Abstract: A protection device for protecting a cylindrical structure has a pair of sections. The pair of sections when assembled form a tube. Each of the sections has inclined opposing mating surfaces. The sections have interlocking structures to resist longitudinal and transverse movement of the two sections with respect to one another.

Abstract: A thermal insulation system for insulating a pipe is disclosed having an upper insulation member engageable with a lower insulation member to collectively surround the pipe. Each of the upper and lower insulation members preferably have a plurality of constant radius relief cuts at each end thereof, wherein the constant radius relief cuts extend from the end of each of the insulation members toward the center of the insulation member. In a preferred embodiment, each insulation member further includes a plurality of radial relief cuts extending radially from the inner surface of each of the insulation members toward the outer surface of the insulation member. The radii of curvature of the insulation members is preferably variable such that, for a portion of the insulation member, a gap exists between the inner surface of the insulation member and the pipe, allowing room for fluctuation in the size and shape of the insulation members.

Abstract: A conduit pipe is installed within a cable tunnel and telecommunication cables are disposed in the conduit pipe. The conduit pipe is divided longitudinally into a plurality of divided bodies. Each divided body is equipped at one longitudinal side with a retaining part and at the other longitudinal side with a protruded part. A single conduit pipe is formed when the divided bodies are connected to each other along the longitudinal side. Since the divided bodies can be wound around a small-diameter bobbin to be carried, the space for their custody is reduced and the carriage thereof is easier. Further, since connection parts on surfaces of the conduit pipes can be arranged such that they occupy empty spaces between conduit pipes, the space occupied by the connection parts can be minimized, thereby comparatively larger number of telecommunication cables being able to be disposed within the cable tunnel.

Abstract: A conduit pipe is installed within a cable tunnel and telecommunication cables are disposed in the conduit pipe. The conduit pipe is divided longitudinally into a plurality of divided bodies. Each divided body is equipped at one longitudinal side with a retaining part and at the other longitudinal side with a protruded part. A single conduit pipe is formed when the divided bodies are connected to each other along the longitudinal side. Since the divided bodies can be wound around a small-diameter bobbin to be carried, the space for their custody is reduced and the carriage thereof is easier. Further, since connection parts on surfaces of the conduit pipes can be arranged such that they occupy empty spaces between conduit pipes, the space occupied by the connection parts can be minimized, thereby comparatively larger number of telecommunication cables being able to be disposed within the cable tunnel.

Abstract: An adjustable jacket and method of covering an insulated conduit, the jacket having two parts which together form a cylindrical configuration over the insulated conduit. Overlapping flanges of the two parts equipped with grooves and ridges allow tightening of the two parts so that the jacket conforms to the underlying conduit having bends and curves.

Abstract: An adjustable jacket and method of covering an insulated conduit, the jacket having two parts which together form a cylindrical configuration over the insulated conduit. Overlapping flanges of the two parts equipped with grooves and ridges allow tightening of the two parts so that the jacket conforms to the underlying conduit having bends and curves.

Abstract: An adjustable jacket and method of covering an insulated conduit, the jacket having two parts which together form a cylindrical configuration over the insulated conduit. Overlapping flanges of the two parts equipped with grooves and ridges allow tightening of the two parts so that the jacket conforms to the underlying conduit having bends and curves.

Abstract: The showerhead security cover prevents unauthorized access to a connector of a shower assembly. The connector secures the showerhead to the shower arm, the connector, showerhead, and shower arm being standard without any modification required. The showerhead security cover comprises a housing and a lock. The lock is integral with the housing. Once the lock is engaged, the housing encases the connector and prevents access to the connector. Once the lock is engaged, there is no substantial rotational movement of the connector relative to the shower arm. One end wall of the housing seats against an end of the connector during engagement preventing any substantial axial movement of the connector relative to the connector. The housing is strong enough to prevent engagement with the connector even when the housing is grasped with pliers. Disengagement is enabled by the use of a special tool to allow authorized access to the connector.

Abstract: A downspout for use with a rain gutter is formed from an elongate member constructed substantially entirely of plastic material. During shipping and storage, the elongate member is maintained in a generally planar configuration that can be coiled on a mandrel. To produce a downspout, a predetermined length of the elongate member is withdrawn from the coil and cut. The elongate member is then configured into a tubular form having a predetermined geometric cross-section, such as a rectangular or oval cross section. Lateral sides of the elongate member define respective connectors that are interlocked to maintain the tubular form.

