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. 12, 2025
Filed:
May. 12, 2021
Applicants:
Sandvik Mining and Construction Tools Ab, Sandviken, SE;
Sandvik Mining and Construction Australia Pty Ltd, Milton, AU;
Inventors:
Assignees:
Sandvik Mining and Construction Tools AB, Sandviken, SE;
Sandvik Mining and Construction Australia Pty Ltd, Milton, AU;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21D 21/02 (2006.01); F16B 31/02 (2006.01);
U.S. Cl.
CPC ...
E21D 21/02 (2013.01); F16B 31/028 (2013.01);
Abstract
A tension indication device for a rock bolt includes a support washer, a cover member having a central hole for receiving a trailing portion of the rock bolt, and an indicator substance provided in a first space in the cover member or in a recess in the support washer for facing the nut. Upon rotation of the nut, indicator substance is forced out of the first space such that the indicator substance is visible at inspection of the rock bolt, thereby indicating that the rock bolt has been tensioned.