Improvements in and relating to Filter Presses and similar Filtering Apparatus.
Year: 1898

page_text: Date of Application, 21st Dec., 1898
Complete Specification Left, 20th Sept., 1899-Accepted, 4th Nov.,
1899
PROVISIONAL SPECIFICATION.
Improvements in and relating to Filter Presses and similar Filtering
Apparatus.
I, JOHN WILSON, of 1, Hill Street, Garnethill, of the County of the City of
Glasgow, North Britain, Analytical Chemist, do hereby declare the nature of
this invention to be as follows:-
This invention which relates to filter presses and similar filtering apparatus
belongs to that type wherein the filtering medium is composed of cloth, and
wherein the revolving brushes are used for the periodic cleaning of the filter-
ing cloth, and further where frames are used for the cake in conjunction with
plates, has for its object the provision of means for removing the cake and
thereafter cleaning the filtering cloth aforesaid.
In carrying my invention into practice I attach the rollers-upon which the
filtering cloth is drawn through the press-to the plate only, two at the top, and
one at the bottom, and in such manner that I can draw out the plates and
frames in succession by the usual method, and so ensure a clear space being
left for knocking out the cake formed within the frame.
In lieu of attaching the framework of the filterpress to the bed-plate upon
which the revolving brushes are fixed for the cleaning of the filtering cloth
aforesaid I form the same apart, but fitted with rollers underneath.
These rollers run upon a pair of rails laid at a suitable height and position
below the filter-press, and relatively to the position of the bottom rollers, on
the plates when these are opened out for the cleaning of the filtering medium.
When it is desired to remove the cake, the bed-plate is moved from below,
the rails extending the requisite distance on either or on both sides of the
press.
In cases where it is inconvenient to shoot the cake through the floor upon
which the press stands a second set of rails are provided within and at a lower
level than the rails upon which the bed-plate with the brushes run.
Upon these lower rails is run a flat tray or bogie for holding the cake, so
that either the tray or the brushes may be in use at will.
Where several presses are in use one tray and one set of brushes may be
utilized in common with all by extending the rails accordingly, the presses
being placed in proper position for that purpose.
As it would be undesirable to cut or disconnect the filtering medium or cloth
at any time the nipping rollers are so fixed within their bearings that the upper
one can be readily removed, and replaced; and rollers are also provided at
suitable position below the rails for further maintaining the continuous winding
of the cloth.
In order to ensure the brushes coming into full contact with the cloth
whilst passing over the rollers I have the shafts upon which the brushes are
mounted attached to short arms hinged at the bottom of the bed-plate. These
arms are provided with a spring which tends to draw them towards the rollers.

page_text: By suitable mechanism they are likewise simultaneously thrown out of contact,
and prevented from pressing too hard upon the bottom rollers. The pulleys
driving the shafts of the brushes are also driven from each other by stout india-
rubber belts or bands, or by other suitable means, thereby allowing the same
to accomodate themselves to the position into which the brushes are drawn
by the springs.
As it is desirable that the plates, or plates and frames be equidistant from
each other whilst the cloth is being wound through them and the brushes are
revolving I attach to each plate or frame two or more distance pieces formed
with a knuckle joint, to make allowance for the condition of the press, whether
it be closed or opened. Other attachments may be adapted for the same purpose.
Dated this 19th day of December 1898.
JOSEPH HENRY PEARSON,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in and relating to Filter Presses and similar Filtering
Apparatus.
I, JOHN WILSON, of 1, Hill Street, Garnethill, of the County of the City of
Glasgow, North Britain, Analytical Chemist, do hereby declare the nature of
this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:-
This invention which relates to filter presses and similar filtering apparatus
belongs to that type wherein the filtering medium is composed of cloth, and
wherein the revolving brushes, are used for the periodic cleaning of the filter-
ing cloth, and further where frames are used for the cake in conjunction with
plates, has for its object the provision of means for removing the cake and
thereafter cleaning the filtering cloth aforesaid and is a further development
of my previous Patent No. 18074, A.D. 1898.
In carrying my invention into practice I attach the rollers upon which the
filtering cloth is drawn through the press to the plate only, two at the top, and
one at the bottom, and in such manner that I can draw out, the plates and
frames in succession by the usual method and ensure a clear space being
left for knocking out the cake formed within the frame.
In lieu of attaching the framework of the filter press to the bed-plate upon
which the revolving brushes are fixed for the cleaning of the filtering cloth
aforesaid I form the same apart, but fitted with rollers underneath.
These rollers run upon a pair of rails laid at a suitable height and position
below the filter press, and relatively to the position of the bottom rollers, on
the plates when these are opened out for the cleaning of the filtering medium.
When it is desired to remove the cake, the bed-plate is moved from below,
the rails extending the requisite distance on either or on both sides of the
press.
In cases where it is inconvenient to shoot the cake through the floor upon
which the press stands a second set of rails are provided within and at a lower
level than the rails upon which the bed-plate with the brushes run. Upon
these lower rails is run a flat tray or bogie for holding the cake, so that either
the tray or the brushes may be in use at will.
Where several presses are in use one tray and one set of brushes may be
utilized in common with all by extending the rails accordingly, the presses
being placed in proper position, for that purpose.

