US2608224A

US2608224A - Chain-type log barker

Info

Publication number: US2608224A
Application number: US129864A
Authority: US
Inventors: Henrik J Eklund; Clarence W Miller
Original assignee: Murray D J Mfg Co
Current assignee: DJ Murray Manufacturing Co
Priority date: 1949-11-28
Filing date: 1949-11-28
Publication date: 1952-08-26
Anticipated expiration: 1969-08-26

Description

4 Sheets-Sheet l INVENToRs '#w BY@ .N7/M

MWXMW ATTORNEYS.

H. J. EKLUND ETAL CHAIN-TYPE LOG BARKER Aug. 26, 1952 Aug. 26, 1952 H. J. EKLUND ETAL CHAIN-TYPE Los BARKER 4 Sheets-Sheet 2 Filed Nov. 28, 1949 Enum m,

a) @P Nm MEN 0.@ www @ma ATTORNEYS.

H. J. EKLUND ET AL CHAIN-TYPE LOG BARKER Aug. 26, 1952 4 Sheets-Sheet 3 Filed Nov. 28, 1949 g INVENTORS BY Me/#Zwam H. J. EKLUND ETAL CHAIN-TYPE LOG BARKER Aug. 26, 1952 4 sheets-sheet 4 Filed Nov. 28, 1949 IN V EN TORS ,4 rroRA/Eys.

Patented ug. 26', 1952 CHAIN-TYPE Loo BARKEn Henrik J. Eklund, Wausaufand Clarence W. vMiller, Eland,Wis., assignors to D. vJ.-Mur`ray Manufacturing Cc., WausaurWis., a corporation of Wisconsin Application .November 28, 1949, Serial No. 129,864

. 1 O ur present invention relates generally to V improvements in the artV of removing coverings such as bark from round elongated bodies such as logs, and relates more especially to improvements in the construction and operation of mechanical -log barkers or bark removers.

v.The principal object of our invention is to provide vvarious improvements in mechanism for removing coverings such as lbark from elongated cylindrical bodies such as logs, whereby the utility Aand eiciency of such mechanisms is enhanced to amaximum.

Itis very desirable, especially in the paper industryto removethebark from logs before theA Wood is utilized for other purposes, and although 9 Claims. (Cl. 144-208) many different vftypes ofso-called log barkers have heretofore been proposed and usedl commercially; none have-.proven entirely satisfactory under all conditions of use. Perhaps the most successful of theseprior devices for debarking small logs is shown and described in our (io-pending,applicationl Serial No. 74,838, filed February 5,1949, wherein a portable unit consists of a rotary support for the successive logs and a chain. rotor manually movable along the rotatingglogs resting upon the support, are utiliadgfoilthe' treatment of. pulpwood logs and fence posts at'the site of initial cutting ofthe trees-.1, v,

1 In.thisprionmachinethe chain rotor has two series 'of oppositely inclined chains spanning the gap between two side disks, one of these disks being firmly attached to the rotor shaft while the other is movable therealong so as to permit the chains to engage and wrap themselves about the periphery of the rotating log when the rotor is lowered into active position. Since the vertical plane of the axis of rotation of the logs is fixed andthe position of the central vertical plane of the rotor between the disks varies as the chains are flexed and the two disks'approach and recede `from each other when treating logs of varying diameters and when yexerting more or less downward pressure on the rotor, the chains of this priorrotor structure do not always exert uniform pressure around the log peripheries, thus reducing the eiectiveness of the rotor whenever these two vertical planes are not coincident.

