Patent Application
20070228065
The present application is related to Applicant's co-pending International patent applications WO-A-2005/005280, WO-A-2005/004785, WO-A-2005/004786 and WO-A-2005/004787 which respectively claim priority from UK patent applications nos. 0316345.8, 0316352.4, 0316348.2 and 0316355.7, all filed on 11 Jul. 2003. The contents of these International and UK applications are incorporated herein by reference.
The present invention relates to a dispenser for dispensing unit products. The unit products may, for instance, be pills, such as pharmaceutical pills. The term “pill” is meant to embrace tablets, capsules, caplets and other solid oral dosage forms, whether pharmaceutical or otherwise.
Pharmaceutical unit products are often supplied in containers which have a closure. The closure is generally releasably screw-fitted to the container with a child resistant connection to prevent accidental removal of the closure by a child.
A child resistant closure connection can be any type of releasable connection which requires two different types of force to be applied for separation of a closure and container. There are many different types of child resistant closure connection. A common type of connection is one which requires the closure to be pushed down onto the container whilst at the same time the closure is rotated relative to the container. This way, a child, who is unlikely to be able to coordinate the application of a pushing force at the same time as a turning force, cannot gain access to the contents of the container.
Once a container is opened, a user generally has access to the entire contents of the container and it is up to the user to ensure that the correct quantity of unit products are removed for a given prescription. There is no way of keeping a record of how many unit products have been removed from the container. This requires the user to have some degree of self-control when taking medication.
It is therefore an aim of the present invention to provide a device which dispenses a predetermined quantity of unit products from a container.
It is a further aim of the present invention to prevent dispensing of products and prevent access to the contents of the container by proscribed users (e.g. children).
In a first aspect of the present invention, there is provided a dispenser for dispensing unit products comprising:
a container for containing the unit products having an access opening;
a dispensing module releasably connectable by a first type of child resistant closure connection to the container over the access opening and having an internal volume for receiving products from the access opening in the container and from which said unit products can be dispensed via an outlet opening in the dispensing module; and
a closure releasably connectable to the dispensing module by a second type of child resistant closure connection to close said outlet opening.
A child resistant closure connection is defined as any type of releasable connection which requires two different types of force to be applied for separation of the closure, container or dispensing module from each other.
The bodies of the container, dispensing module and closure are preferably formed from a plastics material or glass. The plastics material may be a polyethylene, for instance low density polyethylene (LDPE), or polypropylene (PP), for example.
The provision of two different types of child resistant closure (CRC) connections in the dispenser ensures that only one of the connections can be released at a time.
In one embodiment of the present invention, the dispensing module further comprises a first connector structure adapted to releasably engage the container. Additionally, the container may comprise a first connector structure adapted to releasably engage the dispensing module.
Preferably, the first connector structure comprises a screw thread. A dispensing module and container employing screw threads alone for releasable connection are simple to separate.
In one advantageous embodiment of the invention, the dispensing module further comprises a first locking element configured to prevent unidirectional disengagement of the dispensing module from the container. Preferably, the first locking element is a tab adapted to engage a recess on the container.
Alternatively, the first locking element is a recess adapted to engage a tab on the container.
In a second advantageous embodiment of the invention, the container further comprises a first locking element configured to prevent unidirectional disengagement of the dispensing module from the container. Hence, an uninformed user of the dispenser, for example a child, will find it difficult to separate the dispensing module and container to gain access to the contents of the container.
Unidirectional disengagement includes disengagement in a single direction, which may be a circumferential direction.
Preferably, the first locking element and first connector structure are arranged to permit disengagement of the dispensing module from the container by a squeeze and turn action. This action is difficult for a child to perform because it requires a predetermined compressive force to be applied to particular locations on the sides of the container or dispensing module at the same time as the container and dispensing module are rotated relative to each other.
Preferably, the dispensing module further comprises a second connector structure adapted to releasably engage the closure. Alternatively, the closure comprises a second connector structure adapted to releasably engage the dispensing module. Advantageously, the second connector structure may comprise a screw thread.
In one advantageous embodiment of the invention, the dispensing module further comprises a second locking element configured to prevent unidirectional disengagement of the dispensing module from the closure. Preferably, the second locking element is a tab adapted to engage a recess on the closure. Alternatively, the second locking element is a recess adapted to engage a tab on the closure.
In a second advantageous embodiment of the invention, the closure comprises a second locking element configured to prevent unidirectional disengagement of the dispensing module from the closure. Hence, an uninformed user of the dispenser, for example a child, will find it difficult to separate the dispensing module and closure to gain access to the contents of the dispensing module.
Preferably, the second locking element and second connector structure are arranged to permit disengagement of the dispensing module from the closure by a push and turn action. This action is difficult for a child to perform because it requires a predetermined compressive force to be applied to one end of the closure or dispensing module at the same time as the closure and dispensing module are rotated relative to each other.
In one embodiment of the invention, the closure further comprises a clutch and the second connector structure is free to rotate in the closure and is prevented from rotating in the second connector structure on engagement on the clutch by application of a force on the closure in a direction towards the dispensing module. A clutch can be molded into the closure on manufacture and is therefore a cost-effective way of providing a closure for removal by a push and turn action.
Advantageously, the second locking element may be operable to permit disengagement of the closure and dispensing module in a different manner to that required for disengagement of the dispensing module and container. Hence, if the first locking element and first connector structure are arranged to permit disengagement by a squeeze and turn action and the second locking element and second connector structure are arranged to permit disengagement by a push and turn action, the dispensing module will not become detached from the container when the closure is removed and vice-versa.
Preferably, the first and second connector structures are complementary to one another, such that the closure is also connectable to the container in place of the dispensing module. Hence, when it is required to provide a closure for the container without the dispensing module in place, the closure normally used on the dispensing module can be used in place of the dispensing module and a child resistant closure connection will still present.
The dispenser may include the unit products. The unit products may be pharmaceutical products and the pharmaceutical products may be oral dosage forms. Advantageously, the dispenser may comprise a tamper-evident structure to show whether the dispensing module is subsequently disconnected from the container. The tamper-evident structure may be applied across a boundary between the dispensing module and the container and may be a label.
In a second aspect of the present invention there is provided a dispenser for dispensing unit products comprising:
a container for containing the unit products having an access opening;
a dispensing module releasably connectable to the container over the access opening and having an internal volume for receiving products from the access opening in the container and from which said unit products can be dispensed via an outlet opening in the dispensing module; and
a closure releasably connectable to the dispensing module;
wherein the container and the dispensing module are releasably connectable through respective first connector structures, the dispensing module and the closure are releasably connectable through respective second connector structures, and the first and second connector structures are of different connector types such that removal of the closure from the dispensing module does not effect removal of the dispensing module from the container.
In a third aspect of the present invention, there is provided a dispensing module for connection to a container for unit products and for connection to a closure as described above.
The dispensing module may provide at least a first type of child resistant closure connection to which a container can be fitted and a second type of child resistant closure connection to which a closure can be fitted.
Preferably, the dispensing module preferably provides a dispensing mechanism which operates to dispense a predetermined number of unit products from the outlet opening on actuation thereof.
Other aspects and preferred features of the invention are set out in the claims (including those in the related applications referred to above) and in the exemplary embodiment hereinafter to be described with reference to the accompanying drawings.
FIGS. 6A-C are perspective end views of the dispensing module showing how a battery can be replaced in the base of the dispensing module;
FIGS. 7A-E are longitudinal sectional views of the dispensing module in an inverted position illustrating its operation to dispense a pill therefrom and showing the internal channel structure of the module;
FIGS. 9A-C are schematic views illustrating the dispensing of a pill from the dispensing module;
FIGS. 10A-C correspond to FIGS. 9A-C, but show the inclusion of switches to control operation of an electronic dose counter of the dispensing module;
FIGS. 13A-C are perspective side views of the dispenser comprising the bottle and the lid of
In the drawings, there is shown a hand-held dispenser 1 of the invention for dispensing pills 3, in this embodiment pharmaceutical pills. The dispenser has a container or bottle 100, a lid 200 and a dispensing module 300 releasably mountable on the bottle 100.
Referring to
The neck 105 has an outer circumferential surface 109 on which is provided a screw thread profile 111.
The lid (or closure) 200 has an annular skirt 201 which depends from an end wall 203. The annular skirt 201 has an inner circumferential surface on which is provided a screw thread profile (not shown) which is complementary to the screw thread profile 111 on the bottle neck 105. In this way, the lid 200 is able to be screwed onto the bottle neck 105 to sealingly close the access opening 107. The screw fitting between the bottle 100 and the lid 200 is of a child-resistant nature, i.e. a force additional to turning is needed to remove the lid 200 from the bottle 100. The closures shown in the drawings are a “squeeze-and-turn” closure for disconnecting the container 100 and dispensing module 300 and a “push-and-turn” closure for disconnecting the dispensing module 300 and closure 200. The feature of child resistant closure (CRC) connections on the dispensing module 300, lid 200 and container 100 is described in further detail below with reference to FIGS. 13A-C.
As shown in
The lower end 303 defines an annular skirt 313 about the lower opening 309 having an inner circumferential surface 315 on which is provided a first screw thread profile 317 complementary to the screw thread profile 111 on the bottle neck 105. Thus, the dispensing module 300 is able to be screw mounted onto the bottle neck 105, in similar fashion to the lid 200. The first screw thread profile 317 forms a child-resistant connection with the bottle neck screw thread profile 111, and is conveniently identical to the lid screw thread profile.
At the module upper end 305 there is located a nozzle 319 of tubular form having a lumen 321 which defines the upper opening 311. The nozzle 319 is arranged for sliding movement in the dispensing module 300 along its longitudinal axis. A spring or other biasing mechanism 320 (see
The nozzle 319 has an outer circumferential surface 323 on which is provided a second screw thread profile 325 of the dispensing module 300. The second screw thread profile 325 is complementary to the lid screw thread profile thereby enabling the lid 200 to be screwed onto the nozzle 319 when in its rest position to close the upper opening 311, as shown in
Again, the second screw thread profile 325 co-operates with the lid screw thread profile to form a child-resistant closure connection. Conveniently, the second screw thread profile 325 is identical to the screw thread profile 111 on the bottle neck 105.
The child-resistant closure (CRC) connection provided for connecting the dispensing module 300 to the lid 200 is advantageously of a different type to the child resistant connection provided for connecting the dispensing module 300 to the container 100. However, the lid 200 may still connect with a child resistant closure (CRC) connection to the neck 105 of the bottle.
The feature of child resistant closure (CRC) connections on the dispensing module 300, lid 200 and container 100 is described in further detail below with reference to FIGS. 13A-C.
It will therefore be seen that the dispenser 1 enables the lid 200 to be replaced on the bottle 100 by the dispensing module 300 and then in turn mounted on the nozzle 319 to close the upper opening 311 of the module 300 (the “assembled state”). Thus, the dispensing module 300 can be mounted on a standard pill bottle and be closed by the lid for the standard bottle. This is shown in
As shown in
As shown in
When the dispenser 1 is inverted in its assembled state, the pills 3 are gravity fed from the bottle 100 into the dispensing module 300 through the communicating access and lower openings 107,309. The pills 3 so transferred into the dispensing module 300 are funneled firstly by the tapered sides 330 into the lower slot section 332. In this regard, the tapered sides 330 act to funnel the pills 3 into the slot 331 in the same predetermined orientation. In this embodiment, the pills 3 are circular and funneled into the slot 331 in a radial orientation so that they are arranged circumference-to-circumference in the slot 331.
The pills are then gravity fed into the upper slot section 334 by the tapered base surface 336 of the lower slot section 332. In this way, a single-line queue 333 of pills 3 is formed in the upper slot section 334, as shown in
Preferably, the lower and upper slot sections 332,334 have dimensions relative to the pills 3 as shown in FIGS. 8A-B. That is to say, the lower slot section 332 preferably has a depth d1 from its entrance to the side edge of the tapered base surface 336 which is greater than 1.5 times the pill diameter pd.
Furthermore, the upper slot section 334 preferably has a minor width d2 at its entrance which is less than the pill diameter pd, but greater than the pill width pw. This enables dispensing of the pills 3 to occur while preventing or inhibiting the pills jamming and disabling operation. It allows pills 3 already in the dispensing module 300 to move down the slot 331 even when pills 3 are blocking the entrance 329.
As will now be described with reference to
The movable part 353 comprises a first switch member 357 on a first side of the nozzle lumen 321, and a guide member 359 on the opposite side of the nozzle lumen 321. The first switch member 357 is arranged so as to slide over the outer surface of the upper slot section 334 when the nozzle is depressed, whereas the guide member 359 is arranged so as to slide inside the upper slot section 334.
The first switch member 357 has a resilient arm 358 which is biased to an outboard rest state. This is the open state of the first switch member 357. The guide member 359, on the other hand, has a curved guide surface 360 which, in the rest position of the nozzle 319, forms an extension of a side wall 340 of the upper slot section 334 at the outlet end thereof.
As shown in
When the nozzle 319 is in its outboard, rest position, the movable and stationary parts 353,355 co-operate to form a barrier across the upper opening 311, i.e. the gate 351 is closed. This is shown in
As mentioned previously, when the dispenser 1 is inverted, a queue 333 of pills 3 forms in the slot 331. As will be appreciated from
As shown in
As shown in
As further shown in
Return of the nozzle 319 to its rest position closes the gate 351 in preparation for the next dispensing cycle.
It will therefore be understood that the dispenser 1 has a dispensing mechanism 350 which operates to dose one pill 3 from the dispenser 1 per actuation.
From
As shown in
The electronic counter 400 is powered by a battery 402, e.g. a 3 volt CR2016 lithium cell or similar capacity variant, and has a printed circuit board (PCB) 403 on which is mounted a microcontroller (not shown), e.g. an Epson S1C60N16, and other appropriate electronic componentry, as will be understood by the skilled person in the art. The microcontroller is programmed to control the number displayed on the display 401, and in this connection may be connected to the display 401 through an elastomer, such as a flexible heat-seal connector. Moreover, the microcontroller is electrically connected to the first switch member 357 forming part of the gate 351 and also to a second switch member 367 carried by the nozzle 319 (FIGS. 10A-C).
Thus, the microcontroller receives a first electrical input signal when the resilient arm 358 of the first switch member 357 is closed as it interacts with the leading pill 3 as the nozzle 319 is depressed. In other words, the first input signal is indicative that a pill 3 has passed the first switch member 357 and has been dispensed. Alternatively, the first switch member 357 may be configured such that it is closed, and hence produces the first input signal, when the gate 351 is closed. For instance, by the leading pill 3 bearing against the switch arm 358 when the dispenser 1 is inverted.
The second switch member 367 also has a resilient arm 369. The resilient arm 369 of the second switch member 367 is biased to an open position, but when the nozzle 319 is actuated it abuts an internal surface 371 of the nozzle 319 (FIGS. 10A-C) causing it to close. This results in a second electrical input signal being received by the microcontroller, which signal is representative of the nozzle 319 have been depressed a sufficient amount to effect dispensing (i.e. actuated).
Thus, the microcontroller receives two input signals, each independently indicating dispensing. Both signals are required to be received by the microcontroller for it to act to decrement the number on the display 401. This is because the first input signal indicates the presence of a pill 3 (the leading pill) at the gate 351 due to its dependence on a pill triggering the first switch member 357, while the second input signal represents full travel of the nozzle 319 which should ensure dispensing of the pill 3 detected by the first switch member 357. This provides a fail-safe mode of counting.
When the dispenser 1 is first used, the microcontroller is programmed to display the “label claim” of pills contained therein. This may be a factory setting, or set by the prescribing medical practitioner or pharmacist. Each time the dispenser 1 is actuated, and the microcontroller receives the two input signals, which may be required to be simultaneously received or, more likely, sequentially (i.e. the first switch member 357 re-opens before the second switch member 367 closes), perhaps within a specified time period, it operates to cause the electronic display to decrement the number displayed by one. There may also be a requirement that both switches 357,367 need to be re-opened for the microcontroller to update the display 401. That is to say, the microcontroller is programmed or configured such that it will only operate to decrement the count when the two input signals are not only received, but switched-off by the switches re-opening. This adds a further fail-safe.
Of course, the dispenser 1 could be operated with just one of the switch members 357,367. For instance, as represented in
Eventually, the display 401 will record that no pills 3 are left. In this regard, the microcontroller may be programmed to cause the display 401 to flash when the number of pills left is at or below a predetermined threshold to warn the user that a new supply of pills is, or will shortly be, needed. As an example, the microcontroller may operate to cause the display to flash the number displayed. The display 401 may flash when the number displayed is zero.
In addition to the counter function, the microcontroller and electronic display are also operatively connected such that a ‘time since last dose’ function is displayed by the display 401. This is particularly useful when the pills 3 are pharmaceutical pills.
As shown in
After the microcontroller registers the dispensing of a pill 3 through triggering of the first and second switches 357,367, a timer in the microcontroller is activated and at predetermined intervals thereafter discrete time segments 413 are displayed on the display 401 adjacent the scale 409. In this embodiment each time segment 413 represents two hour periods, although again other time periods could be represented. Thus, after two hours from last dispensing, a first time segment 413 is displayed in the first section of the scale. This is repeated after each further two hour period until another pill is dispensed to re-set the ‘time since last dose’ function. Preferably, as each new time segment 413 is displayed, the previous time segments 413 remain resulting in a time segment chain being formed.
The user of the dispenser 1 will know the dosing regime for the pills 3 (i.e. the time interval between pill taking), either from the prescribing medical practitioner, pharmacist or information leaflet packed with the dispenser 1, and is provided with a visible indication of the time left till the next pill dose is needed, or of the lateness of the next dose. Thus, the dispenser 1 aids in compliance of the user in following the prescribed dosing regime. If need be, the microcontroller can be pre-programmed to cause the display to flash when the time since the last dose corresponds to the prescribed dosing regime, e.g. by flashing the time segments and/or the number of pills left.
A preferred display 401 for the dispenser 1 is shown in
FIGS. 6A-C show the sequence of steps for removing the battery 402 from the dispensing module 300 for replacement with a new battery. More particularly, the battery is held in a battery holder 425 having a recess 427 for accommodating the battery 402. The battery holder 425 is slidably mounted into a slot 429 formed in the tapered side 330 in the cylindrical entrance 329 at the lower module opening 309. To this end, the battery holder 402 has a tapered surface 431 so that, when slid into the slot 429, it sits flush with the tapered side 330. To remove the battery holder 425 to replace the battery 402, a screw driver or other like implement is used to lever the battery holder 425 out of the slot 429.
By enabling the battery 402 to be replaced enables the dispensing module 300 to be re-usable. Nonetheless, the dispensing module 300 may be configured such that the battery 402 is not able to be removed, e.g. in the event the module 300 is designed to be a single-use component which is to be disposed of after use.
For tamper-proofing of the dispenser 1, a label 500 can be wrapped around the dispenser 1 so as to cover the bottle and the dispensing module 300, as shown in
FIGS. 13A-C show the operation of child resistant closure (CRC) connections between the dispensing module 300 and the container 100, and the dispensing module 300 and the lid 200 according to one embodiment of the invention.
A child resistant closure (CRC) connection is any type of connection which prevents easy removal of a closure to any type of container (which may include a dispensing module). Generally, easy removal is achieved through unidirectional movement of the closure or container relative to each other so that access to the container is achieved. Unidirectional movement is movement in a single linear or circumferential direction. For example, a closure may comprise a screw thread and can become detached from the container by simply rotating it in one direction. Alternatively, a closure may be a hinged lid which is opened by rotating it about its hinge. Therefore, some types of child resistant connection (CRC) operate by requiring more complex movement of the closure or container in two or more directions.
The annular skirt 313 of the dispensing module comprises a tab 802. The body 301 of the dispensing module 300 is constructed from resilient material such that on application of inwardly directed forces on opposite sides of the body 301, the body 301 flexes outwards at a position 90 degrees about the longitudinal axis of the dispensing module 300 from the points of application of the forces. Hence, if the inwardly directed forces are applied at 90 degrees from the tab 802, the tab 802 will flex outwards. The container 100 comprises a notch 804 into which the tab 802 will fit when the dispensing module 300 is screwed on to the container 100. When the tab 802 is located in the notch 804, rotation of the dispensing module 300 is prevented and the dispensing module 300 is locked to the container 100. By applying inwardly directed forces on each side of the body 301 at 90 degrees from the position of the tab 802, the tab 802 is forced outwards and thereby released from the notch 804 such that the dispensing module 300 can be unscrewed from the neck 105 of the container 100. The tab 802 and notch 804 are dimensioned such that the tab 802 fits into the notch 804 when the dispensing module 300 is screwed down fully onto the container 100. A click may be heard as the tab 802 locks into the notch 804. This type of child resistant closure (CRC) connection can be referred to as a “squeeze-and-turn” connection. Hence, forces in two directions are required to release the dispensing module 300 from the container 100, specifically: (i) an inward radial force on the skirt 313; and (ii) a circumferential force on the body 301 of the dispensing module 300.
At a position 90 degrees around the circumference of the skirt 313 from the tab 802, there may be a disrupted surface 806 which acts as a grip for application of a turning force to the dispensing module 100. The disrupted surface 806 also marks the point at which a user should apply an inwardly directed force. The disrupted surface 806 may be vertical or horizontal parallel grooves formed in the surface of the body 301.
The lid 200 comprises an alternative type of child resistant closure (CRC) connection to that employed between the dispensing module 300 and the container 100. The provision of two different types of child resistant closure connections between the dispensing module 300 and the container 100, and the dispensing module 300 and the lid 200 ensures that the dispensing module 300 is not released from the container 100 as the lid 200 is disengaged from the dispensing module 300, and alternatively that the lid 200 is not released from the dispensing module 300 as the dispensing module 300 is disengaged from the container 100.
a and 14b show one type of child resistant closure (CRC) connection employed in the lid 200. The lid 200 comprises an inner connector structure 910 on which a screw thread 912 is formed for engaging with the second screw thread 325 of the dispensing module 300. The inner connector structure 910 is generally free to rotate in one direction in an outer shell 920 of the lid 200 when no vertical force is applied to the cap 200. The outer shell 920 and inner connector structure 910 are formed as separate cup-like components which are mated with each other during manufacture. A first lip 914 around the circumference of an outer surface of the inner connector structure 910 engages with a second lip 924 around an inner surface of the outer shell 920 to hold the inner connector structure 910 within the outer shell 920. The inner connector structure 910 is movable in a vertical direction to a limited extent inside the outer shell 920, but the outer shell 920 is prevented from being removed from the inner connector structure 910 by the presence of the first and second lips 914, 924.
The outer shell 920 and inner connector structure 910 form a clutch mechanism. The clutch mechanism includes first teeth 915 located around the outer circumference of a first side wall 913 of the inner connector structure 910 and second teeth 925 located around the inner circumference of a second side wall 923 of the outer shell 920.
The first and second teeth 915, 925 are saw-tooth shaped with a first engaging edge 931 and a second engaging edge 932. The first engaging edge 931 is arranged vertically with respect to a longitudinal axis 990 of the cap 200 and the second engaging edge 932 is arranged at an angle with respect to the longitudinal axis 990. The angle may be 45 degrees relative to the longitudinal axis 990.
