EP0279278A2 - Frame for a supported flooring panel of sectional false floors, especially for corners - Google Patents

Frame for a supported flooring panel of sectional false floors, especially for corners Download PDF

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Publication number
EP0279278A2
EP0279278A2 EP88101530A EP88101530A EP0279278A2 EP 0279278 A2 EP0279278 A2 EP 0279278A2 EP 88101530 A EP88101530 A EP 88101530A EP 88101530 A EP88101530 A EP 88101530A EP 0279278 A2 EP0279278 A2 EP 0279278A2
Authority
EP
European Patent Office
Prior art keywords
sheet
frame
edge
plate
bent
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
EP88101530A
Other languages
German (de)
French (fr)
Other versions
EP0279278B1 (en
EP0279278A3 (en
Inventor
Thomas Rothfuss
Friedrich Georg Stummer
Walter Wengert
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.)
Mahle GmbH
Original Assignee
Mahle GmbH
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 Mahle GmbH filed Critical Mahle GmbH
Priority to AT88101530T priority Critical patent/ATE62309T1/en
Publication of EP0279278A2 publication Critical patent/EP0279278A2/en
Publication of EP0279278A3 publication Critical patent/EP0279278A3/en
Application granted granted Critical
Publication of EP0279278B1 publication Critical patent/EP0279278B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00—Flooring
    • E04F15/02—Flooring or floor layers composed of a number of similar elements
    • E04F15/024—Sectional false floors, e.g. computer floors
    • E04F15/02405—Floor panels

Definitions

  • the invention relates to a frame for double floor panels in particular.
  • the sheet metal part bent outwards on the leg with its free side edge can form the side closure of the base plate in such a way that the panels laid to form a closed base each lie directly against this side edge.
  • the only thing that is decisive is that a gap of the order of magnitude is avoided, as is given in the prior art with the upper outer edge of the plate being produced only by bending.
  • the upper bending edge region is subsequently formed at right angles on the preformed sheet metal profiles provided with beads, by pressing sheet material in a targeted manner into the bending edge area by leveling the beads. How this shaping of the bending edge area can take place in detail can be found in the following description of an exemplary embodiment.
  • a frame By welding together four frame sheet metal profiles 1 in the form according to FIG. 1, a frame can be filled with a mass for a base plate.
  • the leg 2 coming to lie on the tread surface side of the base plate consists of a first part 3 which is bent from the part 4 of the sheet metal profile 1 forming the side edge of the base plate and a second part 5 which is bent outwards onto part 3.
  • the free side edge 6 forms the side end of the subsequent base plate. This closure formed by the free side edge 6 can match the outermost region of part 4 of the sheet metal profile 1.
  • the free side edge 6 can also protrude or protrude slightly, ie about 1/10 mm from the outermost area of the part 6.
  • the lower leg 13 of the sheet metal profile 1 can also be bent back outward on itself. However, it is not necessary for the bent part to protrude all the way out.
  • Fig. 2 the starting sheet profile for the method according to claim 2 is shown.
  • the sheet profile 7 there has a U-shaped basic shape.
  • a longitudinal bead 9 is formed in the sheet metal profile near the bending edge 8.
  • the sheet profile 7 is clamped in a forming tool.
  • This tool consists in detail of a receptacle 10, a hold-down plate 11 and a pressure plate 12.
  • the tool is operated as follows:
  • the sheet profile 7 is inserted with its inner contour into the receptacle 10 and clamped with the hold-down plate 11. With the pressure plate 12, the sikke 9 is deformed flat so that the bulge of the bead 9 flows in the direction of the right-angled bending edge 8.
  • the finished sheet profile with an actually rectangular or rectangular bending edge 8, in which the bead 9 is leveled, is shown in FIG. 4.

