Patent Application
20060243825
This invention relates to improvements in or relating to nozzle devices and, more particularly but not exclusively, to improvements in or relating to pump-action nozzle devices and methods of making such devices.
Pump-action nozzle devices are commonly used to provide a means by which fluids can be dispensed from a non-pressurised container.
Conventional pump-action spray nozzles tend to be extremely complex in design and typically comprise numerous component parts (usually between 8 and 10 individual components in pump nozzle devices and between 10 and 14 individual components in trigger nozzle devices). As a consequence, these devices can be costly to manufacture due to the amount of material required to form the individual components and the assembly processes involved. In addition, many of the conventional devices tend to be bulky (which again increases the raw material costs) and a proportion of this bulk is invariably disposed inside the container to which the device is attached. This is a further drawback because the nozzle takes up a proportion of the internal volume of the container, which can be a particular problem in small containers where the available space inside the container is limited.
Examples of dispenser nozzles of simpler construction are disclosed in EP 0 442 858 A2 and U.S. Pat. No. 3,820,689 and EP 0 649 684. The nozzle arrangements disclosed in these citations comprise at least two separate component parts, including a base part and an upper part. The upper part is fitted to the upper surface of the base to define an internal chamber having an inlet equipped with an inlet valve and an outlet equipped with an outlet valve. The upper part is formed from a resiliently deformable material, whereas the base part is formed from a rigid plastic material. The upper part forms a generally dome-shaped protrusion on the upper surface of the device, which can be pressed by an operator to compress the internal chamber and facilitate the dispensing of any fluid present therein.
One problem with the aforementioned devices is that an operator is required to press the resiliently deformable dome-shaped portion inwards using their finger in order to dispense fluid from the internal chamber. This requires a certain amount of co-ordination on the part of the operator as well as a reasonable amount of pressure, which makes such devices less suitable for certain individuals. Furthermore, such devices are difficult to actuate using portions of the body other than a finger, such as the palm of the hand, wrist or elbow.
Therefore, there is a desire for a pump-action nozzle device which is:
(i) simple in design;
(ii) utilises less components; and
(iii) easy to actuate.
The present invention provides a solution to at least some of the problems associated with these known nozzle devices by providing, in a first aspect, a pump-action nozzle device configured to enable a fluid to be dispensed from a container, said nozzle having a body which defines an internal chamber having an inlet through which fluid may be drawn into said chamber and an outlet through which fluid present in the chamber may be expelled from the nozzle, said inlet comprising an inlet valve adapted to permit fluid to flow into the chamber through the inlet when the pressure within the chamber falls below the pressure within the interior of the container to which the device is attached and said outlet comprising an outlet valve configured to only permit fluid to flow out of the chamber and be expelled from the nozzle device when the pressure within the chamber exceeds the external pressure at the outlet by at least a predetermined threshold amount, wherein a first portion of the body defining said chamber forms a rigid or substantially rigid actuator surface to which a pressure can be applied and a second portion of the body that defines said chamber is configured to:
(i) resiliently deform from an initial resiliently biased configuration to a distended or deformed configuration in response to the application of a pressure, whereby the volume of said chamber defined by said portion of the body is reduced as said portion of the body is deformed from said initial configuration to said distended or deformed configuration, said reduction in volume causing the pressure within the chamber to increase and fluid to be ejected through the outlet valve; and
(ii) subsequently return to its initial resiliently biased configuration and return the actuator surface to its initial resiliently biased position when the applied pressure is removed, thereby causing the volume of the chamber to increase and the pressure therein to fall such that fluid is drawn into the chamber through the inlet valve.
By “substantially rigid” we mean that the actuator surface has a higher rigidity than the second portion of the body and is sufficiently rigid such that, when a pressure is applied to the actuator surface, the second portion of the body deforms while the deformation of the actuator surface is minimal.
The nozzle device of the present invention solves the aforementioned problems associated with many conventional pump-action spray nozzle devices by providing a device which is extremely simple in design and which will typically comprise no more than six separate component parts that are fitted together to form the assembled nozzle device. In preferred embodiments the device will comprise no more than three component parts or, more preferably, two separate component parts or, even more preferably, the device is formed from a single, integrally formed component. By “separate component parts” we mean that the parts are not linked in any way, i.e. they are not integrally formed with one another (but each separate component part may comprise one or more integral parts or portions). The key to reducing the number of components lies in the formation of the necessary features integrally within the body of the device. For instance, the chamber, inlet, inlet valve, outlet, and outlet valve can all be defined by the body, thereby reducing the need to include separate components with all the consequential increases in component and assembly costs.
The nozzle device of the present invention is further adapted to solve the aforementioned problems associated with pump-action nozzle devices of simpler construction, examples of which are described in, for example, EP 0 442 858, U.S. Pat. No. 3,820,689, and EP 0 649 684, by providing a substantially rigid actuator surface or area to which an operator can apply a pressure to actuate the expulsion of fluid from the device. This means that an operator can press the rigid/substantially rigid actuator surface and cause another portion (the second portion) of the body defining the chamber to deform and compress the chamber, without the rigid actuator surface itself deforming.
Preferably, the actuator surface is disposed on the upper surface of the device. Most preferably, the surface covers substantially the entire upper surface of the device.
Preferably the area of the actuator surface is sufficient to enable an operator to apply a pressure to it using the palm of their hand, elbow and/or wrist.
Preferably the actuator surface is flat or substantially flat, although it may also be curved in certain embodiments. It also preferred that the actuator surface retains its configuration when a pressure is applied, although it may be configured to flex to a limited extent.
It is also preferred that the second portion of the body defining the chamber that is capable of undergoing a resilient deformation when the actuator surface is pressed is a side wall of the chamber or a portion of the base. This portion of the body may equally be configured like a concertina or bellows so that pressing the first portion causes the bellowed second portion to compress.
The actuator surface may be configured to slide or pivot to compress the chamber when a pressure is applied.
In certain embodiments of the invention the outlet of the nozzle device may be adapted to generate a spray of the fluid ejected from the chamber of the nozzle device. The outlet of the nozzle device may be adapted to perform this function by any suitable means known in the art. For instance, the outlet orifice of the outlet may be a fine hole configured such that fluid flowing through it under pressure is caused to break up into numerous droplets. In such embodiments, however, it is preferable that the outlet comprises an outlet orifice and an outlet passageway that connects the chamber to the outlet orifice. The outlet valve is preferably disposed within the outlet passageway. It is especially preferred that the outlet passageway comprises one or more internal spray-modifying features that are adapted to reduce the size of liquid droplets dispensed through the outlet orifice of the nozzle device during use. Examples of internal spray modifying features that may be present in the outlet passageway include one or more expansion chambers, one or more swirl chambers, one or more internal spray orifices (adapted to generate a spray of fluid flowing through within the outlet passageway), and one or more venturi chambers. The inclusion of one or more of the aforementioned features is known to affect the size of the spray droplets produced during use of the device. It is believed that these features, when present alone or in combination, contribute to the atomisation of the droplets generated. These spray-modifying features, and the effect that they impart on the properties of the spray produced, are known in the art and are described in, for example, International Patent Publication Number WO 01/89958, the entire contents of which are incorporated herein by reference. It shall be appreciated that the provision of the outlet valve upstream from the outlet passageway and the outlet orifice ensures that the fluid enters the outlet passageway with sufficient force for the liquid to be broken up into droplets and form a spray.
