WO1991016992A1 - Dispositif distributeur - Google Patents

Dispositif distributeur Download PDF

Info

Publication number
WO1991016992A1
WO1991016992A1 PCT/GB1991/000676 GB9100676W WO9116992A1 WO 1991016992 A1 WO1991016992 A1 WO 1991016992A1 GB 9100676 W GB9100676 W GB 9100676W WO 9116992 A1 WO9116992 A1 WO 9116992A1
Authority
WO
WIPO (PCT)
Prior art keywords
piston
cylinder
dispensing device
dispensing
fluid
Prior art date
Application number
PCT/GB1991/000676
Other languages
English (en)
Inventor
Geoffrey Brace
Richard John Warby
Original Assignee
Bespak Plc
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 Bespak Plc filed Critical Bespak Plc
Publication of WO1991016992A1 publication Critical patent/WO1991016992A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1038—Pressure accumulation pumps, i.e. pumps comprising a pressure accumulation chamber
    • B05B11/1039—Pressure accumulation pumps, i.e. pumps comprising a pressure accumulation chamber the outlet valve being mechanically opened after a defined accumulation stroke
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1042—Components or details
    • B05B11/1073—Springs
    • B05B11/1074—Springs located outside pump chambers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001—Piston pumps

Definitions

  • the invention relates to dispensing devices and more particularly to pump dispensing devices for dispensing fluids.
  • the invention is particularly, though not exclusively, suitable for dispensing liquid medicaments.
  • the dispensing device is capable of dispensing an accurately metered dose of the medicament at each use of the device.
  • the invention provides a pump dispensing device comprising a first piston sliding in a first cylinder, a second piston of smaller cross-section than the first piston sliding in the second cylinder, the first and second cylinders being in fluid communication, a fluid inlet to the cylinders and a fluid outlet through the first piston, valve means normally closing the fluid outlet and being opened in operation of the device, in which the second piston and cylinder define a metering chamber for the device, the second piston moving between first and second limit positions which define the volume of the metering chamber.
  • the first limit position of the second piston is defined by a physical abutment, the piston being spring urged into contact with the abutment.
  • the second limit position may be defined by a discontinuity in the bore of the second cylinder which allows fluid flow past the second piston.
  • the discontinuity preferably comprises a step in the bore, the step extending between the second cylinder and an extension of larger diameter.
  • Figure 1 is a longitudinal section through a pump dispensing device according to the invention, and showing the device in a first rest position;
  • Figure 2 is a view similar to Figure 1 showing the device in a second position
  • Figure 3 is a view similar to Figure 1 and showing the device in a ⁇ ird position
  • Figure 4 is another view similar to Figure 1 and showing the device in a fourth position.
  • a pump dispensing device 10 The device is designed to provide accurately etered doses of a product contained in a product container 20.
  • the product is provided to fill the dispensing device by known means.
  • the device is particularly suitable for dispensing liquid medicaments where it is important that accurately metered doses of the medicament are dispensed consistently.
  • the dispensing device comprises a first piston
  • the first piston 11 is a hollow generally cylindrical member having a tubular extension 18 which extends into a nozzle 21 of the dispensing device.
  • a first spring 22 is located between an internal shoulder of the nozzle 21 and a shoulder formed at the junction between the piston 11 and its tubular extension 18.
  • the nozzle 21 includes an insert 23 which defines with the nozzle an outlet passage 24 for product dispensed by the device.
  • the passage 24 terminates in a swirl chamber 25 formed between the nozzle and the insert so that product forced under pressure through the outlet passage 24 is dispensed in the form of a spray.
  • the upper end of the tubular extension 18 (as viewed in Figure 1) is spaced from the main portion of insert 23 and a cylindrical extension 27 of insert 23 extends axially through the tubular extension 18 of piston 11.
  • a valve member 28 normally closes off a flow path through the interior of piston 11 and is spring urged into its closed position by a second spring 29 located between the valve member and a resilient washer 30 at the lower part of cylinder 15.
  • the washer 30 overlies and normally closes inlet passages 31 formed in the piston housing 14 and extending through the wall of the housing at the junction between the first and second cylinders 15, 16.
  • a tubular projection 33 extends upwardly through resilient washer 30 and provides a location pin for the spring 29.
  • the piston housing 14 includes an annular flange portion 35 at its upper end which serves to locate the piston housing in a cup 36.
  • a first seal 38 is located between the upper surface of annular flange 35 and an upper end of assembly cup 36.
  • the first piston 11 extends slidingly through seal 38.
  • a second seal 40 is located between the lower surface of flange 35 and an upper end of a body member 41 to which the container 20 is fixed.
  • the cup 36 which is normally made of metallic material is crimped around body member 41 and flange 35 to maintain the components in assembled relation.
  • the piston housing 14 defines below the second cylinder 16 (as viewed in Figure 1) a tubular extension 43 of larger diameter than the second cylinder.
  • the second piston 12 includes an annular flange 44 which is a loose fit within the tubular extension 43.
  • a third spring 45 is located between annular flange ' 44 and an end plug 46 which fits in the tubular extension 43. Orifices 47 for flow of product are provided in the end plug 46 and the side walls of the tubular extension 43.
  • a tubular casing 50 for the dispensing device is fixed to an outwardly extending flange 51 of the nozzle 21.
  • the pump dispensing device 10 is shown in Figure 1 at its rest position. In use, the device is actuated by relative movements of the casing 50 and the product container 20 together with the components fixed thereto. This relative moment may be achieved by upward movement of the product container 20 as viewed in Figure 1 or by depression of the nozzle assembly 21 downwardly as viewed in Figure 1.
  • the first piston 11 slides downwardly in its cylinder 15.
  • the space defined in the first cylinder between the first and second pistons is filled with product and the downward movement of the first piston 11 causes the second piston 12 also to move downwardly in its cylinder 16.
  • the second piston defines with its cylinder a metering chamber 53 for the dispensing device 10.
  • the upper end of the stroke of the piston 12 is accurately controlled by contact between the piston 12 and the upper wall of cylinder 16.
  • the sealing lip 54 of the piston 12 has moved out of sealing contact with cylinder 16 and into the tubular extension 43 of the piston housing.
  • the third spring 45 then causes the second cylinder 12 to move upwardly forcing product through the outlet passage described above and through the swirl chamber 25 and thence out in a spray from the device. This discharge movement continues until the second cylinder 12 again reaches the upper limit of its movement controlled by contact between its sealing lip 54 and the upper wall of cylinder 16. The dose of product stored in the metering chamber 53 will then have been dispensed.
  • the user allows the dispensing device to return to its rest position by releasing the nozzle 21 and container 20 so that the nozzle 21 can move upwardly relative to the container 20 as viewed in the drawings.
  • the main product chamber defined by the first piston 11 and first cylinder 15 is recharged as shown in Figure 4.
  • Upward movement of the first piston 11 causes the resilient washer 30 to flex upwardly at its periphery thereby opening inlet 31 and allowing product to flow into the main chamber.
  • the first, second and third springs cause the remaining components to return to the position shown in Figure 1 and the dispensing device is then again ready for use.
  • the materials from which the various components of the dispensing device are made have not been described in general. It will be appreciated that most of the components of the dispensing device may be plastics mouldings.
  • the retaining cup 36 is generally of metal and it will be appreciated that the sealing washers 38, 40 and resilient washer 30 will be a suitable resilient sealing material.
  • the metering chamber which controls the volume of products dispensing by the device is very accurately defined. As described, this is achieved by movement of the second piston 12 being accurately controlled beween two limit positions defined by the second cylinder 16. It will be appreciated that the two features which control the movement of the second piston (i.e.
  • the limit of lower movement of the second piston 12 may be controlled by means other than the step in the bore of the piston housing 14.
  • a side hole in the cylinder wall might be provided to limit the movement of the piston or a physical stop for the piston may also be provided.

Landscapes

  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)

Abstract

On décrit un dispositif distributeur sous forme de pompe (10) servant à distribuer des fluides sous forme atomisée. Le dispositif possède un premier piston (11) monté pour glisser dans un premier cylindre (15), et un second piston (12), dont la section a une superficie moins grande, monté pour glisser dans un second cylindre (16), lesdits cylindres étant en communication fluidique l'un avec l'autre. Les cylindres possèdent un orifice d'entrée (31, 47) et le fluide est distribué par l'intermédiaire d'un orifice de sortie (24, 25) qui s'étend à travers le premier piston et jusqu'à un ajutage de sortie. Normalement, une vanne (28) obture l'orifice de sortie. Des ressorts (22, 29, 45) servent à pousser les éléments du dispositif vers leur position de repos. Une chambre de dosage dont le volume est fixe est formée par le second piston et le second cylindre, ce dernier pouvant se déplacer entre des limites définies par un palier situé à l'extrémité supérieure du cylindre (16) et par une discontinuité dans la paroi du cylindre.
PCT/GB1991/000676 1990-05-01 1991-04-29 Dispositif distributeur WO1991016992A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9009714.8 1990-05-01
GB9009714A GB2245936A (en) 1990-05-01 1990-05-01 Dispencing device

Publications (1)

Publication Number Publication Date
WO1991016992A1 true WO1991016992A1 (fr) 1991-11-14

Family

ID=10675246

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1991/000676 WO1991016992A1 (fr) 1990-05-01 1991-04-29 Dispositif distributeur

Country Status (3)

Country Link
AU (1) AU7752091A (fr)
GB (1) GB2245936A (fr)
WO (1) WO1991016992A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2795779A1 (fr) * 1999-06-30 2001-01-05 Valois Sa Pompe a precompression amelioree
EP4338847A1 (fr) * 2022-09-13 2024-03-20 Guangdong Neat Packaging Co., Ltd. Pompe de pulvérisation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761022A (en) * 1972-04-04 1973-09-25 H Kondo A spring pressure accumulative spray device
FR2452325A1 (fr) * 1979-03-27 1980-10-24 Yoshino Kogyosho Co Ltd Atomiseur actionne a la main, du type a reservoir
WO1987004373A1 (fr) * 1986-01-16 1987-07-30 Delaware Chemicals Corporation Pompe de refoulement du type sans etranglement

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES481770A1 (es) * 1979-06-21 1980-02-16 Marzabal Martinez Carlos Perfeccionamientos en los dispositivos dosificadores de li- quidos.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761022A (en) * 1972-04-04 1973-09-25 H Kondo A spring pressure accumulative spray device
FR2452325A1 (fr) * 1979-03-27 1980-10-24 Yoshino Kogyosho Co Ltd Atomiseur actionne a la main, du type a reservoir
WO1987004373A1 (fr) * 1986-01-16 1987-07-30 Delaware Chemicals Corporation Pompe de refoulement du type sans etranglement

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2795779A1 (fr) * 1999-06-30 2001-01-05 Valois Sa Pompe a precompression amelioree
WO2001002100A1 (fr) * 1999-06-30 2001-01-11 Valois S.A. Pompe a precompression amelioree
EP4338847A1 (fr) * 2022-09-13 2024-03-20 Guangdong Neat Packaging Co., Ltd. Pompe de pulvérisation

Also Published As

Publication number Publication date
GB2245936A (en) 1992-01-15
AU7752091A (en) 1991-11-27
GB9009714D0 (en) 1990-06-20

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