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(11) | EP 1 157 945 A2 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Container comprising an outer receptacle and an inner receptacle |
| (57) The invention provides a container comprising an outer receptacle (8) and an inner
receptacle, the inner receptacle being in the form of a gas permeable bag (1) ; characterised in that the gas permeable bag (1) is provided at its upper edge with means (5,7) defining flaps for securing the bag to the outer receptacle. |
[0001] The present invention relates to a container, and in particular to a container for use in the collection and storage of materials.
Background of the Invention
[0002] A major problem facing most communities is the problem of waste disposal. Each day vast quantities of waste are created, and such waste must be removed and processed in a safe and hygienic manner.
[0003] For waste materials storage and collection, the main choices open other than disposal of the waste are either incineration to generate energy, or separation of the waste material into fractions for recycling or composting or anaerobic digestion. In order to help encourage the co-operation of householders and other generators of waste materials to separate waste at source in a way which helps the processor of the waste to produce what the market demands, many local authorities now provide outside waste material collection bins.
[0004] Organic waste presents particular problems due in large part to the high moisture content of the waste. In warmer weather conditions, unless the waste is adequately ventilated, unpleasant odours can build up quickly as anaerobic conditions are set up in the waste collection bins.
[0005] The cost of collection of waste materials can be significant, and one option open to waste collection authorities to reduce the cost of collections is to reduce the frequency of the collections. However, it will be appreciated that if the waste is left for longer periods, odour levels can become unacceptably high.
[0006] In addition to the problem of anaerobic decomposition, a further problem facing the collector of waste materials is the problem of infestation by vermin, insects and other small creatures.
[0007] There have been a number of disclosures by others relating to waste collection or storage bins providing an aerobic environment, but such bins are considered to have significant limitations as to their usefulness and effectiveness.
[0008] European Patent Application No. 92610025 discloses a rubbish sack holder which requires a specially designed cart to transport the holder to a collection vehicle for emptying. One consequence of this is that the sack holder cannot be used with existing collection vehicle lifting gear generally in use in many areas. A second aspect is that the sack is removed at the collection vehicle through an aperture in the side of the sack holder rather than through the top of the sack holder.
[0009] WO-A-95/01294 discloses a rather complicated arrangement which consists of an outer receptacle, an inner perforated support bag, and within the supporting bag, an inner paper bag. In the more complex, and seemingly preferred, arrangements disclosed in WO-A-95/01294, there is additionally an inner insert container in the form of a laundry-basket like arrangement thus making a total of four nested containers in total. References are made to a tightening strap or suspension device to keep the supporting bag and inner paper bag in place open at the top of the container.
[0010] US Patent No. 5031796 discloses a ventilated waste container, containing several relatively small arrays of vent holes at the upper and lower ends of the container. The container has vertical ribs which protrude inwardly from the walls of the container to function as spacers, the intention being that the spacers should prevent waste within the container coming into close contact with the walls. However, the container of US 5031796 is not specifically designed for use with inner liner bags.
[0011] My earlier application GB-A-2 327 034 discloses a container comprising an outer receptacle and, disposed therein, an inner receptacle in the form of a bag, the bag being permeable to gases, the outer receptacle having a plurality of spacers extending inwardly from an inner surface thereof, and a plurality of vents in the side walls and/or base of the outer receptacle, the spacers serving to support the inner bag such that it is spaced apart from the inner surface of the outer receptacle, and the vents serving to allow air to circulate between the bag and the outer receptacle.
Summary of the Invention
[0012] The present invention relates principally, although not exclusively, to improvements in the containers disclosed in GB-A-2 327 034.
[0013] Accordingly, the invention provides a container as defined in the claims appended hereto, and as set out below.
[0014] In one particular aspect, the invention provides a container defining an outer receptacle, the container being configured to hold therein an inner receptacle in the form of a gas permeable bag, the outer container having a plurality of spacers extending inwardly from an inner surface thereof, and a plurality of vents in the side walls and/or in the base of the outer receptacle, the spacers serving to support the inner bag such that it is spaced apart from the inner surface of the outer receptacle, and the vents serving to allow air to circulate between the bag and outer receptacle; characterised in that:
(a) the bag forming the inner receptacle has a particular shape at its aperture; and/or
(b) the bag forming the inner receptacle has perforations in at least one position extending downwards from the aperture at the top of the sack; and/or
(c) the outer receptacle has at least one outwardly convex, e.g. curved, side wall as viewed from above; and/or
(d) one of a range of suspension means at the upper end of the outer receptacle is employed to keep the bag open and in position; and/or
(e) the bag is provided with an increased level of support from inwardly extending spacers in one side wall of the outer receptacle.