page_text: As it would be undesirable to cut or disconnect the filtering medium or cloth
at any time the nipping rollers are so fixed within their bearings that the upper
one can be readily removed and replaced, and rollers are also provided at
suitable position below the rails for further maintaining the continuous winding
of the cloth.
In order to ensure the brushes coming into full contact with the cloth
whilst passing over the rollers I have the shafts upon which the brushes are
mounted attached to short arms hinged at the bottom of the bed-plate. These
arms are provided with a spring which tends to draw them towards the rollers.
By suitable mechanism they are likewise simultaneously thrown out of contact
and prevented from pressing too hard upon the bottom rollers. The pulleys
driving the shafts of the brushes are also driven from each other by stout india-
rubber belts or bands, or by other suitable means, thereby allowing the same
to accomodate themselves to the position into which the brushes are drawn
by the springs.
As it is desirable that the plates, or plates and frames be equidistant from
each other whilst the cloth is being wound through them and the brushes are
revolving I attach to each plates or frame two or more distance pieces formed
with a knuckle joint, to make allowance for the condition of the press, whether
it be closed or opened. Other attachments may be adapted for the same purpose.
In order that my invention may be properly understood and readily carried
into effect I have hereunto appended two explanatory sheets of drawings in the
several figures of which corresponding parts are marked with the same letters
of reference.
Fig. 1 is a longitudinal elevation partly in section of my improved filter-
press shewing the arrangement of the rollers upon the plates and the position
of the same at a particular stage of the cleaning operations.
Fig. 2 is a part side view shewing the attachment of two rollers to the top
of each plate and represents the position of the roller bearings when the filter-
press is closed up.
Figs. 3, and 4, are side elevation and end view respectively of the nippings
rollers.
Figs. 5, and 6, are part elevation and part section representing the plates
and frames when opened out.
Figs. 7, and 8, are similar views representing the plates and frames when
closed and,
Fig. 9, is a front elevation illustrating the method of mounting the brushes.
Referring to Fig. 1, the frames have all been emptied of their contents and
the plates and frames in course of being brought into position for the brushing
of the cloth. One frame is shown midway between two plates as illustrating
the method of isolating the frames when knocking out the cake.
The rollers upon the plates, the revolving brushes with the bedplate upon
which they rest, the receptacle for the cake and the two cross rails are shown
in section in order that the invention may be better understood from the
description.
The general course of the filter cloth which is formed of an endless band, is
vertically up and down zig-zag wise between the plates and frames of the filter-
press but for the purpose of guiding the same instead of affixing one roller to
the top of each frame I attach two rollers to the top of each plate as shewn in
Fig. 2, which represents the position of the roller bearings when the filterpress
is closed up as previously referred to.
The bed-plate G, is formed independently of the front head A, and the back
gauntress S, and is provided with depending suitable projections or brackets G¹
which rest upon the pulleys G³. The said pulleys G2 run upon rails G³ forming
part of the inner frames G. The said inner frames G are fixed in such a posi-
tion that the brushes K¹ come into proper contact with the bottom rollers D¹.
The inner frames G4, constitute two inner rails G5 upon which runs a bogie

