CA2212179A1 - 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 unitInfo
- Publication number
- CA2212179A1 CA2212179A1 CA002212179A CA2212179A CA2212179A1 CA 2212179 A1 CA2212179 A1 CA 2212179A1 CA 002212179 A CA002212179 A CA 002212179A CA 2212179 A CA2212179 A CA 2212179A CA 2212179 A1 CA2212179 A1 CA 2212179A1
- Authority
- CA
- Canada
- Prior art keywords
- wood
- section
- cuts
- piece
- cross
- 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.)
- Abandoned
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
Abstract
In a method for producing a wood unit composed by a plurality of wood pieces glued to each other it is started from at least one elongated wood piece (1) having a substantially rectangular cross section on which cuts (2, 3, 4, 5) are applied for obtaining a wood piece for said wood unit. Said cuts are applied in the longitudinal direction of the starting wood piece substantially in parallel with a diagonal plane extending from one (6) to another (7) corner of the rectangle forming the cross section of the starting wood piece, and a plurality of wood pieces resulting from such cuts are glued to each other by placing longitudinal surfaces thereof against each other for obtaining a composed wood unit.
Description
A method for dividing a log and for producing a composed 5 wood unit FIELD OF THE INVEI\ITION AND PRIOR ART
The present invenltion relates to a method for dividing a log ac-10 cording to the preamble of the appended patent claim 1 as wellas 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 15 wood piece for saiid wood unit.
"Rectalngular cross-section" is defined as a cross-section hav-ing four right-angled corners and does accordingly also com-prise c3 square cross-section.
A number of diffe!rent techniques for dividing a log are known, and it is usually proceeded in the way that a number of cuts paralle~l to each other are applied in the longitudinal direction of the log for gaining planks and boards from the log with a possi-25 ble intermediate treatment in an edging machine and/or planingmachirle. 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 gluedjoint sheets, pieces of furniture 30 and the like. Thus, the log is in a first line divided without ob-~ taining any degree of refinement of the products obtained. Fur-thermore, the main part of the surface near wood will normally ~ get lost with respect to the possibilities to use it for forming wood products of high quality and this wood is cut into chips.
35 The salme is valid for thinner log parts, which with the conven-CA 022l2l79 l997-08-Ol tional dividing technique only give rise to products of such a low quality that cutting thereof into chips is often the only realistic alternative.
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-10 tioned above of the log dividing methods according to the priorart 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 15 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.
These objects are according to the invention obtained by pro-viding the methods according to the appended independent patent claims.
25 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-30 section of the first wood piece, second wood pieces, which mayeasily 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 35 way. Besides the fact that the second wood pieces resulting in -CA 022l2l79 l997-08-Ol this way have sur~h cross-section shapes that they may easily be combined for l~btaining numerous wood products the inven-tional way of appllying the cuts means that these products may get very good properties by the fact that they will have a ten-5 dency to automatically have annual rings standing with respectto several suRace!s thereof, so that these surfaces will be very wear resistant.
Thank~s to the possibility to in this way remarkably raise the 10 quality of the wood products that may follow upon said dividing metho~, a greater part of the surface near wood and thin logs may through the invention be saved from the chips cutter and instead be used for producing wood products for which a con-siderably higher prize is set.
By the fact that in l~he method according to the invention for pro-ducing the wood l~nit composed by a plurality of wood pieces glued lo each other the cuts are applied in the longitudinal cdi-rection of the startiing wood piece substantially in parallel with a 20 diagonal plane extending between one corner and another cor-ner of the rectangle forming the cross-section of the starting wood piece and a plurality of wood pieces resulting from such cuts are glued to each other by applying longitudinal surfaces thereof against each other for obtaining a composed wood unit, 25 glued ~vood products having very good quality properties may be procluced throuqh very simple means, i.e. in a labour or work saving way, while ,~t the same time utilising the material of the starting wood piece. The invention comprises also that wood pieces resulting from such cuts, which are glued to each other 30 derive frorn different starting wood pieces.
Thus, it will according to the invention be possible to in one single line achieve division and direct production of refined glued wood produc:ts having good quality properties, although 35 the invention also comprises the possibility to glue the wood CA 022l2l79 l997-08-Ol pieces resulting from said cuts applied substantially in parallel with said diagonal plane to each other far later, maybe in an-other place.
