Patents by Inventor Youfeng Zhang

Youfeng Zhang 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).

  • Self-locking mechanism of manually tightened drill chuck
    Patent number: 8141883
    Abstract: The present invention publicly discloses a self-locking mechanism of a manually tightened drill chuck, including a ratchet wheel, a clamp bearing, at least one resilient pawl, and a clip ring, wherein said ratchet wheel is fixed in connection with the main unit of said manually tightened drill chuck, and on its back there are provided ratchet teeth facing the end surface of said main unit; said clamp bearing is fixed in connection with the outside surface of a screw ring on said manually tightened drill chuck, and the end surface of this clamp bearing is provided with at least one ratchet wheel slot; said resilient pawl is fixed on said ratchet wheel slot, and it includes a protuberance and a tooth piece; and said clip ring includes at least two arc segments that can mutually antagonistically snap onto the front end position of said main unit, the outer perimeter surface of this clip ring is fixed in connection with a front cap of said manually tightened drill chuck, said clip ring is connected with said clam
    Type: Grant
    Filed: April 14, 2006
    Date of Patent: March 27, 2012
    Inventors: Zhenqian Hu, Luwen Zhang, Youfeng Zhang
  • Self-Locking Mechanism of Manually Tightened Drill Chuck
    Publication number: 20080231004
    Abstract: The present invention publicly discloses a self-locking mechanism of a manually tightened drill chuck, including a ratchet wheel, a clamp bearing, at least one resilient pawl, and a clip ring, wherein said ratchet wheel is fixed in connection with the main unit of said manually tightened drill chuck, and on its back there are provided ratchet teeth facing the end surface of said main unit; said clamp bearing is fixed in connection with the outside surface of a screw ring on said manually tightened drill chuck, and the end surface of this clamp bearing is provided with at least one ratchet wheel slot; said resilient pawl is fixed on said ratchet wheel slot, and it includes a protuberance and a tooth piece; and said clip ring includes at least two arc segments that can mutually antagonistically snap onto the front end position of said main unit, the outer perimeter surface of this clip ring is fixed in connection with a front cap of said manually tightened drill chuck, said clip ring is connected with said clam
    Type: Application
    Filed: April 14, 2006
    Publication date: September 25, 2008
    Inventors: Zhenqian Hu, Luwen Zhang, Youfeng Zhang