Abstract: A plastic form having two or more sections and a hinged joint therebetween can be folded about the hinged joint and joined together by fastening devices to form a plastic duct connector for heating, ventilation and air conditioning systems.

Abstract: A modular conduit system comprises elongate conduit elements (50, 51) and conduit fitting elements (30, 37) longitudinally divided and provided with tongue and groove joints configured such that identical conduit halves or identical conduit fitting halves can be snap fitted together and released interengaged by radially directed resilient restoration forces in the fitting elements. The interengageable tongue (1a) formation and corresponding groove formation (2b) each have at least one radial curvature with the same radial origin when opposing elements are interengaged.

Abstract: An expandable repair fitting for sealing and reinforcing polyethylene pipe includes a single or multiple middle section(s) that receives two end sections. The three sections are split into halves in order for the fitting to encapsulate the entire pipe to be repaired. Electrical heating elements in the form of wires are embedded within each section. The specific location of the wires causes the jointed halves to melt together when an electrical source is supplied to the wires, as well as causing a portion of each end piece to melt about the outer pipe diameter, thereby forming a sealed repair fitting. A portal is provided on the middle section to allow pressure testing of the integrity of the fitting. In a second embodiment, the repair fitting does not encapsulate the entire pipe circumference.

Abstract: An insulated air duct apparatus including insulated duct modules and associated insulated fitting apparatus for transferring a volume of fluid in a warm air heating and air conditioning installation without employing external insulation or structural support members, otherwise required to support and insulate duct apparatus including a plurality of lightweight duct modules in combination with take-off connectors for joining such modules, each duct module comprising duct walls joined by corner members wherein said duct walls and take-off connectors comprise rigid fibrous glass (RFGB) with reinforced facing having inherent structural strength such that each duct module is self supporting.

Abstract: Each raceway stretch includes a base section, external walls; one or more compartment walls providing for the existence of sub-raceways, folds capping the walls and forming longitudinal slots and a cover section for each sub-raceway. The internal bottom surfaces of each base section are coplanar and have juxtaposable end cuts over the whole extension thereof. The elbow includes for each sub-raceway, an angled closing member having skirts engageable simultaneously in longitudinal slots of both raceway stretches, closing portions of a sub-raceway of each stretch; and a covering member which, in said active position, covers said angled closing members from above and is provided with means for engagement with said base sections.

Abstract: A heat exchanger has plural tubes and a header tank formed by a first tank portion and a second tank portion. When the first tank portion and the second tank portion are assembled, a protruding portion protruding from a wall of the first tank portion is inserted into a hole formed in the second tank portion. Then, the first tank portion is slidably moved against the second tank portion in a parallel direction with respect to a longitudinal direction of the header tank until the protruding portion engages the hole. As a result, the second tank portion is partially clamped between the wall of the first tank portion and the protruding portion, and the first and second tank portions sufficiently contact each other. Therefore, undesirable clearance is restricted from being formed between the first and second tank portions, and brazing performance therebetween is improved.

Abstract: The invention relates to a corrugated pipe which, in accordance with the invention includes an engagement structure formed perpendicular to the longitudinal extent of the corrugated pipe, whereby the engagement structure includes a portion dimensioned in circumferential direction of the corrugated pipe which is further radially spaced from the inner diameter of the pipe.

Abstract: The device, in the active position thereof, provides for a connection between stretches of raceway, each of which includes: a base section with external walls and internal walls, providing for the existence of at least two sub-raceways, and a cover section. The internal surfaces of the bottom walls form between them a dihedral. For each sub-raceway, the device also includes a dihedral closing member, each provided with two end portions which, in the active position of the device, are respectively parallel to the internal surfaces of the bottom walls. Fixedly attached channel-like members project longitudinally from said end portions for connection to the walls of the base sections; and a covering member adapted to cover the closing members at least in part.

