Abstract: A drinking straw device includes a molded elastic sheet having a curved base portion, a first bent portion, and a second bent portion. The first and second bent portions are disposed at two opposite sides of the curved base portion to permit an inward surface of the first bent portion to overlap an outward surface of the second bent portion. The first and second bent portions are respectively imparted with an inward biasing force and an outward biasing force so as to bring the inward surface of the first bent portion and the outward surface of the second bent portion into frictional and abutting engagement with each other to thereby allow the molded elastic sheet to constitute a straw tube extending along a tube axis.

Abstract: A waveguide includes a tubular resin portion formed of resin, a conductor layer formed on an inner surface of the resin portion, and a fitting held by the resin portion. The fitting includes an inner exposed portion having an exposed surface that is not covered with a resin that is a material for the resin portion. The conductor layer covers the exposed surface of the inner exposed portion and is in contact with the inner exposed portion.

Abstract: A method of making a tube (60) includes forming at least one tube layer (101, 106, 108); and forming at least one film layer (102, 103, 104) on the at least one tube layer, wherein the at least a portion of the at least one film layer does not completely overlap the at least one tube layer.

Abstract: Systems and methods for sealing a problem zone of a subterranean well include a wire mesh member with a tubular shape and a plurality of openings. The wire mesh member has an initial orientation with an initial outer diameter that is greater than an inner diameter of the wellbore, a reduced orientation with a reduced outer diameter that is less than the inner diameter of the wellbore and an induced bending stress, and an installed orientation with an installed outer diameter that is generally equal to the inner diameter of the wellbore and a residual bending stress. The wire mesh member is positioned within the problem zone and moved to the installed orientation so that an outer surface of the wire mesh member engages an inner surface of the wellbore. The plurality of openings are plugged to prevent a flow of fluid radially through the wire mesh member.

Abstract: A ground strap for grounding electrical cables for protection against at least one of EMI, RFI or ESD and method of construction thereof is provided. The ground strap has a wall with opposite edges extending along a lengthwise direction between opposite ends. The wall is formed from a plurality of interlaced filaments, with at least some of the plurality of interlaced filaments including a plurality of electrically conductive filaments interlaced in electrical communication with one another.

Abstract: Methods and systems are provided for a convolute-swirl integrated duct (CSID). In one example the CSID may be configured to comply with engine roll and induce swirl in an intake air flow. Engine roll is absorbed as a result of a positioning of the CSID along an intake passage upstream of a compressor inlet and pre-whirl is introduced to intake air prior to delivery of the intake air to a compressor.

Abstract: A laminated building sheathing comprises a rigid foam board and a facer. The rigid foam board comprises a drainage pattern formed on a major surface of the foam board. The drainage pattern comprises a drainage channel. The facer is configured to cover the major surface of the rigid form board and to essentially conform to the drainage pattern. The facer is semi-permanently bonded to the drainage channel but permanently bonded to non-channel planar portions of the major surface.

Abstract: A cord and a wire puller are used to pass through narrow pipes or the like. The cord includes a first guide wire section and a second guide wire section. The first guide wire section includes a plurality of first guide wires, and the first guide wire section has a first segment in which the first guide wires are intertwisted with each other. At least a part of the first guide wires extends from the first segment to a transitional segment. The second guide wire section includes a plurality of second guide wires, and the second guide wire section has a second segment in which the second guide wires are intertwisted with each other. At least a part of the second guide wires extends from the second segment to the transitional segment, in which the first and second guide wires are intertwisted with each other.

Abstract: The present invention relates to a skin protection device comprising: a flexible cover having a first end and a second end. The cover comprises two sides extending between said first and second ends. The sides comprise seal sections capable of mutual engagement to form a seal. Each seal section includes a surface that is longitudinally serrated or undulating, wherein serration or undulation is provided on both sides of the section, a first female serrated or undulating side and a second male serrated or undulating side which when placed together form a mating pair and the seal. Each seal section is an extrusion as one part with a flat base and a plurality of serrations or undulations, folded and secured around the sides of the cover so that the flat base is in contact with both surfaces of the cover.

