CA2598756A1 - Grid - Google Patents

Abstract

The invention relates to a grid comprising support rods that are disposed parallel to each other, filling rods which interconnect the support rods and are arranged perpendicular thereto, and a border. The inventive grid is provided with higher support rods in some areas than in the other areas.

Description

DESCRIPTION
Grid The invention relates to a grid consisting of parallel bearing bars connected by cross bars running perpendicular to the bearing bars, and of a frame.

Grids of this kind are known, for example from the DE 201 00 630 U1, and are used as structural elements in many areas, in particular as floor, handrail, stair or facade components.

The degree to which such grids are designed as solid elements varies in accordance with the anticipated load. Generally, it is considerably more economical to support loads with bearing bars having a high height-to-thickness ratio (as a rule 20:1 or more) than with bearing bars where this ratio is lower.

According to the prior art, even the localized occurrence of higher loads necessitates the use of more solid grids suited to the higher loads in question; this is due to the fact that only grids with bearing bars and cross bars that are uniformly dimensioned in each case are available. On the other hand, using a relatively small number of heavy-duty bearing bars poses the problem of a wide-meshed grid through which smaller objects could fall.

The object of this invention is to create a grid that offers an optimal relation between its localized loadability and its cost, and which additionally permits a relatively close-meshed structure.

This object is established according to the invention in that the bearing bars are higher in some parts of the grid than in other parts.

By virtue of this arrangement, those parts of the grid subjected to a higher load are able to withstand this load because the higher bearing bars in these areas have a reinforcing effect. The loadability of the bearing bars increases as the square of their height, i.e.
doubling the height of the bearing bars increases their loadability fourfold. In the other areas, which are subjected to a

2 lower load, the material input remains unchanged; the use in these areas of bearing bars that are not as high permits the economical production of a close-meshed grid. The relation between localized loadability and the cost of the grid is thus optimized.

A preferred embodiment of the invention consists in that the grid is a press locked grid.
An embodiment of the invention is described below by reference to the drawings.

Fig. 1 shows a grid according to the invention, and Fig. 2 shows a partial view of this grid.

As shown in Fig. 1, the grid of the invention - said grid being a press locked grid - consists of bearing bars 1, cross bars 2 running perpendicular to these bearing bars 1, and a frame 3.

Fig. 2 shows that the bearing bars 1 b in the area X have a greater height h2 than the bearing bars la, the height of which is denoted by hl, in the other areas. Since the square of the height of the bearing bars 1 is used to calculate the loadability, the loadability of the grid in the area X
containing bearing bars lb, which are twice as high as the bearing bars la, is four times higher than in the other areas. In this way, a maximum localized loadability can be obtained for the grid while costs are kept to a minimum. The main purpose of the bearing bars I b, being higher, is thus to support loads, while the bearing bars 1 a, being lower, serve mainly to produce a closer mesh and keep material costs low.

It goes without saying that any other height ratios h2 : hl are also possible.

It is furthermore within the scope of this invention that just a single bearing bar 1 has a greater height h2 than the other bearing bars 1.

Claims