page_text: or receptacle G6. The purpose of this bogie Go, is to hold all the solid matter
resulting from filtration, contained within the frames of the press and which
must first be removed before the brushing operations commence.
When it is desired to remove the cake the bed-plate G, with the brushes K¹
is moved from below and the bogie G6, is exposed, and as shown, is in its posi-
tion to receive the cake.
The inner frames Gʻ may project to any necessary distance on either side of
the press and beneath any number of presses when the use of such is found
expedient, in which case one set of brushes, and one cake receptacle only may
be found necessary.
In cases where it is found permissable to erect the press at a sufficient height
the bogie or receptacle G, would not be required.
As it would be undesirable to cut or disconnect the filtering cloth at any
time, the nipping rollers F, F', are so fixed within their bearings that the
upper one can be readily removed and replaced.
The block frames F³, holding the upper roller F, are made in the form of
straps, to embrace the lower block frame F³. Provision is made for the accomo-
dation of the keys F which is such that the upper block frame is firmly
attached to the lower block frame.
As these keys are readily removed, the two rollers F, F¹, are thereby easily
separated. I do not confine myself, however, to this or to any other particular
method of attaining the same object.
In order to ensure the brushes coming into full contact with the cloth whilst
passing over the rollers D' I have the shafts upon which the brushes are mounted
attached to short arms hinged at the bottom of the bed-plate.
Instead of fixing the brushes K¹, solidly thereto I have them swinging in
the arms G7 pivoted at G8 as seen in Fig. 9. These arms are connected by the
links G working outside the pins or studs G10, which are attached to the
arms G. By these means the handle G" can simultaneously throw all the
brushes K', out of gear and so enable them to travel freely below one or a series
of presses. The springs G₁, are provided for drawing the brushes into contact
with the filtering medium or cloth, travelling over the rollers D¹ but the brushes
are prevented from pressing harder than is necessary. The spindles D³ of the
rollers D' project sufficient distance to prevent the arm G7 from being drawn
by the spring G12 too near to the said rollers.
Pins G3, are provided to counteract the effect of the spring when the bed-
plate G is withdrawn from beneath the press. To make allowance for the
variations of the position of the brushes the driving belts between the pulleys
not shewn on the drawings, but described and illustrated in my previous patent
aforementioned would preferably be made of india-rubber.
As it is desirable that the plates or plates and frames be equidistant from
each other whilst the cloth is being wound through them and the brushes are
revolving I attach to cach plate or each plate and frame two or more distance
pieces formed with a knuckle joint to make allowance for the condition of the
press whether it be opened or closed. At convenient parts of the edges of the
plates or frames are fixed hinged members D6 jointed at D7. The moveable
part or flap Ds, is made of such a length that when it meets the butt end of
its adjacent member it keeps the plates or plates and frames apart the required
distance while the filtering cloth is drawn through the filter-press by the nip-
ping rollers F, F¹. The moveable part of these members Ds can readily be
withdrawn, when necessary to close up the filter press. I do not however con-
fine myself to this or to any other particular form of attaining this end.
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―
1. In a filterpress wherein the deposit formed consists of a cake the combina-

page_text: tion of two rollers to the top and one at the bottom of each plate for carrying
the filtering cloth, the detachable nipping rollers whereby the filtering cloth
can be taken out of the press, the hinged device illustrated in Figs. 5 to 8, for
keeping the plates or plates and frames the requisite distance apart while the
filtering cloth is drawn through the press, and the means of throwing the cleans-
ing brushes in and out of contact with the filtering cloth substantially as
described and shown on the accompanying drawings.
2. In a filterpress or presses wherein the deposit formed consists of a cake the
combination of a moveable bed-plate provided with pulleys which run upon
rails, means employed for carrying the cleansing brushes which are arranged
to be brought into operation in either a single or multiple press, a bogie mounted
on wheels which runs upon rails placed beneath the said bed-plate for receiving
the cake as it is discharged from the press or presses substantially as described
and shown on the accompanying drawings.
Dated this 19th day of September 1899.
J. H. PEARSON,
Agent for Applicant.