Improvements in Machines for Roasting Coffee and the like.
Year: 1892

page_text: Date of Application, 9th Dec., 1892
Complete Specification Left, 6th Sept., 1893-Accepted, 7th Oct., 1893
PROVISIONAL SPECIFICATION.
Improvements in Machines for Roasting Coffee and the like.
I, THEODOR VON GIMBORN of Emmerich in the Kingdom of Prussia, German
Empire, Engineer and Manufacturer, do hereby declare the nature of this invention
to be as follows:-
This invention relates to machines for roasting coffee and the like, in which a
drum adapted to be set in rotation receives the berries to be roasted, and has
provided in it gas burners for roasting the berries by their direct contact with gas
flames.
In these machines the roasting drums have heretofore been made with a perforated
or sieve-like casing to provide for the escape of the vapours and products of com-
bustion and also for the access of air to the berries. This arrangement presents
the inconvenience that the vapour caused by the roasting, the products of combus-
tion and also the hot ashes produced by the burning of the dust adhering to the
berries and of the coatings separating from them in the roasting, pass into the work-
room.
According to the present invention this inconvenience is obviated by making the
drum with an unperforated casing and furnishing its ends or its casing with openings,
some of which, designed for the inlet of air, communicate freely with the atmo-
sphere, whilst the others are set in communication with a chimney or with the
suction channel of a fan for carrying away the vapour and the products of combus-
tion. As the drum has no perforations in its wall, it may be used for producing
glazed beans by the aid of sugar, which is impossible with perforated drums,
inasmuch as the sugar melted by the heat flows out for the most part through the
holes.
The connection of the drum with the chimney is established by a stationary
vapour chamber which communicates with the vapour outlet openings of the drum.
I prefer to arrange agitating vanes on the inside of the drum, to make these
vanes hollow, pierce them with a great number of small holes and let one end
terminate in an intermediate chamber provided in the drum in front of the vapour
box.
Instead of providing for the outlet of the vapour at one end of the drum it may
also take place in the middle part, the vapour box constituting in this instance an
annular space surrounding the said middle part, and being set in communication
through openings in the wall of the drum with the interior of the same or with the
aforesaid hollow vanes. The openings for the admission of the air may be formed
either in the two ends or in the casing of the drum; in the latter case they are
covered with sieve plates or wire gauze. In like manner the openings in the ends of
the drum may be covered with sieves to prevent the berries from falling out.
Dated this 9th day of December 1892.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Machines for Roasting Coffee and the like.
I, THEODOR VON GIMBORN, of Emmerich in the Kingdom of Prussia, Empire
of Germany, 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 :-
My invention relates to machines for roasting coffee and the like, in which a
drum adapted to be set in rotation receives the berries to be roasted, and has
provided in it, gas burners for roasting the berries by direct contact with gas
Hames.
In these machines the roasting drums have heretofore been made with a perforated
or sieve-like casing to provide for the escape of the vapours and products of
combustion and also for the access of air to the berries. This arrangement
presents the inconvenience that the vapour caused by the roasting, the products
of combustion and also the hot ashes produced by the burning of the dust adhering
to the berries and of the coatings separating from them in the roasting, pass into
the work-room.
According to the present invention this inconvenience is obviated by making the
drum with an unperforated casing and furnishing its ends or its casing with openings,
some of which, designed for the inlet of air, communicate freely with the atmo-
sphere, whilst the others are set in communication with a chimney or with the suction
channel of a fan for carrying away the vapour and the products of combustion. As
the drum has no perforations in its wall, it may be used for producing glazed beans
by the aid of sugar, which is impossible with perforated drums, inasmuch as the
sugar melted by the heat flows out for the most part through the holes.
The connection of the drum with the chimney is established by a stationary
vapour chamber which communicates with the vapour outlet openings of the drum.
I prefer to arrange agitating vanes on the inside of the drum, to make these
vanes hollow, pierce them with a great number of small holes and let one end
terminate in an intermediate chamber provided in the drum in front of the vapour
box.
