Abstract: A valve plate is manufactured by stamping round two-ply blanks out of two superimposed strips of material and shaping the valve plate out of the blanks while retaining the double ply. The plate is provided with a dome by this process. The outer ply is now provided with threading in the vicinity of the dome. If the plate is damaged when an adaptor is subsequently screwed onto it, the damage will be confined to the outer layer.

Abstract: A disposable oil drain pan and container combination features a large sidewall opening which is sealed by a removable screw cap. The oil pan and container combination is intended for use as (a) a container for new motor oil for purchase at a retail establishment, and (b) a disposable drain pan receptacle for use in changing oil in an automobile. The capacity of the container is preferably five quarts so that its contents can be emptied directly into the crankcase of an automobile during an oil change. After the contents have been emptied into the crankcase, the container assembly is set aside until time for the next oil change. At that time, the large screw cap is removed from the side of the container and the container is laid flat beneath the crank case so that the used oil can drain directly into the container through the sidewall opening. After the draining procedure has been completed, the cap is screwed on securely so that the filled container can be discarded.

Abstract: A shell forming the walls of a bat comprising a striking portion, an intermediate portion and a handle portion. The shell is filled with structural foam. The striking portion is closed by a weighted cap and the handle portion is closed by a knob. The cap and knob are secured to the shell by stud or by a connecting rod. The stud receiving device has a plurality of fins which extend outwardly therefrom. The fins fit in corresponding slots formed in either end of the bat. The stud receiving device is internally threaded as are the cap and knob. A threaded stud is then used to secure the cap and knob to their respective ends. The shell is over-wrapped with woven or braided composite-type materials, such as graphite, KEVLAR, glass and boron.

Abstract: A safety plastic filler neck for an automobile, vehicle, etc., that functions both to control the screwing torque and to prevent the fuel leakage from filler port through releasing a cap separable from the screw body. The screw body includes a flange disposed on its top portion, engaging/disengaging teeth formed at several locations along its outer circumference by extending the flange, a circular standing edge provided on the flange, latching teeth formed at several locations along the outer circumference of the circular standing edge which are to be latched in screwing direction, and incisions provided under the latching teeth and corresponding to them. The cap includes a rotation flange disposed on top of it, a round cover edge for covering the circular standing edge and the engaging/disengaging teeth of the screw body, latches formed on upper inner surface of the round cover edge, and an anchoring groove formed in lower inner surface of the round cover edge.

Abstract: A replaceable inspection plug assembly and method for its use with pressure vessels. The plug assembly comprises a collar seal welded onto a pressure vessel outer wall, and a threaded plug removably threaded into the collar and the vessel wall. The plug has a shoulder portion which is seal welded to the collar. For removal of the plug, the seal weld is first machined away using a special cup-shaped rotary machining tool. The plug is then cooled and contracted relative to the collar, and is then unscrewed and removed. Following inspection of the vessel interior, the plug is replaced in the threaded hole and the plug shoulder portion is rewelded to the collar to provide a structurally-rigid and leak-tight joint without need for subsequent stress relieving the welded joint.

Abstract: Disclosed are plugs and fasteners which deter unauthorized removal through the use of rotationally symmetric engagement recesses. The invention also provides special tools with projections complementary to the plug and fastener recesses and thereby permit easy removal of the plugs and fasteners without damage. An exemplary embodiment of an inventive plug contains a two-stage recess in lieu of the standard hexagonal head; each of the recess stages is rotationally symmetric, and the two stages have non-coinciding symmetry axes. The rotational symmetry of the recess stages defeats any attempt to remove an inserted plug by forcing commonly available tools, such as hex or square drivers and blade or Phillips screwdrivers, into the recess. An inventive tool for use with this embodiment has a two-stage projection complementary to the recess.

Abstract: The seal consists of a hollow stud member which is welded to the enclosure to be secured and a cap member which holds the enclosure cover in place when secured to the stud. The cap member has a body section and a pin element extending from it. The pin element has an end portion that is shaped so as to be permanently secured once it enters a receiving element in the stud member. The cap member further has a random identity element, such as a randomly wound coil mounted in a cavity within the cap body. One end of the identity element is fixed to the cap member body section and the other end is fixed to the pin element end portion; such that the identity of the identity element is altered when the end portion is broken away from the pin element.

