Abstract: This invention relates to a method of forming a fire resistant seal from a tubular ring of elastomeric material having a garter spring movably mounted in the bore of the seal.

Abstract: The shroud is formed from sheet material and is cylindrical in shape. A plurality of spacers are associated with the sheet material. These spacers are designed to engage the outer surface of a duct to hold the cylindrical sheet material in radially outwardly-spaced relationship to the duct, defining thereby an insulating air gap between the outer surface of the duct and the shroud. The angular space between the spacers serves as gas channels to permit gas to flow between the shroud and the outer surface of the duct, along the length of the duct. The shroud has a straight axially-extending slot along its entire length for easy removal from a duct. An axially-extending edge receiving pocket is formed on the shroud adjacent to the slot for receiving the adjacent longitudinally extending edge of the slot to hold the shroud in a cylindrical shape and to provide a gas tight closure for the slot.

Abstract: An air circulation apparatus for achieving more uniform temperature conditions throughout the room by drawing cooler air upwardly from the floor level and discharging it near the ceiling. The apparatus comprises a vertical tubular member having an air inlet at its lower end and a plurality of circumferentially spaced air outlets at its upper end, a motor-driven blower in the lower portion of the tubular member and a deflector mounted adjacent the outlets for directing the moving air through the outlets in a lateral direction. The tubular member is frictionally supported between the floor and ceiling by means of a pair of rubber capped poles extending from the upper and lower ends thereof. The upper pole is telescopically received within the tubular member and urged into frictional engagement with the ceiling by means of a compressed spring. If desired, decorative brackets suitable for hanging flower pots or the like may be mounted on the tubular member.

Abstract: The flexible ball joint is provided with a bellows which is protectively mounted inside a shell. A portion of the shell serves as the spherical socket and a portion of a sphere serves as the ball for the ball joint. The ball is mounted in the socket and is concentric therewith. One end of the bellows is attached to the shell and the other end is attached to the ball. A plurality of generally equally angularly-spaced Purbon buttons are mounted on a support ring which is mounted on the surface of the socket. These buttons are in engagement with the surface of the ball so the ball joint can pivot freely over a wide range of temperatures. A generally spherical shell-like member is mounted in fixed and closely-spaced concentric relation to the outer surface of the spherical socket to limit axial movement between the socket and the ball and hold the Purbond button on the support ring. In addition, the shell-like member has formations shaped to define cooling channels for the protective bellows.

Abstract: A hot air duct is formed from thin walled metal tubing. The duct is provided with a plurality of linearly spaced reinforcing rings. Each reinforcing ring is formed from sheet metal and is channel-shaped in cross-section. The rings are rigidly secured to the outer surface of the duct and positioned so they project radially outwardly from the duct with the channel portion inwardly open and facing the outer surface of the duct. With this arrangement the channel portions are closed off, defining ring shaped chambers around the duct. Each ring shaped chamber surrounding the duct is provided with holes to provide communication between the ring-shaped chamber and the ambient air around the external surface of the duct.

Abstract: A bag for breathing apparatus having an internal zigzag passageway between an inlet and an outlet, the bag being formed of flexible material presenting an interior surface of silicone rubber and an exterior surface of a fluoroelastomer based on a copolymer of vinylidene and hexafluoropropylene the means and method of manufacture involving a mounting plate which carries supporting panels for the end wall and partition wall components of the bag, the side walls and bottom wall components of the bag being held in contact with selected margins of the components supported on the panels by a foldable external retaining structure to permit heating of the bag components to a bonding temperature or to permit setting of appropriate adhesive.