[0016] The container can be a container intended for the temporary storage of waste materials, such as household, commercial or industrial waste, but it can also be used for the storage of other materials which would benefit from the improved ventilation properties of the invention.
[0017] The purpose of the suspension means, curved wall of the container, specially adapted inner bag and increased support provided by spacers in at least one wall of the container is to provide the bag with suspension means whilst ensuring that the bag can be separated without difficulty from the outer receptacle when partly inverted by the hydraulic lifting gear attached to a waste collection vehicle for the purpose of emptying the outer receptacle of inner bag and its contents.
[0018] In accordance with one embodiment of the invention, the inner receptacle in the form of a gas permeable bag, commonly a kraft paper sack, is cropped in its two top comers when in its folded state to enable the sides, commonly four in number after cutting, to be opened out like the top of a standard shaped cardboard box for attaching to suspension means. This overcomes the problem of choosing to use a sack which is larger than that needed to fit the dimensions for an inner receptacle set by the container spacers in order to provide the material need for attachment to suspension means outside the circumference of the walls of the paper sack.
[0019] Whilst it is important to attach the inner receptacle at the top to the outer receptacle to avoid the inner receptacle sinking into the outer receptacle due to gravity or physical pressure, it is also important to ensure that there is nothing to impede the emptying of the outer receptacle, Paper sacks are manufactured from rolls of paper with parallel sides with the consequence that paper sacks are no wider at the top than at the bottom. Paper sacks are also manufactured with gussets let into the sides of the sack which aids in simplifying the cuts needed to provide the necessary folds.
[0020] According to another embodiment, the properties of a paper sack with a top which can be folded out in the manner of the lid of a standard cardboard box can be achieved by machining vertical or angled sets of perforations into the top of the inner receptacle which commonly will be in the form of a paper sack in at least one position and commonly in four positions equidistant apart. The person inserting the paper sack can, without any use of equipment, produce the desired effect of an opened out inner receptacle.
[0021] The advantage of the use of perforations is that the paper sack can remain intact, should the suspension means not require the sack to be opened out at the top. Lines instead of or in conjunction with perforations can be printed in the top of the inner receptacle to provide the user with guidance on the optimum position in which to cut the paper sack.
[0022] In another embodiment, the outer receptacle has at least one wall which is curved, or more commonly two walls which are curved or three or even four curved walls are curved outwards when looked at in plan view from above. This enables the top of the inner receptacle, commonly a paper sack, to be folded outwards and fastened by suspension means without necessitating either cuts to be made in the top of the inner receptacle or the use of an over-sized inner receptacle.
[0023] Again, the problem with paper sacks is that they have parallel sides. Paper sacks which are narrower at the base than at the top can be manufactured, but at a considerable increase in unit cost.
[0024] In a further series of embodiments the suspension means employed in the outer receptacle to retain the inner receptacle takes the form of a retaining ring made of plastic or metal which is hingedly attached to the outer receptacle and mounted on the same axis as the outer container lid. The retaining ring is not provided with any retaining clips, but instead is designed to fall open under gravity and without any manual assistance, thus releasing the inner receptacle, as the outer receptacle is inverted for emptying. The degree of angle of the edge of the outer receptacle against which the inner receptacle will be pressed by the retaining ring be dictated by such considerations as the specific gravity of the retaining ring, plus the physical properties of the inner receptacle.
[0025] Should the inner container be made of a thin, light material, with the properties of a plastic sack which moulds closely to the profile of the outer receptacle and does not retain any shape, then the profile of the part of the outer container against which the inner container is pressed will be nearly vertical to achieve finer tolerances and more certain grip of the outer receptacle. Whether the inner receptacle is folded over the top of the outer container before being retained or pressed against the inside edge will be dictated by whether increased mechanical resistance or a shorter inner receptacle is more important. In such a situation, it could also be suitable to use a retaining ring with a low specific gravity.
[0026] Should the inner receptacle be made of a material with the mechanical properties of paper which has a certain amount of form stability, then the angle of the face against which the inner receptacle is pressed will be lower while the retaining ring will be either more massive or made of a denser material. Again, more resistance to slippage will be imparted by folding the inner receptacle over before placing it under the load of the retaining ring.
[0027] According to another series of embodiments the suspension means employed in the outer receptacle to retain the inner receptacle takes the form of a thin wedge mounted on and protruding downwards from the lid of the outer container which presses the inner receptacle against a profiled edge of the outer container. This wedge can be continuous or discontinuous around the top of the outer container. The point of the wedge is designed to press the inner container into an angled trench in the outer container which is designed to impede the inner receptacle from springing free when the container lid is opened. The part of the outer container against which the wedge presses the inner container is angled or vertical, and also profiled to provide the necessary resistance to minimise the chance of the inner receptacle from falling into the outer receptacle. The profiling of the part of the outer receptacle against which the inner receptacle is pressed can simply have a course finish or protruding knobs or spikes which can be designed to puncture the skin of the outer container.
[0028] Suited for use with inner receptacles such as a paper sack which retains to some extent its form when released from the retaining pressure of the wedge (i.e. the material is a mouldable deformable material), this system does away with the need for a retaining ring or other proprietary suspension means. The closing of the lid of the outer receptacle for the first time after inserting the inner receptacle, commonly a paper sack, will press the inner receptacle into place. When subsequently the lid is opened, sufficient stability provided by both the inner receptacle and design of the container will keep the sack in position. When the container is inverted to be emptied, the collection operative only needs to concern him or herself with ensuring that the lid has opened. Any danger of the contents being obstructed by other inner receptacle suspension means as the container is inverted is avoided in this economical solution.
[0029] In another embodiment, the suspension means employed in the outer receptacle to retain the top of the inner receptacle, commonly in the shape of a paper sack, comprise self-opening clips which open when the outer container is inverted. The clips, at least one in number, but more commonly two or even four are incorporated in the top of the outer container, bearing down on the top of the inner receptacle which has been folded outwards at its edges. Where the inner receptacle has been folded outwards its outer face comes into contact with a moulded surface designed to provide resistance to prevent the inner receptacle from sinking down into the outer receptacle. The self-opening feature of the clip is achieved by incorporating an inwardly projecting lever from the side of the outer receptacle which is forced upwards as the outer receptacle is inverted and the contents forced out by gravity.
[0030] The advantage of this means of suspension is that there is no need for the collector of the material to be concerned about manually un-clipping the inner container from the outer container before the container is tipped.
[0031] In yet another embodiment, the outer face of the spacers, extending inwardly from the inside face of the outer receptacle wall, which come into contact with the inner receptacle have a larger total surface area in the side of the outer receptacle which supports most of the weight of the inner receptacle as it is tipped out along with its contents. Ways of increasing the total surface area coming into contact with the inner receptacle include increasing the number of, commonly, vertical lines spacers, or their dimensions at the contact face with the inner container.
[0032] As the outer receptacle starts to be inverted, the weight of the inner receptacle supported by the spacers evenly throughout the outer receptacle starts to transfer to the lower side until a situation exists in which all the weight has been transferred to the spacers in one side wall of the outer container. It is important to minimise as far as is practically possible the resistance to tipping of the inner receptacle from the outer receptacle. This will be achieved by reducing the point loading on each spacer which will be achieved by increasing the spacer area in that wall of the outer container.
Brief Description of the Drawings
[0033] The invention will now be illustrated by way of example by reference to the particular embodiments shown in the accompanying drawings.
[0035] Figure 2 shows a paper sack in plan view from the side before it is opened out with the hatched lines indicating the line of the cut when the sack is cropped.
[0036] Figure 3 shows a paper sack slightly opened and the perforations cut into the top of the sack.
[0037] Figure 4 shows a paper sack opened out as a result of being cropped or torn apart along the perforation lines.
[0038] Figure 5 shows a container in wheeled bin format from above with two curved walls. It also shows an increased area of spacers inwardly protruding from one side wall of the container.
[0039] Figure 6 shows a container with a retaining ring hingedly attached on the same axis as the lid.
