WO1996023633A1 - A method for dividing a log and for producing a composed wood unit - Google Patents
A method for dividing a log and for producing a composed wood unit Download PDFInfo
- Publication number
- WO1996023633A1 WO1996023633A1 PCT/SE1996/000113 SE9600113W WO9623633A1 WO 1996023633 A1 WO1996023633 A1 WO 1996023633A1 SE 9600113 W SE9600113 W SE 9600113W WO 9623633 A1 WO9623633 A1 WO 9623633A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- wood
- section
- cuts
- piece
- cross
- Prior art date
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/14—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with substantially solid, i.e. unapertured, web
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
- B27M—WORKING OF WOOD NOT PROVIDED FOR IN SUBCLASSES B27B - B27L; MANUFACTURE OF SPECIFIC WOODEN ARTICLES
- B27M3/00—Manufacture or reconditioning of specific semi-finished or finished articles
- B27M3/0013—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles
- B27M3/0026—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally
- B27M3/0053—Manufacture or reconditioning of specific semi-finished or finished articles of composite or compound articles characterised by oblong elements connected laterally using glue
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/12—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members
- E04C3/127—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of wood, e.g. with reinforcements, with tensioning members with hollow cross section
Definitions
- the present invention relates to a method for dividing a log ac- cording to the preamble of the appended patent claim 1 as well as a method for producing a wood unit composed by a plurality of wood pieces glued to each other, in which it is started from at least an elongated wood piece having a substantially rectangu ⁇ lar cross-section, on which cuts are applied for obtaining a wood piece for said wood unit.
- Rectangular cross-section is defined as a cross-section hav ⁇ ing four right-angled corners and does accordingly also com ⁇ prise a square cross-section.
- a number of different techniques for dividing a log are known, and it is usually proceeded in the way that a number of cuts parallel to each other are applied in the longitudinal direction of the log for gaining planks and boards from the log with a possi- ble intermediate treatment in an edging machine and/or planing machine.
- Raw unrefined products of a comparatively low quality is then obtained, which after drying are delivered to the con ⁇ sumers, of which a part is manufacturer of refined wood prod ⁇ ucts, such as for example glued-joint sheets, pieces of furniture and the like.
- the log is in a first line divided without ob ⁇ taining any degree of refinement of the products obtained.
- the object of the present invention is to provide a method for dividing a log of the type defined in the introduction, which makes it possible to find a remedy to the inconveniences men- tioned above of the log dividing methods according to the prior art and especially makes it possible to in a better way utilise the wood of the log and makes it possible to produce wood products having improved quality properties, as well as provid ⁇ ing a method for producing wood units composed by a plurality of wood pieces glued to each other according to the preamble of the appended independent patent claim therefor, through which glued wood products with improved quality properties may be produced in both a simple and by that labour saving and material saving way.
- second wood pieces By dividing the log in a second step in a plurality of second wood pieces by applying cuts in the longitudinal direction of the first wood piece having a substantially rectangular cross-sec ⁇ tion substantially in parallel with a diagonal plane extending from one corner to another of a rectangle forming the cross- section of the first wood piece, second wood pieces, which may easily be glued to each other, by the fact that they have glue surfaces that matches when they are brought together, in a number of combinations for obtaining glued wood products having good quality properties, are obtained in a very simple way.
- the inven- tional way of applying the cuts means that these products may get very good properties by the fact that they will have a ten- dency to automatically have annual rings standing with respect to several surfaces thereof, so that these surfaces will be very wear resistant.
- the starting wood piece is before the application of said cuts put with said diagonal plane substan ⁇ tially vertically arranged, and the starting wood piece is kept in this position during the application of said cuts.
- the wood pieces to be glued to each other thereafter for obtaining a wood unit in the form of a glued high quality wood product may in this way be produced while using simple means through a conven ⁇ tional cutting equipment without any special demands on saw blades being obliquely positioned or the like.
- the invention is applicable to starting wood pieces having sides extending parallel to the fibres as well as to the centre or core, said cuts being substantially parallel to said diagonal plane then being applied substantially in parallel with the fibre direc- tion and the center axis of the starting wood piece, respectively.
