US3020943A - Barking drum - Google Patents

Barking drum Download PDF

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Publication number
US3020943A
US3020943A US740053A US74005358A US3020943A US 3020943 A US3020943 A US 3020943A US 740053 A US740053 A US 740053A US 74005358 A US74005358 A US 74005358A US 3020943 A US3020943 A US 3020943A
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United States
Prior art keywords
barking
drum
rings
irons
bark
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US740053A
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English (en)
Inventor
Hjartsater Jacob Johansson
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FIBRE MAKING PROCESSES Inc
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FIBRE MAKING PROCESSES Inc
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Publication date
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27L—REMOVING BARK OR VESTIGES OF BRANCHES; SPLITTING WOOD; MANUFACTURE OF VENEER, WOODEN STICKS, WOOD SHAVINGS, WOOD FIBRES OR WOOD POWDER
    • B27L1/00—Debarking or removing vestiges of branches from trees or logs; Machines therefor
    • B27L1/02—Debarking or removing vestiges of branches from trees or logs; Machines therefor by rubbing the trunks against each other; Equipment for wet practice
    • B27L1/025—Debarking in rotating drums

Definitions

  • 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 barking eitect between the logs and the drum in prior-art drums.
  • the barking effect is comparatively small per unit length of the drum; so the barking drums are made large and long, and their maintenance has been quite expensive.
  • the turning over of the mass of logs causes vibrations and shocks that are transmitted to the machinery, the supporting frame, and their foundations.
  • the barking is more efficient when the drum rotates at a high speed, and at high speed the stresses become very large because of the weights involved and the motion of heavy objects.
  • a major part of the maintenance concerns the fastenings for the barking irons, which have been unable to endure the huge strains caused by the tumbling of the mass of logs. Consequently, it has not been possible to run the barking drums at the higher speeds which give the best barking effect. The problem has been particularly severe when barking heavy wood.
  • An important object of this invention is to provide solid support for and a strong connection between the barking elements or irons, which are longitudinal bars, and their numerous supporting rings, so that the drum can safely and economically rotate at higher speeds, with the resultant increases in the barking effect.
  • Another important object is to provide the drum with lengthwise openings of large size between the longitudinal bars and the supporting rings.
  • 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.
  • Another object is to provide a structure that absorbs the shocks and vibrations produced by operation of the barking drum.
  • Some of these latter objects are achieved by providing a novel attachment of the barking elements to the drumstrengthening rings, by providing the elements themselves with a comparatively flat cross section at their radially inner extremity, usually called the top surface, and by providing that surface with ridges or grooves extending the length of the bar, the ridges being shallow in relation to the height of the bar itself.
  • One or more of these ridges may, in accordance with this invention, be shaped like blunt knife edges set in the direction of the rotation of the drum.
  • the top of one or more of these ridges may have grooves with identical edges on each side.
  • FIG. 2 is a view in side elevation of the drum assembly of FIG. 1.
  • FIG. 4 is a fragmentary View similar to FIG. 3 of a portion of a modiied form of drum also embodying this invention.
  • FIG. 5 is an enlarged fragmentary view in section along the line S--S in FIG. 3.
  • 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.
  • FIGS. 9, l0, ll, and l2 are enlarged cross-sectional views of four different shapes of modied forms of barking elements according to the invention.
  • 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 supporting rings.
  • FIG. 16 is a view in section taken along the line 16--16 in FIG. 15.
  • a drum 1 is suspended by chains 2 which run over a drive sprocket Wheel 3 and idler sprocket wheel 4.
  • the supporting frame may comprise individual sections 5 supported on a base 6.
  • the lateral position of the drum 1 is maintained by rollers 7.
  • the drum 1 may be driven from a motor 8 mounted on the frame 5, acting through gears 9 and 19.
  • the drum 1 comprises longitudinally extending barking irons 11 supported by a series of channel rings 12 and, according to this invention, also by some narrow rings 30, which replace some of the channel rings 12 normally used.
  • the barking irons 11 cornprise M-bars, as shown in FIGS. 1 8, with apexes 13 and 14 of the M facing radially inwardly and with V-shaped recesses 15 and 16 on their radially outer surfaces 17.
  • the two recesses and the apexes are separated by a flat central portion 18.
  • FIGS. 6 and 7 show how this invention secures a longitudinal M-bar 11 to a channel ring 12. In part this is achieved by securing the barking iron 11 directly to the channel rings 12 by longitudinal welds 19 as is current practice. But more important is Vthe reinforcement of this by securing each M-bar to a plate having a pair of V-shaped projections'Zl and 22 that match and fit into the V-shaped recesses 15 and 16 and abut the' outer surface 17, except for cut off ends 23 that assure contact along the edges. Welds 24 along the abutting 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.
  • FIG. 8 shows a narrow ring 3G instead of a channel ring 12.
  • the ring is fastened to the N'bar 11 by plate elements 20 welded to the sides of the plate ring 30hy welds 31 and also to the inside hollows 15 and 16 of the M-bar 11 by the welds 24.
  • FIGS. 3 and 4 Use of the several rings 30 in ⁇ place of some of the conventionally used channel rings 12 is shown in FIGS. 3 and 4.
  • FIG. 3 the area of the openings 35 through which the bark can fall out has been increased byabout 31% over the prior-art structure solely by replacement of four of the channel rings 12 with narrow rings 30.
  • FIG. 4 structure the openings 35 have been increased in area by about 31% by using these narrow rings 30.
  • the strength of the drum 1 and the solidity of the support for the irons 11. is greatly increased by use of the plates 20 and by welding them to the inside hollows 15 and 16 of the M-bar 11 as well as to the rings 12 or 30.
  • the top surface 41 which comes in contact with the logs is provided with a number ofl comparatively small ridges 42.
  • the ridges 42 serve to rub bark off the logs.
  • the bars 49 are shaped with round shoulders 43.
  • ridges 46 are shaped as sharp teeth 47 directed with the rotation of the drum 1.
  • a bar 50 is provided 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 provided on top with ridges 56 and groove 57.
  • 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 ring 12 across the whole width.
  • the rings ⁇ 12.-areV U-shaped and comparatively wide and are used in suf cient 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.
  • the plate 63 is welded both to the inside hollow 64 of the bar 40 and to the side 65 of the ring 12. Welds 66 and 67 are shown. Longitudinal openings 68 between the bars 40 and rings 12 provide for the disposal of the removed bark.
  • FIG. 14 shows section of another ring 3U which gives 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 serve as bark outlets.
  • the ring 30 is well adapted for fastening to the bars by plate elements 70 basically like the plate elements 26.
  • the joint is very solid because the plate element 7i) is welded at 71 in the hollow 72 of the bar 50 and to the side of the plate ring 30.
  • the broad rings 12 can therefore be reduced in number.
  • the rings 30 are also well adapted for bolting a sprocket ring or guide ring 73f for the rotation of the drum.
  • a barking drum 1 employing these comparatively narrow bars Si) fastened to plate rings 70 has much larger area of openings for bark outlet than previous known types.
  • the barking irons o'r the ridges on them may also have grooves, waves, corrugations, or other uneven surfaces, as seen in longitudinal section. To avoid brooming of the logs, all surfaces of the barking elements may be rounded.
  • the barking irons may, of course, have other shapes lying within the scope of this invention.
  • the irons may have larger or smaller ridges or grooves and be of oval, prismatic, or other suitable cross section.
  • 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 dividing the drum into several comparatively short sections which can be rotated at different speeds.
  • FIGS. l5 and 16 show the application of the invention to a drum having a'removable end piece.
  • the M- bars are secured to plate elements 29 as before.
  • the plate elements 20 are secured to a large fixed end ring by welds 81, and the fixed end ring 80 is secured to a removable end ring by countersunk rivets 83.
  • the end ring 32 becomes worn by the logs, it can be removed by knocking out the rivets 83 and putting in a new ring S2.
  • a barking drum comprising: a plurality of circular supporting rings spaced longitudinally from each other and having side walls each lying in radial planes; a plurality of longitudinally extending barking irons spaced circumferentially from each other and lying radially inside said rings, each iron being substantially M-shaped in cross section with the apexes of the Ms facing radially inwardly and the legs facing radially outwardly, to provide 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

