EP1990162A1 - Arrangement for preventing the curving of a solid wooden slab - Google Patents

Arrangement for preventing the curving of a solid wooden slab Download PDF

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Publication number
EP1990162A1
EP1990162A1 EP08075469A EP08075469A EP1990162A1 EP 1990162 A1 EP1990162 A1 EP 1990162A1 EP 08075469 A EP08075469 A EP 08075469A EP 08075469 A EP08075469 A EP 08075469A EP 1990162 A1 EP1990162 A1 EP 1990162A1
Authority
EP
European Patent Office
Prior art keywords
slab
groove
tail part
arrangement
solid wooden
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.)
Granted
Application number
EP08075469A
Other languages
German (de)
French (fr)
Other versions
EP1990162B1 (en
Inventor
Esko Hietala
Kari Monto
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.)
Isku Teollisuus Oy
Original Assignee
Isku Teollisuus 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 Isku Teollisuus Oy filed Critical Isku Teollisuus Oy
Publication of EP1990162A1 publication Critical patent/EP1990162A1/en
Application granted granted Critical
Publication of EP1990162B1 publication Critical patent/EP1990162B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
    • A47B2220/00—General furniture construction, e.g. fittings
    • A47B2220/008—General furniture construction, e.g. fittings characterised by materials
    • A47B2220/0088—Furniture made of bamboo or rattan

Definitions

  • the object of this invention is an arrangement for preventing the curving of a solid wooden slab, such as a solid wooden tabletop.
  • a solid wooden slab which is comprised of one or more layers of wooden boards glued side by side together, or similar, is extremely stout in structure and is suitable for use for many different purposes, e.g. as tabletops or as raw material for the furniture industry.
  • One solution to prevent the curving of a solid wooden slab is to make grooves in the bottom surface of the slab.
  • a solid stiffener piece e.g. of iron, is fitted into each grove.
  • a drawback in this prior-art solution is that the ends of the groove and of the stiffener part generally extend for the entire width of the slab and thus come right up to the edges of the slab, which spoils the outer appearance of the slab and hampers its surface treatment.
  • the purpose of this invention is to eliminate the drawbacks of prior art and to achieve a significantly better arrangement than prior-art solutions for preventing the curving of a solid wooden slab, which is simple to install and enables in particular surface treatment of the slab from both above and below before installation of the stiffener structure.
  • a transverse dovetail groove of the slab is used, to which is fitted a dovetail of the shape of the groove containing a stiffener structure of multiple parts.
  • the stiffening structure itself contains
  • Each groove is thus shorter than the transverse width of the whole slab, in which case also a more beautiful end result in terms of outward appearance is achieved when the grooves do not extend right to the edge of the slab.
  • Fig. 1 presents a rectangular solid wooden tabletop 1, in the corners of both ends of which are depressions 2 with screw holes for the table legs and beside them two transverse stiffening structures 3 according to the invention, of which one is presented installed into position and the other as an explosion drawing and also magnified in Fig. 2 .
  • a transverse dovetail groove 31 that is slightly shorter than the width of the slab of the table is used, which is machined in the bottom surface of the slab according to Fig. 2 such that the groove widens as it goes into the slab from the bottom surface of the slab.
  • the groove is made e.g. by turning, such that the groove is made in the center of the slab so that it does not extend to the edges of the slab.
  • the stiffening structure according to the invention contains:
  • the material of the stiffening structure can be selected relatively freely and is not restricted to the solid wood and plywood of what is presented above.
  • the amount of wedging parts can also be that desired, such as e.g. Fig. 4 , in which there is only one, part 36.
  • the amount of stiffening structures can be selected according to the length and width of the slab such that the slab remains rigid and does not curve.

Abstract

Arrangement for preventing the curving of a solid wooden slab, such as a solid wooden tabletop (1), in which arrangement one or more transverse grooves are arranged in the bottom surface of the slab into which a stiffening structure is fitted, wherein
the groove is a dovetail groove (31), and the stiffening structure (3) is of multiple parts and contains
- a wedge-shaped tail part (31), smaller than the groove and corresponding to the groove, which has inclined side walls and a bottom surface and a top surface,
- one or more strip-shaped wedging parts (33, 34, 36) for fitting to the sides of the tail part,
- a counterpart (35), the same length as the tail part, for fitting to the exterior of the slab, and
- tightening parts (37) provided with threads, with which the tail part can be fixed to the counterpart, in a manner allowing tightening, by means of the wedging parts.

