Patents Assigned to Steffen, Robertson & Kirsten (South Africa) (Pty) Ltd.
  • Rock bolt
    Patent number: 7445406
    Abstract: An anchor device which includes a pipe (16), an elongate member (18) which is partly inside the pipe and which has an end (20) which protrudes from the pipe (16), and a restraining component (22) which is engaged with the protruding end (20). The pipe (16) and the elongate member (18) are shaped with a plurality of deformations along their respective lengths such that the elongate member (18) can only be withdrawn from the tubular member (16) by further deforming the elongate member (18).
    Type: Grant
    Filed: February 25, 2003
    Date of Patent: November 4, 2008
    Assignees: Steffen, Robertson & Kirsten (South Africa) (Pty) Ltd.
    Inventor: William David Ortlepp