Brewing device for a household expresso coffee machine

Details Brewing device for a household expresso coffee machine Brewing device for a household expresso coffee machine

1994-09-27

1996-06-18

Jenkins, Robert W.

Foods and beverages: apparatus

Beverage

Infusors

99289R, 99302P, A47J 3124

Patent

active

055267335

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a brewing device for a household espresso coffee machine including a piston, vertically slidable in a housing part, and a filter basket to be filled with ground coffee which is retained in a horizontally movable filter basket holder and which, when the piston is lowered and reaches into the filter basket (working position), forms with it a pressure chamber in which the ground coffee is enclosed, and into which, on the piston side, hot water under pressure is urged through a conduit, and from which, on the filter basket holder side, the prepared espresso coffee beverage is discharged through at least one outlet opening.
An espresso coffee machine including an electrically operated water heater is known, from which the heated water is supplied under pressure to a filter basket holder to be filled with ground coffee (DE 34 00 567 C2). The filter basket holder is composed of a filter holder with a rigidly mounted handle. A detachable filter to accommodate the ground coffee is inserted into the filter holder. After the filling operation of the filter, the filter holder is moved from below to a bayonet-type lock arrangement of the housing of the espresso coffee machine, is inserted into it and, subsequently, is swivelled into a working position. In doing so, the filter holder with the inserted filter is sealed by frictional connection. This working operation is complicated and sometimes even very time-consuming, since, in particular due to the vision being impeded, the filter holder cannot always be inserted accurately into the bayonet-type lock arrangement.
For instance, if the filter holder is not moved accurately, that is coaxially, below the bayonet-type lock and is not inserted straight into the bayonet-type lock, the filter holder may tilt and, thus, be damaged. Further, it is disadvantageous that the pressure chamber is sealed frontally through the abutment edge formed on the filter and a seal provided in the housing part, which is done in the instance of the filter basket holder being rotated. Due to the resulting great pressing forces, the elastic seal tends to escape the pressure by deforming. Frequently, the result is leakiness at this point of sealing.
Another espresso coffee machine of the type initially referred to is known (EP-0 184 561 A1), wherein the filter holder is guided in ribs of a U-shaped mounting support with a rack-and-pinion drive, in order to so displace the filter from a feed position, which serves to take up the ground coffee in the filter basket, to a working position, which serves to form the pressure chamber and, thus, to inject hot water under pressure on the ground coffee. A device of this type is very complicated and expensive and, therefore, is not particularly well suited for household espresso coffee machines.
Further, the Italian patent 520 753 discloses an espresso coffee machine intended for industrial application, wherein four filter basket holding devices are arranged evenly spread over the periphery and serving to make espresso coffee by virtue of a four-station feed unit. In this arrangement, the filter basket holders are rotated about the central axis of the device, but swinging the filter basket holder out of the housing is not possible. Also, the problem of feeding the filter basket holders does not occur, since they are filled automatically, and not manually, by means of the four-station feed unit.
Still further, DE-34 22 432 A1 discloses a machine for making espresso coffee, in which the piston plunging into the filter basket and forming the actual brewing tip can be swung upwards out of the range of effect of the filter basket holder and laterally about an axis provided in the housing of the espresso coffee machine to facilitate feeding and emptying the filter basket. This form of embodiment is only possible since the device has a skeleton-type design and, as a result, is accessible from the front and from the sides. Swinging the brewing device about a shaft, which is arranged roughly in the centre of the machine, necessitates

REFERENCES:
patent: 1903519 (1933-04-01), Snider
patent: 3266410 (1966-08-01), Novi
patent: 4796521 (1989-01-01), Grossi
patent: 5144886 (1992-09-01), Geiger

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