Patents by Inventor Hans G. Follert

Hans G. Follert 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).

  • Cutting appliances for use in tunnel driving operations
    Patent number: 4556256
    Abstract: In a tunnel driving apparatus, and particularly such apparatus where a work face is supported by fluid, a cutting appliance is employed which is composed of a swinging arm carrying a cutter head. The arm can range over the face to detach material therefrom with the cutter head. Means for driving the cutter head is accommodated entirely within the arm itself and a conduit or the like extends through the arm and serves optionally to remove debris by suction or to convey pressure fluid to the face to assist the cutter head.
    Type: Grant
    Filed: August 1, 1983
    Date of Patent: December 3, 1985
    Assignee: Gewerkschaft Eisenhutte Westfalia
    Inventors: Hans G. Follert, Herbert Rzepka, Martin Schwert
  • Tunnel drive shield
    Patent number: 4122683
    Abstract: A tunnel drive shield is provided with a plurality of bracing units spaced around its periphery. The bracing units are expansible against the surrounding tunnel wall to control the direction of shield advance. A bracing unit is provided in each of the four shield quadrants defined by the vertical and horizontal center planes of the shield. Each of the bracing units is expansible in a non-radial direction.
    Type: Grant
    Filed: April 8, 1977
    Date of Patent: October 31, 1978
    Assignee: Gewerkschaft Eisenhutte Westfalia
    Inventors: Hans G. Follert, Klaus Linde, Hans Jutte