EP0575161A2 - Timber pole division - Google Patents

Timber pole division Download PDF

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Publication number
EP0575161A2
EP0575161A2 EP93304685A EP93304685A EP0575161A2 EP 0575161 A2 EP0575161 A2 EP 0575161A2 EP 93304685 A EP93304685 A EP 93304685A EP 93304685 A EP93304685 A EP 93304685A EP 0575161 A2 EP0575161 A2 EP 0575161A2
Authority
EP
European Patent Office
Prior art keywords
shaped
sector
pole
strips
strip
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.)
Withdrawn
Application number
EP93304685A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0575161A3 (enrdf_load_stackoverflow
Inventor
Richard Martin
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.)
Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0575161A2 publication Critical patent/EP0575161A2/en
Publication of EP0575161A3 publication Critical patent/EP0575161A3/xx
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H17/00—Fencing, e.g. fences, enclosures, corrals
    • E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
    • E04H17/1413—Post-and-rail fences, e.g. without vertical cross-members
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B1/00—Methods for subdividing trunks or logs essentially involving sawing
    • B27B1/005—Methods for subdividing trunks or logs essentially involving sawing including the step of dividing the log into sector-shaped segments
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H17/00—Fencing, e.g. fences, enclosures, corrals
    • E04H17/14—Fences constructed of rigid elements, e.g. with additional wire fillings or with posts
    • E04H17/1413—Post-and-rail fences, e.g. without vertical cross-members
    • E04H17/1447—Details of connections between rails and posts
    • E04H17/146—Details of connections between rails and posts the rails being attached to the front faces of the posts

