CA2034024C - Wooden structure, and a roller press for producing the structure - Google Patents
Wooden structure, and a roller press for producing the structure Download PDFInfo
- Publication number
- CA2034024C CA2034024C CA 2034024 CA2034024A CA2034024C CA 2034024 C CA2034024 C CA 2034024C CA 2034024 CA2034024 CA 2034024 CA 2034024 A CA2034024 A CA 2034024A CA 2034024 C CA2034024 C CA 2034024C
- Authority
- CA
- Canada
- Prior art keywords
- roller
- rollers
- press
- frame
- pieces
- 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 - Fee Related
Links
- 238000003825 pressing Methods 0.000 claims description 12
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000003292 glue Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 210000002105 tongue Anatomy 0.000 abstract description 10
- 239000002023 wood Substances 0.000 description 8
- 239000004020 conductor Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 210000001145 finger joint Anatomy 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 101100276976 Drosophila melanogaster Drak gene Proteins 0.000 description 1
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- FHIVAFMUCKRCQO-UHFFFAOYSA-N diazinon Chemical compound CCOP(=S)(OCC)OC1=CC(C)=NC(C(C)C)=N1 FHIVAFMUCKRCQO-UHFFFAOYSA-N 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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
- E04C3/127—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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
Abstract
The invention relates to an elongated wooden structure and a roller press for producing the structure. The wooden structure consists of four pieces joined together and extending from end to end of the structure, said pieces having uniform dimensions in both the transverse and longitudinal directions and an essentially rectangular cross section, the joint surfaces of said pieces being provided with jointing grooves and corresponding tongues. The roller press comprises at least one four-roller unit in which the axes of rotation of all four rollers are located in one plane perpendicular to the longitudinal direction of the object to be pressed.
Description
WOODEN STRUCTURE, AND A ROLLER PRESS
FOR PRODUCING THE STRUCTURE
The present invention relates to an elongated wooden structure, and to a roller press designed for the production of the elongated wooden structures.
US patent publication 4,399,409 proposes an elongated wooden structure consisting of four pieces of a sectorial cross-sectional form which, when glued together, form a tubular beam of a square cross-section.
At present, as the numbers of massive tree trunks are decreasing, saw mills are receiving increasing numbers of trunks of a small diameter, from which it is not always possible to produce sawn timber of sufficient size. In the above-mentioned US patent, this is achieved by sawing the wood into pieces of a triangular cross-section which are then joined together to produce larger bodies. However, such a structure has the drawback that the wood has to be sawn expressly for this purpose, whereas normally the wood is sawn into pieces of a rectangular cross-section.
Previously known are also different tubular structures made of boards joined using various, generally metallic holding means, e.g., nails or angle iron fasteners.
However, such structures are difficult and expensive to manufacture industrially, and their strength is generally of a low order.
The object of the invention is to eliminate the drawbacks referred to and to achieve a wooden structure which can be easily assembled from essentially rectangular pieces and is well suited for industrial production. Another object of the invention is to create a roller press designed for industrial production of the wooden structure of the invention.
As for the features characteristic of the invention, reference is made to the claims.
According to one aspect of the invention, there is provided an elongated wooden structure consisting of four pieces each of a substantially constant, rectangular cross-section, which are joined together and extend from one end of the structure to the other, each piece being provided with at least one jointing groove extending along a broad side thereof from end to end, proximate to a first narrow side of the piece while a second narrow side thereof is provided with at least one tongue arranged to engage complementarily with a corresponding groove in the adjacent, perpendicularly arranged piece, so that the four pieces are joined together to form a hollow, tubular structure.
Said pieces are preferably fully identical in cross-sectional form, so that they can be manufactured using the same cutter construction. The resulting wooden structure is a tubular body of a square cross-section.
In another embodiment of the invention, the structure is of a rectangular cross-sectional form, in which case the pieces on opposite sides are identical and the structure can be used as a beam of either flat or elevated cross-section, depending on practical requirements.
The structure of the invention has many advantages over previously-known wooden structures. It can be made of the lower-quality, rough-edged surface boards that are always produced in the sawing of timber, because the rough-edge sides can be hidden inside the structure if the boards are correctly planed. In this way, it is also possible to produce completely knotless wooden structures from surface boards.
