IMPROVEMENTS IN BOLTING OR SEPARATING APPARATUS OR MACHINES FOR USE IN FLOUR-MILLS
Year: 1884

page_text: COMPLETE SPECIFICATION.
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 BOLTING OR SEPARATING APPARATUS OR
MACHINES FOR USE IN FLOUR-MILLS" 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 bolting or separating machines of that class which
comprises an inclined sieve and an elevating mechanism, whereby the material
which has passed over the sieve and escapes from the lower end thereof, is again
elevated and delivered upon the upper end of the sieve, and in which the material
is, at the same time, caused to move gradually across the sieve so that the material
is repeatedly elevated and caused to flow over the inclined sieve in passing through
the machine.
The object of the present Invention is to adapt the machine, partly or wholly,
to the purification of middlings by organizing the machine in such manner that an
air-current can be directed through the inclined sieve, or a portion thereof, and
the Invention comprises the improvements which will be hereinafter fully set
forth.
In the accompanying Drawing
Figure 1 is a vertical cross section of the improved machine.
Figure 2 is an elevation of the tail end of the machine.
Figure 3 is a horizontal section of the machine.
Figure 4 is an end elevation of the feed end of the machine.
Figure 5 is a vertical section of the tail end of the machine.
Figure 6 is a front elevation of the deflecting boards.
Like letters of reference refer to like parts in the several Figures.
A is the enclosing case of the machine secured to a frame A' and constructed in
any suitable or well known manner

page_text: B represents the separating or bolting screen arranged in an inclined position
within the case A and composed of a suitable number of sections b, b¹, b², b³
arranged side by side. The several sections are clothed with bolting cloth of the
proper mesh in accordance with the particular kind of work for which the machine
is designed. Ordinarily the sections are clothed with cloth of increasing coarseness
from the head toward the tail of the machine, the section 6 being covered with the
finest and the section b³ with the coarsest cloth. The screen is preferably so
inclined that the material will flow over the same by gravity.
C represents the meal chamber above the screen B in which the elevating
mechanism D is arranged and which receives the material to be separated or
bolted.
E represents the flour-chamber underneath the screen which receives the fine
material which has been bolted through the inclined screen and which is provided
with suitable conveyors e e¹ and slides e² for drawing off the various grades of the
bolted material as may be desired.
The elevating mechanism consists preferably of pulleys or drums & d¹ and
buckets secured to one or more endless belts or chains f' running around the
pulleys d, d but any other suitable elevator, for instance a bucket reel may be
employed, if preferred. g represents the feed opening through which the material
to be separated or bolted is delivered into the meal-chamber C.
Hrepresents an air chamber arranged above that portion of the inclined screen
through which an air current is required to be passed for purifying the material
which flows over the screen. When a portion only of the screen is required for
purification, the air chamber H is arranged over the coarse portion of the screen.
In the Drawing it is shown as being arranged over the last section 63 of the
screen. In this case that portion of the flour chamber which is located underneath
the chamber H is separated from the rest of the flour by a partition h to confine
the action of 'the air current to the material which passes through the portion of
the screen which is located below the chamber H. But when the entire screen is
required for purification the chamber H extends over the entire screen.
I represents a suction fan, the eye of which is connected by an air spout i with
the chamber H, so as to exhaust the air therefrom. The force of the air current
can be regulated by a slide i¹.
The air chamber H is arranged above the inclined screen between the lower
portion of the elevating mechanism and the screen and consists of an inclined back
plate j extending along the underside of the elevating mechanism and secured to
the end wall of the case A, a top plate depending from the upper edge of the
back plate, and a side plate * extending downwardly and terminating as closely
to the surface of the screen as practicable.
K and K are flexible strips or curtains secured respectively to the plates ; and j,
and resting on the screen or portions of the case in the plane of the screen to
prevent, as much as possible, air from being drawn into the chamber H except
through the screen. represents an opening formed in the end wall of the case A
for the purpose of admitting air to the flour chamber underneath the air
chamber H.
L
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The ends of the screen frame project through openings m m³ formed in the end
wall of the case A. One end of the screen frame rests against a spring n and the
other end of the screen frame is struck by a knocker N, whereby the screen is
jarred and the meshes are kept open.
o represents adjustable deflecting boards pivotted to the upper side of the top
plate of the chamber H, and connected by a shifting bar o' whereby the position
of the deflecting boards e can be regulated. These deflecting boards can be
adjusted so as to turn or deflect the material, as it is discharged from the elevator,
toward or from the head of the machine, thereby accelerating or retarding the
tendency of the material to work toward the tail end of the machine, which
tendency is given to the material by a slight inclination or pitch of the machine
from its head toward its tail end. By inclining the deflecting boards more or less

