Patents by Inventor Tomoyuki KUTSUNA

Tomoyuki KUTSUNA 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).

  • Publication number: 20230405621
    Abstract: A mist blower may include: a liquid nozzle configured to inject liquid stored in a liquid tank into an ejection tube. The liquid nozzle may include: an end surface disposed on a distal end of the liquid nozzle, an ejection opening being defined in the end surface; a side surface constituting at least a part of an outer shape of the liquid nozzle; and a corner part connecting the end surface and the side surface and constituting a corner of the liquid nozzle. At the corner part, a virtual end surface defined by extending the end surface and a virtual side surface defined by extending the side surface may intersect at a first point. Each of a distance from the first point to the end surface and a distance from the first point to the side surface may be equal to or less than 0.3 mm.
    Type: Application
    Filed: June 16, 2023
    Publication date: December 21, 2023
    Applicant: MAKITA CORPORATION
    Inventors: Tomoyuki KUTSUNA, Natsuki TANIMOTO, Ryoji ZAMA, Yuki KOIDE
  • Patent number: 11801882
    Abstract: A handcart may include a drive wheel; a prime mover configured to rotate the drive wheel; a grip portion configured to be gripped by a user; and a visibly noticeable portion that is clearly noticeable from behind the user when the user stands behind the handcart, gripping the grip portion.
    Type: Grant
    Filed: March 25, 2022
    Date of Patent: October 31, 2023
    Assignee: MAKITA CORPORATION
    Inventors: Tomoyuki Kutsuna, Toshihiro Tomita, Susumu Kato, Tomonobu Nashimoto, Kohei Oishi
  • Publication number: 20230284556
    Abstract: A working machine may include: a first blade; a second blade overlapping with the first blade in an up-down direction; and a holding unit configured to hold the first blade and the second blade overlapping each other in the up-down direction. The first blade may be configured to reciprocate in a direction perpendicular to the up-down direction with respect to the second blade. The first blade may include a first elongated hole having a longitudinal direction along the reciprocating direction. The second blade may include a second elongated hole having a longitudinal direction along the reciprocating direction. The holding unit may include: a holding part inserted in the first elongated hole of the first blade and the second elongated hole of the second blade; and an outer sleeve having a cylindrical shape and supported by the holding part such that the outer sleeve is rotatable around the holding part.
    Type: Application
    Filed: March 6, 2023
    Publication date: September 14, 2023
    Applicant: Makita Corporation
    Inventors: Kohei OISHI, Takayoshi IIO, Tomoyuki KUTSUNA, Satoshi TAKAHASHI
  • Publication number: 20230133010
    Abstract: A working machine may include a pair of blades and a prime mover configured to reciprocate the pair of blades relative to each other. Each of the pair of blades may include a plurality of edge portions disposed along a reciprocating direction. Each of the plurality of edge portions of one of the pair of blades may include a slide surface configured to slide with respect to the plurality of edge portions of the other of the pair of blades as the pair of blades reciprocates relative to each other, a first edge surface connected to the slide surface and disposed at a first angle with respect to the slide surface, and a second edge surface connected to the first edge surface and disposed at a second angle with respect to the slide surface. The first angle may be greater than the second angle.
    Type: Application
    Filed: November 1, 2022
    Publication date: May 4, 2023
    Applicant: MAKITA CORPORATION
    Inventors: Tomoyuki KUTSUNA, Mikihiro KITAHARA
  • Publication number: 20230101418
    Abstract: A working machine may include: a conversion mechanism configured to convert motion of a prime mover; a first blade connected to the conversion mechanism; a second blade overlapping with the first blade in an up-down direction and facing a first facing surface of the first blade; a sealing member engaged with a first non-facing surface of the first blade that is opposite to the first facing surface, wherein the sealing member includes a first sealing surface facing the first non-facing surface in the up-down direction; and a cover member facing a second sealing surface of the sealing member that is opposite to the first sealing surface of the sealing member. The sealing member may be disposed forward of the conversion mechanism and configured to suppress the object cut with the first blade and the second blade from moving toward the conversion mechanism between the first blade and the cover member.
    Type: Application
    Filed: September 28, 2022
    Publication date: March 30, 2023
    Applicant: Makita Corporation
    Inventors: Kohei OISHI, Tomoyuki Kutsuna
  • Publication number: 20220408639
    Abstract: A grounding body may be mounted on a cutting blade shaft of a grass cutter. The grounding body may include a mounting part for mounting the grounding body on the cutting blade shaft, wherein a cutting blade is mounted on the cutting blade shaft to be positioned above the grounding body; and a main body coupled to the mounting part and configured to contact a ground. The main body may include a first main body constituted of a first resin; and a second main body constituted of a second resin different from the first resin.
