The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 04, 2020
Filed:
Sep. 21, 2017
Fci Holdings Delaware, Inc., Wilmington, DE (US);
Trent Roberts, Smeaton Grange, AU;
FCI HOLDINGS DELAWARE, INC., Wilmington, DE (US);
Abstract
A rock bolt () is provided for frictionally engaging with the internal surface of a bore drilled into rockmass. The bolt comprises a tube having a circular cross-section () defining a longitudinal split () and a longitudinal axis (). The tube () in is radially expandable. The bolt () has a first leading end () for insertion into a bore, a second end defining a head () and expander means () for expanding the diameter of the tube at least one location along the tube. The expander means comprises first () and second () expander/wedge elements arranged so that relative movement of the two elements causes the diameter of the tube to expand at that location. The first expander element () is mounted on an elongate rod () which is aligned generally along the longitudinal axis of the tube. Rotation of the rod () causes the relative movement of the two elements to cause the diameter of the tube to expand at the location. The rock bolt includes an arrestor () in the form of a ring, which defines an aperture which locates on the proximal end of the rod (). The aperture is larger than the proximal end of the rod so that the arrestor is able to move along the proximal end of the rod. The arrestor includes a laterally extending protrusion () which locates in the longitudinal split () and is narrower than the longitudinal split and which is configured to engage with the head of the friction bolt when moved towards the proximal end of the friction bolt.