Abstract: A corrugated tube has alternating ridge and trough shapes, viewed in longitudinal cross-section. The tube also has a slit along its longitudinal direction, thereby forming first and second portions flanking the slit. The first and second zones comprise a first and a second end portion of the ridge shapes, respectively. The first end portion forms a convex portion, while the second end portion forms a sequential convex and concave portion. Each portion extends from the slit side around the opposing circumferential directions, thereby forming female and male locking portions, respectively. When the male locking portions are inserted under the female locking portions, the convex portion of the first zone and the sequential convex and concave portion of the second zone are stacked and the slit is firmly locked.

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: A corrugated tube with a longitudinal slit is loaded with electrical wires and the slit is locked. This process is effected using one device and in a single step. The corrugated tube is provided on its outer surface with circular peaks and troughs alternating along the axial direction. The portions facing one another across the slit are provided with convex and concave shapes along the circumference of the tube forming female and male locking portions. The male locking portion is inserted under the female locking portion, so as to lock the slit. An automatic locking device has a tubular guiding unit having a slanted tube part, and a tubular locking unit. The wires pass through the slanted tube part and the tubular locking unit. The tubular guiding unit is inserted into the slit, and the corrugated tube inside the tubular locking unit.

Abstract: In a electric cable conduit provided with one or opposite locking device(s) (10-10.3) for connecting a lid clamp (2, 2.1) with one or both side walls (4-4.4, 5-5.4) of the cable channel (1, 1.1), the lid clamp (2, 2.1) has at least one wing (7-7.4) which is connected with a second wing (8-8.4) or an intermediate member (6) by a flexible hinge (9.1, 9.

Abstract: A cable management apparatus includes a cable trough having a body portion. A first side wall portion and a second wall portion each extend along a length of the body portion. The first side wall portion includes a plurality of notches formed therein and spaced along a length of the first side wall portion. A flange portion extends from each of the side wall portions. Each of the flange portions includes a plurality of openings formed therein. An elongated cover includes a plurality of fastening members spaced along a length of the cover. The fastening members are received in the flange openings to fasten the cover to the cable trough and to enclose cables routed within the cable trough while allowing cables to pass through the notches formed in the first side wall portion.

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: In a pipe in which a plate material is formed into a cylindrical shape, and a one-side edge portion and the other-side edge portion are joined to each other to thereby form a pipe body, a fitting convex portion is integrally formed on the one-side edge portion of the pipe body, and a fitting concave portion is integrally formed in the other-side edge portion so that the fitting convex portion is fitted into the fitting concave portion. Further, a top end portion of the fitting concave portion is bent and received in a recess portion formed in the pipe body.

Abstract: A housing for receiving individual components of a heating or cooling installation is formed of at least two shells of thermally insulating plastic which enclose the components between themselves. The shells are provided at their respective facing edges with a rabbet connection formed of a rabbet strip and a groove strip corresponding thereto in shape and dimensions. The flank of the groove strip of the bottom shell which cooperates with the rabbet strip is divided into an upper partial surface inclined relative to the rabbet strip at an angle .alpha. to the normal line and a lower partial surface which is inclined at an angle .beta. to the normal line. The angles .alpha. and .beta. have opposite rotational directions. The rabbet strip of the top shell has surfaces corresponding to the surfaces of the groove strip so as to substantially facilitate closing and opening of the housing.

Abstract: The pipe spacer washer according to the invention includes a radially split annular element defined by three mutually hinged sector elements; and a snap-on fastening device defined by a tooth and a seat for insertion of the tooth, located at opposite substantially facing circumferential ends of the annular element, and for integrally connecting the circumferential ends to define an inner ring housing the pipe and connected in one piece to an outer supporting ring by a number of radial ribs. The washer is made entirely of a single material of a Shore A hardness of more than 80, in particular xantoprene.RTM.; the retaining tooth is in the form of an asymmetrical arrow, and has an inner axially through cavity elongated circumferentially; and the seat for receiving the retaining tooth is closed partially on both sides by two lateral braces offset circumferentially.

Abstract: A drainage pipe for use with a basement waterproofing and drainage system includes a U-shaped lower section, the lower section having a base, first and second side portions, the first and second side portions angling away from a line perpendicular to the base and outward and away from the base. The edges of the upper section are folded over and downward to receive and hold the side portions of the lower section. A substantially L-shaped cover plate is bent upwards at an angle of about 90 degrees and has attaching means for attaching the second section to a basement wall.