Definitions

  • This invention relates to methods of dividing timber poles to produce a multiplicity of usable wooden strips, and also to wooden strips whenever produced by such methods.
  • the invention further relates to cladding or fencing whenever made from such wooden strips.
  • Timber pole is used herein to refer to a length of timber having a substantially circular cross-sectional shape. This term is intended to include within its scope a naturally tapering rustic pole, a peeled (that is, having its bark removed) naturally tapering pole, a surface-smoothed (that is, having its bark removed and also having a certain amount of further smoothing operations performed thereon) tapering pole or a machine-rounded pole (that is, a pole of cylindrical, or substantially constant, cross-sectional shape).
  • Small diameter poles may be employed for example in the manufacture of garden furniture or as supporting posts for fences or the like, with essentially no machining operations. If however an area is to be covered, as in the case of fencing or cladding, it is conventional to split - and usually by a sawing operation - a pole diametrically along its length, whereby each half-pole may be nailed or otherwise affixed to a number of supporting posts, with the flat faces of the half-poles contacting the posts.
  • each half-pole covers a width equal to the diameter of the pole and yet projects from the supporting post by a distance equal, at its greatest, to the radius of the pole.
  • the thickness of such fencing or cladding at the adjoining edges of the half-poles reduces to nil, and there are invariably regions where there are gaps between the half-poles, because of the irregular nature of natural, unprocessed timber.
  • a method of dividing a timber pole of the kind defined herein so as to produce a multiplicity of usable wooden strips which method comprises:
  • a timber pole may be divided typically into eight strips, firstly by cutting the pole into four sector-shaped pieces each having approximately 90° included angle, and then cutting each sector-shaped piece into two separate strips, one of which is of generally triangular cross-sectional shape (being the inner part of the sector-shaped piece) and the other of which is generally of a "truncated-sector" shape, being the outer part of the original sector-shaped piece.
  • Each truncated-sector-shaped strip is bound by the outer curved surface of the original pole, the outer parts of the two radial cuts separating that sector-shaped piece from the pole, and the further cut which separates the triangular-shaped strip from the truncated-sector-shaped strip.
  • the minimum number of sector-shaped pieces it is in fact preferred for the minimum number of sector-shaped pieces to be four, or some other higher, but even, number of pieces.
  • the method is preferred for the method to be performed in such a way that one of four, six or eight sector-shaped pieces are produced, resulting respectively in eight, twelve or sixteen finished wooden strips.
  • each first cut may be a diametral cut performed, for example, by a band saw, a circular saw or the like.
  • two diametral cuts would be made, at right angles to one another. This may be achieved with a suitable machinery arranged to effect both cuts substantially simultaneously as the pole is advanced through the machinery.
  • the pole could be passed more than once through a suitable sawing machine, each pass producing another cut in the timber.
  • the method may be performed in such a way that the resultant triangular strips are all of substantially the same cross-sectional shape and dimensions.
  • the resultant inner triangular-shaped pieces may have different cross-sectional shapes and areas. If these strips are then used for fencing or cladding, they will give rise to a somewhat non-uniform and variable appearance.
  • a method of dividing a timber pole of the kind defined herein so as to produce a multiplicity of usable wooden strips which method comprises:
  • a timber pole typically of a larger diameter may be employed so as to yield four generally sector-shaped pieces as well as three generally rectangular strips of wood, which latter strips may of course be further divided by subsequent machining operations, should this be required.
  • Each of the four sector-shaped pieces is generally similar to that obtained by the first-described method of this invention when used to produce four sector-shaped pieces by dividing the pole with two diametral cuts substantially at right angles, except that the actual radius of curvature of the curved surface of each resultant sector-shaped piece is greater than the apparent radius. Then, those four sector-shaped pieces may be sub-divided by means of further cuts, so as to produce four generally triangular-shaped pieces and four truncated-sector-shaped pieces.
  • This invention extends to wooden strips whenever produced from a timber pole of the kind referred to herein, by a method according to the invention as described above.
  • the invention further extends to cladding or fencing comprising a plurality of generally parallel, spaced-apart support rails supporting wooden strips whenever produced from a timber pole of the kind referred to herein, by a method of this invention as described above.
  • the wooden strips may be affixed for example by nailing or screwing to the support rails, with the triangular-shaped strips being disposed alternately with the truncated-sector-shaped strips.
  • each strip is affixed to the support rails so as to be substantially in contact with its next adjacent strips, for at least a part of the length thereof.
  • the triangular-shaped strips interfit with the truncated-sector-shaped strips, so-called "close cladding" may easily be achieved.
  • the triangular-shaped strips may be secured to the support rails first, at an appropriate spacing so that the group therebetween at the rails is slightly less than the width of the further cut on the truncated-sector-shaped pieces. Then, each truncated-sector-shaped piece will not fit tighter to the rails, but will instead be supported by the triangular-shaped pieces. In this way, tight-cladding may still be achieved, notwithstanding an irregular shape in the original timber pole, or shrinkage.
  • the strips When producing cladding or fencing, it is preferred for the strips to be disposed substantially vertically, rather than horizontally. In this way, any rain driving against the fencing or cladding is more likely to run down the generally vertically disposed strips, rather than to run through the fencing or cladding, and appear on the other side. Alternatively, interesting visual effects may be achieved by having the strips lying some other angle to the horizontal or vertical.
  • a substantially round, naturally tapering timber pole 10 which may typically be about 2m long.
  • the pole is initially divided into four sector-shaped pieces by way of two diametral cuts 11 and 12, substantially at right angles to each other.
  • Such cuts are conveniently effected with a single sawing machine having two circular saw or band saw blades with their axes at right angles and disposed one behind the other.
  • the pole will be divided into the four sector-shaped pieces, in one pass.
  • Each of the resultant sector-shaped pieces is then divided by a further cut 13 into two separate strips 14 and 15, the first (14) being of generally triangular-shape and the second (15) being of a truncated-sector-shape.
  • the precise position of the further cut 13 may be selected having regard to the intended use of the resultant strips, and may be positioned such that each radial face of the sector-shaped piece is bisected - that is to say, the length of each side face of each triangular-shaped strip 14 is one half of the radius of the original pole.
  • the further cut may be made at such a position that the length of the sides of the triangular strips is greater than the length of the sides of the truncated-sector-shaped strips - perhaps by as much as 3:1 - in order to allow for the natural taper of the poles. Irrespective of where the further cut is made each strip 14 is of a right-angle triangular-shape, in cross-section, with two sides of equal length.
  • Figures 2 and 3 show similar timber pole dividing methods, where the pole is divided into twelve strips ( Figure 2) or sixteen strips ( Figure 3).
  • the pole is initially divided into a number of substantially similar sector-shaped pieces by means of diametral cuts (three or four, in the cases of Figures 2 and 3, respectively), each of which resultant sector-shaped pieces is then sub-divided to yield a triangular-shaped strip and a truncated-sector-shaped strip.
  • the precise position of the cut resulting in the sub division of each sector-shaped piece may be selected having regard to the intended use of the strips.
  • Figure 4 shows how strips produced by the pole division methods described above may be employed, to form a fence panel.
  • a number of posts 20 (only one of which is shown in Figure 4) are driven into the ground at spaced intervals, each of which posts may comprise a truncated-sector-shaped strip.
  • triangular-shaped strips 21 and truncated sector-shaped strips 22 are affixed alternately to the spaced posts 20, typically by nailing, so as to form a substantially continuous close-clad surface.
  • the strips are likely to be somewhat irregular along their length and so only partial contact may be achieved.
  • the fence or cladding is likely to present a substantially continuous face.
  • the triangular-shaped strips cut from the pole should have a side-length considerably greater than the side-length of the truncated-sector-shaped strips, at the larger diameter end of the pole. Then, the triangular-shaped strips will still have a sufficient side-length, even at the smaller diameter end of the pole, to achieve adequate close-cladding.
  • the spacing of the triangular-shaped strips 21 is shown as being such that the truncated-sector-shaped strips 22 may directly bear on the posts 20. Though this arrangement may give close cladding, in view of the irregular nature of natural timber poles, there still may be gaps between the strips, at certain places. To reduce the likelihood of there being such gaps, the triangular-shaped strips 21 may first be secured to the posts 20, with a spacing at the posts of less than the width of the face of the truncated- sector-shaped strips produced by the further cut 13. Then, on securing the truncated-sector-shaped strips to the posts, those strips 22 will bear on the triangular-shaped strips 21 rather than on the posts, for at least most of the length of the strips. Subsequently, should any shrinkage of the strips occur, the cladding may be tightened by further nailing, to draw the truncated-sector-shaped strips closer to the posts 20.
  • FIG. 5 there is shown a timber pole division method intended for use with a pole of a significantly larger diameter - and typically at least 150mm diameter.
  • the pole is divided into seven pieces by a technique known as "double-slabbing", in which a pair of spaced-apart parallel cuts 25 and 26 are made along the length of the pole to divide it into three pieces, being a centre cant 29 and two side slabs.
  • the side slabs are then further divided so as to make three pieces from each side slab, by effecting two further parallel cuts 27 and 28 spaced apart by the same distance as with the first pair of cuts, but at right angles thereto.
  • This results in two further strips 30 each of which is of generally rectangular cross-sectional shape but having an arcuate outer surface 31.
  • Further cuts, shown by broken lines 32 may be made on each of those three strips 29 and 30, so as to produce truly rectangular strips, if required.
  • This "double-slabbing" method results in four generally sector-shaped pieces 33, which are normally regarded as waste.
  • these four pieces 33 may be treated by the method of this invention, so as to yield eight strips, four of which are of generally triangular-shape and the other four of which are generally of truncated-sector-shape, though of course the radius of curvature of the outer surface 34 of those further pieces is significantly greater than the length of the side of the generally sector-shaped piece 33, before sub-division.
  • the resultant triangular-shaped strips 35 and the truncated-sector-shaped strips 36 may be used in the manufacture of cladding, fencing, garden furniture or the like, in the same manner as has been described above.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
EP93304685A 1992-06-19 1993-06-16 Timber pole division Withdrawn EP0575161A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB929213085A GB9213085D0 (en) 1992-06-19 1992-06-19 Timber pole devision
GB9213085 1992-06-19

