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: A coupling and methods for interconnecting the ends of spirally ribbed pipe are disclosed. Grooves are formed transversely across two or more ribs of the pipe and a coupling ring is secured to the end of the pipe by lugs or cleats which rotatably engage with the grooves. Contact surfaces of the lugs are angled relative to the grooves to center the coupling ring axially of the pipe. The angular relationship of the grooves and contact surfaces of the lugs draw the ring into abutting contact with the end of the pipe as they rotatably engage the grooves.

Abstract: A tube joint for annular corrugated tubing includes a body having a sleeve for receiving the end of an annular corrugated tube; at least one circumferential raised lobe on the sleeve for engaging an annular corrugation of the tube; and a collar for engaging the body and including a swaging section having a first camming surface for compressing the lobe radially inwardly to engage a corrugation of the tube.

Abstract: A reducer seal assembly for providing a fluid-tight through-wall fitting. The seal includes a substantially rigid tubular supporting member having a flange extending radially about one edge. The flange and the interior of the supporting member are covered with resilient material. The supporting member is externally threaded so that a nut may be joined thereto. The resilient member coating the flange of the support member may be curved to conform to a convex wall surface. The resilient member extends beyond the supporting member for connection about a conduit extending through the wall. The assembly is connectable to a wall by first inserting the support member through a wall from the exterior side and then the nut is applied to the threaded portion of the support member to the extent that the resilient coating has compressed to form a fluid-tight seal between the coating and the exterior wall surface.

Abstract: Disclosed is a metal dryer exhaust duct assembly using a pair of flexible corrugated metal ducts capable of linear extension and capable of reorientation of the duct ends, a pair of elbow connectors, one for attachment to a dryer exhaust outlet and the other for attachment to a wall inlet. Each duct has a swivel connection to its respective elbow connector, using a sleeve which interfits with the elbow connector by a peripheral projection and recess arrangement. Each duct can also be interfit with another such duct. The two ducts can be attached respectively to an dryer and a wall spaced from each other, and are vertically self supporting, whereby when the dryer is moved adjacent the wall, a person can readily telescopically interconnect the ends of the ducts over the top of the dryer. One or more pieces of the duct may be used to span the distance between the dryer and the wall outlet.

Abstract: A coupling device for releasably connecting a corrugated member to the coupling device, has a radially outer housing, a radially inner operating sleeve and at least one locking claw forming part of the sleeve that is axially movable within the outer housing. The locking claw is accessible through an opening in the outer housing wall and its claw engages a corrugation ridge when a corrugated member is inserted into the operating sleeve. In the locked position a flange of the operating sleeve is axially spaced from the housing, whereby the claw rests against an edge of the opening and cannot be tilted radially outwardly about its hinge. In an unlockable position the flange of the sleeve contacts the housing and the claw can clear the opening edge to permit withdrawal of a corrugated member.

Abstract: A handle assembly for securing a vacuum hose to an intake nozzle of a vacuum cleaner system. A handle housing having first and second mating handle housing sections and a plurality of oppositely facing ridges and oppositely facing grooved portions protruding from inner surfaces of the housing sections is adapted to house a ribbed end portion of a vacuum hose and an elbow section having a shoulder portion protruding therefrom. The ridges and grooved portions are adapted to abuttingly engage the ribbed end portion of the vacuum hose and the shoulder portion of the elbow section respectively when the first and second handle housing sections are matingly engaged, to thereby prevent clockwise or counter-clockwise rotation of the vacuum hose as the handle assembly is articulated into various positions during use. The vacuum hose further includes a relatively smooth inner surface which is operable to slide over a portion of the elbow section housed within the handle assembly housing.

Abstract: A liquid tight connector for affixing, in a liquid tight manner, to a conduit having a ridge located adjacent to its end, wherein the conduit extends into a bore (5) and abuts against a sealing surface (6) and is held in liquid tight engagement therewith. A locking member (9) projects into the bore (5) and locks on to the ridge of the conduit.

