Patents Assigned to Coalequip (Proprietary) Limited
  • Drill adaptor
    Patent number: 4638874
    Abstract: The invention provides an adaptor which comprises a hexagonal tail portion adapted to engage in a drilling machine, and a leading portion which is adapted to receive a circular drill rod in locking relationship. Sealing means is provided between the drilling machine and the adaptor and the latter and the drill rod.
    Type: Grant
    Filed: July 26, 1983
    Date of Patent: January 27, 1987
    Assignee: Coalequip (Proprietary) Limited
    Inventors: Stephen G. Dawe, James A. Brews
  • Expansion bolt
    Patent number: 4400122
    Abstract: The invention relates to an expansion bolt of a type having an expansible shell arranged on an elongated stud, with a tapered plug being provided to expand the shell in use. In order to render the bolt more versatile, a spacer is provided between the plug and the expansible shell, the spacer being in the form of finger elements which engage the inner surface of the shell to expand it.
    Type: Grant
    Filed: January 19, 1981
    Date of Patent: August 23, 1983
    Assignee: Coalequip (Proprietary) Limited
    Inventors: Daniel Minnaar, Clive Straughan