Improvements in Apparatus for Dispersing Granular or Powdered Substances.
Year: 1893

page_text: Date of Application, 29th Apr., 1893-Accepted, 2nd June, 1893
COMPLETE SPECIFICATION.
Improvements in Apparatus for Dispersing Granular or Powdered
Substances.
I, ALFRED FRIEDEBERG, of 85, Chaussecstrasse, Berlin, N., in the German
Empire, Civil 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 :--
This invention relates to improvements in apparatus for dispersing fine granular,
ground or otherwise reduced materials and is shown in annexed drawing by Figs. 1-7,
in two modifications.
The two apparatus illustrated on annexed drawing are characterized by the
material to be dispersed, being surrounded and received by an exterior feed
receptacle, around which latter a second receptacle is arranged in such a manner,
that a free space is provided which serves as an outlet channel for the material
to be dispersed.
To work the apparatus compressed air, steam, or other blast is employed which
separates the material fed into or collected in the feed receptacle minutely from
the surface thereof.
In Figs. 1-3 of annexed drawing the blast of compressed air, steam, etc., intro-
duced, acts onto the exterior of the material and thus causes an exterior decrease
and engagement of the same by the blast.
In Figs. 4-7 the said blast is introduced into the interior of the feed receptacle
and the material being exposed on the outer circumference is dispersed and
removed at that point owing to the feed receptacle having apertures.
The action of both apparatus will be best understood from the following detailed
description.
The apparatus shown in Figs. 1-3 consists of a hopper A, which is joined by a
cone like conduit B. The lower part C of the latter projects into the receptacle D,
which on one side is furnished with a pipe S and on the opposite side reduced to
form a spout i. The apparatus intended for dispersing ground material.
If ground material is introduced into the receptacle D by the hopper A it will
in its natural position form a cone M from the bottom of the receptacle D to the
top of the hopper B. The receptacle D will not be completely full, i.e. the
material M is caused to be clear of the part C owing to the respective side of
the conduit B projecting into the receptacle D, whereby a free passage for air is
formed, the section of which towards the bottom is reduced by the surface of the
material. If compressed air, steam, etc., is blown into the receptacle, D, through
pipe S, it passes through the channels K and thus touches the surface O of the
material and draws from it through the spout i a quantity of finely dispersed
material. According to the amount of the finely dispersed material M taken away
at O, it will fall through the conduit B. Figs. 1, 2 & 3, show respectively a
longitudinal and a cross section and a plan of the apparatus.
The apparatus, represented in Fig. 4 in vertical section, in Fig. 5 in elevation,
in Fig. 6 in cross section at line X-Y, and Fig. 7 in plan, serves also for the
dispersing of ground material.
The apparatus consists of the outer cylinder which is contracted at c and
connected to an internal cylinder f, g, f, by the upper end a. The inner cylinder f, g,f,
is provided with apertures i formed by bars f, which are separated from each other
by intermediate apertures i. The upper end of the inner cylinder is closed by a
removable cover e which receives the pipe d and the lower end by the bottom g.
For the sake of clearness these bars are shown in the drawing more apart from

page_text: each other than what would be the case in practice; cross rings may also be used
for holding the dust like material.
If ground material is fed into the inner cylinder f, g, f, and compressed air,
steam, etc., through the pipe d, the blast entered disturbes the surface of the material,
disperses and drives the same through the apertures i, out of the contracted end c.
By these apparatus finely ground or finely reduced material of any kind may be
dispersed. If for instance this arrangement of apparatus is employed for coal
dust firing the most minute and uniform dispersement possible will be attained by
the introduction of compressed air or steam as proved in practice.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed I declare that what I
claim, is-
A dispersing apparatus, in which the material to be dispersed is placed in a feed
receptacle with apertures or which exposes the same at its lower end, surrounded
by a receptacle, the said material being exposed to the direct action of air,
steam, etc., in such a manner that the exposed surface thereof is dispersed and
drawn away substantially as set forth.
Dated this 28th day of April 1893.
F. BOSSHARDT & Co.,
4, Corporation Street, Manchester, Agents to Applicant.