Thermal shield

Claim 2

A thermal shield surrounding a fixture running through a hole in a wall, said thermal shield comprising a pair of rigid mating insulators forming a cylinder closely surrounding said fixture, a pair of metal shields encasing said insulators, the first of said shields partially circumscribing the external surface of said mating insulators, said first of said shields provided with longitudinal edge portions, and the second of said shields circumscribing both the external surface of said insulators not circumscribed by the first of said shields and the longitudinal edge portions of said first shield so that said first shield is captured by said second shield and the pair of said shields in combination extend completely around and closely surround the external surface of said insulators holding them in mating relation, said shields being placed into captured relation by sliding the second of said shields onto the longitudinal edge portions of the first of said shields in a direction generally parallel to the fixture, a pair of asbestos ropes surrounding said shields in sealing relation at opposite ends thereof, said ropes being coated with a protective material to prevent the asbestOs from flaking and crumbling, and a pair of elongated flanged tubular members disposed in the hole in the wall through which the fixture passes, said tubular members surrounding said fixture, said shields, and said insulators, the flanges of said tubular members being attached to opposite sides of the wall respectively, and said tubular members sealingly and slidingly engaging with the respective ropes disposed around the opposite ends of said shields.

Claim 3

The thermal shield according to claim 1 wherein said metal shields are sectioned to form two separate pair of shields spaced apart to form a gap therebetween, each of said pair of shields closely surrounding said insulators at opposite ends thereof.

Claim 4

The thermal shield according to claim 2 wherein said gap is covered by thermally vapor barrier tape to provide a vapor barrier around said gap.

Claim 5

A thermal shield surrounding a pipe running through a hole in a wall comprising a pair of rigid semi-cylindrical mating calcium silicate insulators forming a cylinder with an axial cavity which in turn closely surrounds the pipe, a pair of arcuate metal shields closely surrounding the external surfaces of said insulators, the first of said shields circumscribing a major portion of the outer periphery of one of said insulators said first shield having longitudinal edges and the second of said shields circumscribing more than that portion of the cylindrical surface not circumscribed by the first of said shields, the second of said arcuate metal shields overlapping the longitudinal edges of the first of said shields and gripping the first arcuate metal shield in captured relation at the overlapping surfaces, a pair of neoprene coated asbestos rope rings disposed around and proximate to the opposite ends of the cylindrical element formed by the assembly of the insulators and shields, a pair of flanged telescoping tubular members disposed in the hole in the wall having the flanges mounted on and sealed to opposite sides of the wall, respectively, said tubular members concentrically surrounding both the pipe passing through the wall and the cylindrical element surrounding the pipe with said rope rings spacing said cylindrical element within said tubular members and forming a sealing and aliding fit therebetween.

Claim 6

A thermal shield surrounding a pipe running through a hole in a wall comprising a pair of rigid semi-cylindrical mating calcium silicate insulators forming a cylinder with an axial cavity which in turn closely surrounds the pipe, a pair of arcuate metal shields closely surrounding the external surfaces of said insulators, the first of said shields circumscribing a major portion of the outer periphery of one of said insulators said first shield having longitudinal edges and the second of said shields circumscribing more than that portion of the cylindrical surface not circumscribed by the first of said shields, the second of said arcuate metal shields overlapping the longitudinal edges of the first of said shields and gripping the first arcuate metal shield in captured relation at the overlapping surfaces, a pair of neoprene coated asbestos rope rings disposed around and proximate to the opposite ends of the cylindrical element formed by the assembly of the insulators and shields, a pair of flanged telescoping tubular members disposed in the hole in the wall having the flanges mounted on and sealed to opposite sides of the wall, respectively, said tubular members concentrically surrounding both the pipe passing through the wall and the cylindrical element surrounding the pipe with said rope rings spacing said cylindrical element within said tubular members and forming a sealing and aliding fit therebetween.

Claim 7

The thermal shield according to claim 4, wherein said arcuate metal shields are sectioned to form two pairs of shields each closely circumscribing the external surface of said mating insulators, said two pair of shields being disposed at the opposite ends of said insulator and spaced apart such that one pair does not abut the other pair forming a gap therebetween which thermally insulates one end of the metal shields from the other, and each of said asbestos rope rings being disposed around the one of the pair of shields proximate the outer ends thereof but within the tubular member.

