Abstract: A profile for the coupling of adjoining channel members comprises a front wall for extending perpendicularly from a wall of the channel member, a back wall extending at least partially parallel to the front wall, a front flange connected to the front wall, a back flange connected to the back wall and a deformable sealing material in the space between the front wall, the back wall and the flanges. The profile is constructed by folding a strip of material along parallel fold lines. A deformable sealing material is applied to the strip, and when the strip is folded, the sealing material is deformed so as to fill a substantial portion of the space between the front wall, the back wall, the front flange and the back flange of the profile.

Abstract: A duct joining system having two L-shaped connectors for each duct corner. Each connector has two substantially perpendicular legs forming a corner region and has an inside and an outside surface with the outside surface of one L-shaped connector abutting the outside surface of the other L-shaped connector when the ducts are joined. An irregularly shaped opening is formed in the corner region of each L-shaped connector in alignment with the opening in the abutting connector. A tab having an enlarged head and a stem is integrally formed with and extends inwardly from the peripheral edge of each of the openings. A score line is formed at the base of the stem of each tab on the outside surface of the connector to allow the tab to be bent outwardly about the score line so that the tab can be inserted through the opening in the abutting L-shaped connector and than bent over to lock the connectors together.

Abstract: A universal duct elbow as for the vent system of a clothes dryer, formed of a body and a pair of swivel sleeves rotational on the body. The body has an outer 180.degree. portion of a configuration like that of a quarter toroid, and an inner 180.degree. portion like a square type elbow. The center line radius is less than about 0.6 of the duct diameter, enabling a duct assembly using the elbow to fit into a space only slightly larger than the duct diameter. The body is formed of an L-shaped plate having flow openings in the two legs of the L, plus two joined mirror image, arcuate elements. At these sleeves are radially extending flanges of the legs of the L to enable attachment to a wall.

Abstract: A dryer duct assembly employs two universal elbow components and at least one flexible component. The flexible component has ends capable of connecting to another flexible component or to a universal component without the use of other devices such as hose clamps to secure connection. Each elbow has ends capable of attaching either to the wall opening or the dryer, in addition to attaching to the flexible component in the same manner as the flexible components may attach to each other. The elbow has an outer portion resembling the outer portion of a quarter-toroid, and a square type inner portion. The outer portion is made of a pair of mirror image hemi portions connected at adjacent flanges. The inner portion has an L-shaped plate with flow-through orifices in each leg of the L.

Abstract: Apparatus for connecting the ends of a pair of oval duct sections includes a pair of arcuate frame sections and a pair of linear intermediate frame sections that are connected to each other by connector pieces having leg portions extending into receivers in the profile of the frame sections. The connector pieces have stop members which abut the edges of the frame sections and provide a gap therebetween. The lower stop member is offset rearwardly from the body portion of the connector piece and the edge portion of the oval duct extends outwardly into the gap portion. The oval duct end portions are connected to the duct connector frame members and pairs of frame members are positioned in adjacent relation with a gasket member therebetween. The connecting members include a securing device to secure the adjacent frame members to each other and exert a compressive force on the gasket member therebetween.

Abstract: A butt connection between two air duct sections made of sheet metal has two flange frames fastened to opposed ends of two duct sections. Each flange frame is L-shaped in radial section, having an outer radially extending flange leg and an inner flange leg in a duct section, each flange frame comprising a hollow into which a leg of an L-shaped intermediate connection is fitted. Each flange frame is connected to the other flange frame, as by bolts, etc. The butt connection is equally applicable to duct sections which are of round, flattened oval, and rectangular cross sections, with the same flange frame shapes and essentially the same intermediate connector being usable.

Abstract: A flexible duct assembly having a thin peripheral wall formed with helical, i.e., sprial, ribs and adjacent grooves or valleys, the apex of each rib and valley advancing helically with axial extension of the duct, and a rotary joint on at least one end of the duct to relieve the torque otherwise resulting from the helical advancement.

