Improvements in Filtering Apparatus.
Year: 1897

page_text: Date of Application, 29th Oct., 1897-Accepted, 15th Oct., 1898
COMPLETE SPECIFICATION.
Improvements in Filtering Apparatus.
We, HEINRICH BERTRAND, of No. 10, Obermackt, Worms, Merchant, and
WILHELM KNECHT, Fitter, of the same address, do hereby declare the nature of
our said invention and in what manner the same is to be performed to be parti-
cularly described and ascertained in and by the following statement:—
The object of the present invention is a filter-press in which thoroughly dry
filtering material can be used instead of wet material. In consequence of this
new arrangement the new filter press has the advantage of greater cleanliness and
of being put into operation, with greater rapidity. When such a press is em-
ployed in various industries such as sugar-refining brewing &c. a preliminary
vessel or preliminary filter is quite unnecessary as filtered liquid can be run off
at once which is not the case in any of the systems hitherto known. Moreover
all loss of liquid is entirely prevented.
The new filter press is illustrated in the following drawing.
Figure 1 is a side view.
Figure 2 is a front view.
Figure 3 the inspection glass and pressure gauge for the testing cock in detail.
The present filter apparatus belongs to the class of so-called frame filters. It
consists of several frames B fixedly inserted in a common holder a. These frames
support perforated plates c (Fig. 2). The holder, as also the frames b and the
plates c are made of pure copper to prevent as far as possible the deposition of
slime resulting from the filtering process. Thin layers of thoroughly dry filtering
material e are placed upon the perforated plates c.
This material may be either of an organic or inorganic nature, it is therefore
optional to use pumice stone cakes, asbestos layers or filter-cloths, such as usual
in sugar refining between the plates. The filter material is pressed against the
plates c by movable collars d.
The holder a has trunnions A on each side, which are supported in the frame f
of a portable framework 9 so as to make the receptacle revoluble for the purpose
of handling, dismounting and cleansing the apparatus.
The liquid to be filtered is conducted in the following manner.
The liquid enters into the first inspection glass at B and passes through the
tube S into the filtering-apparatus. As soon as the liquid has passed through the
filtering apparatus it is forced into the tube p then through the openings q into
the second inspection glass n which is provided with the testing cock o.
Above the testing cock o is a pressure gauge r to measure the pressure during
the filtering process.
The holder a is further connected by a pipe m with a third inspection and
pressure glass k through which the filtered liquid runs out by means of the pipe i
and the cook h

page_text: Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is:
CLAIM.
A dry filter apparatus characterised by having a copper holder (a) capable of
turning on bearings (A) of a portable framework (f, g) with fixed frames (b)
supporting perforated plates (c) and the filtering material also an inspection
glass (n) with testing cock (o) and pressure gauge (r) into which holder the pipe (s)
coming from the first inspection glass (B) opens, while the outlet pipe (m) is
provided with a third inspection glass (k) and an exit cock (h).
Dated this 20th August 1898
GEORGE BARKER,
Fellow of the Chartered Institute of Patent Agents,
77, Colmore Row, Birmingham, Agent, for Applicants.