Abstract: The present invention relates to a protective wrapping medium, for particular application to large rolls of metal sheeting by automatic wrapping machines, for example as used within the steel and aluminum sectors, that is designed to provide both protection against physical damage which may occur during transport and/or storage, in addition to protection against chemical corrosion, while permitting printed branding to be incorporated into the wrapping medium if desired, the wrapping medium having a substrate with opposed first and second surfaces, with a first layer of cohesive material (22) applied as a substantially longitudinally extending band on the first surface adjacent a first edge of the substrate, and a second layer of cohesive material (24) applied as a substantially longitudinally extending band on the second surface adjacent a second edge of the substrate.

Abstract: A thermoplastics injection molding process coats a field joint of a pipeline by positioning a mold tool around the field joint to define a mold cavity. Thermoplastics material injected into the mold cavity forms a field joint coating that will set in the mold cavity. As the thermoplastics material shrinks in the mold cavity while the field joint coating sets, compacting pressure is applied radially inwardly within the mold cavity against a radially outer side of the field joint coating. A compacting fluid introduced into the mold cavity between the mold tool and the field joint coating may be used to apply pressure against the field joint coating. This accelerates and controls cooling of the field joint coating while maximizing quality.

Abstract: The disclosed inventive concept provides a crushable air duct having formed thereon a series of strategically positioned and patterned crack-initiating grooves. The grooves allow the air duct to be crushed in an impact event and a specified impact force, thereby protecting adjacent and higher cost under hood components from damage. In an impact event, the series of grooves allows the cracks in the air duct to readily propagate throughout the pattern in a controlled and predictable manner. The crushable air duct is formed from a rigid polymerized material. The duct includes an inlet and an outlet. The grooves are formed on either or both the exterior surface and the interior surface of the duct. Some of the grooves extend generally between the inlet and the outlet. These grooves are preferably parallel. Other grooves are circumferentially formed around the duct. At least some of the parallel and circumferential grooves intersect.

Abstract: A conduit system for protection of wiring or tubing comprising a tubular shaped conduit with latch system designed to allow insertion of electrical wiring without disconnection of the wiring or without threading the wiring through the conduit. The latch system is comprised of an internal latch, external latch or both and is formed to such that the conduit maintains its structural integrity while facilitating full and easy access to the electrical wiring contained within.

Abstract: A water spraying assembly includes a spray unit is selectively positioned on a support surface thereby facilitating a user to stand within the spray unit. The spraying unit is fluidly coupled to a fluid source thereby facilitating the spraying unit to spray a fluid onto the user. A spin unit is rotatably coupled to the spray unit and the spin unit is selectively rotated in a first direction. The user repeatedly jumps over the spin unit when the user stands within the spray unit. A remote control is provided and the remote control is in electrical communication with the spin unit such that the remote control selectively turns the spin unit on and off.

Abstract: A method of making an electrical structure having a foam housing is set forth. The foam housing includes an interior surface forming a conductive cavity adapted to carry energized waveforms therethrough. An electrical component of the electrical structure is integrally formed with the interior surface as the foam housing of the structure is assembled. The method includes the steps of depositing a plating material into a mold, pouring a foam polymer into the mold and removing the plated foam structure from the mold without etching the section from the mold. The method further includes steps of forming a metallic form into a planar structure, filling the open pores of the foam with a material such as photo-resist, machining a cavity from the foam, electroplating the cavity in the foam then removing the photo-resist material.

Abstract: Rapid radio frequency (RF) microwave devices and methods are disclosed. According to an aspect, a waveguide includes a body having first and second components that are attachable together to form an interior having a surface. Further, the waveguide includes a conductive material formed on the interior surface and shaped to convey electromagnetic waves.

Abstract: The invention concerns a lift system with at least one lift car able to ride in a lift shaft, while a travelling cable is provided, having a first end at the lift car side and a second end at the shaft side, wherein the weight force of the travelling cable is at least partially channelled into a traction means or balancing means engaging with the lift car.

Abstract: A hose assembly, preferably a garden hose assembly, including a fabric jacketed tube that is lightweight, durable and versatile. The tube is radially expandable when pressurized by a fluid, such as water, but does not increase in length. The two layer construction of the hose assembly allows for storage in relatively compact spaces, similar flow rates, approximately one-half the weight, and improved maneuverability when compared to conventional hose constructions. In one embodiment the jacket is formed around the tube in a continuous process that welds a fabric, preferably using hot air, into the jacket. The welded joint forms a region of jacket that is preferably about twice the thickness of the rest of the jacket. This thicker region results in a stiffer section of jacket that makes the hose more controllable and consistent in use.

