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:
Jul. 14, 1992
Filed:
Oct. 10, 1990
Onni Issakainen, Nokia, FI;
Oy Tampella Ab, Tampere, FI;
Abstract
The present invention relates to a method for use in connection with a drilling apparatus for drilling a hole and also filling the drilled hole with a filler. A hole is drilled by using a tubular drill rod with a crushing tool provided at the end of the drill rod, with the crushing tool substantially defining the diameter of the hole to be drilled. A first flushing medium is supplied in the course of drilling, through the hole in the tubular drill rod to at least one opening in the crushing tool and into an annular space defined between the walls of the drilled hole and the outer surface of the drill rod, for carrying crushed material out of the drilled hole. After completion of the drilling operation and removal of the crushed material, a filler is delivered into the hole in the tubular drill rod, into the drilled hole and/or into the ground or bedrock surrounding the hole. A second flushing medium is supplied during the final stage of delivery of the filler such as to remove the remaining filler from the drilling apparatus and the crushing tool prior to any subsequent drilling operation.