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US 5,228,479 AGranted
Multi-layered flexible piping and method and machine for forming same
AssigneeTru-Flex Metal Hose Corporation
InventorRoy W. Thomas
Life of this patent
Estimating the term…
Abstract
Flexible piping includes a first, spiral-wound band forming an inner winding and a second, spiral-wound band forming an outer winding in covering relationship over the inner winding. Inner and outer spiral-wound bands of insulating material are wound between the inner and outer windings and over the outer winding respectively. An insulating sleeve receives the spiral-wound inner and outer windings and the inner and outer insulating material bands. A method and a machine for forming the flexible piping are also disclosed.
Claims13
Flexible metal piping, which includes:
- (a) a first, inner spiral winding comprising a metallic band with leading and trailing edges;
- (b) a second, outer spiral winding comprising a metallic band with leading and trailing edges, said outer winding overlying said inner winding, said leading edge of said inner metallic band being folded together with said leading edge of said outer metallic band, said trailing edge of said inner metallic band being folded together with said trailing edge of said outer metallic band, and said folded leading edges of said inner and outer metallic bands being interlocked with said folded trailing edges of said inner and outer metallic bands;
- and
- (c) a band of sealing material with leading and trailing edges, said sealing material band being spiral-wound in overlying relation with respect to at least one of said windings with said sealing material band leading and trailing edges engaged in sealing relation.
1 more element
Flexible metal piping, which includes:
- (a) a first, inner spiral winding comprising a metallic band with leading and trailing edges and a plurality of convolutions extending in generally parallel relation with respect to said first winding edges;
- (b) a second, outer spiral winding comprising a metallic band with leading and trailing edges, said outer winding overlying said inner winding and including multiple convolutions extending in generally parallel relation with respect to said second winding edges, said leading edge of said inner metallic band being folded together with said leading edge of said outer metallic band, said trailing edge of said inner metallic band being folded together with said trailing edge of said outer metallic band, and said folded leading edges of said inner and outer metallic bands being interlocked with said folded trailing edges of said inner and outer metallic bands;
- (c) spiral seam means for interconnecting aid interlocked edges of said first and second windings;
- and
- (d) a band of sealing material with leading and trailing edges, said sealing material band being spiral wound in overlying relation with respect to at least one of said windings with said sealing material band leading and trailing edges engaged in sealing relation.
2 more elements
Dependencies are inferred from the claim text.