Patent ID: 6076862
Filing Date: 2000-06-20
Classification: F16L,F23J

Abstract:
Concentric duct apparatus, comprising:an outer duct extending along a first axis;stand-off apparatus anchored within said outer duct and circumscribing said first axis;an inner duct extending along a second axis and being laterally smaller than said outer duct; andfirst and second axially spaced exterior projections disposed on and extending laterally around said inner duct,said inner duct being coaxially insertable into said outer duct to a predetermined operative position therein,said stand-off apparatus and said exterior projections being cooperable, in response to coaxial insertion of said inner duct into said outer duct, to provide a snap-fitted relationship between said inner and outer ducts, in which said inner duct is nonreleasably locked against removal in either axial direction from said outer duct, when said inner duct reaches said operative position thereof.