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:
Jun. 03, 2008
Filed:
Aug. 01, 2003
Mieczyslaw Stanislaw Rataj, Charlestown, AU;
Otmar Langwadt, Markt Schwaben, DE;
Mieczyslaw Stanislaw Rataj, Charlestown, AU;
Otmar Langwadt, Markt Schwaben, DE;
DYWIDAG-Systems InternationalPty Limited, Bennett's Green, New South Wales, AU;
Abstract
An apparatus () for post-grouting a rock bolt () has an elongate sleeve () adapted to receive a rock bolt () with a first end () thereof extending beyond the sleeve first end () and a second end () thereof extending beyond the sleeve second end (). An end fitting () is attached to the sleeve second end () and has a central aperture () for receiving the rock bolt (). Grout passages () communicate the exterior of the end fitting () with the interior of the sleeve (). A seal means () is displaceable between open and closed positions so as to seal the grout passages (). The seal means () is biased towards the closed position at which the grout passages () are substantially sealed. Injection of grout into the end fitting () via the passages () deflects the seal means () to the open position enabling flow of grout through the passages () and into the sleeve ().