Abstract: A hose assembly, preferably a garden hose assembly, including a fabric jacketed tube that is lightweight, durable and versatile. The tube is radially expandable when pressurized by a fluid, such as water, but does not increase in length. The two layer construction of the hose assembly allows for storage in relatively compact spaces, similar flow rates, approximately one-half the weight, and improved maneuverability when compared to conventional hose constructions. In one embodiment the jacket is formed around the tube in a continuous process that welds a fabric, preferably using hot air, into the jacket. The welded joint forms a region of jacket that is preferably about twice the thickness of the rest of the jacket. This thicker region results in a stiffer section of jacket that makes the hose more controllable and consistent in use.

Abstract: A seal, lead-through or transit for cables, wires or pipes which seal, lead-through or transit has one or more compressible parts surrounding the cable, etc. and a position of an opening receiving the cable, etc. is adjustable. In one example, the opening may be placed off-center on a partition line between two module parts. In other example, an inner compressible body may be placed inside an outer compressible body or between two module parts. The inner compressible body has an opening receiving the cable, etc. which opening is placed off-center. By rotating the inner compressible body the position of the opening receiving a cable, etc. is adjusted.

Abstract: When a bridge pier is reinforced or repaired by wrapping a reinforcement around the pier, a waterproof sheet having a sufficient flexibility to attach to and cover the interface between the pier and the reinforcement in a liquid-tight manner is useful. The waterproof sheet is attached to the interface between the pier and the reinforcement to prevent water from penetrating into the interface for thereby preventing the reinforcement from deterioration.

Abstract: The present invention thus provides a double-jacketed lay-flat fire hose having an inner tube for conveying fluid, an inner jacket surrounding the inner tube and an outer jacket surrounding the inner jacket. The outer jacket is made of an abrasion-resistant woven fabric material that includes four longitudinal, spaced-apart and generally parallel stripes formed each of a bundle of longitudinally aligned filament yarns. This outer jacket is less prone to trapping air between the outer jacket and the inner jacket.

Abstract: A tubular liner for the lining of pipelines has an inner tubular film, a layer of fibrous material arranged on the inner tubular film, and an outer tubular film which is arranged on the outer side of the fibrous material and is impermeable to UV light. The tubular liner is distinguished in that the outer tubular film has a radially inward peripheral portion and a second peripheral portion bearing on the outer side of the first peripheral portion in an overlapping region. The peripheral portions are connected to one another by an adhesive tape which extends across the longitudinal direction of the tubular liner. A method is also provided for manufacturing such a tubular liner.

Abstract: A subpanel for a bag stand includes: a first side panel and a second side panel, each of the first side panel and the second side panel including a top end, a bottom end, two side ends, an inner surface, an outer surface, and a thickness defined from the inner surface to the outer surface. The first side panel additionally includes a connection finger, the connection finger connected to a first side end of the two side ends of the first side panel, the connection finger including a clearance portion and a clasp portion. The second side panel is at least indirectly connected to the first side panel and defines a connection recess in a first side end of the two side ends of the second side panel distal from the first side panel, the connection recess including a clearance portion and a lock portion.

Abstract: The urine attachment for toilets is a device that includes a mounting bracket that is configured to attach onto a toilet. The mounting bracket supports a telescoping funnel that is adapted to be urinated in and which directs urine along a conduit, and into a toilet bowl. The mounting bracket includes a mounting member that is adapted to interface with a bottom surface of a toilet tank, and which is affixed to a mounting conduit. The mounting conduit extends from the mounting member over to a rotating disk. The rotating disk is adapted to be positioned adjacent a toilet rim of a toilet bowl. The rotating disk enables the conduit that extends from the telescoping funnel to be adjusted.

Abstract: A wrapped textile sleeve for protecting an elongate member and method of construction thereof is provided. The sleeve includes an inner layer having opposite inner edges extending lengthwise between opposite inner ends. The opposite inner edges are laterally spaced from one another by an inner width. The sleeve further includes an outer layer having opposite outer edges extending lengthwise between opposite outer ends. The opposite outer edges are laterally spaced from one another by an outer width. An adhesive intermediate layer is sandwiched between the inner layer and the outer layer, wherein a melted portion of the adhesive intermediate bonds the inner layer to the outer layer. The adhesive intermediate layer extends beyond at least one of the inner edges to provide an exposed region of the adhesive intermediate layer. The exposed region is bonded to the outer layer and maintains the outer layer in a wrapped, tubular configuration.