Abstract: The present invention relates to a refractory shield for protecting a superheater tube against fluid attack comprising first and second partial-tubes, each partial-tube having a C-shaped cross-section, the C-shaped cross section defining first and second ends; wherein the ends of the partial-tubes are opposably engaged, and wherein the partial-tubes comprise means for preventing radial movement of the first partial-tube relative to the second partial-tube.

Abstract: A locking structure including a case having a bottom plate and a pair of side walls extending upward from both side edges of the bottom plate. The locking structure further includes a cover for closing the opening defined between the top ends of the pair of side walls, stopping projections provided on each side wall of the case, and engaging frames each of which is formed at each side end of the cover and has a window to be engaged with each stopping projection. A portion near the opening of each engaging frame and a portion near the opening of each stopping projection facing that engaging frame defining a space therebetween.

Abstract: A conduit assembly which has an inner sleeve and outer sleeve which are proportioned to be concentrically mounted, each of which has a longitudinal slot of approximately the same width is disclosed. The conduits are circular, and a detent is provided on the larger of the conduits to accept and nestingly receive the slot of the smaller conduit when the same is rotated to form a complete circular encasement of the wires or cables which are passed through the conduits. The method of the invention contemplates the steps of forming a hole through a wall, such as a firewall, thereafter, optionally, passing the wires through, or passing the inner and outer sleeve through, and then once the wires are in place, or in anticipation of the wires being inserted, rotating the inner sleeve within the outer sleeve until the sleeve slots are approximately diametrically opposed and the central sleeve slop is secured in the detent.

Abstract: A duct fitting for joining a plurality of duct sections of a wiring duct network comprising a fitting base and a fitting cover having corresponding tabs and slots for providing a simple assembly operation for fixing the cover to the base. The fitting base has tabs formed on the marginal edges of its sidewalls which cooperate with slots formed on flanges of the cover. The sidewalls of the base are flexed inwardly and then released to engage the tabs with the slots of the cover.

Abstract: A slipliner for renovating a semi-elliptical conduit such as a masonry sewer line. The bottom of a semi-rigid cylindrical liner pipe is split longitudinally and a floor panel is mounted across the bottom of the pipe to spread the edges of the cut. This bends the lower side walls of the pipe outwardly so that these correspond to the generally vertical side walls of the conduit, while the upper portion of the pipe remains generally cylindrical so as to correspond to the top wall of the conduit and the floor panel corresponds to the generally horizontal bottom wall of the conduit. The slipliner of the present invention is thus much more closely matched in shape to the semi-elliptical conduit than would be a conventional, cylindrical liner.

Abstract: A pipe repair coupling comprising a pair of semi-circular separate and independent coupling segments. Each segment is identical in cross section, length, and width. When coupled together along one elongated edge in a snap fit relationship, the interconnected segments may be placed about a cylindrical pipe to repair a hole or the like therein, then squeezed together to lock along the other free elongated edges thereof. A suitable adhesive is applied between the coupling and the pipe being repaired prior to squeezing the segments together.

Abstract: A method of manufacturing a protective sheath made of laminated material based on fibers impregnated with resin, the method making use of a cylindrical draping mandrel, wherein:at least two longitudinal elements are provided on the mandrel to project from the periphery thereof, which elements are disposed substantially along diametrically opposite generator lines of the mandrel, dividing the mandrel into two longitudinal semicylindrical portions;a first sheet of flexible laminated material is placed on one of the semicylindrical portions of the mandrel, with the longitudinal margins of the sheet overlying the longitudinal elements;a second sheet of flexible laminated material is placed on the other semicylindrical portion, with the longitudinal margins thereof overlying the longitudinal margins of the first sheet and the projecting longitudinal elements;the first and second sheets are pressed against the outside surfaces of the semicylindrical portions by means of a pressure difference;both sheets are hardene

Abstract: A system of tubes and connector blocks to contain electrical, telephone and television cables. The tubes and the blocks are divided by walls which create separated cavities to contain the cables.

