EP0903207A2 - Struktur zur Vermeidung des Verziehens von Massivholzplatten - Google Patents

Struktur zur Vermeidung des Verziehens von Massivholzplatten Download PDF

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Publication number
EP0903207A2
EP0903207A2 EP98203109A EP98203109A EP0903207A2 EP 0903207 A2 EP0903207 A2 EP 0903207A2 EP 98203109 A EP98203109 A EP 98203109A EP 98203109 A EP98203109 A EP 98203109A EP 0903207 A2 EP0903207 A2 EP 0903207A2
Authority
EP
European Patent Office
Prior art keywords
sub
slots
board
slot
fitted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98203109A
Other languages
English (en)
French (fr)
Other versions
EP0903207A3 (de
Inventor
Mikko Ruhberg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Puusepanliike M Ruhberg Oy
Original Assignee
Puusepanliike M Ruhberg Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Puusepanliike M Ruhberg Oy filed Critical Puusepanliike M Ruhberg Oy
Publication of EP0903207A2 publication Critical patent/EP0903207A2/de
Publication of EP0903207A3 publication Critical patent/EP0903207A3/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • 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
    • 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
    • B27M3/18—Manufacture or reconditioning of specific semi-finished or finished articles of furniture or of doors

Definitions

  • the present invention relates to a structure for preventing warping of solid-wood board.
  • Solid-wood board consisting of one or more layers of wooden laths or equivalent glued together side by side is a very sturdy structure and is applicable for use for many different purposes, e.g. as table board or as raw material for the furniture industry.
  • a problem with the use of this type of solid-wood board is the warping of the board, which is caused by drying of the board and other reasons. Due to warping, the board becomes unfit for use in many cases.
  • One solution to prevent the warping of solid-wood board is to make slots in the lower surface of the board. In each slot, a bar-like stiffening element made e.g. of iron is fitted.
  • a drawback with this prior-art solution is that, especially due to the gradual changes occurring in the wood as a result of changes in temperature and humidity and to the fact that the stiffening bar is of a length extending across the entire board, the stiffening bar frequently comes loose from the slot, thus making the board useless. Moreover, the ends of the slot and the stiffening part extend across the whole width of the board and therefore reach the very edges of the board, which is a flaw in the appearance of the board.
  • the object of the present invention is to eliminate the drawbacks of prior art and achieve a structure for preventing the warping of solid-wood board, a structure that is considerably better than prior-art solutions.
  • each slot is divided into sub-slots, of which any two successive ones are placed at a distance from each other in the lateral direction.
  • successive slots overlap each other as specified in the claims.
  • each one of the sub-slots is considerably shorter than a slot extending across the whole board, which means that an individual sub-slot as well as the stiffening element placed in it are subject to a smaller force.
  • the solution of the invention is considerably more resistant to the forces tending to warp the board than prior-art solutions, and the board is therefore less liable to be broken.
  • the final result is a board of neater appearance because the slots closest to the board edge do not extend right to the edge.
  • Fig. 1 presents a rectangular sheet of solid-wood board 1 about 2000 mm long and 1000 mm wide, with three stiffening structures 2 in the lower surface of the board 1, designed to prevent warping of the wooden board.
  • Each stiffening structure 2 consists of three successive sub-slots 3, 5 and 7 made in the lower surface of the board 1, with a stiffening element 4, 6 and 8 fitted in each sub-slot.
  • the stiffening element is of a size approximately equal to the size of the sub-slot and it may consist of e.g. an upright flat-iron bar.
  • the sub-slots 3, 5 and 7 are of a length considerably smaller than the total width of the board 1, e.g. about one third of the width of the board 1.
  • the lengths of the sub-slots 3, 5 and 7 may be e.g. 350 mm, 300 mm and 350 mm.
  • the sub-slots are disposed in an overlapping arrangement so that the longitudinal centre axes 9 and 10 (Fig.
  • Fig. 1 further shows that, e.g. in the case of three sub-slots, the sub-slots 3, 7 located farthest apart may again be placed on the same longitudinal axis 9.
  • the sub-slots 3 and 5 lying on the same axis are preferably placed closest to the edge of the board 1 while the middlemost sub-slot 5 is placed farthest away from the edge of the board 1.
  • the depth of the sub-slots 3, 5 and 7 must equal at least half the thickness of the board 1; for instance, if the thickness of the board is 25 mm, the depth of the sub-slots may be e.g. 16 mm.
  • a sufficient stiffening effect of the stiffening structure is achieved, for example, if the width of the sub-slots is 4 mm and the stiffening element fitted inside the sub-slot has e.g. a width of 3 mm and a height of 13 mm.
  • the stiffening element is fastened to the sub-slot e.g. using hardenable sealing material, which can be smoothed on the lower surface of the board so as to form a smooth and even surface with the lower surface of the board 1.
  • the board 1 presented in Fig. 2 consists of single-layer solid-wood board in which the wooden laths 11 are glued together in one layer. It is also possible to use multiple-layer boards, as in Fig. 3, in which a corresponding stiffening structure has been made in two-layer board 1' with wooden laths 12 glued together in two layers. In this case it is possible to embed the sub-slots in the middle portion of the board 1' by machining half-slots 5', 5'', 7', 7'' in the inner surface of each one of the two board layers as illustrated by Fig. 4, in which case the stiffening structures will not be visible from either side of the board.
  • the centre axes 9', 10' of the sub-slots can be located at the middle of the board in its height direction.
  • Another possibility, as illustrated by Fig. 5, is to glue two board halves provided with a stiffening structure according to the invention together, with the stiffening structures opposite to each other, thus also producing a structure in which the sub-slots are invisible.
  • the sub-slots 15', 15'', 17', 17''' and the stiffening iron bars 16', 16'', 18', 18'' placed in them may be located oppositely as in Fig. 5 or in positions different from those of the stiffening structures in the opposite board half.
  • stiffening structures 2 naturally depends on the size of the sheet of board, and so do the number of subslots needed and their dimensions as well as the number of stiffening bars or equivalent needed and their dimensions.
  • shape of the sheet of board need not be limited to rectangular sheets only, but the same stiffening structure may also be applied to sheets of solid-wood board of a circular shape as well as other shapes.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
EP98203109A 1997-09-22 1998-09-17 Struktur zur Vermeidung des Verziehens von Massivholzplatten Withdrawn EP0903207A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI973747A FI103097B (fi) 1997-09-22 1997-09-22 Rakenne massiivipuulevyn käyristymisen estämiseksi
FI973747 1997-09-22

