WO2002067739A1 - Plunger filter infusion device - Google Patents

Plunger filter infusion device Download PDF

Info

Publication number
WO2002067739A1
WO2002067739A1 PCT/DK2002/000069 DK0200069W WO02067739A1 WO 2002067739 A1 WO2002067739 A1 WO 2002067739A1 DK 0200069 W DK0200069 W DK 0200069W WO 02067739 A1 WO02067739 A1 WO 02067739A1
Authority
WO
WIPO (PCT)
Prior art keywords
bowl
piston
pot
filter
canal
Prior art date
Application number
PCT/DK2002/000069
Other languages
French (fr)
Inventor
Lisbeth Munkager
Anders Sten Wedell
Original Assignee
Mark & Wedell A/S
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mark & Wedell A/S filed Critical Mark & Wedell A/S
Publication of WO2002067739A1 publication Critical patent/WO2002067739A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/44—Parts or details or accessories of beverage-making apparatus
    • A47J31/60—Cleaning devices
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J31/00—Apparatus for making beverages
    • A47J31/18—Apparatus in which ground coffee or tea-leaves are immersed in the hot liquid in the beverage container
    • A47J31/20—Apparatus in which ground coffee or tea-leaves are immersed in the hot liquid in the beverage container having immersible, e.g. rotatable, filters

Definitions

  • the invention relates to a plunge-filter beverage infuser, alsa. named a cafetiere a piston, French press coffee maker and a filter piston infusion appliance, hereinafter called a press filter device, for the preparing, brewing or making e.g. coffee or tea according to the principle where a tasting substance, e.g. instant coffee or tea leaves and a liquid, e.g.
  • a filter piston or filter piston is pressed through the liquid in a movement directed to the bottom of the pot, where the mainly dry remanence becomes included in a space limited by the inner surface of the pot, the filter piston and a loose inserted underpiston or reception bowl arranged at the inner bottom of the pot, said reception bowl preferably being perforated and which in the lower position of the filter piston can be connected mechanically with the piston by means of a rigid, centrally arranged connection element .
  • Such press filter devices are used in private households or in restaurants .
  • DE-PS 3432289 discloses such a press filter device with a detachable reception bowl arranged in the bottom of the pot.
  • Said bowl is made of a heat resistant plastic mate- rial. It is a drawback by this construction that the reception bowl during its pulling up movement and connected to the filter piston is acting as a piston in a vacuum pump, whereby a vacuum is formed between the reception bowl and the bottom of the pot, said vacuum being proportional with the force used for pulling up the filter piston. Thus, this pulling up takes place rather slowly.
  • the press filter device is characterized by a conduit or canal for pressure equalization between the lower side of the reception bowl and the upper side of the remanence deposited on the reception bowl, said canal is preferably arranged through the rigid and cen- trally arranged connection element on the reception bowl .
  • Claim 3 describes in more detail an embodiment corresponding to the device known from DE-PS 3432289 which may be improved by the present invention although the bowl is air tight, so that the vacuum arising below the bowl by the pulling up thereof after the compression of the remanence in the bowl by means of the filter piston, will not need to be equalized only by the taking in of air along the periphery of the bowl or through the tightly compressed remanence, but the equalization will be further promoted by the air flow through the centrally arranged pressure equalization canal.
  • completely tight or imperforated and easily cleanable bowls can be used and their pulling out from the pots will not be more complicated than if the known perforated bowl had been used.
  • Fig. 1 shows the press filter device in a basic form with a hollow center pin on the reception bowl
  • Fig. 2 shows a press filter device according to fig. 1 with an operation rod for engaging and disengaging the filter piston with the connection element on the reception bowl
  • Fig. 3 shows the press filter device according to Fig. 2 but with a part thereof at an enlarged scale showing the connection elements with the pressure equalizing canal and flow direction and route for the equalization which is opposite to the direction of the pressure equalization air.
  • the press filter device is designed as shown on Fig. 1 and consists of a pot 1 of e.g. glas or metal, a filter piston 2 fitting predominantly tightly to the inner surface of the pot and comprising a perforated metal sheet, a filter sheet of e.g. fine mesh metal tissue and provided with a piston rod 3 preferably of metal .
  • This piston rod 3 extends through the lid 4 of the pot 1, said lid being e.g. of plastic and shaped so that it centers the piston rod with respect to the pot, said centering along with the centering of the filter piston controls the movement of the filter piston so that its center axis is kept essen-ti- ally coincident with the longitudinal axis of the pot.
  • a loosely inserted reception bowl 5 is arranged in the pot, said bowl predominantly fitting tightly to the inner cylindrical surface of the pot and manufactured from e.g. perforated metal sheet and provided with at least one con- necting elements 6 each for connection with a connecting element 7 on the filter piston, so that the filter piston and the reception bowl is interconnected when the filter piston by its activation is pushed through the liquid to its lower position in such a way that when the filter piston is pulled out or up from the pot for cleaning after use, also the reception bowl and consequently the remanence trapped between the piston and the bowl will be pulled out.
  • the connecting element 6 may preferably be performed with a throughgoing bore for equalizing the pressure differences between the lower surface of the reception bowl and the upper surface of the remanence in the bowl which pressure equalizing will facilitate the pulling out of the piston and bowl for the cleaning.
  • the connecting elements may, as shown in Fig. 1, comprise a rigid element 6 arranged centrally on the reception bowl and preferably made of metal with a thickening or larger outer diameter in the end facing the filter piston, said filter piston being provided with a flexible element 7 preferably made of metal and shaped so that the connection is established by the flexible element is pressed down over the thickening on the connecting element 6 of the reception bowl according to the same principle as a socalled snap lock, and detaching of the bowl from the filter piston may be done by means of a predominantly sidewise displacement of the bowl relatively to the filter piston after the pulling up or out of the bowl from the pot by means of the filter piston.
  • the connecting elements may comprise a rigid element 9 arranged centrally on the bowl 8, said element preferably being of a cylindrical shape and secured to the surface facing the fil- ter piston 10, said filter piston being provided with a connecting element shaped as a pair of tongues 11 which partly enclose the connecting element 9 arranged on the bowl when the filtration pistion is in its lower position, and which pair of tongues is shaped as a slotted conical insert which fit into the filter piston, said insert via a rod 13 arranged in the hollow piston rod 12 belonging to the filtration piston is connected with a handle 14 so that the pair of tongues 11 by an upward pull in the handle 14 when retaining the handle 15 on the piston rod of the filtration pistion clamp and engage around the connecting element 9 arranged on the bowl, whereby the bowl can be pulled out from the pot along with the filtration pistion.
  • the surfaces on the connecting means 9 on the bowl and the pair of tongues 11 may advantageously be provided with one or more grooves or channels for increasing the pressure equalizing rate and

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Apparatus For Making Beverages (AREA)

Abstract

Press filter device for the preparing, brewing or making e.g. coffee or tea according to the principle where a tasting substance, e.g. instant coffee or tea leaves and a liquid are dosed into a jug or pot (1), followed by a filtration process during which a filter piston (2; 10) is pressed through the liquid in a movement directed to the bottom of the pot, where the mainly dry remanence (waste product) becomes included in a space limited by the inner surface of the pot, the filter piston (2; 10) and a loose inserted underpiston or reception bowl (5; 9) arranged at the inner bottom of the pot, said reception bowl preferably being perforated and which in the lower position of the filter piston can be connected mechanically with the piston (2; 10) by means of a rigid, centrally arranged connection element (6; 9), wherein a canal or conduit is provided through the rigid centrally arranged connecting element (6; 9) on the bowl (5; 8) for equalizing the pressure between the lower side of the bowl (5; 8) and the upper side of the remanence deposited in the bowl, so that the vacuum arising below the bowl by the pulling up thereof after the compression of the remanence in the bowl by means of the filter piston, will not need to be equalized only by the taking in of air along the periphery of the bowl or through the tightly compressed remanence, but the equalization will be further promoted by the air flow through the centrally arranged pressure equalization canal. Thus, completely tight or imperforated and easily cleanable bowls can be used and their pulling out from the pots will not be more complicated than if the known perforated bowl had been used.

Description

PLUNGER FILTER INFUSION DEVICE
The invention relates to a plunge-filter beverage infuser, alsa. named a cafetiere a piston, French press coffee maker and a filter piston infusion appliance, hereinafter called a press filter device, for the preparing, brewing or making e.g. coffee or tea according to the principle where a tasting substance, e.g. instant coffee or tea leaves and a liquid, e.g. hot or boiling water or an alcoholic beverage are dosed into a jug or pot, followed by a filtration process during which a filter piston or filter piston is pressed through the liquid in a movement directed to the bottom of the pot, where the mainly dry remanence becomes included in a space limited by the inner surface of the pot, the filter piston and a loose inserted underpiston or reception bowl arranged at the inner bottom of the pot, said reception bowl preferably being perforated and which in the lower position of the filter piston can be connected mechanically with the piston by means of a rigid, centrally arranged connection element . Such press filter devices are used in private households or in restaurants .
DE-PS 3432289 discloses such a press filter device with a detachable reception bowl arranged in the bottom of the pot. Said bowl is made of a heat resistant plastic mate- rial. It is a drawback by this construction that the reception bowl during its pulling up movement and connected to the filter piston is acting as a piston in a vacuum pump, whereby a vacuum is formed between the reception bowl and the bottom of the pot, said vacuum being proportional with the force used for pulling up the filter piston. Thus, this pulling up takes place rather slowly.
It has been attempted to eliminate the drawback by- said press filter device by the construction known from US-PS 5,979,299 wherein the reception bowl has a perforated bottom and wall with which the filter piston may engage after the filtration operation. At this time the remanence is compressed in the reception bowl and forms a relatively dense filter cake of a cemented substance which during the pulling up of the reception bowl also acts as a piston in a vacuum pump whereby the vacuum will delay and complicate a quick pulling up, even if alle the liquid in the pot has been poured out. The press filter device according to the invention is characterized by a conduit or canal for pressure equalization between the lower side of the reception bowl and the upper side of the remanence deposited on the reception bowl, said canal is preferably arranged through the rigid and cen- trally arranged connection element on the reception bowl . Thus, the above drawbacks are eliminated since a canal for the equalization of the pressure difference conducts air and/or liquid between the lower side of the bowl and the upper side of said filter cake, i.e. the air/liquid avoids getting through the filter cake, so that the pulling up of the filter piston along with the remanence in the bowl can take place with no significant obstruction.
This embodiment will be described in more detail in connection with the measures mentioned in claim 2. Claim 3 describes in more detail an embodiment corresponding to the device known from DE-PS 3432289 which may be improved by the present invention although the bowl is air tight, so that the vacuum arising below the bowl by the pulling up thereof after the compression of the remanence in the bowl by means of the filter piston, will not need to be equalized only by the taking in of air along the periphery of the bowl or through the tightly compressed remanence, but the equalization will be further promoted by the air flow through the centrally arranged pressure equalization canal. Thus, completely tight or imperforated and easily cleanable bowls can be used and their pulling out from the pots will not be more complicated than if the known perforated bowl had been used.
The invention will now be described in more detail with reference to some embodiments. On the drawing:
Fig. 1 shows the press filter device in a basic form with a hollow center pin on the reception bowl, Fig. 2 shows a press filter device according to fig. 1 with an operation rod for engaging and disengaging the filter piston with the connection element on the reception bowl, and Fig. 3 shows the press filter device according to Fig. 2 but with a part thereof at an enlarged scale showing the connection elements with the pressure equalizing canal and flow direction and route for the equalization which is opposite to the direction of the pressure equalization air.
In its basic form the press filter device is designed as shown on Fig. 1 and consists of a pot 1 of e.g. glas or metal, a filter piston 2 fitting predominantly tightly to the inner surface of the pot and comprising a perforated metal sheet, a filter sheet of e.g. fine mesh metal tissue and provided with a piston rod 3 preferably of metal . This piston rod 3 extends through the lid 4 of the pot 1, said lid being e.g. of plastic and shaped so that it centers the piston rod with respect to the pot, said centering along with the centering of the filter piston controls the movement of the filter piston so that its center axis is kept essen-ti- ally coincident with the longitudinal axis of the pot. Furthermore, a loosely inserted reception bowl 5 is arranged in the pot, said bowl predominantly fitting tightly to the inner cylindrical surface of the pot and manufactured from e.g. perforated metal sheet and provided with at least one con- necting elements 6 each for connection with a connecting element 7 on the filter piston, so that the filter piston and the reception bowl is interconnected when the filter piston by its activation is pushed through the liquid to its lower position in such a way that when the filter piston is pulled out or up from the pot for cleaning after use, also the reception bowl and consequently the remanence trapped between the piston and the bowl will be pulled out. The connecting element 6 may preferably be performed with a throughgoing bore for equalizing the pressure differences between the lower surface of the reception bowl and the upper surface of the remanence in the bowl which pressure equalizing will facilitate the pulling out of the piston and bowl for the cleaning.
In its basic shape the connecting elements may, as shown in Fig. 1, comprise a rigid element 6 arranged centrally on the reception bowl and preferably made of metal with a thickening or larger outer diameter in the end facing the filter piston, said filter piston being provided with a flexible element 7 preferably made of metal and shaped so that the connection is established by the flexible element is pressed down over the thickening on the connecting element 6 of the reception bowl according to the same principle as a socalled snap lock, and detaching of the bowl from the filter piston may be done by means of a predominantly sidewise displacement of the bowl relatively to the filter piston after the pulling up or out of the bowl from the pot by means of the filter piston.
In an alternative embodiment shown in Fig. 2 the connecting elements may comprise a rigid element 9 arranged centrally on the bowl 8, said element preferably being of a cylindrical shape and secured to the surface facing the fil- ter piston 10, said filter piston being provided with a connecting element shaped as a pair of tongues 11 which partly enclose the connecting element 9 arranged on the bowl when the filtration pistion is in its lower position, and which pair of tongues is shaped as a slotted conical insert which fit into the filter piston, said insert via a rod 13 arranged in the hollow piston rod 12 belonging to the filtration piston is connected with a handle 14 so that the pair of tongues 11 by an upward pull in the handle 14 when retaining the handle 15 on the piston rod of the filtration pistion clamp and engage around the connecting element 9 arranged on the bowl, whereby the bowl can be pulled out from the pot along with the filtration pistion. The surfaces on the connecting means 9 on the bowl and the pair of tongues 11 may advantageously be provided with one or more grooves or channels for increasing the pressure equalizing rate and the interconnecting engagement between said two connecting elements for pulling out of the piston and the bowl from the pot.

Claims

C l a i m s :
1. Press filter device for the preparing, brewing or making e.g. coffee or tea according to the principle where a tasting substance, e.g. instant coffee or tea leaves and a liquid are dosed into a jug or pot (1), followed by a filtration process during which a filter piston (2; 10) is pressed through the liquid in a movement directed to the bottom of the pot, where the mainly dry remanence (waste product) becomes included in a space limited by the inner surface of the pot, the filter piston (2; 10) and a loose inserted underpiston or reception bowl (5; 9) arranged at the inner bottom of the pot, said reception bowl preferably being perforated and which in the lower position of the filter piston can be connected mechanically with the piston (2; 10) by means of a rigid, centrally arranged connection element (6; 9), c h a r a c t e r i z e d in that a canal or conduit is provided through the rigid centrally arranged connecting element (6; 9) on the bowl (5; 8) for equalizing the pressure between the lower side of the bowl (5; 8) and the upper side of the remanence deposited in the bowl .
2. Device according to claim 1, c h a r a c t e r i z e d in that the pressure equalizing canal of the connecting element (6; 9) has an outlet on the lower side of the bowl ( 5; 8 ) and extends so far up in the connecting element that the upper inlet of the other canal is located higher than the level corresponding to the upper surface of the remanence deposited in the bowl.
3. Device according to claim 1, c h a r a c t e r i z f['e d in that the reception bowl (5; 8) is mainly shaped with smooth surfaces which are only broken by each pressure equalizing canal.
4. Device according to claim 1, 2 and 3, c h a r a c t e r i z e d in that detaching the bowl from the filter piston after it has pulled out the bowl from the pot mainly is done by a displacement of the bowl crosswise or sidewise in relation to the filter piston.
5. Device according to claim 1, 2 or 3, c h a r a c - t e r i z e d in that a rod connection ( 13 ) extends through a hollow piston rod (12) firmly attached to the filter piston (10) for the activation of a pair of tongues into engagement with the rigid centrally secured connecting element ( 9 ) , and that the engagement of the pair of tongues does not obstruct or prevent the pressure equalization through said canal.
6. Device according to claim 1, 2 or 3 and claim 5, c h a r a c t e r i z e d in that the pair of tongues are shaped as a slotted conical insert which fit into the filter piston and allowing the pressure equalization through said canal.
PCT/DK2002/000069 2001-01-30 2002-01-30 Plunger filter infusion device WO2002067739A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DKPA200100149 2001-01-30
DK200100149A DK200100149A (en) 2001-01-30 2001-01-30 coffeemaker

Publications (1)

Publication Number Publication Date
WO2002067739A1 true WO2002067739A1 (en) 2002-09-06

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WO (1) WO2002067739A1 (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7040218B1 (en) 2003-10-15 2006-05-09 Biolchini Jr Robert F Stirring coffee press
US7337705B1 (en) 2007-06-08 2008-03-04 Laura Catena Press and sip device
WO2012025125A2 (en) 2010-08-24 2012-03-01 Stelton A/S Device for making coffee, tea or the like
GB2504684A (en) * 2012-08-04 2014-02-12 Timothy Craven Beverage infuser and substance removing device
EP2798985A1 (en) * 2013-04-29 2014-11-05 FRED ApS Press pot
US20150196158A1 (en) * 2014-01-10 2015-07-16 Jennifer Rose Rivera Velasquez Infusion extracting apparatus and method
GB2534543A (en) * 2014-12-08 2016-08-03 Gort-Barten Alex Cafetiere
US9492027B2 (en) * 2014-01-10 2016-11-15 Made Simpli, Llc Infusion process apparatus and method
DE102015119406A1 (en) * 2015-11-11 2017-05-11 Pi-Design Ag Collecting container for collecting insoluble material, which is used in the preparation of beverages, and Aufgussvorrichtung with such a collecting container
US10448779B2 (en) 2016-02-11 2019-10-22 Alan Paul Kalbfleisch Beverage maker
EP3678519A4 (en) * 2017-09-05 2021-05-05 Spitzley, Julie K. Commercial french press coffee brewing and dispensing system
DE102021123268B3 (en) 2021-09-08 2022-10-06 Pi-Design Ag Device for handling a potable liquid
DE102022109660A1 (en) 2022-04-21 2023-10-26 Pi-Design Ag Filter insert for an infusion device for preparing drinks, in particular coffee or tea, and infusion device with such a filter insert

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3432289C1 (en) * 1984-09-01 1985-10-10 VIDEO-PROMOTION Propaganda- und Warenvertriebsgesellschaft mbH, 4200 Oberhausen Coffee maker
EP0615714A1 (en) * 1993-03-17 1994-09-21 General Foods Limited Apparatus and method for beverage preparation
US5544566A (en) * 1992-05-26 1996-08-13 Bersten; Ian J. Two stage coffee plunger
US5979299A (en) * 1995-05-09 1999-11-09 Hornsby; David J. Beverage infusion making apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3432289C1 (en) * 1984-09-01 1985-10-10 VIDEO-PROMOTION Propaganda- und Warenvertriebsgesellschaft mbH, 4200 Oberhausen Coffee maker
US5544566A (en) * 1992-05-26 1996-08-13 Bersten; Ian J. Two stage coffee plunger
EP0615714A1 (en) * 1993-03-17 1994-09-21 General Foods Limited Apparatus and method for beverage preparation
US5979299A (en) * 1995-05-09 1999-11-09 Hornsby; David J. Beverage infusion making apparatus