Abstract

In frames consisting of sheet-metal sections (1) which have a bending edge at the edge with the tread plane because one leg (2) of the frame is bent round into the tread plane, this edge cannot be made sharp. Thus, when the panels are laid against one another, there is a small gap which, especially where thin hard floor coverings are concerned, can lead to a break of the floor covering at this point under a load exerted at a particular point. The sharp edge can be obtained, on the one hand, by designing the leg (2) as a sheet-metal part (5) bent back on itself, the free end of the sheet-metal part (5) coming to rest on the panel edge. Alternatively, it can be achieved in that a bead (9) formed in the sheet-metal section (7) in the vicinity of the respective panel edge is evened off in a tool in such a way that it forms as a result of the creep of the sheet-metal material. In the finished floor panel, the frame is filled with flowable hardening material. <IMAGE>

Description

Die Erfindung betrifft einen Rahmen für insbesondere Doppelbodenplatten.The invention relates to a frame for double floor panels in particular.

Bei derartigen Bodenplatten besteht ein Problem dar­in, daß die Biegekante zwischen an der Trittfläche der Platte liegendem Schenkel einerseits und die Sei­tenkante der Platten bildendem Teil des Rahmenbleches andererseits einen Radius von in der Regel mindestens etwa 1 mm aufweist. Dadurch bildet sich bei einem An­einanderlegen der Platten ein entsprechend großer Spalt, der in der Praxis unerwünscht ist. Besonders störend wirkt dieser Spalt z.B., wenn die Bodenplat­ten mit einem dünnen Hartbelag als Trittflächenbelag versehen werden. In solchen Fällen kann es nämlich passieren, daß der Hartbelag durch Belastung, z.B. durch auf diese Stelle mit Pfennigabsätzen auftreten­de Damen, einbricht. Diese Gefahr besteht vor allem in den Eckbereichen der Platten.In such floor panels there is a problem that the bending edge between the leg lying on the tread surface of the panel on the one hand and the part of the frame sheet forming the side edge of the panel on the other hand has a radius of at least about 1 mm as a rule. This creates a correspondingly large gap when the plates are placed against one another, which is undesirable in practice. This gap is particularly disruptive, for example, if the floor slabs are provided with a thin hard surface as a tread surface. In such cases, it can happen that the hard covering is subjected to stress, e.g. by women appearing with stiletto heels at this point. This danger exists especially in the corner areas of the panels.

Hier eine Verbesserung zu schaffen, ist die Aufgabe der vorliegenden Erfindung. Alternative Lösungen die­ser Aufgabe enthalten die kennzeichnenden Teile der Ansprüche 1 und 2.To create an improvement here is the object of the present invention. Alternative solutions to this problem are contained in the characterizing parts of claims 1 and 2.

Bei der Lösung nach Anspruch 1 kann der auf dem Schenkel nach außen umgebogene Blechteil mit seiner freien Seitenkante derart den Seitenabschluß der Bo­denplatte bilden, daß die zu einem geschlossenen Bo­den verlegten Platten jeweils direkt an diesem Sei­tenrand anliegen. Es ist aber auch möglich, die frei­en Seitenränder des nach außen umgeklappten Blechtei­les an den Schenkeln seitlich um ein ganz geringes Maß von z.B. etwa 1/10 mm zurückstehen zu lassen, da­mit die Platten nicht direkt an den freien Rändern der umgeklappten Blechteile, sondern an dem darunter­liegenden Rahmenprofil kontaktbildend aneinanderlie­gen. Entscheidend ist lediglich, daß ein Spalt in ei­ner Größenordnung vermieden wird, wie er im vorbe­kannten Stand der Technik bei lediglich durch Biegen erzeugter oberen Plattenaußenkante gegeben ist.In the solution according to claim 1, the sheet metal part bent outwards on the leg with its free side edge can form the side closure of the base plate in such a way that the panels laid to form a closed base each lie directly against this side edge. However, it is also possible to laterally free the free side edges of the sheet metal part folded down on the legs by a very small amount, e.g. leave about 1/10 mm behind, so that the plates do not lie directly on the free edges of the folded sheet metal parts, but on the frame profile below. The only thing that is decisive is that a gap of the order of magnitude is avoided, as is given in the prior art with the upper outer edge of the plate being produced only by bending.

