Method and device for extracting filter frits from liquid chroma

Details Method and device for extracting filter frits from liquid chroma Method and device for extracting filter frits from liquid chroma

1975-06-18

1976-09-07

Lanham, C.W.

Metal working

Method of mechanical manufacture

Shaping mating parts for reassembly in different positions

29200D, 29234, 29256, 29270, B23P 1902

Patent

active

039785750

ABSTRACT:
A method and apparatus for removing a small metal filter from a liquid chromatographic column, wherein a retaining member is clamped around the tube. A first centering device is releasably centered on the retaining member in alignment with the filter, whereupon a drill is slidably guided through the centering device for forming a hole of selected depth in the filter. The first centering device is removed and a second centering device is supported on the retainer, which second centering device has a threaded opening therethrough aligned with the filter. An extractor is threaded into the opening so that the end of the extractor is disposed directly adjacent the filter. A tapping unit having an elongated thread-forming tap is slidably inserted through an opening formed in the extractor, which opening is aligned with the hole formed in the filter. The tapping unit is threaded inwardly so that the tap threadably engages the filter and until a handle on the tapping unit abuts the extractor. The second centering device and the tapping unit are then held in a nonrotatable condition, and the extractor is reversely rotated so as to thread same out of the second centering device, whereby the tapping unit is axially displaced outwardly away from the second centering unit so that a pulling force is imposed on the filter to remove same from the end of the column.

REFERENCES:
patent: 2670639 (1954-03-01), Flowers et al.
patent: 3120700 (1964-02-01), Chuplis
patent: 3740814 (1973-06-01), Marshall

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