Patent ID: 8171837

Claim:
A pressure container for disposing of an object to be treated by a blasting operation performed therein, said pressure container comprising: a sealable outer vessel constituting an outer shell of said pressure container; and an inner vessel disposed inside said outer vessel for receiving an impact load produced at the time of the blasting operation; wherein said inner vessel includes a main inner vessel body and an inner lid, the main inner vessel body has an inner opening, the inner lid is provided outside of the main inner vessel body and faces the inner opening, the main inner vessel body and the inner lid are separated from each other so that a gap is formed between an end edge of the main inner vessel body surrounding the inner opening and a circumferential edge of the inner lid facing the end edge of the main inner vessel body, the gap serves as a pressure relieving part which can discharge part of high-pressure gas produced in said inner vessel at the time of blasting operation into a gap between said inner vessel and said outer vessel, and the inner lid is disposed inside the outer vessel in such a manner that the inner lid can be displaced outwardly in response to said blasting relative to the main inner vessel body so that the gap between the end edge of the main inner vessel body and the circumferential edge of the inner lid spreads out in response to said blasting, said outer vessel includes a main outer vessel body and an outer lid, the main outer vessel body has an interior space for housing the inner vessel and an outer opening communicated with the interior space, the outer lid closes up the outer opening so that the main outer vessel body is sealed off.