    Type: Application
    Filed: June 28, 2022
    Publication date: December 29, 2022
    Applicant: MAKITA CORPORATION
    Inventors: Tomoyuki Kutsuna, Naoki Fujimatsu, Nozomu Iwamoto
  • Publication number: 20220312681
    Abstract: A gardening trimmer may include: a first blade; a facing member overlapping with the first blade in a second direction perpendicular to a first direction; and a suppressing structure. Grease may be applied to at least a part of a conversion mechanism. The first blade may include: a plurality of first slots; and a plurality of pairs of first connecting portions, wherein each pair of the first connecting portions is disposed at opposite ends of corresponding one of the first slots in a third direction perpendicular to the first and second directions. The suppressing structure may be configured to suppress the grease from moving toward a front end of the first blade in the first direction. The suppressing structure may be disposed on the facing member at a position facing at least one pair of in the second direction when the first blade reciprocates relative to the facing member.
    Type: Application
    Filed: March 29, 2022
    Publication date: October 6, 2022
    Applicant: MAKITA CORPORATION
    Inventors: Tomoyuki KUTSUNA, Mikihiro KITAHARA
  • Patent number: 11419276
    Abstract: A gardening trimmer may include a first blade configured to be driven by a prime mover in a reciprocating manner along a first direction and a guide disposed in a slot of the first blade to guide reciprocating motion of the first blade. The slot includes first and second inner side surfaces opposing each other and extending along the first direction. The guide includes an outer peripheral surface opposing the slot's inner side surfaces. The outer peripheral surface of the guide includes a first portion in contact with the first inner side surface and a second portion in contact with the second inner side surface. The outer peripheral surface of the guide is curved at least at the first and second portions, and curvature radii of the first and second portions are each greater than a half of a distance between the first and second inner side surfaces.
    Type: Grant
    Filed: May 26, 2020
    Date of Patent: August 23, 2022
    Assignee: MAKITA CORPORATION
    Inventors: Mikihiro Kitahara, Tomoyuki Kutsuna, Nozomu Iwamoto, Masayoshi Torihara
  • Patent number: 11390310
    Abstract: A handcart may include a drive wheel; a prime mover configured to rotate the drive wheel; a grip portion configured to be gripped by a user; and a visibly noticeable portion that is clearly noticeable from behind the user when the user stands behind the handcart, gripping the grip portion.
    Type: Grant
    Filed: August 6, 2020
    Date of Patent: July 19, 2022
    Assignee: MAKITA CORPORATION
    Inventors: Tomoyuki Kutsuna, Toshihiro Tomita, Susumu Kato, Tomonobu Nashimoto, Kohei Oishi
  • Publication number: 20220212705
    Abstract: A handcart may include a drive wheel; a prime mover configured to rotate the drive wheel; a grip portion configured to be gripped by a user; and a visibly noticeable portion that is clearly noticeable from behind the user when the user stands behind the handcart, gripping the grip portion.
    Type: Application
    Filed: March 25, 2022
    Publication date: July 7, 2022
    Applicant: Makita Corporation
    Inventors: Tomoyuki KUTSUNA, Toshihiro TOMITA, Susumu KATO, Tomonobu NASHIMOTO, Kohei OISHI
  • Publication number: 20220174869
    Abstract: A lawn mower may include: a blade configured to cut grass; a grass collection unit configured to collect the grass cut by the blade; and a fan configured to generate an air flow that blows the grass cut by the blade toward the grass collection unit. The grass may include heavy grass cut long by the blade and light grass cut short by the blade. Among the heavy grass and the light grass having entered the grass collection unit, the grass collection unit may be configured to collect the heavy grass and discharge the light grass out of the grass collection unit.
    Type: Application
    Filed: December 7, 2021
    Publication date: June 9, 2022
    Applicant: Makita Corporation
    Inventor: Tomoyuki KUTSUNA
  • Publication number: 20220105852
    Abstract: A handcart may include: a front wheel; a rear wheel; a support frame supporting the front wheel and the rear wheel; a receptacle pivotable relative to the support frame; a load sensor configured to detect a load applied to the rear wheel; and a control unit. When the load detected by the load sensor is less than or equal to a predetermined load, the control unit may be configured to determine that the rear wheel is predicted to lift from a ground.
    Type: Application
    Filed: October 6, 2021
    Publication date: April 7, 2022
    Applicant: MAKITA CORPORATION
    Inventors: Koki TERAMOTO, Ryo SUNAZUKA, Tomoyuki KUTSUNA, Susumu KATO, Tomonobu NASHIMOTO, Toshihiro TOMITA
  • Publication number: 20210360863
    Abstract: A gardening trimmer may include: a conversion mechanism configured to convert rotational motion of a prime mover to linear motion along a first direction; a blade configured to move in reciprocating motion relative to a guide bar and including a plurality of slots; and a plurality of guide members each disposed in a corresponding slot of the plurality of slots of the blade. The plurality of slots may include: at least one first slot in which a corresponding guide member of the guide members that is connected to a housing is disposed. A combination of the slots and the guide members may include: a first combination configured to reduce frictional resistance generated by the reciprocating motion; and a second combination configured to reduce vibration generated by the reciprocating motion, and at least one combination of the at least one first slot and its corresponding guide member is the second combination.
