Patent ID: 6216742
Filing Date: 2001-04-17
Classification: B60H,F16L

Abstract:
A heat insulating hose comprising:a seamless cylindrical inner tube formed of a synthetic resin; anda cylindrical heat insulating layer formed of a foamed synthetic resin for covering an outer peripheral face of the inner tube,wherein said inner tube is provided at its one end in an axial direction thereof with a cylindrical part for connection with a drain outlet of an air conditioning appliance and is formed with a number of ring-shaped protrusion stripes which project toward its outer circumference over an entire length thereof in the axial direction except said cylindrical part, said ring-shaped protrusion stripes adjacent said cylindrical part being spaced at a first predetermined distance W which is wider than an axial width w of each of said ring-shaped protrusion stripes, andwherein said inner tube has an area b of a desired range spaced by a determined length a from said cylindrical part, said area being an area where a part of said ring-shaped protrusion stripes are formed to arrange adjacent ring-shaped protrusion stripes at a second predetermined distance s smaller than said first predetermined distance W,wherein said ring-shaped protrusion stripes adjacent said cylindrical part comprise a first continuous pattern and said ring-shaped protrusion stripes of said area b comprise a second continuous pattern.