assignee: MAKITA CORPORATIONInventor: Tatsuo Nakashima
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Patent number: 11759938Abstract: An impact tool (1) includes: a motor (10); an impact mechanism (115), which is rotatable about an output rotational axis (BX) and is operably driven by the motor; an anvil (16) having an anvil shaft (113) disposed forward of the impact mechanism, and a radially-outward-protruding anvil projection (114) that is impacted in a rotational direction by the impact mechanism; a hammer case (6) housing the impact mechanism; an anvil bearing (115) held by the hammer case and surrounding the anvil shaft; a first groove (121) formed on an outer-circumferential surface of the anvil shaft so as to encircle the output rotational axis; a second groove (122) formed on an inner-circumferential surface of the anvil bearing so as to encircle the output rotational axis; and a restraining member (123) having a first portion (124) disposed in the first groove, and a second portion (125) disposed in the second groove.Type: GrantFiled: October 5, 2022Date of Patent: September 19, 2023Assignee: MAKITA CORPORATIONInventor: Tatsuo Nakashima
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Patent number: 11684985Abstract: A suspending member, such as a tether strap or the like, may by connected to improve convenience for an operator. The function of the suspending member shall be reliably performed by clearly notifying the user when the connecting part for connecting the suspending member is damaged. A ring-shaped notification member is incorporated in a connecting part for connecting the suspending member. The suspending member is inserted into both of a connecting hole in a connecting part and a notification member so as to be connected. When an end of a handle portion breaks due to long-term use, the notification member is pulled out such that the damage of the connecting part is notified.Type: GrantFiled: February 19, 2019Date of Patent: June 27, 2023Assignee: MAKITA CORPORATIONInventors: Tatsuo Nakashima, Kenji Nose, Takuji Kimura
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Patent number: 11642772Abstract: A power tool (1), such as an impact wrench (1), includes: a brushless motor (8); a motor housing (7), which houses the brushless motor (8); an anvil (4), which is rotationally driven by the brushless motor (8) and disposed forward of the brushless motor (8); a handle (3), which is disposed downward of the motor housing (7); a battery-mount part (5), which is disposed downward of the handle (3); a battery pack (6), which is mounted on the battery-mount part (5) by being slid relative to the battery-holding housing (5); and a controller (70) for controlling the brushless motor (8). A switch panel (73) having at least one manipulatable button (73c) and at least one display part is provided downward of the handle (3) and is tilted such that the switch panel (73) is higher in the front.Type: GrantFiled: July 16, 2020Date of Patent: May 9, 2023Assignee: MAKITA CORPORATIONInventor: Tatsuo Nakashima
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Publication number: 20230117577Abstract: An impact tool (1) includes: a motor (10); an impact mechanism (115), which is rotatable about an output rotational axis (BX) and is operably driven by the motor; an anvil (16) having an anvil shaft (113) disposed forward of the impact mechanism, and a radially-outward-protruding anvil projection (114) that is impacted in a rotational direction by the impact mechanism; a hammer case (6) housing the impact mechanism; an anvil bearing (115) held by the hammer case and surrounding the anvil shaft; a first groove (121) formed on an outer-circumferential surface of the anvil shaft so as to encircle the output rotational axis; a second groove (122) formed on an inner-circumferential surface of the anvil bearing so as to encircle the output rotational axis; and a restraining member (123) having a first portion (124) disposed in the first groove, and a second portion (125) disposed in the second groove.Type: ApplicationFiled: October 5, 2022Publication date: April 20, 2023Inventor: Tatsuo NAKASHIMA
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Publication number: 20230121902Abstract: An impact tool (1) includes: a motor (10); an impact mechanism (15), which is rotatable about an output rotational axis (BX) and is driven by the motor; an anvil (16) having an anvil shaft (113) disposed forward of the impact mechanism; and at least one anvil projection (114) protruding radially outward from a rear-end portion of the anvil shaft and configured to be impacted by the impact mechanism in a rotational direction; a hammer case (6) housing the impact mechanism; a main-body housing (2) disposed rearward of, and fixed to, the hammer case; a grip housing (3) having at least a portion disposed rearward of the main-body housing, the grip housing being coupled to the main-body housing so as to be movable relative to the main-body housing; and at least one vibration-isolating member (138, 139) disposed between the main-body housing and the grip housing.Type: ApplicationFiled: October 5, 2022Publication date: April 20, 2023Inventor: Tatsuo NAKASHIMA