The structure is easy to produce in a continuous process because, due to the strength of the structure, successive pieces can be glued together end to end using only butted joints or, if desirable, finger joints.
The structure is symmetrical and rigid. It does not bend like beams made of solid wood. Also, the structure requires less and lower-quality wood material than corresponding solid-wood timber with the same strength properties.
Further advantages over thicker timber are that the pieces will dry faster and require less drying energy, and that they can be better and more quickly impregnated, if necessary.
The wooden structure of the invention can be used, e.g., in the skeletal structures of buildings, in various load-bearing structures, door frames, fence poles, table legs, etc. Moreover, the cavity inside the structure can be used as a duct for the mounting of electrical and other conductors and piping.
When elongated bodies of a rectangular cross-sectional form are manufactured by joining several pieces together by pressing and glueing, problems are frequently caused by the uneven and obliquely directed pressure loads resulting from the relative positions of the pressing rollers, with the consequence that the obliquely directed forces applied to the pieces may damage the tongues and grooves or equivalent provided on the pieces.
On the other hand, if the pressing rollers are exactly aligned, problems are encountered in the adjustment of the rollers, because the same press must be able to press different-sized pieces of a rectangular or square cross-section.
To eliminate the problems mentioned above, there is provided according to a further aspect of the invention, a roller press specially adapted for the manufacture of elongated wooden structures according to said one aspect of the invention and comprising at least one four-roller unit for pressing said elongated body of a rectangular cross-sectional form from all four sides, in which unit the shafts of the first and third rollers are parallelly positioned relative to each other and the rollers are on opposite sides of the body to be pressed, applying a pressure on its surfaces, and the shafts of the second and fourth rollers are parallelly positioned relative to each other, and the rollers are placed on opposite sides of the body to be pressed, applying a pressure on its surfaces, the axes of rotation of all four rollers being located in one plane perpendicular to the longitudinal direction of the body to be pressed, the first roller being fixedly mounted with bearings on the frame of the press and the second and third rollers being arranged to be immovable relative to each other in the direction of the axis of the first roller but movable together in this same direction, while the third and fourth rollers are arranged to be immovable relative to each other in the direction of the axis of the second roller but movable together in this same direction.
Thus, the basic idea of the roller press of the invention is that, while one roller is fixedly mounted, the other three rollers can be moved in pairs relative to the fixed roller in such manner that the second and third rollers form a pair that moves only in the direction of the shaft of the first roller, whereas the third and fourth rollers form a pair that moves only in a direction perpendicular to the shaft of the first roller, the shafts of all four rollers being located in the same plane perpendicular to the longitudinal direction of the body to be pressed. Moreover, the rollers are placed at some distance from each other so that they can move without touching each other during adjustment of the opening size of the press.
The roller press preferably comprises several four-roller units rigidly connected to each other in such manner that the above-mentioned adjustments regarding rollers pressing against the same surface of the body take place simultaneously.
The other embodiments and features of the construction of the roller press of the invention are as stated in the claims and in the explanation of the appended drawings.
Compared to previously knoo:n presses, the roller press of the invention has the advantage that the 5 pressure is applied to the body to be pressed in exactly one plane perpendicular to id's longitudinal direction, so that the pieces to be joined are not subjected to any forces that may damage or twist their jointing:
parts. An additional advantage is the ease and vaxa.ety l0 of adjustments provided in spite of the roller lay-out described above.
In the following, the invention is 'described by way of example without restricting 'it in any way, reference being made to the drak~ing attached, wherein:
Fig. 1 presents a diagran of an embodiment of the roller press of the invention in section.
Fig. 2 presents the press components moving along with rollers 2 and 3.
Fig. 3 presents the press components-moving along with rollers 3 and 4.
Fig. 4 presents a part of a roller: press consisting of several units.
Fic~. 5 shows the cross section of an embodiment of the wooden structure of the invention.
