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Патент USA US3020953

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Feb. 13, 1962
3 Sheets-Sheet 1
Filed June 5, 1958
32 3o
Feb. 13, 1962
Filed June 5, 1958
5 Sheets-Sheet 2
Fm. 2
____-l. ____
` By y
Feb. 13, 1962
Filed June 5, 1958
3 Sheets-Sheet 5
United States atent Or lo@
Patented Feb. 13, 1962
These objects have been achieved by a novel structure
wherein the barking irons are fastened rto the supporting
rings so solidly that the drum can operate at higher speeds
without causing increased maintenance costs. As a result,
lacob Johansson Hjärtsäter, Gjovikbanen, Norway, as
signor to Fibre Making Processes, Inc., Chicago, Ill., a
corporation of Illinois
Filed .lune 5, 1958, Ser. No. 740,053
Claims priority, application Norway .lune 18, 1957
6 Claims. (Cl. 1444-208)
the barking effect is enhanced.
Also, the connection
between the irons and the rings is so solid that some of
the wide channeled rings can be replaced by narrow
rings, thereby increasing the size of the openings through
which the bark can fall. The bark thus can fall through
This invention relates to improvements in barking 10 the openings instead of coming out the end of the drum
To remove the bark from pulpwood the pulpniaking
industry is using large revolving drums. Bark-covered
logs are fed into one end of the drum and discharged
at the other end with the bark removed. The barking is
principally a result of the friction between the logs caused
by the rotation of the drum, for there is not much bark
ing eitect between the logs and the drum in prior-art
The barking effect is comparatively small per unit length
with or knocked into the wood.
Another object is to obtain a free outlet for the bark
and to provide a novel bar shape that keeps the bars clean
of bark during the barking process.
Another object of the invention is to obtain a more
eifective bark removal. This improvement is obtained
from the action upon the logs of novel longitudinal
V-shaped bars which are mounted on the inside of the
barking drums separated from each other and serve as the
barking elements.
of the drum; so the barking drums are made large and
Another object is to provide a structure that absorbs
long, and their maintenance has been quite expensive.
the shocks and vibrations produced by operation of the
barking drum.
Some of these latter objects are achieved by providing
The turning over of the mass of logs causes vibrations
and shocks that are transmitted to the machinery, the
supporting frame, and their foundations. Moreover, the 25 a novel attachment of the barking elements to the drum
barking is more efficient when the drum rotates at a high
strengthening rings, by providing the elements themselves
speed, and at high speed the stresses become very large
with a comparatively flat cross section at their radially
because of the weights involved and the motion of heavy
inner extremity, usually called the top surface, and by
providing that surface with ridges or grooves extending
A major part of the maintenance concerns the fasten 30 the length of the bar, the ridges being shallow in relation
to the height of the bar itself. One or more of these
ings for the barking irons, which have been unable to
endure the huge strains caused by the tumbling of the
ridges may, in accordance with this invention, be shaped
mass of logs. Consequently, it has not been possible to
run the barking drums at the higher speeds which give
like blunt knife edges set in the direction of the rotation
of the drum. Or, also according to this invention, the
the best barking effect. The problem has been particu
larly severe when barking heavy wood.
top of one or more of these ridges may have grooves
with identical edges on each side.
Other objects and advantages of the invention will
appear from the following illustrative embodiments
spaced rings of wide channel shape, in order to get sup
In the drawings:
port that enables running at low or medium speeds with 40
Because of these difficulties, the barking irons have
heretofore been secured to a series of rather closely
out excessive maintenance costs.
But the maintenance
FIG. l is a view in end elevation of a barking drum
assembly embodying the principles of the present inven
problem has not been satisfactorily solved by this expedi
ent, and another problem has been created by it.
FIG. 2 is a view in side elevation of the drum assem
This other problem is that the rather close spacing of
the channeled rings lengthwise along the drum has drasti 45 bly of FIG. 1.