Then too, because of the fact that the debarking rotor of our prior portable vlog peeler must be manually advanced along the rotating logs andoiers considerable resistance to such advancement when the bark is firmly amxed, the job of advancing theurotor becomesquite stren- Y 2 Y uws-Hand tedious as Ythe successive logs are treated. 1 Thisprior portable debarking machine moreover is quitevdiicult toload and tounload because .the logs are applied laterally andare fixed against axial shiftingwhile they are being debarked. However, this previous. equipment does provide for mechanical rotation of both the rotor and the` logs, vand vthe entire unit is portable, but we have found that the chainrotor einciency, andthe ease `and safety of operation, and the capacity of these portable outfits maybe. greatly enhanced so as to increase the general utility-thereof. ,Y l p j It is therefore an important object' of the pre/sent4 invention to providean improvedn chain rotor forf debarking logs, wherein an vannular series'of alternate oppositelyinclined chains is revolvably suspended so that the rotorgassemblage Willman-` tomatically centralise Vitself` relative to thejlogs as it is broughtjint'o active position. p l, '4 j Another important object of this'inventionis to provide a log peeling rotorcomprising Yaseriesrv of ,chainsl spanning the gap between two side chain-supporting jdisks mounted upon a propelf ling shaft, and wherein both disksk are movable alongtheshaftnaxis soV as to cause the chains to jmostgeiectvely cooperate `with the barkior peripheries ofthe logs which are vbeingpeeled; 1' g `A further' important object of theinvention to provide an' improved log barking rotorV of` the chaing'and Y suspension shaft type, lin which` the successivechains are maintained taut at` alltimes and are'uniformly vdistortable by both,centrifugalforce and by the logs to which they Vvare applied, so that they Ywill most eciently act uponlall portions of irregular logs as well as logs of varying diameters.V v c l stillan'other object of our invention is to pro,- vide various improvement in the Yconst'ructionanfl operationofportable .log debarking units where* o various views.

chain end attachments associated therewith;

Fig. 4 is a side elevation of one type of our improved portable log barker provided with a mechanical log rotating and feeding device;A

Fig. 5 is a top View of the vmechanical log rotating and feeding device of the unit shown in Fig. 4;

4 inclined both inwardly and helically relative to the shaft axis. Each of the disks I5, I6 is provided with a rigid hub I8 which snugly embraces and is slidable toward and away from a central flange I9 formed integral with or rmly secured to the shaft Ill, and a helical compression spring is interposedbetweenthis flange I9 and the adjacent end of the hub I8 of each chain suspension disk I5, I6 in order to maintain the chains II, I2 normally taut and to resiliently resist deflection thereof. The two springs 20 should exert approximately equal spreading pressure against the two disks I5, I6, and in order to prevent these disks -fromlrotatingrelatlve to the shaft I0, each hub Fig, 6 is an end view of the portablel outfit of Figs. 4 and 5, but merely showing the'center lines of the rotor chains in heavy dotted lines; Fig. 7 is 'a side elevation of lanother type of our improved portable log barker provided with pressure rolls in addition to modified mechanical log' rotating and feeding mechanism, for holding the logs down against the feeding device;

' Fig; 8 is a top view of the modified log rotating and feeding mechanism of Fig. 7; and

Fig. 9 is an end view of the modified assemblage of Figs. 7 and 8, again showing only the centerv lines of the rotor chains in heavy dotted lines.

` While 'the invention has been shown and rdescribed as having special utility when applied to portable units for debarkin'g relatively small pulpwo'o'd logs and fence posts, it is not our desire oiintiit to limit 'the 'improved features to such specific use since some of Vthem may obviously be utilizedmore' genefr'ally;V and it is also contexi'plated that descriptive teriils used' herein be given the broadestl possible 'interpretation consistent 'with the disclosure.

The improved portable log barking units con'- sftitutingour -present invention, each" comprise, a portable framework'having thereon means for positively rotating the successive logs about their longitudinal axes and for simultaneously feeding them along these axes through a debarkirfg Zone, an improved chain "rotor assemblage revolvable upon the 'framework 'for stripping the bark from the rotating logs 'as they are -propelled through the debat-king zone, and means also carried by the framework for withdrawing the Vremoved bark from the zone. A

