Patents by Inventor Mandius C. Lundal

Mandius C. Lundal 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: 4818025
    Abstract: A self-propelled mining vehicle is disclosed which is self supporting above the floor of a mine tunnel. The vehicle is adapted to be supported above the floor of the mine tunnel such that conventional rock removing vehicles are operable therebeneath. The vehicle has an elongated carrier or frame having a mining apparatus mounted at one end. Four transverse bracing cap assemblies are included, and are adapted to engage side walls of a mine tunnel for supporting the carrier above the tunnel floor. Four suspension links extend downwardly from each cap assembly for suspending the carrier beneath the cap assemblies. The suspension links are longitudinally movable with respect to the carrier and cap assemblies for causing movement of the carrier and cap assemblies relative to one another. With such a construction, the vehicle is able to hold its position above a mine tunnel floor without contacting the floor.
    Type: Grant
    Filed: November 14, 1986
    Date of Patent: April 4, 1989
    Assignee: Hecla Mining Company
    Inventors: Mandius C. Lundal, Fred W. Brackebusch