Abstract: A fitting for externally grooved and ribbed end portions of pipes, tubes, hoses and like tubular bodies has a tubular section and one or more circumferentially extending prongs each having one end integral with but pivotable relative to the section and a free second end. The inner side of each prong has one or more one-piece or composite circumferentially extending protuberances. In order to couple the fitting to the end portion of a tubular body, the free end of each prong is pulled radially outwardly to extract the protuberance or protuberances from the interior of the tubular section. The end portion of a tubular body is thereupon inserted into the section, and the prong or prongs are released to introduce their protuberances into the adjacent external groove or grooves of the inserted end portion. Each prong is surrounded by a substantially U-shaped slot of the tubular section to permit slight axial movements of the free end portion of the respective prong.

Abstract: A pipe coupling for a corrugated pipe, comprises a pipe coupling main body including a cylindircal portion having a small-diameter through hole, a pipe coupling main cylindrical portion having a large-diameter through hole, a connecting stepped portion formed between the small- and large-diameter through holes and having a circumferential groove, a stopper formed in the connecting stepped portion, for locking an end portion of a corrugated pipe, and a seal ring fitted in the circumferential groove, an inner cylinder including a through hole having a diameter substantially equal to an outer diameter of the corrugated pipe and an annular groove having a tapered surface and formed in an inner wall of a deep portion of the through hole, the inner cylinder being slidably and rotatably fitted in the large-diameter through hole of the pipe coupling main body, and a metal ring arranged in the circumferential groove of the inner cylinder and expandable in a circumferential direction thereof.

Abstract: A coupling device which, as a coupler, provides the necessary strength for coupling deep trench installations of corrugated polyethylene drainage pipes without hanging up during feeding through a trenching tool and also allows the joining of the corrugated polyethylene pipes with various other standard pipe materials inclusive of acrylonitrile butadiene styrene and polyvinyl chloride, by the use of standard marketplace glues, solvents and adhesives. The two halves of the coupling device, when used as a coupler, are placed around two abutted ends of adjacent drainage pipe sections, allowing for three corrugations of each of the two corrugated drainage pipe sections to be surrounded and interlocked with radially inwardly projecting ribs of the coupling device. When used as a coupler, the coupling sections are held in place by a band or tape.

Abstract: A plastic pipe for sewer pipe reconstruction has at least one spigot, the outer diameter of which is smaller than the outer diameter of the pipe. It has furthermore a socket end the outer diameter of which is substantially equal to the outer diameter of the pipe. Its inner diameter is substantially equal to the outer diameter of the spigot. In order to construct such a pipe that, while having high crushing strength, it has low weight and insensitivity to damage in the outer area, and can be used for short-pipe relining, the pipe and the at least one spigot have annular protrusions. Furthermore, the outer diameter of the protrusions of the spigot corresponds substantially to the inner diameter of the socket end. The pipe is very rigid.

Abstract: A relatively resilient hose end telescoped over a relatively rigid tube end wherein a first axial zone of the tube end has an exterior rib with a circumferentially continuous radially outermost edge and a second axial zone of the tube end proximal to the first axial zone has circumferentially extending beveled exterior retention ribs, the hose end has a third axial zone which contains circumferentially extending beveled interior retention ribs complementary to those of the second axial zone, the exterior retention ribs and the interior retention ribs coact to resist axial separation of the hose end from the tube end with greater resistance than that encountered during telescoping of the hose end over the tube end, the hose end has a fourth axial zone proximal to the third axial zone and a fifth axial zone proximal to the fourth axial zone, the fourth axial zone has a nominal wall thickness less than those of the immediately contiguous portions of the third and fifth axial zones, and the fourth axial zone is s

Abstract: A system for joining first and second lengths of corrugated pipe together uses at least two notches cut into a first end of the pipe length. Each notch is formed by two cuts extending longitudinally for at least one corrugation. The cuts are spaced apart so as to form a tab that can be bent outwardly to expose the notch. The first and second ends are fitted together so that the second end is received by the notches, wherein the second end partially encompasses the first end and the first end partially encompasses the second end. The corrugations at the first and second ends matingly fit together. The tabs are bent inwardly to retain the second end to the first end.

