IMPROVEMENTS IN STEAM-PRESSES FOR PRESSING BROWN COAL AND THE LIKE SUBSTANCES
Year: 1879

page_text: PROVISIONAL SPECIFICATION left by Frank Wirth at the Office of the
Commissioners of Patents on the 25th January 1879. A communication from
Julius Tittelbach, Civil Engineer, of Meissen, in the Empire of Germany.
FRANK WIRTH, of the Firm of Wirth and Company, Patent Solicitors, at Frank-
fort-on-the-Main, in the Empire of Germany. "IMPROVEMENTS IN STEAM-PRESSES
FOR PRESSING BROWN COAL AND THE LIKE SUBSTANCES." A communication from
Julius Tittelbach, Civil Engineer, of Meissen, in the Empire of Germany.
This Invention consists of an improved steam-press for pressing earthy or brown
coal-dust, loose peat, and the like into firm blocks suitable for burning purposes.
The said press consists chiefly of the following principal parts, namely, a large
steam-cylinder containing a piston provided with a double piston rod at each side,
which rods are connected with moulds, and a small steam-distributing cylinder
attached to the left upper side of the said large steam cylinder, which moves the
moulds backward and forward, thus effecting the filling and emptying of the
same.
The chief operations of the machine are as follows, that is to say :-
(1.) Filling the moulds.
(2.) Pressing the material.
(3.) The ejection of the finished cake.
There are also the following operations, namely, the regulating of the machine
and the self acting reversing of the same in its several operations, all effected by
the distributing cylinder.
The regulator, or in reality moderator, a cylinder filled with water, is attached to
the opposite side to the said distributing cylinder on the top of the aforesaid chief
or large cylinder. The reversing motion, consisting of a rolling weight, is located
on one side of the cylinder.
For filling the moulds the stroke of the piston of the distributing cylinder is
transmitted by lever rods to the said moulds, moving the same backwards and
forwards. By this motion a small receiver which holds as much material as is to
form each cake, is passed under a funnel and over a space formed by two stamps.
At each stroke one fills the mould from the funnel, while the other removes the
material between the stamps. After each stroke the moulds stand still until the
reversion of the cylinder. Shortly before the end of the stroke a roll situated on
a rod connecting the piston rods of the two small cylinders enters a lever fork and
admits the steam into the said large cylinder.

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In order to make cakes of small dust, a great pressure is necessary, equalling
about 500 kilogrammes per ☐ centimeter; this is effected in the said machine
which has stamps 120. x 120m/m = 14400 ☐ / by means of a steam piston
1400mm in diameter, working with-a-steam-pressure of 5 atmospheres. The stroke
of the pressing piston is only as much as the extent to which the loose material can
be compressed, in this case 36/m. The pressing is effected from outside towards the
body of the machine, two piston rods-being connected with-a cross-head carrying
one of the aforesaid stamps, the other stamp being carried by the cylinder cover.
After the pressing has been finished the coke remains in the-mould, and is liberated
as follows, that is to say -
By the great pressure the cakes acquire great clasticity, so much so that almost
as much force would be required to push them out of the mould as has been
required to make them. This to be effected by the large steam cylinder would
require too much steam; it is therefore effected by other means, that is to say, by
the elasticity of the cake itself. It was found in working with the first machine
that not only had the sides of the mould to be separated from the cake, but the
aforesaid stamps had to be withdrawn from the same. These three movements have
to be effected while the mould is stationary, and are produced by means of forms
or pieces provided for the purpose, the reversing of a distributing valve, and by
the movement of a stamp wedge.