Dispensing – Movably mounted supply container – Rotatable
Patent
1992-12-18
1994-05-10
Huson, Gregory L.
Dispensing
Movably mounted supply container
Rotatable
222321, B67D 564
Patent
active
053100921
DESCRIPTION:
BRIEF SUMMARY
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.
In dispensing liquid medicaments, it is a requirement that 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 piston sliding in a cylinder, a fluid inlet to the cylinder for product to be dispensed and a fluid outlet through the piston, valve means normally closing the fluid outlet and being opened in operation of the device, co-operating first and second cam surfaces being provided connected to the piston and cylinder respectively and means being provided for effecting relative movement of the cam surfaces to cause the piston to slide axially relative to the cylinder through a predetermined stroke characterised in that said valve means is resiliently urged into a closed position and is opened by fluid pressure as the piston slides in the cylinder.
Preferably the co-operating cam surfaces are axially directed and extend peripherally around the piston and cylinder, the movement effecting means operating to rotate the first cam surface relative to the second cam surface to cause the piston to slide axially in the cylinder.
The rotating means may comprise an actuator slidable transversely of the piston and cylinder and including means for engaging a portion of the cam surfaces to rotate the cam surfaces relative to one another.
The cam surfaces preferably have generally saw-tooth profiles.
A preferred embodiment of the invention will now be described, by way of example, with reference to the accompanying drawings in which:
FIG. 1 is a longitudinal section through a dispensing device according to the invention and showing the device in a first position;
FIG. 2 is a view similar to FIG. 1 showing the device in a second position, and
FIG. 3 is an exploded view of some of the components of the device of FIG. 1.
Referring first to FIG. 1, there is shown a pump dispensing device 10. The device is designed to provide accurately metered doses of a product contained in a product container or cartridge 20. The container 20 is open at its lower end and closed off by a sliding piston 21 so that the product is contained between the piston 21 and the upper end of container 20 as viewed in FIG. 1. The device is particularly suitable for dispensing liquid medicaments where it is important that accurately metered doses of the medicament are dispensed consistently.
The product container 20 is formed at its upper end with a tubular extension 23. The annular surface around the tubular extension 23 is provided with a series of cam profiles 24 and these are more clearly seen in FIG. 3. The cam profiles form a generally saw-tooth configuration around the annular upper surface of container 20. The container 20 is also provided with an inwardly directed generally tubular part 25 at its upper end. The configuration of this part is shown in FIGS. 1 and 2 and provides a seating for a ball valve 26. A retaining plug 27 with a central orifice therethrough seats in the upper part of container 20 between the extensions 23 and 25 and retains a first spring 28 which normally urges the ball 26 into a closed position as shown in FIG. 1.
The tubular extension 23 of container 20 provides a cylinder for a piston member 30. The piston member is generally cylindrical and includes, as viewed in FIG. 1, a downwardly directed sealing lip 31 which is a sliding fit in cylinder 23. A fluid flow path extends through piston 30 and is normally closed off by a second ball valve 33 located in a seat within the piston 30 and spring urged by a second spring 34 into its closed position.
The piston 30 is fixed in a nozzle 36 of the device. The nozzle is generally tubular and includes an insert 37 which defines an outlet flow path 38 parallel to the axis of the nozzle and terminating in a swirl chamber 39 immediately adjacent t
REFERENCES:
patent: 3746261 (1973-07-01), Nozawa et al.
patent: 3792800 (1974-02-01), Capra et al.
patent: 3901414 (1975-08-01), Capra et al.
patent: 4138039 (1979-02-01), Micallef
patent: 4264037 (1981-04-01), Nozawa
Bespak plc.
Huson Gregory L.
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