Since the improved chain rotor assemblage may be utilized in various types oflog barkers including portable machines such'as shown herein, its structure and operation will first be described. This improved log debarking rotor'is shown in detail'in Figs. 1,V 2, 'and 3, and comprises in general a driving shaft I 0 `having an annular series of any suitable number of oppositely inclined elongated bark stripping elements or normally taut chains II, vI2 revolvably suspended from and disposed vabout the shaft axis so that-the'successive chains Il. I2 of the 4series form a central trough or valley surrounding the carrying shaft IIl. The outer ends I4 of the successive oppositely inclinedichains II, I2 vare secured to the peripheries `of spaced supporting members or disks I5, I6 respectively, by means of U-bolts Il, while the inner ends I4 of the alternate chains are likewise secured to these disks I5. 'I6 considerably nearer the supporting shaft axis by similar U-bolts I1', and the chains thus span the space between the two disks and are I8 andthe adjacent enlarged shaft portion is provided with 'a' spline 2| which, in the specific structure shown, is secured to the hub by a screw 22 and coacts with a groove 23 in the shaft III.

When this improved rotor assemblage is revolved the chains II, I2 will tend to initially deflect outwardly due to centrifugal force acting thereon, thereby ycompressing the springs 20 and pulling-both disks I5, I6 a short distance toward'I` each other and toward the central shaft flange' I9. However, when a log 25 is positioned within the valley formed by the revolving chains II, I2. and pressure 'is applied tending to force the log periphery into this Valley, the chains will deflect inwardly and wrap themselves about the 'adjacent log surface as the successive chains of the series are revolved intov engagement with the log. As each of these successive chains II, I2 approaches the log 25 it delivers an impact blow to the bark, and it is thereafter bowed inwardly by p ressureV and is dragged along the log periphery thereby effectively tearing Ythe bark which has been loosened by the impact, from the body of the log. This bark removing action is accomplished by each of the successive rapidly revolving chains II, I2, Aso that the bark is gradually removed by increments as the rotor and log are relatively advanced, and while the rotor specifically illustrated embodies eight chains II, I2 any desired numberof these oppositely'inclined bark removing elements may be utilized. The improved rotor may either be advanced along the rotating log as in our co-pending application hereinabove referred to, or this rotor may be revolved about a normally fixed axis While the logs 25 are advanced longitudinally therebeneath.

Figs. 4, 5 and 6 illustrate more or less diagrammatically an improved portable unit wherein the successive logs '25 are transported longitudinally beneath such a revolving chain rotor., and this particular embodiment of the invention com prises in general a rigid elongated-,logfsupport or bed 26 mounted upon transporting wheels 2l and having an upper frame 28 kfixedly secured thereto; two sets of angularly adjustable spur wheels 29, 3u carried by the bed 2s and adapted to rotatably support the'successive rlogs 25 while feeding them longitudinally 'through the debarking zone located within the upper frame 28; one'of the improved Vchain rotors revolvably and swingably suspended within Athe 'debarkln'g zone by one endl of a 4swing' beamfor' lever `3l having Yits medial ,portion Vpivotally secured to the frame 28 while its 'opposite'end carriesv a rotor counter balancing weightV 32; an endless conveyor 33 for theremovedbark and refuse mounted on the `bed 26 beneath the debarking Zone; and a propelling-engine or motor 34 carried by the upper frame -28 and being drivingly connected to the-

spur wheels

29, 30, to the debarking rotory'and to theconveyor 63;

5 The elongated support or bed 26 vmay be durably constructed of any desired length from standard channel and angle bars, and the upper frame28 may be `likewise fabricatedwhile the wheelsr 21 provide 4for convenient transportation of the unit to the site of cuttingof the trees from which the logs 25 are produced, or to any other source of supply. Each of the spur wheels 29 .is journalled forrotation in aA yoke 35 While each'of the yother set of. spur wheels 30 is like-y wise. Yjournalled 'in a reversely disposed yoke 36, vand these

