CA1271925A - Apparatus for preparing hot beverages - Google Patents
Apparatus for preparing hot beveragesInfo
- Publication number
- CA1271925A CA1271925A CA000525956A CA525956A CA1271925A CA 1271925 A CA1271925 A CA 1271925A CA 000525956 A CA000525956 A CA 000525956A CA 525956 A CA525956 A CA 525956A CA 1271925 A CA1271925 A CA 1271925A
- Authority
- CA
- Canada
- Prior art keywords
- cartridge
- pan
- filter
- water
- coacting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D85/00—Containers, packaging elements or packages, specially adapted for particular articles or materials
- B65D85/70—Containers, packaging elements or packages, specially adapted for particular articles or materials for materials not otherwise provided for
- B65D85/804—Disposable containers or packages with contents which are mixed, infused or dissolved in situ, i.e. without having been previously removed from the package
- B65D85/8043—Packages adapted to allow liquid to pass through the contents
- B65D85/8061—Filters
Abstract
Title: An apparatus for preparing hot beverages Abstract An apparatus for making one or more consumption units of a hot beverage, such as coffee, comprising a combination of a filter pan and a disposable filter cartridge with filters of fibrous web material, fitting therein, said pan and cartridge being provided with coacting walls ensuring a water seal between the said portions when the cartridge is being introduced into the pan and water is being infused. The filter pan and the filter cartridge are made of materials having different coefficients of expansion and the portions coacting for sealing purposes are dimensioned in such a manner that, upon insertion of the cartridge, it rests without clamping or loosely in the pan and the water seal is obtained by means of the capillary forces and/or the clamping effect occurring when the hot water is being infused.
Description
~ 7~ ~ 5 Title: An apparatus for preparin~ hot beversges The present invention relates to ~n apparatus for makin~ or preparing one or more consump~ion units of a hot beverage, in particul~r coffee, comprising a combination of a filter pan and a di~po~able filter cartridge wi~h filters of fibrous web material fitting therein, with the filter pan and the filter cartridge being provided with coacting wall6 which ensure a water seal between the said portions when the filter cartridge has been introduced into the filter pan and water i6 bein~ infused.
ln ~ ~imilar apparatus di~closed in U.S. patent 4,550,024 issued oct. 2g, 1985, the filter cartridges and the filter pan are dimensioned in such a manner that the ~eal is obtained by means of the c~pillary forces occurring durin~ the infusion of water in the space between the 6aid coacting wall~, thus achieving that practically all of the water in~used particip~tes in the extraction.
A major drawback of the known apparatus, however, iB that for obtaining the de~ired capillary ef~ect, a very clo~e toleranse Df the cartridge ~nd ~he filter p~n is required. On the other hand, it is also known ~see French patent 1,347,~92 and German Auslegeschrift 1,207,866) to effect the combin~tion , .
~_~ t~
in such a manner that the filter cartridge has to be pushed into the filter pan with some force, however, with the risk of damaging the top filter, as well as of soiling one's fingers upon removal of the cartridge after use.
It is an object of the present invention to remove these drawbacks.
The apparatus is characterized to that end in that the filter pan and the filter cartridge are made of materials having different coefficients of expansion and the portions coacting for sealing purposes are dimensioned in such a manner that, on insertion of the filter cartridge, it rests without clamping or loosely in the cartridge and the water seal is obtained by means of capillary forces and/or clamping occur~ing during the infusion of the hot water owing to the difference in coefficients of expansion.
It is thus achieved that the filter cartridge can have a larger tolerance relative to the filter pan than is the case in the known construction, for either by the capillary effect or by clamping or both, a water seal is obtained between the filter pan and the cartridge. Besides, the cartridge will have a loose position in the filter pan at ambient temperature, so that said pan can be removed without manual contact.
Naturally, it is clear that the disposable filter cartridge should be made of a material having ~'7~
a larger coefficient of expansion than that of the filter pan material. An example of a suitable combination is a filter pan of aluminum and a disposable filter cartridge of polypropylene.
Another solution for the above tolerance problem is that the filter cartridge and the filter pan are conical and that the angle between said conical side walls and the axis of the cartridge is 3-10, preferably 6.
It has been experimentally found that when the angle is too small, there is produced too large a clamping force between the coacting conical walls, so that the removal of the cartridge from the filter pan gives problems.
It has also been found that when the angle between the coacting, conical peripheral walls and the vertical is too large, the cartridge will float when water is being infused, which is .~ result of leakage water penetrating between the two conical walls. This results in a major part of the water not participating in the extraction.
Some embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Fig. la is a part-sectional la-teral view of a first embodimen~ at ambient temperature;
Fig. lb shows the apparatus shown in Fig.l but during u~e, i.e. after hot water has been infu6ed;
Figs. 2a and 2b are vie~ ~imilar to Fig.
1~ and lb, re~pectively snd ~howing a second embodiment of the apparatu~ according to the pre~ent inven~ion;
Fig. 3 i6 a view similar to Figs. 1 and
ln ~ ~imilar apparatus di~closed in U.S. patent 4,550,024 issued oct. 2g, 1985, the filter cartridges and the filter pan are dimensioned in such a manner that the ~eal is obtained by means of the c~pillary forces occurring durin~ the infusion of water in the space between the 6aid coacting wall~, thus achieving that practically all of the water in~used particip~tes in the extraction.
A major drawback of the known apparatus, however, iB that for obtaining the de~ired capillary ef~ect, a very clo~e toleranse Df the cartridge ~nd ~he filter p~n is required. On the other hand, it is also known ~see French patent 1,347,~92 and German Auslegeschrift 1,207,866) to effect the combin~tion , .
~_~ t~
in such a manner that the filter cartridge has to be pushed into the filter pan with some force, however, with the risk of damaging the top filter, as well as of soiling one's fingers upon removal of the cartridge after use.
It is an object of the present invention to remove these drawbacks.
The apparatus is characterized to that end in that the filter pan and the filter cartridge are made of materials having different coefficients of expansion and the portions coacting for sealing purposes are dimensioned in such a manner that, on insertion of the filter cartridge, it rests without clamping or loosely in the cartridge and the water seal is obtained by means of capillary forces and/or clamping occur~ing during the infusion of the hot water owing to the difference in coefficients of expansion.
It is thus achieved that the filter cartridge can have a larger tolerance relative to the filter pan than is the case in the known construction, for either by the capillary effect or by clamping or both, a water seal is obtained between the filter pan and the cartridge. Besides, the cartridge will have a loose position in the filter pan at ambient temperature, so that said pan can be removed without manual contact.
Naturally, it is clear that the disposable filter cartridge should be made of a material having ~'7~
a larger coefficient of expansion than that of the filter pan material. An example of a suitable combination is a filter pan of aluminum and a disposable filter cartridge of polypropylene.
Another solution for the above tolerance problem is that the filter cartridge and the filter pan are conical and that the angle between said conical side walls and the axis of the cartridge is 3-10, preferably 6.
It has been experimentally found that when the angle is too small, there is produced too large a clamping force between the coacting conical walls, so that the removal of the cartridge from the filter pan gives problems.
It has also been found that when the angle between the coacting, conical peripheral walls and the vertical is too large, the cartridge will float when water is being infused, which is .~ result of leakage water penetrating between the two conical walls. This results in a major part of the water not participating in the extraction.
Some embodiments of the present invention will now be described, by way of example, with reference to the accompanying drawings, in which:
Fig. la is a part-sectional la-teral view of a first embodimen~ at ambient temperature;
Fig. lb shows the apparatus shown in Fig.l but during u~e, i.e. after hot water has been infu6ed;
Figs. 2a and 2b are vie~ ~imilar to Fig.
1~ and lb, re~pectively snd ~howing a second embodiment of the apparatu~ according to the pre~ent inven~ion;
Fig. 3 i6 a view similar to Figs. 1 and
2 of a third embodiment Fig. 4 is a cro56-sectional view on the line IV-IV of Fig. 3; and : Figs. 5 and 6 show an embodiment of a coacting filter pan and filter cartridge with, ~ucce~sively, too ~mall an angle between the vertical and the conical : wall~ (Fig. 5), and too large an angle between the conical walls and the vertical (Fig. 6).
In Fig~. la, lb, 2a and 2b, the ssme parts have identical reference numeral~.
A6 6hown in Fig. la, a filter pan 1 partly shown accommodate6 a dispo~able filter cartridge 2.
Since such a filter pan and cartridge are known per ~e (see e.g. u.s. patent no. 4,550,024, mentioned in ~he introduction), these will not be further de~cribed hereinaf~er.
In the combination shown at the ambient temperature in Fig. 1, there i~ a ~ h~ clearance between cartridge and pan, a~ ~hown in the figure, to the effect that the cartridge at smbient emperature ha~ a loo~e, at lea~t non-cl~mping, po~ition in the filter pan.
,f .. ~
, ....
,. ",....
~: ' "~' " . '' Fig. lb shows the situation after the infusion of hot water, so that the pan and cartridge are expanded, on the understanding that as a result of the larger coefficient of expansion of the cartridge, this now rests clampingly in the filter pan.
Fig. 2a shows a combination of cartridge and pan at ambient temperature with a considerably larger clearance being present than in the assembly shown in Fig. la. After infusion of hot water, in the combination shown in Fig. 2a, the situation shown in Fig. 2b will occur, wherein the clearance between ; the coacting walls of the filter pan and the cartridge is substantially reduced. It is true that as a result, there will be no clamping effect, but the clearance between the said walls has become of such a nature that a water seal is obtained through capillary forces.
The embodiment shown in Figs. 3 and 4 shows a filter cartridge 3 received in a filter pan 4, wherein the cartridge does not rest with an upper peripheral edge on the pan, as in the embodiments shown in Figs.
1 and 2, but wherein the cartridge 3 with its inclined side wall 5 (Fig. 3 left hand part) rests on the corre-sponding side wall 6 of pan 4.
; The embodiment shown in Figs. 3 and 4 shows `~ 25 a filter cartridge with a given unroundness: the cartridge has such a position in the filter pan that this is clampingly received in the pan in the places indicated at 7, while in the places indicated at 8, there is provided such a space between the said edges that this produces a capillary seal only after infusion of hot water due to expansion in the above places.
In this manner, leakage will be prevented even in the case of unroundness.
It will be clear that the admissable tolerances of the dimensions of the filter pan and cartridge depend on ~he materials of which the parts in question are made. Naturallyl a great many different combinations are possible: as an example was already mentioned hereinbefore a filter pan of aluminum and a filter cartridge of polypropylene. The combination may also consist of e.g. a filter cartridge of polypropylene (coefficient of expansion 0.0015 mm/mm/C) and a filter pan of polystyrene (coefficient of expansion 0.0008 mm/mm/C) or a filter cartridge of polypropylene or polystyrene and a filter pan of poiycarbonate (coefficient of expansion 0.0007 mm/mm/C).
In the embodiment shown in Figs. 5 and 6, a filter pan 11 shown only partly is provided with a conically bulged portion 12 wherein fits a filter cartridge 13 having a conical peripheral wall 14.
The angle between the conical wall and the vertical is indicated at ~.
~ hen in both cases the filter cartridge is dropped either from a given height into the cavity : ' ~ ' " , `:
~'7~
of the filter pan, or is pressed into it at a given force, this will arrive therein at a given force K
It will be clear that at a smaller angle, the chance of further depression is larger than when angle ~ is larger. This implies that at a smaller angle ~, the force necessary for removal is likewise larger than when angle ~ is larger.
Summarizing the above~ it can be stated that in the first case (Fig. 5), a very large clamping force is produced, which may result in problems on removal of the filter cartridge from the filter pan.
In the second case (Fig. 6), the clamping force will be insufficient to ensure that during the infusion of water, no floating will occur as a result of the penetratlon of water between the two conical walls.
It is observed in this respect that mostly a slight pushing force will be sufficient, although in the latter case the nominal force is insufficient to seal existing high spots between pan and cartridge;
these forces will become sufficiently large when heating takes place during use to ensure a proper sealing;
in cold condition, the nominal force will again be sufficiently small to allow an easy removal of the cartridge.
As already stated earlier, the materials used will be of influence for the filter cartridge or the filter pan.
In Fig~. la, lb, 2a and 2b, the ssme parts have identical reference numeral~.
A6 6hown in Fig. la, a filter pan 1 partly shown accommodate6 a dispo~able filter cartridge 2.
Since such a filter pan and cartridge are known per ~e (see e.g. u.s. patent no. 4,550,024, mentioned in ~he introduction), these will not be further de~cribed hereinaf~er.
In the combination shown at the ambient temperature in Fig. 1, there i~ a ~ h~ clearance between cartridge and pan, a~ ~hown in the figure, to the effect that the cartridge at smbient emperature ha~ a loo~e, at lea~t non-cl~mping, po~ition in the filter pan.
,f .. ~
, ....
,. ",....
~: ' "~' " . '' Fig. lb shows the situation after the infusion of hot water, so that the pan and cartridge are expanded, on the understanding that as a result of the larger coefficient of expansion of the cartridge, this now rests clampingly in the filter pan.
Fig. 2a shows a combination of cartridge and pan at ambient temperature with a considerably larger clearance being present than in the assembly shown in Fig. la. After infusion of hot water, in the combination shown in Fig. 2a, the situation shown in Fig. 2b will occur, wherein the clearance between ; the coacting walls of the filter pan and the cartridge is substantially reduced. It is true that as a result, there will be no clamping effect, but the clearance between the said walls has become of such a nature that a water seal is obtained through capillary forces.
The embodiment shown in Figs. 3 and 4 shows a filter cartridge 3 received in a filter pan 4, wherein the cartridge does not rest with an upper peripheral edge on the pan, as in the embodiments shown in Figs.
1 and 2, but wherein the cartridge 3 with its inclined side wall 5 (Fig. 3 left hand part) rests on the corre-sponding side wall 6 of pan 4.
; The embodiment shown in Figs. 3 and 4 shows `~ 25 a filter cartridge with a given unroundness: the cartridge has such a position in the filter pan that this is clampingly received in the pan in the places indicated at 7, while in the places indicated at 8, there is provided such a space between the said edges that this produces a capillary seal only after infusion of hot water due to expansion in the above places.
In this manner, leakage will be prevented even in the case of unroundness.
It will be clear that the admissable tolerances of the dimensions of the filter pan and cartridge depend on ~he materials of which the parts in question are made. Naturallyl a great many different combinations are possible: as an example was already mentioned hereinbefore a filter pan of aluminum and a filter cartridge of polypropylene. The combination may also consist of e.g. a filter cartridge of polypropylene (coefficient of expansion 0.0015 mm/mm/C) and a filter pan of polystyrene (coefficient of expansion 0.0008 mm/mm/C) or a filter cartridge of polypropylene or polystyrene and a filter pan of poiycarbonate (coefficient of expansion 0.0007 mm/mm/C).
In the embodiment shown in Figs. 5 and 6, a filter pan 11 shown only partly is provided with a conically bulged portion 12 wherein fits a filter cartridge 13 having a conical peripheral wall 14.
The angle between the conical wall and the vertical is indicated at ~.
~ hen in both cases the filter cartridge is dropped either from a given height into the cavity : ' ~ ' " , `:
~'7~
of the filter pan, or is pressed into it at a given force, this will arrive therein at a given force K
It will be clear that at a smaller angle, the chance of further depression is larger than when angle ~ is larger. This implies that at a smaller angle ~, the force necessary for removal is likewise larger than when angle ~ is larger.
Summarizing the above~ it can be stated that in the first case (Fig. 5), a very large clamping force is produced, which may result in problems on removal of the filter cartridge from the filter pan.
In the second case (Fig. 6), the clamping force will be insufficient to ensure that during the infusion of water, no floating will occur as a result of the penetratlon of water between the two conical walls.