5 According to a preferred embodiment of the method for produc-ing a composed wood unit 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 10 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-20 tion and the center axis of the starting wood piece, respectively.
All the wood pieces resulting from said cuts are then gettingglue surfaces matching and brought together and which may be glued to each other for obtaining wood units in the form of high 2~ 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 30 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.
Thus, a further preferred embodiment of the invention relates to a method in which two substantially equal wood pieces obtained by appllying said cuts and having the cross-section shape of a right angled trianglle with the hypotenuse formed by a said cut 5 are glued to each other with the surface of the respective wood pie~e resulting from the respective cut as glue surface while forming a wood unit having a substantially rectangular ~ross-section. Surface near wood may in this way be utilised for ob-taining a glued wood product having a high quality, which in that 10 case will have annular rings standing towards the surfaces thereof.
Accordiing to a fu~ther preferred embodiment of the invention two of said cuts are applied on the same side of said diayonal 15 plane so that a wood piece having a substantially trapezoidal cross-section is o~tained, whereupon four wood pieces so ob-tained are glued to each other with the opposite suRaces of the respective wood piece extending obliquely with respect to each other as gluing suflaces with the parallel sides of the respective 20 wood piece orientated substantially perpendicularly to corre-sponding sides of an adjacent wood piece while forming a wood unit ha~ring a subsl:antially rectangular outer cross-section and an inner longitudinal hollow space having a substantial rectangular cross-~iection. A high quality wood unit having a 2~ 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 Wcly, and said wood unit will also have wear resistant surfaces lhanks to the annular rings standing there-against.
Further advantages as well as advantageous features of the in-vention appear from the other dependent patent claims as well as the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the appended drawings, below follows a de-scription of preferred embodiments of the invention cited as ex-5 amples.
In the drawings:
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, 20 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, ~0 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 obtainin~ a wood unit, Fig. 9 is a vie~ corresponding to Fig. 1 with cuts applied on a rectangular starting wood piece having adjacent sides of different len~ths, and Fig. 10 is a cro~;s-section of a wood unit produced through a method according to the invention.
DETAII ED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE
INVENTION
It is illustrated in Fig. 1 how according to a preferred embodi-15 ment of 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, 20 3, 4, 'i substantiallly 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 app!ied, so that conven-tional cutting equipment may easily be utilised, without any re-25 quiremerlt of obliquely orientated saw blades or the like. It is emphasised that 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 30 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.
Some different possibilities to obtain high quality wood units from wood pieces so obtained will be shown in the following figures, but these are not in any way exhausting for the inven-tion. t e' It is illustrated in Fig. 2 how two wood pieces 8, 12 obtained 5 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, 10 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 en~irely from surface near wood, since it will be resistant to wear with the annual rings standing towards all sur~aces.
It is illustrated in Fig. 3 how 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 gluedjoint sheet having a longitudinal substantially rectangular cross-section.
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 25 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 30 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-35 nual rings standing substantially towards the outer surfaces thereof and in addition thereto a high quality glued wood prod-uct having a conlparatively large outer cross-section may be obtainled from cornparatively little material.
5 A furtlter 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 obtainling high quality glued wood products is shown in Fig. 5.
Thus, it is possilble to turn the corresponding of the parallel suRac:es of two e!qual such wood pieces 9 towards each other 10 and to glue such a couple of wood pieces 9 to the couple hav-ing th,e 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-15 ing substantially towards large surfaces thereof.
It is illustrated in Fig. 6 how it is possible to obtain a composedwood u~it 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 20 unit having a longitudinal rectangular cross-section is obtained, which has annual rings standing towards the large sides 19 thereof. Thus, two such wood pieces 11 having a substantial trapez:oidal cross--section are glued to each other with the short and p~arallel side~i against each other, wherein a wood piece 12 25 havin~g a cross-s~sction 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.
30 It is pointed out that it when it is stated that such a wood piece having a substantially trapezoidal cross-section is obtained by applying two cuts on the same side of said diagonal plane, this also comprises that one of the cuts is applied according to said diagonal plane.