Abstract: A method of joining tubes (A and B) having a corrugated wall (10) of fusible plastic material and terminating at a cut through a corrugation rib, comprises the following steps. An annular body (14) expanding when energy is supplied to it, is positioned in an annular space (13) formed by the corrugation ribs at the end of one tube (A) and an inner boundary which can be formed by an inner wall (11) of fusible plastic material, integral with the corrugated wall of said one tube, or by a sleeve inserted into the adjacent ends of the tubes, also of fusible material. The tube ends are put together to close said space by the end of the other tube (13), and a radial and axial support (19) for the corrugation ribs is arranged on the outside of the tubes. Then, the annular body is expanded by heating to fuse said body to the walls of the tubes and the sleeve, respectively.

Abstract: A connector for corrugated tubes comprises a lower shell (100) and an upper cover (150) having lateral walls (110, 160) with several corresponding semi-circular openings (50) that define, when the cover has been closed on the shell, circular openings for receiving corrugated tubes. The openings (50) are fitted with a series of flexible fingers (10) in the form of truncated segments of a circle that form flexible skirts in the form of a circular crown around the openings. Internal semi-circular ribs (40) for longitudinally locking the fitted corrugated tubes are situated on arcuate tongues (30) arranged in a plane parallel to the corresponding opening. Each tongue (30) is connected either to the inner wall by a flexible arm (29), or to the bottom of the shell by its lower middle part.

Abstract: A hose fixture device has a cylindrical wall with projections thereon, which projections engage a corresponding mounting projection of a hose. Normally that mounting projection is a helix, so that there is a screw engagement. The projections are arranged circumferentially around the cylindrical wall with gaps therebetween. There are also gripper members, again spaced circumferentially with gaps therebetween, which grip an end of the hose. The gaps make is easy to see such engagement. The gripper members are aligned with the gaps between those projections. This provides a secure fixing of the hose to the hose fixture device. Furthermore, the device may be moulded easily. Such a hose fixture device may be used to attache a hose joint component (e.g. a suction tool) to a hose of an electric vacuum cleaner.

Abstract: A connector fitting for a corrugated conduit comprises complementary first and second parts together defining a cylindrical body. They are molded in one piece with a strip which links the first and second parts together in the manner of a hinge. There is at least one rib on each part disposed in a plane perpendicular to the longitudinal axis of the part. At the free end of the first part opposite that adjoining the hinge is a first locking member. There is a complementary second locking member at the free end of the second part opposite that adjoining the hinge. A third locking member is provided on one edge of the first part adjoining the hinge and a complementary fourth locking member on an edge of the second part adjoining the hinge. The first locking member comprises a first bar and an outwardly facing first hook at the end of the first bar. The third locking member comprises a second bar and an outwardly facing second hook at the end of the second bar.

Abstract: Attachment means for connecting an insulated pipe to an element, such as the manifold, in the exhaust system of a vehicle. The attachment means includes a conduit which extends into the end of the insulated pipe. A transverse lug or a helical flange on the conduit engages the spiral corrugations of the inner diameter of the pipe to allow the conduit to be threaded into the pipe. The end of the pipe is received in an end cap slidably mounted on the conduit. When the cap hits a stop on the conduit during threading of the conduit into the pipe the lug or helical flange pulls the pipe against the cap, tightening the connection to the pipe.

Abstract: A connector for connecting to helically corrugated conduit which comprises a bolt member having a passageway therethrough and a connecotr body having a hollow end portion for receiving the bolt member, In addition, the connector includes a helical spring within the passageway which is adapted to be received within the helical corrugations of the conduit. The connector further includes a means for forcing the bolt member into the hollow end portion of the body of the connector to squeeze the spring between the bolt member and connector body whereby the spring is axially forced against the corrugations.

Abstract: A fitting connection for joining plastic tubing to associated structure comprises a main fitting body having an axially inwardly extending cylindrical chamber with an inner end portion of a diameter d.sub.1 terminating at its innermost end in a radially inward extending wall. The outer end of the chamber opens to the exterior of the body and has an open diameter d.sub.2 which is larger than d.sub.1 with a shoulder at the juncture between the inner and outer end portions of the chamber. Plastic tubing having a circumferential corrugation adjacent an end portion thereof extends axially into the chamber with the innermost end of the tubing abutting the wall. A retaining ring acts to retain the tubing in the fitting body and includes a sleeve received in the outer portion of the chamber with the innermost end of the sleeve in engagement with the shoulder and a plurality of resilient tabs having free ends extending toward the shoulder.

