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Патент USA US2113679

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April ‘12, 1938.‘
' Filed May 25, 1956
Wilhelm Cle?, Sackingen, Germany
Application May 25, 1936, Serial No. 81,785
In France June 3, 1935
2 Claims.
According to the present invention the method
of producing. plastic surfaces on wood is carried
into effect by a device in which, in- a single process the wood to be treated is moved by a feeding
5 device, which latter may bevinstantaneously adj-usted to several different speeds, the wood being
?rstly subjected to the charring'effect of a wide
burner. After the surface of the wood to be
treated has been subjected to the charring or
10 burning effect of the wide burner, said surface in
its travel passes a cooling device which acts on
the charred surface and affects the heat arising
from- the char'ring action before such heat can
" reach the inner core of the .wood which thereby
15 prevents the wood from losing its shape. The
cooling'device serves at the same time to prevent
the discharge of flames and sparks into the decarbonizing and cleaning chamber arranged ad-v
jacent thereto. The _decarbonization and the
2 production of‘ theplastic variegated wood takes
place in the cleaning chamber by means of a
number of specially formed quickly rotating
grinding rollerslarranged onebehind the other
i 2
- '
(01. 41--1)
that the burning of one surface only would pro
duce stresses in the wood so that it wouldv not re
main in its original shape. After this carbonizing
process had been effected the surfaces were pro
vided with the desired ornamentation or decora- 5
tion by brushing, rubbing and so on.
The advantage of a variegated surface on one
side of the wood only, effected by the plastic
treatment of the annual hard concentric rings of
growth consists in that the wood is instantane- 10
ously and quickly charred by means of a hot
,?ame, the quicker the better, wherein the pas
sage speed of travel of the wood, e?ected by the
_feeding device, Which is adjustable for differ
ent speeds, plays an important part and that im- 15 ,
mediately afterwards the heat caused by the
charring action. before it can penetrate into
‘the core of the wood, is cooled by means of a heat
cooling device which thus renders it possible to
obtain for panelling and the like purposes 20
straight and nonewarping surfaces, the proper
ties of which, as regards warping, are the same as
ordinary wood. It is more economical to subject
in vthe direction of the grain which act on the
to a charring action one side only of wood used
Surface of the wood, such grinding rollers being
for panelling or like decoration because the treat- 25
5 exactly adjusted or tuned relatively to each other
and consisting of rough, medium and ?ne rollers
as well as polishing rollers. The special con-
ment of both sides serves no purpose and is un
, The accompanying‘ drawing diagrammatically
struction of the grinding rollers also renders pos-
illustrates the device used for carrying said meth
30 sible‘ the decarbonization and ?ne grinding of
. slightly chamfered or ?uted pro?les and of hol-
. od into effect and wherein:-—
Figure 1 shows a‘longltudinal section of the de
low and round boards. The grinding rollers acting in the direction of the grain remove more or
less deeply charred parts _of the soft wood, and
35 the adjustment of the feed device to a certain
speed of rotation more or less helps to give lightor or darker tones. The grain of _the wood char‘red or burned in the carbonizing process remains
and stands out in a plastic form from the charred
40 basic surface.
In methods hitherto known for the ornamen. tation or decoration of wood, in which wood is
burned, charred or carbonized, the more or less
charred parts of the wood are removed by rub-v
45 bing with wet cloths or brushes. The burning is
done in ‘primitive manner by hand with a soldering lamp in a similar manner to painting with a
brush. It is obvious, that by treating the wood
in this manner even an expert cannot produce
‘50 the graduated and uniform tone of colours‘ desired. In other methods, although they give continuous working all parts of the surface are however charred because the same amount of heat
is applied for the same length of time, these
35 methods being based on the incorrect principle
vice; Fig. 1a shows a conventional step pulley
which may be adjusted to alter the speed of a feed
roller; Fig. 2 shows a cross-section taken on line
I--I of Fig. 1; Fig. 3 shows the cross-section of a 35
cleaning and grinding roller; Fig. 4 shows the
cross-section of a polishing roller; Fig. 5 shows a
comb for a polishing roller.