- All the wood pieces resulting from said cuts are then getting glue surfaces matching and brought together and which may be glued to each other for obtaining wood units in the form of high quality glued wood product, in which the wood pieces resulting from the cuts applied farthest away from said diagonal plane and having a cross-section of a right angled triangle as well as the wood pieces resulting from the cuts applied closer to said diagonal plane, which have four or six corners (when they are formed by two cuts located on both sides of said diagonal plane), makes it possible to obtain such high quality glued wood products without any requirement of any further dividing or ma ⁇ terial removal before gluing.
- a further preferred embodiment of the invention relates to a method in which two substantially equal wood pieces obtained by applying said cuts and having the cross-section shape of a right angled triangle with the hypotenuse formed by a said cut are glued to each other with the surface of the respective wood piece resulting from the respective cut as glue surface while forming a wood unit having a substantially rectangular cross- section.
- Surface near wood may in this way be utilised for ob ⁇ taining a glued wood product having a high quality, which in that case will have annular rings standing towards the surfaces thereof.
- two of said cuts are applied on the same side of said diagonal plane so that a wood piece having a substantially trapezoidal cross-section is obtained, whereupon four wood pieces so ob ⁇ tained are glued to each other with the opposite surfaces of the respective wood piece extending obliquely with respect to each other as gluing surfaces with the parallel sides of the respective wood piece orientated substantially perpendicularly to corre ⁇ sponding sides of an adjacent wood piece while forming a wood unit having a substantially rectangular outer cross-section and an inner longitudinal hollow space having a substantial rectangular cross-section.
- a high quality wood unit having a very large outer cross-section with respect to the cross-section with respect to the wood pieces being parts thereof may be obtained in this way, and said wood unit will also have wear resistant surfaces thanks to the annular rings standing there- against.
- Fig. 1 shows schematically how different cuts are applied on a starting wood piece in a method according to a pre ⁇ ferred embodiment of the invention
- Fig. 2 shows a cross-section of a wood unit produced by a method according to the invention
- Fig. 3 is a perspective view of a wood unit produced by glu ⁇ ing a plurality of wood units according to Fig. 2 to each other,
- Fig. 4 is a wood unit produced according to a method accord ⁇ ing to the invention.
- Fig. 5 illustrates schematically how wood pieces resulting from the division according to the invention may be glued to each other to form wood units
- Fig. 6 shows a cross-section of a wood unit produced through a method according to the invention
- Fig. 7 shows a cross-section of a wood unit produced ac ⁇ cording to a further method according to the invention
- Fig. 8 illustrates schematically how a wood piece obtained by the division shown in Fig. 1 may be divided further into two pieces which may be glued to each other for obtaining a wood unit
- Fig. 9 is a view corresponding to Fig. 1 with cuts applied on a rectangular starting wood piece having adjacent sides of different lengths, and
- Fig. 10 is a cross-section of a wood unit produced through a method according to the invention.
- a log which has been divided for obtain ⁇ ing a starting wood piece 1 having a substantially square cross- section and with the center of the log extending substantially through the center of the square forming the cross-section of the starting wood piece, may be cut by applying different cuts 2, 3, 4, 5 substantially in parallel with a diagonal plane extending from one corner 6 to another corner 7 of said square.
- a starting wood piece 1 is then preferably put with said diagonal extend ⁇ ing vertically when the cuts 2-5 are applied, so that conven ⁇ tional cutting equipment may easily be utilised, without any re- quirement of obliquely orientated saw blades or the like.
- the invention comprises the application of such cuts at any distances from said diagonal plane and in any num ⁇ ber for one and the same starting wood piece 1.
- the wood pieces 8-12 resulting in this way from the application of the cuts 2, 3, 4 and 5 may be glued to other wood pieces obtained in a similar way, which may be obtained from one or several other starting wood pieces or from the same starting wood piece 1.
- Fig. 2 It is illustrated in Fig. 2 how two wood pieces 8, 12 obtained through cuts 2, 5 applied on a starting wood piece farthest away from said diagonal plane may be glued to each other with a surface resulting from a respective cut against the respective wood piece as glue surface while forming a wood unit 13 having a substantially rectangular, in this case a square cross-section, since the starting wood piece has a square cross-section.