Abstract: In an annularly corrugated flexible plastic protective tube or conduit for receiving lines the longitudinal slit thereof is so widened that it is readily possible to insert the lines without interference. Clamped in fitting manner on the tube is an outer tube which also has a wide longitudinal slot and which covers the longitudinal slot of the first tube. The locking engagement of inner and outer tubes can be improved by corresponding complementary formation of the ribs or corrugations of the tubes. Branch pieces can be clamped onto the inner and outer tubes.

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 first, second and third substantially rigid conduit members. Engagement between conduit members is provided by a rib system on a narrow end of a conduit member being received within a broad end of a next adjacent conduit member. Sealing engagement occurs by an elastomeric seal member positioned between the ribs and an end of a conduit member within which the ribs are received. A preferred rib arrangement is provided, to insure a flexible, multi-point, seal system.

Abstract: A high pressure fuel hose for disposition between a tubular stem on a fluid connector on a canister in a fuel tank and tubular stem on a fluid connector on a cover for the fuel tank spaced from the canister. Each of the tubular stems has a fir-tree barb thereon and the high pressure hose includes a convoluted flexible body and a pair of relatively stiff cylindrical ends each of which has a pair of annular inside beads and three annular outside beads between the convoluted body and the inside beads. When the cylindrical ends are press fitted over the fir-tree barbs with force applied at the outside beads, the inside bead seat behind annular shoulders on the barbs for enhanced retention.

Abstract: Non-releasable, molded, large-diameter, corrugated plastic pipe having a wall structure made of high density polyethylene, PVC or polypropylene of sufficient thickness so as to be rigid but elastic and therefore relatively inflexible and having an integral automatically locking female coupling at one end and a cooperative male coupling at its opposite end, with access to its latching members at its exterior, and a method of manufacturing multiples thereof by a continuous molding process. The pipe has a corrugated wall structure. Only minor auxiliary cutting operations are required to separate portions thereof into individual plastic pipe sections, each having the automatic-locking coupling at one of its ends and a male portion at its other end. The coupling is supported on the corrugated pipe by a frusto-conically shaped collar which functions as a guide for proper alignment as two sections of such pipe are united into latched relation.

Abstract: A sealing ring made of an elastomeric readily flowable incompressible material utilized for perfecting a seal between the interior surface of a coupling sleeve and the crest of a rib of a section of corrugated plastic pipe, the sealing ring having a generally flat annular body which in its free form has its major cross-sectional series of axially extending ribs, one of which is located on the inner diametrical surface of the ring for securing the ring within the valley between adjacent ribs on the corrugated pipe, a second rib located on the outer circumferential surface of the ring for primarily sealing between the coupling sleeve and the proximal area of the crest of a rib of the corrugated pipe against infiltration of external fluids and solids, and an intermediate rib for primarily sealing between the coupling sleeve and the distal area of the crest of a rib of the corrugated pipe against the escape of fluids and solids flowing therethrough.

Abstract: An elongated flexible metal channel is adapted to surround a pair of engaging overlapped inner and outer cylindrical member with opposite ends of the channel overlapping one another to provide an adjustable clamp for the cylindrical members. Spaced opposed looped anchor strips overlay the respective ends and adjacent intermediate portions of the channel. Each anchor strip, which is secured to the adjacent intermediate portion, loosely engages one channel end. Adjustable fasteners interconnect the anchor strips to variably draw up the intermediate portions while extending the overlap of the channel ends.

Abstract: A liquid tight container for affixing, in a liquid tight manner, to a conduit having a ridge located adjacent to its end, wherein the conduit extends into a bore (5) and abuts against a sealing surface (6) and is held in liquid tight engagement therewith. A locking member (9) projects into the bore (5) and locks on to the ridge of the conduit.

Abstract: A connection fitting for a corrugated tube includes a cylindrical housing, a bow-shaped locking element attached to the housing by a hinge portion and a corrugated tube for insertion into the housing. The cylindrical housing has two openings and a wall element between them for receiving a bow-shaped locking element provided with two pairs of ribs on its inner surface corresponding to the openings. When inserting the corrugated tube into the cylindrical housing, the corrugated tube is fixed firmly to the cylindrical housing by the ribs on the locking element engaging with the groove portions of the corrugated tube through the openings.

