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Dec. 31, 1946.
F, H, swlFT
2,413,341
HYDRAULIC BARKER FOR SLABS
Filed June 2, 1944
s Sheets-Sheet 1
IN VEN TOR.
FRANK H.SWlFT
BY
%,
Dec. 31, 1946.
2,413,341
F. H. SWIFT
HYDRAULIC BARKER FOR SLABS
Filed ‘June 2, 1944.
3 Sheets-Sheet 2
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________
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I
I
INVEN TOR.
BY .FRANK H. SWIFT
W and
_
‘
.
Dec. 31, 1946.
F, [-|_ swlFT
'
2,413,341
HYDRAULIC BARKER FOR SLABS
Filed June 2, 1944
Q
3 Sheets-Sheet S
1.
WW'FPWWWIF
'
INVENTOR.
FRANK H. SWIFT
‘BY Wham
W7A~
Patented Dec. 31, 1946
2,413,341
STATES PATENT OFFICE
2,413,341
HYDRAULIC BARKER FOR SLABS
Frank H. Swift, Portland, 0reg., assignor to
Crown Zellerbach Corporation, San Francisco,
Calif., a corporation of Nevada
Application June 2, 1944, Serial No. 538,360
9 Claims. (Cl. 144-208)
1
2
This invention relates to the removal of bark
from slabs and from similar saw mill waste.
and are supported in between on tracks I4 and I 5
at top and bottom respectively. Suitable cooper
ating means are provided by the chains and by
the upper and lower tracks in order to keep the
Heretofore a considerable amount of such ma
terial has not been employed for any purpose
other than fuel. While portions of such saw
mill waste from time to time have been used for
making wood pulp, the necessary removal of bark
from the slabs has proved so expensive and
chains from slipping sideways off the tracks.
The sprocket wheels I3 at the forward end of the
barker, are mechanically driven by means of a
sprocket chain drive I6 connected with a power
wasteful, when done by mechanical means, that
transmission I‘! which, in turn is connected with
the use of such slabs and mill waste for wood pulp 10 a motor drive (not shown) for the entire barker.
has, in general, been considered impractical and
A hydraulic debarking nozzle I8 is secured to
the bottom end of the pipe I9 and the pipe I9 is
The object of this invention is to provide a
suspended from and connected to the delivery
simple, practical and economical means for re
pipe line 20 by a suitable universal joint so as to
moving bark from slabs and the like in order to 15 enable the lower end of the pipe I9 to swing in
enable such mill waste to be utilized pro?tably
any direction and at the same time permitting
for wood pulp.
waterunder pressure from the delivery pipe 20 to
A further object of this invention is to provide
pass into the pipe I9 and thus be delivered to
the debarking nozzle I 8.
a slab barker in which hydraulic means, in place
Swinging motion is imparted to the pipe I9 and
of mechanical means, will be employed for re 20
moving the bark so as to eliminate the excessive
nozzle I8 through the medium of an arm 2| (Figs.
waste of material incurred when the customary
1 and 3), one end of which is connected to the
mechanical means is employed and also to re
nozzle through a ball-and-socket joint 22 and
duce the labor cost necessitated by the use of
the other end of which is connected by a similar
mechanical debarking means.
25 ball-and-socket joint 23 to a cross head 24 which
An additional object of this invention is to
is carried by and joins a pair of identical, par
construct a hydraulic barker which is speci?cally
allelly-mounted sprocket chains 25 and 26. The
unpro?table.
adapted and designed for the debarking of slabs,
which will be easy to install and maintain and
which will require a minimum amount of labor in
its operation.
30
The manner in which the above mentioned ob
jects and other advantages are obtained, and
the construction and method of operation of my
barker will be explained hereafter briefly with
reference to the accompanying drawings.
In the drawings:
Fig. 1 is a plan view of the barker;
Fig. 2 is a side elevation;
Fig. 3 is a vertical transverse section taken on
the line 3-3 of Figs. 1 and 2; and
Fig. 4 is a fragmentary view showing in sec
tion a pair of the discs and spacer, which discs
help hold the slabs in place during the debarking.
The slabs II) are moved through the barker by
suitable endless conveyor chains or belts I I which
may be provided with lugs or spurs or any other
means for engaging the slabs. As shown in Figs.
1 and 3, the chains run parallel with each other
and are set fairly close together so that even
narrow slabs and slabs with V-shaped sawed sur- '
faces can be accommodated and will be held in
position so that their surfaces from which the
bark is to be removed will be held uppermost.
