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Патент USA US3047047

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July 31, 1962
c, .w_ MULLls, 5R
3,047,035
LOG~DEBARKING MACHINES
Filed July 6, 1960
2 Sheets-Sheet 1
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INVENTOR
Cmzx. W. MuLL\s,Sla.
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A‘TTOIZHEY
July 31, 1962
3,047,035
c. w. MULLIS, sR
LOG-DEBARKING MACHINES
Filed July 6, 1960
1526.3
2 Sheets-Sheet 2
INVENTOR.
CARL. W MuLus, S2.
Uited rates
"ie
3,047,035
Patented July 31, 1962
1
2
3,047,035
has one end pivotally connected to the piston, as at 18,
and its opposite end pivotally connected, as at 19, to a
lever 20 in compartment 8. The bottom of the piston has
LOG-DEBARKING MAC
Carl Wilson Mullis, Sr., R0. Box 470, Lancaster, S.C.
Filed July 6, 1960, Ser. No. 41,075
6 Claims. (Cl. 144-208)
This invention relates to improvements in rotary de
barker machines and more particularly to improvements
in the machine disclosed in my prior Patent No. 2,908,302
a sealing ring 21 mounted thereon having sealing engage
ment with the wall of the cylinder and sealing plate 22
covers the inner end of the cylinder. Both the sealing
ring 21 and sealing plate 22 have central slots for passage
of the connecting rod 17. The lever 20 extends through
an opening 23 in the inner wall 24 of compartment 8 and
10 is integrally connected to a bearing 25 formed integral
issued October 13, 1959.
with the outer end of the askew-shaped skinner arms 26.
The primary object of the invention is to provide a de
The hearing 25 is journaled on shaft 27 supported by
barking machine having a rotary tank provided with a
brackets 28 attached to the side walls of the tank by
plurality of pivoted skinner arms movable into engage
bolts 28'. The skinner arms 26 are provided with a suit
ment with a log passing through the center of the tank
wherein the arms are actuated by pistons under constant 15 able skirming tool 29, such as a bead or the like on their
inner ends for removing the bark from a log as the log
?uid pressure within the tank, the pistons being disposed
moves through the center 'of the tank. The pistons 15 are
to reciprocate at right angles to the radius of the tank to
reciprocated by the constant ?uid pressure in compart
eliminate the drag of centrifugal force on the pistons upon
ments 7 to move the levers 20 and thus swing the skinner
rotation of the tank.
arms 26 towards the center of the tank into engagement
A further object of the invention is to provide a rotary
with the log. Movement of the lever 20 and piston 15 is
debarker having an annular tank divided into a series of
limited by a spring loaded stop 30 mounted on a bracket
?uid pressure compartments and a series of askew-shaped
31 in compartment 8.
.
skinner arms pivotally mounted on the inner periphery of
The tank 5 is mounted for rotation in the frame 32
the tank having connection with pistons within and re
sponsive to the ?uid pressure in said compartments, said 25 of the machine by hearing rings 33 and 34 attached to
pistons being disposed at right angles to the radius of the
tank thereby eliminating the drag of centrifugal force on
the pistons and counter-acting the centrifugal force on the
skinner arms when the tank is rotated.
A still further object of the invention resides in pro
viding a stator bearing ring and rotor bearing ring to ro
the frame and to the side walls of the tank, which rings
are formed of meehanite or other low friction metal. One
of the rings is formed with an annular tongue 35 having
inter?tting engagement with an annular groove 36 for-med
in the other ring. As shown in FIG. 4 the ring attached
to the Wall of the tank is secured in place by nuts and
bolts 37 and 38. Thus, the load supported by the bearing
tatably support the tank for rotation, said rings having an
rings is equally distributed around the entire circumfer
inter?tting tongue and groove connection to equally dis
ence of the rings. The tank is rotated by any suitable
tribute the weight of the tank around the entire circum
35 means such as a drive belt 39 trained around the outer pe
ference of the bearing rings.
riphery of the tank which is driven by a pulley 40 mounted
A still further object of the invention resides in provid
ing an annular tank divided into ?uid pressure compart
ments having pistons mounted therein at right angles to
the radius of the tank responsive to the ?uid pressure in
said compartments, and intermediate compartments for
mounting the skinner arms and connecting levers between
the skinner arms and pistons, said intermediate compart
ments being free of ?uid pressure.
Other objects and advantages of the invention will be
on a drive shaft 41.
in operation, a suitable feeding mechanism moves the
logs axially through ‘the center of the tank 5 while the
tank is rotated in a clockwise direction. When the end
of a log abuts the askew-s'naped skinner arms ‘26 they are
spread outwardly by the pressure of the log against the
arms allowing the log to pass between the arms. The
?uid pressure in the compartments 7 exerts a constant
45 pressure on the pistons 15 which through the connecting
apparent during the course of the following description.
