US 5,806,567 A · Heat insulated hose

Abstract

A heat insulated hose includes an approximately cylindrical inner layer having a helical cavity portion formed by unbonded overlapping of a part of a polyvinyl chloride band material, helical reinforcing wire of hard resin incorporated inside the cavity portion, a heat insulating layer made of a foam resin band which is helically wound around the cavity portion at the same pitch as the cavity portion, and an outer layer made from a soft polyvinyl chloride band covering an outer periphery of the heat insulating layer. The reinforced wire is a double layer wire including a core wire of polyolefin resin and a cover layer of soft polyvinyl chloride covering an outer periphery of the core wire, and the cover layer is made to adhere to an inner wall portion of the cavity portion with use of an adhesive agent or by thermal fusing.

Claims15

Dependent claims

An insulated hose, comprising:

an approximately cylindrical inner layer comprising a first polyvinyl chloride band material having a helical cavity portion defined by an unbonded overlapping portion of said polyvinyl chloride band material, said helical cavity portion having an inner wall;
a helical reinforcing wire comprising a hard resin material positioned in said cavity portion;
a heat insulating layer comprising a foam resin band helically wound around said cavity portion at a same pitch as that of said cavity portion;
and
an outer layer comprising a second polyvinyl chloride band material covering an outer periphery of said heat insulating layer,
wherein said reinforcing wire comprises a double-layer wire including a core wire of polyolefin resin and a cover layer of polyvinyl chloride covering said core wire, said cover layer being adhered to said inner wall of said helical cavity portion with an adhesive agent or by heat fusing.

3 more elements

Dependencies are inferred from the claim text.

Heat insulated hose

Life of this patent

Heat insulated hose

Life of this patent

Abstract

Claims15