Description

    Field of the invention
  • The object of this invention is an arrangement for preventing the curving of a solid wooden slab, such as a solid wooden tabletop.
    • Prior art
  • A solid wooden slab, which is comprised of one or more layers of wooden boards glued side by side together, or similar, is extremely stout in structure and is suitable for use for many different purposes, e.g. as tabletops or as raw material for the furniture industry.
  • A problem in the use of these types of solid wooden slabs is curving of the slab owing to drying of the slab and other reasons. As a consequence of the curving the wooden slab in many cases can no longer used.
  • One solution to prevent the curving of a solid wooden slab is to make grooves in the bottom surface of the slab. A solid stiffener piece, e.g. of iron, is fitted into each grove.
  • A drawback in this prior-art solution is that the ends of the groove and of the stiffener part generally extend for the entire width of the slab and thus come right up to the edges of the slab, which spoils the outer appearance of the slab and hampers its surface treatment.
    • Object of the invention
  • The purpose of this invention is to eliminate the drawbacks of prior art and to achieve a significantly better arrangement than prior-art solutions for preventing the curving of a solid wooden slab, which is simple to install and enables in particular surface treatment of the slab from both above and below before installation of the stiffener structure.
  • In the solution according to the invention a transverse dovetail groove of the slab is used, to which is fitted a dovetail of the shape of the groove containing a stiffener structure of multiple parts.
  • The stiffening structure itself contains
    • a tail part, smaller than the groove and wedge-shaped corresponding to the groove, which has inclined side walls and a bottom surface and a top surface, and which thus can be threaded into the groove,
    • one or more strip-shaped wedging parts for fitting to the sides of the tail part,
    • a counterpart, the same length as the tail part, for fitting to the exterior of the slab, and
    • tightening parts provided with threads, with which the tail part can be fixed to the counterpart, in a manner allowing tightening, by means of the wedging parts.
  • With the solution according to the invention a significantly better structure that prevents curving of the slab than prior-art solutions is achieved. In addition the surfacing of the slab can be performed before installation of the stiffening structure, because the groove can be made in the centre of the slab without it coming out at the edges.
  • Each groove is thus shorter than the transverse width of the whole slab, in which case also a more beautiful end result in terms of outward appearance is achieved when the grooves do not extend right to the edge of the slab.
    • Short description of the drawings
  • In the following, the invention will be described in more detail by the aid of some embodiments with reference to the attached drawings, wherein
    • Fig. 1 presents a bottom view of a tabletop, in which is a stiffening structure according to the invention,
    • Fig. 2 presents a stiffening structure according to the invention as a magnified explosion drawing of point A,
    • Fig. 3 presents a cross-section of the stiffening structure of Figs. 1 and 2,
    • Fig. 4 presents a cross-section of one alternative stiffening structure.
    Detailed description of preferred embodiments of the invention
  • Fig. 1 presents a rectangular solid wooden tabletop 1, in the corners of both ends of which are depressions 2 with screw holes for the table legs and beside them two transverse stiffening structures 3 according to the invention, of which one is presented installed into position and the other as an explosion drawing and also magnified in Fig. 2.
  • In the solution according to the invention a transverse dovetail groove 31 that is slightly shorter than the width of the slab of the table is used, which is machined in the bottom surface of the slab according to Fig. 2 such that the groove widens as it goes into the slab from the bottom surface of the slab. The groove is made e.g. by turning, such that the groove is made in the center of the slab so that it does not extend to the edges of the slab.
  • The stiffening structure according to the invention contains:
    • a wedge-shaped solid wooden tail part (tightening piece) 32, smaller than the groove and corresponding to the groove, which has inclined side walls and a bottom surface and a top surface that are even, and which thus can be threaded into the groove,
    • strip-shaped plywood wedging parts (filler parts) 33, 34 are fitted to both sides of the dovetail part,
    • a solid wooden counterpart (support piece/stiffening piece) 35, the same length as the tail part, for fitting to the exterior of the slab, and
    • tightening screws 37, e.g. six units, which are screwed into the holes 38, 39 in the counterpart 35 and in the tail part 32, with which the tail part can be fixed to the counterpart, in a manner allowing tightening, by means of the wedging parts.
  • It is obvious to the person skilled in the art that the different embodiments of the invention are not limited solely to the embodiment described above, but that they may be varied within the scope of the claims presented below. The material of the stiffening structure can be selected relatively freely and is not restricted to the solid wood and plywood of what is presented above. The amount of wedging parts can also be that desired, such as e.g. Fig. 4, in which there is only one, part 36. In addition, the amount of stiffening structures can be selected according to the length and width of the slab such that the slab remains rigid and does not curve.

Claims (3)

  1. Arrangement for preventing the curving of a solid wooden slab, such as a solid wooden tabletop (1), in which arrangement one or more transverse grooves are arranged in the bottom surface of the slab into which a stiffening structure is fitted,
    characterized in that
    the groove is a dovetail groove (31), and
    the stiffening structure (3) is of multiple parts and contains
    - a wedge-shaped tail part (31), smaller than the groove and corresponding to the groove, which has inclined side walls and a bottom surface and a top surface,
    - one or more strip-shaped wedging parts (33, 34, 36) for fitting to the sides of the tail part,
    - a counterpart (35), the same length as the tail part, for fitting to the exterior of the slab, and
    - tightening parts (37) provided with threads, with which the tail part can be fixed to the counterpart, in a manner allowing tightening, by means of the wedging parts.
  2. Arrangement according to claim 1, characterized in that the groove is shorter than the transverse width of the slab.
  3. Arrangement according to claim 1 or 2, characterized in that the groove is fitted in the center of the slab such that both of its ends are situated at a distance from the edge of the slab.
EP08075469A 2007-05-10 2008-05-05 Arrangement for preventing the curving of a solid wooden slab Not-in-force EP1990162B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FI20070199U FI7970U1 (en) 2007-05-10 2007-05-10 Device for preventing curvature of a solid wooden board

Publications (2)

Publication Number Publication Date
EP1990162A1 true EP1990162A1 (en) 2008-11-12
EP1990162B1 EP1990162B1 (en) 2010-07-14

Family

ID=38069587

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08075469A Not-in-force EP1990162B1 (en) 2007-05-10 2008-05-05 Arrangement for preventing the curving of a solid wooden slab

Country Status (4)

Country Link
EP (1) EP1990162B1 (en)
AT (1) ATE473847T1 (en)
DE (1) DE602008001747D1 (en)
FI (1) FI7970U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019136992A (en) * 2018-02-14 2019-08-22 創造技術株式会社 Warpage prevention structure for preventing warpage of plate consisting of wood or woody member and warpage prevention method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE504323C (en) * 1930-08-02 Ind F P Hamberger G M B H Wooden board with reinforcing strips inserted across the grain
FR1104507A (en) * 1954-05-12 1955-11-21 Improvements made to the assembly of prefabricated panels
GB771434A (en) * 1955-11-14 1957-04-03 Bruynzeel Schaverij N V Improvements in and relating to wooden composite panels or the like
DE20112944U1 (en) * 2001-08-03 2002-01-10 Breitenkamp Willi furniture board
JP2003191213A (en) * 2001-12-25 2003-07-08 Ueki Sangyo:Kk Wood plate body, composite building material and product having it, and method for producing wood plate body
JP2005131966A (en) * 2003-10-30 2005-05-26 Itoki Crebio Corp Timber-laminated top board

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE504323C (en) * 1930-08-02 Ind F P Hamberger G M B H Wooden board with reinforcing strips inserted across the grain
FR1104507A (en) * 1954-05-12 1955-11-21 Improvements made to the assembly of prefabricated panels
GB771434A (en) * 1955-11-14 1957-04-03 Bruynzeel Schaverij N V Improvements in and relating to wooden composite panels or the like
DE20112944U1 (en) * 2001-08-03 2002-01-10 Breitenkamp Willi furniture board
JP2003191213A (en) * 2001-12-25 2003-07-08 Ueki Sangyo:Kk Wood plate body, composite building material and product having it, and method for producing wood plate body
JP2005131966A (en) * 2003-10-30 2005-05-26 Itoki Crebio Corp Timber-laminated top board

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019136992A (en) * 2018-02-14 2019-08-22 創造技術株式会社 Warpage prevention structure for preventing warpage of plate consisting of wood or woody member and warpage prevention method

Also Published As

Publication number Publication date
ATE473847T1 (en) 2010-07-15
EP1990162B1 (en) 2010-07-14
FI7970U1 (en) 2008-08-14
FIU20070199U0 (en) 2007-05-10
DE602008001747D1 (en) 2010-08-26

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