yokes

35, 36 .are swingable about upright pivot shafts 3] journalled for rotation on the bed 26, see Figs. 4 and 5.V Theyokes 35 are pivotally connected to a bar 38 extending along one side ofthe bed 26, and-theyokes 36 are likewise pivotally connected to another bar 39 at the opposite side of this bed. VThese bars 38,'39are paralleljtogeach other and the medial portions thereof are interconnected `by a pair of links 4 3, 4l and an interveninglever 42 Vwhich isswingablymounteduportthe bedv 2.6 by a pin 43, and one extreme end'of which connected to a block 44 by means of anotherlink 45.1 The block 44 is internallyscrew threaded for coaction with a threaded spindleu46 journalled for rotation on the bed 2.6 and having alhand wheel 41 at its outer end, so that vrotation ofthe hand wheeld willnswing the lever 42 about the xed pin.43andwill cause the bars 3 8, 39 to move laterally toward o r away from each other and longitudinally vin opposite directions, thereby swinging the

yokes

35, ,36 about their pivot shafts 31 Aandsimultaneously varying the angularity of all the log supportingspur

wheels

29, 35 while still maintaining'thern parallel to each other@` Each"spur wheel 29, has a bevel gear 49 secured to one side thereof, and each of these gears 49 Vmeshes with the upper teeth of a double bevel pinion 56 vsfecuredto the'fxed yupright pivot shaft3l of the icorr'espondingspur wheels 29;'A Ihe'bevelfgearsAS which 4are Vattached to the spur wheels '2'9have their't'eeth directed in 'the 'opposite Vdirection from `the teeth o'f the gears V49 which are attached to'the' other spur Wheels 30; 'and Vthe lower"teetli 'of 'the pinions 50`on' one side of the"bed,26 mesh with'bevel pinions `5l secured toa horizontal 'shaft 52`while the lower teeth of the pinions 50 on the opposite side` of this bed likewise mesh with similar 'bevel pinions 5I' secured to another horizontalshaft 53.V VThese shafts 5 2, 53 are parallel 'and are rotatable in the vsame directionsr by meansmof two gears 54, 55 at the/forward shaftends, 'which mesh with a pinion 56 carried byadriving shaft 5l and the latter is rotatable at relatively low speed by a speed reducer 58 of wel'lknowniconstructionandoperation and which has a power shaftA 59 protruding from one `of its sides and another'slow speed driven shaft 60 projecting from its opposite side. Since the shafts152'f53, are rotatable in the same directions,the log` supporting spur wheels A2 9, 30 are all simultaneous-f 1y rotatable inthe same direction to positively rotate the logs 25- about their own longitudinal Y axes, and the angular dispositionV of these spur through-.theunitat any desiredspeed. 4l f When the logs 25 are relatively'long, it Yis also desirable to provide some means for guiding and supporting the overhanging ends thereof or for holding them against the spur wheels 29,- 30, as they approach and leave the debarking zone. Such means for guiding the logs 25 is shown in Figs. 4, 5, and 6, and comprises an idler roller 62 supported by means of spaced leaf springs 63 considerably beyond each end of the bed 26. Each of these rollers 62 is freely rotatably mounted upon the free ends of the adjacent springs 63, and has tapered opposite side'flanges 64 forming a log guiding valley the central vertical planes of which is approximately coincident with the central vertical longitudinal plane of the -log supporting cradle formed by the two sets of

