Abstract: A process for mounting lugs or projections on a thin metal sheet, by forming the lugs and/or projections out of the thin metal sheet by way of massive forming. Such a thin metal sheet in the form of a thin sheet metal strip is used preferably for forming rectangular tubes for an exhaust gas heat transfer device which, for guiding the exhaust gas, is provided with a bundle of these rectangular tubes.

Abstract: An air conditioning duct for use in confined spaces such as the instrument panel of an automobile. To eliminate dripping from condensation formed from warm ambient air, the duct is coated with a superabsorbent material which absorbs condensation and promotes evaporation thereby retarding dripping from the conduit for an extended period of several hours. The superabsorbent material may be adhered to the duct by an adhesive or molded in situ in a blow molding process.

Abstract: A duct joint structure for assembling a duct used for air conditioning or venting equipment, an assembly tool for assembling the joint portion, an assembly method of a duct, and a hanger for the duct with the duct joint structure. A duct joint structure includes at least two duct plate members arranged substantially at right angles in a sectional view. An end of a first plate member is bent substantially in accordance with the orthogonal relation, and the second plate member is formed at the forward end thereof with a U-shaped groove to accommodate the bent portion of the first plate member. A guide rail is protruded at not less than 90 degrees with respect to the outer surface of the second plate member from the side thereof spaced from the U-shaped groove.

Abstract: An apparatus for converting a conventional rectangular HVAC duct to a flat oval shaped duct where a conventional rectangular duct fitting is provided with a converting means to convert the opening from rectangular to a flat oval. The converting means is formed by a pair of arcuate members defining semi-circular edges and having recesses to receive portions of parallel members. The apparatus utilizes two sheet metal pieces which are formed in arcuate contours that connect between flat edges of parallel sheets to form the oval shape.

Abstract: A wastewater treatment apparatus is provided which includes at least an aeration chamber and a clarification chamber having a common wall therebetween, a transfer port opening through the common wall between a lower portion of the clarification chamber and the aeration chamber, an aerator mechanism in the aeration chamber for creating wastewater flow currents which flow through an inlet portion of a flow augmenting device located in the common wall above the transfer port. The flow augmenting device is a conduit or pipe having a discharge outlet adjacent the lower portion of the clarification chamber through which exits the flow from the aeration chamber resulting in solid particles being agitated and returned from the clarification chamber lower portion into the aeration chamber through the transfer port.

Abstract: A duct for gas flow applications is provided with a replaceable insulating duct liner that can be axially inserted into and removed from a tubular shell of the duct. Preferably, the replaceable insulating duct liners comprise fibrous and/or cellular insulation materials. Duct systems using duct sections with replaceable insulating duct liners can be maintained by removing duct sections from the system; removing the replaceable insulating duct liners from the duct sections; inserting new replaceable insulating duct liners into the duct sections; and replacing the duct sections into the duct system.

Abstract: A method and structure for the integral reinforcement of HVAC ducting including the steps of laying out one or more planar sheet metal blanks having portions defined therein dedicated for integral rib reinforcement; placing relief slots in the dedicated portions of the blank corresponding to the seams and folding lines; forming the integral reinforcement rib from the dedicated blank material; bending the blanks along fold lines and assembling the rectangular duct; and placing rib corners over the reinforcing rib ends at the corners of the duct. Alternatively, the step of cutting the reinforcing rib at the fold lines may be substituted for the step of placing slots in the blank. The completed structure includes reinforcing ribs circumferentially positioned around the duct or on the planar duct surfaces, the ribs being formed of, and integral to, the duct itself. Pre-manufactured rib corners serve to seal and strengthen the reinforcement ribs as required.

Abstract: A duct for transporting air within an air handling system. The inventive device includes a plurality of panels coupled together to form a hollow duct. The panels are sealed along interior surfaces thereof by coextensive foil webs. The panels can be formed from a single blank and subsequently folded into an operative orientation for use in a heating and air conditioning installation.

Abstract: Rectangular sheet metal duct sections with integral outwardly-and-rearwardly formed end flanges are conventionally made from coiled strip metal to lengths provided by the width of the coil stock, ordinarily slightly less than five feet. As is common practice, outward-and-reverse facing flanges are formed on both ends of each wall of the duct section. The spaces between the flange ends at the corners of the duct section are filled by heavier cornerpieces having arms projecting at right angles. Crimping the outstanding flanges over the corner arm portions completes a duct section. According to the present invention, a linear array of embossed surface portions is formed in the duct wall close to each outwardly projecting flange portion and beneath its reverse-facing portion.

Abstract: A cornerless slip-on flange system for duct connections. The system utilizes flange pieces to form a frame at the end of a duct section without the use of connectors at the corners of the flanges, the frames of two sections being used to join the two ducts sections together. The flange pieces each have a male end and a female end with the male end of one flange piece being inserted into the female end of the adjacent flange piece at each corner to form the frame. The frames can then be installed on the ends of the ducts to be joined and fastened together by inserting suitable fasteners through preformed openings in the flange pieces.

Abstract: Modifying that type of integral flange outstanding from a sheet metal duct characterized by an outstanding first width of sheet metal and a second substantially equal width bent reversedly back to extend at 180.degree. from the first, in the present flange a sheet edge margin is bent reversedly back and inwardly between the second and first such widths. As compared to prior art flanges, this results in substantially lessened deflections under internal duct pressures without appreciable increase in sheet metal used. An added advantage is that the sheet metal edge is positioned so that it cannot endanger workmen's hands.