[0040] Figure 7 shows a small section of the top of the container in which the retaining ring is pressing the inner receptacle against a steeply angled retaining section of the profiled container top.
[0041] Figure 8 shows a small section of the top of the container in which the retaining ring is pressing the inner receptacle against a less acutely angled profiled container top.
[0042] Figure 9 shows the retaining ring pressing the inner receptacle being pressed against the profiled top on the inside.
[0043] Figure 10 shows a wedge projecting down from the lid of the container to press the inner receptacle against a roughly profiled top of the container and the dip on the outside into which the inner receptacle is pressed.
[0044] Figure 11 shows a variation of figure 10 in which the profiling of the top against which the inner receptacle is pressed includes spikes and raised knobs, and the wedge attached to the lid is shaped to press the inner receptacle against the profiled bin top.
Detailed Description of the Preferred Embodiments
[0046] Figure 1 shows a paper sack, which in this embodiment is made of kraft paper 1, slightly opened with gussets 2 visible. Where the gusset is located creates four layers of single or multi-ply paper 4 next to each other when the paper sack is closed.
[0047] Figure 2 shows a paper sack in plan view from the side before it is opened out. The hatched lines 3 indicate where, before leaving the factory, the sack is cropped through four layers of one or more ply paper as shown in Figure 1.
[0048] Figure 3 shows a partially opened paper sack 1 with gussets 2 visible and perforations 5 cut into the top 6 of the sack to facilitate neat and correctly positioned tears in the top of the sack so that the top of the sack can be folded outwards for attachment to suspension means at the top of the outer receptacle.
[0049] Figure 4 shows the paper sack 1 fully opened in plan view from above with the top of the sack opened out to the bottom of the four now torn apart perforations 7.
[0050] Figure 5 shows a container 8 in wheeled bin format in plan view from above with its inwardly extending spacers 9, the purpose of which are to provide support for the inner receptacle which in this embodiment is a kraft paper sack, not shown. The outer receptacle is shown with two walls which bow outwards 10 to ensure that there is enough material at the top of the paper sack with its parallel sides to fold outwards for attachment to suspension means without tearing or cutting the sack. This embodiment shows the side of the container which comes into contact with the hydraulic lifting gear of a collection vehicle 11 and the side on which hinges for the lid are located 12 not bowed.
[0051] Figure 5 also shows in the side of the container 11 which comes into contact with the hydraulic lifting gear attached to the collection vehicle an increased number and therefore area of spacers 9 which will come into contact with the outside face of the paper sack.
[0052] Figure 6 shows a container in wheeled bin format 8 in which the lid 13 is hingedly attached to the same axis 14 as the retaining ring 15 shown most clearly represented with hatched lines in the open position. This embodiment also shows the top of the container 16 where the suspension means illustrated in figures 7 to 12 inclusive are to be provided. The side walls 17, base of the container 18, vents 19 and spacers 20 are also shown.
[0053] Figure 7 shows the top of the container 16 with the top section of the side wall 17, an inwardly extending spacer 9 against which is shown the side wall of the paper sack 21 which curves over the top 16 of the container. The retaining ring 15 presses the paper sack 21 against a steeply angled 22 profiled retaining section of the top 16. A section of the container lid 13 is also shown in the closed position.
[0054] Figure 8 is exactly the same as Figure 7 except for the fact that the angled profiled retaining section 22 is at a less acute angle.
[0055] Figure 9 is the same as Figure 8 except that the direction in which the angled profiled retaining section 22 faces is reversed, so that the retaining ring 15 is instead pressing the top of the inner receptacle outwards from the centre of the outer container instead of inwards.
[0056] Figure 10 shows a wedge 23 projecting vertically down from the nearly closed container lid 13. The profiled retaining section face 24 against which the wedge 23 presses the paper sack 21 of this embodiment is also aligned vertically, but it is designed to incorporate appropriate numbers or amounts of spikes, rough textured finishes and protuberances depending on the specification of the paper sack or any other inner container. The rough texture, protuberances and spikes are shown continuing round the top of the retaining section to the reverse side 25 where the paper sack 21 still retains contact with the retaining section. A further feature of this embodiment is the narrow channel 26 into which the paper sack 21 is forced by the wedge 23.
[0057] Figure 11 is an embodiment which retains all the features of Figure 10, but in addition incorporates a row of spikes 27 on the top of the retaining section. In addition to pressing the paper sack 21 of this embodiment against the profiled retaining section face 24, the wedge has a hollow section 28 to enable the paper sack to be pressed down on the spikes 27 or protuberances on top of the profiled retaining section.
[0058] Figure 12 shows the top of the container 16 in which a self-release clip 29 has clamped down on the paper sack 21 of this embodiment. The self-release clip projects 30 inwardly into the container and pivots on a hinge 31. This embodiment shows a projection 32 in the container lid 13 which presses down on the self-release clip with the action of closing the lid. Corrugated or other textured profiling 33 aids in keeping the paper sack in place when the lid 13 is opened. The clip is loosely mounted on the hinge such when the container is inverted (as it would be for example if emptied into a standard waste collection vehicle), the clip disengages to release the inner bag.
1. A container comprising an outer receptacle and an inner receptacle, the inner receptacle
being in the form of a gas permeable bag; characterised in that the gas permeable bag is provided at its upper edge with means defining flaps for
securing the bag to the outer receptacle.
2. A container according to claim 1 wherein the flaps are configured so as to be capable
of being folded back over the upper edge of the outer receptacle.
3. A container according to claim 1 or claim 2 wherein the means defining the flaps take
the form of (i) one or more slits or cuts in the upper edge of the bag; or one or
more lines of weakness at the upper edge of the bag.
4. A container according to claim 3 wherein the or each line of weakness is defined by
a score-line, perforations, or skip cuts.
5. A container according to claim 3 wherein the gas permeable bag is a gussetted bag
folded to provide corners at its upper edge, the corners being cut to provide the
flaps.
6. A container according to any one of the preceding claims wherein the gas permeable
bag is formed from a paper, such as kraft paper.
7. A container comprising an outer receptacle having an opening at an upper end thereof,
and an inner receptacle, the inner receptacle being in the form of a gas permeable
bag, the outer receptacle having holding means for holding the inner receptacle; the
holding means comprising a frame member hingedly linked to the outer receptacle, the
frame member bordering (in a continuous or discontinuous manner) the opening and being
configured to removably clamp the gas permeable bag against the outer receptacle.;
characterised in that the outer receptacle has at its upper edge an inclined surface, the frame member and inclined surface in use co-operating to clamp the gas permeable bag.
characterised in that the outer receptacle has at its upper edge an inclined surface, the frame member and inclined surface in use co-operating to clamp the gas permeable bag.
8. A container according to claim 9 wherein the inclined surface is inclined at an angle
of between 2° and 88° (for example from 5° to 80°) relative to the horizontal.
9. A container according to claim 9 or claim10 wherein the gas permeable bag is: (i)
formed from a paper (e.g. a kraft paper) and the inclined surface is arranged at an
angle of less than 45°relative to the horizontal (for example less than 40°); or (ii)
formed from a plastics material and the inclined surface is arranged at an angle of
greater than 45°relative to the horizontal (for example greater than 60°).
10. A container comprising an outer receptacle having an opening at an upper end thereof,
and an inner receptacle, the inner receptacle being in the form of a gas permeable
bag, the outer receptacle having holding means for holding the inner receptacle against
displacement into the outer receptacle; characterised in that the holding means comprises a gripping surface on an upper edge of the outer receptacle,
the gripping surface having gripping projections for gripping the gas permeable bag
to hold it in place.
11. A container according to claim 13 wherein a gripping surface is provided on
(i) both inner and outer surfaces of the upper edge of the outer container; or
(ii) an outer surface of the upper edge of the outer container.
12. A container according to claim 10 or claim 11 wherein the gripping surface comprises
(i) an array of one or more spike-like projections; or (ii) an array of one or more
laterally extending ridges or ribs (for example sharp edged ridges or ribs).
13. A container according to any one of claims 10 to 12 wherein the gas permeable bag
is formed from a mouldable deformable material, such as a kraft paper.
14. A container according to any one of claims 10 to 13 having a lid hingedly connected
to the outer receptacle, the lid when closed co-operating with the gripping surface
to clamp the gas permeable bag.
15. A container according to claim 14 wherein the lid is provided with a downwardly projecting
clamping member which co-operates with the gripping surface to clamp the gas permeable
bag.