FIG. 3 is an enlarged view in side elevation of the
cally reduced the area of the openings between the bark
drum proper of FIGS. l and 2 showing the attachment
ing drums through which the removed bark can fall out.
of the bars to a series of supporting rings.
FIG. 4 is a fragmentary View similar to FIG. 3 of a
portion of a modiíied form of drum also embodying this
drum is open in a total length of 22 feet, 81/2 inches.
As a result of the relatively small areas that remain
FIG. 5 is an enlarged fragmentary view in section
open after installation of the supporting rings, not all the
along the line S--S in FIG. 3.
removed bark is able to fall out through the openings,
FIG. 6 is a further enlarged fragmentary view in sec
and substantial quantities of bark have often come out
the end along with the wood. There the bark has defiled 55 tion taken along the line 6--6 in FIGS. 3 and 7 and
For example, in an excellent drum embodying current
practice, only ll7" (9 feet, 9 inches) of the length of the
the paper made from the pulp.
Also, when the logs tumble inside such drums, the bark
gets pounded into the ends of the logs, and this bark is
practically impossible to remove even with waterjets.
This has long been considered a disadvantage of `drum 60
showing a preferred structure of barking element and
the support therefor.
FIG. 7 is a fragmentary view looking at FIG. 6 along
the arrow 7.
FIG. 8 is a view similar to FIG. 7 looking at another
point along the drum showing the use of narrow rings
which, according to this invention, can replace the wide
channels at some points along the drum.
of paper made therefrom.
FIGS. 9, l0, ll, and l2 are enlarged cross-sectional
An important object of this invention is to provide solid
support for and a strong connection between the barking 65 views of four different shapes of modiñed forms of bark
ing elements according to the invention.
elements or irons, which are longitudinal bars, and their
barkers, particularly with large units used at high speeds,
for the presence of bark lowers the quality of the pulp and
numerous supporting rings, so that the drum can safely
and economically rotate at higher speeds, with the re
sultant increases in the barking effect.
FIGS. 13 and 14 are views in section taken respectively
along the line 13-13 in FIG. 9 and lf3-14 in FIG. ll,
showing how the barking elements are fastened to the
Another important object is to provide the drum with 70 supporting rings.
FIG. l5 is a view in section taken along the line 15-15
in FIGS. 3 and 16.
lengthwise openings of large size between the longitudinal
bars and the supporting rings.
FIG. 16 is a view in section taken along the line
16--16 in FIG. 15.
In the barking rum assembly shown in FIGS. l and
2 a drum 1 is suspended by chains 2 which run over a
drive sprocket Wheel 3 and idler sprocket wheel 4. To
avoid vibration, the supporting frame may comprise in
dividual sections 5 supported on a base 6.
The lateral
position of the drum 1 is maintained by rollers 7.
U-shaped and comparatively wide and are used in suf»
ñcient number to make drum 1 rigid. The all-important
reinforcing of the connection between the bars ¿l0 and
the rings 12 is the plate element 63 (basically like the
plate element 23) arranged on one or both sides of the
rings 12 and filling out the inside hollow 64 of the
barking element 49. Moreover, the plate 63 is welded
both to the inside hollow 64 of the bar 40 and to the
drum 1 may be driven from a motor 8 mounted on the
side 65 of the ring 12.
frame 5, acting through gears 9 and 19.
The drum 1 comprises longitudinally extending bark
ing irons 11 supported by a series of channel rings 12
Longitudinal openings 68 between the bars 40 and rings
Welds 66 and 67 are shown.
and, according to this invention, also by some narrow
rings 30, which replace some of the channel rings 12
normally used. Preferably, the barking irons 11 corn
prise M-bars, as shown in FIGS. 1_8, with apexes 13
a solid support for bars 50 at points between the broad
rings 12. The plate rings 3i) take little room and so
help to provide large openings 35 shown in FIG. 3 that
and 14 of the M facing radially inwardly and with
fastening to the bars by plate elements 70 basically like
12 provide for the disposal of the removed bark.
