Patents Assigned to Dywidag-Systems International Pty Limited
  • Patent number: 11236613
    Abstract: An encapsulation system for use in securing a rock bolt in a bore hole drilled into a rock face to be stabilised, the encapsulation system comprising at least two separate encapsulation mediums and one or more elongate cartridges containing the encapsulation mediums, each the cartridge having a frangible casing, the encapsulation mediums including: a first encapsulation medium comprising a curable first resin formulation; and a second encapsulation medium; wherein, following use in securing a rock bolt, the second encapsulation medium has a lower bond strength and/or a lower compressive strength than the first resin formulation.
    Type: Grant
    Filed: September 7, 2018
    Date of Patent: February 1, 2022
    Assignee: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITED
    Inventors: David William Evans, Derek Colin Hird
  • Publication number: 20200300089
    Abstract: An encapsulation system (100) for use in securing a rock bolt in a bore hole drilled into a rock face to be stabilised, said encapsulation system comprising at least two separate encapsulation mediums (112,122) and one or more elongate cartridges (110,120) containing said encapsulation mediums (112,122), each said cartridge having a frangible casing (111,121), said encapsulation mediums including: a first encapsulation medium (112) comprising a curable first resin formulation; and a second encapsulation medium (122); wherein, following use in securing a rock bolt, said second encapsulation medium has a lower bond strength and/or a lower compressive strength than said first resin formulation.
    Type: Application
    Filed: September 7, 2018
    Publication date: September 24, 2020
    Applicant: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITED
    Inventors: David William EVANS, Derek Colin HIRD
  • Patent number: 10066483
    Abstract: A friction bolt assembly has a tubular friction bolt body defining a cavity and having a split. A rod extends through the cavity. An expansion element is mounted on the rod at or toward the rod leading end and protrudes through the friction bolt body leading end. The expansion element has an engagement surface tapering toward the rod trailing end. A drive head is mounted on the rod at or adjacent the rod trailing end. The rod is actuatable by rotation of the drive head to draw the expansion element toward the friction bolt body trailing end such that the engagement surface engages the friction bolt body, radially outwardly deforming the friction bolt body.
    Type: Grant
    Filed: July 29, 2014
    Date of Patent: September 4, 2018
    Assignee: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITED
    Inventors: David William Evans, Derek Colin Hird
  • Publication number: 20110002746
    Abstract: A method of assessing a multilayer strata (1) for rock bolt installation through a strata face (2) of said strata (1), comprises measuring potential differences between a first layer (3) of the strata (1) and each of one or more further layers (4, 5, 6, 7) of the strata (1).
    Type: Application
    Filed: June 11, 2010
    Publication date: January 6, 2011
    Applicant: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITED
    Inventor: David W. Evans
  • Patent number: 7458242
    Abstract: An apparatus for manufacturing a cable bolt from a cable (1) includes first and second clamps (2, 3) adapted to releasably clamp the cable (1) with the cable (1) extending along the longitudinal axis (4) of the apparatus. A first cable displacement device (12) longitudinally displaces the first clamp (2) relative to the second clamp (3) along the longitudinal axis (4). A first clamp rotation device (14) rotates the first clamp (2) relative to the second clamp (3) about the longitudinal axis (4). The apparatus also has a second clamp displacement device (19) for simultaneously longitudinally displacing the first and second clamps (2, 3) along the longitudinal axis (4).
    Type: Grant
    Filed: September 6, 2005
    Date of Patent: December 2, 2008
    Assignee: Dywidag-Systems International Pty Limited
    Inventors: Mieczyslaw S. Rataj, Alan Henderson, Albert Taylor
  • Patent number: 7338234
    Abstract: A rock bolt (1) comprises a tubular body (4) defining a tubular bore (5) for receiving an adhesive or cement filled cartridge (18). A plug (8) is mounted in the bore (5). The plug (8) is displaceable along the bore (5) and sealingly engages the tubular body (4). A bolt head (7) is located at or adjacent a second end (3) of the rock bolt (1). A detent arrangement (10, 12) restrains the plug (8) in a position adjacent an opening at the first end (2) of the rock bolt (1).
    Type: Grant
    Filed: December 16, 2005
    Date of Patent: March 4, 2008
    Assignee: Dywidag-Systems International Pty Limited
    Inventors: Mieczyslaw Stanislaw Rataj, Andrew Boychuk
  • Publication number: 20060153645
    Abstract: A rock bolt (1) comprises a tubular body (4) defining a tubular bore (5) for receiving an adhesive or cement filled cartridge (18). A plug (8) is mounted in the bore (5). The plug (8) is displaceable along the bore (5) and sealingly engages the tubular body (4). A bolt head (7) is located at or adjacent a second end (3) of the rock bolt (1). A detent arrangement (10, 12) restrains the plug (8) in a position adjacent an opening at the first end (2) of the rock bolt (1).
    Type: Application
    Filed: December 16, 2005
    Publication date: July 13, 2006
    Applicant: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITED
    Inventors: Mieczyslaw Rataj, Andrew Boychuk
  • Publication number: 20060054748
    Abstract: An apparatus for manufacturing a cable bolt from a cable (1) includes first and second clamps (2, 3) adapted to releasably clamp the cable (1) with the cable (1) extending along the longitudinal axis (4) of the apparatus. A first cable displacement device (12) longitudinally displaces the first clamp (2) relative to the second clamp (3) along the longitudinal axis (4). A first clamp rotation device (14) rotates the first clamp (2) relative to the second clamp (3) about the longitudinal axis (4). The apparatus also has a second clamp displacement device (19) for simultaneously longitudinally displacing the first and second clamps (2, 3) along the longitudinal axis (4).
    Type: Application
    Filed: September 6, 2005
    Publication date: March 16, 2006
    Applicant: DYWIDAG-SYSTEMS INTERNATIONAL PTY LIMITED
    Inventors: Mieczyslaw Rataj, Alan Henderson, Albert Taylor