Heraeus-christ Gmbh

Gerhard Schroter

Jurgen Baumler

To provide a vacuum-tight seal to the rotor of a gradient zone separation rotor, the rotor shaft (15) is formed with a circumferential groove (7) which can receive balls (6) located in radial grooves of a cover cap (2), and movable to engage positions with the circumferential groove (7) by an outer holding sleeve (3), or releasable engagement by pulling up on the sleeve (3) against spring pressure.

Centrifuge rotor closure

To provide for resilient hanging and outwardly swinging support of sample holder cups to be placed on the rotor of a centrifuge, a ring-shaped element is located axially offset from the holding portion for the cups of the rotor, the ring-shaped element having axially extending bores formed therein into which rod or strip spring elements are inserted, extending essentially axially along the rotor axis and then being bent over laterally outwardly and terminating in an L or P-shaped hook end so that the sample holder cups can be hooked therein for outward swinging movement. Preferably, the rotor and the sample holder cups are formed with interengaging abutments to limit outward movement of the cups during operation. The rotor itself is preferably formed with a groove to receive the horizontally extending portion of the spring elements. Additional restraining means can be provided to restrain undue deflection of the spring elements during rotor operation.

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Osterode, Germany

Gerhard Schroter