A ventilation chimney or exhaust fan flue section for hog barns has inner and outer plastic tubes formed by edge welding plastic sheets. An snug fitting insulation sheet is slid between the tubes. Collars of male and female coupling elements are inserted into the ends of the section between the inner and outer tubes and secured by screws passing through the outer tube and into the collars. The chimney can be installed by combining sections using a suitable adhesive.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows a cross sectional elevational view of a ventilation chimney section of the invention.
FIG. 2 shows a cross sectional plan view of the embodiment of claim 1.
Claims
1. A method of manufacture of a ventilation chimney section comprising welding plastic sheets to form inner and outer cylindrical tubes placing said inner tube within said outer tube and sliding a sheet of insulation between said inner and outer tube.
2. Method of claim 1 where said sheet of insulation is cut into a plurality of segments, alignable parallel to the common axis of said tubes, before sliding said sheet between said inner and outer tubes.
3. Method of claim 2 where said sheet of insulation is cut into four quarter cylindrical segments, alignable parallel to the common axis of said tubes.
4. Method of claim 1 where said sheet fits snugly between said inner and outer tubes.
5. Method of claim 4 where said sheet of insulation is cut into a plurality of segments, alignable parallel to the common axis of said tubes, before sliding said sheet between said inner and outer tubes.
6. Method of claim 5 where said sheet of insulation is cut into four quarter cylindrical segments, alignable parallel to the common axis of said tubes.
7. Method of claim 1 where the collar of a male coupling element is inserted into one end of said section between said inner and outer tubes and secured therein, and the collar of a female coupling element is inserted into the other end of said section between said inner and outer tubes and secured therein, said male coupling element being adapted to matingly engage a female coupling identical to said female coupling element and vice versa.
8. Method of claim 7, where said collars are secured between said inner and outer tubes by fasteners.
9. Method of claim 8, wherein said fasteners are screws extending through said outer tube and into said collars.
10. Chimney ventilation section comprising coaxial inner and outer plastic tubes separated by a sheet of insulation in the space between said inner and outer tubes.
11. Section of claim 10 wherein said sheet of insulation fits snugly between said inner and outer tubes.
12. Section of claim 11 wherein said sheet of insulation has four quarter cylindrical segments aligned parallel to the common axis of said tubes.
13. Section of claim 10 where the collar of a male coupling element is inserted into one end of said section between said inner and outer tubes and secured therein, and the collar of a female coupling element is inserted into the other end of said section between said inner and outer tubes and secured therein, said male coupling element being adapted to matingly engage a female coupling identical to said female coupling element and vice versa.
14. Section of claim 13, where said collars are secured between said inner and outer tubes by fasteners.
15. Section of claim 14, wherein said fasteners are screws extending through said outer tube and into said collars.
16. Section of claim 14, wherein said male coupling element has a first circumferential wall abutting the collar of said male coupling element projecting outward, a first inner cylindrical sleeve at the inner edge of said first circumferential wall said first sleeve forming a plug to engage a socket of a female coupling element.
17. Section of claim 14 wherein said female coupling element has a second circumferential wall abutting said collar projecting outward, and a second outer cylindrical sleeve at the outer edge of said circumferential wail, said second sleeve and said second wall forming a socket to engage a plug of a male coupling element.
Patent Application
20070228733
