Connecting device for connecting chromatographic separating colu

Details Connecting device for connecting chromatographic separating colu Connecting device for connecting chromatographic separating colu

1975-11-03

1976-08-10

Shedd, Wayne L.

Pipe joints or couplings

Packed

Wedge

285356, F16L 1700, F16L 1906, F16L 1908, F16L 2102

Patent

active

039737926

ABSTRACT:
In a connecting device for connecting chromatographic separating columns of glass to terminal fittings on a chromatographic apparatus, each end of the column is surrounded by a metallic sleeve. A sleeve made of synthetic plastic material, which is of substantially stable shape at least up to a temperature of 350.degree. centigrade even if subjected to pressure, is interposed between said end and said metallic sleeve. A preferred material is polyimide. The plastic sleeve has at least one conical end face and is held in sealing engagement with the end of the separating column, on one hand, and with the metallic sleeve, on the other hand, by a sleeve shaped thrust member, which is axially movable relative to the metallic sleeve to exert an axial force on said plastic sleeve. A radial sealing force is exerted on the snthetic plastic sleeve through its conical end face by an abutting complementary conical surface. Conventional connecting means for gas-tightly and detachably connecting the ends of the column to the terminal fittings of the apparatus are provided on the metallic sleeve. In another embodiment the plastic sleeve is made of polytetrafluoroethylene, and the sleeve is held in sealing engagement with the metallic sleeve and the end of the separating column at an adjustable minimum axial pressure. This pressure is exerted through a sleeve-shaped thrust member by a compressed spring.

REFERENCES:
patent: 2190419 (1940-02-01), Evarts
patent: 2308757 (1943-01-01), Hulsberg
patent: 3362731 (1968-01-01), Gasche et al.
patent: 3756632 (1973-09-01), Riggs et al.

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