- This wood unit will command a comparatively high price, in particu ⁇ lar when having in mind that it may be obtained entirely from surface near wood, since it will be resistant to wear with the annual rings standing towards all surfaces.
- a plurality of wood units 13 may be put side by side and glued together for obtaining a composed glued wood product 26 in the form of a glued-joint sheet having a longitudinal substantially rectangular cross-section.
- FIG. 4 Another wood unit 14, which may be produced by gluing wood pieces of the same type as the wood piece 9 and 11 in Fig. 1 , is shown in Fig. 4. Thus, it is obtained by applying two such cuts on the same side of said diagonal plane, so that a wood piece 9 having a substantial trapezoidal cross-section is obtained, whereupon four wood pieces so obtained are glued to each other with the opposite surfaces 15 of the respective wood piece extending obliquely with respect to each other as gluing surfaces with the parallel sides of the respective wood piece substantially perpendicularly orientated with respect to the cor ⁇ responding sides of the adjacent wood pieces.
- a wood unit having a substantially square outer cross-section with an inner longitudinal hollow space 16 having a substantially square cross-section is formed in this way.
- This wood unit has also an- nual rings standing substantially towards the outer surfaces thereof and in addition thereto a high quality glued wood prod ⁇ uct having a comparatively large outer cross-section may be obtained from comparatively little material.
- FIG. 5 A further example of how wood pieces 9 of the type included in the wood unit according to Fig. 4 may be glued to each other for obtaining high quality glued wood products is shown in Fig. 5.
- Fig. 5 it is possible to turn the corresponding of the parallel surfaces of two equal such wood pieces 9 towards each other and to glue such a couple of wood pieces 9 to the couple hav ⁇ ing the opposite surfaces turned towards each other in the way shown in Fig. 5.
- This may be repeated a desired number of times by alternating the directions of the surface pieces in this way for obtaining a glued wood unit having annual rings stand- ing substantially towards large surfaces thereof.
- a composed wood unit 18 by gluing wood pieces of the same type as the wood pieces 1 and 12 in Fig. 1 to each other, so that a wood unit having a longitudinal rectangular cross-section is obtained, which has annual rings standing towards the large sides 19 thereof.
- two such wood pieces 11 having a substantial trapezoidal cross-section are glued to each other with the short and parallel sides against each other, wherein a wood piece 12 having a cross-section of a right angled triangle is glued into the respective V-shaped slot so formed, so that the hypotenuse of the respective cross-section triangle will form one side of said elongated rectangular cross-section.
- a wood piece obtained in the way according to the invention having a substantially trapezoidal cross-section may be divided further by applying cuts 24 sub ⁇ stantially perpendicularly to the two parallel sides, whereupon for one of the wood pieces so obtained end is shifted for end and these are then glued together to each other for obtaining a wood unit 25 having a substantially rectangular cross-section and annual rings standing towards the surfaces thereof.
- Figs. 9 and 10 It is illustrated in Figs. 9 and 10 how the method according to the invention may be applied to a starting wood piece having a rectangular cross-section with adjacent sides of different lengths by applying the three cuts 26-28 substantial in parallel with a diagonal (corresponding to the cut 26) of a cross-section rectangle and gluing the wood pieces 29-32 so resulted to the wood unit 34 according to Fig. 10.
- This will, besides the fact that it has annual rings standing towards the large sides thereof, have an inner elongated hollow space 33 having a parallelogram-shaped cross-section, which means an increase of the area inscribed by the outer contour of the cross-section.
- the methods according to the invention comprises fibre parallel as well as center parallel cutting, so that the definition "cuts are applied in the longitudinal direction of the starting wood piece substantially in parallel with a diago ⁇ nal plane" in the patent claims also comprises such fibre paral ⁇ lel cutting, in which said cuts extend along lines being in paral ⁇ lel with a diagonal line running from one corner to another in each cross-section plane, although the surfaces formed in real- ity by the cutting will not be completely parallel to said diagonal plane.
