Grating stair tread, has support bars with recesses arranged on plate that is notched from side plates and is angularly engaged with side plates at distance, where slit size of each support bar and plate size form press fit

摘要

The tread has side blades (10) that are vertical and parallel to each other. Support bars extend between the side blades and are aligned at a distance and parallel to each other. Ends of the support bars are provided with slit shaped recesses11). The support bars with the recesses are arranged on a plate (12) that is notched from the side plates and is angularly engaged with the side plates at a distance. The slit size of each support bar and the size of the plate (12) form a press fit. The recesses and the plate (12) are enclosed at an angle with an upper edge of the tread.