spur wheels

29, 30. The successive logs 25 are eifectively supported and guided by the rollers 62 as these logs are admitted to and ejected from. the machine, and the roller carrying springs 634 will deflect so as to compensate for varying log diameters as well as for crooked logs. The rollers 62 also greatly facilitate loading lof ther-bark covered logs longitudinally upon the rotating and revolving table, and subsequent removal of the stripped or debarked logs 25. .Y K The shaft l0 of the improved debarking rotor which is journalled in and suspended from the. lower end of the lever 3| within the frame 23, is provided with a driving sheave 65 which is engaged by one or more V-belts 66 coa-atingwith another sheave 61 mounted upon the lever supporting pivot shaft 68, and this shaft 68 is adapted to be positively rotated at a relatively highspeed by another multiple V-belt drive 69operable by the propelling motor 34, see Figs. 4 and 6. The counter balancing weight 32 which is carried by the end of the lever 3| remote'from the. chain rotor, serves to loalancethe weight of this rotor; and the extreme end of the lever 3| beyond the debarking rotor is provided with a manipulating arm 'I6 for effecting lowering of the chains Il, l2 against the work. The motor 34 may be an internal combustion engine, an electric motor, or any other suitable source of rotary motion, and the counter shaft 68 is also drivingly connected `to the power intake shaft 59 of the speed reducer 58 by a chain drive4 7|, while the poweroff-take shaft of the reducer 58 is `connected to the drive shaft l2 of the refuse conveyor 33 by another chain drive 13. The propelling motor 34 may also be provided with a manually controlled clutch 14, and the bark removing conveyor 33 which is suspended from the bed 26 beneath the debarking zone may be of the endless type having anY upper stretch or run adapted to receive the.

gravitating refuse and deliver it toward the rear end of the unit beyond the wheels 2l. l

When the portable barker of Figs. 4, 5, and 6 has been properly constructed as above described, it may be readily transported with the aid of the pneumatic tired wheels 2l to any locality forsup-`I plying the successive logs 25 thereto. The motor 34 may then be operated to simultaneously and rapidly revolve the chain rotorl in the direction` indicated by the arrows, to rotate all of the spur Wheels 2S, 30 in the same direction, and toactu ate the conveyor 33, whereuponthe successive vlogs may be transferred from a loading platform or feed table over the front guide roller 62 and onto the rst set of

spur wheels

29, 30. These wheels due to their angular disposition will feed. the entering log25 toward thedebarking 'zone While also-.rotating Vitabout 'its horizontal axislof advancement.. andzthe speed .of advancement. of the .log lcan be regulated bymanipulating the handiwheelJH. The-arm. 10 may then be utilized tobringthe rotor chains |2 intolengagement with' thelog periphery and'. to wrapthem more ori less about the log. The rapidly revolving rel'- atively rough iiexible elementsor. chains l2 y will-then pound andtearthe ,bark fromr theradvancirigand rotating `logi andthe removed refuse will; drop upon the conveyorl 33 which removes it fromthe unit. As the advancingv end of the stripped log 25 leaves the

spuriwheels

29, 39. it engages'the guide roller'62 at the. delivery end of' the machine, and` these rollers 52 Willrise or fall so as to accommodate logs. of varying diameter` due? tothe deflection of theirs'upporti'ng springs 63.

While the improved barking unit shown in Figs.-4,5,and"6 embodies two sets of 'cooperating angularly disposed spur wheels 29, 30for feeding the logs, and merely depends upon the weight of the logs v25 and upon the downward pressure applied by the chain rotor, tohold the logs within the' Asupporting cradle, only one set of feed wheels isa'ctually required and it is also desirable in some cases toy positively press and hold the logsagainst the spur wheels. Such modications are illustrated in Figs. 7, 8 and 9V wherein the log supporting and feeding cradle comprises a single series of" angularly disposed rotatable spurnwheels 1 9 cooperating with a series of coaxial rolls 80 to form the log rolling and conveying trough, while the logs-25 are pressed into contact with the spur wheels 1'9 and rolls 80 by means oi' rollers 8| which vmaybe forced downwardly at will with the aidv of hydraulic v cylinders 82 and pistons 83 mounted upon the portablerdeck frame 28, Since the major portion of this modified unit is the same as that previously described, only the differences between the two portable log barkers will be described.

