Patent ID: 7108651

Claim:
A centrifuge for selectively mounting and rotating a rotor among a plurality of rotors each having a kind or a size different from each other, comprising: a frame body; a power generator supported by the frame body and having an output shaft which generates rotation torque, the power generator having an end portion supporting the output shaft via a bearing; a rotation drive shaft rotatable upon rotation of the output shaft and having a first flexural rigidity; a support shaft positioned in the vicinity of the rotation drive shaft and having a second flexural rigidity which is higher than the first flexural rigidity; and the rotation drive shaft and the support shaft providing a relationship arranged to allow a selected one of the rotors to be selectively set only on the rotation drive shaft, or only on the support shaft or on both the rotation drive shaft and the support shaft dependent on the selected rotor, whereby one of the first flexural rigidity, the second flexural rigidity, and a composite flexural rigidity between the first and second flexural rigidities is exhibited dependent on the selected rotor.