AN IMPROVED METHOD OF AND APPARATUS FOR TREATING HIDES, LEATHER AND TEXTILE FABRICS WITH LIQUIDS
Year: 1883

page_text: LETTERS PATENT to Gerard Wenzeslaus von Nawrocki, Proprietor of the
firm of J. Brandt & G. W. v. Nawrocki, Patent Solicitor and Civil Engineer
of 124 Leipzigerstrasse, Berlin, Germany for an Invention of AN IMPROVED
METHOD OF AND APPARATUS FOR TREATING HIDES, LEATHER AND TEXTILE
FABRICS WITH LIQUIDS a communication from Richard Spitta, sen., of
Brandenburg, in the German Empire
PROVISIONAL SPECIFICATION left by the said Gerard Wenzeslaus von
Nawrocki at the Office of the Commissioners of Patents on the 21st
September 1883.
--
GERARD WENZESLAUS VON NAWROCKI, Proprietor of the firm of J. Brandt &
G. W. v. Nawrocki, Patent Solicitor and Civil Engineer of 124 Leipzigerstrasse,
Berlin, Germany, "AN IMPROVED METHOD OF AND APPARATUS FOR TREATING
HIDES, LEATHER AND TEXTILE FABRICS WITH LIQUIDS," a communication to me
from Richard Spitta sen. of Brandenburg in the German Empire,
This invention has for its object to avoid the time wasting and tiresome taking
out and putting in again of hides in pits or tanks for stirring the tanning or
colouring liquid contained therein. For this purpose the tank or pit containing
the hides is provided with a partition, so as to form a compartment communicating
near the bottom with the main portion of the tank or pit. Into this compartment
fits a piston to which a to-and-fro motion is imparted by means of a beam or other
suitable mechanism, so as to cause liquid to flow alternately into and out of the
main portion of the pit or tank.
The hides are suspended in the liquid by means of laths, of which there may be
several superposed sets. The compartment which contains the piston or equivalent
device for producing a circulation of the liquid, may be placed in any Buitable
position at the side or in the interior of the tank or pit.
Two pits may be placed side by side and made to communicate with each other
when desired; and instead of one piston two pistons may be used connected with
the same beam.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Gerard Wenzeslaus von Nawrocki in the Patent Office on the 19th
March 1884.
GERARD WENZESLAUS VON NAWROCKI Proprietor of the firm of J. Brandt &
G. W. v. Nawrocki, Patent Solicitor and Civil Engineer of 124 Leipzigerstrasse,
Berlin, Germany "AN IMPROVED METHOD OF AND APPARATUS FOR TREATING
HIDES, LEATHER AND TEXTILE FABRICS WITH LIQUIDS, a communication to me
from Richard Spitta sen:; of Brandenburg, in the German Empire,
This invention has for its object to avoid the time-wasting and tiresome taking
out and putting in of hides in pits or tanks, for stirring or renewing the tanning
or colouring liquid contained therein.
In describing the invention, reference will be made to the accompanying
drawing, Figs 1 to 4, which illustrates various forms of apparatus embodying the
. invention.
The tank or vessel may be of any suitable shape, size or material, and may be
placed either in the ground or above it.
Figs and 2 represent in vertical section, horizontal section and plan a
rectangular double tank; the materials to be tanned are suspended inside the
tank, as usual, on laths placed close to each other and supported by beams.
Hitherto these laths, a great number of which are generally used, had to be taken
out several times with the hides suspended on them, for stirring or renewing the
tanning liquid.
This drawback is avoided, so that the hides need only be moved at the beginning.
and at the end of the operation, by the following arrangement:
The inner space D of the tank is divided by a partition (removable or fixed) so
as to form a tube or shaft E, in which the piston b may be moved up and down, so
as to act by suction or pressure on the liquid contained in the inner space D,
through the aperture à.
In this way the liquid in the spače D is set in motion, so as to rise above the
laths h during the down stroke of the piston b and to fall during the up stroke,
thereby continually wetting the whole surface of the hides and preventing the
formation of sediment.
If a double tank is used, as shown in Fig. 1, a suitable communicating channel i
is provided, which may be closed by a slide or valve, so that the two compart-
ments D D' can be used for different liquids or filled and emptied independently
of each other.
For using one of the compartments for tanning smaller hides and utilizing as
much as possible of the space, the laths h¹ h¹ are set in superposed rows, while by
the piston 61 in the shaft E, and the openings c¹ in the partition a¹, the same
effects, as above described, are obtained.
The pistons band b¹ may be either actuated by hand, by means of a balance
lever with which they are connected by the piston rods d d' and which has its
fulcrum e on a suitably placed column, or they may be driven by engine power.
In Figs 3 and 4 this invention is adapted to tanks of cylindrical shape, but the
arrangement and method of operation is substantially the same as in square
tanks,
The laths placed radially in the space D serve to hang up the hides or other
material, and the tanning or colouring liquid is moved and stirred by means of the
piston b, inside the shaft or pit E having apertures c. The lever provided with
handle K and having its fulcrum on the post g is connected with the piston by a
rod d

page_text: The piston may, however, be set in motion by engine power, by means of obvious
nodifications.
The same apparatus and arrangement is applicable for treating hides with lime
and unhairing them, as well as for dyeing textile fabrics; leather and similar
naterials.
The pipe m provided with a screw plug m¹ serves to fill and empty the tank.
Instead of using vertical shafts E, E, with vertically moving pistons, the same
nay be placed horizontal or inclined, and the driving mechanism made to
orrespond
CLAIMS:
The method of causing a circulation of liquids in closed tanks; pits, or vessels,
for the purpose of preventing the formation of sediments and for bringing them
in uniform contact with the hides or other materials contained in the tank, pit or
vessel.
The use of pistons b, 61, adapted to move in suitable shafts or cylinders E, so as
to act by suction and pressure on the liquid contained in the tank D, and to
produce a circulation of the same.
The whole substantially as described and for the purposes specified.
In Witness whereof I, the said Gerard Wenzeslaus von Nawrocki, have hereunto
t my hand and seal this 15th day of March A:D. 1884.
GERARD WENZESLAUS VON NAWROCKI. (L.S.)