It is illustrated in Fig. 7 how a wood unit 20 having an octagonal cross-section may be obtained by gluing wood pieces of the same type as the wood piece 10 in Fig. 1 to each other, i.e. by gluing wood pieces obtained by applying cuts on both sides of 5 said diagonal plane, which have an hexagonal cross section, to each other with a surface 22 adjacent to the respective right angled corner 21 as gluing suRace of each wood piece against adjacent wood pieces and with the parallel sides of the respec-tive wood piece substantially perpendicularly directed towards 10 the corresponding sides of the adjacent wood pieces while forming a wood unit having an octagonal outer cross-section with an inner elongated hollow space 23 having a substantially square cross-section. This wood unit will have the same advan-tages with respect to "cross-section gain" and wear resistance 15 in the form of annual rings standing towards the outer surfaces thereof as the wood unit illustrated in Fig. 4.
It is illustrated in Fig. 8 how a wood piece obtained in the way according to the invention having a substantially trapezoidal 20 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 25 and annual rings standing towards the surfaces thereof.
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 30 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 35 thereo~, have an inner elongated hollow space 33 having a W O 96/23633 PCT~SE96/00113 parallelogram-shaped cross-section, which means an increase of the area inscribed by l:he outer contour of the cross-section.
Thus, through the dividing or disintegrating method according to 5 the invention divicling according to cuts in parallel with said di-agonal plane and gluing wood pieces SG obtained to each other is realised in one single production line for obtaining a glued wood product having a remarkable degree of refinement already in connection with the division of a log. This may primarily be 10 obtainled by the falct that the wood pieces resulting from the di-vision according to the invention have such shapes that they are easy to glue to each other while being pressed against each other. The strong raise of quality of the glued wood products is fu~hermore ensured by the special orientation that these sur-15 faces will get with respect to the respective annual rings.
It is emphasised that the methods according to the inventioncomprises fibre parallel as well as center parallel cutting, so that the definition "cuts are applied in the longitudinal direction 20 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 whic:h 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-25 ity by the cutting will not be completely parallel to said diagonalplane.
The invention is of course not in any way restricted to the pre-ferred embodiments described above, but several possibilities 30 to modifications thereof would be apparent to a man skilled in the art without departing from the basic idea of the invention.
.,
The present invenltion relates to a method for dividing a log ac-10 cording to the preamble of the appended patent claim 1 as wellas 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 15 wood piece for saiid wood unit.
"Rectalngular cross-section" is defined as a cross-section hav-ing four right-angled corners and does accordingly also com-prise c3 square cross-section.
A number of diffe!rent techniques for dividing a log are known, and it is usually proceeded in the way that a number of cuts paralle~l to each other are applied in the longitudinal direction of the log for gaining planks and boards from the log with a possi-25 ble intermediate treatment in an edging machine and/or planingmachirle. 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 gluedjoint sheets, pieces of furniture 30 and the like. Thus, the log is in a first line divided without ob-~ taining any degree of refinement of the products obtained. Fur-thermore, the main part of the surface near wood will normally ~ get lost with respect to the possibilities to use it for forming wood products of high quality and this wood is cut into chips.
35 The salme is valid for thinner log parts, which with the conven-CA 022l2l79 l997-08-Ol tional dividing technique only give rise to products of such a low quality that cutting thereof into chips is often the only realistic alternative.
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-10 tioned above of the log dividing methods according to the priorart 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 15 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.
These objects are according to the invention obtained by pro-viding the methods according to the appended independent patent claims.
25 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-30 section of the first wood piece, second wood pieces, which mayeasily 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 35 way. Besides the fact that the second wood pieces resulting in -CA 022l2l79 l997-08-Ol this way have sur~h cross-section shapes that they may easily be combined for l~btaining numerous wood products the inven-tional way of appllying the cuts means that these products may get very good properties by the fact that they will have a ten-5 dency to automatically have annual rings standing with respectto several suRace!s thereof, so that these surfaces will be very wear resistant.
Thank~s to the possibility to in this way remarkably raise the 10 quality of the wood products that may follow upon said dividing metho~, a greater part of the surface near wood and thin logs may through the invention be saved from the chips cutter and instead be used for producing wood products for which a con-siderably higher prize is set.
