A dispenser for viscous or pasty materials comprises a storage container in the form of a flexible tube (2) and an applicator (24). The tube (2) comprises an elongate, 1 -piece hollow moulding of polymeric material, one end of which is closed and formed at the other end of which is an integral dispensing valve defining one or more dispensing slits (22). The or each dispensing slit is defined by a respective pair of resilient plates (18), which are opposed and inclined to one another and have a respective free edge, the two free edges defining a dispensing slit. The applicator has an applicator surface and one or more passages (30), into which the free edges of a respective pair of resilient plates is received. The width of each passage in the applicator is dimensioned such that there is a gap between the free edges of the resilient plates and the associated side surfaces of the passage, when the dispensing slit is closed and so that this gap is substantially closed, when the dispensing slit is opened by the application of pressure to the flexible tube in order to dispense material within the tube.
B65D 47/44 - Closures with filling and discharging, or with discharging, devices with pads or like contents-applying means combined with slits opening when container is deformed or when pad is pressed against surface to which contents are to be applied
2.
BEVERAGE FOAMING DEVICE AND SEALED BEVERAGE CONTAINER THEREWITH
A beverage foaming device or "widget" comprises a cylindrical container (2) with two ends, one end being closed by an integral first end plate (10) and the other end being closed by a cover (6) in which an aperture (26) is formed. The aperture (26) is situated, in use, below the surface of a carbonated beverage in a beverage container. The cylindrical container (2) also contains a piston (4), whose outer edge (22) forms a substantially liquid-tight seal in with the interior surface of the container (8) and which is slidably received within the cylindrical container (8). The foaming device further includes an abutment (16), which is integral with the inner surface of the first end plate (10) and is arranged to limit the movement of the piston (4) within the container (2) in the direction away from the cover (6).
B65D 85/73 - Containers, packaging elements or packages, specially adapted for particular articles or materials for edible or potable liquids, semiliquids, or plastic or pasty materials with means specially adapted for effervescing the liquids, e.g. for forming bubbles or beer head
A method of injection molding a plastics component includes providing a first mold member with a mold cavity, which is defined by an internal surface, and a second mold member with an external surface whose shape is complementary to the shape of the mold cavity. Either the internal surface or the external surface carry an elongate formation with an elongate apex. The method includes advancing the second mold member into the mold cavity such that the apex is spaced from the opposed one of the internal surface and the external surface by a predetermined distance and the internal surface of the first mold member and the external surface of the second mold member together define a mold space. Molten polyolefin material is then injected into the mold space to substantially fill it. The predetermined distance is so dimensioned that the polyolefin material does not completely fill the space between the apex and the opposed surface and the slit is thus formed.
B29C 45/00 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor
B65D 47/08 - Closures with discharging devices other than pumps with pouring spouts or tubesClosures with discharging devices other than pumps with discharge nozzles or passages having articulated or hinged closures
B65D 47/20 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge
Method of injection molding a plastics component includes providing a first mold member with a mold cavity, defined by an internal surface, and a second mold member with an external surface complementary to the mold cavity shape. Either the internal or external surface carry an elongate formation with an elongate apex. Then, the second mold member is advanced into the mold cavity such that the apex is spaced from the opposed one of the internal surface and the external surface by a predetermined distance and the internal surface of the first mold member and the external surface of the second mold member together define a mold space. Molten polyolefin material is then injected into the mold space to substantially fill it. The predetermined distance is so dimensioned that the polyolefin material does not completely fill the space between the apex and the opposed surface and the slit is thus formed.
B29C 45/00 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor
B65D 47/08 - Closures with discharging devices other than pumps with pouring spouts or tubesClosures with discharging devices other than pumps with discharge nozzles or passages having articulated or hinged closures
B65D 47/20 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge
A method of injection moulding a plastics component with a slit includes providing a first mould member (26) affording a mould cavity, which is defined by an internal surface, and a second mould member (28) with an external surface whose shape is substantially complementary to the shape of the mould cavity. One of the internal surface and the external surface carries an elongate formation which defines an elongate apex (38; 58). The second mould member (28) is advanced into the mould cavity such that the apex (38; 58) is spaced from the opposed one of the internal surface and the external surface by a predetermined distance and the internal and external surfaces together define a mould space. Molten polymeric material is then injected into the mould space to substantially fill it. The predetermined distance is so dimensioned that the polymeric material does not completely fill the space between the apex and the opposed surface, whereby the slit is formed.