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Architecture (AREA)
- Wood Science & Technology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96902547A EP0873225A1 (en) | 1995-02-02 | 1996-02-01 | A method for dividing a log and for producing a composed wood unit |
AU46813/96A AU4681396A (en) | 1995-02-02 | 1996-02-01 | A method for dividing a log and for producing a composed wood unit |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9500377A SE9500377D0 (en) | 1995-02-02 | 1995-02-02 | Manufacture of glued wood products |
SE9500377-8 | 1995-02-02 | ||
SE9501916-2 | 1995-05-24 | ||
SE9501916A SE510494C2 (en) | 1995-02-02 | 1995-05-24 | Process for decomposing a log and for making a composite wood unit |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996023633A1 true WO1996023633A1 (en) | 1996-08-08 |
Family
ID=26662216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1996/000113 WO1996023633A1 (en) | 1995-02-02 | 1996-02-01 | A method for dividing a log and for producing a composed wood unit |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0873225A1 (en) |
AU (1) | AU4681396A (en) |
CA (1) | CA2212179A1 (en) |
SE (1) | SE510494C2 (en) |
WO (1) | WO1996023633A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LT5083B (en) | 2002-04-17 | 2003-12-29 | Erowa Ag | Apparatus for clamping a work piece |
LT5383B (en) | 2006-01-27 | 2006-11-27 | Sergej Saveljev | Wood unit and method for manufacturing it |
ITPD20090124A1 (en) * | 2009-05-08 | 2010-11-09 | Gianni Prando | GOLDEN BEAM - LIGNEA CAVA TRAVE |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2159337A1 (en) * | 1971-11-30 | 1973-06-07 | Albert Rufle | METHOD AND DEVICE FOR MANUFACTURING SAW WOOD |
DE2404898A1 (en) * | 1974-02-01 | 1975-08-14 | Otto Kreibaum | Tree trunk wood plank production - employs triangular and rounded cut pieces for non-waste building purposes |
WO1993004826A1 (en) * | 1991-09-03 | 1993-03-18 | Knoerr Andrew | Backsawn timber production from radially sawn wedges |
WO1993008000A1 (en) * | 1991-10-16 | 1993-04-29 | Hammarstroem Lars | Method for reducing a log |
SE469880B (en) * | 1989-10-13 | 1993-10-04 | Lars Hammarstroem | Wooden unit and a process for its production |
-
1995
- 1995-05-24 SE SE9501916A patent/SE510494C2/en not_active IP Right Cessation
-
1996
- 1996-02-01 WO PCT/SE1996/000113 patent/WO1996023633A1/en not_active Application Discontinuation
- 1996-02-01 AU AU46813/96A patent/AU4681396A/en not_active Abandoned
- 1996-02-01 EP EP96902547A patent/EP0873225A1/en not_active Withdrawn
- 1996-02-01 CA CA002212179A patent/CA2212179A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2159337A1 (en) * | 1971-11-30 | 1973-06-07 | Albert Rufle | METHOD AND DEVICE FOR MANUFACTURING SAW WOOD |
DE2404898A1 (en) * | 1974-02-01 | 1975-08-14 | Otto Kreibaum | Tree trunk wood plank production - employs triangular and rounded cut pieces for non-waste building purposes |
SE469880B (en) * | 1989-10-13 | 1993-10-04 | Lars Hammarstroem | Wooden unit and a process for its production |
WO1993004826A1 (en) * | 1991-09-03 | 1993-03-18 | Knoerr Andrew | Backsawn timber production from radially sawn wedges |
WO1993008000A1 (en) * | 1991-10-16 | 1993-04-29 | Hammarstroem Lars | Method for reducing a log |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
LT5083B (en) | 2002-04-17 | 2003-12-29 | Erowa Ag | Apparatus for clamping a work piece |
LT5383B (en) | 2006-01-27 | 2006-11-27 | Sergej Saveljev | Wood unit and method for manufacturing it |
ITPD20090124A1 (en) * | 2009-05-08 | 2010-11-09 | Gianni Prando | GOLDEN BEAM - LIGNEA CAVA TRAVE |
Also Published As
Publication number | Publication date |
---|---|
AU4681396A (en) | 1996-08-21 |
SE9501916D0 (en) | 1995-05-24 |
SE510494C2 (en) | 1999-05-31 |
SE9501916L (en) | 1996-08-03 |
CA2212179A1 (en) | 1996-08-08 |
EP0873225A1 (en) | 1998-10-28 |
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