Improvements in Filter-presses.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Filter-presses.
I, JOHN CUNINGHAME MONTGOMERIE, of Dalmore, Stair, in the County of Ayr,
Scotland, Justice of the Peace, do hereby declare the nature of this invention
to be as follows:-
This invention relates to an improved construction of filter-press whereby the
space occupied by the solid residuum yielded by the material treated becomes
completely filled, and a more perfect filtering and washing effect is obtained.
In filter-presses as ordinarily constructed, especially those which have a top
feeding channel, I have found, when filtering, a tendency for the upper corners
of the frames to remain unoccupied, or to become but imperfectly occupied by the
solid residuum yielded by the material treated. Under such conditions, when
the cakes are being washed or dried with air, a considerable portion of the wash-
water or air finds its way through these unoccupied spaces instead of through
the mass or cake of residual material. The filter-cloth is, moreover, liable to be
forced into the vacant space or spaces and to be stretched or even torn.
With a view to removing these defects and avoiding the want of efficiency to
which they give rise, I form the interior side of the filter-frame with surfaces which
incline downwards and outwards from the centre where the inlet orifice is located,
thus forming an obtuse angle with the inlet, instead of being disposed at right-
angles thereto as is the present practice. The outlet from the feeding channel is
by preference formed with two mouths or divided into two branches with a view to
spreading the supply laterally and ensuring the complete charging of the upper
portion of the filter-frame. The liquid to be filtered is, by this spreading of
the supply, more evenly distributed throughout the filter-frames, more perfect
cakes and complete filtering being hereby assured.
I, JOHN CUNINGHAME MONTGOMERIE, of Dalmore, Stair, in the County of Ayr,
Scotland, Justice of the Peace, 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 relates to an improved construction of filter-press whereby the

page_text: space occupied by the solid residuum yielded by the material treated becomes
completely filled and a more perfect filtering and washing effect is obtained.
In filter-presses as ordinarily constructed, especially those which have a top
feeding channel, I have found, when filtering, a tendency for the upper corners
of the frames to remain unoccupied, or to become but imperfectly occupied by the
solid residuum yielded by the material treated. Under such conditions, when
the cakes are being washed or dried with air, a considerable portion of the wash-
water or air finds its way through these unoccupied spaces instead of through
the mass or cake of residual material. The filter-cloth is, moreover, liable to be
forced into the vacant space or spaces and to be stretched or even torn.
In the accompanying drawings, Fig. 1 is a face view of a filter-frame having a
top feeding channel and constructed according to my improved method. Fig. 2 is
a corresponding transverse section.
With a view to removing the defects above referred to and avoiding the want of
efficiency to which they give rise, I form the interior side a of the filter-frame with
surfaces which incline downwards and outwards from the centre where the inlet
orifice is located thus forming an obtuse angle with the inlet instead of being dis-
posed at right-angles thereto as is the present practice. The outlet from the
feeding channel bis by preference formed with two mouths or divided into two
branches, cc, with a view to spreading the supply laterally and ensuring the
complete charging of the upper portion of the filter-frame. The liquid to be
filtered is, by this spreading of the supply, more evenly distributed throughout the
filter-frames, more perfect cakes and complete filtering and washing being hereby
assured.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I claim :-
1. In a filter-press provided with a top feeding channel, the improved con-
struction of filter-frame, substantially as herein described and consisting in forming
the interior side of the frame with surfaces which incline downwards and outwards
from the feeding orifice, whereby the complete filling of the space to be occupied
by the filtering material is ensured and other advantages are secured.
2. In a filter-press provided with a top feeding channel, providing the inlet
to the filter-frame with two mouths or branches, substantially as herein
described and whereby the lateral spreading of the supply and the complete
charging of the upper portion of the filter-frame is ensured.
3. In a filter-press provided with a top feeding channel, a filter-frame constructed
substantially as described with reference to the accompanying drawings.
Dated this 11th day of May 1899.
For the Applicant,
G. G. M. HARDINGHAM,
Chartered Patent Agent, Clun House, Surrey Street, London, W.C.