The conveyor chains pass over sprocket wheels
or pulleys I2 and I3 at the ends of the barker ’
sprocket chains 25 and 26 are mounted on
sprocket Wheels as shown in Fig. 1 and are driven
in unison from the main drive shaft 28 through
the intermediary of a pair of drive chains 29 and
30, which impart rotation to the stub shafts SI
and 32 respectively. The drive shaft 28 is driven
by the motor (not shown) operating the entire
barker. The power transmission I1 is connected
to the drive shaft 28 by the sprocket chain 21.
It will be apparent that if the debarking noz
zle I8, when reciprocated back and forth across
the path of travel of the slabs by the arm 2|, is
moved in a line exactly normal to the line of
travel of the slabs and while the slabs are mov
ing, the result would be the removal of the bark
in oblique, zig-zag paths across the slabs unless
the forward‘movement of the slabs were made
intermittent. In order to overcome this di?i
culty and in order to enable the slabs to be moved
forward through the barker at a constant rate
of speed, and ‘thus avoid the necessity of provid
ing for intermittent or interrupted travel of the
slabs, I have provided a special means by which
the nozzle will be caused to travel obliquely
across the slabs while the slabs are in motion, the
direction of travel of the nozzle being so ar
ranged, with respect to the forward direction of
travel of the slabs, that the resultant of the two
directions in which the nozzle is moved will form
2,413,341
4
3
pipe 6| extending transversely above the de
a path across the moving slabs exactly normal
to their line of travel. This results in the re
moval of the bark in adjacent parallel paths from
barked slabs in the location shown in Figs. 1
and 2.
the top exposed slab surfaces.
The means by which this is accomplished in
As a further means of holding the slabs in
place on the conveyor chains I provide two rows
of discs 62 adapted to ride on the top of the slabs
cludes a guideway 33 movable in a horizontal
plane, which guideway consists of a pair of par
allel rods supported at each end in a pair of
sliding end plates 34. The end plates 34 are slid
ably mounted in bifurcated supporting members 10
and thus prevent any tendency of the slabs to
bounce oil of the conveyor chains when sub
jected to the force of the jet from the nozzle.
35 secured to the top frame of the barker.
versely extending bar 63, and suitable spacers
A
Each row of such discs 62 is mounted on a trans
64 are supported on the bar and arranged alter
chain 36, connected to the end plates 34 at one
nately with the discs 62 in order to keep the discs
side, passes around the pulleys 3'! and 38 mounted
from sliding sideways. The discs 62 have en
at ?xed points in the top of the barker. On
the opposite side the two short lengths of chain 15 larged circular cut out portions of considerably
greater diameter than the supporting bar 63 so
39 and 40, connected to the end plates of the
guideway respectively, pass around similar pul
as to permit the discs to move up and down and
thus rest on the top of the slabs even though
leys, and are connected to the extremities of
a reciprocating rod 4| actuated by a piston in
the slabs are of various shapes and sizes. See
the compressed air cylinder 42. A pair of pipes 20 also Fig. 4.
The operation of my slab barker is a very sim
43 and 44 are connected to opposite ends of the
air cylinder 42, and, by acting alternately as
ple matter. The slabs are placed on the con
delivery and exhaust ports, produce reciprocation
veyor chains at the left hand end of the machine
of the rod 4|. Fig. 1 shows the reciprocating
(as viewed in Figs. 1 and 2) and, after having
rod 4| at the end of its travel in one direction 25 the bark removed, leave the machine at the right
and the resulting positioning of the guideway
hand end. Since the forward movement of the
slabs is constant and is synchronized with the
33. It will be apparent that the movement of the
rod 4| to its limit in the opposite direction will
reciprocal movement of the debarking nozzle,
cause the position of the guideway 33 to be re
and since the reciprocal movement of the noz
versed with respect to a line normal to the line 30 zle in turn automatically produces the necessary
adjustment of guideway 33 so as to cause the
of travel of the slabs. The pipe |9 extends
through a block 45 which is slidable in the guide
jet from the nozzle to follow parallel adjacent
paths transversely across the top of the slabs,
way 33.
Delivery of air automatically through the pipes
no further control of the debarking operation
43 and 44 to the air cylinder 42 takes place 35 is necessary while the slabs are in the machine.
The fact that the arm 2|, producing the recip
through a control valve 46 which is connected
by a pipe 41 to a source of compressed air and
rocal movement of the debarking nozzle, is actu
which also has a port 48 exhausting to the atmos
ated by the parallel endless chains 25 and 26,
phere. The control valve 46 is operated by a
is a considerable advantage since this arrange
lever 49. A bar 50 is connected to the lever 40 ment prevents undue shock or jarring when the
49 by a ball-and-socket joint and the other end
nozzle reaches the end of its stroke and its move
of the bar 50 is similarly connected to the pipe
ment is reversed, and this construction enables
rapid reciprocal movement to be imparted to the
l9. Thus the swinging of the pipe l9 and the
nozzle through a simple and compact mecha
nozzle |8 to one extreme position causes the valve
46 to be operated to connect one of the pipes 45 nism.