Abstract: An air flow conduit system is presented for air flow communication between an air filter mechanism and an engine intake manifold. The conduit system comprises substantially rigid straight conduit members joined in fluid communication by connector systems having elbow-shaped conduit members. A narrow end of a conduit member is received within a broad end of a next adjacent conduit member. Sealing engagement occurs via an elastomeric seal member having ribs thereon positioned radially between the inner and outer conduits. A preferred rib arrangement is provided, to insure a flexible, multi-point, seal system.

Abstract: Apparatus for connecting the ends of a pair of oval duct sections includes a pair of arcuate frame sections and a pair of linear intermediate frame sections or a pair of frame sections with a linear portion and a pair of semi-circular end portions. The sections are connected to each other by connector pieces having leg portions extending into receivers in the profile of the frame sections. The connector pieces have stop members which abut the edges of the frame sections and provide a gap therebetween. The lower stop member is offset rearwardly from the body portion of the connector piece and the edge portion of the oval duct extends outwardly into the gap portion. The oval duct end portions are connected to the duct connector frame members and pairs of frame members are positioned in adjacent relation with a gasket member therebetween. The connecting members include a securing device to secure the adjacent frame members to each other and exert a compressive force on the gasket member therebetween.

Abstract: A dual fitting chimney cap adapted to be connected to chimney stacks of differing sizes, the chimney cap including a cylindrical housing having an upper housing portion formed with a plurality of apertures, and a lower housing portion for attachment to an upper open end of a chimney stack of conforming cylindrical contour, the lower housing portion having a cylindrical cross-section of a presecribed diameter, and an annular transition portion integrally interposed between and interconnecting the upper and lower housing portions, the annular transition portion including a first annular region and a second annular region integral with and interconnected to the first annular region, the first annular region having a prescribed diameter larger in dimension than the diameter of the second annular region and also larger in dimension than the diameter of the lower housing portion, the second annular region having a prescribed diameter smaller in dimension than the diameter of the lower housing portion.

Abstract: A clamp suitable for joining a pair of tubular members such as truck exhaust pipes including a metal band having a reinforcing bar at each end wrapped more than one turn, each wrapped reinforced end forming at least one hold for receiving, threading, and securing a set of bolts and nuts. The band is preferably formed from an aluminized steel, and the reinforcing bars may be non-plated. Embodiments using only the wrapped ends without reinforcing bars, folded rims, beading, and bolt-securing plates are also disclosed.

Abstract: A threadless coupling for pipes has a cylindrical coupling body having longitudinally-extending slots or sections along the entire length thereof, a pair of grip sections forming grooves facing oppositely from each other on the outside of the edges of both ends of the opening section of the coupling body, and a grip case which is slidable fitted for coupling on the pair of grip sections. The grip case is tapped with a hammer of the like to slide onto the pair of grip sections, thereby compressing the coupling body around the conduits to be coupled by decreasing the gap between the pair of grip sections and accordingly reducing the diameter of the coupling body.

Abstract: A compressible fitting for the manufacture of a permanent, tight connection between tubes. The fitting has at least one end, which has a hook-shaped cross section and a bead-like configuration, which end holds an O-ring and can be compressed with the tube. An adjacent cylindrical section extending in the longitudinal direction, which is provided at the end with a bead-shaped recess acting as a stop for the flat-ended tube which can be inserted. To create a compressible fitting that can be economically manufactured and still provide rapid connection technology, the invention proposes that the area characterizing the type of fitting is designed as a cast or molded basic body fabricated from a metal or non-metal material, that is connected to a standardized connection piece made of sheet metal, whereby this connection piece has a bead-like end holding an O-ring and an adjacent cylindrical area, which is provided at the end with a bead-like recess acting as a stop for the flat-ended tube which can be inserted.

Abstract: Apparatus for readily connecting a round branch duct take off fitting of a forced air heating or air conditioning system to any size diameter round duct main with one size semi-flexible duct take off fitting. A hole is cut into the main round duct. The take off fitting is rigidly fastened at the contact tangent point of the main duct and the flat surface of the fitting. A bendable base flange, that is connected to a semi-flexible tubular member, is then formed around the main round duct and is fastened to same. As the bendable base flange is formed the semi-flexible fabric portion deforms to accommodate any size diameter main duct. Gaskets between connecting surfaces prevent air leakage.

