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:
May. 09, 1978
Filed:
Sep. 07, 1976
Applicant:
Inventors:
Erik V Lavon, Saltsjo-Boo, SW;
Levi J Karifors, Nacka, SW;
Assignee:
Atlas Copco Aktiebolag, Nacka, SW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21C / ; F42D / ;
U.S. Cl.
CPC ...
299 13 ; 102 23 ; 175-35 ;
Abstract
A hard compact material, such as rock, is broken by delivering an explosive into at least one hole which has been pre-drilled in the material to be broken and by forcing a relatively incompressible fluid, such as water, into the hole to impact the explosive to initiate same. Upon detonation of the explosive the fluid stems the hole thereby delaying leakage of blasting gases out of the hole before the material is broken. Preferably, the explosive and the fluid are launched together into the hole. In this case may the explosive and the fluid be encapsulated in a common cover.