Patents by Inventor David Brunscher

David Brunscher 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).

  • Hole saw with waste plug ejector
    Patent number: 7967535
    Abstract: A hole saw having a tubular cutting portion, a pilot drill bit, an ejection plate disposed within the tubular cutting portion and a compression spring cooperating with the plate further includes a guide structure fixed to the ejection plate and slidingly cooperating with a helical flute of the pilot drill bit. The compression spring and cooperating guide structure provide a combination of linear and rotational ejection of a waste plug from the hole saw. A duel set screw feature facilitates waste plug removal if needed and includes a first set screw frictionally engaged with a flat surface of the drill bit and a second set screw cooperating with a circular groove running about the drill bit.
    Type: Grant
    Filed: August 20, 2008
    Date of Patent: June 28, 2011
    Inventors: Cecil Eiserer, David Brunscher
  • Hole saw with waste plug ejector
    Publication number: 20100047030
    Abstract: A hole saw having a tubular cutting portion, a pilot drill bit, an ejection plate disposed within the tubular cutting portion and a compression spring cooperating with the plate further includes a guide structure fixed to the ejection plate and slidingly cooperating with a helical flute of the pilot drill bit. The compression spring and cooperating guide structure provide a combination of linear and rotational ejection of a waste plug from the hole saw. A duel set screw feature facilitates waste plug removal if needed and includes a first set screw frictionally engaged with a flat surface of the drill bit and a second set screw cooperating with a circular groove running about the drill bit.
    Type: Application
    Filed: August 20, 2008
    Publication date: February 25, 2010
    Inventors: Cecil Eiserer, David Brunscher