Abstract: A pipe connecting element serves to connect pipes, which consist essentially of a continuous inner pipe and connected with it, extending radially outwards, projections, which serve to stiffen the pipe. To make such a pipe connecting element suitable to the light construction concept of double walled pipes or corrugated pipes on the one hand and achieve high load capacity in the direction of the pipe axis and good hydraulic properties on the other, the pipe connecting element consists of connected with each other sections, which are constructed by a core pipe and a jacket pipe. Adjacent sections are connected on their butt joint surfaces in such a manner that the core pipes and the jacket pipes each of these adjacent sections are connected with each other. Additionally, the core pipe and the jacket pipe of each section are firmly connected with each other.

Abstract: Non-releasable, double-walled, molded, large-diameter, corrugated plastic pipe having walls made of high density polyethylene, PVC or polypropylene of sufficient thickness so as to be rigid but elastic and therefore relatively inflexible and having an integral automatically locking female coupling at one end, with access to its latching members at its exterior, and a method of manufacturing multiplex thereof by a continuous molding process. The pipe has a smooth interior wall and a corrugated outer wall integral therewith. Only minor auxiliary cutting operations are required to separate portions thereof into individual plastic pipe sections, each having the automatic-locking coupling at one of its ends. The coupling is supported on the corrugated pipe by a frustoconically shaped collar which functions as a guide for proper alignment as two sections of pipe are united into latched relation.

Abstract: An improved connecting arrangement (10) by which to secure one end of a drain conduit (12) to the stub conduit (13) of a drain port (14). A unique coupler (11) is interposed between one end of the drain conduit (12) and the port (14). The coupler (11) has an annular sleeve portion (20) and an annular fitting portion (21) that are joined by a generally annular transitional portion (24) which is interposed between the sleeve and fitting portions (20 and 21, respectively). The hollow interior (22) of the sleeve portion is provided with threads (25), and an annular sealing recess (26), which opens toward the interior of the sleeve portion (20), is presented from the interior of the transitional portion (24). A novel drain conduit (12) interconnects with the coupler (11). The drain conduit (12) is provided in substantially continuous lengths and has a body portion (15) with a plurality of threaded portions (16 ) provided at longitudinally spaced locations along the body portion (15).

Abstract: A fluid coupling for a corrugated pipe, comprising a coupling body having an axial through hole including a pipe insertion portion and a fluid passage portion, metallic seal means arranged on the fluid passage side of the pipe insertion portion, for sealing an end portion of a corrugated pipe pressed against the same, clamp means having at least three segments arranged in the circumferential direction and adapted to tightly hold the peripheral portion of the corrugated pipe inserted in the insertion portion, and retaining means for axially and immovably retaining the clamp means so that the end portion of the corrugated pipe is pressed against the seal means, to be sealed thereby.

Abstract: A fluid coupling for a corrugated pipe, comprising a coupling body having an axial through hole and a cylindrical outer peripheral surface, metallic seal means arranged at a pipe insertion portion of the axial through hole, for sealing an end portion of a corrugated pipe, a first sleeve having a first end portion, slidably mounted on the outer peripheral surface of the coupling body and urged axially outward, ring-shaped engaging members adjoining the first end portion of the sleeve and reducible in diameter, and retaining means surrounding the sleeve and the engaging members so as to be movable relative to the coupling body and the sleeve, the retaining means being adapted to reduce the diameter of the engaging members so that the engaging members are forced into root portions of the corrugated pipe, whereby the engaging members are held in a predetermined axial position.

Abstract: A connection fitting for a corrugated tube has a cylindrical housing for receiving the corrugated tube and a U-shaped locking element for fixing the corrugated tube firmly to the cylindrical housing. The cylindrical housing is provided with a sunken portion on the side surface and slits running circumferentially at a bottom of the sunken portion. The locking element has ribs projecting on its inner surface which penetrate into the slit and engage with the grooves of the corrugated tube. The engaging members are formed on both sides of the sunken portion of the cylindrical housing. Corresponding hook-like elements are formed at both ends of the locking element.

