Patents by Inventor Wan-Fu Wen

Wan-Fu Wen 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).

  • Braking mechanism for nail driver
    Patent number: 7150385
    Abstract: A nail driver includes a cell formed inside a nail cartridge. A braking unit with one end formed as a retaining portion and the other end formed as a contact portion is pivotally installed in the cell. A resilient member is installed in the cell for pressing on the contact portion to swing the retaining portion to a releasing position so that a securing slide rod can freely slide to have the nail drive being actuated when there is any nail in the nail cartridge. When there is no more nail, a nail pusher pushed by a spring makes a protrusion of the nail pusher pressing on the contact portion against the resilient member to swing the retaining portion to a restraining position to block in the moving path of an extending portion of the securing slide so that the nail drive cannot be actuated until the nails are reloaded.
    Type: Grant
    Filed: November 23, 2005
    Date of Patent: December 19, 2006
    Assignee: De Poan Pneumatic Corp.
    Inventor: Wan-Fu Wen