Abstract: Load carrying belts, a conveyor system incorporating such belts and a method for transporting material from a loading zone to an unloading zone are provided. In one embodiment of a conveyor system, a specially configured belt is hung from a haul rope that loops around a pair of rotatable end sheaves. If necessary, there may be one or more intermediary support towers in spaced apart locations between the end sheaves having one or more support rollers over which the haul rope rides. The belt is specifically configured for hanging from the haul rope and providing one or more compartments within which the material being transported is enclosed. The compartment(s) may be opened in the loading zone to permit introduction of material to be transported into the compartment(s), closed between the loading zone and the unloading zone, and reopened in the unloading zone to permit discharge of the material. In some embodiments, the belt may include a plurality of corrugations in order to enhance flexibility of the belt.

Abstract: A conductor cover apparatus for use with an overhead electrical transmission and distribution system and related methods is provided. The conductor cover apparatus has a center cover member. At least one arm connector is formed on the center cover member, the at least one arm connector having an opening and a first hole positioned between a first external side and a second external side of the at least one arm connector. An extension arm is positioned at least partially interior of the first and second external sides of the at least one arm connector. At least one pin is removably connecting the extension arm to the at least one arm connector, wherein the at least one pin is positioned through the first hole of the at least one arm connector and a first arm hole within the extension arm.

Abstract: A universal, attachable urinal. Urine is discharged into receptacle (2) that funnels to a waste-tube (11) that runs through a hollow arm (3) to a pre-existing waste receiver. The arm (3), mounted by the receptacle (2), pivots on a stationary leg (4) between an operational and a nonoperational position. The leg (4) is secured next to the toilet by foot (6a) and/or support arm (7), using the closet bolt (8), toilet seat bolt (9), or other nearby secured object. A water line runs from the toilet's water source to the receptacle (2) for rinsing it and the conjoined waste-tube (11). Embodiments vary between the waste-tube (11) leading to the toilet bowl (12) or sewer-line (39), the manual or semi-automatic upright return of the arm (3), methods for securing the leg (4), and methods for controlling water dispersion to and in the receptacle (2) for rinsing.

Abstract: A method of forming a bag stand including the steps of: bending a first subpanel along a hinge from a flattened arrangement, the first subpanel including a plurality of side panels and a connection mechanism, each of the plurality of side panels including a left end and a right end, the hinge positioned between a first side panel of the plurality of side panels and an adjacent second side panel of the plurality of side panels; and connecting the first subpanel to a second subpanel by the connection mechanism.

Abstract: A tubular liner for pipelines includes an inner tubular film and a fiber material layer located on the film and impregnated with a reactive resin curable under UV light. The film contains a styrene-proof and thermally weldable carrier material having a laminated non-woven layer on its outer side facing the fiber material. The carrier material includes an overlapping region along the film. Edge sections of the carrier material are thermally welded together in the overlapping region. The non-woven layer on the outer side of the radially inner lower edge section in the overlapping region is thermally welded to the carrier material on the lower side of the radially outer upper edge section, and the radially outer upper edge section in the overlapping region has a structure on its outer side enabling a durable adhesion of reactive resin. A method for manufacturing the tubular liner is provided.

Abstract: A covering for electric cords includes an elasticized fabric sleeve having a first end defining a first opening and a second end defining a second opening. The sleeve defines a lumen between the first and second openings configured to dispose an electric cord therein. The covering further includes a tether slidingly disposed within the lumen of the sleeve adapted to dispose the electric cord within the lumen of the sleeve.

Abstract: A snap-in card top riser is provided having a riser and a display module. The riser has a hook profile that is adapted to be received into a channel on the display module so that the riser is secured to the display module in a manner that restricts removal of the riser from the display module. The channel has one or more tabs that are configured to cause the hook profile to compress while the tabs are engaging with the hook profile. The hook profile, once fully received into the channel, returns to an original or uncompressed position to prevent removal of the hook profile from the channel.

Abstract: A lining material obtained by rolling a lining material sheet into a tubular form is installed in a conduit with both ends of the lining material sheet in its circumferential direction circumferentially overlapping each other. In this process, the lining material is installed so that, in a bending portion of a conduit, an overlapping portion where the both ends of the lining material sheet overlap each other faces toward an outer curvature side of the bending portion. Then, the diameter of the lining material installed in the conduit is expanded with the both ends of the lining material sheet circumferentially slid on each other. This facilitates inflation of a portion of the lining material which portion faces toward the outer curvature side in the bending portion, thereby decreasing a gap between the lining material and an inner surface of the bending portion.