In certain embodiments of the invention, the outlet passageway and outlet orifice may be in the form of a separate unit or insert, which can be connected to the outlet of the chamber to form the outlet of the nozzle device. The unit or insert may also be connected to the body of the device by a hinge so as to enable it to be optionally swung into the required position for use and swing out of position when it is not required.
In alternative embodiments of the invention, the liquid present in the chamber may be dispensed as a stream of liquid which is not broken up into droplets. Examples of such liquids dispensed in this form include soaps, shampoos, creams and the like.
Alternatively, the fluid dispensed may be a gas or mixture of gasses, such as air, for example.
The Body of the Nozzle Device
The chamber defined by the body may be defined between two or more interconnected parts of the body. It is especially preferred that the chamber of the nozzle device is defined between two interconnected parts, which may be separately formed component parts that fit together to define the chamber or, more preferably, the two parts will be integrally formed with one another as a single component. In the latter case, it is preferred that the two parts are connected together by hinge or foldable connection element which enables the two parts to be moulded together in the same mould and then brought into contact with one another to define the chamber.
In preferred embodiments of the invention in which the outlet comprises the outlet valve, an outlet orifice and an outlet passageway that connects the outlet valve to the outlet orifice, it is also preferred that the at least two interconnected parts that define the chamber also define at least a portion of the outlet passageway. Most preferably, the two interconnected parts form the outlet valve between them and also define the entire outlet passageway and the outlet orifice.
The outlet passageway is preferably defined between an abutment surface of one of said parts and an opposing abutment surface of another of said parts. One or more of the abutment surfaces preferably comprises one or more grooves and/or recesses formed thereon which define the outlet passageway when the abutment surfaces are contacted together. Most preferably, each of said abutment surfaces comprises a groove and/or recesses formed thereon which align to define the outlet passageway when the abutment surfaces are contacted together. The grooves and/or recesses preferably extend from the chamber to an opposing edge of the abutment surfaces where, when the abutment surfaces are contacted together, an outlet orifice is defined at the end of the outlet passageway. In preferred embodiments where one or more spray modifying features are present in the outlet passageway, the features may be formed by aligning recesses or other formation formed on the abutment surfaces, as illustrated and described in International Patent Publication Number WO 01/89958.
The two parts of the body may be permanently fixed together by, for example, ultrasonically welding or heat welding. If the base and upper part are to be moulded or welded together, then it is preferable that they are made from compatible materials.
Alternatively, the two parts may be configured to fit tightly/resistively to one another to form the nozzle (e.g. by the provision of a snap-fit connection) in the absence of any welding. For instance, the edges of one part may be configured to fit into a retaining groove of the other part to form the nozzle device.
As a further alternative, a compatible plastic material may be moulded over the join of the two parts to secure them together. This can be achieved by moulding the two components simultaneously in a tool, joining them together in the tool to form the dispenser nozzle device and then moulding a suitable plastic material around them to hold the two parts together.
In certain embodiments, the two parts may remain releasably attached to one another so that they can be separated during use to enable the chamber and/or the outlet to be cleaned.
It is most preferred that the two parts of the body of the nozzle device that define the chamber are a base part and an upper part. The base part is preferably adapted to be fitted to the opening of a container by a suitable means, such as, for example, a screw thread or snap fit connection. Furthermore, in addition to forming a portion of the body that defines the chamber, the base part also preferably defines the inlet as well as a portion of the outlet passageway leading from the chamber to the outlet orifice in preferred embodiments.
The upper part is adapted to be fitted to the base so that between them they define the chamber and, in preferred embodiments, the outlet valve, outlet passageway and/or outlet orifice. In certain preferred embodiments of the invention, the base and upper part also define the outlet orifice. It is also preferred that the upper part forms the resiliently deformable portion of the body defining the chamber.
It is preferred that the upper part comprises the first portion of the body and the base comprises the second portion of the body define above.
Material
The body of the nozzle arrangement may be made from any suitable material.
In certain embodiments of the invention where the body comprises two interconnected parts which fit together to define the chamber, the two parts may be made from either the same or different materials. For instance, one of the parts may be made from a flexible/resiliently deformable material, such as a resiliently deformable plastic or rubber material, and the other of said parts may be made from a rigid material, such as a rigid plastic. Such embodiments are preferred for some applications because the flexible/resiliently deformable material forms the second portion of the body defining the chamber and can readily be deformed by an operator pressing the actuator surface to actuate the ejection of fluid present in the chamber. The flexible material can also provide a soft touch feel for the operator. Such embodiments can be made by either moulding the two parts separately and then connecting them together to form the assembled nozzle arrangement, or moulding the two parts in the same tool using a bi-injection moulding process. In the latter case, the two parts could be moulded simultaneously and then fitted together within the moulding tool or, alternatively, one part could be moulded first from a first material and the second part made from a second material could be moulded directly onto the first part.
Alternatively, the two parts may both be made from either a rigid or a flexible material, although in the latter case the first portion of the body must still be substantially rigid. The rigid and flexible material may be any suitable material from which the nozzle device may be formed. For instance, it may be formed from metallic material such as aluminium foil or a flexible material such as rubber. Preferably, however, the body of the device is formed entirely from a rigid plastic material, although a flexible plastic material could be used provided the first portion of the body is if desired.
It is preferable that the first portion of the body is formed from a rigid plastic material. Most preferably, the entire pump-action nozzle device (i.e. the body and the actuator) is formed from a single rigid plastic material.
The expression “rigid plastic material” is used herein to refer to a plastic material that possesses a high degree of rigidity and strength once moulded into the desired form, but which can also be rendered more flexible or resiliently deformable in portions by reducing the thickness of the plastic. Thus, a thinned section of plastic can be provided to form the at least a portion of the body that defines the chamber and which is configured to resiliently deform.
The term “flexible plastic” is used herein to denote plastics materials which are inherently flexible/resiliently deformable so as to enable the resilient displacement of at least a portion of the body to facilitate the compression of the chamber. The extent of the flexibility of the plastic may be dependent on the thickness of the plastic in any given area or region. Such “flexible plastic” materials are used, for example, in the preparation of shampoo bottles or shower gel containers. In the fabrication of a nozzle device of the present invention, portions of the body may be formed from thicker sections of plastic to provide the required rigidity to the structure, whereas other portions may be composed of thinner sections of plastic to provide the necessary deformability characteristics. If necessary, a framework of thicker sections, generally known as support ribs, may be present if extra rigidity is required in certain areas.