rods 17 and levers 2t) swings the skinning arms 26 towards
In the accompanying drawings forming a part of this
the axis of the tank and thus maintains the skinner tools
speci?cation and in which like numerals are employed to
29 in bark removing engagement with the logs. The cen
designate like parts throughout the same,
FIG. 1 is a side elevational view of the annular tank of
a rotary debarking machine, partly in section,
trifugal force on the skinner arms 26 created by the ro
50 tation of the tank is counter-acted by positioning the cylin
ders 12 and pistons 15 at right angles to the radius of the
tank whereby the centrifugal force on the pistons and
connecting rods counterbalances the centrifugal force im
parted to the skinner arms. The tank is rotatably sup
nular metal tank which is divided by transverse partitions 55 ported by rotor and stator rings 33 and 34 having a tongue
and groove connection which supports the radial and
6 into a series of compartments 7 and 8 arranged in alter
thrust load equally around the circumference of the tank.
nate relation. The compartments 7 are adapted to receive
It is to be understood that the form of the invention
and hold a compressed ?uid such as air, gas or the like
herein shown and described is a preferred example of the
and communication is established between the compart
ments by conduits 9 extending between the openings 10 60 same and changes in the shape, size and ‘arrangement of
the parts may ‘be made without departing from the spirit
in the side walls 11 of the compartments. As more
of the invention.
clearly shown in FIG. 3, a cylinder 12 is mounted in each
Having thus described my invention, I claim:
of the compartments 7 with one end of the cylinder in
1. in a log-skinning machine, an annular tank divided
open communication with the compartment and the other
end extending through the partition at one end of the 65 transversely into a series of compartments with alternate
compartments containing ?uid under pressure, means
compartment and secured thereto by 'bolts 13 extending
establishing communication between said alternate com
through the ?ange 14 surrounding the end of the cylinder.
partments to equalize the pressure in said compartments,
Thus, it is seen the cylinders are mounted in the compart
cylinders mounted in said alternate compartments in open
ments 7 at right angles to the radius of the tank. A piston
15 is slidably mounted in the cylinder having a sealing ring 70 communication with said compartments and at right an
gles to the radius of said tank, pistons slidably mounted
16 attached to the head of the piston for sealing engage
in said cylinders, a series of askew-shaped skinner arms
ment with the wall of the cylinder. A connecting rod 17
FIG. 2 is a cross section taken on line 2-2 of FIG. 1,
FIG. 3 is a section taken on line 3——3 of FIG. 2, and
FIG. 4 is a cross section taken on line H of FIG. 3.
Referring to the drawing, the numeral 5 denotes an an
3,047,035
3
pivotally mounted on the inner periphery of said tank for
swinging movement towards the axis of said tank, means
connecting said arms withf'said pistons, and means fo
rotating saidtank.
'
4 .
end wall'of said alternate compartments at right angles
to the radius’ of said tank, pistons mounted in said cyliril, 7'
ders under constant ?uid pressure, a plurality of skinner
arms pivotally mounted aroundthe inner periphery of
2. In a log-skinning machine, an annular tank divided
transversely into a series of compartments with alternate
compartments containing ?uid under pressure, means
establishing communication between said alternate com
said tank, means within the intermediate compartments '7
riphery of said tank for swinging movement towards the
center of said tank, levers extending from said arms into
partment, pistons slidably mounted in said cylinders,
of said tank connecting said pistons with said skinner arms
for moving the arms towards the center of said tank,
stator bearing rings mounted on said frame, rotor bearing
partments to equalize the pressure'in said compartments,
rings carried by the side Walls of said tank having inter
7 ‘pistons mounted to reciprocate in said alternate compart 10 ?tting rotating connection with said stator rings, ~ and
ments, a series of skinner arms pivotally mounted around
means for rotating said ‘tank.
.
the inner periphery of said tank, means connecting said
5. In a log-skinning machine, an annular tank having a
skinner arms to said pistons ‘to swing the skinner arms to—
central passagefor axial movement of logs therethrough,
wards the center of said tank, and means for rotating said
said tank being divided by transverse partitions into a
tank.
.
15 series of compartments with alternate compartments con
3. In a log-skinningmachine, an annular tank divided
nected together and containing ?uid under pressure, askew-_
into a series of compartments, with alternate compart
shaped arms pivotally mounted in the intermediate com-,
. ments containing a ?uid under pressure, means establish
partments for swinging movement towards and from the
ing communication between said alternate compartments
axis of said tank, cylinders mounted in each of said alter
‘to equalize the pressure in 'saidcompartments, a plurality
nate compartments at'right angles to the radius of said
of skinner'arms pivotally mounted around the inner pe
tank with oneend in open communication with the com
the intermediate compartments of said tankrreciprocable
‘means responsive to the ?uid pressure in said alternate
compartments connected to said levers, said reciprocable
means being movable at right angles to' the radius of said
ank, and means for rotating said tank.
4 :In a log-skinning machine, a supporting frame, an
annular tank divided by transverse partitions into a series 30
means connecting said pistons with said arms for swinging
the arms upon reciprocation of said pistons, and mean
for rotating said tank.
tion between said alternate compartments to equalize the
pressure in said compartments, cylinders mounted in’ an
-
References Cited in the ?le of this patent
of compartments with alternate compartments containing
_ a ?uid pressure ‘medium, means establishing communica
a
6. In a log-skinning machine as described in claim 5
including means in the intermediate compartments for
limiting inward swinging movement of said arms.
UNITED. STATES PATENTS
1,444,765
Veeder _______________ .__ Feb. 6, 1923
2,798,519
2,908,302
Hansel ________ ._; ______ __ J'uly9, 1957
. Mullis _______________ __ Oct. 13, 19-59
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