Self-stemming cartridge
First Claim
1. A cartridge which includes an elongate tube having a central body closed at each end and containing a gas producing substance, wherein the elongate tube is made of a plastics material capable of outward deformation, the cartridge further including two discrete bands of an elastically deformable material, each band being towards a different end thereof and the bands not extending along an entire central zone of the elongate tube, configured so that, in use, internal pressure in the elongate tube caused by initiation of the gas producing substance results in outward deformation of the central body and the bands being effectively urged into sealing contact with a surrounding wall of a borehole to stem the borehole prior to any subsequent rupture of the elongate tube or dislodgement of any closure from the elongate tube.
1 Assignment
0 Petitions
Accused Products
Abstract
A cartridge (1) is provided which includes an elongate tube (3) having a central body (5) that is closed at each end (11, 13) and containing a gas producing substance (30) therein. The tube (3) is made from a plastics material that is capable of outward deformation and a band (15) of an elastically deformable material is provided about the tube (3) adjacent each closed end. The tube (3) is configured such that internal pressure in the tube (3) caused by initiation of the gas producing substance (30) results in outward deformation of the body (5) and each band (15) and subsequent rupture of the body (5) prior to the closed ends being ruptured or opened.
15 Citations
13 Claims
- 1. A cartridge which includes an elongate tube having a central body closed at each end and containing a gas producing substance, wherein the elongate tube is made of a plastics material capable of outward deformation, the cartridge further including two discrete bands of an elastically deformable material, each band being towards a different end thereof and the bands not extending along an entire central zone of the elongate tube, configured so that, in use, internal pressure in the elongate tube caused by initiation of the gas producing substance results in outward deformation of the central body and the bands being effectively urged into sealing contact with a surrounding wall of a borehole to stem the borehole prior to any subsequent rupture of the elongate tube or dislodgement of any closure from the elongate tube.
Specification