Forming the device from a single material enables the entire body of the nozzle device to be moulded in a single tool and in a single moulding operation, as discussed further below.
The formation of the nozzle device from a single material, particularly in preferred embodiments where the two parts are integrally formed and connected to one another by a foldable connection element or a hinged joint so that the upper part can be swung into contact with the base part to form the assembled nozzle device, avoids the requirement for the assembly of multiple, separate component parts. Furthermore, forming the nozzle device from a single material provides the possibility of possibility of welding the two parts together (e.g. by heat or ultrasonic welding) or, if the plastic material is a rigid plastic material, then a snap-fit connection can be formed between the upper part and the base. The latter option also enables the upper part and base to be disconnected periodically for cleaning.
For most applications the nozzle device would need to be made from a rigid material to provide the necessary strength for the actuator surface and enable the two-parts to be either snap fitted or welded together. In such cases, the deformable portion of the body tends to deform only when a certain minimum threshold pressure is applied and this makes the pump action more like the on/off action associated conventional pump-action nozzle devices. However, in certain applications, a flexible material may be preferred.
The second portion of the body configured to resiliently deform could be a relatively thin section of a rigid plastic material which elastically deforms to compress the chamber when a pressure is applied and then subsequently returns to its initial resiliently biased configuration when the applied pressure is removed.
In all cases, however, it is preferable that the abutment surfaces that define the outlet passageway of the outlet are formed from a rigid plastic material. Although flexible/resiliently deformable materials could be used for this purpose they are generally less preferred because any spray-modifying features present will typically need to be precisely formed from a rigid material. Thus, in some embodiments of the invention, one of the two parts that defines the outlet and the chamber may be formed from two materials, namely a rigid material that forms the abutment surface that defines the outlet passageway and the outlet orifice, and a resiliently deformable material that defines the chamber.
Outlet Valve
In order to function optimally, it is necessary that the outlet of the chamber is provided with, or is adapted to function as, a one-way valve. The one-way valve enables product stored in the chamber to be dispensed through the outlet only when a predetermined minimum threshold pressure is achieved within the chamber (as a consequence of the reduction in the volume of the internal chamber caused by the displacement of the resiliently deformable wall from its initial resiliently biased configuration), and closes the outlet at all other times to form an airtight seal. The closure of the valve when the pressure in the chamber is below a predetermined minimum threshold pressure prevents air being sucked back through the outlet into the chamber when the applied pressure to the resiliently deformable portion of the body is released and the volume of the chamber increases as the resiliently deformable wall re-assumes its initial resiliently biased configuration.
Any suitable one-way valve assembly that is capable of forming an airtight seal may be provided in the outlet. However, it is preferable that the valve is formed by the component parts of the body of the nozzle device. Most preferably, the valve is formed between the abutment surfaces that define outlet passageway.
In certain embodiments of the invention, the outlet valve is formed by one of the abutment surfaces being resiliently biased against the opposing abutment surface to close off a portion of the length of the outlet passageway. In this regard, the valve will only open to permit fluid to be dispensed from the chamber when the pressure within the chamber is sufficient to cause the resiliently biased abutment surface to deform away from the opposing abutment surface and thereby form an open channel through which fluid from the chamber can flow. Once the pressure falls below a predetermined minimum threshold value, the resiliently biased surface will return to its resiliently biased configuration and close off the passageway.
In certain embodiments of the invention, it is especially preferred that the resiliently biased abutment surface is integrally formed with the resiliently deformable portion of the body, which defines the chamber.
In embodiments where the body is made entirely form a rigid plastic material, the resistance provided by the resiliently biased surface, which will be a thin section of rigid plastic) may not be sufficiently resilient to achieve the required minimum pressure threshold for the optimal functioning of the device. In such cases, a thickened rib of plastic, which extends across the passageway, may be formed to provide the necessary strength and resistance in the outlet passageway/valve. Alternatively, a rigid reinforcing rib could be provided above part of the outlet passageway/valve.
In an alternative preferred embodiment, the outlet/pre-compression valve is formed by a resiliently deformable member formed on one of said abutment surfaces which extends across the outlet passageway to close off and seal the passageway. The member is mounted to the device along one of its edges and has another of its edges (preferably the opposing edge) free, the free end being configured to displace when the pressure within the chamber exceeds a predetermined minimum threshold value. The free end abuts a surface of the outlet channel to form a seal therewith when the pressure is below the predetermined minimum threshold value. However, when the pressure exceeds the predetermined minimum threshold value, the free end of the member is displaced from the abutment surface of the channel to form an opening through which the fluid present in the chamber can flow to the outlet. Preferably, the resiliently deformable member is positioned within a chamber formed along the length of the outlet channel or passageway. Most preferably, the abutment surface, which forms the seal with the free end of the member at pressures below the minimum threshold, is tapered or sloped at the point of contact with the free end of the member. This provides a point seal contact and provides a much more efficient seal. It will of course be appreciated that the slope or taper of the abutment surface must be arranged so that the free end of the resiliently deformable member contacts the slope when the pressure within the chamber is below the predetermined minimum threshold, but distends away from it when the predetermined minimum threshold is exceeded.
Alternatively, the valve may be a post or plug formed on the abutment surface of one of the base or upper parts and which contacts the opposing abutment surface to close off and seal the passageway. The post or plug will be mounted to a deformable area of the base or upper part so that when the pressure within the chamber exceeds a predetermined threshold value, the post or plug can be deformed to define an opening through which fluid can flow through the outlet.
The predetermined minimum pressure that must be achieved within the chamber in order to open the outlet valve will depend on the application concerned. A person skilled in the art will appreciate how to modify the properties of the resiliently deformable surface by, for example, the selection of an appropriate resiliently deformable material or varying the manner in which the surface is fabricated (e.g. by the inclusion of strengthening ridges).
Inlet Valve
To ensure that fluid is only ejected through outlet when the chamber is compressed by displacing the resiliently deformable portion of the body into the chamber from its initial resiliently biased configuration, it is necessary to provide a one-way inlet valve disposed at or in the inlet of the nozzle device.
Any suitable inlet valve may be used.
The inlet valve may be adapted to only open and permit fluid to flow into the chamber when the pressure within the chamber falls below a predetermined minimum threshold pressure (as is the case when the pressure applied to the resiliently deformable portion of the chamber to compress the chamber is released and the volume of the chamber increases as the resiliently deformable portion reassumes it's initial resiliently biased configuration). In such cases, the inlet valve may be a flap valve which consists of a resiliently deformable flap positioned over the inlet opening. The flap is preferably resiliently biased against the inlet opening and adapted to deform so as to allow fluid to be drawn into the chamber through the inlet when the pressure within the chamber falls below a predetermined minimum threshold pressure. At all other times, however, the inlet will be closed, thereby preventing fluid flowing back from the chamber into the inlet. It is especially preferred that the resiliently deformable flap is formed as an integral extension of the resiliently deformable portion of the body which defines the chamber. It is also especially preferred that the base defines the inlet and the resiliently deformable portion of the body is formed by the upper part. It is therefore the preferred that the upper part comprises the resiliently deformable flap that extends within said chamber to cover the inlet opening to the chamber and form the inlet valve.
