Floor covering and locking systems

Abstract

Floorboards with a mechanical locking system that allows movement between the floorboards when they are joined to form a floating floor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS [0001] The present application claims priority of Swedish Patent Application No. 0400068-3, filed in Sweden on Jan. 13, 2004 and U.S. Provisional Application No. 60 / 537,891, filed in the United States on Jan. 22, 2004, the entire contents of which are hereby incorporated herein by reference.FIELD OF THE INVENTION [0002] The invention relates generally to the technical field of locking systems for floorboards. The invention concerns on the one hand a locking system for floorboards which can be joined mechanically and, on the other hand, floorboards and floor systems provided with such a locking system and a production method to produce such floorboards. [0003] The present invention is particularly suited for use in floating wooden floors and laminate floors, such as massive wooden floors, parquet floors, floors with a surface of veneer, laminate floors with a surface layer of high pressure laminate or direct laminate and the like. [0004] The fo...

AI Technical Summary

Benefits of technology

The present invention relates to a locking system for floorboards that allows for the installation of large continuous surfaces with floating floors. The floorboards can change in size and shape due to changes in humidity, and the locking system allows for a considerable movement between floorboards without large joint gaps. The locking system is designed in such a way that a floor surface can change in shape without visible joint gaps. The floorboards can be produced with high precision using an end tenor, but there is a need for better precision in some applications. The invention provides equipment and production methods to achieve this.

Problems solved by technology

The drawback is that the continuous floor surface must as a rule be limited even in the cases where the floor consists of relatively dimensionally stable floorboards, such as laminate floor with a fiberboard core or wooden floors composed of several layers with different fiber directions.

Without such a division, it is a risk that the floor when shrinking will change in shape so that it will no longer be covered by baseboards.

Also the load on the locking system will be great since great loads must be transferred when a large continuous surface is moving.

The load will be particularly great in passages between different rooms.

They collect dirt, give an unwanted appearance and are rather expensive.

Due to these limitations on maximum floor surfaces, laminate floorings have only reached a small market share in commercial applications such as hotels, airports, and large shopping areas.

Even if such an installation would be possible, the continuous floor surface must be restricted significantly.

This method of installation involving attachment to the subfloor has, however, a number of considerable drawbacks.

The main drawback is that as the floorboards shrink, a visible joint gap arises between the boards.

The joint gap can be relatively large, especially when the floorboards are made of moisture sensitive wood materials.

The installation methods are time-consuming, and in many cases the subfloor must be adjusted to allow gluing / nailing to the subfloor.

Small floorboards are however difficult to produce with the required tolerance since they have a tendency to turn in an uncontrolled manner during machining.

The main reason why small floorboards are more difficult to produce than large floorboards is that large floorboard has a much large area, which is in contact with a chain and a belt during the machining of the edges of the floorboards.

The problem is that in many applications this is not sufficient, especially when panels are small.

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