AN IMPROVED METHOD OF AND MEANS FOR REMOVING BONE-BLACK FROM FILTERS AND FOR CONVEYING BONE-BLACK AND SIMILAR GRANULATED SUBSTANCES
Year: 1882

page_text: LETTERS PATENT to Alexander Melville Clark of the firm of A M and
W Clark of 53 Chancery Lane, in the County of Middlesex, Patent Agents,
for an invention of "AN IMPROVED METHOD OF AND MEANS FOR REMOVING
BONE-BLACK FROM FILTERS AND FOR CONVEYING BONE-BLACK AND SIMILAR
GRANULATED SUBSTANCES." A communication from abroad by John Otto
Donner of the City County and State of New York, United States of
America
COMPLETE SPECIFICATION filed by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 6th September 1882.
ALEXANDER MELVILLE CLARK of the firm of A. M. and W. Clark of 53 Chancery
Lane in the County of Middlesex, Patent Agents. "AN IMPROVED METHOD OF
AND MEANS FOR REMOVING BONE-BLACK FROM FILTERS AND FOR CONVEYING BONE
BLACK AND SIMILAR GRANULATED SUBSTANCES." A communication from abroad by
John Otto Donner of the City County and State of New York, United States of
America.
The object of this Invention is to facilitate the removal of bone black from
filters and the conveying of bone black and similar granular substances from place
to place.
The Invention consists in the method of conveying bone black and similar
granulated substances by forcing water into the vessel containing the substance
and through a pipe connected with the lower part of said vessel and leading to the
desired place. The Invention further consists in the combination with the tank
having a discharge nozzle, a false bottom, and a blanket, of a centre plate having
feet and a centre aperture, and a flanged pipe, whereby the bone black will be
conducted through the false bottom of the tank. The Invention also consists in
the combination with the tank having a discharge nozzle, of a valve and a conveyor
pipe as will be hereinafter fully described.
I will describe the improvement as applied to filters in sugar refineries, but do
not limit myself to that use as it can be used with equal advantages for conveying
various granular substances, as for instance, starch in starch manufactories.

page_text: Figure 1 of the accompanying drawings is a sectional elevation of the lower part
of a filter. Figure 2 is a view of the middle part of Figure 1 enlarged. Figure 3
is a sectional elevation of the lower end of the discharge nozzle showing it closed
by a cap plate. Figure 4 is a bottom view of the same. Figure 5 is a cross
section of the cap plate. Figure 6 is a sectional elevation of the lower end of the
discharge nozzle showing a pipe connected with it. Figure 7 is a bottom view of
the same. Figure 8 is a plan view of the centre plate. Figure 9 is a bottom view
of the same. Figure 10 is a plan view of the filter bottom, the blanket and part
of the slat bottom being removed. The same letters of reference indicate
corresponding parts in all the figures.
A represents the filter tank, the bottom of which inclines upward slightly from
the centre toward the circumference as shown in Figure 1, and is provided at its
centre with a discharge nozzle B having a flange C around its lower end. Upon
the bottom of the tank A is laid a false bottom formed of sixteen, more or less,
radial sections D having channels E Figure 10 between their adjacent edges to
allow the filtered substance to flow to the circumference of the tank bottom and
pass out through the discharge pipe F. The false bottom sections D are connected
at their ends by plates G in groups of four more or less, so that they can be readily
put in and taken out. The sections D between the connecting plates G are
provided with a covering of slats H placed tangentially as shown in Figure 10,
and which are of the same thickness as the said plates G; the slats H are placed at
a little distance apart to form passages for the filtered substance to the passages E.
At the inner ends of the sections D around the opening to the nozzle B is left a
circular space I which is covered by the centre plate J. The outer edge of the
centre plate J rests upon the inner ends of the sections D and the middle part of
the said centre plate has lugs or feet K formed upon the lower side to rest upon
the bottom of the tank A as shown in Figures 1 and 2. The centre plate J is
made of the same thickness as the plates G and slats H, and its upper surface,
except a small circular space at its centre, is corrugated or grooved to form
channels for the filtered substance to flow off. The plates G, slats H, and centre
plate J are covered by a blanket L of wool or other suitable material to prevent
the bone black with which the tank A is filled from getting into and clogging the
channels for the filtered substance. The centre plate J and blanket L have a hole
formed through them corresponding in size with the inner end of the nozzle B and
in which is placed a short pipe M which has a flange N around its inner end to
rest upon the blanket L and centre plate J. The pipe M is designed to conduct
the bone black into the nozzle B and prevent it from getting into the space
beneath the centre plate J. To the flanged lower end of the nozzle B is bolted a
single gate valve O, the lower end of which is flanged and to it is bolted the cap
plate P which is provided with slotted lugs to receive the fastening bolts. When
the filter is to be washed out, the cap plate P is detached and to the flanged lower
end of the valve O is secured by a collar Q the flanged end of the pipe R through
which the bone black is conveyed to the desired place. In a hole in the lower part
of the valve O is secured a small drip pipe S provided with a valve T so that the
filtered substance that may settle in the nozzle B can be readily drawn off. In
some cases it may be advisable to connect the discharge valve with a hole in the
side of the tank A a little distance above the blanket L as shown at O' in Figure 1
and connect the conveyor pipe R with the said valve. In this case the bone black
in the tank A below the level of the valve O¹ must be shovelled out in the ordinary
manner. With this construction when the bone black is to be removed from the
tank A and taken to some other place to be cleaned, revivified, or otherwise used,
the cap plate P is removed and the end of the conveyor pipe R is secured to the
valve O, and the gate of the said valve is opened. Then as the wash water is
forced into the tank A, it passes out through the pipe R and carries the bone
black with it which can be conveyed by this means to any desired distance, and to
any desired elevation.
Having described the nature of the said Invention and the manner of performing

page_text: the same, I declare that what I claim as new and desire to secure by Letters
Patent is.
1st The method of conveying bone black and similar granulated substances
which consists in forcing water into the vessel containing the substance, and
through a pipe connected with the lower part of the said vessel and leading to the
desired place, substantially as herein shown and described.
2nd The combination with the tank A having discharge nozzle B, the false
bottom D H and the blanket L of the centre plate J having feet K and central
opening, and the flanged pipe M substantially as herein shown and described,
whereby the bone black will be conducted through the false bottom of the tank
without being allowed to pass beneath the said bottom as set forth.
3rd The combination with the tank A having nozzle B, of the valve O and
conveyor pipe R, substantially as herein shown and described, and for the purpose
set forth.
In Witness whereof I the said Alexander Melville Clark have hereunto set
my hand and seal this sixth day of September, A.D. 1882.