Claim 8

The thermal shield according to claim 5, wherein a strip of vapor barrier tape surrounds the gap together with a portion of each pair of metal shields adjacent to the gap, said tape adhering to outer surface of said metal shields and the exposed portion of the mating insulators to maintain a vapor barrier around said gap.

Claim 9

The thermal shield according to claim 6 wherein the pipe surrounded by the said cylindrical element comprised of said insulators and said shields is firmly supported within and generally along the axis of said telescoping tubular members by said asbestos rope rings whereby the tubular members and their respective flanges are thermally insulated from the cylindrical element and smoke and superheated air cannot pass through the hole in the wall through which the pipe passes as a result of the seals created between the pipe and the wall by the thermal shield.

Claim 10

The thermal shield according to claim 4 wherein said pair of mating calcium silicate insulators are treated with a waterproofing substance whereby moisture will not break down the calcium silicate.

Claim 11

A thermal sHield surrounding a pipe running through a hole in a wall comprising a pair of rigid semi-cylindrical mating calcium silicate insulators forming a cylinder with an axial cavity closely surrounding the pipe, said mating insulators being treated with a waterproofing substance, two pairs of arcuate metal shields closely circumscribing the external surface of said insulators and disposed at opposite ends of said insulator to form a gap therebetween, the first shield of each pair of said shields circumscribing one half of the outer periphery of said insulators said first shield having longitudinal edges and the second shield of each pair of said shields circumscribing more than one half of the outer periphery of said insulators and overlapping the longitudinal edge portions of the first shield of each pair of said shields in captured relation thereto, said pairs of shields being placed into captured relation by sliding the second shield of said pairs of shields generally parallel to the axis of said pipe onto the longitudinal edge portions of the first shield of said pairs of shields, a strip of vapor barrier tape surrounding said gap between said shields together with a portion of each pair of metal shields adjacent to said gap, said tape adhering to the external surface of said metal shields and the exposed surface of said insulators to maintain a vapor barrier around said gap, a pair of neoprene coated asbestos rope rings disposed around the respective pair of shields and proximate to the opposite ends of the cylindrical element formed by the assembly of the insulators and shields, a pair of flanged telescoping tubular members disposed in the hole in the wall, said flanges being mounted on opposite sides of the wall, respectively, and said tubular members concentrically surrounding the pipe passing through the wall, the cylindrical element surrounding the pipe, and the rope rings surrounding the cylindrical element, said rope rings spacing said cylindrical element within said tubular members and forming a snug, sealing and sliding contact therebetween.

Claim 12

A thermal sHield surrounding a pipe running through a hole in a wall comprising a pair of rigid semi-cylindrical mating calcium silicate insulators forming a cylinder with an axial cavity closely surrounding the pipe, said mating insulators being treated with a waterproofing substance, two pairs of arcuate metal shields closely circumscribing the external surface of said insulators and disposed at opposite ends of said insulator to form a gap therebetween, the first shield of each pair of said shields circumscribing one half of the outer periphery of said insulators said first shield having longitudinal edges and the second shield of each pair of said shields circumscribing more than one half of the outer periphery of said insulators and overlapping the longitudinal edge portions of the first shield of each pair of said shields in captured relation thereto, said pairs of shields being placed into captured relation by sliding the second shield of said pairs of shields generally parallel to the axis of said pipe onto the longitudinal edge portions of the first shield of said pairs of shields, a strip of vapor barrier tape surrounding said gap between said shields together with a portion of each pair of metal shields adjacent to said gap, said tape adhering to the external surface of said metal shields and the exposed surface of said insulators to maintain a vapor barrier around said gap, a pair of neoprene coated asbestos rope rings disposed around the respective pair of shields and proximate to the opposite ends of the cylindrical element formed by the assembly of the insulators and shields, a pair of flanged telescoping tubular members disposed in the hole in the wall, said flanges being mounted on opposite sides of the wall, respectively, and said tubular members concentrically surrounding the pipe passing through the wall, the cylindrical element surrounding the pipe, and the rope rings surrounding the cylindrical element, said rope rings spacing said cylindrical element within said tubular members and forming a snug, sealing and sliding contact therebetween.

Claim 13

The thermal shield of claim 9 wherein the waterproofing substance comprises 17 parts Shell Super VMSP Naphtha to 2 1/2 parts Dow Corning 773 Silicone.