초록 ▼

A coupling feature for double-walled pipes. A double-walled vent pipe section has an outer wall with corresponding male and female coupling features formed on opposite ends thereof. The inner wall of the double-walled pipe section has a small ridge formed around the circumference of one end. When pi

A coupling feature for double-walled pipes. A double-walled vent pipe section has an outer wall with corresponding male and female coupling features formed on opposite ends thereof. The inner wall of the double-walled pipe section has a small ridge formed around the circumference of one end. When pipe sections are coupled together, the male and female coupling features on the outer walls engage, and the ridge on the inner wall of one pipe section engages with the bare inner wall of the other pipe section.

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1. A double-walled vent pipe section, comprising: a first cylindrical structure having: a first outer wall,a first inner wall coaxially disposed within the first outer wall having an outer cylindrical surface defined by a diameter extending along the first inner wall a first length from an end of th

1. A double-walled vent pipe section, comprising: a first cylindrical structure having: a first outer wall,a first inner wall coaxially disposed within the first outer wall having an outer cylindrical surface defined by a diameter extending along the first inner wall a first length from an end of the first inner wall toward an opposing end of the first inner wall, andsaid first outer wall having a first coupling feature on a first end of the first cylindrical structure and a second coupling feature on a second end of the first cylindrical structure,a second cylindrical structure having: a second outer wall,a second inner wall coaxially disposed within the second outer wall, the second inner wall having an inner cylindrical surface having a diameter extending a second length from an end of the second inner wall toward an opposing end of the second inner wall, the diameter of the inner cylindrical surface allowing the first inner wall to be inserted into the second inner wall so that at least the first and second lengths substantially overlap, anda first annular region separating the first outer wall from the first inner wall, and a second annular region separating the second outer wall from the second inner wall;said second outer wall having a first coupling feature on a first end of the second cylindrical structure and a second coupling feature on a second end of the second cylindrical structure;said first coupling feature of the first cylindrical structure adapted to mate with the second coupling feature on the second end of the second cylindrical structure, and said first inner wall having an annular ridge formed therein at a spaced distance apart from said end of the first inner wall, the annular ridge having a height above the outer cylindrical surface and extending into the first annular region, wherein the first end of the first cylindrical structure including the annular ridge is inserted into the second cylindrical structure so that the outer cylindrical surface mates with the inner cylindrical surface along the first and second lengths and the annular ridge engages with the inner cylindrical surface at a spaced distance apart from the end of the second inner wall within the second length. 2. The double-walled vent pipe section of claim 1, wherein the annular ridge is disposed around a circumference of the first inner wall. 3. The double-walled vent pipe section of claim 1, wherein the height is defined by a first surface and a second surface meeting at an apex, and the first and second surfaces define a length. 4. The double-walled vent pipe section of claim 3, wherein the height is approximately one-sixty-fourth of an inch. 5. The double-walled vent pipe section of claim 3, wherein the length is approximately three-eighths of an inch. 6. The double-walled vent pipe section of claim 1 wherein the height of the annular ridge defines a diameter greater than the diameter of the outer cylindrical surface to create a seal between the first inner wall on the first end of the first cylindrical structure and the second inner wall on the second end of the second cylindrical structure when the first and second cylindrical structures are mated together. 7. A system for coupling vent pipe sections, comprising: a first cylindrical structure having an outer wall, an inner wall coaxially disposed within the outer wall, and an annular region separating the outer wall from the inner wall, said outer wall having a first coupling feature on a first end of the first cylindrical structure and a second coupling feature on a second end of the first cylindrical structure, and said inner wall having a first end having an outer cylindrical surface defined by a diameter along a length extending from the first end of the inner wall, the outer cylindrical surface having an annular ridge formed therein at a distance spaced apart from said first end within the length, the annular ridge extending into the annular region near the first end of the first cylindrical structure; anda second cylindrical structure having an outer wall, an inner wall coaxially disposed within the outer wall, and an annular region separating the outer wall from the inner wall, said outer wall having a first coupling feature on a first end of the second cylindrical structure and a second coupling feature on a second end of the second cylindrical structure, said inner wall of said second cylindrical structure having an inner cylindrical surface defined by a diameter greater than the diameter of the outer cylindrical surface along a length extending away from an edge of the inner wall, the inner wall receiving the first end of the inner wall of the first cylindrical structure along the length;wherein the second end of the second cylindrical structure mates with the first end of the first cylindrical structure such that the first coupling feature of the first cylindrical structure engages with the second coupling feature of the second cylindrical structure, and the first end of the first cylindrical structure including the annular ridge on the outer cylindrical surface of the inner wall of the first cylindrical structure is inserted into the second cylindrical structure so that the annular ridge engages with the inner cylindrical surface of the inner wall of the second cylindrical structure past the edge and within the length of the inner cylindrical surface to create a seal between the inner wall on the first cylindrical structure and the inner wall on the second cylindrical structure. 8. The system of claim 7, wherein the annular ridge has a height defined by a first surface and a second surface meeting at an apex, and the first and second surfaces define a length. 9. A double-walled vent pipe section, comprising: a first cylindrical structure having: an outer wall,a first inner wall coaxially disposed within the outer wall, the first inner wall having a first end defined by an edge, the first inner wall including an outer cylindrical surface defined by a first diameter extending a first length from the first end of the inner wall, andan annular region separating the outer wall from the first inner wall,said first inner wall having an annular ridge formed therein in the first length and apart from the edge of the first inner wall, the annular ridge extending into the annular region, wherein the first end of the inner wall of the first cylindrical structure including the annular ridge is inserted into a corresponding second cylindrical structure so that the annular ridge engages with a second inner wall of the second cylindrical structure, the second inner wall of the second cylindrical structure having an inner cylindrical surface having a second diameter extending a second length from an end of a second inner wall toward an opposing end of the second inner wall, the second diameter of the inner cylindrical surface greater than the first diameter to allow the first inner wall to be inserted into the second inner wall so that at least the first and second lengths substantially overlap, andwherein the annular ridge has a diameter greater than the first diameter to engage the inner cylindrical surface at a position within the second length spaced apart from the end of the second inner wall to create a seal between the first inner wall of the first cylindrical structure and the second inner wall of the second cylindrical structure when the first and second cylindrical structures are mated together. 10. A system for coupling double-walled vent pipe sections, comprising: a first cylindrical structure including a first inner wall having an outer cylindrical surface defined by a diameter extending along the first inner wall a first length from an end of the first inner wall toward an opposing end of the first inner wall, the outer cylindrical surface having an annular ridge formed therein extending from the outer cylindrical surface and formed near a first end thereof within the first length spaced apart from the end of the first inner wall; anda second cylindrical structure including a second inner wall, the second cylindrical structure including a first end and a second end, the second inner wall having an inner cylindrical surface having a diameter extending a second length from an end of the second inner wall toward an opposing end of the second inner wall, the diameter of the inner cylindrical surface being greater than the diameter of the outer cylindrical surface to allow the first inner wall to be inserted into the second inner wall so that at least the first and second lengths substantially overlap;wherein the second end of the second cylindrical structure mates with the first end of the first cylindrical structure, such that the first end of the first cylindrical structure including the annular ridge on the first inner wall of the first cylindrical structure is inserted into the second cylindrical structure so that the annular ridge engages with the inner cylindrical surface, the second length of the inner cylindrical surface and the first length of the outer cylindrical surface substantially overlapping, the annular ridge engaging the inner cylindrical surface within the second length of the inner cylindrical surface spaced apart from the end of the second inner wall at the second end of the second cylindrical structure to provide a seal between the first and second inner walls on the first and second cylindrical structures.