Fig. 6 shows the cross section of another embodiment of the wooden structure of the invention:
The roller press shown in-Fig. 1 comprises four cylindrical rollers 1, 2, 3, 9, which are'sa arranged that the shafts 5 and 7 of rollers 1 and 3 are parallel to each other while the shafts 6 and 8 of rollers 2 and 4 are parallel to each other and perpendicular to shafts 5 and 7, leaving a rectangular opening in the middle of the rollers:
The shaft 5 of the Pirst roller 1 is fixedly mounted with bearings on the press frame 9. Attached to the frame is also a power means 16 for rotating the roller i. Thus; he roller cannot move axially relative V1'O 9/01092 PCT/F189/00140 a~~~~'~i~~
to the frame 9, but only rotate while remaining in place. The roller press is provided with an auxiliary frame 10 which is mounted with slide rails 11 on the press frame 9 and is movable in a direction perpendicular to the longitudinal direction of the object to be pressed, i.e, in the direction of the shafts 6 and 8. The shaft 8 of the fourth roller 4 is fixedly mounted with bearings on the auxiliary frame, ~ohich is also provided with a power means 17 for rotating the roller 4.
The auxiliary frame 10 is provided with a vertical support 18 which lies parallel to shafts 5 and 7 and carries an additional frame 12 movable along the vertical support and supporting the third roller 3, which is rigidly attached to a rota~.able shaft 7 mounted on the additional frame 12~.~At the upper end of the vertical support 18 is a sliding holder 13 which surrounds a sleeve l4 mounted on the shaft 6 of the second roller 2, parallel to shafts 6 and 8. The roller 2 is attached to shaft 6, which is rotatatable inside the sleeve 14 supporting it. The shaft end pointing away from the roller 2 is guided by a guide. track l5 attached to the frame 9, in such manner that the shaft -6 is allowed to slide in a direction perpendicular to itself, i.e, in the direction of shafts 5 and 7, but not in the direction of shafts 6 and 8.
R''ith the rollers arranged and connected in this way, rollers 2 and 3 can be moved as a rigid unit, shown in Fig. 2, in the direction of shafts 5 and 7 as indicated by the arrowwl9. In this case, rollers 1 and 4 remain in place and the height of ~the,opening of the press, i.g. the distance between rollers 2 and 4, is changed while the wridth, i.e. the distance between rollers 1 and 3, remains unchanged.
Fig. 3 represents the auxiliary frame 10, the roller 4 fixedly mounted on it; and the roller 3 supported on it by means of the additional frame 12.
W'O 90/01092 PCT/F189/OOlgO
FOR PRODUCING THE STRUCTURE
The present invention relates to an elongated wooden structure, and to a roller press designed for the production of the elongated wooden structures.
US patent publication 4,399,409 proposes an elongated wooden structure consisting of four pieces of a sectorial cross-sectional form which, when glued together, form a tubular beam of a square cross-section.
At present, as the numbers of massive tree trunks are decreasing, saw mills are receiving increasing numbers of trunks of a small diameter, from which it is not always possible to produce sawn timber of sufficient size. In the above-mentioned US patent, this is achieved by sawing the wood into pieces of a triangular cross-section which are then joined together to produce larger bodies. However, such a structure has the drawback that the wood has to be sawn expressly for this purpose, whereas normally the wood is sawn into pieces of a rectangular cross-section.
Previously known are also different tubular structures made of boards joined using various, generally metallic holding means, e.g., nails or angle iron fasteners.
However, such structures are difficult and expensive to manufacture industrially, and their strength is generally of a low order.
The object of the invention is to eliminate the drawbacks referred to and to achieve a wooden structure which can be easily assembled from essentially rectangular pieces and is well suited for industrial production. Another object of the invention is to create a roller press designed for industrial production of the wooden structure of the invention.
As for the features characteristic of the invention, reference is made to the claims.
According to one aspect of the invention, there is provided an elongated wooden structure consisting of four pieces each of a substantially constant, rectangular cross-section, which are joined together and extend from one end of the structure to the other, each piece being provided with at least one jointing groove extending along a broad side thereof from end to end, proximate to a first narrow side of the piece while a second narrow side thereof is provided with at least one tongue arranged to engage complementarily with a corresponding groove in the adjacent, perpendicularly arranged piece, so that the four pieces are joined together to form a hollow, tubular structure.
