Patents by Inventor Jeng-Da Tsai

Jeng-Da Tsai 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).

  • Impact drill
    Patent number: 8051920
    Abstract: An impact drill includes a housing having an accommodation chamber and a through hole extending from the accommodation chamber to the outside space, a driving mechanism mounted in the accommodation chamber and having a transmission shaft positioned in the through hole for providing an output torque and producing an impact force intermittently upon a resistance, the transmission shaft having a polygonal front segment extending out of the accommodation chamber, and a chuck unit, which has a drill chuck that has a connection barrel defining a polygonal coupling hole that is press-fitted onto the polygonal front segment of the transmission shaft and a first bearing mounted on the connection barrel and received in the through hole to secure the drill chuck to the housing.
    Type: Grant
    Filed: August 7, 2009
    Date of Patent: November 8, 2011
    Assignee: Mobiletron Electronics Co., Ltd.
    Inventors: Kim Y.C. Tsai, Cheng-I Teng, Jeng-Da Tsai
  • IMPACT DRILL
    Publication number: 20110030985
    Abstract: An impact drill includes a housing having an accommodation chamber and a through hole extending from the accommodation chamber to the outside space, a driving mechanism mounted in the accommodation chamber and having a transmission shaft positioned in the through hole for providing an output torque and producing an impact force intermittently upon a resistance, the transmission shaft having a polygonal front segment extending out of the accommodation chamber, and a chuck unit, which has a drill chuck that has a connection barrel defining a polygonal coupling hole that is press-fitted onto the polygonal front segment of the transmission shaft and a first bearing mounted on the connection barrel and received in the through hole to secure the drill chuck to the housing.
    Type: Application
    Filed: August 7, 2009
    Publication date: February 10, 2011
    Applicant: MOBILETRON ELECTRONICS CO., LTD.
    Inventors: Kim Y.C. TSAI, Cheng-I Teng, Jeng-Da Tsai