B29C 45/00 - Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mouldApparatus therefor
B65D 47/20 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge
B65D 47/08 - Closures with discharging devices other than pumps with pouring spouts or tubesClosures with discharging devices other than pumps with discharge nozzles or passages having articulated or hinged closures
A closure for a beverage container includes a tubular portion (2) for connection to the edge (32) of an aperture in the beverage container (30) and a cap (12, 14) which is removably connected to the tubular portion (2) and seals it. A first depending wall (4) is connected to the tubular portion (2) and a second depending wall (22) is connected to the cap. A seal member (26) is connected in a sealed manner to the first wall (4) and is in sealing contact with the second wall (22). The first and second walls (4, 22) and the seal member (26) together define a reservoir for a chemical substance (24) which is normally closed but when the cap is removed the second wall (22) is moved with respect to the first wall (4) and the reservoir is opened. When the closure is in use closing a beverage container, the reservoir is occupied by a first chemical substance and a second chemical substance is dissolved in the beverage. When the cap is removed, a first chemical substance drops into the beverage and the two chemical substances are selected such that they then react to produce carbon dioxide, thereby carbonating the beverage.
B65D 51/28 - Closures not otherwise provided for combined with auxiliary devices for non-closing purposes with auxiliary containers for additional articles or materials
A liquid dispenser of resealable type includes an outer tube (22) with a discharge opening (28) formed in it and an inner tube (20), which is partially accommodated within the outer tube (22) and defines with it an annular space. The outer tube is connected in a sealed manner to a one-piece connection member (2), which defines an inlet space, for connection to a liquid container. One end of the inner tube (20) is closed and the outer tube (22) is integrally connected to the inner tube (20) by a flexible integral web (24), whose width in the radial direction is greater than that of the annular space. A liquid flow opening (30) is formed in the wall of the inner tube (20) and the inner tube (20) is movable longitudinally within the outer tube (22) between an open position, in which the inlet space communicates with the discharge opening (28), and a closed position, in which the inlet space does not communicate with the discharge opening (28). The connection member (2) includes an integral tubular portion (10), of which one end is closed and the other end communicates with the inlet space. A liquid flow opening (12) is formed in the tubular portion (10) and the outer surface of the tubular portion (10) is in sliding sealed contact with the inner surface of the inner tube (20), whereby the two flow openings (12, 30) are at least partially in registry in the open position and are out of registry in the closed position.
B65D 47/28 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge with slide valves, e.g. formed with slidable spouts having linear movement
B65D 47/32 - Closures with discharging devices other than pumps with means for venting
B65D 77/06 - Liquids or semiliquids enclosed in flexible containers disposed within rigid containers
A container for dispensing a two-component liquid comprises an outer resilient container (2) for containing one component with a neck (4) defining an opening and an inner tubular container (16). The inner container (16) contains a piston (20, 22) slidably received within it. A closure member (18) extends over the entire area of the inner container and closes its lower end (16). The piston and the inner container define a reservoir for containing a second component. The neck (4) carries a closure cap (10,12) which affords a liquid dispensing opening (38). A first non-return valve (24, 32) communicates with the liquid dispensing opening (38) and with the interior of the inner container (16). An airflow path extends through the closure cap (10, 12) and the piston (20, 22) and includes a second non-return valve. The first non- return valve is arranged to permit liquid to flow from the inner container to the liquid dispensing opening and the second non-return valve is arranged to permit air to flow through the airflow path into the inner container. The closure cap (10, 12) cooperates with the piston (20, 22) so that movement of the closure cap in the downward direction results in movement of the piston towards the closure member. A finger (13) connected to the piston contacts the closure member (18) and moves it and thus opens the inner container, thereby permitting the component within it to fall down into the component within the outer container.
