Patent ID: 8414466

Claim:
A lid-section mechanism for rotors that covers a surface of a rotor of a centrifuge, the surface leading to a sample insertion section, the centrifuge comprising a rotating shaft, a rotating head secured to one end of the rotating shaft, and the rotor that has the sample insertion section storing a sample and is attached to the rotating head, the lid-section mechanism for rotors comprising: a lid covering the surface of the rotor that leads to the sample insertion section; a knob turned to attach or detach the lid; a knob shaft that is a cylindrical component secured to or formed integrally with the knob so as to have the same center as the knob, the knob shaft extending through the lid and having a thread part at a tip thereof; a circular plate that is placed on the surface of the lid facing the knob, the circular plate having a plurality of click holes formed on a circle centered at the shaft center of the rotating shaft and having a shaft hole through which the knob shaft extends; a plate spring that is attached to a surface of the knob facing the circular plate and, if the distance between the knob and the lid is equal to or less than a predetermined value, is caught in one of the plurality the click holes; and an elastic body that is placed between the knob and the lid and pushes the lid depending on the distance between the knob and the lid; wherein turning the knob when the distance between the knob and the lid is equal to or less than the predetermined value repeats a cycle in which the plate spring is caught in the one of the plurality of click holes and then the plate spring is bent and removed from the one of the plurality of click holes.