By the fact that in l~he method according to the invention for pro-ducing the wood l~nit composed by a plurality of wood pieces glued lo each other the cuts are applied in the longitudinal cdi-rection of the startiing wood piece substantially in parallel with a 20 diagonal plane extending between one corner and another cor-ner of the rectangle forming the cross-section of the starting wood piece and a plurality of wood pieces resulting from such cuts are glued to each other by applying longitudinal surfaces thereof against each other for obtaining a composed wood unit, 25 glued ~vood products having very good quality properties may be procluced throuqh very simple means, i.e. in a labour or work saving way, while ,~t the same time utilising the material of the starting wood piece. The invention comprises also that wood pieces resulting from such cuts, which are glued to each other 30 derive frorn different starting wood pieces.
Thus, it will according to the invention be possible to in one single line achieve division and direct production of refined glued wood produc:ts having good quality properties, although 35 the invention also comprises the possibility to glue the wood CA 022l2l79 l997-08-Ol pieces resulting from said cuts applied substantially in parallel with said diagonal plane to each other far later, maybe in an-other place.
5 According to a preferred embodiment of the method for produc-ing a composed wood unit 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 10 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-20 tion and the center axis of the starting wood piece, respectively.
All the wood pieces resulting from said cuts are then gettingglue surfaces matching and brought together and which may be glued to each other for obtaining wood units in the form of high 2~ 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 30 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.
Thus, a further preferred embodiment of the invention relates to a method in which two substantially equal wood pieces obtained by appllying said cuts and having the cross-section shape of a right angled trianglle with the hypotenuse formed by a said cut 5 are glued to each other with the surface of the respective wood pie~e resulting from the respective cut as glue surface while forming a wood unit having a substantially rectangular ~ross-section. Surface near wood may in this way be utilised for ob-taining a glued wood product having a high quality, which in that 10 case will have annular rings standing towards the surfaces thereof.
Accordiing to a fu~ther preferred embodiment of the invention two of said cuts are applied on the same side of said diayonal 15 plane so that a wood piece having a substantially trapezoidal cross-section is o~tained, whereupon four wood pieces so ob-tained are glued to each other with the opposite suRaces of the respective wood piece extending obliquely with respect to each other as gluing suflaces with the parallel sides of the respective 20 wood piece orientated substantially perpendicularly to corre-sponding sides of an adjacent wood piece while forming a wood unit ha~ring a subsl:antially rectangular outer cross-section and an inner longitudinal hollow space having a substantial rectangular cross-~iection. A high quality wood unit having a 2~ 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 Wcly, and said wood unit will also have wear resistant surfaces lhanks to the annular rings standing there-against.
Further advantages as well as advantageous features of the in-vention appear from the other dependent patent claims as well as the following description.
BRIEF DESCRIPTION OF THE DRAWINGS
With reference to the appended drawings, below follows a de-scription of preferred embodiments of the invention cited as ex-5 amples.
In the drawings:
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, 20 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, ~0 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 obtainin~ a wood unit, Fig. 9 is a vie~ corresponding to Fig. 1 with cuts applied on a rectangular starting wood piece having adjacent sides of different len~ths, and Fig. 10 is a cro~;s-section of a wood unit produced through a method according to the invention.
DETAII ED DESCRIPTION OF PREFERRED EMBODIMENTS OF THE
INVENTION
It is illustrated in Fig. 1 how according to a preferred embodi-15 ment of 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, 20 3, 4, 'i substantiallly 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 app!ied, so that conven-tional cutting equipment may easily be utilised, without any re-25 quiremerlt of obliquely orientated saw blades or the like. It is emphasised that 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 30 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.
Some different possibilities to obtain high quality wood units from wood pieces so obtained will be shown in the following figures, but these are not in any way exhausting for the inven-tion. t e' It is illustrated in Fig. 2 how two wood pieces 8, 12 obtained 5 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, 10 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 en~irely from surface near wood, since it will be resistant to wear with the annual rings standing towards all sur~aces.
It is illustrated in Fig. 3 how 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 gluedjoint sheet having a longitudinal substantially rectangular cross-section.
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 25 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 30 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-35 nual rings standing substantially towards the outer surfaces thereof and in addition thereto a high quality glued wood prod-uct having a conlparatively large outer cross-section may be obtainled from cornparatively little material.
5 A furtlter 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 obtainling high quality glued wood products is shown in Fig. 5.
Thus, it is possilble to turn the corresponding of the parallel suRac:es of two e!qual such wood pieces 9 towards each other 10 and to glue such a couple of wood pieces 9 to the couple hav-ing th,e 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-15 ing substantially towards large surfaces thereof.
It is illustrated in Fig. 6 how it is possible to obtain a composedwood u~it 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 20 unit having a longitudinal rectangular cross-section is obtained, which has annual rings standing towards the large sides 19 thereof. Thus, two such wood pieces 11 having a substantial trapez:oidal cross--section are glued to each other with the short and p~arallel side~i against each other, wherein a wood piece 12 25 havin~g a cross-s~sction 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.
30 It is pointed out that it when it is stated that such a wood piece having a substantially trapezoidal cross-section is obtained by applying two cuts on the same side of said diagonal plane, this also comprises that one of the cuts is applied according to said diagonal plane.
It is illustrated in Fig. 7 how a wood unit 20 having an octagonal cross-section may be obtained by gluing wood pieces of the same type as the wood piece 10 in Fig. 1 to each other, i.e. by gluing wood pieces obtained by applying cuts on both sides of 5 said diagonal plane, which have an hexagonal cross section, to each other with a surface 22 adjacent to the respective right angled corner 21 as gluing suRace of each wood piece against adjacent wood pieces and with the parallel sides of the respec-tive wood piece substantially perpendicularly directed towards 10 the corresponding sides of the adjacent wood pieces while forming a wood unit having an octagonal outer cross-section with an inner elongated hollow space 23 having a substantially square cross-section. This wood unit will have the same advan-tages with respect to "cross-section gain" and wear resistance 15 in the form of annual rings standing towards the outer surfaces thereof as the wood unit illustrated in Fig. 4.
It is illustrated in Fig. 8 how a wood piece obtained in the way according to the invention having a substantially trapezoidal 20 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 25 and annual rings standing towards the surfaces thereof.
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 30 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 35 thereo~, have an inner elongated hollow space 33 having a W O 96/23633 PCT~SE96/00113 parallelogram-shaped cross-section, which means an increase of the area inscribed by l:he outer contour of the cross-section.
Thus, through the dividing or disintegrating method according to 5 the invention divicling according to cuts in parallel with said di-agonal plane and gluing wood pieces SG obtained to each other is realised in one single production line for obtaining a glued wood product having a remarkable degree of refinement already in connection with the division of a log. This may primarily be 10 obtainled by the falct that the wood pieces resulting from the di-vision according to the invention have such shapes that they are easy to glue to each other while being pressed against each other. The strong raise of quality of the glued wood products is fu~hermore ensured by the special orientation that these sur-15 faces will get with respect to the respective annual rings.
It is emphasised that the methods according to the inventioncomprises fibre parallel as well as center parallel cutting, so that the definition "cuts are applied in the longitudinal direction 20 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 whic:h 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-25 ity by the cutting will not be completely parallel to said diagonalplane.
The invention is of course not in any way restricted to the pre-ferred embodiments described above, but several possibilities 30 to modifications thereof would be apparent to a man skilled in the art without departing from the basic idea of the invention.
.,
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method for dividing a log comprising a first step of applying two couples of cuts in the longitudinal direction of the log, the cuts belonging to the same couple being separated and extending substantially in parallel with each other with respect to their extension in the cross-section of the log and substantially perpendicularly to the cuts belonging to the other couple for obtaining an elongated first wood piece (1) having a substantially rectangular cross-section, characterized in that the division comprises a second step in which said first wood piece is divided into a plurality of second wood pieces (8-12, 29-32) by applying cuts (2-5, 26-28) thereon in the longitudinal direction thereof substantially in parallel with a diagonal plane extending from one corner (6) to another (7) of the rectangle forming the cross-section of the first wood piece.
2. A method according to claim 1, characterized in that said cuts belonging to one and the same couple are applied at substantially the same distance from the center of the log.