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)
US740053A 1957-06-18 1958-06-05 Barking drum Expired - Lifetime US3020943A (en)

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NO3020943X 1957-06-18

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3086569A (en) * 1961-10-23 1963-04-23 Sandison Alexander Greswolde Barking drums
US3230989A (en) * 1961-05-11 1966-01-25 Ingersoll Rand World Trade Ltd Staves for the drum of a log debarker
US3262477A (en) * 1963-12-26 1966-07-26 Manitowoc Shipbuilding Inc Debarking apparatus
US3269438A (en) * 1963-10-21 1966-08-30 Herbert W Guettler Barking drum
US3301289A (en) * 1964-10-12 1967-01-31 Uniweld Inc Debarking drum construction
US3417796A (en) * 1966-02-15 1968-12-24 Manitowoc Shipbuilding Inc Debarking apparatus
US3955608A (en) * 1974-12-16 1976-05-11 Smiltneek Ralmond J Debarking method and apparatus
US5005621A (en) * 1989-09-01 1991-04-09 Price Industries Method, system, and apparatus for debarking roundwood

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1844498A (en) * 1926-11-01 1932-02-09 Westinghouse Electric & Mfg Co Method of welding
US2592054A (en) * 1950-10-03 1952-04-08 Traylor Engineering & Mfg Comp Barking drum
US2688350A (en) * 1950-01-21 1954-09-07 Waller Erik Arne Sectional rotatable log barking drum
US2897858A (en) * 1958-03-17 1959-08-04 Hanson Thomas Paul Debarking-drum construction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1844498A (en) * 1926-11-01 1932-02-09 Westinghouse Electric & Mfg Co Method of welding
US2688350A (en) * 1950-01-21 1954-09-07 Waller Erik Arne Sectional rotatable log barking drum
US2592054A (en) * 1950-10-03 1952-04-08 Traylor Engineering & Mfg Comp Barking drum
US2897858A (en) * 1958-03-17 1959-08-04 Hanson Thomas Paul Debarking-drum construction

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3230989A (en) * 1961-05-11 1966-01-25 Ingersoll Rand World Trade Ltd Staves for the drum of a log debarker
US3086569A (en) * 1961-10-23 1963-04-23 Sandison Alexander Greswolde Barking drums
US3269438A (en) * 1963-10-21 1966-08-30 Herbert W Guettler Barking drum
US3262477A (en) * 1963-12-26 1966-07-26 Manitowoc Shipbuilding Inc Debarking apparatus
US3301289A (en) * 1964-10-12 1967-01-31 Uniweld Inc Debarking drum construction
US3417796A (en) * 1966-02-15 1968-12-24 Manitowoc Shipbuilding Inc Debarking apparatus
US3955608A (en) * 1974-12-16 1976-05-11 Smiltneek Ralmond J Debarking method and apparatus
US5005621A (en) * 1989-09-01 1991-04-09 Price Industries Method, system, and apparatus for debarking roundwood

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NO95219A (en0)

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