Publications (2)

Publication Number Publication Date
EP0575161A2 true EP0575161A2 (en) 1993-12-22
EP0575161A3 EP0575161A3 (enrdf_load_stackoverflow) 1994-03-23

Family

ID=10717416

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93304685A Withdrawn EP0575161A2 (en) 1992-06-19 1993-06-16 Timber pole division

Country Status (2)

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EP (1) EP0575161A2 (enrdf_load_stackoverflow)
GB (2) GB9213085D0 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008011677A1 (en) * 2006-07-27 2008-01-31 Radial Corporation Limited Multiple saw quartersawing

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2344426A (en) * 1942-01-12 1944-03-14 Edward P Stamm Bevel method sawing
US2316111A (en) * 1942-01-12 1943-04-06 Edward P Stamm Method of cutting rectangular lumber
CH308506A (de) * 1950-12-06 1955-07-31 Fuemm Gian Zusammengesetzter Holzträger.
US3961654A (en) * 1973-02-20 1976-06-08 Earl Dean Hasenwinkle Log cutting and rejoining process
US3989078A (en) * 1976-01-07 1976-11-02 Weyerhaeuser Company Log cutting and rejoining process
US4111247A (en) * 1977-01-13 1978-09-05 Weyerhaeuser Company Log cutting and rejoining process for lumber manufacture
WO1989004747A1 (en) * 1987-11-27 1989-06-01 Andrew Karl Knorr Method of sawing timber and timber products formed thereby
AU686093B2 (en) * 1991-09-03 1998-02-05 Radial Corporation Limited Backsawn timber production from radially sawn wedges

Also Published As

Publication number Publication date
GB2267864B (en) 1995-12-13
EP0575161A3 (enrdf_load_stackoverflow) 1994-03-23
GB9213085D0 (en) 1992-08-05
GB2267864A (en) 1993-12-22
GB9312396D0 (en) 1993-07-28

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