Patents by Inventor Robert Mortensen

Robert Mortensen 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).

  • Device for and method of enlarging and center displacing an opening in a work piece
    Patent number: 5871310
    Abstract: A device (10) for use in combination with a hole saw (12) of the type including a cylindrical hollow body (14) having a circular lower cutting edge (16), a top mandrel (18) with a shank (20) in engagement with a chuck (22) of a drill (24) and a pilot bit (26) for guiding the hole saw (12) when cutting a new opening in a workpiece (28) having a predrilled opening (30), in which the center of the new opening lies within the predrilled opening (30). The device (10) comprises a dowel plug (32) having a plurality of holes (34) therethrough. The dowel plug (32) is inserted into the predrilled opening (30), so that the pilot bit (26) of the hole saw (12) can be positioned in a rotatable manner into one of the holes (34) in the dowel plug (32) on center or off center with the predrilled opening (30) in the workpiece (28).
    Type: Grant
    Filed: March 23, 1998
    Date of Patent: February 16, 1999
    Inventor: Robert Mortensen