Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Standard 2.5 mm sample tubes can be used in a nuclear magnetic resonance spinner turbine instead of expensive necked down 5.0 mm sample tubes. The spinner turbine 10 (Fig. 1) is modified by machining the cone 15 on the bottom of the turbine. A groove 16 is machined near the bottom of the cone for holding a small flexible O-ring 17 which is inserted into the groove 16 after circumferentially spaced slots 20 are longitudinally cut from cone 15. Slots 20 create flexible vanes or fingers for providing low pressure contact points to grip the 2.5 mm sample tube when the O-ring is in place.