Back to results
US 4,787,316 AGranted
Expandable, self-tamping explosive bag
AssigneeEconex, Inc.
InventorsFred C. Drury, Donald J. Westmaas, Philip H. Porter
Life of this patent
Estimating the term…
Abstract
A package for blasting agents including an outer bag of a first diameter formed of a multilayer rupturable paper material and an inner waterproof bag of a second diameter larger than the diameter of the outer bag such that, upon being dropped into a blast hole, the outer bag ruptures allowing the inner bag to expand to the full cross section of the hole without tamping while maintaining the blasting agent in a waterproof condition.
Claims2
An expandable self-tamping bag for blasting agents containing ANFO comprising
- an outer bag of a first diameter formed of a plurality of layers of a rupturable paper material and provided with a plurality of longitudinal perforation lines;
- an inner waterproof bag of a second diameter larger than the diameter of said outer bag, formed of a heat-sealable material having a longitudinal fold therein, disposed within said outer bag with said longitudinal fold in substantial alignment with said perforation lines in said outer bag, adapted to receive a quantity of blasting agent and when filled with blasting agent, is heat sealed at each end thereof;
- whereby when said filled bag is dropped into a blast hole, upon impact said outer bag ruptures longitudinally along said perforation lines and said inner bag expands outwardly at said longitudinal fold to substantially fill the cross-section of said blast hole.
Dependencies are inferred from the claim text.