Patents by Inventor Karl Glawischnig

Karl Glawischnig 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 and mandrel assembly
    Patent number: 5061126
    Abstract: A one piece hole saw assembly with mandrel permanently affixed to the hole saw cup. The mandrel contains a hollow shaft, a locking flange and reinforcing flange which are integrally formed as by machining. The locking flange of the mandrel mates with a locking hole or slot in the top surface of the hole saw cup. The reinforcing flange on the mandrel is welded during manufacture to the top surface of the hole saw cup. A pilot drill bit is inserted into the shaft core and welded to the shaft. The resulting product is a one piece hole saw assembly intended for use by simple insertion of the mandrel or shaft end of the pilot drill into the chuck of a conventional electric drill.
    Type: Grant
    Filed: May 4, 1990
    Date of Patent: October 29, 1991
    Assignee: Rule Industries
    Inventors: William Cain, Ernest Emond, Karl Glawischnig, Robert Grant