Grating

Claim 2

A grating structure comprising two tubular carrying bars each provided with a plurality of parallel grooves, a plurality of ribs each inserted into said grooves in such a manner so as to support said bars in a substantially parallel position one to the other near the ends of said ribs and being substantially perpendicular to said ribs, each of said ribs having a hole on each end which, upon the insertion of said ribs into said grooves, is at least partially located inside the walls of each carrying bar, square rods inserted into each carrying bar through the holes in said ribs, turned about their longitudinal axis so as to abut those parts of the grating which define the portions of the holes which are located inside the walls of the carrying bars.

Claim 3

A grating according to claim 1, wherein each rib near said hole is provided with a recess defining a tip of the rib, which tip and recess have a form and location adjusted to the respective carrying bar and grooves, so that the recess near the hole partially encloses the tubular wall of the carrying bar, and the tip partially is enclosed by the tube wall of the carrying bar.

Claim 4

A grating according to claim 1, comprising two locking plates for locking the turning of the square rods about their longitudinal axis in relation to said respective carrying bar, which locking plates at least partially are inserted into said respective carrying bar and have a recess adjusted to the section and the turning angle of the respective square rod, through which recess said respective square rod passes.

Claim 5

The grating as defined in claim 1, wherein said holes are substantially circular, and said grooves lie in planes forming an acute angle with the longitudinal direction of the carrying bars, the projection of the holes in the ribs in a plane perpendicular to the longitudinal direction of the respective carrying bar being elliptical in shape, the cross section of each square rod having a diagonal greater than the small axis of said ellipse and smaller than the big axis of said ellipse.

Claim 6

The grating as defined in claim 4, wherein said grooves lie in planes forming an acute angle of about 40° with the longitudinal direction of the carrying bars.

Claim 7

A grating according to claim 1, further including locking plates for locking the turned square rods about their longitudinal axis in relation to said respective carrying bar, said locking plates being at least partially inserted into the ends of said respective carrying bars and having a recess through which said respective square rods pass.

Claim 8

An improved grating structure comprising two tubular carrying bars each provided with a plurality of parallel grooves lying in planes forming an acute angle with the longitudinal direction of the respective carrying bar, a plurality of ribs each inserted into one of said grooves of said carrying bars in such a manner so as to support said bars in a substantially parallel position one to the other near the ends of said ribs and being substantially perpendicular to said ribs, each of said ribs having two substantially circular holes, one each on either end, which, upon the insertion of said ribs into said grooves, is at least partially located inside the walls of each tubular carrying bar, the projection of the holes in the ribs in a plane perpendicular to the longitudinal direction of the respective carrying bar being elliptical in shape, each hole having a size and location which permits a rod to be inserted within the walls of each carrying bar through the holes in said ribs, turned about their longitudinal axis so as to abut those parts of the grating which define those portions of the holes which are located inside the tubular walls of the carrying bars and locked against the ribs by deformation of the walls, the square rods having a cross section with a diagonal exceeding in length the longest side of the cross section, the diagonal being smaller than the diameter of the holes such that the rods can readily be inserted from the end of the carrying bars into the holes inside the walls of the tubular carrying bars, and the diagonal further being longer than the small axis of said ellipse.

Claim 9

An improved grating structure comprising two tubular carrying bars each provided with a plurality of parallel grooves lying in planes forming an acute angle with the longitudinal direction of the respective carrying bar, a plurality of ribs each inserted into one of said grooves of said carrying bars in such a manner so as to support said bars in a substantially parallel position one to the other near the ends of said ribs and being substantially perpendicular to said ribs, each of said ribs having two substantially circular holes, one each on either end, which, upon the insertion of said ribs into said grooves, is at least partially located inside the walls of each tubular carrying bar, the projection of the holes in the ribs in a plane perpendicular to the longitudinal direction of the respective carrying bar being elliptical in shape, each hole having a size and location which permits a rod to be inserted within the walls of each carrying bar through the holes in said ribs, turned about their longitudinal axis so as to abut those parts of the grating which define those portions of the holes which are located inside the tubular walls of the carrying bars and locked against the ribs by deformation of the walls, the square rods having a cross section with a diagonal exceeding in length the longest side of the cross section, the diagonal being smaller than the diameter of the holes such that the rods can readily be inserted from the end of the carrying bars into the holes inside the walls of the tubular carrying bars, and the diagonal further being longer than the small axis of said ellipse.

Claim 10

A grating according to claim 7, in which the ribs near said holes are provided with a recess defining a tip of the respective rib, said recesses and tips having a form so adjusted to the carrying bars that upon insertion of a rib into one of said grooves in said carrying bar one of said holes at least partially is located inside of the tube wall of the carrying bar, the recess near the hole partially enclosing the tube wall of the carrying bar at the same time as the tip partially is enclosed by said tube wall.

Claim 11

A grating according to claim 8, comprising two locking plates for locking said square rods about their longitudinal axis in relation to the respective carrying bar, which locking plates are provided with recesses adjusted to the section and turning of the respective square rod and have outer dimensions adjusted to the respective carrying bar, so that the locking plates at least partially can be inserted from the end each into a carrying bar, such that the respective square rod passes through the recess only when the square rod has the proper orientation relative to the surrounding carrying bar.