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Multi-size injector port system

  • US 4,792,396 A
  • Filed: 11/03/1987
  • Issued: 12/20/1988
  • Est. Priority Date: 11/03/1987
  • Status: Expired due to Term
First Claim
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1. Apparatus for use with a liquid chromatographic analyzing system for coupling not only to a tube of standard-size 1/16th inch outside diameter for usual operation with average to large samples but also to a smaller diameter tube of predetermined smaller outside diameter for operation with small samples with minimum dispersion of the sample, where the outside diameter of the standard-size tube is at least 50% greater than the outside diameter of the smaller diameter tube, comprising:

  • a frame having a tube coupling hole with an inner end portion which is cylindrical and of a diameter substantially equal to said smaller tube diameter to closely receive and surround an end of said smaller tube, said coupling hole having a larger diameter middle hole portion which can receive and closely surround the end of said standard-size tube with said middle hole portion including a tapered hole region, and said coupling hole having a threaded outer hole portion;

    first and second ferrules, each having a tapered forward outside surface which can seal to said tapered hole region, and an inside surface with a cylindrical shape inside that closely receives a different one of said tubes; and

    a screw that has an outer portion that can threadably couple to said threaded outer hole portion and an abutting portion that can abut one of said ferrules to press it forwardly.

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