Alternatively, the flap may not be resiliently biased against the inlet opening and may instead be disposed over the inlet opening and configured such that it is pressed against the inlet only when the chamber is compressed and the pressure therein increases.
Problems can arise, however, with the simple provision of a flap valve that is resiliently biased over the inlet opening. Specifically, over time the elastic limit of the material from which the flap is formed may be exceeded, which may cause it to not function properly. This problem applies particularly to embodiments of the invention in which the flap is formed from a thin section of a rigid material, although it also applies to a lesser extent to flexible materials and can occur due to deformation of the flap when the chamber is compressed, as well as when the flap deforms to open the valve. As a consequence, fluid could leak from the chamber back into the container through the inlet.
For these reasons it is preferable that flap valve comprises a number of adaptations. In particular, it is preferred that the inlet has a raised lip extending around the inlet orifice that the resiliently deformable flap abuts to create a tight seal around the inlet. The provision of a lip ensures a good contact is obtained with the flap. In embodiments where the lip is very small it may be necessary to provide one or more additional support ribs at either side of the inlet opening to ensure that a proper seal is formed and to also prevent the lip from damage.
A further preferred feature is that the flap possesses a protrusion or plug formed on its surface. The protrusion or plug extends a short way into the inlet opening and abuts the side edges to further enhance the seal formed.
It is also preferred that a second reinforcing flap or member contacts the opposing surface of the resiliently deformable flap to urge it into tight abutment with the inlet opening. It is also preferred that the second reinforcing flap contact the opposing surface of the resiliently deformable flap at or close to the portion of the opposing surface that covers the inlet orifice to maximise the vertical pressure of the main flap over the hole. Again this helps to maintain the integrity of the seal.
Lock
The nozzle device may also be provided with a locking means to prevent the fluid being dispensed accidentally.
In such embodiments the lock will be integral part of the body and will not be a separate component connected to the body. For instance, the locking means may be hinged bar or member that is integrally connected to a part of the body (e.g. either the base or upper part) and which can be swung into a position whereby the bar or member prevents the outlet valve from opening.
The locking means may also comprise a rigid cover that can be placed over the resiliently deformable portion of the body to prevent it being compressed. The cover may be connected to the nozzle device by a hinge to enable it to be folded over when required. Alternatively, the rigid cover may be a slidable over cap that can be slid downwards to compress the chamber during use. The cover can be twisted to lock it and thereby prevent the accident actuation of the device.
Air Release/Leak Valve
The device may further comprise an air leak through which air can flow to equalise any pressure differential between the interior of the container and the external environment. In some cases, the air leak may simply occur through gaps in the fitting between the dispenser nozzle and the container, but this is not preferred because leakage may occur if the container is inverted or shaken. In preferred embodiments, the dispenser nozzle further comprises an air leak valve, i.e. a one-way valve that is adapted to permit air to flow into the container, but prevents any fluid leaking out of the container if it is inverted. Any suitable one-way valve system would suffice. It is preferred, however, that the air leak valve is integrally formed within the body of the dispenser or, more preferably, between two component parts of the body of the dispenser.
Most preferably, the air leak valve is formed between the upper part and base which define the chamber of the dispenser nozzle.
Preferably, the air leak valve comprises a valve member disposed within a channel that is defined by the body of the device and connects the interior of the fluid supply to the external environment. Most preferably, the valve member is resiliently biased so as to contact the sides of the channel and forms a sealing engagement therewith to prevent any liquid from leaking out of the container, the valve member being further adapted to either resiliently deform or displace from the sealing engagement with the sides of the channel to define an opening through which air can flow into the container when pressure within the container falls below the external pressure by at least a minimum threshold amount. Once the pressure differential between the interior and the exterior of the container has been reduced to below the minimum threshold pressure, the valve member returns to it position in which the channel is closed.
Preferably, the valve member is in the form of a plunger that extends into the channel and comprises an outwardly extending wall that abuts the sides of the channel to form a seal. Preferably, the outwardly extending wall is additionally angled towards the interior of the container. This configuration means that a high pressure within the container and exerted on the wall of the valve member will cause the wall to remain in abutment with the sides of the channel. Thus, the integrity of the seal is maintained thereby preventing liquid from leaking out through the valve. Conversely, when pressure within the container falls below the external pressure by at least a minimum threshold amount, the wall is deflected away from the sides of the container to permit air to flow into the container to equalise or reduce the pressure differential.
It is especially preferred that the plunger is mounted on to a deformable base or flap which is capable of some movement when the dome is pressed to displace any residue that may have accumulated in the air leak valve. In addition, the provision of a moveable (e.g. resiliently deformable) element within the air leak valve is preferred because it helps to prevent the valve becoming clogged during use.
In certain embodiments of the invention it is also preferred that a protective cover is provided over the opening of the female tube on the internal surface of the device to prevent liquid present in the interior of the container from contacting the valve member with a high or excessive force when the container is inverted or shaken aggressively. The cover will allow air and some fluid to flow past, but will prevent fluid impacting on the seal formed by the flared end of the plunger directly, and thus will prevent the seal being exposed to excessive forces.
In an alternative embodiment, the channel of the air leak valve may be resiliently deformable instead of the male part. This arrangement can be configured so that the side walls of the channel distort to permit air to flow into the container.
The valve member and channel could be made from the same material or different materials. For instance, they may both be made from a semi-flexible plastic or the female element may be made from a rigid plastic and the male part made from a resiliently deformable material.
With certain products stored in containers over time there is a problem associated with gas building up inside the bottle over time. To release the build up of pressure, which can inevitably occur, a release valve is required. The air leak valve described above can be modified to additionally perform this function by providing one or more fine grooves in the side of the channel. These fine groove(s) will permit gas to slowly seep out of the container, bypassing the seal formed by the contact of the valve member with the sides of the channel, but prevent or minimise the volume of liquid that may seep out. Preferably, the groove or grooves formed in the side walls of the channel is/are formed on the external side of the point of contact between the valve member and the sides of the channel so that it/they are only exposed when the pressure inside the container increases and acts on the plunger to cause it to deform outwards (relative to the container). The plunger will return to its resiliently biased position in which the grooves are not exposed once any excess gas has been emitted. No liquid product should be lost during this process.
Alternatively, the gas pressure within the container could urge the valve member outwards so that it is displaced from the channel and defines an opening through which the gas could flow.
Seal
In preferred embodiments of the invention comprising at least two component parts, it is preferred that a seal is disposed at the join between the at least two interconnected parts to prevent any fluid leaking out of the dispenser nozzle. Any suitable seal would suffice. For instance, the two parts could be welded to one another or one part could be configured to snap fit into a sealing engagement with the other part or have possess a flange around its perimeter that fits tightly around the upper surface of the other part to form a seal therewith.
