Improvements in and Connected with Pneumatic Separators.
Year: 1889

page_text: Date of Application, 22nd June, 1889-Accepted, 7th Sept., 1889
COMPLETE SPECIFICATION.
Improvements in and Connected with Pneumatic Separators.
JAMES HARRISON CARTER 82 Mark Lane London Engineer do hereby declare the
nature of this invention and in what manner the same is to be performed, to he
particularly described and ascertained in and by the following statement :-
Whereas disintegrators have been made to regulate the degrees of fineness of their
grinding by the floating away of the finer products into a settling chamber as described
in my patent No. 1817 15 May 1875 yet it has always been difficult to arrange for
securing impalpable powder free from any admixture of palpable particles; or again
of securing a granular material of a certain degree of fineness only & arranging for
all the particles larger than the desired sample to return automatically to the dis-
integrator beater chamber for further reduction. My present Invention successfully
gives me these desired results in the following way :- construct above the disinte-
grator A, a trunk B leading into settling chamber C. This trunk B is made on the
side nearest the settling chamber of separate boards or iron partitions D, D, D, of any
convenient width, and the fineness of the disintegrated matter is partly secured by
making this partition higher or lower at will by removing or adding some of the
partition. The air escapes from the settling chamber at the end farthest from the
disintegrator by means of a trunk E, which conveys it back again to the inlet of
the disintegrator. The trunk E is lengthened at top & communicates with a dust
Balloon F made of a porous flannel substance. This Balloon allows any excess of
air that may enter with the feed to escape and yet retains the dust which can be
collected at the bottom of the balloon. The chamber is made parallel as regards its
sides; but increasing gradually in height towards the end farthest from disintegrator ;
so that the dust laden air is continually expanding as it travels on towards the return
air trunk, & in this way deposits only the lightest or impalpable powder at the
farthest end. The difficulty of collecting this impalpable powder & returning the
coarse to the disintegrator; is overcome by my design of a double scraping arrange-
ment G. H. with numbers of narrow slides J between them. The top scraping
arrangement G travels toward the end of the chamber, and the bottom set H travels
towards the disintegrator, & by pulling out any one of the slides J, the portion of dis-
integrated material which falls, or settles in the chamber between any drawn out slide,
& the disintegrator end of chamber, returns again to the disintegrator by spout K,
while only the portion of the desired fineness which settles beyond the drawn out slide
goes away down spout L as finished product. The chain of the top scraping arrange-
ment G travels in a little recess at sides of the chamber, so that no granular material
may settle on & be carried out & become mixed with the impalpable powder when
such is not desired. The scrapers which are fixed across between the chains, are
made sharp edged at the top for the same purpose. If it is desired to make more
than one (several) sample of varying fineness at the same operation, slides are put
under the bottom scraper & pulled out at such distances apart as to give the desired
result, the material falling through slide going into another set of scrapers or into a
worin & only such portion of the material as is too coarse going back to the disinte-
grator. Worm, or screw conveyors might be used instead of the double scrapers;
but this would necessitate hoppering the bottom of the settling chamber, & would
cause increasing, or unequal currents of air; & give an imperfect result.
What Lalaim is-

page_text: 2nd. A combination of this double scraper with disintegrator such as is described in
my Patent No. 1817 15 May 1875 or of similar disintegrators; to produce a disin-
tegrated sample of impalpable powder, or of any other desired degree of fineness.
Dated this 22nd day of June 1889.
JAMES HARRISON CARTER.