Said pieces are preferably fully identical in cross-sectional form, so that they can be manufactured using the same cutter construction. The resulting wooden structure is a tubular body of a square cross-section.
In another embodiment of the invention, the structure is of a rectangular cross-sectional form, in which case the pieces on opposite sides are identical and the structure can be used as a beam of either flat or elevated cross-section, depending on practical requirements.
The structure of the invention has many advantages over previously-known wooden structures. It can be made of the lower-quality, rough-edged surface boards that are always produced in the sawing of timber, because the rough-edge sides can be hidden inside the structure if the boards are correctly planed. In this way, it is also possible to produce completely knotless wooden structures from surface boards.
The structure is easy to produce in a continuous process because, due to the strength of the structure, successive pieces can be glued together end to end using only butted joints or, if desirable, finger joints.
The structure is symmetrical and rigid. It does not bend like beams made of solid wood. Also, the structure requires less and lower-quality wood material than corresponding solid-wood timber with the same strength properties.
Further advantages over thicker timber are that the pieces will dry faster and require less drying energy, and that they can be better and more quickly impregnated, if necessary.
The wooden structure of the invention can be used, e.g., in the skeletal structures of buildings, in various load-bearing structures, door frames, fence poles, table legs, etc. Moreover, the cavity inside the structure can be used as a duct for the mounting of electrical and other conductors and piping.
When elongated bodies of a rectangular cross-sectional form are manufactured by joining several pieces together by pressing and glueing, problems are frequently caused by the uneven and obliquely directed pressure loads resulting from the relative positions of the pressing rollers, with the consequence that the obliquely directed forces applied to the pieces may damage the tongues and grooves or equivalent provided on the pieces.
On the other hand, if the pressing rollers are exactly aligned, problems are encountered in the adjustment of the rollers, because the same press must be able to press different-sized pieces of a rectangular or square cross-section.
To eliminate the problems mentioned above, there is provided according to a further aspect of the invention, a roller press specially adapted for the manufacture of elongated wooden structures according to said one aspect of the invention and comprising at least one four-roller unit for pressing said elongated body of a rectangular cross-sectional form from all four sides, in which unit the shafts of the first and third rollers are parallelly positioned relative to each other and the rollers are on opposite sides of the body to be pressed, applying a pressure on its surfaces, and the shafts of the second and fourth rollers are parallelly positioned relative to each other, and the rollers are placed on opposite sides of the body to be pressed, applying a pressure on its surfaces, the axes of rotation of all four rollers being located in one plane perpendicular to the longitudinal direction of the body to be pressed, the first roller being fixedly mounted with bearings on the frame of the press and the second and third rollers being arranged to be immovable relative to each other in the direction of the axis of the first roller but movable together in this same direction, while the third and fourth rollers are arranged to be immovable relative to each other in the direction of the axis of the second roller but movable together in this same direction.
Thus, the basic idea of the roller press of the invention is that, while one roller is fixedly mounted, the other three rollers can be moved in pairs relative to the fixed roller in such manner that the second and third rollers form a pair that moves only in the direction of the shaft of the first roller, whereas the third and fourth rollers form a pair that moves only in a direction perpendicular to the shaft of the first roller, the shafts of all four rollers being located in the same plane perpendicular to the longitudinal direction of the body to be pressed. Moreover, the rollers are placed at some distance from each other so that they can move without touching each other during adjustment of the opening size of the press.
The roller press preferably comprises several four-roller units rigidly connected to each other in such manner that the above-mentioned adjustments regarding rollers pressing against the same surface of the body take place simultaneously.
The other embodiments and features of the construction of the roller press of the invention are as stated in the claims and in the explanation of the appended drawings.
Compared to previously knoo:n presses, the roller press of the invention has the advantage that the 5 pressure is applied to the body to be pressed in exactly one plane perpendicular to id's longitudinal direction, so that the pieces to be joined are not subjected to any forces that may damage or twist their jointing:
parts. An additional advantage is the ease and vaxa.ety l0 of adjustments provided in spite of the roller lay-out described above.
