Patents by Inventor Yeong-Fa Lai

Yeong-Fa Lai 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).

  • Patent number: 6966239
    Abstract: A driving shaft for a ratchet spanner includes a shaft body and a sleeve-retaining member. The shaft body includes a polygonal driving end that is adapted to be received fittingly within a wrench sleeve and that has an end surface with a polygonal screwdriver-engaging groove adapted for receiving a head of a screwdriver fittingly, and an annular outer surface that is formed with a hole communicated with the screwdriver-engaging groove in the end surface. A sleeve-retaining member is disposed within the screwdriver-engaging groove in the shaft body, and has an integral projection that extends through the hole in the shaft body and that is adapted to be biased to press against the wrench sleeve so as to retain the wrench sleeve on the driving end of the shaft body.
    Type: Grant
    Filed: April 15, 2004
    Date of Patent: November 22, 2005
    Assignee: Gau Jiing Industrial Co., Ltd.
    Inventor: Yeong-Fa Lai
  • Publication number: 20050132846
    Abstract: A driving shaft for a ratchet spanner includes a shaft body and a sleeve-retaining member. The shaft body includes a polygonal driving end that is adapted to be received fittingly within a wrench sleeve and that has an end surface with a polygonal screwdriver-engaging groove adapted for receiving a head of a screwdriver fittingly, and an annular outer surface that is formed with a hole communicated with the screwdriver-engaging groove in the end surface. A sleeve-retaining member is disposed within the screwdriver-engaging groove in the shaft body, and has an integral projection that extends through the hole in the shaft body and that is adapted to be biased to press against the wrench sleeve so as to retain the wrench sleeve on the driving end of the shaft body.
    Type: Application
    Filed: April 15, 2004
    Publication date: June 23, 2005
    Inventor: Yeong-Fa Lai