Abstract: The invention discloses a device for closing the inlet of a containment well of a blood centrifugation cell in the body of a centrifugation machine. A plate is supported at one end of the inlet of the containment well and is rotatable about the horizontal axis. The plate has a pair of parallel pins extending perpendicularly from the surface. A pair of half-lids are each pivotably supported at one end thereof by one of the pins, and have matable inner edges. The closing device includes apparatus for locking the half-lids into a closure position, whereby the half-lids are rotated downwardly against the inlet with the half-lids pivoted together, thereby closing the inlet of the containment well.

Abstract: The invention provides a device for locking the base of a blood centrifugation cell on a rotatable generally disc shaped chuck plate. The chuck plate encloses a plurality of elastic locators which extend radially a slight distance from the periphery of the plate. The plate further encloses a plurality of locking means which are biased to remain within the dimensions of the plate at rest and which are radially extendable by centrifugal force to extend beyond the periphery of the plate. An annular locking ring engages the base of the cell and extends around the periphery of the chuck plate. The locking ring has a plurality of internal recesses for initially receiving the elastic locators, and the locking means during centrifugation to secure the cell to the chuck plate.