It is observed in this respect that mostly a slight pushing force will be sufficient, although in the latter case the nominal force is insufficient to seal existing high spots between pan and cartridge;
these forces will become sufficiently large when heating takes place during use to ensure a proper sealing;
in cold condition, the nominal force will again be sufficiently small to allow an easy removal of the cartridge.
As already stated earlier, the materials used will be of influence for the filter cartridge or the filter pan.
Claims
1. An apparatus for making one or more consumption units of a hot beverage, such as coffee, comprising a combination of a filter pan and a disposable filter cartridge with filters of fibrous web material, fitting therein, said pan and cartridge being provided with coacting walls ensuring a water seal between the said portions when the cartridge is being introduced into the pan and water is being infused, characterized in that the filter pan and the filter cartridge are made of materials having different coefficients of expansion and the portions coacting for sealing purposes are dimensioned in such a manner that, upon insertion of the cartridge, it rests without clamping or loosely in the pan and the water seal is obtained by means of the capillary forces and/or the clamping effect occuring when the hot water is being infused.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8503529A NL8503529A (en) | 1985-12-20 | 1985-12-20 | DEVICE FOR PREPARING HOT DRINKS. |
| NL8503529 | 1985-12-20 | ||
| DE8609418U DE8609418U1 (en) | 1986-04-08 | 1986-04-08 | Device for preparing a warm drink |
| DEG8609418.1 | 1986-04-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1271925A true CA1271925A (en) | 1990-07-24 |
Family
ID=25950808
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000525956A Expired CA1271925A (en) | 1985-12-20 | 1986-12-22 | Apparatus for preparing hot beverages |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0226260A1 (en) |
| AU (1) | AU583442B2 (en) |
| CA (1) | CA1271925A (en) |
| DK (1) | DK618386A (en) |
| NO (1) | NO865208L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2455215C2 (en) * | 2007-03-23 | 2012-07-10 | Нестек С.А. | Vessel for drink ingredients comprising perforated plate for pressure release |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3083101A (en) * | 1959-04-06 | 1963-03-26 | Noury Jean | Refill for filtration coffee-pot |
| FR1347892A (en) * | 1962-11-23 | 1964-01-04 | Coffee filter | |
| GB1064010A (en) * | 1964-04-21 | 1967-04-05 | Miko Pvba | Improvements to packing-filters and device for using such packing-filters |
| DE1207866B (en) * | 1964-05-23 | 1965-12-23 | Bentz & Sohn Melitta | Portion pack for ground flavor carriers, especially coffee |
| BE782645A (en) * | 1972-04-26 | 1972-08-16 | Veken Germaine V D | IMPROVEMENTS TO COFFEE FILTERS OR THE LIKE WITH SINGLE USE. |
| NL8300213A (en) * | 1983-01-20 | 1984-08-16 | Douwe Egberts Tabaksfab | DEVICE FOR PREPARING HOT DRINKS. |
| GB2156662B (en) * | 1984-04-07 | 1987-04-15 | Philip H English | Apparatus for making individual beverage quantities |
-
1986
- 1986-12-18 AU AU66729/86A patent/AU583442B2/en not_active Ceased
- 1986-12-19 DK DK618386A patent/DK618386A/en not_active Application Discontinuation
- 1986-12-19 EP EP86202342A patent/EP0226260A1/en not_active Ceased
- 1986-12-19 NO NO865208A patent/NO865208L/en unknown
- 1986-12-22 CA CA000525956A patent/CA1271925A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2455215C2 (en) * | 2007-03-23 | 2012-07-10 | Нестек С.А. | Vessel for drink ingredients comprising perforated plate for pressure release |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0226260A1 (en) | 1987-06-24 |
| DK618386A (en) | 1987-06-21 |
| AU583442B2 (en) | 1989-04-27 |
| DK618386D0 (en) | 1986-12-19 |
| NO865208L (en) | 1987-06-22 |
| AU6672986A (en) | 1987-06-25 |
| NO865208D0 (en) | 1986-12-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |