Improvements in Filtering Apparatus.
Year: 1889

page_text: Date of Application, 31st July, 1889
Complete Specification Left, 30th Apr., 1890-Accepted, 21st June, 1890
PROVISIONAL SPECIFICATION.
Improvements in Filtering Apparatus.
I, JOHN MOTTRAM SMALES St. Pancras Schools Leavesden Herts. do hereby declare
the nature of this invention to be as follows:-
This invention consists of a solid disc which may be made of cast iron thin sheet
metal or other material. The said disc has a circular opening in the centre, and
round this opening is a boss which has radial internal openings. A series of such
solid discs is mounted on a centre shaft which is hollow and has slots or holes.
said solid discs are separated from one another by collars or distance pieces which
fit round the hollow shaft and extend from the boss of one disc to the boss of the
next disc.
The
The two sides of each solid disc have radial or circular grooves and when the disc
is made of thin metal such grooves may be stamped to facilitate the flow of the filtered
liquid to the boss round the central opening.
Cotton-cloth, felt or other filtering medium is stretched over each side of the said
solid disc a hole being cut to correspond with the central opening where it is secured
between the boss and the collar or distance piece, and is also secured at the periphery
by being clipped or in other convenient manner.
Dated this Thirty-first day of July 1889.
COMPLETE SPECIFICATION.
Improvements in Filtering Apparatus.
I, JOHN MOTTRAM SMALES of St. Pancras Schools Leavesden near Watford Herts.
Resident Engineer 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 consists of a solid disc which may be made of cast iron thin sheet
metal or other material. The said solid disc has a circular opening in the centre and
round this opening is a boss which has radial internal openings. A series of such
solid discs is mounted on a centre shaft which is hollow and has slots or holes. The
said solid discs are separated from one another by collars or distance pieces which
fit round the hollow shaft and extend from the boss of one disc to the boss of the
next disc.
The two sides or faces of each solid disc have radial or circular grooves and when
the disc is made of thin sheet metal such grooves may be stamped to facilitate the
flow of the filtered liquid to the boss round the central opening.
Cotton cloth felt or other filtering material is carefully stretched over each side of
the solid disc so as to be perfectly smooth and free from folds or creases and is
secured at the periphery by being clipped or in other convenient manner. A hole
is then cut in the said material to correspond with the central opening in the solid
disc which is then mounted on the hollow shaft and a collar or distance piece placed
next it. A series of solid discs and collars being thus mounted on the hollow shaft
the whole of them are screwed up tightly by means of a nut at the end of the shaft
and this has the effect of securing the filtering material round the shaft by reason of
the face of each collar pressing against the adjoining face of each boss.

page_text: DESCRIPTION OF THE DRAWINGS.
It
Each
Figure 1 represents a section of a solid disc (a) constructed in accordance with one
form of my Invention and may be advantageously made of cast iron. Figure 2
represents an elevation of a part of one of the sides or faces of the said solid disc.
has a central opening and round this opening is a boss which is partly hollow.
face or side is covered with a series of ribs and grooves (marked respectively (b)
and (¹)) extending between radial channels or grooves (c). Each channel (c) leads
to and terminates in a hole (d¹) in the central boss (d). Cotton cloth felt or other
filtering material is stretched over each side of the solid disc (a) and secured on the
edge or periphery by the two pieces being sewn together or clipped with a metal band
or fastened in any convenient manner, the edge or periphery being flat as shown on
Fig. 1 or otherwise according to the method adopted for securing the filtering
material.
A hole is cut in the said material corresponding with the central opening in the
solid disc and a series of such discs is mounted on a centre tube or hollow shaft (f).
This shaft has longitudinal grooves (g) and holes (4). The solid discs are separated
from each other by means of collars or distance pieces (i). The ribs (b) and
grooves (6) may be radial instead of circular as shown on Fig. 2, and form a series
of channels all converging from the periphery towards the boss.
According to another part of my Invention a solid disc may be made with a thin
sheet of metal having circular or radial ribs and grooves—or both circular and radial
ribs and grooves-stamped on it and such ribs or grooves would form a series of
corrugations and greatly tend to strengthen the said thin sheet of metal. A solid disc
formed in this manner has an opening or hole in the centre round which a boss is
formed by means of two rings viz. one ring each side of the metal sheet. The outer
face of each ring is flat but the inner face next the sheet has radial grooves nearly but
not quite fitting with those on the sheet thus leaving spaces for liquid to pass between
the ring and the metal sheet to the hollow shaft upon which such discs are intended
to be mounted. The two rings are rivetted or fastened in other manner to the metal
sheet. The extreme edge or periphery of the sheet may be turned over or a separate
ring rivetted or fastened on so that the filtering material can be secured without being
cut or injured by the thin edge of the sheet itself.
Figure 3 represents a series of solid discs (a) mounted on a hollow shaft (f) and
each separated from the next by a collar (i) thus forming a complete filter.
A spur
wheel (1) is secured on the shaft and the series of discs and collars screwed up
tightly by means of the nut (k). The whole set is placed in a cistern (m) one ond
of the shaft being solid and resting on a bearing bar (n) and the opposite end passing
through a stuffing box (o) or any suitable arrangement to prevent leakage from the
cistern round the shaft.
The liquid to be filtered is admitted to the cistern, filters through the filtering
material which has been stretched over each solid disc, leaving the deposit arrested
by filtration on the outside whence it is easily washed off with a jet of water or in
any convenient manner. Or motion may be communicated to the spur wheel (1) thus
causing the entire set of solid discs and the hollow shaft upon which they are
mounted to revolve so that the deposit arrested by filtration can be washed off
more readily than when the discs are stationary. The liquid after passing through
the material follows the course of the grooves and channels to the holes in the boss
and into the hollow shaft by means of the holes provided for this purpose and is
conducted outside the cistern.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed I declare that what I
claim is :
Winst A filto's
ald diens advanfa convaly mods of cast

page_text: iron so formed that cotton cloth or other filtering material can be stretched tightly
and free from folds or creases over each of the two sides or surfaces the said
filtering material being fastened round the periphery and secured round the central
opening in such solid discs when mounted on a hollow shaft by means of a separate
collar forced against the side face of the boss surrounding such opening substantially
as herein described and shewn on the drawings annexed hereto.
Second. The formation of a solid disc by means of a thin sheet of metal having
ribs and grooves stamped thereon with a central opening and boss substantially as
hereinbefore described.
Dated this Twenty-ninth day of April 1890.