Due to the simplicity of construction and the
43 or 44 to the supply pipe 41 and the other pipe
relatively small size of my slab barker my device
to be connected to the exhaust outlet 48, and
the swinging of pipe l9 and nozzle |8 to the
can be set up .in any desired location Wherever
an adequate water suppply is available, and thus
other extreme position reverses the connections
50 it can be conveniently set up in an ordinary saw
to the pipes 43 and 44.
Since the force of the jet from the debarking
mill so that slabs can be debarked as they are
nozzle |8 causes the bark on the upper surface of
discarded from the mill.
the slabs to be splintered into small fragments
Modi?cations could be made in the construc
tion of the different parts of my slab barker
and these to be scattered in all directions, I pro
vide a housing over the barker. This housing
within the scope of my invention and such modi
includes a pair of upright walls 5| and 52 (Fig.
?cations are intended to be included in the ele
2), side extensions 53 and 54 joined to the bot
ments of the claims. However, I consider the
construction illustrated to be practical and desir
tom of the upper walls 5| and 52 respectively, top
able, particularly because of its simplicity and the
plates 55 and 56, upright extensions 51 and 58
connected to the top plates 55 and 56 respec
ei?cient manner in which the bark can be re
moved from the slabs of various sizes and shapes.
tively, flaps 59 of rubber or other similar ?ex
ible material, the free bottom ends of which
I claim:
?aps bear against the tops of the slabs, and a
1. In a slab barker, means for moving the slabs
pair of similar ?aps 60 designed to keep the open
ing around the swinging pipe I!) closed.
A shield 80, having sloping top surfaces, is
placed below the top tracks for the conveyor
65
longitudinally through the barker, a hydraulic
debarking nozzle, said nozzle positioned above
a suitable receptacle or other collecting means
said slab moving means and adapted to discharge
a debarking jet downwardly on the slabs, means
for delivering water under pressure to said noz
zle, means for moving said nozzle back and forth
across the path of said slabs, a movably mounted
guideway, said nozzle slidably attached to said
(not shown).
guideway and arranged so as to move along said
In order to remove from the debarked slabs
any bark splinters which may remain thereon or
guideway causing said guideway to direct the
become deposited thereon, I provide a shower
ment, ‘said guideway mounted to swing in a plane
chains beneath the nozzle path in order to de
?ect the bark splinters which drop from the
slabs down below the sides of the barker and into
course of said nozzle in its back and forth move
2,413,341
5
6
parallel to the plane in which said slabs move,‘
mechanism attached to said guideway for posi
tioning said guideway obliquely with respect to
from said pipe line by a universal joint so as to
permit the lower end of said pipe and the con
nected nozzle to be swung in any desired direc
the line of movement of the slabs and for alter
tion, an arm having one end connected to said
nating said oblique position at each reversal of
nozzle, mechanism connected to the other end of
movement of said nozzle, and a control for said
mechanism connected with said nozzle.
2. In a slab barker, conveyor chains for mov
posite directions, said arm and mechanism acting
said arm for moving said arm alternately in op
to move said nozzle back and forth across the
path of said slabs, a movably mounted guideway,
ing the slabs longitudinally through the barker,
a hydraulic debarking nozzle, said nozzle posi 10 said nozzle slidably attached to said guideway and
arranged so as to move along said guideway caus
tioned above said conveyor chains and adapted
to discharge a debarking jet downwardly on the
slabs, a delivery pipe connected to said nozzle,
means for swinging said pipe and nozzle back
and forth across the path of said slabs, said 15
ing said guideway to direct the course of said
nozzle in its back and forth swing, said guideway
mounted to swing in a plane parallel to the plane
in which said slabs move, means for positioning
means including an arm having one end con
said guideway obliquely with respect to the line
of movement of the slabs and for alternating the
position of said guideway at each reversal of
the other end of said arm for moving said arm
movement of said nozzle, an air cylinder included
alternately in opposite directions, a movably
mounted guideway, said nozzle slidably attached 20 in said latter mentioned means, a reciprocating
nected to said nozzle, mechanism connected to
to said guideway and arranged so as to move
piston operated by said air cylinder, said piston
along said guideway causing said guideway to
connected to said guideway so as to move said
direct the course of said nozzle in its back and
guideway into said alternate oblique positions in
‘forth swing, said guideway mounted to swing in
said plane, a control for said latter mentioned
means connected with said pipe and nozzle, and a
main power drive for said barker, said slab mov
a plane parallel to the plane in which said slabs
move, means for positioning said guideway
ing means and said mechanism operated from
said main power drive.