Above the table frame A is arranged a heating
or burning chamber B consisting of a casing open 40
at the underside, in which are ?tted known types
of wide burners i equipped with air adjusting
_means. Behind the burning chamber B is ar- '
ranged a cooling device 0. The latter consists of
a water tank 2» the longitudinal side walls 3 of 45 which conver_;e conically towards the bottom
leaving an open slot 4 to receive a hygroscopic
strip of material or cloth 5 protruding at the out
side, such as a cotton wick or the like. The water
tank 2, which is supported in a frame 6 secured 50v
to the table frame A and pressed downwardly by
the springs ‘i, can be adjusted in height by means
of the screw-threaded spindles 8. The distance
between the _wood to be treated and the outlet
of the tank can thus be accurately adjusted. _55
Next to this cooling device 0, is disposed the de
carbonizing and cleaning chamber D in which
are ?tted a number of quickly rotating grinding
rollers specially constructed for the purpose to
which they are to be adapted. The grinding roll
wood previously heated by the burning or char
ring action on its surface before the heat reaches
ers. which are intended for different purposes,
can also be lodged individually in separate cas~
ings. ' For their particular purposes, the ?rst roll
chamber D in which first of all the charcoal dust
is removed by means of the ?rst rough grinding
roller 9 which dust is drawn away by the ?ue l9
which forms an extension of the dome-shaped
ers 9, which effect the decarbonization, have
rougher surfaces than the next following rollers
10 l0 serving for cleaning and grinding and the pol
ishing rollers I l. The cleaning and grinding roll
the core of the wood so preventing the wood from
losing its shape. From the cooling device C, the
wood reaches the decarbonizing and cleaning in
cover [8 and is connected to an exhaust fan or 10
like device. On its further travel, the wood
passes through a number -of grinding rollers [0,
ers ID, the bristles of which consist of crimped , which are arranged one behind the other and
steel or brass wire, are provided with three equal
ly spaced gaps l2 (Fig. 5) over the circumference.
15 The bristles of the grinding rollers which are
subjected to pressure can thus more easily adapt
themselves to the shape of the surface to be
ground, than would be the case if the bristles en
tirely covered the roller.
The crimped steel or
20 brass wire bristles have the same tearing and
grinding effect as sand paper on the surface of
the wood so that even pro?led parts and hollow
boards can be treated perfectly. The'circumfer—
ence of the polishing rollers l l are provided with
25 a number of equally spaced exchangeable comb
like strips l3 made of leather; rougher or ?ner
combs may be used in accordance with the na
ture of the surface to be treated. Underneath
these grinding rollers, on the table frame A are
exactly adjusted to each other until ?nally it
reaches the polishing rollers H which remove
all charcoal particles still remaining on‘ the sur
face of the wood and polish its surface.
I claim:-—
1. Apparatus for producing a plastic varie
gated surface on wood comprising, in combina- ~
tion, a table, a burning chamber mounted on said
table, burners mounted in said chamber for char
ring wood, a cooling chamber containing water
mounted on said table in juxtaposition to said
burning chamber, an opening in‘ the bottom of
said cooling chamber, absorbent material located
in said‘ opening, a decarbonizing and cleaning
chamber mounted on said table next to said cool
ing chamber,abrasive and polishing rotarybrush
es mounted in said cleaning chamber, adjustable ~
30 arranged additional guide rollers M for the wood
means carried by the table at one end for feeding
l5 to be treated and in front of the chamber B
where the wood enters the machine, as well as be
intermediate the table ends and means at the
wood along the table, means supporting the wood
hind the cleaning chamber D, where the wood
other end thereof for delivering the wood, the
leaves the machine are arranged two mechani
35 cally driven feed rollers I6, the number of revo
lutions of which may be altered in accordance
with the time required to treat or char the wood,
a scale being provided for adjustment purposes.
Thus the degree or intensity of the burning or
brushes acting on the wood in the direction of the
40 charring operation most suitable for giving the
depth and tone for the different kinds of wood
2. Apparatus for producing a plastic varie
gated surface on wood comprising, in combina
tion, a table, a burning chamber mounted on
said table at one end, regulatable burners mount
ed in said chamber for charring wood, driven
rollers for feeding wood along the table, the
speed of said rollers being variable, a cooling
can be determined such as for white or red ?r
tree, larch or pine and so on. The upper part of ' chamber containing water mounted on the table
the chamber B is provided with a ?ue I‘! in order
45 that the combustion gases vmay’escape and the
upper part of the decarbonizing and cleaning
chamber is provided with a dome-shaped cover
l8 to which is connected a ?ue I9.
When applying the method by means of the
50 apparatus above described the burners I located
in the chamber B are ?rst lit. After the device
is set-going, the wood to be treated is introduced
between the two feed rollers IS. The wood then
passes through the burning zone I in which it is
65 subjected to a uniform heat, the in?uence of
which on the surface of the wood depends on the
speed at which the wood is fedalong and may be
regulated by varying the speed of rotation of the
feed rollers l6. After this burning process, the
wood reaches the cooling device C which cools the
in juxtaposition to said burning chamber, an 45
opening in the bottom of said cooling chamber,
absorbent material disposed in said opening con
ducting water to the wood thereunder, a decar
bonizing and cleaning chamber mounted on the
table in juxtaposition to said cooling chamber, 50
rotary abrasive brushes mounted in said clean
ing chamber, the bristles being formed of metal
strips, the bristles having equal spaced gaps and
a rotary polishing brush mounted in said clean
ing chamber, the bristles of said polishing brush 55
being constructed of strips of leather, equally
spaced gaps dividing said bristles into groups,
said brushes acting on the wood in the direction
of the grain.
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