16. A container comprising an outer receptacle having an opening at an upper end thereof,
and an inner receptacle, the inner receptacle being in the form of a gas permeable
bag, the outer receptacle having holding means for holding the inner receptacle against
displacement into the outer receptacle; characterised in that the holding means comprises a lid having a downwardly protruding clamping member
that co-operates with a surface of the outer receptacle to clamp the gas permeable
bag therebetween.
17. A container according to claim 16 wherein the said surface of the outer receptacle
is recessed, the clamping member on the lid serving to trap the gas permeable bag
within the recess.
18. A container comprising an outer receptacle having an opening at an upper end thereof,
and an inner receptacle, the inner receptacle being in the form of a gas permeable
bag, the outer receptacle having holding means for holding the inner receptacle against
displacement into the outer receptacle; characterised in that the holding means comprises one or more releasable clips disposed at the upper edge
of the outer receptacle for gripping the gas permeable bag.
19. A container according to claim 18 having a lid hingedly secured thereto, wherein the
releasable clips are held in a gripping conformation when the lid is in a closed position,
and are releasable when the lid is in an open position.
20. A container comprising an outer receptacle and an inner receptacle, the inner receptacle
being in the form of a gas permeable bag; characterised in that the outer receptacle is provided with one or more sides that are outwardly convex
in plan.
21. A container according to claim 20 wherein the outer receptacle has four sides, at
least one of which (for example two, three or four) is outwardly convex in plan, for
example wherein the or each convex side is arcuate in plan.
22. A container comprising an outer receptacle and an inner receptacle, the inner receptacle
being in the form of a gas permeable bag, the outer receptacle having a plurality
of spacers extending inwardly from an inner surface thereof, and optionally a plurality
of vents in a side wall and/or base thereof, the spacers serving to support the inner
receptacle such that it is spaced apart from the inner surface of the outer receptacle,
and the vents (when present) serving to allow air to circulate between the inner receptacle
and the outer receptacle; characterised in that the innermost edges of the spacers define a proportionately larger area on one side
wall of the outer receptacle than on at least one other of side wall of the outer
receptacle.
23. A container according to claim 22 wherein the area defined by the spacers on one side
wall is greater than the individual areas defined by the spacers on each other side
wall.
24. A container defining an outer receptacle, the container being configured to hold therein
an inner receptacle in the form of a gas permeable bag, the outer receptacle having
a plurality of spacers extending inwardly from an inner surface thereof, and a plurality
of vents in the side walls and/or the base of the outer receptacle, the spacers serving
to support the inner bag such that it is spaced apart from the inner surface of the
outer receptacle, and the vents serving to allow air to circulate between the bag
and the outer receptacle; characterised in that:
(a) the gas permeable bag takes the shape of a paper sack in which at least one of the top corners has been cropped to enable the sides of the sack to open out beyond the designed perimeter of the top of the sack before it is cropped; and/or
(b) the gas permeable bag takes the form of a paper sack in which at least one perforation has been formed in the top of the paper sack; and/or
(c) the outer container has at least one outwardly curved side wall as viewed from above the container; and/or
(d) a retaining ring hingedly attached on the same axis as the container lid is provided as suspension means for the inner receptacle; and/or
(e) a wedge is incorporated into the lid of the container to press the inner receptacle against the profiled top - incorporating where appropriate a rough surface, spikes or other protuberances - of the container to provide suspension means; and/or
(f) at least one clip which will self release when the outer receptacle is at least partly inverted is built into the top of the outer container to provide suspension means; and/or
(g) the inner receptacle is provided with a raised level of support from inwardly extending spacers in one side wall of the outer receptacle.
25. A container as defined in any one of the preceding claims wherein the outer receptacle
has a plurality of spacers extending inwardly from an inner surface thereof, and a
plurality of vents in a side wall and/or base thereof, the spacers serving to support
the inner receptacle such that it is spaced apart from the inner surface of the outer
receptacle, and the vents serving to allow air to circulate between the inner receptacle
and the outer receptacle.
26. An outer receptacle as defined in any one of the preceding claims.
27. A gas permeable bag having means defining flaps for securing the bag to an outer receptacle,
as defined in any one of claims 1 to 6.