5. In a slab barker of the character described,
guideway at each reversal of movement of said
nozzle, an air cylinder included in said latter 30 conveyor chains for moving the slabs longitudi
nally through the barker, a hydraulic debarking
mentioned means, a reciprocating piston oper
obliquely with respect to the line of movement of
the slabs and for alternating the position of said
ated by said air cylinder, said piston connected
to said guideway so as to move said guideway
nozzle, said nozzle positioned above said conveyor
chains and adapted to discharge a debarking jet
downwardly on the slabs, means for delivering
into said alternate oblique positions in said plane,
a control for the delivery of air into said cylin
der connected with said pipe and nozzle, and a
main power drive for said barker, said conveyor
chains and said mechanism operated from said
ing one end connected to said nozzle, mechanism
connected to the other end of said arm for mov
ing said arm alternately in opposite directions,
main power drive.
said arm and mechanism acting to move said
Water under pressure to said nozzle, an arm hav
3. In a slab barker of the character described, 40 nozzle back and forth across the path of said
slabs, guiding means, said nozzle slidably at
conveyor chains for moving the slab longitudi
nally through the barker, a hydraulic debarking
nozzle, said nozzle positioned above said conveyor
chains and adapted to discharge a debarking jet
tached to said guiding means and arranged so
as to move along said guiding means causing said
guiding means to direct the course of said nozzle
downwardly on the slabs, means for delivering
in its back and forth movement, said guiding
water under pressure to said nozzle, an arm hav
ing one end connected to said nozzle, said arm
acting to move said nozzle back and forth across
means mounted to swing in a plane parallel to
the plane in which said slabs move, mechanism
attached to said guiding means for positioning
said guiding means obliquely with respect to the
line of movement of the slabs and for alternat
the path of said slabs, a pair of parallelly-mount
ed chains driven in unison, a cross member con
nected to said chains, said arm connected to said
cross member, guiding means, said nozzle slidably
attached to said guiding means and arranged so
as to move along said guiding means‘causing
said guiding means to direct the course of said
nozzle in its back and forth movement, said guid
ing means mounted to swing in a plane parallel
ing the position of said guiding means at each
reversal of movement of said nozzle, an air cylin
der included in said latter mentioned mechanism,
a reciprocating piston operated by said air cylin
der, said piston connected to said guiding means
so as to move said guiding means into said alter
nate oblique positions in said plane, a, control
for the delivery of air into said cylinder con
to the plane in which said slabs move, mech
nected with said pipe and nozzle, and a main
anism attached to said guiding means for posi
tioning said guiding means obliquely with respect (ll power drive for said barker, said conveyor chains
and said ?rst‘ mentioned mechanism operated
to the line of movement of the slabs and for alter
from said main power drive.
nating the position of said guiding means at each
6. A slab barker of the character described in
reversal of movement of said nozzle, a control
cluding means for moving the slabs longitudinally
for said mechanism connected ‘with said nozzle,
and a main power drive for said barker, said con 65 through the barker, a hydraulic debarking noz
zle, said nozzle positioned above said slab mov
veyor chains and said pair of parallelly-mounted
ing means and adapted to discharge a debarking
chains operated from said main power drive.