3. A method for producing a wood unit composed by a plurality of wood pieces glued to each other, in which it is started form at least one elongated wood piece (1) having a substantially rectangular cross-section, on which cuts (2-5, 26-28) are applied for obtaining wood pieces (8-12, 29-32) for said wood unit, characterized in that said cuts are applied in the longitudinal direction of the starting wood piece substantially in parallel with a diagonal plane extending from one corner (6) to another (7) of the rectangle forming the cross-section of the starting wood piece, and a plurality of wood pieces resulting from such cuts are glued to each other by applying longitudinal surfaces thereof against each other for obtaining a composed wood unit (13, 14, 17, 18, 20, 25, 26, 34).
4. A method according to claim 3, characterized in that said cuts (2-5, 26-28) are applied on a wood piece (1) forming the center yield of a log with the center located substantially in the middle of said cross-section rectangle.
5. A method according to claim 3 or 4, characterized in that the starting wood piece (1) is put with said diagonal plane arranged substantially vertically, and that the starting wood piece is kept in this position during the application of said cuts.
6. A method according to claim 4 or 5, characterized in that it is started from at least an elongated wood piece (1) having a substantially rectangular cross-section tapering in the longitudinal direction of said piece from one end to the other thereof with the longitudinal sides extending substantially in parallel with the fibre direction of said piece, and that said cuts (2-5, 26-28) are applied substantially in parallel with said fibre direction.
7. A method according to claim 4 or 5, characterized in that it is started from at least one elongated wood piece (1) having a substantially rectangular cross-section being substantially unchanged along the longitudinal direction of said piece, and that said cuts (2-5, 26-28) are applied substantially in parallel with the central axis of said piece.
8. A method according to any of claims 3-7, characterized in that two substantially equal wood pieces (8, 12) obtained through the application of said cuts (2, 5) and having a cross-section shape of a right angled triangle with the hypotenuse formed by one said cut (2, 5) are glued to each other with the surface of the respective wood piece resulting from the respective cut as gluing surface while forming a wood unit (13) having a substantially rectangular cross-section.
9. A method according to claim 8, characterized in that a plurality of wood units (13) so obtained are laid next to each other and are glued together while forming a composed sheet-like wood unit (26) having a cross-section of an elongated rectangle.
10. A method according to any of claims 3-7, characterized in that two of said cuts (2, 3 or 4, 5) are applied on the same side of said diagonal plane, so that a wood piece (9, 11) having a substantially trapezoidal cross-section is obtained, and that 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 orientated substantially perpendicularly to corresponding sides of an adjacent wood piece while forming a wood unit (14) having a substantially rectangular outer cross-section and an inner longitudinal hollow space (16) having a substantial rectangular cross-section.
11. A method according to any of claims 3-7, characterized in that one of said cuts (3, 4) is applied from both sides of said diagonal plane while obtaining a wood piece (10) having a hexagonal cross-section, and that four substantially equal such wood pieces are glued to each other with the surface (22) close to the respective right angled corners as gluing surface of each wood piece against adjacent wood pieces and with the parallel sides of the respective wood piece orientated substantially perpendicularly to the corresponding sides of the adjacent wood piece while forming a wood unit (20) having an octagonal outer cross-section with an inner longitudinal hollow space (23) having a substantially rectangular cross-section.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9500377-8 | 1995-02-02 | ||
| SE9500377A SE9500377D0 (en) | 1995-02-02 | 1995-02-02 | Manufacture of glued wood products |
| 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 |
|---|---|
| CA2212179A1 true CA2212179A1 (en) | 1996-08-08 |
Family
ID=26662216
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002212179A Abandoned CA2212179A1 (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) |
Families Citing this family (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 |
Family Cites Families (4)
| 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 |
| 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 |
| SE9103009L (en) * | 1991-10-16 | 1993-04-17 | Lars Hammarstroem | PROCEDURE FOR REDUCING A STOCK |
-
1995
- 1995-05-24 SE SE9501916A patent/SE510494C2/en not_active IP Right Cessation
-
1996
- 1996-02-01 CA CA002212179A patent/CA2212179A1/en not_active Abandoned
- 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 WO PCT/SE1996/000113 patent/WO1996023633A1/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| SE9501916D0 (en) | 1995-05-24 |
| EP0873225A1 (en) | 1998-10-28 |
| AU4681396A (en) | 1996-08-21 |
| WO1996023633A1 (en) | 1996-08-08 |
| SE9501916L (en) | 1996-08-03 |
| SE510494C2 (en) | 1999-05-31 |
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| EEER | Examination request | ||
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