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US2979090A - Log debarking drum - Google Patents

Log debarking drum Download PDF

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Publication number
US2979090A
US2979090A US774518A US77451858A US2979090A US 2979090 A US2979090 A US 2979090A US 774518 A US774518 A US 774518A US 77451858 A US77451858 A US 77451858A US 2979090 A US2979090 A US 2979090A
Authority
US
United States
Prior art keywords
drum
staves
hoops
stave
hoop
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
Application number
US774518A
Other languages
English (en)
Inventor
Gordon F Mcclay
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Canadian Ingersoll Rand Co Ltd
Original Assignee
Canadian Ingersoll Rand Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to FR1202790D priority Critical patent/FR1202790A/fr
Application filed by Canadian Ingersoll Rand Co Ltd filed Critical Canadian Ingersoll Rand Co Ltd
Priority to GB36963/58A priority patent/GB842309A/en
Priority to US774518A priority patent/US2979090A/en
Priority claimed from GB36963/58A external-priority patent/GB842309A/en
Priority to DEC18082A priority patent/DE1147021B/de
Application granted granted Critical
Publication of US2979090A publication Critical patent/US2979090A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

  • This invention relates to log barking devices, and more particularly to the drums of log barking devices.
  • drums for devices of the type to which this invention appertains were generally fabricated by riveting.
  • this mode of :assembly has several known disadvantages, such as the time delay incurred in drilling the rivet holes and the weakening of the members in which such holes are formed. It is accordingly, one object of this invention to provide a log barking drum of welded construction.
  • Another object of this invention is to assemble the various members of the drum in such a manner that the transfer of stresses therebetween is a gradual rather than abrupt process.
  • Figure 1 is a side view of an end portion of a log barking drum constructed in accordance with the practice of the invention
  • Fig. 2 is an enlarged detail of Figure 1 showing the marginal portion of a hoop and the manner in which the fingers of such marginal portion are welded to the drum staves, and
  • Fig. 3 is an enlarged cross-sectional view of Figure 1 taken along the line 3-3 looking in the direction of the arrows.
  • the drum is generally cylindrically shaped and is rotatably supported on flanged rollers 11 in which ride annular tracks or tires 12 encircling the drum and mounted thereon. Rotation of the drum 10 is facilitated by means of a girth gear 13 encircling and secured to the drum 1% and engaging a drive pinion 14 mounted on a drive shaft 15 supported by members 16 (one only of which is shown) and rotated by any conventional type motor (not shown).
  • the drum construction includes several relatively spaced axially aligned hoops and a plurality of elongated staves 18 mounted in spaced parallel relation around the periphery of the hoops and secured thereto by welding.
  • the longitudinally disposed ribs, or staves, 18 are mounted on the inner periphery of the drum 10 thereby presenting an irregular surface to the log for increasing or accentuating relative movement between the logs.
  • the staves 18 have a generally U-shaped cross sectional form and the marginal or free end portions 19 are turned outwardly to provide surperiphery of the collar, or hoops, 20 to which they are secured.
  • the hoops 20 are positioned at predetermined spaced intervals with respect to each other along the length of the staves Iii-the space between the hoops 26 being determined by the strength of the staves 1 8. It is on these hoops that the girth gear 13 and the tires 12 are mounted.
  • the ends of the staves 18 are secured to end covers 21 having central openings through which the logs are loaded in the drum 10 and dumped therefrom.
  • the diameter of the end openings of the drum is generally somewhat less than the inner diameter of the drum 1:) thereby providing a rim or internal flange at the opposite ends of the drum 10 to retard the movement of the logs through the drum 10.
  • the staves 18 are welded to the hoops 20 and the end covers 21 and in order to prevent the abrupt transfer of load or stress therefrom to the staves 18, the marginal portions, indicated in general by 120, of the hoops 20 and the inner marginal portions, indicated in general by 122, of the end covers 21 are scalloped to provide a series of spaced axially extending tapered projections 22.
  • Each projection is slotted at its mid-portion so as to provide at the outer end portion of each projection 22, a pair or" outwardly tapered fingers 24 and 26. It is to be noted that the distance between the approximate center line of each projection 22 is equal to the width of a stave 18 plus.
  • the adjacent fingers 24, 26 of adjacent projections are secured to the opposite edges of a stave.
  • the right hand finger 26 of one projection 22 extends along and overlies the left edge of the associated stave 18, and the left finger 24 of the adjacent projection 22 extends along and overlies the right hand edge of the same stave.
  • the lagging finger 26 of the leading projection 22 overlies the leading edge of the stave 18, and the leading finger 24 of the lagging projection 122 overlies the lagging edge of the stave 18.
  • the staves 18 are secured to the hoops by means of welding at 32 along the edges 30 of the staves and the inner periphery of the hoops. With this construction, it is possible to obtain uniform strength of welding along the entire line of weld, and moreover due to the flexibility of the projections 22 and the fingers 24 and 26 the impact forces and other high loading of the staves is trans mitted gradually to the hoops.
  • any loading of the staves which tend to bend the staves results also in the bending of the projections 22 and the fingers 24 and 26 and the loading or stress in the projections, fingers and hoop increases gradually from the outer end of the finger towards the center of the hoop to a point inward of the bottom of the scalloped portion 21 of the marginal portions of the hoops.
  • the drum is capable of operating under extreme load conditions over extended periods without rupture or failure of the weld connection between the hoops and the staves.
  • welds for each stave extends along the inner periphery of the hoops starting at a point located slightly inward, relative to the center of the hoop, of each finger.
  • each of said projec-- tions being divided to form outwardly tapered fingers

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Butt Welding And Welding Of Specific Article (AREA)
  • Tyre Moulding (AREA)
US774518A 1958-11-17 1958-11-17 Log debarking drum Expired - Lifetime US2979090A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR1202790D FR1202790A (fr) 1958-11-17 1958-09-29 Tambour d'écorçage des bois en grume
GB36963/58A GB842309A (en) 1958-11-17 1958-11-17 Improvements in log debarking devices
US774518A US2979090A (en) 1958-11-17 1958-11-17 Log debarking drum
DEC18082A DE1147021B (de) 1958-11-17 1958-12-16 Drehbar gelagerte Trommel zum Entrinden von Baumstaemmen

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB36963/58A GB842309A (en) 1958-11-17 1958-11-17 Improvements in log debarking devices
US774518A US2979090A (en) 1958-11-17 1958-11-17 Log debarking drum
DEC18082A DE1147021B (de) 1958-11-17 1958-12-16 Drehbar gelagerte Trommel zum Entrinden von Baumstaemmen

Publications (1)

Publication Number Publication Date
US2979090A true US2979090A (en) 1961-04-11

Family

ID=27209473

Family Applications (1)

Application Number Title Priority Date Filing Date
US774518A Expired - Lifetime US2979090A (en) 1958-11-17 1958-11-17 Log debarking drum

Country Status (2)

Country Link
US (1) US2979090A (de)
DE (1) DE1147021B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3269438A (en) * 1963-10-21 1966-08-30 Herbert W Guettler Barking drum

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2684092A (en) * 1948-12-30 1954-07-20 Ingersoll Rand Co Bark-removing drum having welded hoop construction

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2684092A (en) * 1948-12-30 1954-07-20 Ingersoll Rand Co Bark-removing drum having welded hoop construction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3269438A (en) * 1963-10-21 1966-08-30 Herbert W Guettler Barking drum

Also Published As

Publication number Publication date
DE1147021B (de) 1963-04-11

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