Grating

#The present invention relates to a grating, for example for use in ventilation openings in house walls or as a foot scraper outside of doors. Gratings for these and similar objects generally are assembled of several ribs and at least two carrying bars provided with grooves for supporting the ribs. The ribs may be in parallel with each other and arranged like a louvre and close to their ends be secured in the grooves in the carrying bars, which latter are substantially perpendicular to the longitudinal direction of the ribs.

#Gratings of this kind have heretofore been manufactured in such a manner, that the ribs were inserted into the grooves in the carrying bars and welded thereon. The welding, however, was troublesome and took some time. The gratings, therefore, tended to become expensive. The material choice for the grating, besides, is limited substantially to weldable materials. When, moreover, a rib becomes curved or crooked, its exchange is tedious and difficult.

#It is, therefore, one object of the present invention to construct a grating of ribs and carrying bars which is simple and cheap to manufacture and repair. grating of ribs and carrying bars, at which separately manufactured ribs and carrying bars simply and cheaply can be assembled without welding to a stable coherent grating.

#Further characterizing features and advantages of gratings according to the invention should become apparent from the following description of preferred embodiments. It should be understood, however, that the detailed description, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the present invention will become apparent to those skilled in the art from this detailed description. Referring now to the figures there is seen:

#FIG. 1 shows a grating obliquely from the side,

#FIG. 2 shows a first embodiment of a rib seen in the longitudinal direction of the carrying bars as the rib is positioned in the grating.

#The grating shown in FIG. 1 is intended to be inserted into a ventilation opening in a house wall. It can be inserted into the opening with or without a walling-in frame. The grating is assembled of several equal ribs 1 arranged in parallel like a louvre. The ribs are secured, close to their ends in two tubular carrying bars 2, which are substantially perpendicular to the longitudinal direction of the ribs and have a rectangular section. The carrying bars are provided with grooves 3 in a spaced relationship of 30 mm for supporting the ribs 1. Said grooves may be saved or otherwise cut out and extend from one narrow side of the carrying bars inward to the centre of the broad sides of the carrying bars. The grooves lie in planes forming an angle of about 40.degree. with the longitudinal direction of the carrying bars.

#FIG. 2 shows a first embodiment of a rib seen in the longitudinal direction of the carrying frames as the rib is oriented in the grating, while FIGS. 4 and 5 show a portion of the same rib seen from somewhat different directions. The rib has a plane central portion 7 and two mutually parallel plane long sides 5 bent to an angle of 40.degree. to the central portion. The rib is provided close to its ends with recesses 4. The portions of the carrying bars which are located directly in front of the grooves 3 fit into the recesses 4. In the bottom of said recesses a tip 6 may be formed which projects into the recess and is enclosed by the carrying bar when the rib is pushed into a groove in the carrying bar. The rib, further, has a circular hole 8 close to each recess.

#FIG. 3 shows a second preferred embodiment of a rib in a grating according to FIG. 1. It differs from the first embodiment only in that it has no tips projecting from the bottom of the recesses.