Aligning means for shaped charge perforating apparatus

Claim 1

IN WELL CASING PERFORATING APPARATUS, THE COMBINATION OF AN ENCLOSED, ELONGATED CYLINDRICAL PRESSURE RESISTANT HOUSING ADAPTED TO BE LOWERED INTO A BORE HOLEAND HAVING A PLURALITY OF PORTS FORMED IN THE SIDE WALL THEREOF, A PLURALITY OF CLOSURE MEANS FOR SAID PORTS, EACH OF SAID CLOSURE MEANS HAVING A CYLINDRICAL BORE IN THE INTERIOR WALL THEREOF, A CYLINDRICAL SUPPORT IN SAID HOUSING HAVING A PLURALITY OF OPPOSED APERTURES THEREIN AT LOCATIONS CORRESPONDING TO SAID HOUSING PORTS, A PLURALITY OF SHAPED CHARGE CONTAINERS MOUNTED IN THE APERTURES IN SAID SUPPORT AND HAVING SUBSTANTIALLY CYLINDRICAL OPENINGS AT THE FORWARD ENDS THEREOF OF SUBSTANTIALLY THE SAME DIAMETER AS THE BORES IN SAID CLOSURE MEANS, SHAPED CHARGES IN SAID CONTAINERS EACH HAVING A CAVITY THEREIN FACING A HOUSING PORT AND LINED WITH AN INERT MATERIAL, AND HOLLOW CYLINDRICAL SLEEVE MEANS SNUGLY FITTED WITHIN THE CYLINDRICAL OPENING IN ONE OF SAID CHARGE CONTAINERS AND WITHIN THE BORE IN THE CORRESPONDING CLOSURE MEANS FOR RETAINING SAID CHARGE CONTAINERS IN ACCUATE ALIGNMENT WITH THE CORRESPONDING PORTS IN THE HOUSING.