Bei der Lösung nach Anspruch 2 wird an den mit Sicken versehenen vorgeformten Blechprofilen nachträglich der obere Biegekantenbereich rechtwinklig ausgeformt, indem durch Einebnen der Sicken Blechmaterial gezielt in den Biegekantenbereich gedrückt wird. Wie dieses Ausformen des Biegekantenbereiches im einzelnen kon­kret erfolgen kann, kann der nachfolgenden Beschrei­bung eines Ausführungsbeispieles entnommen werden.In the solution according to claim 2, the upper bending edge region is subsequently formed at right angles on the preformed sheet metal profiles provided with beads, by pressing sheet material in a targeted manner into the bending edge area by leveling the beads. How this shaping of the bending edge area can take place in detail can be found in the following description of an exemplary embodiment.

Je ein Ausführungsbeispiel zu jeder der beiden erfin­dungsgemäßen Lösungen ist in der Zeichnung darge­stellt. Es zeigen

  • Fig. 1 einen Schnitt durch ein Rahmenblech­ profil entsprechend der Lösung nach Anspruch 1
  • Fig. 2 den Schnitt durch ein vorgeformtes Rahmenblechprofil als Ausgangsprofil für das Umformverfahren nach Anspruch 2
  • Fig. 3 das Blechprofil nach Fig. 2 eingespannt in ein Umformwerkzeug
  • Fig. 4 einen Schnitt durch das fertig geformte Rahmenprofilblech mit rechtwinkliger Oberkante
One embodiment of each of the two solutions according to the invention is shown in the drawing. Show it
  • Fig. 1 shows a section through a frame plate Profile according to the solution according to claim 1
  • 2 shows the section through a preformed frame sheet profile as the starting profile for the forming process according to claim 2
  • Fig. 3 clamped the sheet metal profile of FIG. 2 in a forming tool
  • Fig. 4 shows a section through the finished molded frame profile sheet with a rectangular upper edge

Durch Zusammenschweißen von vier Rahmenblechprofilen 1 in der Form nach Figur 1 entsteht ein mit einer Masse aufüllbarer Rahmen für eine Bodenplatte. Der an der Trittflächenseite der Bodenplatte zu liegen kommende Schenkel 2 besteht aus einem ersten Teil 3, der aus dem die Seitenkante der Bodenplatte bildenden Teil 4 des Blechprofiles 1 abgebogen ist und einem zweiten Teil 5, der auf den Teil 3 nach außen umgebo­gen ist. Der freie Seitenrand 6 bildet den Seitenab­schluß der späteren Bodenplatte. Dabei kann dieser von dem freien Seitenrand 6 gebildete Abschluß mit dem am weitesten außen liegenden Bereich des Teiles 4 des Blechprofils 1 übereinstimmen. Der freie Seiten­rand 6 kann aber auch geringfügig, d.h. etwa 1/10 mm gegenüber dem äußersten Bereich des Teiles 6 zurück- oder vorstehen.By welding together four frame sheet metal profiles 1 in the form according to FIG. 1, a frame can be filled with a mass for a base plate. The leg 2 coming to lie on the tread surface side of the base plate consists of a first part 3 which is bent from the part 4 of the sheet metal profile 1 forming the side edge of the base plate and a second part 5 which is bent outwards onto part 3. The free side edge 6 forms the side end of the subsequent base plate. This closure formed by the free side edge 6 can match the outermost region of part 4 of the sheet metal profile 1. The free side edge 6 can also protrude or protrude slightly, ie about 1/10 mm from the outermost area of the part 6.

Auch der untere Schenkel 13 des Blechprofiles 1 kann nach außen auf sich selbst zurückgebogen sein. Dabei ist es allerdings nicht erforderlich, daß der zurück­gebogene Teil bis ganz nach außen ragt.The lower leg 13 of the sheet metal profile 1 can also be bent back outward on itself. However, it is not necessary for the bent part to protrude all the way out.

In Fig. 2 ist das Ausgangsblechprofil für das Verfah­ren nach Anspruch 2 dargestellt. Das dortige Blech­profil 7 besitzt U-förmige Grundform. Nahe der Biege­kante 8 ist eine Längssicke 9 in das Blechprofil ein­geformt.In Fig. 2, the starting sheet profile for the method according to claim 2 is shown. The sheet profile 7 there has a U-shaped basic shape. A longitudinal bead 9 is formed in the sheet metal profile near the bending edge 8.