B65D 1/32 - Containers adapted to be temporarily deformed by external pressure to expel contents
B65D 51/28 - Closures not otherwise provided for combined with auxiliary devices for non-closing purposes with auxiliary containers for additional articles or materials
B65D 47/20 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge
A liquid dispenser includes an outer tube (2) with a discharge opening formed in its side wall and an inner tube (4), which is at least partially accomodated within the outer tube and defines with it an annular space, which accomodates an annular sealing member (20), which forms a peripheral seal with the inner and outer tubes. The other end of the outer tube is adapted for connection to a liquid container. A liquid flow opening (30) is formed in the wall of the inner tube and the inner tube is movable longitudinally within the outer tube between an open position, in which the liquid flow opening communicates with the discharge opening (14), and a closed position, in which the liquid flow path is sealed. An air flow passage with two ends is formed in the inner tube, which is so arranged that when the inner tube is in the open position one of the ends communicates with the discharge opening and the air flow passage.
B65D 47/28 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge with slide valves, e.g. formed with slidable spouts having linear movement
B65D 47/32 - Closures with discharging devices other than pumps with means for venting
B65D 77/06 - Liquids or semiliquids enclosed in flexible containers disposed within rigid containers
A dispensing valve for flowable material comprises a valve plate (26) of resilient polymeric material in which at least one elongate discontinuity is formed. The discontinuity defines at least one valve flap (28) which is an integral part of the valve plate but whose margin defined by the discontinuity is not connected to the adjacent material of the valve plate. The valve flap (28) is movable under the application of pressure from a closed position, in which the adjacent margins of the discontinuity form a substantial seal, to an open position, in which the margins for the discontinuity are spaced from one another and material can flow through the valve member. The polymeric material is a polyolefin material and the discontinuity is a rupture line. The margins defining the rupture line are of decreasing thickness towards their free edge and overlie one another.
An applicator for applying a substance in liquid, paste or gel form comprises a container (2), of which a portion is flexible and which includes an applicator portion, which is arcuate in cross-section and in which one or more first apertures (14) is formed. An elastic valve membrane (18) is connected to and overlies the applicator portion and one or more second apertures (22) are formed in it. The first apertures (14) are offset from the second apertures (22). The valve membrane (18) normally engages the applicator portion and the first apertures (14) are thus normally closed by the valve membrane (18) but the application of pressure to the flexible portion of the container produces an increase of the pressure of the container which results in the valve membrane (18) being forced away from the applicator portion against its elasticity. The second apertures (22) are slits, which are closed when the valve membrane (18) is in engagement with the applicator portion but which are open when the valve membrane (18) is forced away from the applicator portion.
B65D 85/00 - Containers, packaging elements or packages, specially adapted for particular articles or materials
B65D 47/20 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge
A45D 34/04 - Appliances specially adapted for applying liquid, e.g. using roller or ball
B65D 47/44 - Closures with filling and discharging, or with discharging, devices with pads or like contents-applying means combined with slits opening when container is deformed or when pad is pressed against surface to which contents are to be applied
A closure for a multiple component container includes an insert (12), a piston (20) and a cap (10). The insert (12) and the piston (20) define a reservoir and the insert (12) comprises a fixed cylindrical wall (26) and a movable wall (32) connected thereto and movable with respect thereto by the action of gas pressure within the reservoir. The movable wall (32) has a discharge aperture (36) formed therein. The cap (10) comprises a closure plate (14), integral with whose outer edge is a depending skirt (16), by means of which the cap may be secured to a container. The closure plate (14) cooperates with the piston (20) such that movement of the closure plate towards the insert (12) results in movement of the piston also in the same direction. The piston (20) forms a sliding seal with the internal surface of the fixed cylindrical wall (26). A valve member (22) is integral with, the piston (20) and is slidably received in and seals the discharge aperture (36).
