Patents by Inventor William John Lustgraaf

William John Lustgraaf 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: 4040313
    Abstract: A grinding machine for sharpening circular saw blade teeth. The machine includes an arbor for supporting a circular saw blade at a pre-selected position relative to a grinding disc. The grinding disc is mounted to a parallelogram linkage that has a tracing pin fixed thereto. Movement of the tracing pin over the surface of a sawtooth-shaped template causes corresponding movement of the grinding disc against a selected sawtooth. Also included is a tooth indexing mechanism whereby precise spacing of the circular saw teeth is obtained. This is accomplished by a tooth spacing pattern mounted to the arbor and by an indexing pawl that facilitates rotation of the arbor in precise increments equal to desired spacing for the teeth of the blade being operated on. The arbor is pivotably mounted relative to the grinding disc to enable bevel grinding of the tooth surfaces.
    Type: Grant
    Filed: December 29, 1975
    Date of Patent: August 9, 1977
    Inventor: William John Lustgraaf