Patents by Inventor Jack E. Robertson

Jack E. Robertson 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).

  • Silencing means for rotary cutting tools particularly circular saws
    Patent number: 4137806
    Abstract: Noise output of a rotary cutting tool such as a circular saw blade is substantially reduced by means of a guard which wholly encloses the blade when the blade is not cutting and which comprises fixed and movable imperforate guard members, the movable guard member being movable to expose only the cutting segment of the blade. Inner surfaces of the flat side walls of the guard have sound absorbing means such as a Helmholtz resonator array or a layer of acoustical foam. Modifications of the guard to optimize its silencing effectiveness are disclosed.
    Type: Grant
    Filed: April 27, 1977
    Date of Patent: February 6, 1979
    Assignee: North American Products Corp.
    Inventors: Arthur R. Segal, Jack E. Robertson