Frictional sheet assembly for grills of ventilation systems. (Machine-translation by Google Translate, not legally binding)

Frictional sheet assembly for grills of ventilation systems, characterized because such set includes: first and second thermoplastic support bars defining each a rod, whose rod defines a longitudinal axis, and that have a plurality of coplanary projects that extend essentially normal one side of such axis, having each one of those projects more or less the same length and having an external surface of generally uniform cylindrical configuration and having more or less the same diameter, and being formed such projects solidarily as part of such bars of support, such support bars being located in parallel-spaced ratio with such projects directed in oneway to the other; a plurality of leaves situated between those bars defining each one of these leaves a first and second extremes and sides upper and lower and having a size and a configuration of transversal section uniform in all its length, defining each sheet a tube generally of aerodynamic configuration, defining each pipe a first edge, a second edge and an interior space, the pipe being formed from a solidaria plate of relatively thinny material, where the sheet is curved backwards ones and a edge of the sheet is secured under of the other, being said indoor space in such first edge of transverse section usually circular on an arc of approximately 270j, having such transverse section circular a diameter of among 0.002 and 0.004l less than that of probes, being said first extreme of such sheets united in a rotary way to respective outputs, introducing one of those sticks in such internal space in the first edge of such sheet, with which it obtains a boundaries between each one of such projects and one of these respective leaves, with which such sheets can be made rotate in relation to those first and second bars against a frictional resistance, and means of reinforcement longitudinales formed along all the length of each side of each sheet, in opposition between yes. (Machine-translation by Google Translate, not legally binding)