Improvements in Apparatus for Making Infusions.
Year: 1890

page_text: Date of Application, 7th Mar.. 1890
Complete Specification Left, 5th Dec.. 1890-Accepted, 7th Mar., 1891
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Making Infusions.
I, CHARLES JOHN JONES, of 24, Eastcheap, in the City of London, Builder, do
hereby declare the nature of this invention to be as follows:-
The object of this invention is to construct an apparatus for making infusions
of coffee and other substances in such a manner that the infusion when made
can readily be forced out from the vessel containing the material through a filter
surface.
To effect this a cylindrical vessel is used fitted with a piston which can move
to and fro within it. One or both ends of the cylinder are closed by a readily
removable cover across which is a perforated filter plate and which is also provided
with a draw off cock. Provision is also inade for admitting boiling water under
pressure to the interior of the cylinder between its piston and closed end.
The coffee or substance of which an infusion is to be made is placed upon the
filter surface of the removable end cover of the cylinder.
The cover is then secured to the end of the cylinder and boiling water is caused
to enter the cylinder between the end cover and the piston and the water pressing -
against the piston moves it away from the end.
Afterwards the draw off cock in the cover is opened and the piston is forced by
pressure in the opposite direction and the infusion is thereby forced through the
filter surface and out through the draw off cock.
If both ends are fitted with a readily removable cover each carrying a filter
surface and draw off cock then I form the cylinder with a hollow axis extending
sidewise from it and make this hollow axis to fit over the end of a fixed horizontal
pipe connected to a boiler or vessel containing boiling water.
The end of the pipe and the hollow axis are made to form a tap by which
the boiling water can always pass to whichever end of the cylinder is upper-
most. To effect this I form two passages on opposite sides of the hollow axis and
continue one of these passages to one end of the cylinder and the other to the
other end.
Each passage at its end I cause to open into an annular chamber formed around
the end of the cylinder. Through the side of the annular chamber which is towards
the cover I form numerous fine perforations through which the water can pass to the
cylinder. The perforations are made of small size so that the solid matter of
which an infusion is being made cannot pass through them.
To make tight joints between the covers and the ends of the cylinder I cause the
covers to be pressed against packing rings carried around the exterior of the
annular chambers. To press each cover against its packing ring I preferably use
a. screw screwed through an arm which extends from one side of the cylinder
partly across its end-the end of the screw is made to bear against the centre of
the cover.
When the screw is unscrewed the cover can be drawn away sidewise and the
spent material on its filter surface be shaken off. When a fresh charge of coffee or
material has been placed on to the filter surface and the cover has been slid back
into its place and clamped to the cylinder end-the cylinder is reversed so as to
bring this cover which was at the bottom to the top. Water under pressure
then enters between it and the piston and when the draw off cock on the cover
which is now at the bottom is opened the piston is forced downwards and the infusion
previously contained in the cylinder below the piston is forced out through the
opened cock.
If the cylinder is provided at one end only with a removable cover carrying a

page_text: filter surface then in place of mounting the cylinder so that it can be reversed as
above described the cylinder is fixed and the removable cover at the bottom. When
the cover has had a requisite charge of coffee or material placed onto the top of its
filter surface and has been placed against and locked to the bottom of the cylinder
boiling water under pressure is (by the opening of a cock on the supply pipe)
admitted between the bottom cover and the piston and the piston rises until it is
arrested by suitable stops. Afterwards when the draw off cock on the removable
cover has been opened the piston may be forced downwards by the action of a lever
or in other suitable ways.
Da L 7th of Mauch 1800
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Making Infusions.
Í, CHARLES JOHN JONES, of 24, Eastcheap, in the City of London, Builder, 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 this invention is to construct an apparatus for making infusions of
coffee and other substances in such a manner that the infusion when made, can
readily be forced out from the vessel containing the material through a filter
surface.
To effect this a cylindrical vessel is used fitted with a piston which can move
to and fro within it. One or both ends of the cylinder are closed by a readily
removable cover across which is a perforated filter plate and which is also provided
with a draw off cock. Provision is also made for admitting boiling water under
pressure to the interior-of the-cylinder-between its piston and closed-end.--
"The coffee or substance of which an infusion is to be made is placed upon the
filter surface of the removable end cover of the cylinder.
The cover is then secured to the end of the cylinder and boiling water is
caused to enter the cylinder between- the end cover-and-the-piston and the water
pressing against the piston moves it away from the end.
Afterwards the draw off cock in the cover is opened and the piston is forced by
pressure in the opposite direction and the infusion is thereby forced through the
filter surface and out through the draw off cock.
If both ends are fitted with a readily removable cover each carrying a filter
surface and draw off cock then I form the cylinder with a hollow axis extending
sidewise from it and make this hollow axis to fit over the end of a fixed horizontal
pipe connected to a boiler or vessel containing boiling water.
The end of the pipe and the hollow axis are made to form a tap by which the
boiling water can always pass to whichever end of the cylinder is uppermost. To
effect this I form two passages on opposite sides of the hollow axis and continue
one of these passages to one end of the cylinder and the other to the other end.
Each passage at its end I cause to open into an annular chamber formed around
the end of the cylinder. Through the side of the annular chamber which is towards
the cover form mumerous fine perforations through which the water can pass to
the cylinder. The perforations are made of small size so that the solid matter of
which an infusion is being made cannot pass through them.
To make tight joints between the covers and the ends of the cylinder I cause the
covers to be pressed against packing rings carried around the exterior of the
annular chambers. To press cach cover against its packing ring I preferably
use a screw screwed through an arm which extends from one side of the cylinder
partly across its end-the end of the screw is made to bear against the centre of
the cover.
When the screw is unscrewed the cover can be drawn away sidewise and the