Abstract: A fluid coupling comprising a coupling body having a cylindrical outer peripheral surface, clamp means for radially and inwardly clamping the outer peripheral surface of an end portion of a pipe, the clamp means beig axially immovable with respect to the pipe, a sleeve having engaging means and slidably fitted on the cylindrical outer peripheral surface of the coupling body, the engaging means being capable of axially moving the clamp means, a spiral guide groove formed on one of the sleeve and the outer peripheral surface of the coupling body, a pin member formed on the other of the sleeve and the outer peripheral surface of the coupling body and slidable along the guide groove, and means for preventing the sleeve and the coupling body from rotating relative to each other at a position reached when the sleeve is moved axially a predetermined distance, as the pin member is guided along the guide groove.

Abstract: A fluid coupling for a corrugated pipe, comprising a coupling body having a large-diameter portion and a small-diameter portion through which the corrugated pipe can be passed, metallic seal means arranged at the small-diameter portion, for sealing an end portion of a corrugated pipe pressed against the same, a ring-shaped engaging member disposed in the large-diameter portion and having its inside diameter reducible to a size smaller than the diameter of the top of corrugation of the corrugated pipe, and retaining means having an outside diameter small enough to be inserted into the small-diameter portion, an inside diameter large enough to be penetrated by the corrugated pipe, and a first end portion capable of engaging the engaging member, the retaining means being adapted to press the end portion of the corrugated pipe against the seal means, while transferring the elastic member from the large-diameter portion to the small-diameter portion, thereby holding the engaging member in a predetermined axial pos

Abstract: A clamp-type corrugated plastic pipe coupling of the invention, which is clamped with a split mold having flanges, includes an outer coupling member having a corrugation at least on its inner surface and a packing member arranged inside the outer coupling member. The packing member has an inner surface with a corrugation substantially identical to the corrugations on outer surfaces of corruated plastic pipes to be connected. The packing member is made of a material having a rubber hardness of not more than 25 and a compression set of not more than 60%. The corrugated plastic pipe coupling having the above structure has watertightness which can sufficiently withstand a water pressure of 5 kg/cm.sup.2 or more even when it is subjected to heat cycles between -25.degree. and 80.degree. C.

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: Flexible convoluted tubing is made of an elastomeric material in desired lengths in which one end has convolutions with a configuration different from the convolutions at the other end. This enables the ends of each length to be interlocked in order to form a continuous closed hose. Alternatively separate lengths of tubing can be joined by interlocking one end of each length of tubing to the dissimilar end of another length of tubing.

Abstract: A strain relief clamp for a washing machine drain hose which includes a pair of hinged clamp members each having a plastic plate with a semi-circular indent adapted for receiving a corrugated drain hose from opposite sides thereby completely surrounding and clamping the drain hose. Each clamp member has a wall which is perpendicular to the plate, which wall members cooperatively form a neck which conforms to the shape of the aperture through which the drain hose exits the washer cabinet. Each wall has a plurality of locking tabs such that when the neck is inserted into the aperture until the plates contact the cabinet panel, the locking tabs snap into place and prevent removal of the strain relief clamp. The hose is thereby securely clamped at its exit through the cabinet panel thereby providing strain relief for the interconnection between the drain hose and the pump.

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 first, second and third substantially rigid conduit members. Engagement between conduit members is provided by means of a rib system on a narrow end of a conduit member being received within a broad end of a next adjacent conduit member. Sealing engagement occurs by means of an elastomeric seal member positioned between the ribs and an end of a conduit member within which the ribs are received. A preferred rib arrangement is provided, to insure a flexible, multi-point, seal system.

Abstract: The non-profiled end portions of two pipes can be coupled to each other by a ring-shaped band which has at least one axially parallel gap and circumferentially extending corrugations defining two outer chambers and at least one median chamber. Each chamber is open toward the peripheries of the pipes and each outer chamber surrounds a different pipe. Such outer chambers contain arcuate safety devices with radially innermost portions in the form of claws serving to penetrate into the material of the respective pipes when the band is tightened around the end portions of the pipes by a clamping unit which is designed to reduce the width of the gap. The median chamber of the band confines a deformable annular insert which has marginal sealing lips and serves to establish a seal between the internal surface of the band and the peripheral surfaces of end portions of the pipes when the clamping unit is actuated to reduce the diameter of the band.