When the first teeth 915 and second teeth 925 are engaged with each other, the inner connector structure 910 is locked to the outer shell 920 such that rotation of the outer shell 920 in a clockwise direction 980 rotates both the outer shell 920 and inner connector structure 910 because the first engaging edge 931 of each of the second teeth 925 engages with a corresponding first engaging edge 932 of each of the first teeth 915. This way, the cap can be secured to the dispensing module 300 by rotating the outer shell 920 in a clockwise direction so that rotational force is transmitted to the inner connector structure 910 through the first engaging edges 931, thereby permitting the inner connector structure 910 to be screwed on to the dispensing module 300. Rotation of the outer shell 920 in an anti-clockwise direction 981 whilst the inner connector structure 910 is screwed on to the dispensing module 300 will cause the second engaging edges 932 of both the outer shell 920 and inner connector structure 910 to move over each other because these edges are at an angle with respect to the longitudinal axis 990. This way the outer shell 920 is not locked to the inner connector structure 910 and therefore the inner connector structure 910 cannot be unscrewed from the dispensing module 300. However, when a vertical force is applied in a direction along the longitudinal axis 990 towards the dispensing module 300, the friction force between the second engaging edges 932 of the inner connector structure 910 and outer shell 920 increases. Thus, when a vertical force is applied to the outer shell 920 at the same time as an anticlockwise rotational force, the second engaging edges 932 do not move over each other as a result of this increased friction and hence the inner connector structure 910 and outer shell 920 remain locked to each other and the inner connector structure 910 becomes unscrewed from the dispensing module 300.
The cap 200 further comprises a boss 940 which comprises a lip 941. The lip 941 is dimensioned so that the boss 940 can be inserted during manufacture into the inside of the inner connector structure 910 and is then held in place by a ridge 942 located on the inner surface of the first side wall 913 of the inner connector structure 910. The boss 940 is free to rotate relative to the inner connector structure 910. On application of a vertical force to the outer shell 920 towards the dispensing module 300, a lower surface 943 of the boss 940 engages with the finger 363 in the nozzle 321 of the dispensing module 300. Thus, an upper surface 944 of the boss 940 is forced against an end wall 945 on the inside of the inner connector structure 910 to force the first teeth 915 of the inner connector structure 910 to engage the second teeth 925 of the outer shell 920 and ensure that the second engaging surfaces 932 of the outer shell 920 and inner connector structure 910 are forced together. This way, the reaction force to a vertical force applied to the cap 920 is not transmitted via the screw thread 912 which would increase the frictional force in the thread and hinder removal of the cap 200 from the dispensing module 300.
This type of child resistant closure (CRC) connection can be referred to as a “push-and-turn” connection. Hence, forces in two directions are required to release the dispensing module 300 from the container 100, specifically: (i) a downward axial force on the end wall 203; and (ii) a circumferential force on the skirt 201.
The screw thread on the inner connector structure of the lid 200 is dimensioned to fit the screw thread on the neck 105 of the container 100 so that the lid 200 can be used as a child resistant closure (CRC) for the container 100. In this regard, reference to the dispensing module 300 in the aforementioned description of
It will, of course, be appreciated that many different types of child resistant closure can be used with the dispensing module 300, lid 200 and container 100. By using child resistant closures in which movement in two directions is required for disengagement and having at least one direction of movement that is different in each closure, then disengagement of one connection, whilst the other connection is being disengaged, can be prevented.
It will appreciated that the invention is not limited to the exemplary embodiment herein described with reference to the accompanying Figures of drawings, but may be modified, varied and adopt other guises within the scope of the appended claims. As an example, the dispenser need not have a counter. For example, FIGS. 9A-C show a dispensing mechanism which does not rely on a switch member.
| Number | Date | Country | Kind |
|---|---|---|---|
| 0411553.1 | May 2004 | GB | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/US05/17722 | 5/20/2005 | WO | 11/16/2006 |