Each of the log rotating and feeding spur wheels 19 is `ournalled for rotation in a yoke 85 and i's'provided on one face with a bevel gear 84, and each yoke 85 is swingable about an upright shaft 86 and is-pivotally attached to a connecting rod' 81 at one side of the bed 2G, so that longitudinal shifting of this rod will swing all of the yok'es' 85 about their pivot shafts 86 to a like extenth ne of the spur wheel supportingl shafts i's elongated and connected by a link 88 with an internally threaded block 89 which coacts with a threaded *rod 90 journalled for rotation in the bed 28 and having a handwheel 9| at its outer end whereby turning of the vhandwheel 9| will simultaneously vary the angularity of all of the spur wheels 19 by shifting the rod 81. The bevel gear 84 of each spur'- wheel 19 coacts with the upper teeth of a double bevel pinion 92 mounted upon the adjacent Ashaft 36, and the lower teethof each of thesepinions 92 mesh with a bevel pinion 93. All of these latter pinions 93 are secured `to a common drive shaft 94 journalled on the bed 2Ev and having a gear 95 secured to one end .thereof and the gear- 95 meshes with a driving gear 96 secured to the power delivery shaft 51 of the speed.

reducer 58, and it should be noted that all of the spur wheels 19 are thuspositively rotated whenever the shaft 51 is rotating. The coaxial rolls 80 which cooperate with the spur wheels 19 to form the log supporting vor carrying cradle, are all mounted upon a common shaft 91 which is rotatably mounted at the opposite side of thel bed 28 and has av driving gear 98 at its end ooacting withzthedriyins ,gear ;9.6,.through a pair of speed changing idlerfgears 99so,that all of the `rolls willalsobe simultaneously rotated whenever the spur 4wheels19fare beingrotated.

Theicylinders 82 ofv the improved mechanism for. positively `holding the logs 25 against the feed wheels 19 androlls 80, arepivotally suspended froml theupper frame, 28 by means of pins |0|, andA the pistons 83 are provided at their lower endswith. cross-heads |02 which are guided for vertical movement in guideways |03, as shown in Figs. 7 andl8. The pressure rollersl 8| which are cooperable with. the logs 25 at Ythe opposite ends of the debarking zone, are rotatably suspended from the cross-heads |02, and the hydraulic pressure for actuating the pistons 83 is created by a rotary pump |04 mounted upon a liquid supplytank |05 carried by the upper frame `29, and which is driven by the propelling motor 34 through the pivot shaft 68 and a chain drive |06. The tworollers 8| may be raised or lowered in'- dependentlyf of each other by the attendant, so asto rmly seat the logs25 within the log rotating and advancing'l cradle vin horizontal position and to prevent tilting thereof.

During normal operation of the modified portable logbarking unit shown in Figs. 7, 8 and 9, the unit may be transported to the locality of the log supply and after the motor 34 has been placed in operation so as to rotate the feed wheels 19 and rolls 80 and to actuate the refuse conveyor 33, the successive bark coated logs 25 may be delivered longitudinally from a loading platform or table onto the first wheel 19 and roll 80 of the log rotating and'feeding cradle. This initial spur wheel 19 due to its angular disposition, will advance each log 25 horizontally along the supporting cradle, and as the fresh log approaches the debarking zone, the front pressure roller 8| may be lowered hydraulically to prevent tilting and to hold the log in firm contact with the feeding element. The chain rotor may thereafter be revolved and lowered against the log periphery with the aid ofthe handle 10 to gradually remove the bark, and as the stripped end of the log 25 emergesY from the debarking zone the other pressing roller' 8| maybe lowered into engagement therewith so'as to prevent undesirable tilting of thetrailing end of. the stripped log. The resilient pressure applied by the rollers 8| will also cause the single set of spur wheels 19 to effectively grip and rotate thelogs about their longitudinal axes, and by varying the angularity of these feed wheels 19y with the aid .of the hand-wheel 9| the rate of' advancement of the logs may be varied as desired. A

From theforegoing detailed description of the construction and operation of our invention, it should be apparent that We have in fact provided an improved portable l'ogfbarker which is simple and durablein construction, and which is also highly eiiicent in useand flexible in its adaptations. The portable unit may be readily transported to the site of cutting of the trees from which the logs are derived thereby saving on cost of transportation by eliminating necessity of carting the useless bark, or the outt may be transported bodily to any other place of log concentration. The equipment is adapted to handle logs of various diameters and of diverse lengths, in a safe yand expedient manner, andhas enormous capacity considering its size and the power required to operate the mechanism.

