Combined Dust Collector and Aspirator.
Year: 1891

page_text: Date of Application, 30th June, 1891-Accepted, 17th Oct., 1891
COMPLETE SPECIFICATION.
Combined Dust Collector and Aspirator.
I, ABRAHAM N. WOLF, of Allentown, in the County of Lehigh, State of
Pennsylvania, United States of America, Inventor, 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:-
My invention relates to an improvement in combined dust collectors and
aspirators and it consists in the combination and arrangement of parts which will
be fully described hereinafter, and particularly referred to in the claims.
The object of my invention is to construct a dust collector in which the fan draws
a current of air through the falling reduced material for the purpose of grading it,
then forces it through a dust collector around to the entrance to the grader, where
it is caught by the suction of the fan and again drawn through the falling material
to the fan, then creating a continuous circuit of air through the grader, fan and dust
collector, which will accomplish fine work at a slow speed.
Fig. 1 is a vertical section of my machine taken on dotted lines na of Fig. 2.
Fig. 2 is a horizontal section of the same taken on the dotted line y of Fig. 1.
Fig. 3 is a plan view of the right hand end of the machine the top and the grain
spout being removed.
Fig. 4 is a vertical section of Fig. 3, taken on the dotted line = 3.
A represents a suitable enclosing case in the upper part of which is placed the
fan B. Formed at one end of the frame is a vertical chamber C, which is provided
with a series of openings D having valves F which act as regulators. As the
reduced grain falls from the spout G it passes down through the aspirator Z over
the inclined space and in falling it is struck by the currents of air which pass
through the openings D.
The aspirator consists of a channel or spout at the bottom of the spout and the
incline H below it, which deflects the air up into the lower end of the said channel
or spout which causes the material to be blown against the inner wall of the said
channel and pass around the upper end of the incline H¹.
These currents of air are caused by the fan forcing the air into the chamber C
and then drawing it through the chamber I in the lower part of which the
hoppers J, L are formed. The air passes from the chamber I through the fan
case and through the passage N to the dust collector (.
From the dust collector it passes to the chamber V a portion of the air being
drawn by the fan through the openings controlled by the valve W from the
chamber V, while the greater part passes onto the chamber C, through the
openings D to the chamber I.
A portion of the air being drawn down from the chamber V through the valve W
and up from the chamber I it will be seen that counteracting currents are produced
which keep the fluffy material in the air until thoroughly cleansed while at the
same time a circulation of air is allowed around through the chamber C, openings D
chamber I, and fan case to the dust collector.
By means of this construction it will be seen that the blast which passes through
the openings D is regulated by the size of the opening controiled by valve W
for the reason that if a large amount of air passes through the said opening a
Unless the opening
5 smaller amount passes through the openings D, and vice versa.
with valve W was provided counteracting currents would not be produced and
hence the fluffy material would not be kept in the air sufficiently long to be
thoroughly cleansed. The air in the chamber I forces the valve open while the
air which is being drawn through the valve tends to close it, and owing to this fact
O the valve will regulate the blast and the force of the counteracting currents.
The

page_text: currents of air cause the fluffy and light stuff to be drawn to the chamber 1 back to
the fan while the good stock drops into the hopper J and the heavy stock is blown
into the hopper L. The stock in the hopper J passes on to the sizing roll while
the stock in the hopper I passes to the grade roll. The dust being drawn directly
from the top of the chamber passes to the fan from which it is discharged through
the passage N into the dust collector (.
As the air enters the top of the dust collector O laden with dust it strikes against
the revolving wings P which are secured to the shaft Q journalled vertically in the
collector and which has the cone R secured thereto. The dust-settles upon this
cone and is guided by it into the-chamber S, from thence it is removed by the arm T
-secured to the shaft Q through the discharge U.
The air freed of its dust passes from the top of the collector O into the chamber V
from thence it returns to the chamber 1, through the opening controlled by the
valve W.
From the above it will be seen that the fan keeps up a constant current of air
through the chamber C, I, the dust collector and the aspirator without allowing a
particle of material of any kind to be lost. The same air is used over and over and
hence no particle of material can possibly escape. A slower rate of speed than
generally employed can be used, and a very fine grade of separation made.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. In a machine of the character described, the combination of a dust collector, a
chamber at one side thercof, a feed spout which deposits the grain into the said
chamber, a vertical channel at the outer side of the chamber I, a chamber V
connecting the upper ends of the said vertical channel and the dust collector, the
fan and its casing, a passage connecting the fan and the dust collector, and an
opening connecting the fan and the chamber V, whereby counter currents are
formed for the purpose described.
2. The combination of the dust collector, the chamber I, the fan case connecting
their ends, the chamber C at one side of and having openings into the chamber
a feed spout emptying into the chamber I, a chamber V connecting the upper ends
of the dust collector and the chamber C, and an opening in the chamber V which
communicates with the interior of the fan case and a valve placed in the opening,
whereby a continuous current and counter currents are produced, substantially as
described.
3. In a machine of the character described, a dust collector having a revolving
beater or arm, a casing A which has an inner and an outer chamber, valved
openings connecting the said chambers, a feed channel in the upper end of the inner
chamber, a fan casing and a fan in the upper end of the inner chamber, a chamber V
connecting the upper ends of the dust collector and the said outer chamber, a
channel connecting the fan casing and the dust collector tangentially, and a valved
opening connecting the said inner chamber and the chamber V, the parts combined
to operate substantially as shown.
Deted this 30th day of June 1891.
ABRAHAM N. WOLF,
By L. W., per F. B.