    Type: Application
    Filed: May 17, 2021
    Publication date: November 25, 2021
    Applicant: MAKITA CORPORATION
    Inventors: Mikihiro KITAHARA, Tomoyuki KUTSUNA, Nozomu IWAMOTO, Tomoyuki OTA
  • Publication number: 20210039702
    Abstract: A handcart may include a drive wheel; a prime mover configured to rotate the drive wheel; a grip portion configured to be gripped by a user; and a visibly noticeable portion that is clearly noticeable from behind the user when the user stands behind the handcart, gripping the grip portion.
    Type: Application
    Filed: August 6, 2020
    Publication date: February 11, 2021
    Applicant: Makita Corporation
    Inventors: Tomoyuki KUTSUNA, Toshihiro TOMITA, Susumu KATO, Tomonobu NASHIMOTO, Kohei OISHI
  • Publication number: 20200375117
    Abstract: A gardening trimmer may include a first blade configured to be driven by a prime mover in a reciprocating manner along a first direction and a guide disposed in a slot of the first blade to guide reciprocating motion of the first blade. The slot includes first and second inner side surfaces opposing each other and extending along the first direction. The guide includes an outer peripheral surface opposing the slot's inner side surfaces. The outer peripheral surface of the guide includes a first portion in contact with the first inner side surface and a second portion in contact with the second inner side surface. The outer peripheral surface of the guide is curved at least at the first and second portions, and curvature radii of the first and second portions are each greater than a half of a distance between the first and second inner side surfaces.
    Type: Application
    Filed: May 26, 2020
    Publication date: December 3, 2020
    Applicant: MAKITA CORPORATION
    Inventors: Mikihiro KITAHARA, Tomoyuki KUTSUNA, Nozomu IWAMOTO, Masayoshi TORIHARA
  • Patent number: 10590815
    Abstract: The first opening part penetrates the first partition wall that separates the crank chamber and the oil sump chamber. The lubricating device of the engine includes an oil mist generation control part. The oil mist generation control part disperses gas injected from the crank chamber into the oil sump chamber through the first opening part when the crank chamber has a positive pressure or restricts the flow of oil with which the injected gas collides, thereby controlling an amount of oil mist generated in the oil sump chamber.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: March 17, 2020
    Assignee: MAKITA CORPORATION
    Inventors: Tomoyuki Kutsuna, Hiroki Sugiyama
  • Patent number: 9950416
    Abstract: To provide a handle that is effective at achieving both vibration resistance and usability. A handle attached to a tool body of a power tool has: a grip portion; a connecting portion that connects to the tool body; elastic element interposing regions that are formed between the grip portion and the connecting portion; elastic elements disposed in the elastic element interposing regions; a powder filling region formed between the grip portion and connecting portion; and a plurality of powder bodies that fill the powder filling region.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: April 24, 2018
    Assignee: MAKITA CORPORATION
    Inventors: Tomoyuki Kutsuna, Ryo Sunazuka, Yoshitaka Machida, Masahiro Ito
  • Publication number: 20170101908
    Abstract: The first opening part penetrates the first partition wall that separates the crank chamber and the oil sump chamber. The lubricating device of the engine includes an oil mist generation control part. The oil mist generation control part disperses gas injected from the crank chamber into the oil sump chamber through the first opening part when the crank chamber has a positive pressure or restricts the flow of oil with which the injected gas collides, thereby controlling an amount of oil mist generated in the oil sump chamber.
    Type: Application
    Filed: July 25, 2016
    Publication date: April 13, 2017
    Applicant: MAKITA CORPORATION
    Inventors: Tomoyuki KUTSUNA, Hiroki SUGIYAMA
  • Publication number: 20160230621
    Abstract: A lubricating device for an engine is provided. A first opening part penetrates a first partition wall separating a crank chamber and an oil sump chamber. A second opening part penetrates a second partition wall separating the crank chamber and a valve drive chamber. In a lubricating device for an engine, when the pressure in the crank chamber is positive, gas in the crank chamber is injected into the oil sump chamber through the first opening part and impacts oil, thus generating mist oil in the oil sump chamber, and mist oil in the crank chamber passes through the second opening part and is supplied to the valve drive chamber, whereas when the pressure in the crank chamber is negative, mist oil in the oil sump chamber passes through the first opening part and is supplied to the crank chamber.
    Type: Application
    Filed: January 28, 2016
    Publication date: August 11, 2016
    Applicant: MAKITA CORPORATION
    Inventors: Tomoyuki KUTSUNA, Hiroki SUGIYAMA
  • Publication number: 20160075007
    Abstract: To provide a handle that is effective at achieving both vibration resistance and usability. A handle attached to a tool body of a power tool has: a grip portion; a connecting portion that connects to the tool body; elastic element interposing regions that are formed between the grip portion and the connecting portion; elastic elements disposed in the elastic element interposing regions; a powder filling region formed between the grip portion and connecting portion; and a plurality of powder bodies that fill the powder filling region.
    Type: Application
    Filed: April 16, 2014
    Publication date: March 17, 2016
    Inventors: Tomoyuki KUTSUNA, Ryo SUNAZUKA, Yoshitaka MACHIDA, Masahiro ITO