FIG. 14 shows section of another ring 3U which gives
serve as bark outlets.
The ring 30 is well adapted for
the plate elements 26. The joint is very solid because
the plate element 7i) is welded at 71 in the hollow 72
rated by a flat central portion 18.
20 of the bar 50 and to the side of the plate ring 30. The
broad rings 12 can therefore be reduced in number.
FIGS. 6 and 7 show how this invention secures a lon
The rings 30 are also well adapted for bolting a sprocket
gitudinal M-bar 11 to a channel ring 12. In part this
ring or guide ring 73f for the rotation of the drum. A
is achieved by securing the barking iron 11 directly to
barking drum 1 employing these comparatively narrow
the channel rings 12 by longitudinal welds 19 as is cur
bars Si) fastened to plate rings 70 has much larger area
rent practice. But more important is Vthe reinforcement
of openings for bark outlet than previous known types.
of this by securing each M-bar to a plate 20 having a
pair of V-shaped projections'Zl and 22 that match and
In order to further increase the barking effect, the
barking irons o'r the ridges on them may also have
fit into the V-shaped recesses 15 and 16 and abut the'
V-shaped recesses 15 and 16 on their radially outer sur
faces 17. The two recesses and the apexes are sepa
outer surface 17, except for cut off ends 23 that assure
grooves, waves, corrugations, or other uneven surfaces,
contact along the edges. Welds 24 along the abutting 30 as seen in longitudinal section. To avoid brooming of
the logs, all surfaces of the barking elements may be
portions secure the plate 20 to the bar 11, and then
edges 2S are secured to side flanges 26 and 27 of the
channeled rings 12 by welds 2S.
The barking irons may, of course, have other shapes
lying within the scope of this invention. Thus, the irons
FIG. 8 shows a narrow ring 3G instead of a channel
ring 12. The ring 30 is fastened to the N'-bar 11 by 35 may have larger or smaller ridges or grooves and be of
plate elements 20 welded to the sides of the plate ring
oval, prismatic, or other suitable cross section. Also,
the drum may also be suspended eccentrically such that
the center of gravity is off center. In this case the drum
would be supported by guide wheels 7 on only one side.
The capacity of the drum 1 may be increased by di
conventionally used channel rings 12 is shown in FIGS. 40
viding the drum into several comparatively short sections
3 and 4. In FIG. 3 the area of the openings 35 through
which can be rotated at different speeds.
which the bark can fall out has been increased byabou‘t»
FIGS. l5 and 16 show the application of the inven
31% over the prior-art structure solely by replacement
tion to a drum having a'removable end piece. The M
of four of the channel rings 12 with narrow rings 30.
In the FIG. 4 structure the openings 35 have been in 45 bars are secured to plate elements 29 as before. The
plate elements 20 are secured to a large fixed end ring
creased in area by about 31% by using these narrow
rings 30.
80 by welds 81, and the fixed end ring 80 is secured to a
removable end ring by countersunk rivets 83. When the
In addition, the strength of the drum 1 and the solidity
end ring 32 becomes worn by the logs, it can be re
of the support for the irons 11. is greatly increased by
use of the plates 20 and by welding them to the inside 50 moved by knocking out the rivets 83 and putting in a
new ring S2.
hollows 15 and 16 of the M-bar 11 as well as to the
rings 12 or 30.
To those skilled in the art to which this invention re
30hy welds 31 and also to the inside hollows 15 and
16 of the M-bar 11 by the welds 24.
Use of the several rings 30 in` place of some of the
with the logs is provided with a number ofl comparatively
small ridges 42. When the drum 1 rotates, the ridges
lates, many changes in construction and widely differing
embodiments and applications of the invention will sug
gest themselves without departing from the spirit and
scope of the invention. The disclosures and the descrip
42 serve to rub bark off the logs.
tion herein are purely illustrative and are not intended to
In an alternative from of barking element 40, shownV
in FIG. 9, the top surface 41 which comes in contact
For promoting the
be in any sense limiting.