B65D 47/06 - Closures with discharging devices other than pumps with pouring spouts or tubesClosures with discharging devices other than pumps with discharge nozzles or passages
B65D 47/20 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge
B65D 51/28 - Closures not otherwise provided for combined with auxiliary devices for non-closing purposes with auxiliary containers for additional articles or materials
A drinking cap includes a first tubular portion (10) for connection to the mouth of a beverage container and an elongate actuating member (26) situated at least partly within the first tubular portion (10) and connected to it by a resilient, annular, integral web (12), in which one or more flow openings (28) are formed. The actuating member (26) is longitudinally movable in the axial direction between an open position of the flow openings (28) and a closed position thereof. The cap also includes an insert (6) and a piston (4) which together define a reservoir (56). The insert (6) includes a cylindrical wall (34) and a portion (40) which is movable under the action of pressure within the reservoir and in which a discharge aperture (44) is formed. A flow tube (52) is connected to the piston (4) around an aperture (50) and extends through the discharge aperture (44) in the insert (6) and forms a sliding seal with the edge (46) of the discharge aperture. The actuating member (26) is arranged to engage the piston (4) when it is moved from the closed position to the open position and thus to move the piston (4) towards the insert (6), whereby the increased pressure created in the reservoir (56) causes the movable portion (4) of the insert (6) to move away from the piston (4) until the flow tube (52) moves out of the discharge aperture (44) in the insert (6).
B65D 47/20 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge
B65D 51/28 - Closures not otherwise provided for combined with auxiliary devices for non-closing purposes with auxiliary containers for additional articles or materials
A beverage container comprises a bottle (2) and is sealed by a lid of resilient material. The bottle includes a neck (8) defining an opening and the lid includes a closure plate (32), integral with which is a depending skirt (18) extending around the outer surface of the neck. The skirt (18) carries an annular flange (20), which is in sealing engagement with the underside of the downwardly directed annular shoulder (14) on the outer surface of the neck. The annular flange (20) is connected to the skirt (18) by an integral hinge. The internal surface of the skirt (18) carries an annular protuberance (52), which is in sealing engagement with one side surface of the annular flange, the other side surface being in sealing engagement with the outer surface of the neck. The said one side surface of the annular flange includes an annular portion which extends downwardly and inwardly and is in contact with a corresponding annular portion on the surface of the annular protuberance (52).
B65D 43/10 - Removable lids or covers having a peripheral flange fitting over the rim of the container and retained by snapping over beads or projections
An insert for a multiple component container includes an upper seal member (10), a depending annular wall (22) sealed to the underside of the seal member (10), a depending spigot (20) connected to the underside of the seal member (10) and a movable wall (28; 60) carried by the depending wall (22). The seal member (10), the depending wall (22) and the movable wall (28; 60) define an interior space. The movable wall (28; 60) is movable with respect to the depending wall (22) under the action of a pressure within the interior space and affording a discharge aperture (32), within which the spigot (20) is slidingly and sealingly received. The interior space accommodates a movable piston member (8), which divides the interior space into a gas space (46) and an ingredient space (44) below it. The outer edge of the piston member (8) forms a sliding seal with the inner surface of the depending wall (22) and a hole is formed in the piston member in which the spigot (20) is slidingly and sealingly received. A gas supply pathway (34) communicates with the gas space (46) and is constructed to permit gas to flow from the exterior of the depending wall (22) into the gas space but substantially to prevent flow in the opposite direction.
B65D 51/28 - Closures not otherwise provided for combined with auxiliary devices for non-closing purposes with auxiliary containers for additional articles or materials
A closure for a container comprises a circular closure plate (2, 4), integral with the outer edge of which is a depending skirt (8), integrally connected to the lower end of which by means of a resilient annular integral hinge (10) is an annular flange (12), which extends generally upwardly and inwardly. The closure also includes a cutter assembly which includes a cutting blade (38) and is mounted to rotate about the centre of the closure plate (2, 4). The integral hinge (10) has a hole formed in it through which the cutting blade (38) extends. Rotation of the cutter assembly about the centre of the closure plate thus results in cutting of the integral hinge (10) and thus in release of the closure plate (2, 4) and the depending skirt (8) from the annular flange (12).