Abstract: The present invention relates to a system of adjustable preformed ductwork for the conveyance of a fluid. The system uses a distribution box which includes an upper portion having a plurality of walls and a bottom plate. The distribution box may act either as a diffuser boot or as a splitter box. The distribution box is joined to interconnecting duct lines by adaptor conduits. The adaptor conduits are duct line which are adapted at one end for connection to an opening in a wall and are adapted at the other end for connection to adjoining duct line. A valve having a housing, a first cone and a second cone is also included in the system either in a duct line or in an adaptor conduit. The first and the second cone have matching apertures. The second cone is rotatable within the first cone such that the matching apertures may be selectively aligned or misaligned to adjust the flow of the fluid through the ductwork system.

Abstract: An enclosure for housing a cable, the enclosure having a removable cover and, when removed, an opening is defined into the interior of the enclosure. Flanges extend inwardly of the enclosure and are located at the opening. The flanges are supported in recesses in the walls defining the enclosure and the flanges, in turn, include recesses in which fasteners for releasably securing the cover to the enclosure are supported. The connecting flanges of the predominant walls which are used in connecting multiple wall sections to form the enclosure are turned inwardly.

Abstract: A wiring duct comprising a base and a cover for providing an opening therebetween for receipt of wires and the like. The base has a pair of sides with their free ends terminating in an arrowhead configuration. The cover is provided with a pair of arms on each side for snapping over the arrowhead to provide a positive latch therewith. The inside arm on each side of the cover is angled away from its respective outside arm to engage the leading edge of the arrowhead and provide for firm engagement with the arrowhead notwithstanding the typical range of tolerances associated with manufacturing products of this type.

Abstract: An underfloor duct designed to be imbedded in a concrete floor is constructed from first and second duct partial sections which are held together by an interlocking structure integrally formed from the sheet metal of the duct partial sections. In a preferred form the duct partial sections are duct half sections substantially identically formed from sheet metal. In another preferred form, the duct partial sections define flanges extending outwardly at an intermediate level along the sides of a rectangular cross section duct, whereby the duct may be supported from the flanges. Also, multiple cell duct configurations are disclosed.

Abstract: A transition duct assembly for a dryer air handling system, connecting a lint duct assembly to a blower housing includes two duct pieces assembled together with locking tabs and a tongue and groove arrangement at the longitudinal seams of the two duct pieces, a sealing ring and spring clip at the transition duct assembly/blower housing interface, and a simple one screw attachment arrangement at the transition duct assembly/lint duct assembly interface. The transition duct assembly provides an air sealed assembly which is accessible to assemble and disassemble from behind the front panels of the appliance, prevents sound and vibration transmission through the transition duct assembly, and minimizes hand tool work to assemble or disassemble the transition duct and the air handling system.

Abstract: A semi-rigid tree protector positionable about a circumference of a base of a tree, the base of the tree having a circumferential outer surface. The tree protector comprises a corrugated band mechanism for encircling the circumference of the base of the tree. The corrugated band mechanism includes a series of alternating ridges and grooves extending substantially vertically of the base of the tree when the band mechanism is positioned therearound. The band mechanism being made of materials which are sufficiently flexible and resilient to permit the band mechanism to be bent around the tree. Preferably, the grooves are reciprocated by vertically extending surfaces. Preferably, the band mechanism includes first and second ends, and a coupling mechanism for coupling the first and second ends together around the base of the tree. Methods of protecting the base of a tree from the impact of lawn care equipment and from plant eating pests and animals are also provided.

Abstract: A pipe fitting for encompassing a conduit comprising a pair of interlocking segments with each segment comprising an arcuate configuration having at least two longitudinal edges with one edge of each segment comprising a tongue split longitudinally thereof in a direction substantially perpendicular to its length. The other of the edges comprising a groove conforming to and receiving the tongue formed on the juxtapositioned edge of the other of the segments. The tongue when forced into the opening in the groove in the other of the segments causing its two parts to engage each other along the length of the slot and when in the groove to again separate causing the tongue to interlock with the periphery of the groove thereby interlocking the segments of the pipe fitting together.

