IMPROVEMENTS IN APPARATUS OR MACHINES FOR SEPARATING LIGHT AND HEAVY SUBSTANCES, CHIEFLY DESIGNED FOR THE PURIFICATION OF GRIT AND MIDDLINGS to be as follows:-
Year: 1885

page_text: I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake & Co Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of my invention for "IMPROVEMENTS IN APPARATUS OR MACHINES FOR SEPARATING
LIGHT AND HEAVY SUBSTANCES, CHIEFLY DESIGNED FOR THE PURIFICATION OF
GRIT AND MIDDLINGS to be as follows:-
"
This invention relates to apparatus or machines for separating light and heavy
substances, and is more especially designed for the purification of grit and
middlings.
The specification of Letters Patent dated March 19th A.D. 1884, N° 5155 sets
forth, for this purpose, the employment of grooved bara in combination with a
rocking sieve and extending over or across the same, the arrangement being such
that the air and the light particles carried therein pass up between the grooved
bars to a travelling filter-cloth, whilst the heavier particles carried in the air, fall
into the grooves in the said bars and are thereby discharged into conveyors
arranged at the ends of the said grooves,
Now according to my present invention, which embodies a modification of the
apparatus described in the said former specification, I provide one or more series of
inclined channels which are arranged at equal or about equal distances apart, either in
a longitudinal or transverse direction above the surface of the rocking sieve, so as
to obtain an equal distribution of air in the chamber in which the channels are
arranged, the said chamber being closed by a cover at the top. The said inclined
channels are preferably made of sheet metal by bending the same so as to form a

page_text: trough open along the upper side, the edges of the opening being turned down
inside the trough so as to facilitate the entrance of the particles and prevent their
return over the edges.
In the apparatus described in the said former specification the grooves conduct
the heavy particles only to the conveyors or collectors but according to my present
invention, the channels conduct the heavier particles and also the air and lighter
particles proceeding from the rocking sieve to a conveyor or conduit at one or both
ends of the said channels, where the heavy particles are collected, whilst the air,
and any light particles suspended in the same, are caused to pass either through
an endless travelling apron or an ordinary filter cloth, or directly to a fan or
ventilator.

page_text: of Grit and Middlings.
I, WILLIAM ROBERT LAKE, of the firm of Haseltine, Lake, & Co Patent Agents,
Southampton Buildings, London, 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 apparatus or machines for separating light and heavy
substances, and is more especially designed for the purification of grit and
middlings.
The specifications of Letters Patent, dated respectively March 19th A.D. 1884,
N° 5155, 14th July A.D. 1885, N° 8542, and 12th August A.D. 1885, N° 9808, set
forth, for this purpose, the employment of grooved bars in combination with a
rocking sieve and extending over or across the same, the arrangement being such
that the air and the light particles carried thereby pass up between the grooved
bars to a travelling filter-cloth whilst the heavier particles carried by the air, fall
into the grooves in the said bars and are thereby discharged into conveyors
arranged at the ends of the said grooves.
Now according to my present invention, which embodies a modification of the
apparatus described in the said former specifications, I provide one or more series
of inclined troughs which are arranged at equal, or about equal, distances apart,
either in a longitudinal or transverse direction above the surface of the rocking
sieve, so as to obtain an equal distribution of air in the chamber in which the
channels are arranged, the said chamber being closed by a cover at the top. The
said inclined troughs are preferably made of sheet metal by bending the same to
the required form; the said troughs are open along the upper side; the edges of
the troughs being turned down inside the same so as to facilitate the entrance
of the particles and prevent their return over the edges of the troughs.
In the accompanying drawing,
Figure 1 is a transverse section of one form of my improved trough.
Figure 2 is a transverse section of another form thereof.
It will be seen that the trough shown in Figure 1 is U-shaped, while that
shown in Figure 2 is V-shaped, in transverse section, but both of them are turned
down at the edges to form sloping lips or flanges a constituting a kind of funnel-
mouth. They are thus rendered very effective for collecting and carrying away
the particles that drop into them. The said troughs may be of any other suitable
shape in transverse section.
Each trough is connected at its end or ends with a pipe or passage in. which a
partial vacuum is created and maintained, so that there is always a current of air
entering the said troughs from the tops thereof, whereby the particles are drawn
in through the funnel-mouths and carried along the troughs. The draught in each
case may be regulated by a valve or slide at the end of the trough or by more or
less closing or obstructing its funnel-mouth, the general draught over all the
troughs being regulated in the passage with which they communicate.

page_text: In the apparatus described in the said former specifications, the grooved bars
conduct the heavy particles only to the conveyors or collectors, but, according to
my present invention, the troughs or channels conduct the heavier particles and
also the air and lighter particles proceeding from the rocking sieve to a conveyor
or conduit at one or both ends of the said channels, where the heavy particles are
collected, whilst the air, and any light particles suspended in the same, are caused
to pass either through an endless travelling apron or an ordinary filter-cloth, or
directly to a fan or ventilator.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed as communicated to
me by my foreign Correspondent, I wish it understood that I claim :-
First. In an apparatus for the purpose above specified, the employment of
troughs formed of sheet metal and having their edges turned in, substantially as,
and for the purpose, set forth.
Second. The combination, with the said troughs, of a pipe or passage connected
with the said troughs and means for creating and maintaining a partial vacuum
therein, (with or without the regulating valves or slides) all substantially as, and
for the purposes, set forth.
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