I claim:
round shoulders 43.
l. In a rotary barking drum providing a log receiving
In the modified form of barking element 45 shown in 60
chamber and comprising a plurality of circular rings the
FIG. 10, ridges 46 are shaped as sharp teeth 47 directed
side walls of which are disposed in a longitudinal spaced
with the rotation of the drum 1.
arrangement about the axis of said drum, and an annular
In the modification shown in FIG. 11 a bar 50 ispro
agitation of the log pile, the bars 49 are shaped with
vided with one or more somewhat larger ridges 51.
Between these ridges 51 on the top is a groove 52 such
that identical ridges 51 are on oppositev sides of the
groove 52.
FIG. 12 shows a V-shaped barking element 55 pro
vided on top with ridges 56 and groove 57.
Referring to FIG. 13, the longitudinal barking irons
40 are fastened to channel rings 12in a manner basically
similar to the structure shown in FIGS. 6~8. One side
60 of the bars 40 is welded at 61 to one side 62 of the
series of elongated circumferentially spaced barking irons
extending normal to the sides of said rings and adjacent
the inner periphery thereof within said chamber, the irn
provement comprising each of said barking irons having
cooperating walls converging inwardly of said chamber
from said rings and providing therebetween outwardly
70 facing recesses on one side of said cooperating walls and
a barking surface on the opposite side thereof facing said
chamber, relatively flat plates having portions connect
ing and reinforcing said irons from said rings, one of said
portions having an elongated outer edge and side lying
ring 12 across the whole width. The rings `12.-areV 75 ñush against a side wall ofen-associated-ring-and-tbeing`
welded thereto, and another of said portions having con
verging inner edges extending into said recesses in said
irons and being welded to the corresponding converging
walls thereof, whereby to provide a circumferentially re
enforced functionally integral drum structure for the pur
pose intended.
2. The drum of claim 1 in which some of said rings
are wide channel-shaped members with radially outwardly
extending ilanges while other of said rings are of simple
bar construction, said other rings being much narrower
than said channel-shaped members and being spaced be
tween successive said channel-shaped members for impart
ing additional strength to said drum without consuming
side said rings, each iron being substantially M-shaped in
cross section with the apexes of the M’s facing radially
inwardly and the legs facing radially outwardly, to pro
vide a pair of V-shaped recesses between converging walls
on the outer surface of said irons, the bases of the legs
being secured to said rings by longitudinally extending
welds; and reinforcing and securing plates each having a
pair of generally V-shaped projections extending into said
V-shaped recesses, inner portions of side edges of said
projections being welded to both of said converging walls
of said outer surfaces, each plate having an outwardly
extending portion with a side surface abutting a side
wall of said ring and with the outer portions of said side
edges and an outer edge joining said side edges all being
excessive space.
3. The structure recited in claim l in which said bark 15 welded to said side wall.
ing surface on the opposite side of said irons and facing
References Cited in the file of this patent
said chamber is formed with longitudinally extending
ridges thereon.
4. The structure as recited in claim 1 in which edges
Candy ________________ __ Feb. 8, 1932
of said cooperating converging walls of said irons are 20
Mertz et a1. __________ _.. Apr. 8, 1952
welded to inner peripheral portions of said rings.
Waller ______________ __ Sept. 7, 1954
5. The structure as recited in claim 4, and in which
said barking surface comprises circumferential spaced
barking ridges.
6. A barking drum comprising: a plurality of circular 25
supporting rings spaced longitudinally from each other
and having side walls each lying in radial planes; a plu
rality of longitudinally extending barking irons spaced
circumferentially from each other and lying radially in
Hanson ______________ __ Aug. 4, 1959
Norway ______________ __ Apr. 11,
Norway ______________ __ Aug. 27,
Sweden ______________ _- May 26,
Norway ______________ __ May 24,
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