Abstract: A transition duct assembly for a dryer air handling system, connecting a lint duct assembly to a blower housing includes two duct pieces assembled together with locking tabs and a tongue and groove arrangement at the longitudinal seams of the two duct pieces, a sealing ring and spring clip at the transition duct assembly/blower housing interface, and a simple one screw attachment arrangement at the transition duct assembly/lint duct assembly interface. The transition duct assembly provides an air sealed assembly which is accessible to assemble and disassemble from behind the front panels of the appliance, prevents sound and vibration transmission through the transition duct assembly, and minimizes hand tool work to assemble or disassemble the transition duct and the air handling system.

Abstract: A secondary confinement pipe is assembled from identical segments of extruded polyvinylchloride with tenon and groove formations along longitudinal edges enabling the segments to be interfitted. The joints are sealed by flexible synthetic resin coextruded with one of the formations at respective edges.

Abstract: A locking mechanism has an engagement hole formed in each side portion of a lid, an engagement projection formed on each side wall of a body for engagement with a corresponding engagement hole, holding plates disposed on a lid portion so as to hold the corresponding engagement projections toward the engagement holes in the adjacent side portions, and projections projecting from the edge surfaces of the respective side walls for engagement with corresponding holes formed in the lid portion. If a force acting to open the lid is externally applied, forces acting to press the engagement projections toward the corresponding engagement holes act upon the edge portions of the respective projections which project from the edge surfaces of the respective side walls of the body. Accordingly, the body and the lid can be made to positively lock into each other.

Abstract: A duct assembly for enclosing conduits, cables, wires, lines and the like, comprising a base having a generally U-shaped cross section along its longitudinal axis, and a cover having a generally U-shaped cross section along its longitudinal axis. The base includes a generally planar central portion with first and second legs extending substantially perpendicular thereto. The cover includes an intermediate portion having third and fourth legs extending substantially perpendicular thereto. The cover is pivotally and releasably coupled to the base at one end and releasably coupled to the base at the other end. The pivotal and releasable coupling is made up and released via a snap fit resulting from forces exerted substantially perpendicular to the longitudinal axes of the cover and the base. The pivotal coupling allows angular movement of the cover relative to the base through about 45.degree. to about 60.degree..

Abstract: A duct assembly for enclosing conduits therein comprising a base and a pair of opposing side walls extending substantially perpendicular thereto, and a cover having an intermediate portion with a pair of generally parallel end portions extending substantially perpendicular thereto. The side walls of the base each have a tapered rib extending outwardly therefrom for engaging a U-shaped groove in the end portions of the cover to snap-fit the cover to the base. The ribs and grooves cooperate to provide first and second coupled positions. When the duct assembly is in its first position, a recess is formed for inserting a coupling member therein to join a substantially identical duct assembly thereto in a side by side relation. When the duct assembly is in its second position, the ribs and grooves are secured together to provide a smooth outer surface between the cover and the base. The bottom of each base can be snap fitted to the top of an identical base.

Abstract: A two-piece extruded aluminum alloy housing is shaped to provide support and ground conduction facility to power busway conductors contained therein. The two-piece housing is attached together with snap-fit connectors along its top and bottom surfaces. The housing is attached to the busway power conductors by means of insulated bolts. The bolts may be hollow so that air can flow through the bolts to aid in cooling the conductors within the housing by convection.

Abstract: The box has an end wall and four side walls extending therefrom to an open end. The end wall and each of the side walls has a plurality of different size concentric geometric figures formed by grooves in one side thereof whereby the end wall and each of the side walls may be cut along the grooves to form different size openings for receiving different size conduits for the flow of air therethrough. The open end of the box is adapted to be coupled to an inlet formed through the wall of a house or building for use as a register box. A wye connector adapter plate also is provided for connection to the open end of the box whereby the box may be used as a wye connector. The adapter plate has a plurality of different size concentric geometric figures formed by grooves in one side thereof whereby the adapter plate may be cut along the grooves to form different size openings for receiving different size conduits for the flow of air therethrough.

Abstract: A sleeve formed of shrinkable material has a longitudinal closure formed of projections and corresponding cut-outs along two longitudinal edges of the closure. The projections of the two longitudinal edges are offset relative to one another and have at least a partially clearly defined reinforcement in relation to the encasing component. When the projections have been fitted together, a retaining element is applied at least periodically to the reinforcements which have been fitted together in series.