Abstract: A container for vacuum packaging of products includes an outer container and an inner liner which conforms generally to the configuration of the outer container and is secured to the upper open end thereof while the remainder of the container and liner are unattached. A vent is provided between the atmosphere and the space between the container and liner so that the liner can expand and collapse as differential pressures are applied to the product sealed in the liner by a plastic film secured open end thereof.

Abstract: The disclosure is directed to a structure for mounting a cylindrical nozzle body on a pressure vessel body having an internal lining for corrosion resistance or other purposes, said nozzle body being of a material which cannot be welded to the pressure vessel body. The nozzle body is provided with a flange of recessed portion at its leading end directed into the pressure vessel, a stepped portion for abutment against a seating surface of the pressure vessel body at its periphery behind the recessed portion and a threaded portion for securing the nozzle body to the vessel at a periphery thereof rearwardly of the recessed portion.

Abstract: A fuel cap has a cover-handgripping portion and a threaded closure portion, which portions are maintained in assembly by a ring member. The ring member has integrally molded therewith a plurality of outwardly extending flexible fingers in a hinged relationship. The closure portion is inserted in the ring member prior to assembly within the handgripping portion. At assembly, the fingers of the ring member pivot inwardly at the hinge position to become engaged with an annular groove formed in the handgripping portion. The movement of the fingers results in an inner portion of the ring member being displaced to form a support shelf for the threaded closure. Engagement of the fingers with the groove portion of the handgrip prevents removal of the ring and therefore the closure member from the handgripping portion.

Abstract: A fuel cap assembly has a handgripping cover portion, a threaded closure portion and a ring portion. The ring portion has an inwardly facing lip for axially supporting the closure and a flexible skirt depending from the inwardly facing lip and terminating in an outwardly facing lip. The inwardly facing lip flexes outwardly during assembly of the closure into the ring and the skirt flexes inwardly during assembly of the ring and closure into the cover. An annular groove is formed in the cover at a location aligned with the outwardly facing lip such that the skirt can assume its unflexed position and thereby secure the fuel cap assembly.

Abstract: A container (20) disclosed includes a receptacle (22) and a cover (24) each of which includes a unitary member (26,28) molded from plastic. A helical thread (44) on the upper end of the receptacle side wall (30) and a helical thread (58) on a downwardly projecting lip (50) of the cover are engaged with each other in mating relationship by either threading of the cover onto the receptacle or by downward movement as the receptacle side wall and the cover lip flex to permit such engagement by a snap action. A retainer (46) on the receptacle side wall receives the lower edge (52) of the cover lip and a retainer (60) on the cover receives the upper edge (36) of the receptacle side wall so as to maintain the mating relationship of the threads with the cover in its closed position. The container has particular utility for use as a paint container especially when utilized with specific constructional features disclosed.

Abstract: A flexible cap, made of soft vinyl or rubber, slides over the ramp of the bleeder valve hex and grips tightly on the bleeder valve threads. The cap has matching threads molded into the cap inner wall. The cap is pushed over the bleeder valve and then screwed tightly against the brake housing face. Serrations on the cap sealing face may be filled with liquid sealant compressing against the casting. Vertical serrations are formed on the outer surface of the cap to provide a hand grip for screwing the cap in place.

Abstract: A molded, threaded port and plug may be produced in a container top in which a threaded port is defined at least in part by an inwardly projecting sleeve from the container top having first lateral aperture means, a plug threadedly mounted in the sleeve having an outwardly facing open recess defined by a tubular wall, and second lateral apertures communicating through the tubular wall. In one rotational position of the plug a flow channel is opened to the interior of the container, while in another rotational position of the plug the flow channel is sealed.

Abstract: In the final storage of radioactive substances in containers, these containers must be sealed so as to be gas-tight by means of a cover, before they are taken to the final storage place. In order to avoid thermal stress, which has up till now been customary, of the radioactive substances on the one hand and of the container and cover on the other hand, it is proposed that the container and the sealing cover should be suitably ground on their seating areas which cooperate with each other, and when the container is closed the cover is held by prestressing on the seating area of the container. In a preferred method, after grinding, a thin equalizing layer of a highly corrosion-resistant, deformable material is applied to at least one of the seating surfaces of the container and cover, in order to achieve a compensation for any roughness which may be present, which will improve the sealing, depending on the technically and/or economically possible extent of the grinding.

Abstract: A cap member has an annular wall extending from one side thereof. Interior threads are formed around the inside of said annular wall whereby the cap may be screwed to the exterior threads of a connector to close an opening. Two angularly spaced apart slots are formed through the annular wall of the cap member transverse to the axis thereof. The annular free edge of the wall next to each slot is deformed into each slot a small amount and a gap is formed through each of the deformed portions of the annular wall.

Abstract: A container is provided with an annular support flange, which can be flat or rise inwards in a frustum-defining manner. The flange is connected to the container contents-containing base portion in the vicinity of the lower edge of the cover when in the seated position. The flange's upwardly directed surface is smooth. The support flange is used for supporting the fingers during removal of the cover. The normally vertical periphery of the cover is constructed in such a way that upward slippage of the fingers is prevented.

Abstract: Apparatus and a process for permitting the fuel tank of a motor vehicle to be drained periodically to remove accumulated water, dirt and contaminated fuel. The apparatus includes a kit which includes an attaching member which is adapted to be attached to the lower outer portion of the fuel tank. The attaching member has a threaded hole through it and a bolt with a washer is provided which is adapted to be threaded into the hole. After the attaching member has been attached to the fuel tank a hole is drilled through the fuel tank in the central portion of the threaded hole in the attaching member. The bolt and washer effectively prevent leakage of fuel through this hole until the tank is to be drained.

Abstract: A vial for the storage of soil gas samples comprises a chamber having a passage extending away therefrom which serially defines a generally annular shoulder and a generally frustoconical surface each facing away from the chamber. A resiliently pierceable septum is positioned against the shoulder and a shaped plug is positioned against the generally frustoconical surface to provide a redundant seal.

Abstract: A resealable easy-opening container comprises an elongate body portion closed at a lower end and open at an upper end which includes a neck having an inner surface and a threaded outer surface, the container having means recessed within the body portion for the attachment of a handle, and a cover threadably connected to the neck of the container, the cover including a top panel having an upper surface and a lower surface; a cylindrical side wall depending from the lower surface of the top panel having a thread on the inside surface thereof for cooperating with the container neck threads; an annular sealing flange extending downwardly from the lower surface of the top panel for engagement with the inner surface of the neck; and gripping means comprising an elongate slot in the upper surface of the top panel and a plurality of vertical ribs about the cylindrical side wall.

Abstract: The cap of a centrifuge sample tube has a larger than usual bore therethrough to facilitate sample loading and unloading. Sealing of the larger bored is better than seals which can be achieved with the very narrow bores hitherto considered essential to minimize potential sources of leakage of sample from the tube.

Abstract: A double-seal, molded plastic screw cap for use with a solid cosmetic product, consisting of a resilient, cup-shaped plastic cap body having internal screw threads, the bottom rim of the body being engageable with an external shoulder of the container to effect a seal therewith. Above the screw threads, the side wall of the body has an inwardly raised, annular sealing bead adapted to slidingly and telescopically engage an outer annular surface of the container neck at the top rim thereof, to effect a second seal. A clearance chamber exists above the sealing bead, into which a portion of the cosmetic product can extend. The clearance chamber is characterized by thin walls, to effect a saving of plastic material. The sealing bead is effective independent of the exact axial positioning of the cap, and the bottom rim seal of the cap requires that the latter be tightly screwed onto the container.

Abstract: The invention is directed to a rubber sealed metal vacuum bottle comprising an inner shell and an outer shell; a U-shaped, circular rubber seal positioned between the throat portion of the inner shell and the upper end portion of the outer shell, said rubber seal having a U-shaped, circular metal reinforcing plate fitting therein, which reinforcing plate has two or more evenly spaced holes therethrough; and a circular supporting member fixed vertically between two inclined portions of the bottoms of the inner and outer shells. The invention is also directed to stopper caps for a metal vacuum bottle.

Abstract: A decomposition vessel comprises a rigid bucket of a plastic material resistant to chemical attack, totally enclosed in a supporting metal vessel which consists of a cylindrical supporting member and of a flat cap adapted to be screwed onto the supporting member so as to close the vessel tightly. Sealing means are provided between the opposed flat faces on the cap and the supporting member in the form of a sealing disc adjacent the flat cap and an outwardly exending flange integral with the rigid bucket in contact with the disc and with an upper planar face of the supporting member.

Abstract: A toroidal shaped container including a body made from tubing and formed into a ring is disclosed. The tube is bent so that the tube ends are aligned and spaced apart a distance with a closure piece inserted between the aligned ends and welded thereto to form a closed container. In a preferred embodiment the closure piece includes a boss projecting radially from the closure piece with an inwardly extending threaded aperture formed in the boss penetrating the interior of the pressure vessel.

Abstract: A method of mounting a mouthpiece onto a container which comprises fitting a tubular mouthpiece having an externally threaded portion and an annular leg portion of reduced thickness at the lower portion of the externally threaded portion, around an upright tubular portion formed integral with a top plate of the container, bending the upper end of the tubular portion outward to cause the bent edge of the upper end to hold the upper end of the mouthpiece from above, pressing outward from inside the lower end of the tubular portion and the said lower end leg portion of the mouthpiece both at a plurality of portions to form a plurality of projections at the lower end of the tubular portion and also the same number of recessed portions in the said leg portion of the mouthpiece, and causing the projections to engage with the recessed portions.

Abstract: A removable closure for a pressure container having an opening with a peripheral bead into which there is inserted a threaded neck member, the neck member being formed of a resilient plastic material adapted to expand and contract and having an interlocking engagement with the bead. The neck is provided with a radially extending handle portion by means of which the container is adapted to be carried and which also serves to prevent rotation of the neck member upon the application and threading of a cap to the neck member, the cap having a plug portion which enters into the opening in the neck member and being tapered wedges into the neck member and spreads the portion of the neck member which is in radial alignment with the bead portion, thus tightly forcing such portion against the bead to provide a high pressure seal.

Abstract: A tamper indicating closure for a threaded pouring spout having an external ratchet surface disposed near the base of the pouring spout is provided with a pawl-like member cooperating with the ratchet surface and maintaining integrity during closing but rupturing upon opening to give a visual indication that the container has been opened.

Abstract: A threaded closure having force-transmitting thread surfaces that face inwardly, whereby the forces acting on a casing wall directly above the closure imposed directly by a pressurized liquid and the forces on the casing wall adjacent to the closure transmitted from the top of the closure and through the closure threads are subtractive.

Abstract: An overcap assembly which is particularly suited for use in conjunction with spray-type cans having domed upper ends with annular beads surrounding a valve actuator. The overcap assembly includes a molded-plastic cup-shaped member adapted to be placed over the valve and an inverted, frusto-conical sleeve connecting the cap to the can in such a manner as to expose the valve when the cap is rotated. The sleeve has a pair of legs connected together by flexible webs providing fulcrums at diametrical locations. Lugs are provided on the lower ends of the legs to engage underneath the bead, and a helical groove is provided in the upper end of the sleeve. A cylindrical wall depends from the end wall of the cap and has a bead which engages in the helical groove. The webs of the sleeve are located closer to the top the cap than to the lugs at the bottom.

Abstract: A novel connection for a thermoplastic neck to a stub neck portion of a container, comprising a curl on the stub neck portion and a complimentary groove on the neck which cooperate to permit a portion of the neck below the curl to expand when a plug of the closure cap, which is threaded onto the neck, is inserted into the neck. The neck and neck portion have interlocking projections to prevent the neck from turning and the neck and cap having a novel thread arrangement which insures that the plug will properly enter into the neck and provide a good seal which could be frustrated if the neck was permitted to turn.

Abstract: This invention concerns plastic lids and pails having improved child-proof locking features. Intermittently placed teeth-like elements located on the pail and lid interlock to prevent the easy opening of the assembled pail and lid.

Abstract: A tightly fitting lid for a pail or bucket has a dispensing opening for discharge of the material contained in the pail and a child-resistant closure for the opening. The lid and pail constitute a package for particulate material. The lid and pail have co-operating rib and recess for retaining the lid on the pail. The lid opening is provided by a short "wide-mouth" neck which is threaded to mate with threads on the closure. The lid and closure have at least one interengaging stop and lug, respectively, which prevent the closure from being unscrewed. The closure can be removed after it is radially deformed in order to disengage the lug from the stop. The diameter of the closure is such that the closure lug cannot be disengaged from the stop by a child of tender years whose hand is too small to span the closure. The lid also has a plurality of horizontally extending webs surrounding and spaced from the closure for supporting a superposed pail.

Abstract: An improved closure and nozzle system for containers for air-curable materials such as cartridges for sealant and caulking compounds is disclosed. A container such as a caulking cartridge is provided with a threaded neck for attachment of a correspondingly threaded nozzle having a tapered tip portion designed to be cut off to provide a desired orifice size. A cap having a snap-fit ring is designed to mate with a corresponding snap-fit ring on the nozzle short of the tip and also having a threaded external portion designed to mate with the container neck so that the cartridge can be resealed after opening.

Abstract: A threaded access cover plate construction for boat decks, comprising a threaded fitting which is adapted to be secured to the deck, and a screw closure receivable in the fitting. Both the fitting and the closure have cooperable buttress-type threads which are dimensioned such that there is a relatively loose fit between the two parts. The rim of the fitting is in the form of a resilient upstanding skirt constituted of deformable material, the skirt being capable of yielding at selected points, due to its engagement by a centering shoulder of the closure. The yielding of the skirt permits improved seating of the closure, by minimizing the effect of interference between high points at the regions of contact of the two parts. Accordingly, a highly leak-resistant seal is established, even when the fitting or the closure has become slightly warped, or the fitting has been stressed to some extent by virtue of its being secured to the deck.

Abstract: A fuel tank cap assembly has a closure, a cover and a skirt. Each of these is an injection-molded component with the cover and skirt having interlocking portions which cooperate to maintain the cap assembled with a portion of the closure secured between the cover and skirt. Also secured between the cover and closure member is a pressure and vacuum valve assembly.

Abstract: A threaded lid for closing the opening in a pump housing having a body portion and a gripping formation defined by a ridge on the body portion having a central portion and projections extending beyond the central portion. A juncture between the central portion and each of the projections varies gradually from a rounded angle at one terminus of the juncture to a gently sloping ramp at the other terminus of the juncture, so that a simple elongated tool such as a stick may be placed between the projections of the gripping formation and rotated to loosen the lid, but not to tighten it. Furthermore, the mildly curved S-shape provides surfaces which conform to the hand to enable substantial manual loosening force to be applied comfortably to the lid, whereas the surfaces of the gripping formation engaged by the hand to tighten the lid are not conducive to the application of a substantial amount of manual force.

Abstract: A threaded access cover plate construction for boat decks, comprising a threaded fitting which is adapted to be secured to the deck, and a screw closure receivable in the fitting. Both the fitting and the closure have cooperable buttress-type threads which are dimensioned such that there is a relatively loose fit between the two parts. The closure has a centering shoulder which is engaged by the rim of the fitting whereby a self-centering of the closure takes place when it is screwed into the fitting. The loose fit and the sliding engagement of the flat surfaces of the buttress-type threads enable an unimpeded lateral shifting of the closure to occur as determined by the engagement of the centering shoulder on the closure and the rim of the fitting.

Abstract: A container (10) disclosed includes a unitary receptacle (12) and a unitary cover (14) which are each molded from resilient plastic with segmented buttress retainers (24, 32) that cooperate to secure the cover upon a snap action closing movement while permitting opening cover movement by manual rotation. The container has particular utility as a paint pail for holding paint, stain, or the like but is also useful for holding food or other contents. An upper open end on a side wall (16) on the receptacle has a round inner surface (23) on which circumferentially spaced sets of the buttress retainers (24) are located with horizontal retaining flanks thereof facing downwardly and inclined flanks thereof extending downwardly and radially in an inward direction to the associated retaining flanks.

Abstract: A specimen collection assembly comprising a cup member having a body portion and an open end closure portion. The assembly also includes a cap member having a closure portion adapted for engagement with the cup closure portion to effectuate a seal between the cap member and the cup member to thereby seal the interior of the cup body portion. The cup and cap members each have an outer protective wall thereon extending past and covering the outermost extremities of the closure portions of the cup and cap members to protect the closure portions from hand and body contact.

Abstract: An easy opening top closure member for a container having a top member with an aperture of a predetermined configuration. The closure member for the aperture has an exterior portion finger gripping structure, and intermediate portion in the form of a disc member that closes the aperture, and an interior portion in the form of a flange that is connected to the bottom of the disc member. The exterior portion finger gripping structure extends upwardly from the intermediate portion and functions to provide structure that can be gripped by the fingers of the person opening the top closure member by a rotational twisting motion.

Abstract: Container closure spout construction, e.g. for incorporation in a metal drum container, including a container wall portion having a spout aperture, and a closure spout member having a peripheral substantially transversely extending flange portion and, preferably integral therewith, an intermediate substantially axially extending tubular, e.g. internally threaded central hollow cylindrical, portion defining a closure spout opening within the flange portion and adapted to receive removably a cooperating closure element such as a plug or cap thereat, in which the spout member is disposed at the spout aperture in engagement with the adjacent marginal portion of the container wall portion thereat, and a high energy concentration beam, e.g. laser beam, produced weld seam, preferably continuously, interconnects the spout member with the container wall portion along such adjacent marginal portion;the weld seam preferably being provided by subjecting the site of interconnection of the component, e.g.

Abstract: The invention consists of a screw cap assembly including a manually operable handle piece rotatable in both directions, a cylindrical case mechanically coupled with the handle piece for unitary rotation therewith, a key-operable cylinder lock mounted in the cylindrical case and capable of rotating only partially and independently therefrom when key-operated from outside, and a screw plug proper operably connected with the handle piece through the cylindrical case. The plug can be rotated in both screw-advancing and screw-retracting directions when the cylinder lock is key-operated to its unlocked position but only in the screw-advancing direction when the lock is in its locked position.

Abstract: A snap together fuel cap wherein a closure member is maintained between a cover portion and a skirt portion. The cover and skirt portions are secured together through cooperating axially facing surfaces formed on locking tab members. The tabs on the skirt have a predetermined width which is slightly less than the distance between adjacent protruding surfaces formed on the cover such that after assembly, the end walls on the skirt tabs will engage the edges of the protruding surfaces to limit relative rotation between the cover portion and the skirt portion.

Abstract: Disclosed is a container for storing product and a process and apparatus for making the container. The container comprises a paperboard outer container and a plastic inner container which has been drawn and blow formed into the outer container. The container is characterized by plastic screw threads which extend from the plastic inner container around the upper portion of the outside of the paperboard outer container. The screw threads permit a cap to be screwed onto the container after product, e.g. food, is placed in the container. The screw threads are vacuum formed, preferably simultaneously with the blow forming of the plastic inner container.

Abstract: The present invention pertains to releasable locking mechanism for a hollow circular member such as a fill pipe for an oil tank and cup-shaped closure cap of non-magnetic material which is connectable to the hollow circular member, in combination with a locking member of ferrous material supported by said cap for axial movement vertically relative to the cap and hollow circular member but non-rotatable relative to the cap, one end of the locking member having a configuration that is engageable with the hollow circular member in non-rotatable relationship to prevent rotation of the cap with respect to the hollow circular member when the locking member is in the latter position, the locking member being adapted to be raised from said locking engagement with the hollow circular member by a magnet which may be mounted within a wrench for use with the cap to remove the same from the hollow circular member.

Abstract: A retainer assembly for sealingly securing a fuel level sending unit or other fuel tank wall mounted device to a portion of the fuel tank wall is provided which includes a retaining member which threadedly engages the tank wall in a ratcheting manner and compressively engages a seal carried between the unit and the tank.

Abstract: A plastic closure is disclosed which has an integral sealing means formed by an annular resiliently deflectable V-shaped wall section with a downwardly and outwardly projecting corner on it for sealing against an upwardly facing sealing surface on a container. The closure also has a stop member projecting downwardly and inwardly from near the top of the closure skirt for engagement against the container mouth during application of the closure on a container to arrest the axial travel of the closure on the container. The closure may have paraffin or wax lubricant either in the plastic material of the closure or on the inside surface to reduce the torque required to seal the closure on a container.

Abstract: The disclosure relates to a lens case for supporting a pair of contact lenses in a liquid solution to be heated to an elevated temperature for effecting sterilization or disinfecting of the lenses. The lens case includes a generally cylindrical open ended container for housing the liquid, a cap for closing the open end of the container, and a lens holder arrangement for supporting the lenses to be sterilized. The cap includes means for supporting the lens holder and the lenses confined therein emersed within the liquid. Further, said cap includes a circumferential downturned annular flange that forms a recess within the cap to provide an air pocket and an area which provides an expansion chamber for the liquid. More specifically, upon assembly of the cap to a filled container, the air pocket will displace excess liquid from the container as the cap is assembled in place.

Abstract: A flange for a container opening has an internally threaded aperture to receive a plug, and a plurality of external serrations in a circularly spaced-apart relationship around the periphery of the upper portion of the flange. The plug is externally threaded and, when mated with the flange, closes the aperture. Both the flange and the plug are molded out of plastic material as single integral components. On the lower portion of the flange is an annular lip which is positioned beneath and extends radially beyond the external serrations. A container suitable for the flange has a boss around the container opening in a wall (usually the end wall) of the container. The boss is formed with internal serrations equal in number to the number of external serrations on the flange. This boss can be crimped onto the flange placed in the opening, such that the two groups of serrations permanently interlock with one another thereby securely locking the flange into the container.