EP0116478A2 - Récipient de distribution de fluides sous pression - Google Patents

Récipient de distribution de fluides sous pression Download PDF

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Publication number
EP0116478A2
EP0116478A2 EP84300989A EP84300989A EP0116478A2 EP 0116478 A2 EP0116478 A2 EP 0116478A2 EP 84300989 A EP84300989 A EP 84300989A EP 84300989 A EP84300989 A EP 84300989A EP 0116478 A2 EP0116478 A2 EP 0116478A2
Authority
EP
European Patent Office
Prior art keywords
container
piston
propellant
rivet
wall
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP84300989A
Other languages
German (de)
English (en)
Other versions
EP0116478A3 (fr
Inventor
Harvey W. Kirby
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0116478A2 publication Critical patent/EP0116478A2/fr
Publication of EP0116478A3 publication Critical patent/EP0116478A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/14—Containers or packages with special means for dispensing contents for delivery of liquid or semi-liquid contents by internal gaseous pressure, i.e. aerosol containers comprising propellant for a product delivered by a propellant
    • B65D83/60—Contents and propellant separated
    • B65D83/64—Contents and propellant separated by piston

Definitions

  • This invention relates to pressurized fluid dispensing containers.
  • the usual type of container is a rigid, cylindrical can filled with a liquid product to be dispensed and a propellant.
  • the container is provided with a valve, usually finger actuated, which, when operated, dispenses a mixture of the product and the propellant.
  • the pressure of the propellant provides the dispensing force.
  • barrier-type containers employing diaphragm means to separate the product and propellant.
  • One such container utilizes a sliding piston, snugly fitting the container body. Accordingly, the container is divided into two sections, an upper product chamber and a lower propellant chamber.
  • Another manner of separating product and propellant involves the use of a flexible inner container or bag forming a barrier between the product and the pressure fluid.
  • the product is contained in the flexible inner container while the propellant occupies the space between the inner container and the walls of the container.
  • the containers utilizing a piston or flexible inner container generally are characterized by a propellant fill hole situated at the bottom end wall of the container. Once the product is charged into the upper product chamber and the propellant into the lower propellant chamber, this opening must be sealed.
  • Containers on the market today utilize a plastic or rubber bung to seal the propellant fill hole at the bottom end wall. This manner of sealing has not proven to be highly successful particularly where .the product is of a highly viscous nature, for example with a viscosity of 20 cp or more at 20°C. As such products require high pressure propellants, containers sealed in this manner are prone to leaking at the bung. Further they are vulnerable to tampering and vandalism, as the bung can be pried open with the fingers, releasing the propellant and rendering the container useless.
  • the invention provides a pressurized fluid dispensing container having: a rigid, hollow cylindrical body, top and bottom end walls, a diaphragm means positioned between said end walls, thereby defining an upper fluid product chamber and a lower propellant charge chamber, said top end wall having an opening provided with a dispensing valve, said bottom end wall defining a. propellant fill opening and having a sealing means in said fill opening, said sealing means comprising a closed-end blind rivet having undergone radial expansion upon actuation from the outside of the bottom end wall and thereby forcing the perimeter of the body and the head of said rivet' into tight sealing arrangement with the bottom end wall.
  • a closed end blind rivet as sealing means offers a more secure seal than the plastic or rubber type bungs.
  • the invention provides a pressurized fluid dispensing container having: a hollow cylindrical body; top and bottom end walls; said top end wall having an opening for a dispensing valve; and a free-floating piston slidable vertically within the body and having a generally cylindrical relatively rigid side wall provided with upper and lower relatively resiliently flexible annular vanes sealing between the side wall of the piston and the inner side of the body, said vanes being relatively thin compared to the material of the cylindrical side wall, and the upper vane inclining upwardly away from the piston outwardly toward the body and the lower vane inclining downwardly away from the piston outwardly toward the body.
  • the upwardly and outwardly angled vane reduces any tendency for the viscous product to travel downwardly toward the propellant chamber, while the downwardly and outwardly directed vane reduces any tendency for propellant to seep past the sides of the . piston during the initial propellant-introduction step. Such seepage of propellant into the upper, product chamber could tend to force a viscous product downwardly past the side of the piston.
  • the arrangement also reduces the risk ..of intermixing of product and propellant as a result of displacement of the piston laterally within the container.
  • a pressurized fluid dispensing container 10 illustrated in Figure 1 comprises a rigid hollow cylindrical body 1 and a top end wall 2, having an upper opening sealed with a conventional form of closure 3 provided with a dispensing valve arrangement 4.
  • the container has a bottom end wall 5, defining a propellant fill opening 6.
  • a piston 7 Positioned between end walls 2 and 5, is a piston 7 shown somewhat schematically. Accordingly there is a defined upper product chamber 9, and a lower propellant chamber 8.
  • a product e.g. a high viscosity product is injected through the upper opening in the top end wall 2, into the product chamber 9.
  • the closure 3 with the dispensing valve arrangement 4 is sealingly mated to the top end wall.
  • the container is then pressurized by charging a propellant gas into the lower propellant chamber 8 with an appropriate propellant through opening 6. After charging, the propellant fill opening 6 is immediately sealed with a closed end blind rivet 11.
  • the closed end blind rivet 11, shown in Figure 1 is in the actuated position, namely, the perimeter of the body 12, and the head 13, of the rivet 11 are in'tight sealing arrangement with the bottom end wall 5, of the container 10.
  • FIG. 2 shows the detail of a typical closed end blind rivet inserted in opening 6 and before actuation.
  • the closed end blind rivet shown is of a hollow-core type.
  • Closed end blind rivets comprise a body 12, which in the present application projects up into the propellant chamber 8, a head 13, and a mandrel 14, which is used to actuate the rivet.
  • Figure 3 is an illustration of the actuated closed end blind rivet 11, inserted in the propellant fill opening 6.
  • the mandrel 14 is withdrawn from the body of the rivet in the direction shown by the arrow.
  • a high degree of radial expansion is generated in the rivet body thus forcing the perimeter of .the rivet body against the inner surface of the bottom end wall.
  • the head of the rivet is forced in tight sealing arrangement with the outside of the bottom- end wall, thus a hole filling seal which is gas and liquid tight is provided.
  • a wide range of rivets is available in various sizes, materials, and manner of construction.
  • a closed end POP (registered trade mark) rivet as available from USM Limited, fastener Division, Montreal, Quebec, Canada, and consisting of an aluminum body and a carbon steel mandrel may be employed.
  • a tight sealing arrangement is obtained when the body of the closed end blind rivet comprises a substance, for example aluminum, which is softer than and flows plastically at a lower stress than the steel used for the bottom wall 5, so that as the rivet is shortened longitudinally and swelled radially, as shown in Figure 3, the steel bottom wall 5 bites into and embeds itself in the rivet, forming a tight seal.
  • a cup-shaped enclosure may be positioned below the bottom wall of the can.
  • the rim of the cup is provided with an O-ring gasket.
  • a blind rivet actuating gun of conventional type is supported for vertical reciprocation in the cup, and is controlled by control lines, e.g. compressed air lines, passing in gas-tight manner through the wall of the cup.
  • control lines e.g. compressed air lines
  • pressurizing gas e.g. nitrogen
  • a blind rivet is introduced into the gun, the container 1 is clamped in position, the cup is pressed upwardly so that its O-ring gasket forms a gas-tight seal with the wall 5, and pressurizing gas is passed into the cup until a desired quantity enters the propellant chamber of the container through the hole 6.
  • the rivet actuating gun is then moved upwardly within the cup to introduce the body 12 of the rivet into the hole 6 and to press the head 13 of the rivet tightly against the wall 5.
  • the mandrel 14 is then pulled down by jaws within the gun, to actuate the rivet to the radially swelled condition shown in Figure 3 .
  • the cup and gun are then lowered, the mandrel 1 4 is removed, the pressurized container is released and removed, and then the above-described operation may be repeated with a fresh container.
  • the body of the rivet 12 may be coated with a curable liquid resin composition before the rivet is pushed into the hole 6.
  • the coating may cover the top surface of the rivet body 12, and may extend some way downwardly over the sides.
  • a thin film of the resin becomes smeared over the contacting surfaces of the rivet 12 and the periphery of the hole 6 and cures after the actuation of the rivet to provide a seal.
  • the coating may be, for example, flowable curable mixture of an epoxy resin and a hardener therefor.
  • Figures 4 to 6 show a piston 41 formed as a one piece moulding from resiliently flexible plastic e.g. high density polyethylene.
  • the piston 41 is in the form of a hollow cylindrical cup with a domed upper side 42 provided with an integrally-formed central depression 43 which accommodates the lower portion 4a of the dispensing valve 4 when the piston 41 is driven upwardly in dispensing the last of the product 44 indicated somewhat schematically in the left hand half of Figure 4.
  • the product 44 is contained within an upper product chamber 45 defined above the piston 41.
  • the outer cylindrical wall of the piston 41 is provided adjacent its upper end with a set of two vertically spaced upwardly and outwardly inclining annular vanes 46.
  • a lower set of two annular vanes 47 Spaced downwardly from the upper set of vanes, but upwardly from a lower edge 48-of the piston, is a lower set of two annular vanes 47 also integrally formed with the side wall of the piston 41 and inclining downwardly and outwardly therefrom.
  • the vanes 46 and 47 are each moulded integrally with the side wall of the piston, and are moulded as annular membranes. As best seen in Figure 6, the vanes 46 and 47 are moulded with a lesser thickness than the side wall of the piston 41, so that they are relatively more flexible.
  • the side wall of the piston 41 above, below and between the vanes is of constant diameter.
  • the length of the side wall of the piston 41 contacting the body 1 is preferably at least half the width or diameter of the piston, thus making it more stable when positioned within the container body 1, and less liable to tip or tilt to one side when propellant gas is introduced into a propellant chamber 49 defined between the piston 41 and the lower wall 5.
  • the cylindrical skirt portion of the piston below the lower set of vanes 47 is formed with apertures.
  • the apertures take the form of vertically-extending slots 50 extending upwardly from the lower edge.
  • the piston 41 is driven upwardly, compressing the viscous product 44 trapped in the product chamber 45. Any tendency for the product to be displaced downwardly past the side of the piston 41 is prevented by the upwardly and outwardly inclining vanes 46 which tend to be flexed radially outwardly by their reaction with the viscous product, thus tending to resiliently expand or flex them outwardly and thus .improving the sealing contact between the vanes and the inside of the wall of the body 1. Similarly, the pressure exerted by the propellant gas on the lower vanes 47 tends to resiliently expand or flex them outwardly into more effective sealing contact with the wall of the body 1. This avoids any tendency for mixing of the propellant and product, which would lead to loss of the capability of the propellant gas fill to sustain a pressure differential between the propellant and product chambers 49 and 45.
  • each set 46 and 47 a plurality of vertically spaced vanes is provided in each set 46 and 47.
  • the side wall of the piston 41 In the event that the wall of the body 1 is damaged or dented and permanently deformed inwardly, there would be a tendency for the side wall of the piston 41 to be deflected inwardly, as the side wall may be unable to withstand the inwardly-directed pressure such as might be exerted on it by a deformed region of the wall of the body 1.
  • each set of vanes 46 and 47 comprises at least two vertically spaced vanes. A larger number of vanes in each set may be employed if desired.
  • vanes in each set 46 or 47 may act as a back-up resisting any tendency for failure of the seal.
  • a negative pressure differential may tend to be created between the lower chamber 49 and the upper chamber 45, such as would tend to result in product moving downwardly from chamber 45 to chamber 49. Any such tendency is resisted by the upwardly and outwardly inclining set of vanes 46.
  • each vane in the sets 46 and 47 is moulded so that, in the as-moulded condition, it defines an acute angle with the adjacent portion of the side wall of the piston 41 of from about 30° to about 50°, more preferably about 40°.
  • each of the vanes in the sets 46 and 47 is moulded so that it is slightly oversize as compared with the inside diameter or bore of the container body 1 i.e. when inserted in the body 1, it reacts with the inner surface of the side wall of the body 1, and is under a slight inwardly-directed compressive stress.
  • Typical examples of viscous fluids 44 to be dispensed include caulking materials.
  • the product will usually have a viscosity of at least 20 cp at 20°C, more usually greater than 50 cp. Viscosities of 2000 cp and above are contemplated for some of the more viscous caulking materials which may be dispensible with the preferred arrangements.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Nozzles (AREA)
EP84300989A 1983-02-15 1984-02-15 Récipient de distribution de fluides sous pression Withdrawn EP0116478A3 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US46660283A 1983-02-15 1983-02-15
US466602 1983-02-15
US51118683A 1983-07-06 1983-07-06
US511186 1983-07-06
US52317383A 1983-08-12 1983-08-12
US523173 1983-08-12

Publications (2)

Publication Number Publication Date
EP0116478A2 true EP0116478A2 (fr) 1984-08-22
EP0116478A3 EP0116478A3 (fr) 1985-09-11

Family

ID=27412994

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84300989A Withdrawn EP0116478A3 (fr) 1983-02-15 1984-02-15 Récipient de distribution de fluides sous pression

Country Status (1)

Country Link
EP (1) EP0116478A3 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0235583A1 (fr) * 1986-02-06 1987-09-09 STACOS di Saulle Lorenzo e Pontarollo Luciana S.n.c. Distributeur pour produits fluides
EP0523606A1 (fr) * 1991-07-17 1993-01-20 United States Can Company Boîte d'aérosol à piston coulissant
FR2714363A1 (fr) * 1993-12-23 1995-06-30 Oreal Ensemble de distribution comprenant un récipient cylindrique comportant un piston à deux lèvres.
US5441181A (en) * 1994-08-09 1995-08-15 Scheindel; Christian T. Piston with a flexible wipe
GB2375800A (en) * 2001-05-24 2002-11-27 Tetrosyl Ltd An aerosol dispenser containing a de-coking formulation

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1394469A (fr) * 1964-04-16 1965-04-02 Pulvérisateur à piston
GB1014841A (en) * 1960-12-19 1965-12-31 American Can Co Method of charging and sealing containers of the aerosol type and machine for carrying out said method
FR2066560A5 (fr) * 1969-10-29 1971-08-06 Alusuisse
FR2151366A5 (fr) * 1971-08-26 1973-04-13 Schultz Robert
US3827212A (en) * 1972-11-10 1974-08-06 Eyelet Specialty Co Tool for sealing a pressure-operated dispensing container

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE864447R (fr) * 1977-06-17 1978-09-01 Schumacker Therese F A Dispositif pour distribuer un liquide sous forme finement divisee

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1014841A (en) * 1960-12-19 1965-12-31 American Can Co Method of charging and sealing containers of the aerosol type and machine for carrying out said method
FR1394469A (fr) * 1964-04-16 1965-04-02 Pulvérisateur à piston
FR2066560A5 (fr) * 1969-10-29 1971-08-06 Alusuisse
FR2151366A5 (fr) * 1971-08-26 1973-04-13 Schultz Robert
US3827212A (en) * 1972-11-10 1974-08-06 Eyelet Specialty Co Tool for sealing a pressure-operated dispensing container

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0235583A1 (fr) * 1986-02-06 1987-09-09 STACOS di Saulle Lorenzo e Pontarollo Luciana S.n.c. Distributeur pour produits fluides
US4877157A (en) * 1986-02-06 1989-10-31 Stacos Di Saulle Lorenzo E Pontarollo Luciana S.N.C. Dispenser for fluid products
EP0523606A1 (fr) * 1991-07-17 1993-01-20 United States Can Company Boîte d'aérosol à piston coulissant
FR2714363A1 (fr) * 1993-12-23 1995-06-30 Oreal Ensemble de distribution comprenant un récipient cylindrique comportant un piston à deux lèvres.
US5441181A (en) * 1994-08-09 1995-08-15 Scheindel; Christian T. Piston with a flexible wipe
GB2375800A (en) * 2001-05-24 2002-11-27 Tetrosyl Ltd An aerosol dispenser containing a de-coking formulation
GB2375800B (en) * 2001-05-24 2003-11-05 Tetrosyl Ltd Aerosol dispenser

Also Published As

Publication number Publication date
EP0116478A3 (fr) 1985-09-11

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Effective date: 19860512