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US3872780A
Expired / Lapsed
US
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Triple wall chimney pipe assembly
Assignee: American Metal Products Co
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Filing: 1974-04-03
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Granted: 1975-03-25
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Expires: 1994-04-03
Abstract
Abstract A prefabricated pipe assembly for use in forming a chimney is made up of outer, intermediate, and inner pipe sections which define spaced apart walls. Groups of projections are formed on the inner periphery of the outer section for maintaining the intermediate section concentrically positioned therein. Spacer ring structure is mounted within the ends of the outer section to hold the intermediate section longitudinally therein and concentrically position the inner section. Cooperating structure is formed on the inner section and spacer rings to hold the inner section longitudinally in place. Interlocking male and female structure is formed on opposite ends of the pipe assembly for joining one with another.
Inventors
- 👤 Theodore Zanias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:34
CPC Classifications
E; E04; E04H; E04H12/00; E04H12/28; F; F23; F23J; F23J13/00; F23J13/02; F23J13/025; F23J13/04; F23J2213/00; F23J2213/20; F23J2213/202
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
268 words
A pipe assembly for forming a chimney, comprising: substantially cylindrical outer, intermediate and inner pipe sections, and pipe sections being positioned concentrically one within the other and dimensioned to define spaced apart walls; a group of projections formed on the inner peripheral surface of said outer pipe section adjacent each end thereof for maintaining said intermediate pipe section concentrically positioned within said outer pipe section, the length of said intermediate pipe section being less than the length of said outer pipe section but at least as long as the longitudinal distance between said groups of projections; first and second spacer rings, each of said spacer rings having an outer diameter a predetermined amount smaller than the inner diameter of said intermediate pipe section and an inner diameter larger than the outer diameter of said inner pipe section; support structure secured between said outer pipe section and said spacer rings mounting said first and second spacer rings concentrically within said outer pipe section at opposite ends thereof, said support structure positioned to hold the ends of said intermediate pipe section longitudinally within the ends of said outer pipe section in a longitudinal position in which portions of the outer periphery surface of said intermediate pipe section are positioned within each of said groups of projections and hence are held concentrically positioned thereby; and cooperating structure means formed on said spacer rings and inner pipe section for supporting said inner pipe section within said intermediate pipe section, said structure means being operable to hold said inner pipe section in a substantially fixed longitudinal position concentric with said outer pipe section.
Claim 2
Dependent Claim
268 words
A pipe assembly for forming a chimney, comprising: substantially cylindrical outer, intermediate and inner pipe sections, and pipe sections being positioned concentrically one within the other and dimensioned to define spaced apart walls; a group of projections formed on the inner peripheral surface of said outer pipe section adjacent each end thereof for maintaining said intermediate pipe section concentrically positioned within said outer pipe section, the length of said intermediate pipe section being less than the length of said outer pipe section but at least as long as the longitudinal distance between said groups of projections; first and second spacer rings, each of said spacer rings having an outer diameter a predetermined amount smaller than the inner diameter of said intermediate pipe section and an inner diameter larger than the outer diameter of said inner pipe section; support structure secured between said outer pipe section and said spacer rings mounting said first and second spacer rings concentrically within said outer pipe section at opposite ends thereof, said support structure positioned to hold the ends of said intermediate pipe section longitudinally within the ends of said outer pipe section in a longitudinal position in which portions of the outer periphery surface of said intermediate pipe section are positioned within each of said groups of projections and hence are held concentrically positioned thereby; and cooperating structure means formed on said spacer rings and inner pipe section for supporting said inner pipe section within said intermediate pipe section, said structure means being operable to hold said inner pipe section in a substantially fixed longitudinal position concentric with said outer pipe section.
Claim 3
Dependent Claim
31 words
The invention defined in claim 1 wherein each of said groups of projections are formed by making circumferentially spaced apart indentations in the outer peripheral surface of said outer pipe section.
Claim 4
Dependent Claim
33 words
The invention defined in claim 1 wherein each of said groups of projections is comprised of more than two projections, the projections in each of said groups being spaced apart circumferentially substantially equally.
Claim 5
Dependent Claim
29 words
The invention defined in claim 3 wherein said projections in each of said groups define a common plane substantially perpendicular to the longitudinal axis of said outer pipe section.
Claim 6
Dependent Claim
47 words
The invention defined in claim 1 wherein said support structure comprises extensions formed as an integral part of said spacer rings, said extensions corresponding in number to said projections and each being rigidly secured to said outer pipe section in radial alignment with one of said projections.
Claim 7
Dependent Claim
61 words
The invention defined in claim 5 wherein each of said spacer rings and said extensions formed integral therewith are planar and define a common plane, said extensions being secured to said outer pipe section to extend substantially perpendicular to the axis thereof whereby said spacer rings are positioned in a plane substantially perpendicular to the axis of said outer pipe section.
