IMPROVEMENTS IN FILTERS
Year: 1877

page_text: LETTERS PATENT to Francis Henry Atkins, of Fleet Street, in the City of
London, for the Invention of "IMPROVEMENTS IN FILTERS."
PROVISIONAL SPECIFICATION left by the said Francis Henry Atkins at the
.. Office of the Commissioners of Patents on the 20th April 1877.
FRANCIS HENRY ATKINS, of Fleet Street, in the City of London.
MENTS IN FILTERS."
"IMPROVE-
This Invention has for its object improvements in the arrangement and con-
struction of filters, so as to facilitate the cleansing of the filtering materials when
clogged or charged with dirt.
Heretofore it has been usual to fix the diaphragms or plates (which divide the
chamber of a filter into compartments and enclose the filtering materials) with
cement or otherwise, and when such filtering materials become foul it is very
difficult to remove the upper plate or division without breaking either it or the
filter, and in order to obviate this difficulty I so arrange and construct the plates or
divisions that they may be firmly fixed in position, and be readily removed and
withdrawn when required. For this purpose I form the upper division plate with
recesses on the edge, so as to pass over fixed projections upon the inner surface of
the filter; the plate is then turned partly round, to bring the edge under the fixed.
projections, which retain it in position.
Inclines may be formed on the plate to act on the under side of the projections,
so as to fix the plate firmly in position. A water-tight joint may be formed between
the parts by means of india-rubber or otherwise.
The bottom plate above the filtered water chamber may either be fixed in the
ordinary manner or in like manner to the upper plate, as previously described.
The cover of the unfiltered water chamber, as applied to ships' filters, may also be.
}

page_text: fixed in the same manner as that previously described, a hole being formed in it for
introducing the water to be filtered.
mather of fiving the plates o
fixed in the same manner as that previously described, a hole being formed in it for
introducing the water to be filtered.
The method of fixing the plates or divisions and the cover may be varied.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Francis Henry Atkins in the Great Seal Patent Office on the 20th
October 1877.
FRANCIS HENRY ATKINS, of Fleet Street, in the City of London.. " IMPROVE-
MENTS IN FILTERS."
This Invention has for its object improvements in the arrangement and con-
struction of filters, so as to facilitate the cleansing of the filtering materials when
clogged or charged with dirt.
Heretofore it has been usual to fix the diaphragms or plates (which divide the
chamber of a filter into compartments and enclose the filtering materials) with
cement or otherwise, and when such filtering materials become foul it is very
difficult to remove the upper plate or division without breaking either it or the
filter, and in order to obviate this difficulty I so arrange and construct the plates or
divisions that they may be firmly fixed in position, and be readily removed and
withdrawn when required. For this purpose I form the upper division plate with
recesses on the edge, so as to pass over fixed projections upon the inner surface of
the filter; the plate is then turned partly round, to bring the edge under the fixed
projections, which retain it in position.
And in order that my Invention may be clearly understood and readily carried
into practice, I will proceed to describe the Drawings hereto annexed.
Figure 1 is a vertical section, and Figure 2 a plan in section of a filter made of
earthenware, glass, or other suitable material, arranged and constructed in accordance
with my Invention.
-
a is the upper and the lower division plates forming the chamber c containing.
the filtering materials. The plate a is formed with recesses a', a', on the edge, so
as to easily pass over the fixed projections d, d, formed on the inner surface of the
filter, and when the plate a is turned partly round by means of the knobs a², a³,
into the position shown in the Drawing, the projections d, d, prevent it from being
raised out of position.
Inclines may be formed on the plate to act upon the under side of the projections,
so as to fix the plate firmly in position. A water-tight joint may be formed between-
the parts by means of india-rubber or otherwise.
The bottom plate above the filtered water chamber may either be fixed in the
ordinary manner or in like manner to the upper plate as previously described.
The cover of the unfiltered water chamber, as applied to ships' filters, may also be
fixed in the same manner as the plate b of the filtering chamber previously described,
a hole being formed in it for introducing the water to be filtered.
The method of fixing the plates or divisions and the cover, so as to be removed-
when required, may be varied.
Having thus described the nature of my Invention and the manner of performing
or carrying the same into practice, I would remark that I do not intend to claim
separately any of the parts which are well known and in common use, but what I
claim is, the improved arrangement and construction of filters wherein the division
plates, in place of being permanently fixed, as heretofore, are capable of being readily

page_text: removed when required, substantially as and for the purpose herein described and
represented in the Drawings hereto annexed.
In witness whereof, I, the said Francis Henry Atkins, have hereunto set my
hand and seal, this Nineteenth day of October, in the year of our Lord One
thousand eight hundred and seventy-seven.
Witness,
T. G. TONGUE,
Patent Agent,
34, Southampton Buildings,
London, W.C.
F. H. ATKINS. (L.S.)