Abstract: A flexible connector is provided for coupling a source and discharge outlet for fluid transfer. The connector has a tubular metal bellows, an inner tubular metal liner, couplings at each end of the bellows having articulated joints between the inner liner and the couplings, such that the liner provides isolation between gases flowing through the connector and the bellows, and protective structure encompassing the bellows.

Abstract: A duct joining system having two L-shaped connectors for each duct corner. Each connector has two substantially perpendicular legs forming a corner region and has an inside and an outside surface with the outside surface of one L-shaped connector abutting the outside surface of the other L-shaped connector when the ducts are joined. A orifice is formed in the corner region of each L-shaped connector in alignment with the orifice in the aubutting connector. A cleat is integrally formed with and extends inwardly from the peripheral edge of each of the orifices. A score line is formed at the base of each cleat on the outside surface of the connector to allow the cleat to be bent outwardly about the score line so as to extend through, and over the peripheral edge of, the orifice in the abutting L-shaped connector to lock the connectors together.

Abstract: A duct connector frame having frame sections with a bottom wall, a front wall, a top wall and a rear wall. The rear wall extends downwardly at an angle to the front wall and forms a generally triangular opening in the frame section. A channel shaped pocket or support member is formed in the opening to receive and support the lower edge of a corner piece leg portion and the rear wall, adjacent the top wall, has an inturned portion that forms a stop within the opening for the upper rear surface of the corner piece leg portion. The support member and the stop maintain the corner piece leg portion in the opening in fixed abutting relation with the rear surface of the frame front wall.

Abstract: An axial force resisting pipe coupling for coupling pipes in aligned end-to-end relation. The coupling is of a simplified, economical construction comprising a plurality of axially aligned spaced clamps, including a central clamp and two outrigger clamps, attached to a common bar, and the coupling may be formed by retrofitting an existing central clamp with the outrigger clamps and bar. Each of the clamps consist of a generally circular band terminating in opposed connecting end flanges and are attached to the bar at the flanges by fasteners which also facilitate circumferential contraction and expansion of the clamps. Projections may be formed on the bands for embedding into the pipe members to minimize the likelihood of the pipes pulling apart due to high tension forces.

Abstract: A joint assembly for connecting the ends of a pair of generally rectangular sheet metal duct sections includes a pair of frame members secured to each other and connected to the respective duct end sections. The frame members each include four flange portions. Each flange portion has an upstanding channel shaped leg portion and an angularly extending duct receiving leg portion. A corner piece connects adjacent flange portions and extends into the channel portions of the upstanding leg portions to form the generally rectangular frame. The end portions of the ducts are inserted into longitudinal openings of the duct receiving leg portions. A flowing type gasket material is positioned in a longitudinal pocket of each flange. The end of each duct wall partially displaces the gasket material so that the gasket material extrudes outwardly around the duct wall and between the ends of the flange portion and the corner piece.

Abstract: A pair of frame members are secured to the ends of a pair of ducts having a generally circular or arcuate configuration. Each frame member has the same generally circular or arcuate configuration and has an inner vertical wall and an outer vertical wall. The outer vertical wall is connected to a sloped rigidifying portion which extends outwardly from the inner vertical wall. Both the inner and outer vertical walls have horizontally extending flanges which are in abutting relation and their end portions are clampingly engaged. The frame members have a circumferential or peripheral dimension less than the circumferential or peripheral dimension of the duct member so that at least one gap is formed in the circular or arcuately shaped frame member. The frame members are positioned on the duct end portions by inserting the frame member flange portion inside the duct end portions with the top surface of the frame member upper flange abutting the underside of the duct.

