Field of the invention
The present invention relates to a dispensing device for detergent in tablet
form.
Background of the invention
Detergent compositions formed in non particulate solids such as bars or
tablets or briquettes are known in the art. In the following, the term "tablet" will
refer to any form of non particulate solids. The tablet provides a number of
advantages to both the consumer and the manufacturer. Indeed, the tablet
prevents spillage of the detergent composition. Furthermore, the tablet
eliminates the need for the user to estimate the dosage of detergent
composition required and ensures that the correct dosage of detergent
composition per wash cycle is used by the user.
To further simplify handling and in order to maximise dissolution, thus
performance of the detergent tablet, many detergent compositions
manufacturers provide the consumer with dispensing devices in which to place
the detergent tablet prior to being placed in the washing machine. Indeed,
dispensing devices in the form of baskets or cradles are often utilised for
example in automatic dish washing machines to maximise the performance of
the tablet.
An example of a dispensing device for tablets which may be introduced in an
automatic dish washing machine is described in co-pending European Patent
Application No. 95304115.9. This dispensing device may comprise a fastening
means which fastens the dispensing device to the interior of an automatic
washing machine such that it can be released therefrom when required. In an
automatic dish washing machine the dispensing device is usually attached to
the exterior of the cutlery basket or the crockery basket.
Usually, these dispensing devices are made such that the size of the
dispensing device is equal or bigger than the maximum amount of tablets
recommended for a wash cycle. Commonly, different dosage recommendation
are given for differently soiled loads. For example, the recommended dosage
for a wash cycle may be only one tablet for less soiled loads, two tablets for
very soiled loads. Consequently, the dispensing device has to be such to allow
the insertion of at least two tablets in this case. For this reason the dispensing
device has to be at least big enough to allow the maximum recommended
dosage of the tablets. It has been found that this is in conflict with the tendency
to reduce the volume of the packages containing the tablet together with the
dispensing device.
Indeed, since the detergent composition is already dosed and compacted
into tablets, smaller packages can be used for the packaging of the tabletted
detergent. Smaller packages means less space needed for storage and
transportation, therefore also logistic and cost improvements of the packaged
detergent are achieved. However, part of the logistic and cost improvements
may be lost when the dispensing device is included in the packages. Indeed,
the volume occupied by the dispensing device has to be further added to the
package containing the detergent tablets. Thus, part of the advantage of
reducing the space for a package resulting of detergents compacted into
tablets is lost when a dispensing device is included in the packages, especially
when the dispensing device has to be at least as big as the recommended
maximum dosage.
It is therefore an object of the present invention to provide a dispensing
device occupying less amount of volume in a package, nevertheless allowing
the insertion up to the maximum recommended amount of tablets.
Summary of the invention
The present invention is a tablet dispensing device. The tablet dispensing
device comprises tablet restraining means and a filling opening. The tablet
restraining means is liquid permeable so that a liquid passing through the tablet
restraining means and/or the filling opening dispenses the detergent tablet
when the dispensing device retains a detergent tablet. The tablet restraining
means is a flexible and resilient spring which automatically expands when a
tablets is inserted into the dispensing device.
Brief description of the figures
Figure 1 shows a front view of a dispensing device according to the present
invention without retaining any tablet.
Figure 2 shows a front view of the dispensing device of Figure 1 filled with
one tablet.
Figure 3 shows a front view of the dispensing device of Figure 1 filled with
two tablets.
Detailed description of the invention
In the following any form of non particulate solids such as bars or tablets or
briquettes will be encompassed by the term "tablet". The tablet may be made
by a detergent composition for dish or laundry washing. The tablet may have
any shape or dimension. Preferably, the solid, non particulate tablet is
symmetrical to ensure the uniform dissolution of the tablet in the wash liquor.
According to a preferred embodiment of the present invention the detergent
tablet may comprise any ingredients known in the art. Such ingredients may
include surfactants, suds suppressers, bleaches, chelants, builders, enzymes,
fillers and perfumes.
According to a preferred embodiment of the present invention the detergent
composition of the tablet is prepared in its granular or particulate form and then
formed into tablets of the desired shape and size by any one of the methods
known in the art. Suitable methods include compression, extrusion and casting.
The detergent composition may be homogeneously distributed throughout the
tablet or may comprise distinct layers of certain detergent ingredients.
The present invention provides a tablet dispensing device (10). The tablet
dispensing device comprises tablet restraining means (11) and a filling opening
(12). The filling opening allows the insertion of at least a detergent tablet into
the dispensing device. Consequently, the size of the filling opening
corresponds to the size of the detergent tablet. Also the form of the filling
opening corresponds to the shape of the tablet.
The tablet restraining means (11) holds the tablet in the dispensing device.
Consequently, a tablet inserted into the dispensing device is not able to escape
from dispensing device. The tablet restraining means is liquid permeable so
that a liquid passing through the restraining means and/or the filling opening
dispenses the detergent tablet when the dispensing device retains a detergent
tablet. In this manner the liquid can pass not only through the filling opening to
dispense the detergent tablet, but also through the restraining means. This
improves the dispensing of the detergent tablet from within the dispensing
device. Therefore a detergent tablet contained in the device can be dissolved
during a wash cycle, for example, by water. The dissolved detergent tablet
forms a wash liquor. This wash liquor is able then to exit the dispensing device
to be available in the wash cycle of an automatic dish or laundry washing
machine.