An insert for a multiple component container includes a reservoir with an opening defined by a peripheral edge which, in use, is connected to a sealing element (20). In use, the reservoir and the sealing element define a substantially sealed space. The reservoir includes a stationary portion (2) and a movable portion (4), which is connected to the stationary portion and is movable with respect thereto by the action of gas pressure within the reservoir. A discharge opening (6) is formed in the movable portion (4) and a gas leakage path is provided in the reservoir wall. A valve member (14) is connected to the stationary portion (2) and cooperates with the discharge opening (6) and substantially seals it. The application of a greater gas pressure to the interior of the reservoir than to its exterior results in movement of the movable portion (4) away from the stationary portion (2) and thus in the valve member (14) moving out of sealing contact with the discharge opening (6).
B65D 51/28 - Closures not otherwise provided for combined with auxiliary devices for non-closing purposes with auxiliary containers for additional articles or materials
B65D 81/32 - Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging two or more different materials which must be maintained separate prior to use in admixture
B65D 85/73 - Containers, packaging elements or packages, specially adapted for particular articles or materials for edible or potable liquids, semiliquids, or plastic or pasty materials with means specially adapted for effervescing the liquids, e.g. for forming bubbles or beer head
A beverage container comprises a bottle (2) which has a central axis (3) and is sealed by a lid of resilient material. The bottle includes a neck (8) defining an opening and the lid includes a closure plate (30, 32), integral with which is a depending skirt (18) extending around the outer surface of the neck. The skirt (18) carries an annular flange (20) which is in sealing engagement with the underside of a downwardly directed annular shoulder (14) on the outer surface of the neck. The annular flange (20) is elongate in axial sectional view and is connected to the skirt (18) by an integral hinge connection (22). The end surface of the free end of the annular flange (20) is in sealing engagement with the underside of the shoulder (14). The internal surface of the skirt carries an annular protuberance (52) which is in sealing engagement with one side surface of the annular flange (20). The other side surface is in sealing engagement with the outer surface of the neck of the bottle, whereby an annular chamber (54) is defined by the inner surface of the skirt (18), the said one side surface of the annular flange (20), the protuberance (52) and the hinge (22). A rip tab (24) is provided integrally connected to the integral hinge (22). An aperture (50) is provided in the integral hinge (22) adjacent the connection of the rip tab (24) to the integral hinge (22).
A drinking cap constitutes a one-piece moulding of polymeric material including a first circular section tubular portion (2) for connection to the mouth of a beverage container and a second smaller circular section tubular portion (6) situated at least partially within the first tubular portion. The first tubular portion is connected to the second tubular portion by a resilient, annular, integral web (4), in which one or more flow openings (18) are formed. One end of the second tubular portion (6) is closed. The upper or external surface of the web (4) carries a projecting annular first sealing flange (20) at a point intermediate its ends, as seen in axial sectional view. The first and second tubular portion (2, 6) are coaxial and relatively movable in the axial direction between an open position, in which the flow openings (18) are unobstructed, and a closed position, in which the sealing flange (20) is in sealing engagement with the internal surface of the first tubular portion (2). The flow openings (18) are thus prevented from communicating with the atmosphere. When the cap is in the closed position, the free edge of the first sealing flange (20) forms a substantially line seal with the internal surface of the first tubular portion (2).
A liquid dispenser, such as a tap for a liquid container particularly a wine box, includes an outer tube (2) with a discharge opening (14) formed in its side wall and an inner tube (4), which is at least partially accommodated within the outer tube (2) and defines with it an annular space, which accommodates an annular sealing member (20), which forms a seal with the outer tube. One end of the inner tube (4) is closed and one end of the outer tube (2) is integrally connected to the inner tube (4) by a flexible, integral annular web (10), whose width in the radial direction is greater than that of the annular space. The other end of the outer tube (2) is adapted for connection to the liquid container. The inner tube (4) is movable longitudinally within the outer tube (2) between an open position, in which there is a liquid flow path between the said outer end of the outer tube and the discharge opening (14), and a closed position, in which the outer surface of the inner tube (4) forms a sliding seal with sealing member (20) and the said liquid flow path is sealed.