Our improved rotor assemblage wherein both of the ,chain supporting disks |5, |6 are4 movable along the driving shaft I*0,;wi11 permitthe annu- .i9 lar valley formed bythe oppositely inclined vchains Il, I2 to center itself with respect to irregular logs 25; and the helical disposition of these chains combined with their inward inclination toward the shaft axis,V causes these elongated flexible bark stripping elements to most effectively wrap themselves around the log periphery after eachimpact blow has been 'delivered. These impact blows tend to split and loosen the bark, while the subsequent dragging vof .the chains along the log. will strip the loosened bark `therefrom, and the rotor" may be conveniently manipulated with the aid of the handle 10. The springs 2i) coacting with the flange i8 on the shaft I tend to constantly maintain the chains taut, but will permit outward deflection thereof due to centrifugal force, as Well as inward deflection due to lowering of the rotor against the work.

The improved mechanism for positively advancing thelogsY through the debarking zone While also-rotating them about their own axes, may be quickly-and easily adjusted to vary either the rate of feed or the speed of rotation. The assemblage wherein two sets of spur wheels 29, are provided will perhaps insure more positive driving of the logs; but the assemblage Which utilizes only one set of spur wheels 'i9 cooperating with rolls 80 to support the logs is somewhat simpler, and will function effectively especially if press rollers 8l are utilized. Both of these log rotating and feeding mechanisms provide elongated cradles for safely and effectively supporting logs of varying diameter.

The guide rolls E2 with their tapered side flanges 64, and the press rollers 8| coacting with the upper portions of the logs, both provide effective means for preventing the elongated logs from tilting longitudinally. The leaf spring supports 63 for the guide rolls 62, permit these rolls to assume various positions so as to compensate for irregular logs 25 and logs of different diameters, and these rollers tend to maintain the logs in horizontal position and effectively guide them toward and away from the feeding cradle. The fluid pressure actuated press rollers 8| are resiliently urged toward the logs by the cylinders 82 and pistons 83, and likewise assist in preventing the logs from tilting while also augmenting the feeding or log advancing action of the spur wheels.

The bark conveyor 33 beneath the bed 26 and the debarking zone, prevents refuse from accumu lating to an extent whereby the bark removal is interfered with, and this conveyor is confined in a safe place and is operable by the same motor 34 which drives the other mechanisms. able protective covers for exposed drives and mechanism may also be provided, and while the improved portable unit is especially adapted to debark pulp wood logs and fence posts it is also useful for stripping larger logs.

It should be understood that it is not desired to limit this invention to the exact details of construction and to the precise mode of operation of the typical portable log debarkers herein specifically illustrated and described, for various modifications within the scope of the appended claims may occur to persons skilled in the art.

We claim: Y

1. A log barker comprising, `a log support, means for rotating and for axially advancing a log resting upon said support while preventing lateral displacement of the log, and a power driven barking rotor having a shaft disposed Suittransversely of the log and a pair of spaced coaxial disks both mounted ,upon and movable along the shaft laterally of the log and also having an annular series of oppositely inclined normally taut elongated flexible chain elements spanning the gap between said disks.

2. A log barker comprising, a portable bed, a cradle for simultaneously rotating and feeding thelogs along said bed while preventing lateral Idisplacement of the logs, a shaft journalled' upon said bed above and extending across' said cradle, a pair of spaceddisks slidably mounted upon and revolvable'by saidfshaft, and an annular series of oppositely inclined taut chains secured to said disks and providing a circular valley adapted tc engage the log peripheries, said disks being movable to cause the valley to shift laterally of the logs advancing along said bed.