Preferably, the seal comprises a male protrusion formed on the abutment surface of one of the at least two parts that is received in a sealing engagement with a corresponding groove formed on the opposing abutment surface of the other part when the two parts are connected together.
The seal preferably extends around the entire chamber and the sides of the outlet passageway so that fluid leaking from any position within the chamber and or outlet passageway is prevented from seeping between the join between the two component parts. In certain embodiments where the outlet orifice is not defined between the two component parts of the body, it is preferred that the seal extends around the entire chamber and any portion of the outlet that is defined between the two interconnected parts of the body.
In certain embodiments that comprise an outlet passageway the protrusion member may extend across the passageway and form the resiliently deformable valve member of the outlet valve. This portion of the protrusion will usually be thinner to provide the necessary resilience in the valve member to permit it to perform its function.
In certain embodiments of the invention, the male protrusion may be configured to snap fit into the groove or, alternatively, the male protrusion may be configured to resistively fit into the groove in a similar manner to the way in which a plug fits into the hole of a sink.
Dip Tube
In most cases, a dip tube may be integrally formed with the dispenser, or alternatively the body of the dispenser may comprise a recess into which a separate dip tube can be fitted. The dip tube enables fluid to be drawn from deep inside the container during use and thus, will be present in virtually all cases.
Alternatively, it may be desirable with some containers, particularly small volume containers, such as glues, perfume bottles and nasal sprays, to omit the dip tube, because the device itself could extend into the container to draw the product into the dispenser nozzle during use, or the container could be inverted to facilitate the priming of the dispenser with fluid. Alternatively, the device may further comprise a fluid compartment formed as an integral part of device from which fluid can be drawn directly into the inlet of the nozzle without the need for a dip tube.
Chamber
The chamber of the nozzle device may be of any form and it shall of course be appreciated that the dimensions and shape of the dome will be selected to suit the particular device and application concerned. Similarly, all the fluid in the chamber may be expelled when the dome is compressed or, alternatively, only a proportion of the fluid present in the chamber may be dispensed, again depending on the application concerned.
In some cases, the resiliently deformable portion of the body may not be sufficiently resilient to retain its original resiliently biased configuration following deformation. This may be the case where the fluid has a high viscosity and hence tends to resist being drawn into the chamber through the inlet. In such cases, extra resilience can be provided by the positioning of one or more resiliently deformable posts within the chamber, which bend when the chamber is compressed and urge the deformed portion of the body back to its original resiliently biased configuration when the applied pressure is removed. Alternatively, one or more thickened ribs of plastic could extend from the edge of the resiliently deformable area towards the middle of this portion. These ribs will increase the resilience of the resiliently deformable area by effectively functioning as a leaf spring which compresses when a pressure is applied to the resiliently deformable portion of the body, and urges this portion back to its initial resiliently biased configuration when the applied pressure is removed.
Yet another alternative is that a spring or another form of resilient means is disposed in the chamber. As above, the spring will compress when the wall is deformed and, when the applied pressure is removed, will urge the deformed portion of the body to return to its original resiliently biased configuration and, in doing so, urges the compressed chamber back into its original “non-compressed configuration”.
Two or More Chambers
The nozzle device of the invention may comprise two or more separate internal chambers.
Each individual chamber may draw fluid into the nozzle device through a separate inlet from different fluid sources, e.g. separate fluid-filled compartments within the same container.
Alternatively, one or more of the additional chambers may not comprise an inlet. Instead a reservoir of the second fluid may be stored in the chamber itself and the additional chamber or its outlet may be configured to only permit a predetermined amount of the second fluid to be dispensed with each actuation.
As a further alternative, one or more chambers of the additional chambers may draw air in from outside the nozzle device. Whether the additional chamber or chambers contain air or some other fluid drawn from a separate compartment within the container, the contents of the two or more chambers can be ejected simultaneously through the outlet by simultaneously compressing both chambers together. The contents of the respective chambers will then be mixed within the outlet, either on, after or prior to, ejection from the nozzle device. It shall be appreciated that varying the relative volumes of the separate chambers and/or the dimensions of the outlet can be used to influence the relative proportions of constituents present in the final mixture expelled through the outlet. Furthermore, the outlet passageway may be divided into two or more separate channels, each channel extending from a separate chamber, and each separate channel may feed fluid into a spray nozzle passageway as discussed above where it is mixed prior to ejection.
Where an additional chamber for the expulsion of air is present, it shall be appreciated that, once the expulsion of air is complete and the applied pressure is removed thereby allowing the chamber to deform back to its original expanded configuration, more air needs to be drawn into the chamber to replenish that expelled. This can be achieved by either sucking air back in through the outlet (i.e. not providing this additional chamber with an airtight outlet valve) or, more preferably, drawing air in though an inlet hole in the body defining the chamber. In the latter case, the inlet hole is preferably provided with a one-way valve similar to the inlet valve discussed above. This valve will only permit air to be drawn into the chamber and will prevent air being expelled back through the hole when the chamber is compressed.
In most cases, it is desirable to co-eject the air and fluid from the container at approximately the same pressure. This will require the air chamber to be compressed more (e.g. 3-200 times more—depending on the application concerned) than the fluid/liquid-containing chamber. This may be achieved by positioning the chambers so that, when a pressure is applied, the compression of the air-containing chamber occurs preferentially, thereby enabling the air and liquid to be ejected at the same or substantially the same pressure. For example, the air-containing chamber may be positioned behind the liquid-containing chamber so that, when a pressure is applied, the air chamber is compressed first until a stage is reached when both chambers are compressed together.
As an alternative, the nozzle device may also be adapted in such a way that the air pressure may be higher or lower than the liquid pressure, which may be beneficial for certain applications.
The chambers may be arranged side by side or one chamber may be on top of another. In a preferred embodiment where one of the additional chambers contains air, the additional air chamber is positioned relative to the chamber of the nozzle device so that the compression of the air chamber causes the resiliently deformable portion of the body to deform and compress the chamber of the nozzle device.
Preferably, the fluid present in each chamber are ejected simultaneously. However, it shall be appreciated that one chamber may eject its fluid before or after another chamber in certain applications.
In alternative embodiments, air and fluid from the container may be present in a single chamber, rather than separate chambers. In such cases, fluid and air is co-ejected and may be mixed as it flows through the outlet. For example, where the outlet comprises an expansion chamber, i.e. a widened chamber positioned in the outlet passageway, the contents ejected from the chamber could be split into separate branches of the channel and enter the expansion chamber at different locations to encourage mixing.
