Improvements in Machinery for Purifying Middlings and other Materials.
Year: 1893

page_text: Date of Application, 1st Nov., 1893-Accepted, 2nd Dec., 1893
COMPLETE SPECIFICATION.
Improvements in Machinery for Purifying Middlings and other
Materials.
I CARL HAGGENMACHER, of 8 Rudolfsquai, Budapest in the Kingdom of
Hungary, Mill Engineer, 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 machines hitherto employed for purifying middlings which work with a
vibrating or swinging sieve coinbined with an air current, a horizontal or nearly
horizontal sieve is generally used, above which a grid formed of slit ridges is
arranged. The air current, sucked through the sieve passes through the slits of
the grid carrying along the light particles of the stock, which particles fall back
and are deposited in the parts or channels between the slits on account of the
stillness of the air existing above these channels.
For the purpose of removing the light particles that have fallen into the
channels of the grid, said chaunels had to be inclined in their longitudinal sense;
or if they were horizontal the stock on them had to be removed by a mechanical
device, such as brushes, sweepers, conveyors etc.
In all such machines however the particles once fallen in the channels of
the grid were out of the reach of the air current and could no
effected by it.
more be
The present invention has the effect to repeatedly subject to the air current the
particles after they have been lifted up from the sieve by the air current and
already deposited on the ridges, whereby a far more perfect purification of the
stock is attained.
In the accompanying drawing Fig. 1 is a longitudinal section and Fig. 2 a cross
section of a machine fitted with the improvements and Figs. 3, 4 and 5 details of
the improvements on a larger scale.
To the sieve a strong incline is given which has this advantage; that the
layer of stock passing over it is thinner, so that it is more sensible to the
influence of the air current. Above the sieve is placed a series of steps, ledges
or terraces n to which is imparted either separately or jointly with the sieve a
vibrating or swinging motion, and the elements of which consist essentially of
narrow ledges, upon which the material falls in its downward course. These
ledges are horizontal in their longitudinal sense and in their totality arranged
step fashion parallel to the sieve underneath, being inclined in the direction of
the lower end of the sieve, one ledge projecting nearly or entirely over the
other, so that the particles passing across the whole length of the sieve, fall
like cascades over the ledges, whereby, as every one of the little ledges is open
or perforated at its more or less perpendicular back, the particles are at every
ledge acted upon by the air current coming from below so that a repeated and
continual purifying takes place.
Several of these series of terraces may be arranged above each other; in the
accompanying drawings, two of them are shown.
In Fig. 3 a part of such a series of terraces is represented on a larger scale.
The sides and extending downwards to the sieve, serve for conducting the
air current gently and gradually, while the upward prolongation of the sides k
and above the surfaces m and n of the ledges prevents the stock from falling
back.
Figs. 4 and 5 show varied forms of such steps, ledges or terraces, the only
difference consisting in the manner of carrying out the same principle. In
Fig. 4 is shown a sheet of metal bent in the shape of steps the risers of which

page_text: are perforated, while Fig. 5 represents an inclined sheet of metal in which the
steps or ledges and at the same time the air passages are formed by slits in the
sheet of metal which slit out pieces are bent upwards to form ledges.
The rest of the mechanism of the machine as the crank drive, feed roller,
ventilator etc. are known and require no explanation.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is-
In machines for effecting a sorting or purifying of mill stuff or other material-
by means of a sieve and an air current passing through it; the arrangement above
the sieve of one or more series of steps, ledges, or terraces, the surfaces or treads of
which steps are placed over each other, while the risers of such steps are either left
entirely open or perforated to let the air current pass through.
Dated this 1st day of November 1803
R. HADDAN,
Of the Firm of Herbert Haddan & Co.,
18, Buckingham Street, Strand, London, W.C.