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:
Jan. 27, 1981
Filed:
Sep. 26, 1978
Kubota, Ltd., Osaka, JP;
Abstract
A rock bolt to be inserted into a bore formed in the ground from the inner periphery of a tunnel and anchored to the ground with grout filled in the space in the bore around the bolt to reinforce the ground. The rock bolt has two grooves extending axially thereof and an elastic tubular member fixedly fitting around the bolt close to one end thereof. A tube having an opening close to the other end of the bolt is provided within one of the grooves. Another tube provided in the other groove has an opening close to one end of the tubular member remote from the above-mentioned one end of the bolt. Before the injection of the grout, the rock bolt can be fixed to the ground easily and reliably by pressing the elastic tubular member into the bore. The grout is filled into the space through one of the tubes while displacing air through the other tube.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile