EP0666219A1 - Dispositif de distribution - Google Patents
Dispositif de distribution Download PDFInfo
- Publication number
- EP0666219A1 EP0666219A1 EP95300599A EP95300599A EP0666219A1 EP 0666219 A1 EP0666219 A1 EP 0666219A1 EP 95300599 A EP95300599 A EP 95300599A EP 95300599 A EP95300599 A EP 95300599A EP 0666219 A1 EP0666219 A1 EP 0666219A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve member
- cylindrical extension
- core
- spring
- chamber
- 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.)
- Granted
Links
Images
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
- B05B11/0005—Components or details
- B05B11/0037—Containers
- B05B11/0039—Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means
-
- 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
- B05B11/0005—Components or details
- B05B11/0037—Containers
- B05B11/0039—Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means
- B05B11/0044—Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means compensating underpressure by ingress of atmospheric air into the container, i.e. with venting means
- B05B11/00442—Containers associated with means for compensating the pressure difference between the ambient pressure and the pressure inside the container, e.g. pressure relief means compensating underpressure by ingress of atmospheric air into the container, i.e. with venting means the means being actuated by the difference between the atmospheric pressure and the pressure inside the container
-
- 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
- B05B11/1016—Piston pumps the outlet valve having a valve seat located downstream a movable valve element controlled by a pressure actuated controlling element
- B05B11/1018—Piston pumps the outlet valve having a valve seat located downstream a movable valve element controlled by a pressure actuated controlling element and the controlling element cooperating with means for opening or closing the inlet valve
Definitions
- This invention relates to pump dispensers of the type used to dispense liquid from a container in aerosol spray form.
- a spring acting on the valve member also serves to limit relative displacement of the cylindrical extension relative to the valve member throughout the stroke of the pump and in the rest position of the pump both the cylindrical extension and the valve member make contact with an extremity of the spring.
- apparatus for dispensing liquid from a container comprising a piston slidable in a cylinder to vary the volume of a chamber defined therein, a tubular stem integral with the piston and extending outwardly of the chamber to define a liquid delivery duct, a valve member slidably received in the stem and co-operable therewith in a rest position to close the delivery duct, the valve member having a separately formed cylindrical extension defining an inner wall of the chamber and having an outer periphery slidingly engaging an internal surface of a tubular extension of the cylinder, the cylindrical extension defining a conduit communicating in use with the container, a spring extending through the conduit and acting on the valve member to bias the valve member into the rest position, and connecting means providing lost motion between the valve member and the cylindrical extension whereby the valve member and the cylindrical extension are movable into and out of engagement to respectively close and open a liquid inlet port defined therebetween and communicating between the conduit and the first chamber, wherein the connecting means comprises co-operating stop formations of the
- valve member and the cylindrical extension can be pre-assembled as a sub-assembly thereby simplifying the assembly of the apparatus.
- the spring can thereby be introduced into the apparatus at a subsequent stage of assembly.
- An advantage of the spring extending into the annular space between the core and the cylindrical extension is that the presence of the core holds the spring in coaxial alignment with the valve member and the spring in turn provides a support for maintaining coaxial alignment of the cylindrical extension. This nested arrangement helps to prevent misalignment and subsequent jamming of the cylindrical extension and valve member and also helps to prevent buckling of the spring.
- the spring acts on the stop formation of the valve member.
- stop formation defines both the limit of lost motion of the valve member and cylindrical extension and at the same time provides a point of contact between the spring and the valve member.
- the spring prefferably be a helical compression spring and its resistance to buckling under compressive load depends to some extent on the diameter of the spring relative to its length.
- the above arrangement in which the spring extends externally of the core thereby provides for the maximum available diameter helical spring to be utilised with resulting stability.
- valve member comprises a core extending within the cylindrical extension, the core comprising an interrupted annular outwardly projecting annular flange co-operable with an inwardly projecting annular flange of the cylindrical extension, the outwardly and inwardly projecting flanges thereby constituting the stop formations of the connecting means.
- the interrupted flange thereby defines axially extending channels through which liquid can flow freely through the conduit.
- a further advantage is that thrust transmitted from the valve member to the cylindrical extension by contact between the flanges is circumferentially distributed thereby avoiding any tendency of the cylindrical extension to move out of coaxial alignment with the valve member. Such misalignment could otherwise interfere with the proper operation of the apparatus by inhibiting relative movement between the core and the cylindrical extension.
- a helical spring tends to apply thrust locally to the cylindrical extension in a manner which tends to wedge the cylindrical extension against the core of the valve member with a consequent tendency to jam.
- the apparatus of the present invention by avoiding the problem of jamming, thereby achieves improved reliability in opening and closing of the liquid inlet port and thereby achieves greater consistency in the performance of the apparatus.
- a further advantage of the apparatus of the present invention is to provide greater flexibility in the choice of critical design parameters relevant to the performance cf the pump by allowing the diameter of the cylindrical extension to be independent of the spring diameter since it is no longer a requirement for the spring to make contact with both the valve member and the cylindrical extension.
- the core may comprise a plurality of circumferentially distributed parallel legs, the outwardly projecting flange being interrupted by axially extending flow channels defined between the legs.
- the legs are resiliently deformable so as to move radially relative to the core axis during assembly of the core with the cylindrical extension by means of ramp formations formed on one or other of the legs and the cylindrical extension.
- the core may comprise a central portion with circumferentially distributed axially extending recesses defining flow channels.
- Such a core may be of cruciform radial cross section.
- valve member is co-operable with the stem to define a closable liquid outlet port at a location defined by contact between a tip portion of the valve member and an annular valve seat of the stem.
- the liquid outlet port is defined at a location remote from the chamber and adjacent to the discharge nozzle of the apparatus.
- the volume of residual liquid retained downstream of the liquid outlet port after use is thereby minimised.
- an apparatus 1 has a pump 2 constituted by a piston 3 which is axially movable in a chamber 4 defined by a cylinder 5.
- a stem 6 formed integrally with the piston 3 is tubular so as to define a liquid delivery duct 7 through which liquid content of the chamber 4 is expelled during a dispensing stroke during which the stem moves downwardly towards the cylinder 5.
- the stem 6 constitutes an actuating member for effecting movement of the piston 3.
- a valve member 8 extends axially within the liquid delivery duct 7 and is axially movable into and out of engagement with an annular valve seat 9 constituted by a radially inwardly projecting flange 10 of the stem 6.
- the valve member 8 has an associated cylindrical extension 11 defining a conduit 60 and which is formed separately from and is axially movable relative to an enlarged lower portion 12 of the valve member.
- the enlarged lower portion 12 and the valve member 8 are upwardly biassed by a coil compression spring 13 such that a tip portion 18 of the valve member cooperates with the valve seat 9 to form a liquid outlet valve (18,9) which is normally closed as shown in the rest position in Figure 1.
- the apparatus 1 has an actuator 20 having a stem engaging portion 21 defining an axial bore within which an end portion 24 of the stem 6 is received as a tight fit thereby securing the actuator 20 in fixed relationship to the stem 6.
- a depending skirt 27 of the actuator is spaced radially outwardly of the stem engaging portion 21.
- the actuator 20 further defines a radially extending bore 29 which defines a dispensing channel 30 through which liquid is dispensed so as to emerge from a nozzle aperture 31 defined by a nozzle 32 located in the bore.
- the cylindrical extension 11 has a lower end portion 14 which is slidingly engaged with an internal surface 15 of a tubular extension 16 depending from the cylinder 5 and the tubular extension 16 is connected to a dip tube 17 through which liquid is drawn from a container 107.
- the tubular extension 16 is of smaller diameter than the cylinder 5 such that an annular volume constituting the chamber 4 is defined between the cylinder and the cylindrical extension.
- the lower end portion 14 is maintained in continuous sliding engagement with the inner surface 15 throughout the entire stroke of the apparatus 1.
- the cylindrical extension 11 defining conduit 60 is captively retained in coaxial relationship with a core 102 integral with the lower portion 12 of the valve member 8, cooperating annular flanges 103 and 104 being provided on the cylindrical extension 11 and the core 102 respectively.
- the flanges 103 and 104 constitute co-operating stop formations of the cylindrical extension and the core respectively, being operable to limit axial separation of the cylindrical extension 11 from the enlarged lower portion 12 of the valve member 8.
- the flange 104 is interrupted by gaps allowing liquid flow.
- the upper end portion of the spring 13 extends into an annular space defined between the core 102 and the cylindrical extension 11.
- the spring 13 is nestedly received in sliding contact with both the core 102 and the cylindrical extension 11, thereby being supported in coaxial alignment with the core and hence the valve member 8 and at the same time supporting the cylindrical extension in coaxial alignment with the core. In this way misalignment of the cylindrical extension is avoided and alignment of the spring is maintained in order to avoid buckling under compressive load.
- the coil compression spring 13 contacts the core 102 and biases the core into the position shown in Figure 1 such that in the rest position the stem 6 projects fully in a direction away from the chamber 4 and the actuator 20 is in its fully raised position.
- the liquid inlet port 105 is closed as shown in Figure 2 allowing liquid pressure to be built up within the chamber 4 as the piston 3 moves into the chamber 4 thereby decreasing the volume of the chamber.
- Excess pressure in the chamber 4 results in movement of the valve member 8 relative to the stem 6 such that it becomes unseated from the seat 9 and liquid is dispensed under pressure through the liquid delivery duct 7. This movement is achieved by an imbalance of axial forces acting on the valve member 8 due to the enlarged lower portion 12 having a greater cross section than the tip portion 18 so that there is an imbalance between the upper and lower surface areas of the valve member to which liquid pressure is applied.
- liquid is thereby pumped such that pressurised liquid is expelled via the dispensing channel 30 so as to emerge in atomised form from the atomising nozzle 32.
- FIG 1 the apparatus 1 is shown connected to the container 107 by means of a screw fitting 44, the container having in its normal orientation as illustrated in the Figure 1 a quantity of liquid contained in its lower portion and a volume of air occupying a head space 108.
- the cylinder 5 and tubular extension 16 are formed integrally with a body 42 which is connected to a casing 43 of the apparatus 1 which includes the screw fitting 44 for connection to the container 107, the casing being formed integrally with an annular seal member 45 through which the stem 6 is axially slidable.
- the casing 43 further includes a tubular skirt engaging portion 46 projecting upwardly into telescopic engagement with the depending skirt 27, the skirt 27 being slidably received in engagement with an internal cylindrical surface 47 of the skirt engaging portion.
- the volume of the chamber 4 is reduced to an absolute minimum at the completion of the actuating stroke by shaping the valve member 8 to be conformal to the interior of the piston 3 and by virtue of the constructional features of the cylindrical extension 11 and lower portion 12 of the valve member.
- a high compression ratio of the pump 2 is thereby achieved and this facilitates the priming of the chamber 4 with liquid.
- Figure 5 illustrates a modified apparatus 50 in which the body 42 is securable to a container (not shown) by a metal ferrule 51 adapted for crimping over a mouth of the container.
- the construction of the core 102 of the apparatus 1 shown in Figure 1 is illustrated further in Figures 6 and 7.
- the core 102 has four flange portions 104 which together constitute the interrupted annular flange 104 referred to above, each formed on a respective leg 141 formed integrally with the enlarged lower portion 12.
- the legs 141 extend paraxially with the valve member 8 and are circumferentially spaced apart as shown in Figure 7 to define axially extending flow channels 142 allowing liquid to freely flow between the conduit 60 and the liquid inlet port 105.
- This arrangement also facilitates assembly of the core 102 with the cylindrical extension 11, each of the flange portions 104 having a leading ramped surface 143 such that when the core 102 is inserted into the extension 11 the legs are deformed inwardly by ramp action until the assembled position is reached in which the legs snap back to their rest position. Once assembled by this snap action, the core 102 remains connected to the extension 11 as a sub-assembly in a manner providing the lost motion referred to above.
- the spring 13 bears axially against the flange portions 104 while the flange 103 formed or the enlarged lower portion 12 of the valve member 8 is spaced from the upper end of the spring by the flange 104 of the core 102.
- a modified core 144 is illustrated in Figure 8 and differs from the core of Figure 1 to 7 in that each of the flange portions 104 has a profile of smaller radius when viewed in axial projection than the radius of the outer circumference of the legs 141.
- a further alternative core 145 is illustrated in Figures 9 and 10 and comprises a solid central portion 146 depending from the enlarged lower portion 12 of the valve member 8.
- the outer periphery of the solid central portion 146 defines a cylindrical surface 147 interrupted by axially extending fluted recesses 148 which constitute flow channels for liquid passing from the conduit 60 to the liquid inlet port 105.
- the shape of the recesses 148 is arcuate in profile when viewed in axial projection. Recesses of other shapes may also be utilised in accordance with the present invention including for example recesses of rectangular sided profile.
- Flange portions 104 including ramped surfaces 143 project radially from the cylindrical surface 147 and function in like manner to those of the cores 102 and 144 during assembly of the core 145 with the cylindrical extension 11 except that resilient deformation of the cruciform core is achieved by radial compression of the plastics material forming the core.
- a further alternative core 149 is illustrated in Figures 11 and 12.
- the core 149 is similar to the core 145 in that it includes a solid central portion 146 and a cylindrical surface 147 interrupted by axially extending recesses 148.
- the recesses 148 are however of V shaped cross section when viewed in axial projection so as to define side walls 150 arranged at right angles to one another.
- the core 149 thereby assumes a cruciform appearance.
- the core 149 is assembled with the cylindrical extension 11 in like manner to the method of assembly described above with reference to the core 145.
- the cylindrical extension 11 makes continuous sliding contact with the internal surface 15 of the tubular extension 16.
- the lower end portion 14 is maintained to an extent under radial compression within the tubular extension 16 by being a force fit.
- Such an arrangement has been found preferable to alternative constructions in which the cylindrical extension 11 would be made to slide externally on a re-entrant portion of the tubular extension, a problem with such alternative constructions being that it is found necessary to disengage the tubular extension from the sliding surface in the rest position to avoid deformation over time into a set position in which good sealing contact is no longer made.
- the cylindrical extension 11 when held in radial compression is found to be more resistant to deformation so that separation in the rest position is not necessary.
- the shape of the core may be varied in a number of ways within the scope of the present invention.
- the core 102 of Figures 6 and 7 may be modified to include a plurality of legs which are other than four in number.
- the minimum number of legs being two, in which configuration the core would appear cylindrical in shape with a diametrically extending slot dividing the core into to parallel legs.
- the legs would be equispaced circumferentially.
- the core 145 shown in Figures 9 and 10 may similarly by modified to include a different number of recesses 148, one or more of such recesses being provided to ensure adequate axial flow of liquid.
- the profile of the recesses 148 may alternatively be of square or triangular profile when viewed in axial projection.
- any of the cores described above with reference to Figures 6, 7, 9, 10, 11 and 12 and the modifications thereto may alternatively be modified to include flanges of the type shown as flange 104 in Figure 8 in which the flange portions are formed as localised projections having arcuate profile of smaller radius than the core when viewed in axial projection.
Landscapes
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US190923 | 1994-02-03 | ||
US08/190,923 US5458289A (en) | 1993-03-01 | 1994-02-03 | Liquid dispensing apparatus with reduced clogging |
GB9420678 | 1994-10-13 | ||
GB9420678A GB2286230B (en) | 1994-02-03 | 1994-10-13 | Dispensing apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0666219A1 true EP0666219A1 (fr) | 1995-08-09 |
EP0666219B1 EP0666219B1 (fr) | 1997-08-06 |
Family
ID=26305797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95300599A Expired - Lifetime EP0666219B1 (fr) | 1994-02-03 | 1995-01-31 | Dispositif de distribution |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0666219B1 (fr) |
AU (1) | AU693834B2 (fr) |
DE (1) | DE69500501T2 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102092666A (zh) * | 2010-12-07 | 2011-06-15 | 黄瑞娟 | 一种分配器 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5458289A (en) * | 1993-03-01 | 1995-10-17 | Bespak Plc | Liquid dispensing apparatus with reduced clogging |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4597512A (en) * | 1982-08-06 | 1986-07-01 | Neotechnic Engineering Limited | Aerosol valves |
AT384798B (de) * | 1978-04-13 | 1988-01-11 | Coster Tecnologie Speciali Spa | Ventil zum vermischen eines gases mit einem fluidum |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3715301A1 (de) * | 1987-05-08 | 1988-11-24 | Pfeiffer Erich Gmbh & Co Kg | Austragvorrichtung fuer medien |
US4986453A (en) * | 1989-05-15 | 1991-01-22 | The Pittway Corporation | Atomizing pump |
FR2631564B1 (fr) * | 1988-05-18 | 1990-08-17 | Step Soc Tech Pulverisation | Pompe-doseuse perfectionnee pour pulverisateurs |
-
1995
- 1995-01-31 EP EP95300599A patent/EP0666219B1/fr not_active Expired - Lifetime
- 1995-01-31 DE DE69500501T patent/DE69500501T2/de not_active Expired - Fee Related
- 1995-02-02 AU AU11546/95A patent/AU693834B2/en not_active Ceased
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT384798B (de) * | 1978-04-13 | 1988-01-11 | Coster Tecnologie Speciali Spa | Ventil zum vermischen eines gases mit einem fluidum |
US4597512A (en) * | 1982-08-06 | 1986-07-01 | Neotechnic Engineering Limited | Aerosol valves |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102092666A (zh) * | 2010-12-07 | 2011-06-15 | 黄瑞娟 | 一种分配器 |
Also Published As
Publication number | Publication date |
---|---|
DE69500501D1 (de) | 1997-09-11 |
EP0666219B1 (fr) | 1997-08-06 |
AU693834B2 (en) | 1998-07-09 |
DE69500501T2 (de) | 1997-12-04 |
AU1154695A (en) | 1995-08-10 |
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