Abstract: A corner bracket 20, 120 forming part of a system of corner brackets adapted for mechanically inter-connecting in an air tight manner generally rectangular duct portions 37, 38. A first bracket 12 on the end of a first duct 37 is placed in adjacent, abutting, back to back relationship with a second bracket 6 on a second duct 38 and similarly at all four corners of the duct ends. Tabs 27, 127 which are formed from the corner bracket 20, 120 are located so as to be foldable over the adjacent, back to back brackets so as to mechanically bind the brackets together. The folding operation can be performed with hand tools such as hammers and the like. Using appropriate seals, an air tight, mechanically sound duct joint is accomplished. The brackets and the bracket inter-connection system are particularly suited for use with air conditioning duct networks.

Abstract: A locking clip (1) for air conditioning ducting or the like where the ducting (13, 14) is of the type which has flanges (11, 12) protruding upwardly and generally at right angles from the ends of the ducting. The clip 1 is adapted to clamp the outer faces of the flanges (11, 12) at the same time, resist sliding of the clip (1) along the mated flanges (11, 12) by the action of central tabs (5, 6) protruding from the spine (4) of the clip (1) between the inside, mating faces of the flanges (11, 12). In one form serrations on the ribs (5, 6) help to maintain frictional engagement between the ribs (5, 6) and the inside faces of the flanges (11, 12).The locking clip (1) is particularly suited to use with clip arrangements on air conditioning duct so as to improve the resistance of such clips to creep along the mating flanges (11, 12) under the influence of gravity, vibration and the like.

Abstract: An improved gutter-downspout connection unit to be used in connecting a conventional gutter to a conventional downspout in rain water removal systems which is generally anvilar in structure comprising an upper body having first and second upper body sides and first and second end pieces with at least one of the end pieces having a smooth curvature which downwardly and inwardly converges towards the other end piece wherein the upper body sides and the end pieces adjoin each other along common edges such that the upper edges of the upper body sides and the end pieces form a common edge defining a top opening, and the lower edges of the upper body sides and the end pieces form a common edge defining a bottom opening substantially opposite the top opening, such that and debris and water contained in the conventional gutter will follow a curved path from the gutter to the downspout thereby making the gutter-downspout connection unit essentially clog-resistant.

Abstract: An improved clamp assembly for clamping the overlapping ends of metal tubes in an exhaust system. The clamp assembly includes a metal ring having a pair of overlapping end portions disposed in side-by-side contact. A generally U-shaped bracket is secured to each of the end portions and each bracket has a pair of opposed legs connected by a web portion. Extensions project longitudinally outward from the end of each leg and the extensions are offset laterally from each other. One leg of each bracket is welded to one of the end portions of the ring and the welded leg is bent adjacent the weld to position the first extension in slidable contact with the other end portion of the ring. The extension of the opposite leg is disposed in side-by-side relation with the first extension and also serves to slidably receive the opposite end portion of the ring.

Abstract: A coupling for attaching a conduit to an external member includes a female housing having a passageway formed therein and extending axially therealong and communicating with the external member. A retainer is disposed in the passageway for retaining the conduit when inserted into the passageway and in response to a withdrawing movement of the conduit from the passageway. A bushing is disposed in the passageway and cooperating with the retainer for allowing disengagement of retainer with the conduit to allow the conduit to be withdrawn from said passageway.

Abstract: A connector for connecting end-to-end two spiral-wound sheet metal air ducts. The connector is an annular structure with opposite end segments, each of which presents an annular recess or groove which is open at its outer end and closed at its inner end and filled with sealing mastic there. The dimension of each recess or groove transverse to the longitudinal axis of the ducts and the connector is substantially equal to the maximum thickness of the corresponding duct (i.e., where its spiral rib is located) so that each duct has a snug sliding fit in the corresponding recess.