In the following, the invention is 'described by way of example without restricting 'it in any way, reference being made to the drak~ing attached, wherein:
Fig. 1 presents a diagran of an embodiment of the roller press of the invention in section.
Fig. 2 presents the press components moving along with rollers 2 and 3.
Fig. 3 presents the press components-moving along with rollers 3 and 4.
Fig. 4 presents a part of a roller: press consisting of several units.
Fic~. 5 shows the cross section of an embodiment of the wooden structure of the invention.
Fig. 6 shows the cross section of another embodiment of the wooden structure of the invention:
The roller press shown in-Fig. 1 comprises four cylindrical rollers 1, 2, 3, 9, which are'sa arranged that the shafts 5 and 7 of rollers 1 and 3 are parallel to each other while the shafts 6 and 8 of rollers 2 and 4 are parallel to each other and perpendicular to shafts 5 and 7, leaving a rectangular opening in the middle of the rollers:
The shaft 5 of the Pirst roller 1 is fixedly mounted with bearings on the press frame 9. Attached to the frame is also a power means 16 for rotating the roller i. Thus; he roller cannot move axially relative V1'O 9/01092 PCT/F189/00140 a~~~~'~i~~
to the frame 9, but only rotate while remaining in place. The roller press is provided with an auxiliary frame 10 which is mounted with slide rails 11 on the press frame 9 and is movable in a direction perpendicular to the longitudinal direction of the object to be pressed, i.e, in the direction of the shafts 6 and 8. The shaft 8 of the fourth roller 4 is fixedly mounted with bearings on the auxiliary frame, ~ohich is also provided with a power means 17 for rotating the roller 4.
The auxiliary frame 10 is provided with a vertical support 18 which lies parallel to shafts 5 and 7 and carries an additional frame 12 movable along the vertical support and supporting the third roller 3, which is rigidly attached to a rota~.able shaft 7 mounted on the additional frame 12~.~At the upper end of the vertical support 18 is a sliding holder 13 which surrounds a sleeve l4 mounted on the shaft 6 of the second roller 2, parallel to shafts 6 and 8. The roller 2 is attached to shaft 6, which is rotatatable inside the sleeve 14 supporting it. The shaft end pointing away from the roller 2 is guided by a guide. track l5 attached to the frame 9, in such manner that the shaft -6 is allowed to slide in a direction perpendicular to itself, i.e, in the direction of shafts 5 and 7, but not in the direction of shafts 6 and 8.
R''ith the rollers arranged and connected in this way, rollers 2 and 3 can be moved as a rigid unit, shown in Fig. 2, in the direction of shafts 5 and 7 as indicated by the arrowwl9. In this case, rollers 1 and 4 remain in place and the height of ~the,opening of the press, i.g. the distance between rollers 2 and 4, is changed while the wridth, i.e. the distance between rollers 1 and 3, remains unchanged.
Fig. 3 represents the auxiliary frame 10, the roller 4 fixedly mounted on it; and the roller 3 supported on it by means of the additional frame 12.
W'O 90/01092 PCT/F189/OOlgO
when the the auxiliary frame 10 is moved in the direction of the arro~; 20, the auxiliary frame will move along the slide tracks 11 while the sliding holder 13 slides along the sleeve 14 so that roller 2 and its shaft 6 remain in place while only rollers 3 and 4 move in the direction of shafts 6 and 8, whereby the width of the press opening, i.e. the distance between rollers 1 and 3 is changed while the height, i.e. the distance between rollers 2 and 4, remains constant.
The rollers 1, 2, 3, 4 are located at a suitable distance, e.g, a few millimetres, from each other so that they can move past each other in the above-described manner without touching each other.
Fig. 4 shows part of an embodiment of the invention, in which the roller press consists of a number of successive four-roller pressing units foraning a long pressing tunnel where the object to be produced is pressed and subjected to a suitable treatment to enable the glue in the seams to harden before the product is delivered fron the press. Such treatment may consist e.g. of suitable heating and air-blowing operations. As shown in Fig. 4, each roller 'in at least the foremost four-roller units is provided- with a scraper 21 which shaves off any glue-that may remain on the roller surface after the pressing operation, thus preventing other parts of t.hs object surface from getting soiled.
