Abstract: A flexible duct for use in a heating or cooling system having an elongated wire cemented between two elongated plastic ribbons and wound into a multi-turn coil, a portion of the plastic ribbons of each turn overlapping and being cemented to a portion of the plastic ribbons of adjacent turns to form a duct, the wire forming a plurality of identical turns with each turn having a pair of U-shaped end portions and a pair of elongated portions, the elongated portion being interconnected by an end portion and being aligned with the elongated portions of adjacent turns. A method of making such duct and apparatus for making such duct are also disclosed.

Abstract: An elongated strip of sheet material is transported over a frame and along a transversely movable carriage on which upper and lower circular rotary cutting knives are mounted to slit the strip longitudinally into a desired portion to be processed immediately and a remnant portion for later use. The free edge of the desired portion is urged against a longitudinal guide, adjustably secured to the carriage, for adjusting the width of the desired portion. The strip is urged against the guide by a vertical crab wheel, locatable against the strip, and disposed at a slight acute angle to the longitudinal direction of the strip. The carriage and the guide are freely movable in a transverse direction to accommodate non-linearities in the strip.

Abstract: A machine for slitting strips of elongated sheet material from a wider roll of the material in which two spaced mandrels are mounted vertically on a frame and the sheet of material extends from the mandrel past a carriage to the second mandrel. The carriage carries two engaging circular knives mounted on the carriage for rotation about vertical axes, the knives engaging opposite sides of the sheet to cut a strip from the upper edge of the sheet. The carriage is provided with a guide to maintain the selected distance from the upper edge of the sheet to the cutting plane of the circular knives.

Abstract: An energy saving heat recycling system for circulating hot air from the upper portion of a building, near the roof, to the lower portion of the building, near the floor level, to reuse the hot air to heat the lower portion of the building, such system comprising a generally cylindrical supporting sleeve, an electric fan including a fan motor mounted within the sleeve and a fan rotor to be rotated by the motor within the sleeve, means for mounting the sleeve in the upper portion of the building whereby the electric fan is to draw hot air into the intake end of the sleeve while discharging the hot air from the discharge end of the sleeve, and a flexible tubular duct connected to the discharge end of the sleeve for conveying the hot air to the lower portion of the building near the floor level, the duct being in the form of a tube made of thin flexible material which is compactly foldable for storage and shipment and is readily capable of being bent around obstructions and threaded through openings in the buildi

Abstract: Apparatus for automatically cutting sections of measured length from a coil of an elongated strip which has a rotatable mounting device for the coil, a feed and straightener driven at a constant speed for pulling the strip from the coil, a hump table, a speed control unit with a pair of pinch rolls, a shears, and a device for generating a first signal when the leading edge of the trip has been transported past the shears by a distance equal to the length of the measured section for breaking the pinch rolls to stop movement of the strip at the shears and for actuating the shears, said device also generating a second signal when the leading edge of the strip has been transported past the shears by a shorter distance than the measured length of the section for actuating a pneumatic cylinder to drive the pinch rolls toward each other and grip the strip, the lower pinch roll being driven by a constant speed motor at a cicumferential speed less than the speed of the strip from the feeder, thus producing a hump betw