Column clamping device for chromatography

Claim 1

In a device for rapidly changing columns of the type generally used in liquid phase chromatography, said device comprising connectors for each end of a column with respective inlet and outlet for passage into and out of the column of the mobile phase, and the connectors being adapted so that there is no dead volume between column and connector, when connected thereon, due to the combined action of sealing means employed therewith, the improvement wherein said connectors comprise: upper and lower clamping and sealing elements (3 and 5) having sealing members (11, 20, 23 and 28) extending therefrom and said sealing member shaped to be compatible with the ends of the column to which they are to be sealed against at the inlet and outlets of the column, with said sealing elements having means for passing the liquid phase therethrough, and at least one of said upper and lower clamping and sealing elements (3 and 5) being movable in the axial direction of the column for clamping and unclamping the column; and pressure means for moving at least one of said upper and lower clamping and sealing elements (3 and 5) selectively between an unclamped position and a clamped position at which said pressure means is adapted for exerting a predetermined pressure on the column (2) to ensure substantially complete sealing, and wherein said pressure means comprises a pneumatic cylinder associated with means for moving said at least one of the upper clamping and sealing elements.