Integrally Formed with a Container
In most cases it is preferable that the nozzle device is adapted to be fitted to container by some suitable means, e.g. a snap fit or a screw thread connection. In certain cases, however, the nozzle device could be incorporated into a container as an integral part. For instance, the nozzle device could be integrally moulded with various forms of plastic container, such as rigid containers or bags. This is possible because the device is preferably moulded as a single material and, therefore, can be integrally moulded with containers made from the same or a similar compatible material.
According to a second aspect of the present invention, there is provided a container having a pump-action nozzle device as hereinbefore defined fitted to an opening thereof so as to enable the fluid stored in the container to be dispensed from the container through said nozzle device during use.
According to a third aspect of the present invention, there is provided a container having a pump-action nozzle device as hereinbefore defined integrally formed therewith so as to enable the fluid stored in the container to be dispensed from the container through said nozzle device during use.
According to a fourth aspect of the present invention, there is provided a pump-action nozzle device configured to enable a fluid to be dispensed from a container, said nozzle having a body which defines an internal chamber having an inlet through which fluid may be drawn into said chamber and an outlet through which fluid present in the chamber may be expelled from the nozzle, said inlet comprising an inlet valve adapted to permit fluid to flow into the chamber through the inlet when the pressure within the chamber falls below the pressure within the interior of the container to which the device is attached and said outlet comprising an outlet valve configured to only permit fluid to flow out of the chamber and be expelled from the nozzle device when the pressure within the chamber exceeds the external pressure at the outlet by at least a predetermined threshold amount, wherein a first portion of the body defining said chamber forms a rigid or substantially rigid actuator surface to which a pressure can be applied and a second portion of the body that defines said chamber is configured to:
(i) be displaceable from an initial resiliently biased configuration to a distended or deformed configuration in response to the application of a pressure, whereby the volume of said chamber defined by said portion of the body is reduced as said portion of the body is deformed from said initial configuration to said distended or deformed configuration, said reduction in volume causing the pressure within the chamber to increase and fluid to be ejected through the outlet valve; and
(ii) subsequently return to its initial position when the applied pressure is removed, thereby causing the volume of the chamber to increase and the pressure therein to fall such that fluid is drawn into the chamber through the inlet valve.
Preferably the nozzle device is as defined above.
In addition, it is also preferable, the second part of the body that can be displaced to reduce the volume of the chamber and thereby cause fluid present in said chamber to be ejected through the outlet is a piston mounted within a piston channel. The piston channel may form the entire chamber or, alternatively, just a portion thereof.
Preferably, the nozzle device comprises a means for displacing the piston inwards from its initial position and then subsequently returning it is initial position. This may be achieved by any suitable means, such as, for example, a trigger or over cap connected to the piston, which can be operated to displace the piston, when desired. Preferably, the trigger actuator is resiliently biased to retain said portion of the body in its initial position in the absence of any applied pressure.
Method of Manufacture
The nozzle devices of the present invention may be made by any suitable methodology know in the art.
As previously described, preferred embodiments of the invention comprise a body having two parts (a base and upper part) which fit together to define at least the chamber of the device and, more preferably, the chamber and at least a portion of the outlet.
According to a further aspect of the present invention, there is provided a method of manufacturing a nozzle device as hereinbefore defined, said nozzle device having a body composed of at least two interconnected parts and said method comprising the steps of:
Each part of the body may be a separate component part, in which case the component parts are initially formed and then assembled together to form the nozzle device.
Alternatively, and more preferably, the two parts of the body or one of the parts of the body and the trigger actuator may be integrally formed with one another and connected by a bendable/foldable connection element. In such cases, the connected parts are formed in a single moulding step and then assembled together with the remaining part to form the nozzle device. For instance, the base and upper part of the preferred embodiments of the device may be integrally formed and connected to one another by a foldable/bendable connection element. Thus, the entire device will be formed in a single moulding step from a single material. Once formed, the upper part can be folded over and connected to the base to form the assembled nozzle device.
As an alternative, the nozzle device may be formed by a bi-injection moulding process whereby a first component part the body is formed and a second part is then moulded onto the first part. Each part may be moulded from the same or a different material. As before, the trigger actuator may be a separate component part that is then fitted to the body of the nozzle device, or it may be integrally formed with one of the parts of the body.
Once the two parts of the body are connected to one another to form the assembled body of the device, the two parts may be over moulded with another plastic to hold the two parts together
According to a further aspect of the present invention, there is provided a method of manufacturing a nozzle device as hereinbefore defined, said nozzle device having a body composed of at least two interconnected parts and said method comprising the steps of:
The at least two parts are preferably moulded within the same moulding tool in a bi-injection moulding process. Usually the first part will be the base part of the nozzle device and the second part will be the upper part.
According to a further aspect of the present invention, there is provided a method of manufacturing a nozzle device as hereinbefore defined, said nozzle device having a body composed of at least two interconnected parts and said method comprising the steps of:
The framework for the second part may be fitted to the base prior to the over-moulding step.
Alternatively, the over-moulding may take place before the framework for the second part is fitted to the first part.
The over-moulding may be the same material to that of the first part and the framework of the second part or it may be a different material.
It is especially preferred that the base is moulded first from a rigid plastic material together with the framework support for the upper part. The framework for the upper part is preferably connected to the base by a hinged or foldable connection member, which enables the framework to be folded over and fitted to the base during the assembly of the final product. The framework is over moulded with a compatible flexible, resiliently deformable plastic material which forms the resiliently deformable portion of the body that defines the chamber. The resiliently deformable plastic material may also form resiliently deformable valve members for the outlet valve and the inlet valve. It may also extend over other parts of the nozzle surface to provide a soft-touch feel to the device when an operator grips it. The rigid framework of the upper part may form an outer edge of the upper part, which forms the point of connection with the base and, in embodiments where a spray nozzle passageway is present, the framework may also form an upper abutment surface which contacts a lower abutment surface formed the base to define the spray passageway and outlet orifice.
According to a further aspect of the present invention, there is provided a method of manufacturing a nozzle device as hereinbefore defined, said nozzle device having a body composed of at least two interconnected parts and said method comprising the steps of:
According to a further aspect of the present invention, there is provided a method of manufacturing a nozzle device as hereinbefore defined, said nozzle device having a body composed of at least two interconnected parts and wherein said parts are connected to one another by a connection element such that said parts are moveable relative to one another, said method comprising the steps of:
The dispenser nozzles of the present invention may be made by a number of different moulding techniques.
Blowing Agent
Preferably, a blowing agent is incorporated into the mould together with the plastic material. The blowing agent produces bubbles of gas within the moulded plastic that prevent the occurrence of a phenomenon known as sinkage from occurring, The problem of sinkage and the use of blowing agents in the manufacture of blowing agents to address this problem is described further in the applicant's co-pending International Patent Publication No. W003/049916, the entire contents of which are incorporated herein by reference.
How the invention may be put into practice will now be described by way of example only, in reference to the following drawings, in which:
a, 10b and 10c show various views of an embodiment of the invention;
a and 11b show various views of a second embodiment of the present invention; and
In the following description of the figures, like reference numerals are used to denote like or corresponding parts in different figures, where appropriate.
The nozzle device shown in
The body 100 is formed from a single rigid plastic material in a single moulding operation. The device will be moulded in the configuration shown in
A groove 104 formed in the elevated portion of the base 101b forms an initial portion of an outlet passageway in the assembled nozzle arrangement that leads from the internal chamber to an outlet valve. The outlet valve is formed by a resiliently deformable flap 105 formed on the under surface of the upper part 102 which is received within a recess 106 formed in the opposing abutment surface 101a of the base. The flap 105 extends over the end of the groove 104 when the base and upper parts are connected together to close the outlet passageway. The flap 105 is configured to resiliently deform away from the end of the groove 104 when the pressure within the internal chamber exceeds a predetermined minimum threshold to define an open passageway, as described further below. The flap 105 is also formed as a continuation of the ridge protrusion 112 discussed further below.
The remainder of the fluid flow passageway is defined by the alignment of grooves and or recesses 104a, 104b and 104c formed in the abutment surface 101a of the base 101 with corresponding grooves and/or recesses 107a, 107b and 107c, respectively. The portions 104c and 107c are semi-circular recesses which align to form a circular swirl chamber which induces rotational flow into liquid passing through the outlet passageway during use. Liquid is then ejected from the swirl chamber through an outlet formed by the alignment of grooves 104d and 107d respectively.
The base 101 also defines an inlet orifice 108, which is positioned within a recess 108a formed in the elevated portion 101b. A resiliently deformable flap 109 formed on the under surface of the upper part 102 is received within the recess 108a in the assembled nozzle arrangement and is resiliently biased against the inlet opening to close off the inlet. The flap 109 is configured to resiliently deform away from the inlet opening to permit fluid to be drawn into the chamber when the pressure therein falls below the pressure in the attached container by at least a predetermined minimum threshold amount. The opening of the inlet 108 is provided with a lip against which the flap 109 abuts to form a seal. Supporting ribs 108b and 108c prevent the flap 109 exerting too much force on the lip.
Locating posts 110a and 110b formed on the under surface of the upper part 102 are received within holes 111a and 111b formed in the base and assist in holding the base and the upper part in tight abutment with one another. In addition, a ridge protrusion 112, which extends around the recess 102b is received within, and forms a sealing engagement with, a correspondingly shaped groove 113, which is formed in the upper surface of the base 101 and extends around the elevated portion 101b. The ridge 112 and groove fit tightly together to assist in holding the base 101 and the upper part 102 in tight abutment with one another. The ridge and groove also form a seal that prevents any fluid leaking out of the chamber and seeping between the upper part and the base. This seal also extends to encompass the outlet passageway and the outlet orifice by virtue of portions 112a and 113a.
The body also comprises an air leak valve which consists of a resiliently deformable member 115 formed on the under surface of the upper part 102, which is received within an opening 116 formed on the abutment surface 101a of the base when the nozzle arrangement is assembled. The opening 116, together with the groove 115 defines a passageway through which air may flow into the container from the outside in the assembled nozzle arrangement. The tip of the resiliently deformable member 115 is provided with a flared rim, the edges of which abut the internal walls of the opening 116 to form an airtight seal. If a reduced pressure exists in the container as a consequence of expelling fluid through the nozzle arrangement, the pressure differential between the interior of the container and the external environment causes the flared rim of the member 115 to deform inwards, thereby permitting air to flow into the container from the external environment. Once the pressure differential has been equalised, the flared rim returns to its original configuration resiliently biased configuration to prevent any further flow through the opening 116. It shall also be appreciated that if the container is inverted, the product cannot leak past the rim of the resiliently deformable member 115 and any pressure that is applied, by squeezing the container for example, simply pushes the flared rim into tighter abutment with the walls of the opening 116.
In an alternative embodiments, the air leak valve may be a post or flap positioned within a hole which can resiliently deform to open the passageway when a pressure differential exists, thereby allowing air to flow into the container from the external environment.
As a further alternative, the resiliently deformable upper part 402 could comprise a fine slit above an opening similar to opening 1102. This slit could be configured to open when a pressure differential exists.
During use, an operator will press the outer surface of the portion 102b of the upper part inwards, which is the resiliently deformable portion of the body defining the chamber. This portion of the upper part can be easily pressed into abutment with the upper surface of the portion 101b of the base and thereby compresses the internal chamber defined there between and causes the pressure therein to increase. When the pressure exceeds a predetermined minimum threshold value, the flap 105 will be displaced from its resiliently biased position to define an opening through which liquid can flow through the remainder of the outlet passageway to the outlet orifice where it is ejected in the form of a spray. As soon as the pressure within the chamber falls back below the predetermined minimum threshold value, the flap 105 will return to its resiliently biased configuration to close of the outlet passageway. When the applied pressure is removed from portion 102b of the upper part 102 it will return to its resiliently biased position and the volume of the chamber will increase. This causes the pressure within the chamber to decrease and the flap 109 of the inlet valve to be displaced to permit more liquid to be drawn into the chamber through the inlet valve.
A further example of a nozzle device adapted to dispense fluid in the form of a spray is shown in
The example shown in
In the embodiment shown in
The flap is deflected from the side 106a to define an opening through which fluid can flow when the required pressure is achieved in the chamber 201. Fluid then flows along the outlet passageway to the outlet orifice (not shown) and on its way passes through an expansion chamber 204 formed by aligned recesses formed on the opposing abutment surfaces 102a and 101a.
To ensure a tight abutment between the upper part 402 and the base 401, various clip features 1220 are provided on the abutment surface of the upper part. The clip 305 formed on the abutment surface of the upper part 102 engages with recesses/cavities formed in the abutment surface 111a of the base to locate and secure the upper part and the base together.
The embodiment shown in
The base part 401 comprises a screw-threaded recess in its underside to enable the body to be secured to a screw-threaded neck of a container, effectively forming a screw-threaded cap. The upper part 402 is fitted to the upper surface base part 401 as shown in
A perspective view of the base part 401 is shown in
Positioned within recess 502, and just inside the edge 504, is a channel 506, the significance of which will be come apparent in the discussion of FIGS. 6 below. Also positioned in the region 502a of the recess 502 is an inlet opening 503, through which fluid may be drawn into the nozzle device from the associated container during use. The opening of the inlet 503 is positioned within a further recess 503a, the significance of which will again become apparent in the discussion of
The under surface of the upper part 402 is shown in more detail in
The internal structure and operation of the nozzle device 400 shown in
Therefore, during use, the resiliently deformable portion of the upper part 402, in the region 602a can be deformed downwards by the application of a pressure by, for example, an operator's finger pressing this region. The application of a pressure causes the volume of the chamber 700 to reduce and the pressure therein to increase. When the pressure within the chamber exceeds a predetermined minimum threshold value, the abutment surface 602b of the upper part will be caused to deform away from the opposing surface 502b of the base to define an open outlet passageway through which the fluid present in the chamber may pass through and be expelled through the outlet 403 of the nozzle device. It will be appreciated that fluid is prevented from flowing out of the chamber through the inlet by the flap 603. As fluid is ejected, the pressure within the chamber 700 will gradually fall as the fluid present within the chamber is dispensed and when it falls below the minimum threshold value the resiliently deformable abutment surface of the outlet passageway 602b will deform back to position whereby it abuts the surface 502b and the and the outlet passageway is closed.