Abstract: The conduit system includes a connector fitting joining adjacent ends of a pair of the corrugated plastic conduits in end-to-end relationship, a junction box inlet connector joining one end portion of the corrugated plastic conduit in an opening in one wall of a junction box, and a switch box inlet fitting joining one end portion of the corrugated plastic conduit in an inlet opening in one wall of a switch box. Both the connector fitting and the switch box inlet fitting include a pair of hingedly connected semicircular clamping elements each including integrally molded rib members and including locking means on the opposite side from the hinge member with both the locking means and the hinge member being embedded in opposite sides of the clamping elements so that they do not extend outwardly from opposite sides thereof. Both ends of the connector fitting are identical while one end of the switch box inlet fitting has concentric interior and exterior surfaces for adhesively securing the same in the switch box.

Abstract: A thin flexible metal tube comprising two flexible bendable portions having low corrugations and a straight flexible portion having higher corrugations easy to absorb vibrations and disposed between both the bendable portions.

Abstract: A duct joining system for sealingly connecting plastic gas-conveying ducts is provided. The joining system comprises a receptacle attached to an end of a first duct and sealingly fastened thereto. The receptacle has a size and configuration which is adapted to mate with an end of a second duct. The second duct has a grippable surface extending along its length. The interior of the receptacle contains releasable gripping means and a sealing gasket. The gripping means engages with the surface of the second duct in order to urge the end of the second duct into sealing contact with the gasket.

Abstract: A pipe joint includes a joint body having an internal thread portion formed in the interior thereof, a bush having formed on the outer periphery thereof an external thread portion helically meshed with the internal thread portion of the joint body, a gasket accommodated within the interior of the joint body, and a retainer having formed on one end thereof on the side of the joint body a flange of increased wall thickness which is pushed toward the joint body by the end face of the external thread portion of the bush. The flange of the retainer may be provided with at least one engaging projection extending radially outwardly from the outer periphery thereof and, in this case, the internal thread portion of the joint body is provided therein with at least one lock portion which is engaged with the at least one engaging projection of the flange.

Abstract: A blower comprises a unit blower housing of molded plastic material having a circular outer wall and laterally spaced front and rear walls, defining an impeller chamber and a tangential outlet upon a first axis adapted to receive a flexible hose. The outlet defines with an end portion of the outer wall a reverse curved cut off edge extending between the side walls. An opening in the front wall is arranged upon a second axis at right angles to the first axis and receives an air inlet cone secured to the housing by a plurality of threaded inserts molded into the housing. An electric motor upon a support has a drive shaft extending through the rear wall. The rear wall is mounted upon and secured to the motor and an impeller is positioned within the housing and axially mounted upon the motor shaft and has an air intake receiving the air inlet cone.

Abstract: A system for venting exhaust fumes from vehicle engines being operated in enclosed spaces, such as in residential garages. The system provides for conveying the gases from the vehicle exhaust pipe through an opening formed in the garage door or the like. The equipment includes a door port mounted in the garage door opening and which defines a passage with a cylindrical interior surface extending through the door. An exterior closure plate is pivotally mounted on the outside of the door port to swing between a closed vertical position covering the passage and an upward, horizontal, open position. The interior surface of the sleeve has an inwardly projecting radial rib that defines an arcuate portion of an internal helical thread. The exhaust fumes are conveyed from the exhaust pipe to the door passage by flexible tubing formed with helical corrugations that define an external helical thread.

Abstract: An inexpensive and easy to use coupling for connecting one end of a corrugated flexible hose to a meter or distributor outlet, or to another hose on an implement such as an air drill or seeder. Two generally semi-cylindrical portions are molded as a single unit with integral hinge and locking structure. The inner surface of the cylindrical member is corrugated to correspond to the corrugations on the flexible hose, and an end portion of the coupling device includes an annular groove which mates with a flange on the outlet. The locking structure automatically latches as the semi-cylindrical portions are closed around the hose and the flange.