Claim 8
Dependent Claim
191 words
The invention defined in claim 1, wherein said structure means for supporting said inner pipe section within said intermediate pipe section comprises: an inwardly extending annular flange portion formed on said first spacer ring, said annular flange portion being concentrically positioned with respect to said outer pipe section; an outward annular flare formed on the end of said inner pipe section adjacent said first spacer ring, said outward flare being dimensioned to mate with said annular flange portion by fitting thereover; and an annular projection formed around the outer periphery of said inner pipe section adjacent its other end but a spaced distance therefrom, said annular projection being longitudinally positioned to rest against the inside surface of said second spacer ring whenever the flared end of said inner pipe section is fitted around the inwardly extending annular flange portion of said first spacer ring, the end portion of said inner pipe section extending outwardly from said annular projection formed therearound being for insertion into the annular flange portion of the first spacer ring of a second of said pipe assemblies at the time of assembling two of said pipe assemblies together.
Claim 9
Dependent Claim
32 words
The invention defined in claim 7 wherein said outer pipe section has formed on its opposite ends interlocking male and female structure means for joining one of said pipe assemblies with another.
Claim 10
Dependent Claim
174 words
The invention defined in claim 8, wherein: said support structure comprises extensions formed as an integral part of said spacer rings, said extensions corresponding in number to said projections and each being rigidly secured to said outer pipe section in radial alignment with one of said projections; each of said spacer rings and said extensions formed integral therewith are planar and define a common plane, said extensions being secured to said outer pipe section to extend substantially perpendicular to the axis thereof whereby said spacer rings are positioned in a plane substantially perpendicular to the axis of said outer pipe section; and each of said groups of projections are formed by making circumferentially spaced apart indentations in the outer peripheral surface of said outer pipe section, each of said groups of projections being comprised of more than two projections, the projections in each of said groups being spaced apart circumferentially substantially equally, said projections in each of said groups defining a common plane substantially perpendicular to the longitudinal axis of said outer pipe section.
Claim 11
Dependent Claim
32 words
The invention defined in claim 1 wherein said outer pipe section has supporting on its opposite ends interlocking male and female structure means for joining one of said pipe assemblies with another.
Claim 12
Dependent Claim
51 words
The invention defined in claim 1 wherein said pipe sections, said projections, said spacer rings, said support structure means and said cooperating structure means are dimensioned with respect to each other to accommodate a limited amount of relative movement due to settling, thermal expansion and contraction, or the like, without damage.
Claim 13
Dependent Claim
226 words
In a prefabricated pipe assembly for use in forming a chimney having outer, intermediate, and inner pipe sections defining spaced apart walls, the improvement in combination therewith of: first and second longitudinally spaced apart groups of projection means formed on the inner periphery of said outer pipe section for maintaining said intermediate pipe section concentrically positioned therein; a pair of spAcer rings each having an outer diameter a predetermined amount smaller than the inner diameter of said intermediate pipe section and an inner diameter larger than the outer diameter of said inner pipe section; support structure secured between said outer pipe section and said spacer rings mounting said first and second spacer rings concentrically within said outer pipe section at opposite ends thereof, said support structure positioned to hold the ends of said intermediate pipe section longitudinally within the ends of said outer pipe section in a longitudinal position in which portions of the outer peripheral surface of said intermediate pipe section are positioned within each of said groups of projection means and hence are held concentrically positioned thereby; and cooperating structure means formed on said spacer rings and inner pipe section for supportin said inner pipe section within said intermediate pipe section, said structure means being operable to hold said inner pipe section in a substantially fixed longitudinal position concentric with said outer pipe section.
Claim 14
Dependent Claim
226 words
In a prefabricated pipe assembly for use in forming a chimney having outer, intermediate, and inner pipe sections defining spaced apart walls, the improvement in combination therewith of: first and second longitudinally spaced apart groups of projection means formed on the inner periphery of said outer pipe section for maintaining said intermediate pipe section concentrically positioned therein; a pair of spAcer rings each having an outer diameter a predetermined amount smaller than the inner diameter of said intermediate pipe section and an inner diameter larger than the outer diameter of said inner pipe section; support structure secured between said outer pipe section and said spacer rings mounting said first and second spacer rings concentrically within said outer pipe section at opposite ends thereof, said support structure positioned to hold the ends of said intermediate pipe section longitudinally within the ends of said outer pipe section in a longitudinal position in which portions of the outer peripheral surface of said intermediate pipe section are positioned within each of said groups of projection means and hence are held concentrically positioned thereby; and cooperating structure means formed on said spacer rings and inner pipe section for supportin said inner pipe section within said intermediate pipe section, said structure means being operable to hold said inner pipe section in a substantially fixed longitudinal position concentric with said outer pipe section.
Claim 15
Dependent Claim
31 words
The invention defined in claim 12 wherein male and female interlocking structure means are formed on opposite ends of said pipe assembly for joining one of said pipe assemblies with another.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |