Apparatus for preparing beverages, such as coffee or tea, by ext

Details Apparatus for preparing beverages, such as coffee or tea, by ext Apparatus for preparing beverages, such as coffee or tea, by ext

1992-01-14

1993-03-30

Hornsby, Harvey C.

Foods and beverages: apparatus

Beverage

Infusors

99289R, 99289T, 99287, 99302R, A47J 3132

Patent

active

051973731

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to an apparatus for preparing beverages such as coffee or tea, comprising: said extraction chamber being at least partly permeable, which at least partly permeable bottom of the extraction chamber can be pressed against the filter unit by suitable means, of said reception chamber being at least partly permeable and positioned in contact with the filter unit, which reception chamber at the bottom part thereof comprises a discharge channel for discharging the prepared beverage, chamber to prepare an extract during a predetermined extraction period, the reception chamber, and activating said means for supplying predetermined amounts of hot water and coffee or tea powder in the extraction chamber an extraction period is measured during which the extraction process is completed, after which the pump is activated to suction the prepared extract through the filter paper web.
An apparatus of this type is described in the German patent DE 30 19 347.


BACKGROUND OF THE INVENTION

Designers of beverage vendors, especially apparatuses for preparing coffee or tea by extraction, have long been of two problems for which a variety of solutions has already been offered.
The first problem is to establish a predetermined extraction period during which the extraction process takes place in the extraction chamber and during which preferably no fluid will seep through the filter into the reception chamber, followed by a quick transfer of the ready prepared extract from the extraction chamber through the filter into the reception chamber. During the extraction process the volume of water involved has to be constant to assure a manageable and reproducible extraction process. However, the moment the prepared extract has exactly the required taste and flavour, this extract has to be transferred through the filter into the reception room as quickly as possible to avoid any undesired change in taste or flavour due to a prolonged extraction process.
The second problem is maintaining the coffee or tea particles in motion within the water during the extraction process to obtain a quick, uniform homogeneous extraction. In other words, the second problem is how to achieve an agitation of the mixture of the hot water and the coffee or tea powder in the extraction chamber during the extraction period.
A type of apparatus in which a solution is offered for both problems is the apparatus comprising a piston movable in a cylindrical reception chamber. An apparatus of this type is for instance described in the Dutch patent application 68.06368, in the European patent specification EP 0 179 866 and in the British specification GB 2 178 645.
In this type of prior art apparatus the reception chamber has a cylindrical shape and comprises a piston connected through a piston rod to a crank shaft which can be driven by a motor. During the extraction period the piston is moved upwards so that air will be pressed from the reception chamber through the paper filter web of the filter unit into the extraction chamber, thereby agitating the mixture of hot water and coffee or tea powder. This agitation of the mixture has a beneficial influence on the quality of the prepared extract. Thereafter the piston is used for suctioning the prepared extract through the filter unit into the reception chamber for which purpose the piston will be moved downwards from its highest position, reached during the extraction period. As a result of the underpressure created thereby in the reception chamber, the extract will be suctioned from the extraction chamber through the filter unit into the reception chamber and can be discharged through a discharge channel opening into the reception chamber.
A first disadvantage of this prior art apparatus is its relatively complicated piston mechanism with a lot of rotatable parts, which is difficult to maintain and to clean. In particular, the fit of the piston in the cylindrical reception chamber has to be maintained within certain tolerance limits to guarantee that this prior art apparatu

REFERENCES:
patent: 1376287 (1921-04-01), Meyfarth
patent: 3338153 (1967-08-01), Holstein et al.
patent: 3446137 (1969-05-01), Pryor et al.
patent: 3565641 (1971-02-01), King
patent: 3666558 (1972-05-01), Pryor et al.
patent: 3921665 (1975-11-01), Lebzelter

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