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7040218B1 (en) 2003-10-15 2006-05-09 Biolchini Jr Robert F Stirring coffee press
US7337705B1 (en) 2007-06-08 2008-03-04 Laura Catena Press and sip device
WO2012025125A2 (en) 2010-08-24 2012-03-01 Stelton A/S Device for making coffee, tea or the like
WO2012025125A3 (en) * 2010-08-24 2012-04-12 Stelton A/S Device for making coffee, tea or the like
GB2504684A (en) * 2012-08-04 2014-02-12 Timothy Craven Beverage infuser and substance removing device
GB2506503A (en) * 2012-08-04 2014-04-02 Timothy Craven Infusion apparatus and method of use thereof
EP2798985A1 (en) * 2013-04-29 2014-11-05 FRED ApS Press pot
WO2014177573A1 (en) * 2013-04-29 2014-11-06 Fred Aps Press pot
US20170000286A1 (en) * 2014-01-10 2017-01-05 Jennifer Morse Infusion extracting apparatus and method
US9492027B2 (en) * 2014-01-10 2016-11-15 Made Simpli, Llc Infusion process apparatus and method
US9526369B2 (en) * 2014-01-10 2016-12-27 Made Simpli, Llc Infusion extracting apparatus and method
US20150196158A1 (en) * 2014-01-10 2015-07-16 Jennifer Rose Rivera Velasquez Infusion extracting apparatus and method
US10791866B2 (en) * 2014-01-10 2020-10-06 Made Simpli, Llc Infusion extracting apparatus and method
GB2534543A (en) * 2014-12-08 2016-08-03 Gort-Barten Alex Cafetiere
AU2016354347B2 (en) * 2015-11-11 2020-07-09 Pi-Design Ag Collecting container for collecting insoluble material used during the preparation a beverages, and infusion device comprising such a collecting container
CN108348092A (en) * 2015-11-11 2018-07-31 Pi-设计公开股份公司 The collection vessel of the insoluble matter used when preparing beverage for collection and infuser device with this collection vessel
WO2017080885A1 (en) * 2015-11-11 2017-05-18 Pi-Design Ag Collecting container for collecting insoluble material used during the preparation a beverages, and infusion device comprising such a collecting container
DE102015119406A1 (en) * 2015-11-11 2017-05-11 Pi-Design Ag Collecting container for collecting insoluble material, which is used in the preparation of beverages, and Aufgussvorrichtung with such a collecting container
US10820738B2 (en) 2015-11-11 2020-11-03 Pi-Design Ag Collection receptacle for collecting insoluble material that is used for preparing beverages, as well as infusion device with such a collection receptacle
US10448779B2 (en) 2016-02-11 2019-10-22 Alan Paul Kalbfleisch Beverage maker
EP3678519A4 (en) * 2017-09-05 2021-05-05 Spitzley, Julie K. Commercial french press coffee brewing and dispensing system
DE102021123268B3 (en) 2021-09-08 2022-10-06 Pi-Design Ag Device for handling a potable liquid
WO2023036615A1 (en) 2021-09-08 2023-03-16 Pi-Design Ag Device for handling a drinkable liquid
DE102022109660A1 (en) 2022-04-21 2023-10-26 Pi-Design Ag Filter insert for an infusion device for preparing drinks, in particular coffee or tea, and infusion device with such a filter insert
WO2023202979A1 (en) 2022-04-21 2023-10-26 Pi-Design Ag Filter insert for an infusion device for preparing beverages, in particular coffee or tea, and infusion device comprising such a filter insert

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