Abstract: A cable routing system is described. More specifically, described is a cable routing system that includes a main fiber channel configured to receive a drop fiber to allow it to fit within the main fiber channel, where the channel is surrounded by a discontinuous segmented duct, and the duct comprises a continuous flange structure to provide support for the system as it is installed on or fastened to a wall or other generally flat surface.

Abstract: A tubular liner for rehabilitating sewers includes a circumferentially expandable reinforcing layer impregnated with a light-curable reactive resin, and an outer tubular film surrounding the reinforcing layer and formed of a radially expandable material impermeable to UV light, in particular a liquid-tight and gas-tight plastic film. The tubular liner can be pulled into a sewer to be rehabilitated and can be expanded, in particular by using compressed air, so that the reinforcing layer and the outer tubular film contact the inner wall of the sewer before the reactive resin is cured. A protective tube made of a tear-resistant material is disposed around the outer tubular film and has a connecting portion extending in the longitudinal direction of the outer tubular film and being expandable in the circumferential direction by introducing compressed air into the tubular liner.

Abstract: A protective guide has a long shape and internally holds long members including at least one of flexible cables and ducts. The protective guide includes a flexible curved strip-shaped base and a plurality of flexible sectioning members. The base is made of a synthetic resin, formed into a long plate and has a longitudinal direction. The sectioning members are also made of a synthetic resin, permitted to uprise from both ends of the base and spaced apart from each other in the longitudinal direction, the both ends being opposed to each other in a direction perpendicular to the longitudinal direction. The sectioning members cooperatively define a space for accommodating the long members along the base. The base has a cross section inwardly curved toward the space, as viewed in the longitudinal direction.

Abstract: The present disclosure relates to a fiber optic cable and a method for manufacturing the cable. The cable includes an outer jacket that defines a fiber passage and first and second reinforcing member passages, an optical fiber ribbon, and reinforcing members. The method includes extruding the jacket, feeding the ribbon into the fiber passage, and feeding the reinforcing members into the reinforcing member passages. The jacket has a width and a thickness. The width is longer than the thickness. The reinforcing member passages are positioned on opposite sides of the fiber passage. The reinforcing members are paid-off from a single spool by paying-off a precursor reinforcing member from the spool. The precursor reinforcing member can be divided (e.g., by using a slitter) into the reinforcing members which are then fed into the reinforcing member passages.

Abstract: A hose shroud (10) comprising a plurality of expanded sections (12) and clamping sections (22), arranged to engage a bundle of hoses or lines, wherein in use, the hose shroud (10) is arranged such that an outer wall (18) of the hose shroud (10) is placed under an inner wall (20) of the hose shroud (10) defining a reservoir (28) therein, the inner wall (20) and outer wall (18) are held in close contact by a plurality of raised protuberances (16) on the outer wall surface (18), the spaced apart inner (20) and outer wall (18) surfaces of the hose shroud (10) are arranged such as to form a lumen (14) to allow fluid communication of fluids leaked within the reservoir (28) and the exterior of the hose shroud (10).

Abstract: A flexible hose (1) has at least two textile reinforcement inlays or inserts (5, 6, 7) and an inner layer (2) made of elastomeric material. The flexible hose can assume various curvature geometries and, on the other hand, is still pressure-resistant because a textile reinforcement inlay (5) made of a peripherally closed, tubular knitted or woven fabric is applied to the elastomeric inner layer (2). A textile layer (6), which is rubber-coated on both sides, is wound as a further textile reinforcement inlay onto the tubular knitted or woven fabric (5).

Abstract: A hose for transporting fluids in which a plurality of carcass layers is disposed between an inner surface rubber layer and a cover rubber layer, and a visible design, continuous in a hose axial direction, is provided on an outer surface of the cover rubber layer. The hose for transporting fluids includes a sliding-surface layer that is embedded at least partially in the hose axial direction in the cover rubber layer and that is non-adhesive with respect to the cover rubber layer, and a constraining layer that is embedded so as to be wound partially in a hose circumferential direction on an outer side of the sliding-surface layer and that is adhesive with respect to the cover rubber layer.

Abstract: An air duct includes a top wall, a first sidewall, a second sidewall, a first connecting member, and a second connecting member. The first and second connecting members are made of resilient materials. The top wall is connected between the first and second connecting members. The first sidewall is connected to the first connecting member; and the second sidewall is connected to the second connecting member. The first and second connecting members are capable of being pliable to move the first and second sidewalls relative to each other.

Abstract: A power transmission line cover includes an elongate, flexible panel and first and second elongate, integral edge portions. The first edge portion includes an elongate first latch feature and the second edge portion includes an elongate second latch feature. The cover includes an elongate inner creepage extender wall forming a part of one of the first and second edge portions, and an elongate outer creepage extender wall forming a part of one of the first and second edge portions. The flexible panel is wrapped about a power line and the edge portions are joined together to form a longitudinally extending closure seam wherein the latch features are coupled and the edge portions form an electrical creepage path extending from the chamber to an exterior boundary of the cover along the inner creepage extender wall, between the first and second latch features, and along the outer creepage extender wall.

Abstract: Apparatus for preventing fluid spray at a leakage area of a fluid pipe comprises at least one first enveloping element and at least one second enveloping element which encloses the fluid pipe so as to be flush with it, and which are circumferentially interrupted, wherein the circumferential interruptions of the enveloping elements are arranged so as to be offset relative to each other. In this way, fluid spray formation may be prevented in an economical way. The simple design ensures easy installation and economical production.

Abstract: A water supply system is described for supplying water to a linearly moving irrigation system. The water supply system is able to take water from a stationary water supply conduit (either a collapsible conduit or a rigid conduit) and feed it into one end of a feed pipe for the irrigation system. The water supply system includes a pickup shoe which extends into the water supply conduit through a traveling opening in the top side of the conduit. The pickup shoe intercepts substantially all of the water in the supply conduit and pumps it upwardly through the traveling opening to the feed pipe for the irrigation system. The pump is located in the portion of the shoe which extends into the supply conduit.

Abstract: A pressure washer is provided. The pressure washer includes a fluid inlet and a pump disposed to receive fluid from the fluid inlet. A spray gun is provided that includes a first outlet and a separate second outlet. A first conduit fluidly connects the fluid inlet and the pump with the first outlet and a second conduit fluidly connects the fluid inlet with the second outlet.

Abstract: A ventilation duct assembly kit for use for forming interconnecting ventilation ducts. The kit includes a pallet supporting a flexible panels that are shapeable into ductwork elements. Each of the panels has opposite duct-forming sides, opposite interconnecting sides for interconnection to a subsequent panel formed into a ductwork element, and a male and female interlocking interfaces respectively fixed on first and second opposite duct-forming sides for interlocking of the duct-forming sides together. The kit also includes slideable locking elements shaped to slide and fit over assembled male and female interlocking interfaces. A plurality of collets shaped to fit over the interconnecting sides of the formed ductwork elements and sized to extend between the adjacent slideable locking elements from corresponding adjacent shaped ductwork elements that are linked through the collet are also provided. A method of assembling such interconnecting ventilation ducts is also disclosed.

Abstract: A method for forming a large diameter and very long pipe comprises forming a plurality of pultruded segments via pultrusion and joining the segments along the lengthwise edges thereof.

Abstract: A method and device for the heat treatment of a profile, in particular an extruded profile for aircraft. The profile may be formed by one or more different, in particular curable, aluminium alloys. The method provides that at least two regions of a profile are subjected to a different heat treatment. The device includes a first chamber that encloses a first region of a profile and a second chamber that encloses a second region of the profile, wherein different temperatures can be set in the first and second chambers. The profile has at least two regions that each have different material properties and are formed by differential heat treatment.

Abstract: Ringed tubular sheath comprising two open shells (33, 37), termed the outer (33) and inner (37) shells, both of the same diameter (D), one of which, the outer shell (33), has an opening (E1) smaller than the diameter (D) so as to engage by elastic deformation over the inner shell (37) in a closed position. In the course of this engagement, the opening (E1) of the outer shell (33) becomes stretched until it passes a point corresponding to the diameter (D) of the inner shell (37) and, beyond this point, returns to the unstretched position. In the invention, the two shells (33, 37) are connected to a hinge (17) so as to engage by pivoting about the hinge (17), the opening (E1) of the outer shell (33), which is smaller than the diameter (D), extending from the hinge (17) to an opposite edge (34) of the shell.