Improvements in Filter-presses.
Year: 1893

page_text: Date of Application, 11th Sept., 1893
Complete Specification Left, 11th July, 1894-Accepted, 11th Aug., 1894
PROVISIONAL SPECIFICATION.
Improvements in Filter-presses.
I, JOHN CRITCHLOW, 25 Shelton Old Road, Stoke-on-Trent, Staffordshire,
Engineer do hereby declare the nature of this invention to be as follows :-
This my invention relates to an improved construction of trays for filter presses,
such as are used for clarifying or purifying "potter's slip," and the object of my
said invention is to construct and mount such trays upon their framing so that they
may be more readily handled or manipulated than the trays of filter-presses
mounted in the usual manner.
To carry my said invention into practice I make such trays of or from wood or
wood and metal of any suitable shape and size with a metal or wood arm of
suitable shape and size projecting from each side of each tray, in the under side
of each arm I form two suitably shaped slots of suitable depth, into each of
which slots I fit or fix a suitably shaped metallic, earthenware or wood roller,
which rollers are capable of being rotated on suitable axes, the lower edges
or circumferences of the said rollers extending a suitable distance below the
lower side or surface of such arms, so as to bear upon the side framing of such
presses.
A short distance below each of the projecting arms, and to the sides of each tray
I also fit or fix by screws or other suitable means a suitably shaped roller made of
or from metal, earthenware, wood or other suitable material.
It will be understood that when such trays are mounted between the framing of
such presses a portion of the circumference or edges of the rollers which are partly
embedded in the underside of each projecting arm will bear upon the side railings
of the framing of the press, so that such trays can be packed together for used or
moved apart very readily.
Dated this 9th day of September 1902
JOHN NEWTON,
Longport, Staffs, Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Filter-presses.
JOHN CRITCHLOW 25 Shelton Old Road Stoke-on-Treut Staffordshire
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 my invention relates to au improved construction of trays for filter-presses
such as are used for clarifying or purifying "potter's slip," and the object of my
said invention is to construct and mount such trays upon their framing so that they
may be more easily and readily handled or manipulated than the trays of filter
presses mounted in the usual manner.
In order that my said invention may be more readily understood and explained
in detail I have hereunto annexed two sheets of drawings on which letters of
reference are marked on corresponding parts on all the figures alike.

page_text: DESCRIPTION OF DRAWINGS.
Figure 1 is a side elevation of a filter press and a part of its framing made.
according to my invention.
Figure 2 is a front elevation of each end metallic plate of such presses.
Figure 3 is a plan view of Figure 2 with the top corner brackets removed.
Figure 4 is a plan view of each end plate of such presses, shewing one method
of tightening up or screwing and retaining the several trays of such presses
together.
Figure 5 is a front elevation of one of the intermediate trays of such filter
presses.
Figure 6 is a plan view of Figure 5.
Figure 7 is an enlarged sectional plan view through the line A-B of Figure 5
looking in the direction indicated by arrow x.
Figure 8 is an enlarged sectional plan view through the line C-D of Figure 5,
shewing two of such intermediate filter-press trays, when several trays are
tightened one against the other.
.
In these figures a represents a part of the wooden portion and b a part of the
metallic portion of the framing of such improved filter-presses.
The several intermediate wooden trays c and the end metallic plates or trays d
are supported by the metallic side rails 6 of the framing by means of their
respective arms and d. To the underside of each arm of the intermediate
wooden trays c I have shewn attached or fastened two brass rollers o³ and to each
side or edge of such intermediate trays c at a suitable distance below their
handles attach or fasten by screws or other suitable means a metallic roller c*.
The end cast iron plates d 1 prefer to make with slotted corner brackets or
projections d', and on each arm of such end plates d I form or attach suitable
projecting arms or brackets between which arms I mount or fit a brass
roller do.
It will be understood that after a filter-press cloth of suitable shape and size has
been placed between the channelled or grooved portions e of the trays of such filter
presses, the said trays and d are pushed or forced into the position shewn at
Figure 1, the rollers c and d bearing upon the top side of the metallic sides b of
the framing, and the rollers c bearing against the inner side of each said rail b.
To enable such trays to be forced tightly against each other I mount a metallic
threaded shaft f at one end of the framing of such presses, the inner end of the said
shaft bearing or pressing against the end metallic plate d nearest thereto, a suitably
shaped block.or pieces of metal or wood being inserted between the metal plate d
and the opposite end of the metal framing b, a cast iron toothed wheel being
fitted on such shaft f near to its outer end, and a pawl and ratchet handle k
similar to the ordinary reversing lever on locomotives, which handle when
operated forces the end of such shaft forward against the front end metallic
plate d.
When "slip" is pumped or forced into such trays through the metal pipe i and
through brass or other suitable metallic tubes j, the slip is caused to enter the filter
cloth placed between such trays, and when the divided, internally threaded metallic
clamp h is released by removing the metallic ring or loop, such trays can be
readily moved apart by withdrawing the shaft f. and the filter cloths containing the
filtered slip removed from between the several trays.
I would have it understood that such filter presses can be made of any suitable
shape and size, the inner side of each eud plate d be fitted with a channelled or
grooved wood portion similar to the intermdiate trays, the grooved or channelled
portion of such trays may be made of one piece of wood grooved on both of its
sides as shewn at Figure 8, or made of two separate pieces as shewn at Figure 7, or
the strips may be nailed, screwed or otherwise fastened to the body of the trays.
The several trays are more firmly held together by means of metallic rods (, fitted

page_text: into the slots of brackets d³ of the end plates d, one end of each rod being screwed.
and fitted with a suitable nut or nuts m.
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
The method of mounting the trays of filter-presses with metallic rollers, and the
tightening up and releasing gear for such filter-presses in the manner and for the
purpose as herein substantially described, set forth and fully illustrated on.
the drawings hereunto annexed.
THIS TO uay or
1894.
JOHN NEWTON,
Longport, Staffs, Agent for Applicant..