Instead of providing for the outlet of the vapour at one end of the drum it may also
take place in the middle part, the vapour box constituting in this instance an annular
space surrounding the said middle part, and being set in communication through
openings in the wall of the drum with the interior of the same or with the aforesaid
hollow vanes.
The openings for the admission of the air may be formed either in
the two ends or in the casing of the drum, in the latter case they are covered with
sieve plates or wire gauze. In like manner the openings in the ends of the drum
may be covered with sieves to prevent the berries from falling out.
In the accompanying drawing I have represented a preferred form of a machine
for roasting coffee and the like, embodying my invention.
Figure is a vertical longitudinal section through the machine.
Figure 2 represents a left hand end view of the same, and
Figure 3 shows a transverse section through the roasting drum.
The roasting drum H is constructed with a closed casing composed of sheet iron.
The head plates A and B of the drum are provided with openings A¹ and B₁ respec-
tively, suitably arranged around the trunnions H' and H2 on which the head plates are
fixed. The said openings may each consist in an annular slit or in one or more series of
holes. Through the opening or openings A' of head plate A the interior of the drum
is in free communication with the outer air. In face of the opening or openings B¹ of
the head plate B is arranged a stationary box D which is open on the side of the
drum and connected with the casing of the latter by an air-tight joint permitting
the drum to be rotated. At the top, the box D is in communication with a
chimney D or with the suction channel of a fan. Within the drum the opening or

page_text: openings of the head plate A are covered with a perforated wall or sieve E for
preventing the berries from being ejected through the said openings. The
trunnion H2 of the drum E has its bearing in the box D and serves to impart
motion to the drum, for instance by means of a cranked handle fixed on the said
trunnion. The other trunnion H¹ has a flange by means of which it is supported
and guided in a corresponding groove arranged in the frame J. This trunnion is
hollow and through it is passed into the drum, the gas burner C consisting of a tube
provided with numerous small slits. The burner C is fed with gas from the gas
supply N by means of a nozzle M and a large tube L, the latter being open at the
bottom for the free admission of air so that the gas will be properly mixed with air
before reaching the slits of the burner.
F, F are the usual agitating vanes, the object of which is to constantly stir the
berries and to whip the flames of the burners through the moving mass of berries.
These vanes are hollow and pierced with numerous small holes. At one end the
vanes are secured to the head plate A¹ so that the said end is closed by the latter,
whereas at their other open ends they are mounted in corresponding holes of a
partition wall B arranged at some distance from the head plate B within the drum.
Thus the interior of the vanes is in communication with the chamber formed between
the head plate B and the partition wall B2 and, as this chamber is in communi-
cation through the opening or openings B' with the box D, and the chimney
or suction channel D₁. From this arrangement it results, that the vapours and
products of combustion generated in the drum are drawn from the latter through
the interior of the said vanes into the box D and from the latter into the chimney
or suction channel, whereas the outer air is freely admitted through the opening or
openings A' in the head plate A.
In order to assist in the regulating of the heat within the drum, auxiliary holes
for the admission of air, which are to be covered with wire gauze, or little groups
of such holes, may be arranged at suitable places in the drum casing or in the work-
ing door of the latter, as shown by dotted lines in Figure 1, where A2, A² indicate
two groups of such auxiliary holes, of which one is supposed to be arranged in the
door P.
A simpler arrangement consists in constructing the vanes as usual and omitting
the partition wall B2 so that the drum is in direct communication with box Ď
through the opening or openings of head plate B covered in this case with wire
gauze to prevent the berries from escaping.
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:
In machines for roasting coffee and the like in which a revolving drum is arranged
for receiving the berries and has provided in it gas burners for roasting the berries by
their direct contact with the flames, the combination of a closed drum, with open-
ings or a series of openings in the head plates or in the casing of the drum or in
both, some of the said openings or series of openings being in free communication
with the atmosphere for supplying the drum with air, and the other opening or
series of openings in communication with a chimney or the suction channel of a fan,
substantially as and for the purpose described.
Dated this 6th day of September 1893
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C., Agents for the Applicant.