Abstract: An air duct is disclosed which includes a tubular member formed from a metal sheet. A paper is disposed around an outer periphery of the tubular member for preventing condensation droplets condensed on the tubular member from dripping, and an adhesive is interposed between the tubular member and the paper to adhesively secure the tubular member and the paper. Furthermore, a paper for an air duct, adapted to be secured to an outer periphery of the air duct, is disclosed. The paper is produced from a material including a papermaking pulp and is characterized by the following: a wet strength of at least 0.3 kgf/15 mm, a critical value for dripping of water droplets of at least 45 g/m.sup.2, and a basis weight of 40 to 5000 g/m.sup.2.

Abstract: A reinforced duct includes a duct section having a peripheral skin of sheet metal, a plurality of lengths of metal straps, each strap being configured to have a cross section including a V-shape portion and inwardly turned edges spaced from the apex of the V to form a gap between the edges. The straps circumscribe the duct with the apices of the V-shapes away from the peripheral skin. A plurality of screws driven outwardly through the peripheral skin into the gaps in the circumscribing straps and engage the inwardly turned edges to bind the skin to the straps so that the straps reinforce the skin to prevent excessive flexure of the skin.

Abstract: A connector assembly for connecting double walled insulated tubing uses connector members each having inner and outer walls engaging inner and outer walls of the tubing, and end walls which are configured to interengage and form a lapped joint, each outer wall and optionally each inner wall of each connector member being associated with a support ring so that each tubing wall is clamped between a connector wall and a support ring by blind rivets or other fastenings passed through the connector wall, the tubing wall and the support ring. The connector assembly can be either factory applied or applied in the field using available hand tools, yet provides a neat and reliable connection.

Abstract: Ventilation ducting having a substantially oval and/or elliptical cross-section includes an intermediate section, and an end section at opposite ends of the intermediate section. Both the intermediate and the end sections include a pair of adjacent ducts. The ducts in the intermediate section are separated along their length by a common wall. The common wall may be perforated sheet, mesh or net material. The ducts at each end section are separate tubular members. An engaging device is provided at the intermediate section for suspending the ducting above the ground. A coupling device is provided at each end of the intermediate section for joining together adjacent lengths of the ventilation ducting.

Abstract: A refrigerant transporting hose having an inner tube, an outer tube located radially outwardly of the inner tube, and a reinforcing fiber layer interposed between the inner and outer tubes, such that the reinforcing fiber layer and the inner and outer tubes constitute an integral tubular body, the inner tube including a resinous layer formed of a composition containing as a major constituent thereof a blend of at least one aliphatic polyamide and at least one aromatic polyamide.

Abstract: An improved coating is provided for fiberglass insulation articles which is coated onto the fiberglass insulation, thereby providing the fiberglass insulation with good mechanical properties and other desirable properties such as low emission of volatiles, fire retardency, low potential smoke generation and low air friction.

Abstract: A fluid flow distribution duct for receiving temperature controlled air from duplicated Environmental Control System units in an aircraft air conditioning system and providing balanced distribution of the respective air flows to port and starboard sides of the aircraft cabin. The invention provides efficient separation and distribution of the respective flows, flow mixing occurring at or about the cabin inlet position. By this arrangement, the need for flow mixing chambers obviated giving a more efficient flow and compact duct arrangement than hitherto.

Abstract: Connecting flange portions are form fitted in one piece with an essentially hollow profile at the end of a duct wall portion of a duct section formed from sheet metal. Supporting arms of the connecting flange portions extend back to the duct wall, and are folded into folding pockets which are formed from the duct wall. To attach intermediate connectors having larger duct cross-sections, the supporting arms can have outwardly extending protrusions.

Abstract: This invention is concerned with a hose construction particularly suitable for Freon service in refrigeration systems. The hose comprises (1) a core tube of polyamide covered by an elastomeric friction layer such as EPDM rubber having incorporated therein a calcium ion source and an adhesion system and a curative, (2) a layer of tensioned reinforcement strands, (3) an adhesive/barrier/friction layer such as an ethylene acrylic acid copolymer, (4) a second layer of tensioned reinforcement strands, and (5) a cover selected from chlorobutyl rubber or other suitable materials wherein the chlorobutyl rubber utilizes a bis-dienophile as a crosslinker.

Abstract: A duct, presumably that of a utility boiler or the like, has a frame mounted on its internal walls. Parallel louver blades are mounted in the frame and linked for simultaneous actuation to move the louver-blades between a first position where they seal the frame opening against the flow of gaseous fluid and a second position where they permit the relatively free flow of gaseous fluid through the frame. Bearings for the louver shafts are mounted external the duct in which the frame is mounted and a truss is attached to the upstream and downstream edges of the frame to insure dimensional stability under the stress applied to the duct by the varying pressure and temperature of the gaseous fluid passing through the duct.

Abstract: Two telescopically mated tubes carry on their opposite ends laterally extending flanges for engaging the inner faces of opposite panels of rectangular fiberboard ducts to brace them against sagging and/or buldging caused by air-pressure-difference and/or gravitational forces. The inner tube has a series of notches or apertures formed therein and the outer tube has a tongue or pin engageable with a selected notch or aperture to lock the tubes in length-adjusted relative positions. Optionally, the opposite tube ends can have a bendable tongue or a barbed pin for penetrating through the fiberboard wall. The tongue can be bent over the outer face of the duct panel to brace the panel against outward buldging. The barbed pin can receive a pressed-on resilient nut for the same purpose. The tubes can be economically formed from sheet-metal strips bent to define, in cross-section, nearly closed triangles or nested U's.