Patents by Inventor Cornelis A. van der Westhuizen

Cornelis A. van der Westhuizen 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: 5330494
    Abstract: A knife 10 comprises a blade holder 12, a blade 24 attached to the holder, and a protective member for the blade. Bias means 54 biasses the protective member into a first position in which protective edges 46, 48 thereof protrude beyond the blade cutting edge, so that the protective member covers the cutting edge. The protective member is movable against the biassing force exerted by the bias means, from the first position to a second position in which the cutting edge is exposed for use. First locking means locking the protective member in its first position, are also provided. The first locking means are adapted to release automatically the protective member on the protective edge of the protective member being placed against a surface to be cut and force being exerted on the blade in the direction of said surface.
    Type: Grant
    Filed: January 22, 1993
    Date of Patent: July 19, 1994
    Assignee: Cornelis A. van der Westhuizen
    Inventors: Cornelis A. van der Westhuizen, Stephanus M. Grobler