Patents by Inventor Koshiro HIRAKAWA

Koshiro HIRAKAWA 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: 20230132291
    Abstract: A working tool mounting mechanism for a tractor, includes: an extensible cylinder that is disposed on a tip of a boom of a front loader of the tractor, and comprises a cylinder body and a rod slidable with respect to the cylinder body; engaging parts that are respectively disposed on the cylinder body and the rod, and are each movable between an engagement position and a release position with extension and contraction of the extensible cylinder, the engaging parts each engaging with a working tool detachably attached to the boom at the engagement position, and not engaging with the working tool at the release position; a cover that covers the extensible cylinder from one direction; and a frame that is fixed to the cover and restricts at least one of: movement of the cylinder body and the rod in an extensible direction exceeding a predetermined position with the extension and contraction of the extensible cylinder, and rotation of the extensible cylinder around an axial direction.
    Type: Application
    Filed: October 28, 2022
    Publication date: April 27, 2023
    Applicant: Kubota Corporation
    Inventors: Shin Torii, Koshiro Hirakawa
  • Patent number: 10724205
    Abstract: A front loader includes a working tool and an attachment body to which the working tool is attached, including a lock pin configured to attach and fix the working tool, a lock lever configured to move the lock pin between a releasing position and an attaching position, and a latching portion having a retaining mechanism configured to retain the lock lever at the releasing position and another mechanism configured to move the lock lever to the attaching position.
    Type: Grant
    Filed: December 20, 2018
    Date of Patent: July 28, 2020
    Assignee: KUBOTA CORPORATION
    Inventors: Ryuichi Nadaoka, Yuta Ozeki, Masaki Abe, Koshiro Hirakawa
  • Patent number: 10519623
    Abstract: A stand of a front loader includes: a main body that is disposed on a boom and swings between a supporting position in which the main body supports a front loader and a storage position in which the main body is stored; a grounding-member swing shaft that is disposed on the main body and engages with the boom to hold the main body in the storage position; a swinging member swingably disposed on the boom; and an engagement lever disposed on the swinging member, wherein the main body has a guiding hole that guides the engagement lever to regulate a swinging range of the main body.
    Type: Grant
    Filed: April 11, 2019
    Date of Patent: December 31, 2019
    Assignee: Kubota Corporation
    Inventors: Ryuichi Nadaoka, Yuta Ozeki, Koshiro Hirakawa
  • Publication number: 20190323202
    Abstract: A stand of a front loader includes: a main body that is disposed on a boom and swings between a supporting position in which the main body supports a front loader and a storage position in which the main body is stored; a grounding-member swing shaft that is disposed on the main body and engages with the boom to hold the main body in the storage position; a swinging member swingably disposed on the boom; and an engagement lever disposed on the swinging member, wherein the main body has a guiding hole that guides the engagement lever to regulate a swinging range of the main body.
    Type: Application
    Filed: April 11, 2019
    Publication date: October 24, 2019
    Applicant: Kubota Corporation
    Inventors: Ryuichi Nadaoka, Yuta Ozeki, Koshiro Hirakawa
  • Publication number: 20190194903
    Abstract: A front loader includes a working tool and an attachment body to which the working tool is attached, including a lock pin configured to attach and fix the working tool, a lock lever configured to move the lock pin between a releasing position and an attaching position, and a latching portion having a retaining mechanism configured to retain the lock lever at the releasing position and another mechanism configured to move the lock lever to the attaching position.
    Type: Application
    Filed: December 20, 2018
    Publication date: June 27, 2019
    Applicant: KUBOTA CORPORATION
    Inventors: Ryuichi NADAOKA, Yuta OZEKI, Masaki ABE, Koshiro HIRAKAWA