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Patent number: 11618151Abstract: A power tool (1), such as an impact wrench (1), includes: a brushless motor (8); a motor housing (7), which houses the brushless motor (8); an anvil (4), which is rotationally driven by the brushless motor (8) and disposed forward of the brushless motor (8); a handle (3), which is disposed downward of the motor housing (7); a battery-mount part (5), which is disposed downward of the handle (3); a battery pack (6), which is mounted on the battery-mount part (5) by being slid relative to the battery-holding housing (5); and a controller (70) for controlling the brushless motor (8). A switch panel (73) having at least one manipulatable button (73c) and at least one display part is provided downward of the handle (3) and is tilted such that the switch panel (73) is higher in the front.Type: GrantFiled: July 16, 2020Date of Patent: April 4, 2023Assignee: MAKITA CORPORATIONInventor: Tatsuo Nakashima
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Patent number: 11453109Abstract: The durability of a reduction mechanism is improved. An impact wrench includes a brushless motor, a sun gear rotatable by the brushless motor, a planetary gear meshing with the sun gear, an internal gear meshing with the planetary gear and having a first recess on an outer circumference, a gear case holding the internal gear and having a second recess on an inner circumference, a spindle holding the planetary gear, and a pin disposed in the first recess and in the second recess.Type: GrantFiled: December 6, 2019Date of Patent: September 27, 2022Assignee: MAKITA CORPORATIONInventor: Tatsuo Nakashima
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Patent number: 11073203Abstract: A spindle is radially and axially compact. An impact wrench includes a motor, a sun gear rotatable by the motor, a planetary gear meshing with the sun gear, an internal gear meshing with the planetary gear, a gear case holding the internal gear, a spindle holding the planetary gear, and a first bearing located between the gear case and the spindle, and supporting the spindle on an outer circumference and the gear case on an inner circumference.Type: GrantFiled: December 5, 2019Date of Patent: July 27, 2021Assignee: MAKITA CORPORATIONInventor: Tatsuo Nakashima
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Patent number: 10913174Abstract: A controller 50 is disposed to the front relative to a rotation shaft 11d of an electric motor 11 above a base 2, so as to be tilted in the up-to-down direction as it extends frontward.Type: GrantFiled: October 31, 2018Date of Patent: February 9, 2021Assignee: MAKITA CORPORATIONInventor: Tatsuo Nakashima
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Publication number: 20210016428Abstract: A power tool (1), such as an impact wrench (1), includes: a brushless motor (8); a motor housing (7), which houses the brushless motor (8); an anvil (4), which is rotationally driven by the brushless motor (8) and disposed forward of the brushless motor (8); a handle (3), which is disposed downward of the motor housing (7); a battery-mount part (5), which is disposed downward of the handle (3); a battery pack (6), which is mounted on the battery-mount part (5) by being slid relative to the battery-holding housing (5); and a controller (70) for controlling the brushless motor (8). A switch panel (73) having at least one manipulatable button (73c) and at least one display part is provided downward of the handle (3) and is tilted such that the switch panel (73) is higher in the front.Type: ApplicationFiled: July 16, 2020Publication date: January 21, 2021Inventor: Tatsuo NAKASHIMA
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Publication number: 20210001418Abstract: A suspending member, such as a tether strap or the like, may by connected to improve convenience for an operator. The function of the suspending member shall be reliably performed by clearly notifying the user when the connecting part for connecting the suspending member is damaged. A ring-shaped notification member is incorporated in a connecting part for connecting the suspending member. The suspending member is inserted into both of a connecting hole in a connecting part and a notification member so as to be connected. When an end of a handle portion breaks due to long-term use, the notification member is pulled out such that the damage of the connecting part is notified.Type: ApplicationFiled: February 19, 2019Publication date: January 7, 2021Applicant: MAKITA CORPORATIONInventors: Tatsuo NAKASHIMA, Kenji NOSE, Takuji KIMURA