Preferably, the tablet restraining means comprise orifices or slits (15) to
make the tablet restraining means liquid permeable. The orifices or slits are
such to allow a liquid to pass through the restraining means. This enables the
tablet to be dissolved more efficiently. This means that water is able to enter
into the dispensing device and reach the tablet inside. The orifices are
preferably evenly distributed throughout the tablet restraining means. The
orifices are such that the tablet cannot be removed from the dispensing device
through the orifices. Nevertheless, the orifices are such to allow water to enter
the dispensing device for dissolving the detergent tablet during the wash cycle
of the automatic dish or laundry washing machine.
The tablet restraining means (11) is a flexible and resilient spring (14). The
flexible and resilient spring (14) automatically expands when a tablets is
inserted into the dispensing device. By expanding the tablet restraining means,
the volume available in the dispensing device is increased. Consequently, one
or more tablets can be inserted into the dispensing device according to the
present invention whereby the size of the tablet restraining means adapt
automatically to the number of tablets inserted. Preferably, the weight of the
tablets is already sufficient to achieve that the tablet restraining means
expands automatically giving space to the inserted tablet. Preferably, the
spring comprises an interrupted wall opposite the filling opening (12). The wall
being interrupted ensures liquid permeability of the interrupted wall. The
interrupted wall is such that the tablet cannot be removed from the dispensing
device through the apertures of the interrupted wall.
The dispensing device having a flexible spring allows the dispensing device
to be stored to a minimum volume. Hereinafter, "minimum volume" is the
volume of the dispensing device when no detergent tablet is inserted into the
dispensing device. This means that the dispensing device can be stored in a
package without substantially increasing the available space in a package.
Consequently, the size of the package can also be kept to a minimum.
Preferably, dispensing device in its minimum volume is such that the available
volume of the dispensing device is not sufficient to retain a detergent tablet.
The tablet restraining means (11) being also resilient allows the dispensing
device (10) to return to the configuration of minimal volume after the tablet(s)
have been dispensed. Preferably, the flexible and resilient spring (14) is shown
in Figure 1. When one or more detergent tablets are inserted into the
dispensing device, the spring unfolds making enough space for retaining the
inserted tablet(s), as shown in Figures 2 and 3. Once the tablet is dispensed,
the spring may preferably automatically return to the configuration of minimum
volume of Figure 1. This spring is preferably made of elastomeric materials,
such as polypropylene, polyethylene or polyester, or of metal, such as stainless
steel or aluminium. The spring made of metal material may also be protected
by a layer of plastic on the outside of the spring. All these materials ensure
enough compatibility with the wash solution and resistance to the temperatures
usually encountered in an automatic dish or laundry washing machines.
As another optional feature of the present invention, the dispensing device
comprises fastening means (30). As used herein, fastening means refer to any
means which can be adapted to fasten the dispensing device to the interior of
e.g. an automatic dish washing machine such that it can be released therefrom
when required by the user. The fastening means is preferably made of similar
or identical material to that of the dispensing device itself. The fastening means
may preferably be located on the tablet restraining means (11). The fastening
means preferably comprises at least a hook (32), which extends from the tablet
restraining means. Preferably, the fastening means is adapted to be fastened
on the exterior or interior of the cutlery basket of an automatic dish washing
machine.
Preferably, the dispensing device is further provided with securing means.
As used herein, securing means refers to any means which can be adapted to
secure the dispensing device to the interior of an automatic dish or laundry
washing machine such that it cannot be disengaged therefrom during the wash
cycle of the automatic washing machine. Specifically, the securing means is
adapted to prevent disengagement of the dispensing device due to forces
occurring inside an automatic dish washing machine, as for example forces
exerted by the circulation of water and/or air. Nevertheless, the securing
means does not impede the release of the dispensing device from the interior
of an automatic dish or laundry washing machine when required by the user.
Preferably, the securing means is adapted to secure the dispensing device on
the cutlery basket of an automatic dish washing machine. The securing means
is preferably made of similar or identical material as the dispensing device, but
being more flexible with respect to the dispensing device itself. Other flexible
material, like metals, may be also considered for the purpose of the present
invention.
The co-pending International Patent Application No. PCT/US95/12787
provides a dispensing device with securing means as defined before. The
securing means prevents the dispensing device (10) from disengaging from the
cutlery basket. Specifically, the securing means prevents disengagement of the
dispensing device in a direction which is opposite to the direction in which the
dispensing device is fastened with the fastening means. All the embodiments
described as securing means in the International Patent Application No.
PCT/US95/12787 are herewith incorporated by reference.
As a preferred option, the dispensing device (10) further comprises a child
resistant restraining means (Fig. 1, 40). The restraining means is adapted to
prevent the removal of the tablet through the filling opening (12) prior to the
dissolution of the tablet in the wash liquor. In particular, as used herein, the
wording child resistant restraining means refers to any mechanism whereby
access to the tablet, once inserted in the dispenser, is reduced so that the
tablet cannot be readily removed, especially by infants and children.
A possible child resistant restraining means (40) may be at least a resiliently
hingeable or deformable element located in the region of the filling opening
(12). The resiliently hingeable or deformable element is displaced from its rest
position within the interior of the dispensing device (10) by the insertion of the
tablet. The element has minimal, preferably no opposite hingeable motion or
deformability beyond its rest position, so that the tablet cannot be removed
from the hollow body once inserted therein. According to the present invention
the resiliently hingeable or deformable element may entirely close or partially
close the opening of the dispensing device. Any number and any positioning
with any configuration of the resiliently hingeable or deformable elements
around the opening may be variably chosen.
The dispensing device of the present invention may be formed from any
flexible, water resistant material that can withstand moderately elevated
temperatures, such as those reached in automatic washing machines, e.g.
about 95° C, for a relatively long period of time (about 3 hours) and which can
be formed into the desired shape. Preferably the dispensing device is made of
low cost thermoplastic material such as polypropylene or polyethylene and
formed by injection moulding.