Knit tubular protective sleeve and method of construction thereof

1. A knit sleeve for providing thermal protection about an elongate member, comprising:

a knit inner wall with opposite edges extending lengthwise between opposite ends;

a seamless, circumferentially continuous, tubular outer wall knit integrally to said inner wall, said circumferentially continuous, tubular outer wall bounding a central cavity that extends lengthwise along a longitudinal central axis between open opposite ends of said seamless, circumferentially continuous, tubular outer wall;

said opposite edges of said inner wall being wrapped toward one another to form the inner wall as being a wrapped inner wall; and

said seamless, circumferentially continuous, tubular outer wall being everted about said wrapped inner wall to circumferentially envelop at least a portion of said wrapped inner wall such that said wrapped inner wall is at least partially disposed in said central cavity, with said opposite edges of said inner wall extending generally parallel to said longitudinal central axis.

2. The knit sleeve of claim 1 , wherein said opposite ends of said seamless, circumferentially continuous, tubular outer wall and said wrapped inner wall are substantially flush with one another upon disposing said wrapped inner wall in said central cavity.

3. The knit sleeve of claim 1 , wherein the yarn forming said outer wall has greater impact resistance relative to the yarn forming said inner wall.

4. The knit sleeve of claim 3 , wherein the yarn forming said outer wall comprises one or more material of the group consisting of at least one of polyester, nylon, polypropylene, polyethylene, acrylic, cotton, rayon.

5. The knit sleeve of claim 4 , wherein the yarn forming said inner wall is a multifilament mineral fiber.

6. The knit sleeve of claim 5 , wherein the yarn forming said inner wall comprises one or more material of the group consisting of at least one of silica, fiberglass, ceramic, basalt, slate, slag, aramid and carbon.

7. The knit sleeve of claim 1 , wherein the yarn forming said outer wall is coated with an impact resistant material.

8. The knit sleeve of claim 7 , wherein the impact resistant material coating the yarn of said outer wall is made of silicone or polytetrafluoroethylene.

9. The knit sleeve of claim 1 , wherein the yarn forming said inner wall has greater heat-resistance relative to the yarn forming said outer wall.

10. The knit sleeve of claim 9 , wherein the yarn forming said inner wall is a multifilament mineral fiber.

11. The knit sleeve of claim 9 , wherein the yarn forming said inner wall comprises one or more material of the group consisting of at least one of silica, fiberglass, ceramic, basalt, slate, slag, aramid and carbon.

12. A method of constructing a tubular textile sleeve for providing a thermal barrier about an elongate member extending therethrough, comprising:

knitting a single layer inner wall having opposite edges extending lengthwise between opposite ends; and

knitting a seamless, circumferentially continuous, tubular outer wall having a central cavity extending lengthwise along a central axis between open opposite ends integrally with the inner wall such that the inner wall extends away from the outer wall, wherein the inner wall is wrappable to form the inner wall into a tubular wall and wherein the outer wall is everted about the inner wall to form the sleeve having a dual layer wall, with said opposite edges of said inner wall extending generally parallel to said longitudinal central axis.

13. The method of claim 12 , further including wrapping the inner wall to form the inner wall into a tubular wall and everting the seamless, circumferentially continuous, tubular outer wall about the wrapped tubular inner wall to circumferentially surround the tubular inner wall.

14. The method of claim 12 , further including integrally knitting one of the opposite edges of the inner wall to the outer wall.

15. The method of claim 12 , further including integrally knitting the outer wall to extend lengthwise between the opposite ends of the inner wall and to extend between the opposite edges of the inner wall with the central axis extending in generally parallel relation with the opposite edges.

16. The method of claim 12 , further including forming the outer wall with yarn having a greater impact resistance relative to the yarn forming the inner wall.

17. The method of claim 16 , further including forming the outer wall comprising one or more material of the group consisting of polyester yarn, nylon yarn, polypropylene yarn, polyethylene yarn, acrylic yarn, cotton yarn, and rayon yarn.

18. The method of claim 12 , further coating the yarn of the outer wall with an impact resistant material.

19. The method of claim 18 , further including providing the impact resistant material coating the yarn of the outer wall being made of silicone or polytetrafluoroethylene.

20. The method of claim 12 , further including forming the inner wall with a heat resistant mineral yarn, such as from fiberglass, silica, basalt, ceramic, slate, slag, or the like, and forming the outer wall from a different yarn having an increased impact resistance relative to the yarn forming the inner wall.

21. The method of claim 12 , further including knitting the inner wall with a first type of yarn and knitting the outer wall with a second type of yarn different from the first type of yarn, wherein the first type of yarn has an increased thermal insulating property relative to the second type of yarn and the second type of yarn has an increased toughness relative to the first type of yarn.