Source: http://www.google.com/patents/US6769218?dq=5,884,272
Timestamp: 2014-07-10 00:20:03
Document Index: 607879321

Matched Legal Cases: ['Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 09', 'Application No. 09', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 10', 'Application No. 09', 'Application No. 10']

Patent US6769218 - Floorboard and locking system therefor - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA 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...http://www.google.com/patents/US6769218?utm_source=gb-gplus-sharePatent US6769218 - Floorboard and locking system thereforAdvanced Patent SearchPublication numberUS6769218 B2Publication typeGrantApplication numberUS 10/043,424Publication dateAug 3, 2004Filing dateJan 14, 2002Priority dateJan 12, 2001Fee statusPaidAlso published asUS20020112433Publication number043424, 10043424, US 6769218 B2, US 6769218B2, US-B2-6769218, US6769218 B2, US6769218B2InventorsDarko PervanOriginal AssigneeValinge Aluminium AbExport CitationBiBTeX, EndNote, RefManPatent Citations (102), Non-Patent Citations (58), Referenced by (47), Classifications (9), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetFloorboard and locking system thereforUS 6769218 B2Abstract 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 connected by adjoining boards being brought together and snapped together.
TECHNICAL FIELD The invention is particularly suited for floorboards which are based on wood material and in the normal case have a core of wood and which are intended to be mechanically joined. The following description of prior-art technique and the objects and features of the invention will therefore be directed at this field of application and, above all, rectangular parquet floors which are joined on long side as well as short side. The invention is particularly suited for floating floors, i.e. floors that can move in relation to the base. However, it should be emphasized that the invention can be used on all types of existing hard floors, such as homogeneous wooden floors, wooden floors with a lamellar core or plywood core, floors with a surface of veneer and a core of wood fiber, thin laminate floors, floors with a plastic core and the like. The invention can, of course, also be used in other types of floorboards which can be machined with cutting tools, such as subfloors of plywood or particle board. Even if it is not preferred, the floorboards can after installation be fixed to the base.
DESCRIPTION OF PRIOR ART To facilitate the understanding and description of the present invention as well as the knowledge of the problems behind the invention, here follows a description of both the basic construction and the function of floorboards according to WO 9426999 and WO 9966151, with reference to FIGS. 1-10 in the accompanying drawings. In applicable parts, the following description of the prior-art technique also applies to the embodiments of the present invention as described below.
SUMMARY OF THE INVENTION 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 by snap action. Preferred embodiments are also dismountable by an angling motion which has its center close to the intersection between the surface planes and the common joint plane of two adjoining floorboards. The undercut in the tongue groove of such a locking system can be produced by means of 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.
Upward Angling about Joint Edge In general, it should be possible to angle the long side of a floorboard upwards so that the floorboards can be released. Since the boards in the starting position are joined with tight joint edges, this upward angling must thus also be able to take place with upper joint edges in contact with each other and with rotation at the joint edge. This possibility of upward angling is very important not only when changing floorboards or moving a floor. Many floorboards are trial-laid or laid incorrectly adjacent to doors, in corners etc. during installation. It is a serious drawback if the floorboard cannot be easily released without the joint system being damaged. Nor is it always the case that a board that can be angled inwards can also be angled up again. In connection with the downward angling, a slight downwards bending of the strip usually takes place, so that the locking element is bent backwards and downwards and opens. If the joint system is not formed with suitable angles and radii, the board can after laying be locked in such manner that taking-up is not possible. The short side can, after the joint of the long side has been opened by upward angling, usually be pulled out along the joint edge, but it is advantageous if also the short side can be opened by upward angling. This is particularly advantageous when the boards are long, for instance 2.4 m, which makes pulling out of short sides difficult. The upward angling should take place with great safety without the boards getting stuck and pinching each other so as to cause a risk of the locking system being damaged.
Measuring A good function, production tolerance and quality require that the joint profile can be continuously measured and checked. The critical parts in a mechanical joint system should be designed in such manner that production and measurement are facilitated. It should be possible to produce them with tolerances of a few hundredths of a millimeter, and it should therefore be possible to measure them with great accuracy, for instance in a so-called profile projector. If the joint system is produced with linear cutting machining, the joint system will, except for certain production tolerances, have the same profile over the entire edge portion. Therefore the joint system can be measured with great accuracy by cutting out some samples by sawing from the floorboards and measuring them in the profile projector or a measuring microscope. Rational production, however, requires that the joint system can also be measured quickly and easily without destructive methods, for instance using gages. This is facilitated if the critical parts in the locking system are as few as possible.
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1a-c show in three steps a downward angling method for mechanical joining of long sides of floorboards according to WO 9426999.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS A first preferred embodiment of a floorboard 1, 1′, which is provided with a mechanical locking system according to the invention, will now be described with reference to FIGS. 11a and 11 b. To facilitate the understanding, the joint system is shown schematically. It should be emphasized that a better function can be achieved with other preferred embodiments that will be described below.
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