Publications (2)

Publication Number Publication Date
EP0903207A2 true EP0903207A2 (de) 1999-03-24
EP0903207A3 EP0903207A3 (de) 2004-10-13

Family

ID=8549569

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98203109A Withdrawn EP0903207A3 (de) 1997-09-22 1998-09-17 Struktur zur Vermeidung des Verziehens von Massivholzplatten

Country Status (2)

Country Link
EP (1) EP0903207A3 (de)
FI (1) FI103097B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10036034C2 (de) * 2000-07-24 2003-12-18 Ihd Inst Fuer Holztechnologie Drei-oder mehrlagige Verbundplatte
ITPD20120200A1 (it) * 2012-06-22 2013-12-23 Doriano Canella Pannello strutturale in legno rinforzato

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR636290A (de) * 1928-04-05
GB345356A (en) * 1929-12-05 1931-03-26 Isaac Freedland Improvements in or relating to planks or boards
GB421645A (en) * 1932-06-23 1934-12-24 Johannes Brynjulvsen Een Improvements in reinforced wooden plates and reinforcing bars for the same
US2401281A (en) * 1942-04-10 1946-05-28 Oscar H Webb Composite structure
FR1089895A (fr) * 1953-12-07 1955-03-22 Sateg Panneau de coffrage pour travaux de construction
AT114711B (de) * 1967-06-15 1929-10-25 Adalbert Magrutsch Holzplatte.
FR2337018A1 (fr) * 1976-01-02 1977-07-29 Olivier Henri Panneau prefabrique

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10036034C2 (de) * 2000-07-24 2003-12-18 Ihd Inst Fuer Holztechnologie Drei-oder mehrlagige Verbundplatte
ITPD20120200A1 (it) * 2012-06-22 2013-12-23 Doriano Canella Pannello strutturale in legno rinforzato
WO2013190498A1 (en) * 2012-06-22 2013-12-27 Canella Doriano Structural panel in reinforced wood

Also Published As

Publication number Publication date
FI973747A0 (fi) 1997-09-22
FI103097B1 (fi) 1999-04-30
EP0903207A3 (de) 2004-10-13
FI973747A7 (fi) 1999-03-23
FI103097B (fi) 1999-04-30

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