Improvement in Briquette-presses or Machines for the Manufacture of Fuel-blocks or Bricks.
Year: 1893

page_text: Date of Application, 17th Aug., 1893-Accepted, 11th Nov., 1893
COMPLETE SP
ATION.
Improvement in Briquette-presses or Machines for the Manufacture
of Fuel-blocks or Bricks.
We, GOTTFRIED HÜTTEMANN, Mining Captain, of Wiklitz, in Bohemia,
Austria-Hungary, and GUSTAV SPIECKER, Mine-owner, of Bonn, Rhenish Prussia,
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:
In the roller presses hitherto used for the manufacture of egg-shaped fuel blocks,
the outer surface of each roller of a pair is provided with recesses representing each
one half of an egg in shape and section, so that, whenever two such recesses meet,
they jointly form a mould for a complete "egg." Owing to this shape of the
recesses in the several roller-surfaces, there must necessarily remain intermediate
plain portions between the recesses of each roller, as illustrated in Figs. 1 and 2 of
the accompanying drawings. Now in the cause of the manufacture of the blocks,
the material employed in moulding them, besides entering the semi-oval recesses, is
partly deposited also on those intermediate surfaces, and compressed between the
rollers; so that, when the two rollers turn against each other, they are forced
apart and a considerable pressure is necessary to keep them at the required distance,
with the result, that the shafts and bearings of the rollers are subjected to undue
wear. But the main drawback of the arrangement in question is, that it very
materially reduces the pressure which can be utilized for compressing the blocks;
so that these, on leaving the rollers, are not sufficiently compact, and therefore are
apt to crumble to pieces, besides presenting an unsightly appearance.
These inconveniences are removed by the improved roller-press which forms the
subject of this invention and is adapted for the manufacture of blocks or
briquettes" from dust-coal, lignite, peat, ore or other material.
66
In the accompanying drawings:
Fig. 1 shows the surface of an ordinary roller for pressing oval briquettes;
Fig. 2 is a partial section through the surface of two ordinary rollers;
Fig. 3 shows the surface of a roller embodying our invention;
Fig. 4 is a radial section through the surface of such a roller;
Fig. 5 shows a finished block or briquette in cross section, top view and
longitudinal section.
Fig. 6 is a section through a pair of rollers working together.
According to this invention, as shown in Figs. 3 and 4 of the drawings, the
recesses or moulds in the rollers are provided with, or enclosed between, sharp
edges situated in the respective roller surfaces, and the edges of contiguous
recesses immediately join or coincide with each other, so that no space is lost or
superfluous intermediate surfaces formed, the entire surface of each roller being
turned to useful account, and the whole of the available pressure being utilized in
moulding the blocks, while the wear of the shafts and bearings of the rollers
is greatly reduced. The blocks produced by means of rollers constructed in this
manner, if viewed in plan (Fig. 5), present a rectangular shape, while in both
longitudinal and transverse section they may either be egg-shaped (as in Fig. 5)
or assume a rectangular or any other suitable shape. If desired, however, such
blocks may, even in plan, have their sides inclined to each other at other than right
angles, or be made in any other convenient shape.
The main advantages resulting from the employment of press-rollers constructed
in the manner herein described may therefore be briefly stated as follows;-
1. The pressure of the rollers is fully utilized for moulding the briquettes ;

page_text: 2. The whole of the roller surfaces being divided into moulds, the productive
capacity or "yield" of the process is considerably enhanced; and
3. The wear of the roller shafts and bearings is diminished.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is;-
1. A. roller press for the manufacture of briquettes or fuel blocks, having rollers
in which the moulds are provided with sharp edges situated at the surface of the
rollers, in order to utilize the entire surface of the rollers, and economize the
pressure exerted on the same, substantially as described.
2. A pair of moulding rollers having moulds separated from each other by
straight cutting edges, arranged so as to utilize the entire surface for the formation
of moulds, substantially as described.
Dated this 17th day of August 1893.
FAIRFAX & WETTER,
433, Strand, London, Agents.