page_text: toward the head of the machine, the progress of the material toward the tail end
is more or less retarded. The deflecting boards are preferably arranged more
closely together as they approach the tail end of the machine as represented in
Figure 6, thereby retarding the material more and more in the same measure as
the quantity grows less by the removal of the fine material which is bolted out.
If preferred, the machine may be arranged horizontally and the movement of the
material from the head to the tail of the machine may be effected solely by the
deflecting boards o. The material to be bolted or separated is fed into the meal
chamber C, through the feed spout g, or in any other suitable manner.
machine represented in the Drawings being provided with a screen, and air trunk
drawing an air current only through the, coarse portion of the screen, is especially
adapted to the bolting of meal and the purification of middlings at one operation,
or for the dusting and purification of middlings at one operation.
The
The material consisting of middlings, flour, bran and impurities is elevated from
the rounded bottom of the meal chamber C and caused to flow repeatedly over the
inclined screen. In passing over the finer portions of the screen the flour is bolted
through the screen and separated from the middlings, bran and impurities, which
remain in the meal chamber. When the flour has been thoroughly removed the
middlings &c. reach the coarse section b³ of the screen through which the air
current passes in an upward direction. This air current operates to remove the
light impurities, while the purified middlings are bolted through the section 6º of
the screen.
The light impurities are carried off with the air current through the
spout and fan I, and the bran and heavier impurities are tailed off through an
opening formed in the end wall of the casing A near its bottom at the tail end of
the machine. By properly adjusting the deflecting boards the material can be
retained on the coarse section or purifying section of the screen as long as may be
necessary in order to effect the desired purification.
It is obvious that the air current may be directed through the screen by a blast
fan instead of a suction fan, if preferred.
Having now particularly described and ascertained the nature of my said
Invention and in what manner the same is to be performed I declare that what
I claim is
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First. The combination with an inclined screen, of an air trunk and fan whereby
an air current is directed upwardly through the screen, an elevator whereby the
material escaping from the lower end of the screen is returned to its upper end,
and means whereby the material is caused to move laterally across the screen,
substantially as set forth.
Second. The combination with a screen having the proper pitch or inclination to
cause the material to flow over it by gravity, of an air trunk and fan whereby an
air current is directed upwardly through the screen, and an elevator whereby the
material escaping from the lower end of the screen is returned to its upper end,
substantially as set forth.
Third. The combination with an inclined screen, of an elevating mechanism
facing the screen, and an air trunk and fan whereby an air current is caused to
pass upwardly through the screen, substantially as set forth.
Fourth. The combination with an inclined screen, of an elevator whereby the
material escaping from the lower end of the screen is returned to its upper end,
means whereby a lateral motion across the screen is imparted to the material,
deflecting devices whereby the movement of the material across the screen can be
regulated, and an air trunk and fan whereby a current of air is caused to pass
upwardly through the screen, substantially as set forth.
Fifth. The combination with an inclined screen and an elevator whereby the
material escaping from the lower end of the screen is returned to its upper end, of
an air trunk and fan whereby an air current is directed upwardly through a
portion of the screen, substantially as set forth.
Sixth. The combination with a midlings purifier comprising an inclined screen,
an air trunk and fun whereby an air current is directed upwardly through the

page_text: screen, and an elevator whereby the material escaping from the lower end of the
screen is returned to its upper end, of a preliminary bolting apparatus composed of
an inclined screen and an elevator whereby the material escaping from the lower
end of the screen is returned to its upper end substantially as set forth.
Seventh. In a combined bolting and purifying apparatus, the combination with
an inclined screen composed of sections of different degrees of fineness arranged
side by side, of an elevator whereby the material escaping from the lower end of
the screen is returned to its upper end, mechanism whereby an air current is
directed upwardly through the coarse portion of the screen, and means whereby
the material is caused to move laterally across the screen from the fine to the
coarse sections, substantially as set forth.
Eighth. The combination with an inclined screen of an elevator whereby the
material escaping from the lower end of the screen is returned to its upper end, &
casing enclosing the elevator and screen, and an air trunk arranged between the
elevator and screen and adapted to direct an air current upwardly through the
screen, substantially as set forth.
Ninth. The combination with an inclined screen, of an elevator whereby the
material escaping from the lower end of the screen is returned to its upper end, a
casing enclosing the elevator and screen, an air trunk arranged between the
elevator and screen and flexible strips or curtains k k¹ attached to the air trunk
and resting on the screen or casing, substantially as set forth.
Tenth. The combination with an inclined screen, of an elevator whereby the
material escaping from the lower end of the screen is returned to its upper end, a
casing enclosing the elevator and screen, an air trunk arranged between the
elevator and screen, and adjustable deflecting boards attached to the upper end of
the air trunk, substantially as set forth.
Dated this 1st day of Santambor 1901
HASELTINE, LAKE & Co.,
For the Applicant.