US2491498A - Flooring consisting of laminated boards - Google Patents

Description

Dec. 20, 1949 G. KAHR 2,491,498

FLOQRING CONSISTING OF LAMINATED BOARDS Filed Oct. 5, 1944 45 5') 5 .a Gusfiaf mu B ZNVENTORJ BY $146064 Q QQAJD ATTORNEYS,

Patented Dec. 20, 1949 FLOORING CONSISTING OF LAMINATED BOARDS Gustaf Kithr, Stockholm, Sweden Application October 3, 1944, Serial No. 556,947 In Sweden September 10, 1943 Section 1, Public Law 690, August 8, 1946 Patent expires September 10, 1963 1 Claim. 1

The present invention refers to floorings consisting of laminated boards united with one another by means of tongues and. rabbets, that is to say of boards composed of a plurality of slabs glued together, if desired with intermediate plywood layers therebetween. The invention particularly refers to such iloorings which are provided with a wearing layer of parquet slabs, which are in part at least arranged in the transverse direction of the board and reach with their end portions to the edges of the board. The parquet slabs are generally arranged so as to form designs with alternately longitudinally and transversel extending slabs, adjacent boards being then displaced relatively to each other in the laying of the floor, in a manner such that transversely extending slabs of one board will be located opposite longitudinally extending slabs of the other board, and vice versa, in order to prevent end wood from abuting against end wood in the joints. This measure involves a certain limitation in the forming of the parquet design, and also involves loss of timber on account of the crosscutting of the boards necessitated thereby when the boards are fitted into the parquet design. The present invention has for its object to obviate this disadvantage, and substantially consists in the provision between boards of the above-named description of boards the wearing layers of which have a longitudinally extending fibre direction at least at the edge portions thereof. These intermediate layers may be of the same width as the remaining boards, but are preferably made narrower, so that they will substantially have the nature of joint fillets arranged between the other boards. This obviates the otherwise necessary fitting of the boards relatively to each other to avoid end Wood on both sides of the joints, besides which the parquet design may be selected with greater freedom and, perhaps, such designs may be made use of that consist wholly or for the major portion thereof of transversely extending slabs.

The invention is illustrated in the accompanying drawing which shows an example of embodiment of a flooring constructed in accordance with the invention. Figure 1 is a plan view of a piece of flooring of said description, and Figure 2 is a cross section of the same.

The flooring is composed of a number of boards I, 2 united with one another by means of tongues and rabbets. As will be seen from Figure 2, each board consists of a core layer 3 and of layers 4, arranged on both sides thereof, the upper layer 4 constituting the wearing layer and consisting of parquet slabs 6, 1, 8, whereas the lower layer 5 may consist of one or more veneer layers. To avoid warping of the board, the core layer, which may consist of a coherent board or parallel longitudinally extending slabs, is provided with longitudinal incisions or kerfs 9 cut in from the opposite sides. Arranged between adjacent boards are narrower boards 2 which, the same as the boards I, consist of three layers 3, 4, 5 glued together, which are constructed in a similar way and consist of the same material as the boards I. The wearing layer on these narrower boards consists of longitudinally extending slabs It and of ribs I l extending longitudinally on both sides thereof, said ribs forming the longitudinally extending edges of the wearing layer. The ribs II! have, like the slabs It, the fibre direction extending longitudinally of the board, the transverse slabs 6, l of the boards I abutting with their ends against the ribs ll extending at right angles thereto. In the illustrated example, the parquet design is substantially formed by transversely extending slabs 6, 1, while only a few shorter slab-s 8 are arranged beside the joints with their fibre direction extending longitudinally of the board. By this arrangement the parquet design of the boards may consequently be selected independently of the pattern of the intermediate boards 2, which latter consequently need not necessarily be accurately fitted relatively to the boards I. As shown on the extreme right hand side of the drawing, the narrower boards 2 may, if desired, be provided with a wearing layer consisting of a coherent plywood layer 12 or the like covering the whole of the board and having a longitudinally extending fibre direction.

Obviously, the boards 2 may be of any suitable width, or they may have the same width as that of the boards l. However, they are preferably made comparatively narrow, so as to obtain the character of joint fillets arranged between the other boards. In the example shown, the narrower boards are provided with rabbet tongues on both sides, while the boards 2 are provided with a rabbet on both sides, but evidently the tongue and the rabbet may be so arranged that each board has a tongue on the one side and a rabbet on the other side, or so that the intermediate boards 2 have a rabbet on both sides.

I claim:

A flooring comprising wide and narrow composite elongated wooden board units each completely fabricated prior to laying from a top surface layer and underlying layers laminally bonded, the several units being arranged with the 3 narrow units between the wide units and having squarely abutting edges provided with interfitting tongue and groove, the edges of the adjacent board units being held in position by the interfitting tongue and groove, an -underlying;lay er of each wide unitconsisting.of-elements with the lengths and grains extending longitudinally and for the full length of the wide units and the;

surface layer of each wide unit comprising amultiplicity of parquet elements extending from edge to edge of such wide unit and with their lengths and grains disposed transversely withresnect-to the longitudinal elements, the narrow units forming joint fillets between the wide units, andthe surface layer of each of said narrow units comprising parquet elements lying :between marginal,

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES: PATENTS Number Name Date 491,647 Hetzer Feb. 14, 1893 735,969 Guilhou Aug. 11, 1903 1,115,039 Unger Oct. 2'7, 1914 2,280,071 Hamilton Apr. 21, 1942 2,324,628 Kahr July 20, 1943 FOREIGN PATENTS Number Country Date 69,234 Austria June 25, 1915 284,361 Italy 1931 149,634 Switzerland Dec. 1, 1931

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