Casings for rocket motors

Claim 1

IN A ROCKET MOTOR, A TWO PART CASING HAVING SUCCESSIVE CONVERGING AND DIVERGING SECTIONS WITH A THROAT THEREBETWEEN TO PROVIDE A NOZZLE AT ONE END THROUGH WHICH THE PROPELLANT GASES ESCAPE, THE PARTS OF THE CASING BEING SEPARABLE TO PROVIDE AN OPENING OF A SIZE SUFFICIENT FOR PERMITING A SOLID PROPELLANT CHARGE TO BE PLACED IN THE CASING FORWARDLY OF THE NOZZLE THROAT, SAID NOZZLE CONVERTING PRESSURE OF PROPELLANT GASES TO THRUST AS IT PASSES THERETHROUGH AND PRODUCING STRESSES LONGITUDINALLY OF THE CASING WHICH CHANGE FROM TENSION TO COMPRESSION ALONG THE CONVERGING SECTION, AND A PERIPHERAL JOINT ON THE CONVERGING SECTION OF THE CASING FOR CONNECTING THE SEPARATE CASING PARTS, SAID JOINT BEING FORMED BY THE ENDS OF THE CASING PARTS TELESCOPED ONE IN THE OTHER AND SO SHAPED AS TO FORM OPPOSING SHOULDERS NORMAL TO AND IN THE PLANE OF THE CONVERGING SECTION, A KEY BETWEEN SAID SHOULDERS TO COMPLETE THE JOINT, AND SAID JOINT BEING LOCATED AT A PLACE ALONG THE INCLINED CONVERGING CASING SECTION NEAREST TO THE POINT OF ZERO LONGITUDINAL LOAD IN THE CASING TO PROVIDE THE MINIMUM OPENING REQUIRED TO INSERT SOLID PROPELLANT CHARGE WHEREBY REDUCING THE LONGITUDINAL STRESS ON THE JOINT TO A MINIMUM.