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Chromatographic column fittings

  • US 4,083,702 A
  • Filed: 07/19/1976
  • Issued: 04/11/1978
  • Est. Priority Date: 07/19/1976
  • Status: Expired due to Term
First Claim
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1. In a chromatograph having a chromatographic column tube and a connection tube, a fitting for interconnecting said tubes comprising:

  • a union member having an axial through-bore which includes at both ends thereof;

    a first portion,a second inwardly tapered portion connected to the first portion, anda third cylindrical portion connecting the second portion of one end of the union member with the second portion of the other end of the union member;

    one end of said connecting tube being receivable in one end of said union member and one end of said column tube being receivable in the other end of said union member, said one end of said connecting tube and said one end of said column tube being engageable in butt-to-butt relationship within said union member,means for wedging ferrule means between the outside surface of said connecting tube and the adjacent second portion of said union member to retain said connecting tube in said union member, and means for wedging second ferrule means between the outside surface of said column tube and the adjacent second portion of said union member to retain said column tube within said union member, the adjacent ends of the two ferrule means being disposed in essentially ferrule-to-ferrule orientation with respect to each other within said union member, and the two ferrule means extending substantially to the ends of the tubes respectively.

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