Chromatographic column
AssigneeLabomatic AG
InventorKlaus Kronwald
Life of this patent
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Abstract
The present invention relates to a chromtographic column having a tube, preferably made of glass, with sealed-off connection pieces, preferably with frets, the tube having at each end flanges, which together with a screw joint, connect the connection pieces to the tube. The connection pieces have a central tube which possesses a clamping ring above the fret recess at its end. The clamping ring is preferably of conical design and the tube is surrounded by a sleeve which acts on the clamping ring through a counterpiece, preferably an oppositely sloped cone. Arranged between the clamping surfaces is a squeezable seal. The sleeve is supported by the screw joint and the tube has a thread passing through the screw joint and can be fixed by a nut on the upper part of the screw joint.
Claims16
A chromatographic column, comprising:
- a column made of transparent material having an end and an inner surface;
- a tube having an upper and lower part, the lower part having a frit recess for communicating with the interior of the column and having a clamping ring comprising a surface generally facing in one axial direction;
- a sleeve surrounding the tube, the sleeve having a counterpiece comprising a surface generally facing in the opposite axial direction;
- means for supporting the sleeve on the end of the column;
- means for axially moving the tube relative to the sleeve;
- and
- a squeezable seal disposed around the tube and contacting the clamping ring of the tube and the counterpiece of the sleeve, the seal being adapted to move radially outwardly when the tube is moved relative to the sleeve and the seal is squeezed between the clamping ring and the counterpiece, the seal sealingly engaging the inner surface of the column as it moves radially outwardly;
- wherein the lower part of said sleeve extends below said sleeve support means to an extent sufficient to permit visual inspection of said seal.
Dependencies are inferred from the claim text.