Patent ID: 8367024

Claim:
A test tube holder comprising: a holder body including a cylindrical wall defining a cylindrical hollow portion which accommodates a test tube; at least three guide grooves which are arranged at regular circumferential intervals in the cylindrical wall of the holder body and open on the inner peripheral side and upper end surface side of the cylindrical wall; cam grooves located opposite one another in those surfaces of the cylindrical wall which face the guide grooves and inclined obliquely upward, extending from an outer peripheral portion of the cylindrical wall toward an inner peripheral portion thereof; a plurality of holder members for test tube attachment which are fitted individually in the guide grooves of the holder body so as to be movable vertically and radially and are configured to hold each of a plurality of types of test tubes having different outside diameters to be mounted in the cylindrical hollow portion; cam pins which are provided on opposite side portions of each said holder member and engage with the cam grooves so as to guide the holder member vertically and radially; and an urging spring which elastically urges each said holder member to be pushed up so that the holder member is pressed upward and toward the inner periphery of the cylindrical wall.