TRANSITION PIPE FITTING

• US 3,861,719 A
• Filed: 05/09/1973
• Issued: 01/21/1975
• Est. Priority Date: 05/09/1973
• Status: Expired due to Term

• Current Assignee: James D. Hand
• Original Assignee: James D. Hand
• Inventors: Hand, James D.
• Primary Examiner(s): Arola, Dave W.
• Application Number:
  US05/358,542
• Time in Patent Office: 622 Days
• Field of Search: 285/15,16,47,52,133R,138,331,40,50,44,51,53,54,354
• US Class Current: 285/47
• CPC Class Codes: F16L 47/005 the first pipe being joined to the ends of two other pipes placed one inside the other, e.g. gas pipe with protective sheath

Abstract

A pipe fitting for connecting concentric pipes together to a gas meter unit, includes a coupling nut with which the smaller of the pipes is sealingly engaged and a coupling sleeve securing the larger of the pipes to the nut, the larger pipe serving as a protective casing for the smaller one which serves as a gas conduit.

Claims

1. A pipe fitting for interconnecting concentric pipes together to a gas meter unit, comprising:

a coupling nut having an axial cylindrical bore therein;

a first non-metallic and flexible pipe of a given diameter serving as a gas conduit engaged at one end thereof with one end of said coupling nut;

the wall of said bore of said nut being axially aligned with the inner wall of said first pipe;

a stiffener sleeve element being in frictional engagement with said inner walls;

a portion of the diameter of said wall of said coupling nut bore at said one end thereof being equal to the outer diameter of said first pipe;

a sealing bushing surrounding said first pipe and being threadedly engaged with said coupling nut, and an elastic sealing ring disposed between said bushing and said first pipe to effect a sealing engagement thereat as said bushing is tightened;

a second metallic pipe of a diameter larger than that of said first pipe and encasing same as a protective casing over at least a portion of the length of said first pipe;

a coupling sleeve surrounding said engaged pipe and said coupling nut, said sleeve coupling together one end of said second pipe with said nut; and

insulation means disposed between said coupling sleeve and said nut for insulating said second pipe from any stray electric currents coming from the direction of the gas meter unit.

2. The pipe fitting according to claim 1, wherein a union nut surrounds said second pipe and is threadedly engaged with said sleeve, and another elastic sealing ring being disposed between said union nut and said second pipe to effect a sealing engagement thereat as said union nut is tightened.