Zur Ausbildung einer exakt rechteckigen Biegekante 8 wird das Blechprofil 7 in ein Veformwerkzeug einge­spannt. Dieses Werkzeug besteht im einzelnen aus ei­ner Aufnahme 10, einer Niederhalteplatte 11 und einer Druckplatte 12. Um die Sicke 9 einzuebnen und damit einen Materialfluß in Richtung der Biegekante 8 zu bewirken, wird das Werkzeug wie folgt betätigt:To form an exactly rectangular bending edge 8, the sheet profile 7 is clamped in a forming tool. This tool consists in detail of a receptacle 10, a hold-down plate 11 and a pressure plate 12. In order to flatten the bead 9 and thus cause a material flow in the direction of the bending edge 8, the tool is operated as follows:

Das Belchprofil 7 wird mit seiner Innenkontur in die Aufnahme 10 eingelegt und mit der Niederhalteplatte 11 festgeklemmt. Mit der Druckplatte 12 wird die Sik­ke 9 planeben so verformt, daß die Auswölbung der Sicke 9 in Richtung der rechtwinkligen Biegekante 8 fließt.The sheet profile 7 is inserted with its inner contour into the receptacle 10 and clamped with the hold-down plate 11. With the pressure plate 12, the sikke 9 is deformed flat so that the bulge of the bead 9 flows in the direction of the right-angled bending edge 8.

Das fertige Blechprofil mit einer tatsächlich recht­winkligen bzw. rechteckigen Biegekante 8, bei dem die Sicke 9 eingeebnet ist, zeigt Figur 4.The finished sheet profile with an actually rectangular or rectangular bending edge 8, in which the bead 9 is leveled, is shown in FIG. 4.

Claims (2)

1. Rahmen für eine insbesondere nur an den Ecken ge­lagerte Bodenplatte für aufgeständerte Doppelbö­den, der mit einer eingeformten Masse ausgefüllt ist und aus einem Blechprofil mit einem minde­stens an seiner Trittfläche der Platte zugekehr­ten Längsseite etwa rechtwinklig zum Rahmeninne­ren hin umgebogenen Schenkel besteht,
dadurch gekennzeichnet,
daß der Schenkel (2) aus einem auf sich selbst um 180 Grad zurückgebogenen Blechteil (5) besteht, bei dem das umgeklappte Ende in der die Trittflä­che bildenden Plattenoberfläche liegt und dort mit seinem freien Seitenrand (6) den seitlichen Plattenabschluß bildet.1.frame for a base plate for raised double floors, which is in particular only supported at the corners, which is filled with a molded-in mass and consists of a sheet metal profile with a longitudinal side facing at least on its tread surface of the plate, bent approximately at right angles to the inside of the frame,
characterized by
that the leg (2) consists of a sheet metal part (5) bent back on itself by 180 degrees, in which the folded end lies in the surface of the plate forming the step surface and forms the lateral plate end there with its free side edge (6). 2. Verfahren zur Herstellung eines Rahmens für eine insbesondere nur an den Ecken gelagerte Boden­platte für aufgeständerte Doppelböden, der mit einer einzuformenden Masse ausfüllbar ist und aus einzelnen miteinander verschweißten Blechprofilen besteht, die jeweils mindestens an der der Tritt­fläche der Platte zuzukehrenden Längsseite etwa rechtwinklig zum Rahmeninneren umgebogene Schen­kel aufweisen,
dadurch gekennzeichnet,
daß jedes Blechprofil (7) entweder in der den Seitenabschluß der Platte bildenden Fläche oder in dem umgebogenen Schenkel (2) zunächst nahe der Biegekante (8) eine in Längsrichtung verlaufende Sicke (9) aufweist, die anschließend in die je­weilige Ebene des Bleches so verformt wird, daß Material lediglich in Richtung der Biegekante (8) zur Bildung einer nach außen exakt rechtwinkligen Biegekante (8) fließen kann, wozu einerseits die nicht in Fließrichtung liegenden Teile des Blech­profiles (7) während des Verformens der Sicke (9) lagefixiert sind und daß dabei andererseits der Biegekanten (8)-Bereich in eine Form mit recht­winkliger Innenkontur zu liegen kommt.2.Procedure for the production of a frame for a base plate for raised double floors, which is in particular only supported at the corners, which can be filled with a material to be molded and which consists of individual welded sheet metal profiles, each at least on the longitudinal side facing the tread of the plate, approximately at right angles to the interior of the frame have bent legs,
characterized by
that each sheet profile (7) either in the surface forming the side of the plate or in the bent leg (2) initially near the bending edge (8) has a longitudinal bead (9) which is then deformed into the respective plane of the sheet will that material can flow only in the direction of the bending edge (8) to form an outwardly right-angled bending edge (8), for which purpose on the one hand the parts of the sheet profile (7) which are not in the flow direction are fixed in position during the deformation of the bead (9) and that, on the other hand, the bending edges (8) area come to lie in a shape with a rectangular inner contour.
EP88101530A 1987-02-19 1988-02-03 Frame for a supported flooring panel of sectional false floors, especially for corners Expired - Lifetime EP0279278B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88101530T ATE62309T1 (en) 1987-02-19 1988-02-03 FRAME FOR A FLOOR PLATE PARTICULARLY ONLY BEARED ON THE CEILING CORNERS FOR RAISED RAISED FLOORS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3705303A DE3705303C1 (en) 1987-02-19 1987-02-19 Frame for a base plate, which is only supported at the corners, for raised double floors
DE3705303 1987-02-19

