Patents Assigned to Mine Support Systems (Proprietary) Ltd.
  • Elongate compression bearing member
    Patent number: 4520980
    Abstract: A prop intended particularly for use in underground mines, is made of timber. At one or both ends of the prop, a reduced diameter portion is formed. The rest of the prop has a larger diameter. At the end or ends of the larger diameter portion adjacent the reduced diameter portion(s), a restraining ring surrounds the prop.
    Type: Grant
    Filed: November 3, 1980
    Date of Patent: June 4, 1985
    Assignee: Mine Support Systems (Proprietary) Ltd.
    Inventor: Rodney C. Townsend