Patents by Inventor Qing Hai Xu

Qing Hai Xu 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: 8272305
    Abstract: Present invention teaches to build a woodworking table saw where, a splitter/riving knife move with the saw blade in a synchronized manner, with an idle gear engaging in planetary circular action around a fixed quadrant gear and the outer gear teeth portion of a support arm, so that any height adjustment or angle tilting done to the saw blade will result in the same movement of the splitter/riving knife, maintaining the constant linear difference (usually 5 mm) between the saw blade and the splitter/riving knife. In addition, to facilitate the installation, changeover, and/or removal of the splitter/riving knife, a spring pressure plate mechanism is used, along with lug bolts and a spring loaded secure pin device to easily set the splitter/riving knife in a pre-set position without using tools and in shorter time duration.
    Type: Grant
    Filed: July 27, 2009
    Date of Patent: September 25, 2012
    Assignee: Nanjing Haiwei Machinery Co., Ltd.
    Inventors: Qing Hai Xu, Yi Hua
  • Publication number: 20110017037
    Abstract: Present invention teaches to build a woodworking table saw, responding to the market demand and preference for safer operations that a splitter/riving knife move with the saw blade in a synchronized manner, so that any height adjustment or angle tilting done to the saw blade will result in the same movement of the splitter/riving knife, maintaining the constant linear difference (usually 5 mm) between the saw blade and the splitter/riving knife and constant height difference between top tip of the blade and the splitter/riving knife. In addition, to facilitate the installation, changeover, and/or removal of the splitter/riving knife, a spring pressure plate mechanism is used, along with lug bolts and a spring loaded secure pin device to easily set the splitter/riving knife in a pre-set position without using tools and in shorter time duration.
    Type: Application
    Filed: July 27, 2009
    Publication date: January 27, 2011
    Inventors: Qing Hai Xu, Yi Hua
  • Publication number: 20070237985
    Abstract: Surface coating for cast iron worktables of woodworking machines consists of Physical Vapor Deposition (PVD) process, using the six Titanium Alloy stocks described herein as the coating stock, to increase the rust-prevention and scratch-resistance of the worktable, and thus prolonging the useful life of the woodworking machines.
    Type: Application
    Filed: April 10, 2006
    Publication date: October 11, 2007
    Inventors: Qing Hai XU, Yi Hua