Patent ID: 7343984

Claim:
A core sample collector comprising: a cylinder extending in a vertical direction, a piston which is movably arranged within the cylinder, and which includes a piston body, sterilizing agent-applying means for applying a sterilizing agent to an inner peripheral wall surface of the cylinder, and at least one sterilizing agent-scraping member for scraping the sterilizing agent from the inner peripheral wall surface of the cylinder after the sterilizing agent has been applied by the sterilizing agent-applying means as the piston moves within the cylinder, wherein the at least one sterilizing agent-scraping member comprises an upper piston ring and a lower piston ring, wherein the upper piston ring and lower piston ring are both arranged to project outward in a radial direction from an outer peripheral surface of the piston body and to slidably contact the inner peripheral wall surface of the cylinder, and wherein the sterilizing agent-applying means comprises sterilizing agent arranged in a space defined between the piston, the cylinder, the upper piston ring and the lower piston ring.