Abstract: In the case of a flange connection for rectangular air conditioning ducts which have four walls, four flange profiles with four rectangular angle-pieces are fitted frame-wise on the end of a duct portion. The flange profiles are in this case subhstantially L-shaped hollow profiles which are in each case fitted onto a duct wall and fixed there with a plurality of spot welds. Problematical is the seal between the inner arm of the flange profile and the duct wall, because by reason of spot welds which are situated close to but at a distance from one another, air can flow out into the free atmosphere between them and over the end face of the duct wall. In order to achieve better tightness, there is formed into the hollow profile a bead extending from the front radial portion. An inner arc of the bead lies with a clamping fit on the top of the duct wall and presses it against the inner longitudinal arm so achieving a seal which it is possible easily to implement in manufacture.

Abstract: Ring collar for use in connecting a side branch line to a main header air duct, the ring collar having a tubular sheet metal body with an inlet, an outlet end which is tapered for easy insertion into a tubular member, and a U-shaped channel ring around the body with the open side of the channel facing the outlet end of the body; and a process for connecting the ring collar to the main header.

Abstract: A multiple walled metal chimney formed of a plurality of axially joined chimney sections each of which utilizes positionally captured spacer rings. Joint clamps are used to connect the chimney sections for formation of the complete chimney conduit. The spacer rings are positionally captured between annular shoulders formed in the inner and outer walls of the chimney sections to eliminate welding of the rings. The rings may include an expansion joint to allow circumferential expansion and contraction of the ring with the walls.

Abstract: A structure comprising two interconnected metal tubes used for supplying oil or air. The first tube inserted in the second tube has a tubular wall at its one end and an outwardly swelling circumferential wall formed inside the tubular wall. The second tube has plural slots arranged circumferentially. A seal member is sandwiched between both tubes. A binding band is wound around the slots to compress the portion having the slots, for fastening the tubes together.

Abstract: A connector member for coupling flexible cylindrical tubular duct to the wall of a fibrous duct is comprised of a pair of parallel metal strips, the opposed marginal edges of which are connected to a flexible central strip. A clamp and a slip joint are provided on the respective strips for maintaining the metal strips in a cylindrical configuration, with the ends of the strips overlapping. One said strip including outwardly facing gaskets disposed at opposite sides of the wall of the fiber duct, the other strip including an inwardly facing gasket clamped about the flexible cylindrical ducting.

Abstract: A pair of frame members are secured to the ends of a pair of adjacent generally circular ducts. Each frame member includes a vertical wall extending upwardly from the circular duct and a sloped outer wall angularly spaced from the vertical wall. Each frame member includes an annular pocket for receiving an end of the circular duct, and a base wall abutting the annular pocket. The base wall has a rebent end portion for engaging a plurality of protuberances positioned on the inside wall of the circular duct. The frame members have an expanding means to urge the frame end portions away from each other to increase the diameter of the frame and engage the duct end portion. A gasket is positioned between the vertical walls of adjacent frame members to contact the adjacent vertical walls, and a clamp is positioned in surrounding relationship with the pair of adjacent frame members secured to the pair of adjacent circular ducts. The clamp has a pair of legs, each leg contacting a frame member sloped outer wall.

Abstract: A method of joining a pair of pipes is disclosed. The method includes forming one of the pipes with an enlarged diameter near one end thereof. A radially-outwardly flared section widens from the enlarged diameter toward the end of the pipe. An elastic gasket and a C-shaped rigid ring are placed in the flared section. A second pipe is then inserted inside the enlarged section of the first pipe. The outer pipe is then inwardly deformed by the action of a pressure member, such as the die, applied to the exterior of the outer pipe in the region of the pipe overlap. The free end of the outer pipe deforms plastically inwardly toward the inserted pipe thereby compressing the gasket into sealing engagement between the two pipes and compressing the C-shaped ring. As the C-shaped ring is compressed, the outer pipe is deformed into the inserted pipe so that the ring is engaged by the inner wall of the outer pipe and is wedged into the outer wall of the inserted pipe.

Abstract: A flue gas conduit connector for joining together the ends of flue gas conduits by means of locking tabs on the outer surface of one flue gas conduit which may be bent over a locking ring or the other flue gas conduit, the ends of the flue gas conduits being provided with complemental taper joints and a sealing gasket to provide a leak-proof corrosion resistant inner flue passage uncorrupted by low alloy fasteners.