B65D 47/06 - Closures with discharging devices other than pumps with pouring spouts or tubesClosures with discharging devices other than pumps with discharge nozzles or passages
B65D 47/28 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge with slide valves, e.g. formed with slidable spouts having linear movement
A dispensing cap for a beverage container constitutes a one-piece moulding of plastic material including a first circular section tubular portion (2) with first radius for connection to the mouth of the container and a second circular section tubular portion (6) with a second smaller radius. One end of the first tubular portion is connected to one end of the second tubular portion by a resilient annular integral web (4), in which one or more flow openings (18) are formed. The width of the web is equal to or greater than the difference between the first and second radius. The other end of the second tubular portion (6) is closed. One of the web (4) and the internal surface of the first tubular portion adjacent the said one end thereof is connected to a projecting annular first sealing flange (20). The first and second tubular portions (2, 6) are co-axial and relatively movable in the axial direction between an open position, in which the second tubular portion (6) is located outside the first tubular portion (2) and the flow openings are unobstructed, and a closed position, in which the said one end of the second tubular portion is located within the said one end of the first tubular portion and the sealing flange (20) is in sealing engagement with the other of the web (4) and the internal surface the first tubular portion (2), whereby the flow openings (18) are prevented from communicating with the interior of the first tubular portion by the sealing engagement of the first sealing flange (20) with the other of the web (4) and the internal surface of the first tubular portion (2). The said other end of the said second tubular portion (6) carries a radially projecting circumferential flange (16). One or more flow opening (17) are formed in the circumferential flange. The moulding further includes two half shells (42) of semi-cylindrical shape, the upper edge of each of which is integral with and sealed to the circumferential flange (16) and the lower edge of which forms a sliding seal with a first tubular portion (2). Each side edge of each half shell forms a seal with a side edge of the other half shell, whereby defined within the two half shells (42) there is a liquid flow space with which the flow openings (18, 17) in the web (4) and in the circumferential flange communicate.
B65D 47/20 - Closures with discharging devices other than pumps comprising hand-operated members for controlling discharge
B65D 47/06 - Closures with discharging devices other than pumps with pouring spouts or tubesClosures with discharging devices other than pumps with discharge nozzles or passages
A closure for a beverage container (2), such as a beer bottle, includes a closure plate (l0), connected to which is a diaphragm (20), which together with the closure plate defines a gas reservoir (22). A movable portion (24) of flexible material is integrally connected to the diaphragm (22). The upper end of the 10 movable portion, which may be in the form of a tube (24) or pocket (3), is open and communicates with the gas reservoir and the other end is substantially closed and has a gas charge/discharge orifice (28) formed in it. The movable portion is connected to the remainder of the diaphragm by at least one pair of fold lines of opposite sense. When the closure is applied to a container, the gas charge/discharge orifice (28) is above the liquid level. The headspace of the container and the reservoir (22) are filled with pressurised gas and when the pressure is released the pressure differential across the movable portion results in rotation about the fold lines with the result that the movable portion moves away from the closure plate so that the gas charge/discharge orifice is situated beneath the liquid surface and the pressurised gas in the gas reservoir (22) is injected into the liquid in the container.
B65D 85/73 - Containers, packaging elements or packages, specially adapted for particular articles or materials for edible or potable liquids, semiliquids, or plastic or pasty materials with means specially adapted for effervescing the liquids, e.g. for forming bubbles or beer head
A beverage container comprises a bottle (2) which has a central axis and is sealed by a lid (6) of resilient material. The bottle has a neck (8) defining an opening and the lid (6) includes a closure plate (30, 32), integral with which is a depending skirt (18) extending around the outer surface of the neck. The skirt (18) carries an annular flange (20) which is in sealing engagement with the underside of a downwardly directed shoulder (14) on the outer surface of the neck. The annular flange (20) is connected to the skirt (18) by a resilient hinge connection (22). The annular flange (20) is elongate in axial sectional view, the end surface of the free end of the flange (20) is in sealing engagement with the underside of the shoulder (14). The internal surface of the skirt (18) carries an annular protuberance (52) which is in sealing engagement with one side surface of the flange (20). The other side surface of the flange is in sealing engagement with the outer surface of the neck (8), whereby an annular chamber (54) is defined by the inner surface of the skirt, the said one side surface of the annular flange, the protuberance and the hinge. A gas passage (50) is provided which extends between the annular chamber (54) and atmosphere.
patents
