Patents Assigned to Heintzman GmbH & Co.
  • Method of and apparatus for supporting an overburden
    Patent number: 4249837
    Abstract: A method and an arrangement are disclosed for supporting a roof of an underground excavation. A hollow prop casing of two or more telescopable sections is erected and telescoped apart until it bears on the floor and the roof. The sections are then biased against the floor and the roof and the prop casing is filled with a hardenable substance which upon hardening forms in the casing a solid column capable of supporting the roof.
    Type: Grant
    Filed: November 3, 1978
    Date of Patent: February 10, 1981
    Assignee: Heintzman GmbH & Co.
    Inventor: Klaus Spies