Publications (3)

Publication Number Publication Date
EP0279278A2 true EP0279278A2 (en) 1988-08-24
EP0279278A3 EP0279278A3 (en) 1988-10-12
EP0279278B1 EP0279278B1 (en) 1991-04-03

Family

ID=6321335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88101530A Expired - Lifetime EP0279278B1 (en) 1987-02-19 1988-02-03 Frame for a supported flooring panel of sectional false floors, especially for corners

Country Status (6)

Country Link
EP (1) EP0279278B1 (en)
AT (1) ATE62309T1 (en)
DE (2) DE3705303C1 (en)
ES (1) ES2022475B3 (en)
NO (1) NO164313C (en)
PT (1) PT86777B (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8627631B2 (en) 2000-06-20 2014-01-14 Flooring Industries Limited, Sarl Floor covering
US8997429B2 (en) 1996-06-11 2015-04-07 Unilin Beheer B.V. Floor panels with edge connectors
US9255414B2 (en) 2000-03-31 2016-02-09 Pergo (Europe) Ab Building panels
US9464443B2 (en) 1998-10-06 2016-10-11 Pergo (Europe) Ab Flooring material comprising flooring elements which are assembled by means of separate flooring elements
US9464444B2 (en) 2010-01-15 2016-10-11 Pergo (Europe) Ab Set of panels comprising retaining profiles with a separate clip and method for inserting the clip
US9593491B2 (en) 2010-05-10 2017-03-14 Pergo (Europe) Ab Set of panels

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE608828C (en) * 1935-02-01 Gewerkschaft Kronprinz Process for the production of lightweight profiles
EP0135240A2 (en) * 1983-09-21 1985-03-27 "C.B.R. Béton" Self-supporting slab for a false floor
EP0180950A2 (en) * 1984-11-05 1986-05-14 Manfred Greschbach Panel-shaped wall element

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3146749A (en) * 1961-06-16 1964-09-01 American Can Co Method of forming a neck on a can part
DE2545854A1 (en) * 1975-10-14 1976-10-28 Lanz Ag Hermann Service-accommodating twin-plate slabbed double floor - with foamed-substance- holding intermediate layer between top smooth and bottom reinforced plate
DE2831914C2 (en) * 1978-07-20 1986-12-11 Hella 4800 Bielefeld Klöpping Concrete slab

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE608828C (en) * 1935-02-01 Gewerkschaft Kronprinz Process for the production of lightweight profiles
EP0135240A2 (en) * 1983-09-21 1985-03-27 "C.B.R. Béton" Self-supporting slab for a false floor
EP0180950A2 (en) * 1984-11-05 1986-05-14 Manfred Greschbach Panel-shaped wall element

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8997429B2 (en) 1996-06-11 2015-04-07 Unilin Beheer B.V. Floor panels with edge connectors
US9464443B2 (en) 1998-10-06 2016-10-11 Pergo (Europe) Ab Flooring material comprising flooring elements which are assembled by means of separate flooring elements
US10626619B2 (en) 2000-03-31 2020-04-21 Unilin Nordic Ab Flooring material
US10233653B2 (en) 2000-03-31 2019-03-19 Pergo (Europe) Ab Flooring material
US10156078B2 (en) 2000-03-31 2018-12-18 Pergo (Europe) Ab Building panels
US9677285B2 (en) 2000-03-31 2017-06-13 Pergo (Europe) Ab Building panels
US9611656B2 (en) 2000-03-31 2017-04-04 Pergo (Europe) Ab Building panels
US9255414B2 (en) 2000-03-31 2016-02-09 Pergo (Europe) Ab Building panels
US9260869B2 (en) 2000-03-31 2016-02-16 Pergo (Europe) Ab Building panels
US9316006B2 (en) 2000-03-31 2016-04-19 Pergo (Europe) Ab Building panels
US9534397B2 (en) 2000-03-31 2017-01-03 Pergo (Europe) Ab Flooring material
US9394699B1 (en) 2000-06-20 2016-07-19 Flooring Industries Limited, Sarl Floor covering
US10125498B2 (en) 2000-06-20 2018-11-13 Flooring Industries Limited, Sarl Floor covering
US9388586B1 (en) 2000-06-20 2016-07-12 Flooring Industries Limited, Sarl Floor covering
US8627631B2 (en) 2000-06-20 2014-01-14 Flooring Industries Limited, Sarl Floor covering
US9376823B1 (en) 2000-06-20 2016-06-28 Flooring Industries Limited, Sarl Floor covering
US8631625B2 (en) 2000-06-20 2014-01-21 Flooring Industries Limited, Sarl Floor covering
US9482013B2 (en) 2000-06-20 2016-11-01 Flooring Industries Limited, Sarl Floor covering
US9334657B2 (en) 2000-06-20 2016-05-10 Flooring Industries Limted, Sarl Floor covering
US10407920B2 (en) 2000-06-20 2019-09-10 Flooring Industries Limited, Sarl Floor covering
US9234356B2 (en) 2000-06-20 2016-01-12 Flooring Industries Limited, Sarl Floor covering
US9624676B2 (en) 2000-06-20 2017-04-18 Flooring Industries Limited, Sarl Floor covering
US9068356B2 (en) 2000-06-20 2015-06-30 Flooring Industries Limited, Sarl Floor covering
US9856657B2 (en) 2000-06-20 2018-01-02 Flooring Industries Limited, Sarl Floor covering
US9388585B1 (en) 2000-06-20 2016-07-12 Flooring Industries Limited, Sarl Floor covering
US8904729B2 (en) 2000-06-20 2014-12-09 Flooring Industries Limited, Sarl Floor covering
US8793958B2 (en) 2000-06-20 2014-08-05 Flooring Industries Limited, Sarl Floor covering
US9464444B2 (en) 2010-01-15 2016-10-11 Pergo (Europe) Ab Set of panels comprising retaining profiles with a separate clip and method for inserting the clip
US9593491B2 (en) 2010-05-10 2017-03-14 Pergo (Europe) Ab Set of panels

Also Published As

Publication number Publication date
ES2022475B3 (en) 1991-12-01
DE3862209D1 (en) 1991-05-08
EP0279278B1 (en) 1991-04-03
PT86777A (en) 1989-02-28
NO164313C (en) 1990-09-19
PT86777B (en) 1993-08-31
EP0279278A3 (en) 1988-10-12
NO880716L (en) 1988-08-22
NO164313B (en) 1990-06-11
DE3705303C1 (en) 1988-09-15
NO880716D0 (en) 1988-02-18
ATE62309T1 (en) 1991-04-15

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