jet downwardly on the slabs, a delivery pipe con
4. In a slab barker of the character described,
nected to said nozzle, a supply pipe line con
means for moving the slabs longitudinally
nected to said delivery pipe, said delivery pipe
through the barker, a hydraulic debarking nozzle,
said nozzle positioned above said slab moving
connected to said pipe line by a universal joint
means and adapted to discharge a debarking jet
'50 as to permit the lower end of said pipe and
downwardly on the slabs, a delivery pipe con
the connected nozzle to be swung in any desired
nected to said nozzle, a supply pipe line connected
direction, means connected to said pipe for swing
to said delivery pipe, said delivery pipe suspended
ing said pipe and nozzle back and forth across
2,413,341
7
the path of said slabs, a movably mounted guide
way, said nozzle slidably attached to said guide
8
to said nozzle, an arm having one end connected
to said nozzle, mechanism connected to the other
end of said arm for moving said arm alternately
in opposite directions, a movably mounted guide
way causing said guideway to direct the course
of said nozzle in its back and forth swing, said 5 way, said nozzle slidably attached to said guide
way and arranged so as to move along said guide
guideway mounted to swing in a plane parallel
way causing said guideway to direct the course of
to the plane in which said slabs move, means for
positioning said guideway obliquely with respect
said nozzle in it's back and forth swing, said guide
way mounted to swing in a plane parallel to the
to the line of movement of the slabs and for alter
way and arranged so as to move along said guide—
nating the position of said guideway at each re
versal of movement of said nozzle, an air cylin
der included in said latter mentioned means, a
reciprocating piston operated by said air cylinder,
said piston connected to said guideway so as to
move said guideway into said alternate oblique
positions in said plane, a control for the delivery
of air into said cylinder connected with said pipe
10 plane in which said slabs move, means for posi
tioning said guideway obliquely with respect to
the line of movement of the slabs and for alter
nating the position of said guideway at each re
versal of movement of said nozzle, an air cylinder
included in said latter mentioned means, a re
ciprocating piston operated by said air cylinder,
said piston connected to said guideway so as to
move said guideway into said alternate oblique
positions in said plane, a control for the delivery
for swinging said pipe and nozzle operated from 20 of air into said cylinder connected with said pipe
and nozzle, a main power drive for said barker,
said main power drive.
said slab moving means and ‘said mechanism op
'7. A slab barker of the character described in
erated from said main power drive, and a plural
cluding conveyor chains for moving the slabs 1on
ity of discs adapted to rest on said slabs during
gitudinally through the barker, a hydraulic de
and nozzle, and a main power drive for said
barker, said slab moving means and said means
barking nozzle, said nozzle positioned above said
the barking operation to keep said slabs in place
conveyor chains and adapted to discharge a de
barking jet downwardly on the slabs, a delivery
pipe connected to said nozzle, a supply pipe line
on said slab moving means.
so as to permit the lower end of said pipe and the
connected nozzle to be swung in any desired di
rection, means for swinging said pipe and nozzle
back and forth across the path of said slabs, said
ed to discharge a debarking jet downwardly on
the slabs, a delivery pipe connected to said nozzle,
a supply pipe line connected to said delivery pipe,
said delivery pipe suspended from said pipe line
means including an arm having one end con
by a universal joint so as to permit the lower end
of said pipe and the connected nozzle to be swung
in any desired direction, an arm having one end
9. A slab barker comprising conveyor chains
for moving the slabs longitudinally through the
barker, a hydraulic debarking nozzle, said nozzle
connected to said delivery pipe, said delivery pipe
suspended from said pipe line by a universal joint 30 positioned above said conveyor chains and adapt
nected to said nozzle, a pair of parallelly-mo-unt
ed chains driven in unison, a cross member con
nected to said chains, said arm connected to said
cross member, guiding means, said nozzle slidably
attached to said guiding means and arranged to
move along said guiding means causing said guid
ing means to direct the course of said nozzle in
its back and forth swing, said guiding means
mounted to swing in a plane parallel to the plane
in which said slabs move, mechanism attached to
said guiding means for positioning said guiding
means obliquely with respect to the line of move
ment of the slabs and for alternating the posi
tion of said guiding means at each reversal of
movement of said nozzle, a control for said mech
anism connected with said pipe and nozzle, a main
power drive for said barker, said conveyor chains
and said pair of parallelly-mounted chains op
erated from said main power drive, and a housing
shield for restricting the scattering of bark frag
ments during the debarking operation.
8. A slab barker comprising means for moving
the slabs longitudinally through the barker, a
connected to said nozzle, a pair of parallelly
mounted chains driven in unison, a cross member
connected to said chains, said arm connected to
said cross member, a movably mounted guideway,
said nozzle slidably attached to said guideway
and arranged so as to move along said guideway
causing said guideway to direct the course of said
nozzle in its back and forth swing, said guideway
mounted to swing in a plane parallel to the plane
in which saidslabs move, mechanism attached to
‘said guideway for positioning said guideway
obliquely with respect to the line of movement
of the slabs and for alternating the position of
said guideway at each reversal of movement of
said nozzle, a control for said mechanism con
nected with said pipe and nozzle, a main power
drive for said barker, said conveyor chains and
said pair of parallelly-mounted chains operated
from said main power drive, a plurality of discs
adapted to rest on said slabs during the barking
operation to keep said slabs in place on said con
hydraulic debarking nozzle, said nozzle positioned
veyor chains, and a shower for washing bark
above said slab moving means and adapted to 60 fragments from the slabs after the debarking op
discharge a debarking jet downwardly on the
eration.
slabs, means for delivering water under pressure
FRANK H. SWIFT’
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