3. A log `barker comprising, a log support, means for rotating and for axially advancing a log resting upon said support while preventing lateral displacement of the log, and a power driven barking rotor having a shaft disposed rtransversely of the log and a pair of coaxial disks means for rotating and for axially advancing a log resting upon said support while preventing lateral displacement of the log, and a power driven barking rotor having a shaft disposed transversely of the log and a pair of coaxial disks both mounted upon and movable along the shaft laterally of the log, said rotor alsoA having an annular series of oppositely inclined normally taut elongated flexible chain elements spanning the gap between and secured to said disks with the opposite ends of each element disposed at different distances fromv the shaft axis.

5. A log barker comprising, a log support, means for rotating and for axially advancing a log resting upon said support while preventing lateral displacement of the log, and a power driven barking rotor having av shaft disposed transversely of the log and a pair of coaxial disks both mounted upon and movable along the shaft laterally of the log, said rotor also having an annular series of normally taut elongated flexible chain elements spanning the gap between said disks and disposed helically with respect to the shaft axis.

6. A log barker comprising, a log support, means for rotating and for axially advancing a long resting upon said support while preventing lateral displacement of the log, and a power driven barking rotor having a shaft disposed transversely of the log and a pair of coaxial disks both mounted upon and movable along the shaft laterally of the log, said rotor also having an annular series of' elongated flexible chain elements spanning the gap between and secured to said disks helically with respect to the rotor axis.

7. A log barker comprising, a cradle for'simultaneously rotating and feeding a log longitudinally while preventing lateral displacement thereof, a shaft journalled for .rotation above and extending across said cradle, spaced disks slidably mounted upon and revolvable by said shaft, and an annular series of normally taut chain elements each having its opposite ends secured to said disks at different distances from V`the aaxis'of said. vshaft:andi'dspos'ecthelically with respecttasaiaxis.

u8.. Ailogbarker comprisingamradlei forasimultaneously frotating and feeding -.aV log longitudinally `while preventing lateral :displacement thereof, a shaft-journalled. for. rotation: above-and extendingacross said'cradle, spaced disks slidably' mounted uponand' revolvable by said shaft, anfannular seriesaof oppositely` inclined chain elements .each having its opposite ends secured tofsaid disksat different distancesfrom the axis of: saidshaft,.and means for*k constantly resiliently .urging :fsaid ,-disks A4'apart to normally Lmaintain said elements in tautcOnditiOn.

' 9. Alog:.barker comprising, a'cradle forsimultaneously rotating and 4feeding a log longitudinally while preventing Vlateralv displacement thereof, a shaft journalledffor rotation :above andlextending across .-:said 1 cradle, spaced'- disks slidably :mounted upon and vrevolvable f by f said shaftfand amannularfseries of-helicalfand oppostely inclined :and *normally taut l chain -ele ments r-'secured to said-disks vand providing :an annulanvalley engageable with thelog periphery,I .both of fsaid-A dsksbeing -slidable -along :said shaft toipermit-fsaid valley to shiftflaterallyzof ther'advancing. log.

:HENRIK J, EKLUND.

CLARENCE W. MILLER,

KAille VofV this patent:

UNITED STATES .PATENTS fNumber :Name tDate l1,090,146'3 '.-Ei'dsaether 'Mar17,'1914 1,248,700 Olson zDec. 54,1191? 1,277,808 .Witham Sept. ,3,/1918 1373,243 auiHellstrom. .Mar 29, ',1921 1,438,904 1 'nCrouse Dec.i;1-2,l.`922 1,539,603 Saprones `May i 26, 11925 2,0252337 'lCamden -..--\.Dec'.r24,i1935 2,390,459 Bower. f.Dec..4, 1945 @25448;689 SchmzrlerV Sept. 7,1948 432,4833-338 Douglas ,Sept. .-27,1.1949 2;520,`421 @Mathewson ret dal. mug. ;29, ,l L19.50

" FOREIGN LPATENTS Number Country Date .713,472 LNorway 01E-1904 .69,348 1 l-Sweden of11-928 .Sweden of '1948