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Patent number: 10722960Abstract: A dust collection nozzle extends from the front of a fixing cover parallel to a base below an upper end of an electric motor. Heavy and large cutting dust can be immediately collected from an area relatively close to a cutting position of a portable cutting device cutting a workpiece immediately after dust is generated due to the cutting, which can in turn improve dust collection efficiency of a dust collection device to which the dust collection nozzle is attached.Type: GrantFiled: February 20, 2018Date of Patent: July 28, 2020Assignee: MAKITA CORPORATIONInventors: Sho Kume, Hirotomo Inayoshi, Tatsuo Nakashima, Tsutomu Naito, Kenji Nose
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Publication number: 20200217412Abstract: A spindle is radially and axially compact. An impact wrench includes a motor, a sun gear rotatable by the motor, a planetary gear meshing with the sun gear, an internal gear meshing with the planetary gear, a gear case holding the internal gear, a spindle holding the planetary gear, and a first bearing located between the gear case and the spindle, and supporting the spindle on an outer circumference and the gear case on an inner circumference.Type: ApplicationFiled: December 5, 2019Publication date: July 9, 2020Applicant: MAKITA CORPORATIONInventor: Tatsuo NAKASHIMA
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Publication number: 20200215678Abstract: The durability of a reduction mechanism is improved. An impact wrench includes a brushless motor, a sun gear rotatable by the brushless motor, a planetary gear meshing with the sun gear, an internal gear meshing with the planetary gear and having a first recess on an outer circumference, a gear case holding the internal gear and having a second recess on an inner circumference, a spindle holding the planetary gear, and a pin disposed in the first recess and in the second recess.Type: ApplicationFiled: December 6, 2019Publication date: July 9, 2020Applicant: MAKITA CORPORATIONInventor: Tatsuo NAKASHIMA
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Patent number: 10486251Abstract: A pressing member is rotatably supported by a fixing screw shaft via a ball bearing. The pressing member is made of synthetic resin and is larger in diameter compared to that of the fixing screw shaft. A connection bar is pressed by the pressing member by fastening the fixing screw shaft, and the position of the connection bar is thereby fixed. Because the pressing member has a large diameter, a dent is not generated on the connection bar. Furthermore, because the pressing member is not rotated in the fixed position, the position of the connection bar is not offset, enhancing the ability of fixing the connection bar with precise adjustment.Type: GrantFiled: April 13, 2017Date of Patent: November 26, 2019Assignee: MAKITA CORPORATIONInventor: Tatsuo Nakashima
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Publication number: 20190143555Abstract: A controller 50 is disposed to the front relative to a rotation shaft 11d of an electric motor 11 above a base 2, so as to be tilted in the up-to-down direction as it extends frontward.Type: ApplicationFiled: October 31, 2018Publication date: May 16, 2019Applicant: MAKITA CORPORATIONInventor: Tatsuo NAKASHIMA
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Publication number: 20180236574Abstract: A dust collection nozzle 60 extends from the front of a fixing cover 14 parallel to a base 2 below an upper end of an electric motor 25. Heavy and large cutting dust can be immediately collected from an area relatively close to a cutting position C of a portable cutting device 1 cutting a workpiece W immediately after dust is generated due to the cutting, which can in turn improve dust collection efficiency of a dust collection device to which the dust collection nozzle 60 is attached.Type: ApplicationFiled: February 20, 2018Publication date: August 23, 2018Applicant: MAKITA CORPORATIONInventors: Sho KUME, Hirotomo INAYOSHI, Tatsuo NAKASHIMA, Tsutomu NAITO, Kenji NOSE
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Patent number: D936441Type: GrantFiled: May 19, 2020Date of Patent: November 23, 2021Assignee: MAKITA CORPORATIONInventors: Wataru Suzuki, Tatsuo Nakashima