Improvements in Manufacturing Imitations of Stamped Leather-ware.
Year: 1890

page_text: Date of Application. 22nd Nov., 1890-Accepted, 17th Jan., 1891
COMPLETE SPEGILIGATION.
Improvements in Manufacturing Imitations of Stamped
Leather-ware.
1, CARL WITTKOWSKY, of 11, Hornstrasse of Berlin in the Kingdom of Prussia,
German Empire, Manufacturer 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:-
Heretofore imitations of .leather-ware have been manufactured by graining wooden
plates of dark colour in a press under high pressure, but plates with different colours
which have the appearance of dark and bright stamped leather have not hitherto been
obtained.
The object of my invention is to produce a wooden relief-plate in which one part,
having the form of the desired pattern, is of a bright colour and the other part of a
dark colour, one part, both the dark and the bright, being in relief.
To carry out my invention I burn in a wooden plate the required pattern by means
of strongly heated moulds or dies in which the wooden plate is placed and subjected
to a strong pressure. One die is perfectly smooth and the other which is heated, is
partly smooth and partly depressed or embossed, so that only the smooth part of the
mould burns in the required pattern in the wooden plate. By this burning process a
wooden plate of a partly dark and partly bright colour is attained.
The wooden plate is then subjected to the pressure of a hydraulic press, in dies,
which are heated to about 100° C., one die being partly smooth and partly embossed
and the other die heing partly smooth and partly engraved or depressed.
The engraved or depressed part of the second die forms the matrix and the rim
thereof perfectly corresponds to the die being partly embossed and with the engraved
urning die used in the first instance as described.
The burnt wooden plate being subjected to the pressure of the engraved and embossed
die, the pattern of the burnt part of the plate attains a relief form agreeing with the
engravement of the dic, the other part of the plate being smooth.
The burnt dark part of the plate having been impressed by these processes the
corresponding rim of the pattern and moreover a relief or embossed form, has the
appearance of embossed leather-ware.
To increase the effect of the imitation I purpose to grain the bright portion of the
wooden plate, by using an engraved die which is partly grained, so that the engraved
part of the dies is surrounded by grained parts in lieu of the smooth parts before
described. By those means a wooden plate is obtained consisting of a grained bright
part and of a dark relief or embossed part.
Instead of embossing the burnt part of the wooden plate by the action of dies.
baving engravements corresponding to the burnt pattern, I may also emboss the bright.
part of the burnt wooden plate; the burnt parts remain plain, being only subjecte:l
to the action of the plain parts of the dies.
.
When using this reversed method the dark parts of the plate may be grained in the
same manner as before described with regard to the bright parts of the design.
To show more clearly the object of my invention, I refer to the accompanying
rawing, in which similar letters denote similar parts throughout the several views,
nd in which :
Fig. 1 shows a cross-section of the dies a b with the wooden plate p p through the
ine -y of Figs. 2 & 3 ;
Fig. 2 shows an upper view of the die b;
Fio. 3 shows an upper view of the die a. used to burn the dark pattern in a wooden

page_text: Fig. 4 shows a cross-section of the dies cd with the wooden plate through the
line of Figs. 5 & 6.
Fig. 5 shows an upper view of the mould c;
Fig. 6 shows an upper view of the mould d;
Fig. 7 shows a modified form D of the mould in a cross-section through the
line of Fig. 8.
Fig. 8 shows an upper view of this modified form ;
Fig. 9 shows an upper view of the burnt and embossed wooden plate.
The wooden plate is at first subjected to the pressure of the dies ab; the die a
having the deepened parts a' a' is strongly heated and the plate is thereby burnt
and attains a dark colour at the parts pl; the parts p² remain bright as before.
"
The burnt plate pp is then subjected to the pressure of the die d provided with
the embossed or relief parts d' and of the die e provided with the deepened parts c¹
agreeing in the relief form of the embossments and of the deepened parts. The barnt
parts of the wooden plate are subjected to the effect of the embossed parts d' and
of the deepened parts so that they attain a relief form; the bright parts of the
plate remain smooth.
When using the die D with grained parts & after having darkened the plate by the
dies ab the plate is grained at the parts p² and shows a relief form at the dark parts.
The wares manufactured in the herein described manner are used as chair seats, as
framings for doors, of walls, etc.
Having now particularly described and ascertained the nature of this inven
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
In the manufacture of wooden-plates:
1. The method of subjecting the plates firstly to the pressure of a highly heated die
having deepened parts with the rim of the design and secondly to the pressure of dies
having embossed and deepened parts with the rim of the design and with the relief
form of the design, for the purpose as described.
2. The method of subjecting the plates firstly to the pressure of a strongly heated
die having deepened parts with the rim of the pattern and secondly to the pressure of
dies having embossed and deepened parts with the rim of the pattern and with the
relief form of the pattern, one die having besides grained parts, for the purpose as
described.
Dated this 5th day of November 1890.
By FREDK. WALKER,
11, Furnival Street, London, E.C., Agent for the Applicant.