An Improved Coffee Extractor.
Year: 1891

page_text: Date of Application, 26th Oct., 1391-Accepted, 16th Apr., 1892
COMPLETE SPECIFICATION.
An Improved Coffee Extractor.
I, HERMINE V KÖCKRITZ née Huhndorff of Obernigk in the Empire of
Germany Gentlemen, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement :—
The object of my present invention is to provide an apparatus for extracting the
coffee essence from the bean without adding any other foreign substance, so that n
perfectly pure coffee extract is obtained.
I have further found that in making coffee extract with my improved apparatus
the tannic acid is entirely extracted, thus leaving coffee with a very pure aroma.
The coffee extract will keep a long time in bottles and is in very convenient form
for use, as it is only necessary to pour hot water on to a small quantity of the
extract in order to produce the required quantity of the beverage. The strength
of the coffee made can also be varied according to taste. The coffee extract is
cheaper for household use whilst the coffee prepared from this extract has a very
fine, mild taste, as all the acid substances have been eliminated.
My device consists mainly of a boiler provided with two or more pressure
chambers into which the ground coffee is placed, a refrigerating coil into which the
extract passes, from the boiler, and a second boiler, the said apparatuses being
arranged as hereinafter more particularly described.
In order to make this Specification more easily intelligible I refer to the accom-
panying drawing in which similar letters denote similar parts throughout the
several views:
Fig. 1 is a vertical section and
Fig. 2 a transverse section of my improved apparatus.
The boiler a is provided with two or more pressure vessels bb, having at the
bottom the cross bars c c supporting sieves d d. The cover of the vessel is secured
to the latter by means of belts and thumb nuts or other suitable arrangement,
and a screw spindle f is arranged in the same having hand wheel g. A piston
or pressure plate e is arranged in the vessel which is operated by the said
spindle f.
The above described pressure vessels are arranged on the boiler with their lower
ends in same.
The boiler, which can be bricked in in the ordinary manner, is pro-
vided with safety valve or device i and gauge glass at h by means of which the water
level as also the colour of the liquid therein may be observed. After the cover
and with it pressure plate e have been removed ground coffee is placed in the
vessel; the cover then replaced and the pressure plate screwed down onto the
coffee. The boiler is then filled with water to an appropriate height and the water
brought to the boiling point and thus the coffee essence extracted by means of the
waves produced by the said boiling. During the boiling the coffee should be
continually pressed by turning the hand wheel g. The liquid when it has attained
the proper strength is passed to the refrigerator m to which the boiler a is
connected by means of an appropriate pipe service having stop cock k. The
refrigerator consists preferably of the receptacle m which is either filled with ice
or running water and in which the coil Z is arranged. The extract is here cooled
down and passes out by way of cock n along a suitable pipe system to the lower
boiler o where it is again brought to boiling point and whence it may be finally
drawn off by means of the cock p.
As little air as possible should be allowed to reach the extract during the boiling
and cooling processes and for this reason the boilers are provided with safety
devices ig to prevent the possibility of a vacuum being formed therein.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and the manner of performing the same, what I claim is :
1. The combination of the boiler a having gauge glass and safety devices also
pressure vessels b with sieves c mounted therein and pressure plates e, the
refrigerating coil in the receptacle m and the second boiler o having cock and
safety device 9 the said apparatus being connected by suitable pipe systems
provided with stop cocks substantially as described.
2. The arrangement and construction of the apparatus substantially as herein-
before described and illustrated in the accompanying drawings.
SO 1001
HORN & SON,
Applicant's Agents.