Abstract: A pair of frame members are secured to the ends of pair of adjacent generally circular ducts. Each frame member has a generally circular configuration and has an inner vertical wall, an outer vertical wall. The outer vertical wall is connected to a sloped rigidifying portion which extends outwardly from the inner vertical wall. Both the inner and outer vertical walls have horizontally extending flanges which are in abutting relation and their end portions are clampingly engaged. The frame members have a circumferential dimension less than the circumferential dimension of the duct member so that a gap is formed in the circular frame member. The frame members are positioned on the duct end portions by inserting the frame member flange portions inside the duct end portions with the top surface of the frame member upper flange abutting the underside of the duct.

Abstract: A rigid metal pipe coupling for joining pipe sections comprises a sheet of metal having opposite edges for rolling into a generally cylindrical rigid sleeve. The metal sheet has an integrally formed expansible and contractible means formed intermediate the ends of the sheet, said means is adapted after rolling into said sleeve and under the action of a predetermined force to expand and contract thereby allowing said sleeve to permanently bend and accommodate a desired angle of connection between pipe sections.

Abstract: The end of a duct section having flat sheet metal plates is bent up to form connecting flanges having an essentially hollow closed profile. Flange walls of the connecting flanges bearing the free edges of the duct section are lock-seamed into folding pockets which are formed between the duct wall and the adjoining flange wall. To connect duct sections having larger duct cross-sections, the flange walls can have outwardly extending protrusions for reinforcement.

Abstract: An improved flexible connector material is comprised of a pair of metal strips between which is mounted a flattened tubular configuration including upper and lower flexible sheets or layers encompassing a compressible glass wool batt. The insulation is bonded preferably to the lower layer of a pair of spaced flexible glue lines whereby the tendency of the insulation to become compressed and change in configuration is overcome.

Abstract: Apparatus for the in-situ repair of a pipe comprises a pair of trough-like units each of which has an arcuate wall and each of which is of such size that the two units may closely encircle the pipe. One unit has circumferentially spaced shoulders from which flanges diverge outwardly, and the other unit has free side edges that may be accommodated between the flanges in confronting relation with the shoulders. Clamps may be applied to the assembled units to maintain them in encircling relation with the pipe, the shoulders preventing the application of crushing force on the pipe.

Abstract: A protective cylinder (3) for pipe insulation. The protective cylinder (3) is cut at the rear side of the upper part of a folded section of one edge through a predetermined vertical distance 1.sub.1 from the upper end of a first longitudinal edge. The cut extends obliquely downwardly and outwardly at the front by the same vertical distance 1.sub.1 along a first guide line (9) obliquely downwardly and outwardly extending from a first radius portion (9a) at the upper end of the one edge, to an outside bent portion, to form thereby a first engagement portion extending along the first guide line. This serves as both a fitting guide and a rotation stopper. The cylindrical member also has a second longitudinal edge cut slightly obliquely outwardly and downwardly at the upper part thereof by a predetermined vertical distance 1.sub.3 from a second radius portion (10a) at the upper end of the other edge spaced at a horizontal distance 1.sub.2 from the second longitudinal edge.

Abstract: A chimney liner system for insertion into a masonry chimney from the top of the chimney down to a stove or fireplace insert. If an offset or a chimney shelf exists in the chimney, a flexible metal pipe member is connected to the bottom end of the chimney liner system. A ceramic heat resistant cloth formed as a sleeve encloses the flexible metal pipe member in selected systems, and in some systems, the sleeve encloses the entire chimney liner system. In some applications, the sleeve may be made from a fiberglass cloth sewn or connected to an inner blanket insulation.

Abstract: A cover comprised of two half sections which have end portions that interlock in place to form a closed cover. More specifically, a pipe fitting cover that is used to protect various types of pipe fittings against the intrusion of water and other elements.

Abstract: A flange for connecting two air ducts to one another has a pair of spaced, generally parallel walls and a pair of spaced, generally parallel legs fast with, and extending perpendicular to, the walls. The flange legs are designed to embrace and grip a wall of an air duct while the flange walls define a chamber adapted to receive one leg of an angle serving to connect the flange to a neighboring flange. One of the flange legs is plastically deformed so as to define a cavity and has a surface facing the other flange leg. The cavity is open to this surface and accommodates an elastomeric seal which projects from the cavity to a location beyond the surface. The seal is elastically compressed in the cavity to retain the seal therein and such compression may be achieved by plastically deforming the respective flange leg after the seal has been positioned on the same.

Abstract: Butt joint between two thin-walled round sheet metal pipe sections. The butt joint has a flange ring (14) with a triangular hollow section at each pipe end (10); said hollow section has a slit (26, 26') at its radially inner side, into which the radial annular edge (12), flanged at pipe end (10), is inserted. As a result, the annular edge (12) is prevented from getting caught in the opposite pipe end (10) and, at the same time, a firm fit of the flange ring (14) is guaranteed on the appropriate pipe end (10).

Abstract: A low thermal loss flexible connector stock material comprises a pair of metal strips, one edge of each of said strips being formed into clamping relation of margins of a pair of foam webs. When the strips are in overlapping relation the webs lie in face-to-face contact, the outermost web being deflected into spaced relation from the innermost web when the strips are folded into co-planar alignment, thereby defining a space between the webs.

Abstract: A band clamp for pipe joints is disclosed and comprises a band which has confronting end flanges when wrapped around the pipes. A clamping mechanism is provided for pulling the end flanges together and stretching the band around the pipes. The clamping mechanism includes a pair of force bars outboard of the end flanges and a spline with concave surfaces on opposite sides, the spline being disposed between the end flanges. A pair of bolts extend through bolts holes in the force bars, end flanges and spline and nuts thereon are tightened to draw the flanges against the spline and stretch the band around the pipes. Oversize bolt holes in the flanges allow the force bars to move translationally and angularly relative to the flanges. One force bar and the spline are held captive with one end flange by the bolts which extend therethrough into a press fit with the spline.

Abstract: The invention comprises an economical, adjustable duct section which allows an installer to mount and connect a curved end thereof to an opening in an air duct bend and to adjust the other end to a desired predetermined angle with respect to the horizontal. The invention makes it more feasible to install a second air handler on an outlet duct bend of a first air handler for augmenting an output of the first air handler on the roof of a building or the like. It provides an easily made water and weather tight seal between the assembled units.

Abstract: An improved duct is proposed which comprises a plurality of duct sections coupled together. Each duct section has a turned-up portion and a flange at one end and a flange at the other end. Both the turned-up portion and the flanges are formed by bending the edge of each duct section. The turned-up portion of one tubular body is inserted into the not-turned-up end of an adjacent tubular body. Bolt holes provided in each section are adapted to align with each other by themselves. Also, the inner edge the packing disposed between the flanges is covered up by the turned-up portion.

Abstract: This invention provides an improved adjustable tube clamping connector, especially one used for making adjustable connection of an inner tube and outer tube as required by the actual conditions. The outer tube has an open slot and is attached by welding to a clamp with two lugs on the slot. Fitted in the cavities of the lugs are a pair of clamping pieces each of which has a pair of extensions with curved surfaces. With the back of the clamp pieces against the bottom of the cavities of the lugs and the curved surfaces of the extensions on the external surface of the outer tube, they will give added strength and pressure to make the outer tube firmly grip and hold the inner tube so as to bear greater load and to ensure safe use.

Abstract: A pipe joint for thin-walled tubes (13, 14) is provided for transmission of water. The pipe joint includes a male portion (11) and a female portion (12) both of which having pressure cut threads (18, 21). At mounting thereof these portions (11, 12) are threadably engaged so that a seal ring (25) received in an annular extension (23) of the female portion (12) is brought into engagement with a conical portion (16) of said male portion (11) so as to provide tightening of said pipe joint.