IMPROVEMENTS IN FILTERING APPARATUS
Year: 1878

page_text: LETTERS PATENT to Peter Jensen, of 33, Chancery Lane, London, for the
Invention of "IMPROVEMENTS IN FILTERING APPARATUS." A communication
from abroad by Franz Holzinger, of Gmunden, Austria.
Sealed the 20th August 1878, and dated the 22nd February 1878.
PROVISIONAL SPECIFICATION left by the said Peter Jensen at the Office
of the Commissioners of Patents on the 22nd February 1878.
"
PETER JENSEN, of 33, Chancery Lane, London. IMPROVEMENTS IN FILTERING
APPARATUS." (A communication from abroad by Franz Holzinger, of Gmunden,
Austria.)
Filters made according to this Invention are constructed as follows:-The lower
part of the apparatus consists of a tank or receptacle, say square in form; it is
fitted with a cock at the lower part of one side for the outlet of the filtered fluid.
On this tank a cover with vertical internal flange is fitted so as to make a tight
joint. The cover has a circular central opening, wherein is suspended a ring cover
with horizontal internal flange below, and with a small turned-up part all round for
forming a joint; the vertical part of this ring is perforated to permit the filtered
fluid to escape into the tank. On the horizontal flange rests the filter proper.
This filter is made as follows:-The bottom is perforated and separate from the
body; it has a vertical flange all round, and rests on the ring cover aforesaid of the
tank; it has two clamps which take over two lugs or brackets on the filter cylinder,
uniting it thus thereto. This cylinder is perforated all round, and has two handles
at the top for lifting it by.
The filter paper or felt with which the filter cylinder is to be lined inside is held
by, say, three loose open rings, sprung in one in the middle and one at top and at
bottom. The filtering paper or felt must, when inserted, project about half an inch
below the bottom edge of the cylinder, and there be cut or notched in all round,
and then be bent over in order to prevent the fluid from escaping between the
cylinder and its bottom; the latter is also lined with filtering paper or felt, which

page_text: is held in place by a loose perforated disc resting thereon, and provided with ring or
handle for taking hold of.
The filter is protected against dust or fire, or against loss if used for filtering
ethereal essence, by an outer enclosing casing, say, of sheet iron, and fitted with a
cover; there may be a space of about an inch between the cylinder and the casing.
All parts of the filter may conveniently be made of zinc. If used for acids,
however, the parts may be made of porcelain, and the cylinder would then be
slightly conical; the filtering paper or felt would then be fastened by perforated
rings not cut open.
The filters made according to this construction may be cleaned easily, and so
thoroughly that not the least smell remains from any previously filtered fluid.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Peter Jensen in the Great Seal Patent Office on the 22nd August
1878.
- PETER JENSEN, of 33, Chancery Lane, London. "IMPROVEMENTS IN FILTERING
APPARATUS." (A communication from abroad by Franz Holzinger, of Gmunden,
Austria.)
Filters made according to this Invention are constructed as follows; and this
Invention will be clearly understood by reference to the accompanying Drawings,
of which Figure 1 is a vertical section, and Figure 2 a side elevation, partly in
section; Figure 3 is a side elevation of the apparatus in the closed position:-The
lower part a of the apparatus consists of a tank or receptacle, say square in form;
it is fitted with a cock 6 at the lower part of one side for the outlet of the filtered
fluid. On this tank a cover c with vertical internal flange is fitted so as to make a
tight joint. The cover c has a circular central opening, wherein is suspended a ring
cover d with horizontal internal flange below, and with a small turned-up part all
round for forming a joint; the vertical part of this ring is perforated, as shewn in
Figure 2, to permit the filtered fluid to escape into the tank. On the horizontal
flange rests the filter proper.
This filter e is made as follows:-The bottom f is perforated and separate from
the body; it has a vertical flange all round, and rests on the ring cover c aforesaid
of the tank; it has two clamps g which take over two lugs or brackets h on the
filter cylinder e, uniting it thus thereto. This cylinder e is perforated all round,
and has two handles at the top for lifting it by.
The filter paper or felt with which the filter cylinder e is to be lined inside is
held by, say, three loose open rings k, k', and k³, sprung in, one k¹, in the middle,
one at the top, and one ³ at bottom. The filtering paper or felt must, when
inserted, project about half an inch below the bottom edge of the cylinder e, and
there be cut or notched in all round, and then be bent over in order to prevent the
fluid from escaping between the cylinder e and its bottom f; the latter is also lined
with filtering paper or felt 8, which is held in place by a loose perforated disc /
resting thereon, and provided with ring in the middle, or handle for taking hold of.

page_text: The filter is protected against dust or fire, or against loss if used for filtering
ethereal essences, by an outer enclosing casing m, say, of sheet iron, and fitted
with a cover n; there may be a space of about an inch between the cylinder e and
the casing n.
All parts of the filter may conveniently be made of strong sheet zinc. If used
for acids, however, the parts may be made of porcelain, and the cylinder e would
then be slightly conical; the filtering paper or felt would then be fastened by.
perforated rings not cut open.
Filters made according to this Invention may be made in various sizes, say, from
half a gallon to four gallons or more.
The filters made according to this construction may be cleaned easily, and so
thoroughly that not the least smell remains from any previously filtered fluid.
Both filter paper and felt may be used with it.
With watery fluids an apparatus of 31 gallons capacity filters a like volume in
half an hour.
Oils require one to three days, according to the consistency, to filter a hundred-
weight.
And having thus described the nature of this Invention, I declare that I claim
the general arrangement of parts, substantially as shown and described, and especially
the use of the perforated cylinder and bottom, whereby the filtering is accelerated,
while the parts can be thoroughly cleaned, and felt and filter paper may be used.
In witness whereof, I, the said Peter Jensen, have hereunto set my hand
and seal, this Twenty-second day of August, in the year of our Lord One
thousand eight hundred and seventy-eight.
PETER JENSEN (LS)
PETER JENSEN
(LS)

page_text: Onos Printed by Gronoz EDWARD EYEE and WILLIAM SPOTTISWOOD
Prints to the Queen's most Excellent Majesty 1878