In a roller press consisting of a number of successive four-roller units as shown in Fig. 4, the press frame 9 comprises elongated- beams 23 extending from end to end of the press. Moreover, the auxiliary frame 10 also comprises two elongated beams 24 and a5 connecting the auxiliary frames 10 of adjacent four-roller units, forming a rigid assembly enabling the auxiliary frames 10 to hove simultaneously relative to the frame 9. Similarly, the additional frame l2 also comprises an elongated bean 26 connecting the additional «'O 90/01092 PCT/F189/00140 frames 12 of different units to form a rigid assembly enabling the two-roller assemblies, illustrated by Fig.
2, in successive pressing units to be moved simultaneously in the direction of the arrow 19.
As illustrated by Fig 5, the wooden structure of the invention consists of four elongated pieces 31 identical in cross section. Each piece is of an essentially rectangular crossasectional form and has a width equalling about four times its thickness. one 36 of the narrower sides of each piece is provided with two tongues 33 of a shape tapering from a wider base toward a narrower tip, said tongue s extending over the whole length of the piece. The broader side 37 of each piece 31 is provided with jointing grooves 32 of a shape corresponding to the tongues 33, said grooves being located near the other narrowar side 38. Thus, the four pieces can be joined together longitudinally at an angle of 90' relative to each other to form a tubular structure of a square cross section. The joining is preferably ,effected using glue; and the parts are pressed together using the roller press of the invention. The result is a wooden structure that is lighter, stronger, rigider and straighter than a solid-wood body of corresponding external dimensions.
It is to be noted that, although the e:~bodiment described uses two tongues' and two grooves for each joint, their number (one or more) can be varied depending on the need in each case.
Fig. 6 shows another embodiment of the wooden structure of the invention, having a rectangular cross-sectional form. In this structure, the opposite side pieces 34 and the opposite upper and lower pieces 35, respectively, are identical. The side pieces are wide and thin ~~fhile the upper and lower pieces are narrower arid thicker. When the pfeces are thus'joined together with suitable tongues and grooves as shown in the figure, the result is an elongated bea::, structure WO 90101092 PCT/Fl$9/00140 which is considerably lighter than solid-wood beams of corresponding size and yet superior in strength and load-bearing capacity.
In the embodiments shown in Figs. 5 and 6, the wooden structure has a hollow space 39 inside it, which can be used e.g. to accommodate various conductors.
The embodiments described use grooves and tongues of a cross-sectional form essentially resembling a truncated cone. However, the joints can also be l0 implemented using other known types of round- haped or angular finger joints, tongue-and-groove joints or equivalent.
Using the roller press of the invention, a finished wooden structure as provided by,the invention can be produced by applying a pressure in a single direction perpendicular to the longitudinal direction of the structure in such manner that the jointing grooves and tongues are not subjected to any oblique forces that may damage them, ensuring that the joints will be strong and the resulting wooden structure a durable and lightstructural element suited'for use for various purposes.
The rollers 1, 2, 3, 4 are located at a suitable distance, e.g, a few millimetres, from each other so that they can move past each other in the above-described manner without touching each other.
Fig. 4 shows part of an embodiment of the invention, in which the roller press consists of a number of successive four-roller pressing units foraning a long pressing tunnel where the object to be produced is pressed and subjected to a suitable treatment to enable the glue in the seams to harden before the product is delivered fron the press. Such treatment may consist e.g. of suitable heating and air-blowing operations. As shown in Fig. 4, each roller 'in at least the foremost four-roller units is provided- with a scraper 21 which shaves off any glue-that may remain on the roller surface after the pressing operation, thus preventing other parts of t.hs object surface from getting soiled.
In a roller press consisting of a number of successive four-roller units as shown in Fig. 4, the press frame 9 comprises elongated- beams 23 extending from end to end of the press. Moreover, the auxiliary frame 10 also comprises two elongated beams 24 and a5 connecting the auxiliary frames 10 of adjacent four-roller units, forming a rigid assembly enabling the auxiliary frames 10 to hove simultaneously relative to the frame 9. Similarly, the additional frame l2 also comprises an elongated bean 26 connecting the additional «'O 90/01092 PCT/F189/00140 frames 12 of different units to form a rigid assembly enabling the two-roller assemblies, illustrated by Fig.
2, in successive pressing units to be moved simultaneously in the direction of the arrow 19.
As illustrated by Fig 5, the wooden structure of the invention consists of four elongated pieces 31 identical in cross section. Each piece is of an essentially rectangular crossasectional form and has a width equalling about four times its thickness. one 36 of the narrower sides of each piece is provided with two tongues 33 of a shape tapering from a wider base toward a narrower tip, said tongue s extending over the whole length of the piece. The broader side 37 of each piece 31 is provided with jointing grooves 32 of a shape corresponding to the tongues 33, said grooves being located near the other narrowar side 38. Thus, the four pieces can be joined together longitudinally at an angle of 90' relative to each other to form a tubular structure of a square cross section. The joining is preferably ,effected using glue; and the parts are pressed together using the roller press of the invention. The result is a wooden structure that is lighter, stronger, rigider and straighter than a solid-wood body of corresponding external dimensions.
It is to be noted that, although the e:~bodiment described uses two tongues' and two grooves for each joint, their number (one or more) can be varied depending on the need in each case.
Fig. 6 shows another embodiment of the wooden structure of the invention, having a rectangular cross-sectional form. In this structure, the opposite side pieces 34 and the opposite upper and lower pieces 35, respectively, are identical. The side pieces are wide and thin ~~fhile the upper and lower pieces are narrower arid thicker. When the pfeces are thus'joined together with suitable tongues and grooves as shown in the figure, the result is an elongated bea::, structure WO 90101092 PCT/Fl$9/00140 which is considerably lighter than solid-wood beams of corresponding size and yet superior in strength and load-bearing capacity.
In the embodiments shown in Figs. 5 and 6, the wooden structure has a hollow space 39 inside it, which can be used e.g. to accommodate various conductors.
The embodiments described use grooves and tongues of a cross-sectional form essentially resembling a truncated cone. However, the joints can also be l0 implemented using other known types of round- haped or angular finger joints, tongue-and-groove joints or equivalent.
Using the roller press of the invention, a finished wooden structure as provided by,the invention can be produced by applying a pressure in a single direction perpendicular to the longitudinal direction of the structure in such manner that the jointing grooves and tongues are not subjected to any oblique forces that may damage them, ensuring that the joints will be strong and the resulting wooden structure a durable and lightstructural element suited'for use for various purposes.
Claims (14)
1. An elongated wooden structure consisting of four pieces each of a substantially constant, rectangular cross-section, which are joined together and extend from one end of the structure to the other, each piece being provided with at least one jointing groove extending along a broad side thereof from end to end, proximate to a first narrow side of the piece while a second narrow side thereof is provided with at least one tongue arranged to engage complementarily with a corresponding groove in the adjacent, perpendicularly arranged piece, so that the four pieces are joined together to form a hollow, tubular structure.
2. A wooden structure as claimed in claim 1, wherein all the pieces are identical in cross section.
3. A wooden structure as claimed in claim 1, wherein it is a tubular structure of a square cross section.
4. A wooden structure as claimed in claim 1, wherein it is a structure of a rectangular cross section in which each pair of opposing pieces have the same cross section which is different to that of the other pair of opposing pieces.
5. A roller press specially adapted for the manufacture of elongated wooden structures as claimed in claim 1 and comprising at least one four-roller unit for pressing said elongated body of a rectangular cross-sectional form from all four sides, in which unit - the shafts of the first and third rollers are parallelly positioned relative to each other and the rollers are on opposite sides of the body to be pressed, applying a pressure on its surfaces, and - the shafts of the second and fourth rollers are parallelly positioned relative to each other, and the rollers are placed on opposite sides of the body to be pressed, applying a pressure on its surfaces, - the axes of rotation of all four rollers being located in one plane perpendicular to the longitudinal direction of the body to be pressed, - the first roller being fixedly mounted with bearings on the frame of the press, - the second and third rollers being arranged to be immovable relative to each other in the direction of the axis of the first roller but movable together in this same direction, while - the third and fourth rollers are arranged to be immovable relative to each other in the direction of the axis of the second roller but movable together in this same direction.
6. A roller press as claimed in claim 5, wherein said roller press is provided with an auxiliary frame which is mounted with slide rails on the press frame and is movable in the direction of the shafts of the second and fourth rollers, the fourth roller being fixedly mounted with bearings on said auxiliary frame.
7. A roller press as claimed in claim 6, wherein said roller press comprises an additional frame which is supported by the auxiliary frame and movable in the direction of the shafts of the first and third rollers, the third roller being fixedly mounted with bearings on the additional frame.
8. A roller press as claimed in claim 6 or claim 7, wherein the auxiliary frame is provided with a sliding holder supporting the shaft of the second roller.
9. A roller press as claimed in any one of claims 5 to 8, inclusive, wherein the end of shaft of the second roller pointing away from the second roller is supported by a guide track attached to the frame, in such manner that the shaft of the second roller is allowed to slide in the direction of the shaft of the first roller but not in the direction of the shaft of the second roller.
10. A roller press as claimed in claim 8 or claim 9, wherein the shaft of the second roller is inside a sleeve which carries the sliding holder slidably mounted on said sleeve.
11. A roller press as claimed in any one of claims 5 to 10, inclusive, wherein a power means is mounted on the frame and serves to rotate the first roller.
12. A roller press as claimed in any one of claims 6 to 11, inclusive, wherein the auxiliary frame is provided with a power means for rotating the fourth roller.
13. A roller press as claimed in any one of claims 5 to 12, inclusive, wherein the press comprises several four-roller units forming an elongated pressing tunnel, mutually corresponding rollers of different units being rigidly connected to each other to allow simultaneous adjustment.
14. A roller press as claimed in claim 13, wherein the press comprises a heating and drying means to allow the hardening of the glue in the joints of the object being pressed in said elongated pressing tunnel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2034024 CA2034024C (en) | 1991-01-11 | 1991-01-11 | Wooden structure, and a roller press for producing the structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2034024 CA2034024C (en) | 1991-01-11 | 1991-01-11 | Wooden structure, and a roller press for producing the structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2034024A1 CA2034024A1 (en) | 1992-07-12 |
| CA2034024C true CA2034024C (en) | 2001-07-24 |
Family
ID=4146816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2034024 Expired - Fee Related CA2034024C (en) | 1991-01-11 | 1991-01-11 | Wooden structure, and a roller press for producing the structure |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2034024C (en) |
-
1991
- 1991-01-11 CA CA 2034024 patent/CA2034024C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2034024A1 (en) | 1992-07-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0426740B1 (en) | Wooden structure, and a roller press for producing the structure | |
| AU727987C (en) | Converted wood articles, composite wood products made therefrom and method of making same | |
| JP6811192B2 (en) | Manufacturing method of laminated wood products and laminated wood products | |
| CA2034024C (en) | Wooden structure, and a roller press for producing the structure | |
| CA1169637A (en) | Apparatus for bonding wood girders | |
| US2573465A (en) | Method of producing wooden boards secured against warping | |
| EP0755330B1 (en) | A corrugated construction unit and a method for producing the same | |
| EP3620588B1 (en) | Glued timber truss | |
| US20020059775A1 (en) | Converted wood article | |
| SE542164C2 (en) | Laminated wood products and methods of their manufacture | |
| ATE66397T1 (en) | WOODWORKING MACHINE. | |
| JP3487531B2 (en) | Manufacturing method of long composite wide and wide board | |
| CN111093964B (en) | Method and apparatus for producing fiber-reinforced panel-shaped building components | |
| CH670126A5 (en) | Wooden constructional component - comprises layers of squared timber glued together | |
| RU2159700C1 (en) | Method for manufacture of wood panels by pasting and panel produced by this method | |
| WO2016024039A1 (en) | Timber truss joint | |
| JPS59140011A (en) | Manufacture of aggregate floor board utilizing small-diameter wood with heart | |
| GB2416511A (en) | Press for the manufacturing of composite wooden structures |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |