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(11) | EP 2 281 974 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Flooring system comprising mechanically joinable floorboards |
| (57) A floorboard and an openable locking system therefor comprise an undercut groove
on one long side of the floorboard and a projecting tongue on the opposite long side
of the floorboard. The undercut groove has a corresponding upwardly directed inner
locking surface at a distance from its tip. The tongue and the undercut groove are
formed to be brought together and pulled apart by a pivoting motion which has its
centre (C) close to the intersection between the surface planes (HP) and the common
joint plane (VP) of two adjoining floorboards. The undercut in the groove of such
a locking system is produced by means of at least two disk-shaped cutting tools whose
rotary shafts are inclined relative to each other to form first an inner part of the
undercut portion of the groove and then a locking surface positioned closer to the
opening of the groove. An installation method for a floor of such boards comprises
the steps of laying a new board adjacent to a previously laid board, moving the tongue
of the new board into the mouth of the undercut groove of the laid board, angling
the new board upward during continued insertion of the tongue into the undercut groove
and simultaneously angling down the new board to the final position. A manufacturing
method for manufacturing the undercut groove uses machining by means of at least two
different rotary cutting tools whose rotary shaft is set at different angles. A wedge-shaped
tool for laying of the floorboards is wedge-shaped with an upwardly directed engaging
surface at its thicker end.
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