Patents by Inventor Zuozi Yu

Zuozi Yu 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).

  • Drill chuck
    Patent number: 10086442
    Abstract: The present invention provides a new drill chuck that resolves the problem that the excessive clamping force of the existing drill chuck makes it inconvenient to open the drill chuck and easily damages the cutters. The new drill chuck comprises a front-body, an after-body, and clamping jaws, wherein a thread is provided on the clamping jaw, the after-body is provided with master gears, slave gears are provided between the clamping jaws and the after-body, the master gear fits with the slave gear, a thread is provided inside the slave gear, and the thread of the slave gear fits with the thread of the clamping jaw.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: October 2, 2018
    Assignee: WEIHAI DAWANG HARDWARE PRODUCTS LIMITED
    Inventors: Yaoting Liu, Zuozi Yu
  • DRILL CHUCK
    Publication number: 20150209871
    Abstract: The present invention provides a new drill chuck that resolves the problem that the excessive clamping force of the existing drill chuck makes it inconvenient to open the drill chuck and easily damages the cutters. The new drill chuck comprises a front-body, an after-body, and clamping jaws, wherein a thread is provided on the clamping jaw, the after-body is provided with master gears, slave gears are provided between the clamping jaws and the after-body, the master gear fits with the slave gear, a thread is provided inside the slave gear, and the thread of the slave gear fits with the thread of the clamping jaw.
    Type: Application
    Filed: July 17, 2012
    Publication date: July 30, 2015
    Applicant: WEIHAI DAWANG HARDWARE PRODUCTS LIMITED
    Inventors: Yaoting Liu, Zuozi Yu