page_text: spent material on its filter surface be shaken off. When a fresh charge of coffee or
material has been placed on to the filter surface and the cover has been slid back
into its place and clamped to the cylinder end-the cylinder is reversed so as
to bring this cover which was at the bottom to the top. Water under pressure
then enters between it and the piston and when the draw off cock on the cover
which is now at the bottom is opened the piston is forced downwards and the
infusion previously contained in the cylinder below the piston is forced out through
the open cock.
If the cylinder is provided at one end only with a removable cover carrying a
filter surface then in place of mounting the cylinder so that it can be reversed as
above described the cylinder is fixed and the removable cover at the bottom.
When the cover has had a requisite charge of coffee or material placed onto the
top of its filter surface and has been placed against and locked to the bottom of
the cylinder boiling water under pressure is (by the opening of a cock on the
supply-pipe) admitted between the bottom cover and the piston and the piston
rises until it is arrested by suitable stops. Afterwards when the draw off cock on
the removable cover has been opened the piston may be forced downwards by the
action of a lever or in other suitable ways.
Figure is a vertical section of reversible apparatus constructed as above
described.
A is the cylindrical vessel fitted at each end with a readily removeable cover B-
the edge of the circumference of each cover is made to rest against an elastic
ring B held in a groove formed around the end flange of the cylinder A. The
cover is pressed against this elastic ring by a screw C screwed through an arm D
which extends from one side of the cylinder. These arms are formed in one piece
with a hollow axis E which is made to extend outwards from the centre of this
side of the cylinder. The hollow axis is made to fit over a conical plug at the
end of a fixed pipe F which leads from the boiler and is held on to it by a ring G
screwed on to its end-a flange on the interior of the ring being made to come
behind a flange which is around the exterior of the pipe. The passage through
the pipe terminates in an opening F through the side of the plug. In two opposite
sides of the hollow axis of the cylinder passages El are formed one end of either
one or other of which can be brought to coincide with the opening F-the other
ends of the passages E¹ are led through the arms D to the two ends of the
cylinder A and there enter annular chambers A' formed around the end flanges
of the cylinder on the inside of the elastic packing rings B'.
Fine perforations are made from this annular chamber through the face of the
flange through which water enters from the boiler-B is a perforated plate fixed
across each end cover B-the perforations may be sufficiently fine to form the
filter surface or a disc of felt or fleecy material may be held over the plate to form
the filter.
B' are taps carried by the removable ends B. A face view of one of these ends is
shewn at Figure 2. I is the piston inside the cylinder A, A' are small flanges on
the inside of the cylinder at its ends to limit the movement of the piston. The
working of the apparatus is as above described.
If the cylinder in place of being reversible is only fitted with a removable cover
at its lower end the passage of water from the boiler to this lower end may be
controlled by an ordinary tap in other respects the construction is the same except
that the piston would be pressed down by the action of a weight or by a lever or in
other suitable ways.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. In apparatus for making infusions the combination of the cylinder, the piston,
the removable end cover or covers each having a filter surface across it and carrying
a draw off tap and the hollow annular ring around the end or ends of the cylinder

page_text: from which water can be admitted through fine perforations to the cylinder from a
boiler.
2. In apparatus for making infusions the combination of the cylinder, the
removable end cover having a filter surface across it and carrying a draw off tap
and the screw or equivalent mechanism carried by an arm fixed to the side of the
cylinder for pressing the cover against the cylinder end.
3. The construction of apparatus for making infusions substantially as herein
before described.