Well-known till now floor elements of the solid wood, in the form of rectangular outline parquet floor or the floor board, have on one pair of adjacent connecting sides the longitudinal dados in the form of the groove , of edges approximately parallel to the face surface, and on the second pair of adjacent connecting sides the longitudinal splines in form of feathers. of the edges also approximately parallel to the face surface, corresponding in the keying fit to the mentioned dados.

At the assumption that so prepared initial material, after the assembly of floor elements united peaceably in accordance to the rule the dado-spline in the floor surface, should assure obtaining the flat surface, being the base surface for every next floor element.

However, in consequence of the material's elasticity and its stress, which increases together with the increase of length, well-known floor elements do not make obtaining the flat surfaces possible. After arrangement of such floor elements there are the longitudinal inequalities visible on the surface of floor in the lines of their assembly, requiring the polishing before putting on the face the protective coat of paint or of varnish.

Also processing of the floor elements on four-side planer with omission of the surfacer planer, during which the curvature on length remains partly or completely done away by ciamp and feeding devices of the planer, is not efficient.

After the departure of the floor element from the woodworking machine, it returns to its original curvature.

In the construction of the floor element of the solid wood, having the form of the rectangular outline parquet floor or the floor board, having on one pair of adjacent connecting sides the longitudinal dados in form of the grooves, while on second pair of adjacent connecting sides the longitudinal splines in the form of feathers, corresponding in the keying fit to the mentioned dados, characterized in that, that has from bottom-side, made on the whole width, the transverse to length incisions in form of the grooves, which depth reaches at least to the bottom edges and at most to upper edges of the dados and of the splines, where the edges of the dados and of the splines are parallel to the face surface. Preferably these transverse incisions are placed on its length more thickly than every 40 mm.

The solution according to this invention assures the obtaining the flat, not requiring the polishing floor surface. Thanks to the mentioned transverse incisions, the floor element is very elastic and susceptible to the deflection under pressure of the clamp and feeding devices of the woodworking machine, which permits to obtain the repeatable elements of so made dados and splines on their connecting sides in relation to the base face surface, that they are parallel and equally distant to it, which after the assembly gives the plane, which does not require polishing, while the assembly is very easy.

The object of the invention has been closer presented in the detailed description below explained with drawing, in which in Fig. 1 one showed the view of the part of length of the floor element from the side of the edge with spline, in Fig. 2 the cross-section in central line of the transverse incision, marked by A-A in Fig. 1.

The floor element 1 of the solid wood, in the dependence on the dimensions, and especially the length, has a form of the rectangular outline parquet floor or floor board and has on one pair of adjacent connecting sides the longitudinal dados 2 in the form of the grooves, while on second pair of adjacent connecting sides has the longitudinal splines 3 in the form of feathers, corresponding in keying fit to the mentioned dados 2. The longitudinal edges of the dados 2 and of the splines 3 are parallel on length to the face surface of the floor element 1. From the bottom-side the floor element 1 has, made on the whole width, transverse to length incisions 4 in form of the grooves, which depth reaches at least to bottom edges of the dados 2 and of the splines 3 and at most to upper edges of the dados 2 and of the splines 3. The mentioned transverse incisions 4 are placed on length of the floor element 1 more thickly than every 40 mm.