If the pressure applied to the chamber in the region of 602a is then removed, the pressure within the chamber will decrease as the chamber deforms back to the expanded configuration by virtue of its inherent resilience. This reduction is pressure causes fluid to be drawn into the chamber through the inlet because the pressure differential between the inlet 503 and the chamber 700 causes the flap projection 603 to be deflected away from the inlet orifice. Once the portion 602a of the upper part of the body assumes its initial resiliently biased configuration, the flap projection 603 deforms back to the position shown in
As an alternative, the body of the embodiment shown in FIGS. 4 to 7 could be manufactured from a flexible plastic material. The dispenser could be made by any suitable moulding procedure. For example, the base 401 and upper part 402 could be moulded separately and then connected together either in the same mould or in separate moulds or, alternatively, one of the parts could be moulded first and the other part can be moulded onto the first part.
In this embodiment, the upper part is formed entirely from a rigid plastic material, but, in alternative embodiments, the upper part may comprise a framework of a rigid plastic (the same as that of the base) to which a flexible plastic material is over-moulded.
The main advantage of the embodiment shown in
A further example of a nozzle device adapted to dispense fluids as a bolus of liquid rather than as a spray is shown in
Specifically, the outlet 403 of the device 1401 has been modified so that the product is dispensed downwards in the direction of arrow 1405. Of course it shall be appreciated that the outlet may be configured to dispense the product at any angle (e.g. at 30-45° to the vertical).
The outlet passageway has also been further adapted to incorporate a locking means. The locking means comprises a plug 1406 formed on the upper part 402. The plug extends to form a button 1407 on the upper surface of the upper part 402, which can be pressed to urge the plug 1406 into a sealing engagement with the outlet orifice 703, as shown in
A generally L-shaped member 1408 having a lip 1408a hangs down from the base of the plug 1406 and protrudes through the outlet 703. When the plug is in a sealing engagement with the outlet 703, as shown in
The seal formed by the ridge 601 being received within a corresponding groove 506 has also been modified in two respects. Firstly, the seal extends around the entire perimeter of the chamber 700 and additionally, encompasses the outlet passageway defined between the abutment surfaces of portion 502b of the base and 602b of the upper part. Therefore, a complete seal is formed to prevent fluid seeping between the upper part 402 and the base part 401 and leaking out of the nozzle. Secondly, the thickness of the ridge protrusion tapes towards its base and the width of the groove 506 tapers correspondingly towards its opening. Hence, the ridge 601 can be pushed, or snap fitted, into the groove 506 to form a tight sealing engagement, which also functions to hold the upper part 402 the base 401 together.
The flap valve member 603 at the inlet has also been provided with a support arm 1420. The support arm 1420 is configured to resiliently bias the flap 603 over the inlet orifice and thereby increases the strength of the seal formed there between, as well as the pressure required to cause the flap 603 to deform away and open the inlet 503 during use.
The pump dispensers shown in FIGS. 1 to 9 comprise a generally dome-shaped protrusion on the upper surface, which must be pressed by an operator to compress the chamber and cause the contents stored therein to be expelled through the outlet. One potential problem with such designs is that the operator needs to press the dome using their finger, which requires the operator to position their finger in the correct location to ensure that the chamber is fully compressed. It has also been found that a relatively high pressure is required to press the dome to a sufficient extent, which can be a further disadvantage, especially as it is commonplace for people to actuate conventional pump dispensers by applying pressure with a different portion of the their hand, such as using their palm, or even using their elbow or forearm. In these instances, it would be much more problematical to adequately compress the dome using, for example, the palm of the hand in order actuate the ejection of fluid from the device.
Accordingly, a further modified embodiment of the present invention has been developed that can be actuated by an operator using any part of their hand or arm, and this embodiment is illustrated in
Referring to
The upper part forms the first portion/actuator surface 602a of the body of the device. The second resiliently deformable portion of the body device is provided by the resiliently deformable side wall 2504 of the base. The wall 2504 is resiliently biased to assume the configuration shown in
When a pressure is applied to the actuator surface 602a in the direction of arrow 2505, the resiliently deformable wall 2504 deforms such that the actuator surface is displaced towards the portion 502a of the upper surface of the base, thereby compressing the chamber. The increased pressure within the chamber displaces the plug 1406 from the outlet 403 and fluid is dispensed from the chamber. Any suitable outlet valve described herein may be used instead of the plug 1406. When the applied pressure is released, the wall 2504 returns to its initial resiliently-biased configuration, as shown in
The plug 1406 effectively functions as a pre-compression valve ensuring that fluid is only dispensed from the chamber 700 when the pressure therein is sufficient to displace the plug 1406 from the outlet orifice. In order to enable fluid to pass the plug 1406 it is preferably hollow so that it can deform to define a channel or, alternatively, it may be displaceable in which case there must be sufficient space above the plug to enable it to deform.
In addition, the device may optionally include a locking member 2510 which is integrally formed with the upper part 402 and can be swung into abutment with the base 401, as shown in
The main difference between this embodiment and those previously described is that the actuator surface 602a of the upper part 402 is substantially rigid and does not deform when a pressure is applied. Instead, the resilient deformation occurs in the wall 2504. This provides an advantage in that the operator actuator surface provides a solid point of contact for the operator. Furthermore, an operator can use any part of their hand, or even arm, to actuate the dispensing of fluid from the container. This arrangement also provides and increased mechanical efficiency.
A further difference is that a much higher percentage of the body is caused to move when a pressure is applied.
Although the embodiment shown in
A further modified embodiment of the present invention is shown in
In alternative embodiments the fluids dispensed from each chamber may mix, rather than passing out through separate outlets, which occurs with the embodiment shown in
Again, the actuator member provides a rigid actuator surface that an operator can press in order to actuate the device.
It shall be appreciated that the description of the embodiments of the invention described in reference to the figures is intended to be by way of example only and should not construed as limiting the scope of the invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0303698.5 | Feb 2003 | GB | national |
| 0305597.7 | Mar 2003 | GB | national |
| 0308909.1 | Apr 2003 | GB | national |
| 0310244.9 | May 2003 | GB | national |
| 0318022.1 | Aug 2003 | GB | national |
| 0320720.6 | Sep 2003 | GB | national |
| 0327423.0 | Nov 2003 | GB | national |
| 0400858.7 | Jan 2004 | GB | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/GB04/00610 | 2/17/2004 | WO | 4/18/2006 |
