A lawnmower is described comprising a cutting deck and a safety apparatus mounted with the cutting deck, which comprises a cutting blade (1), which comprises a flat solid disc-shaped central portion (2) on a horizontal geometric plane (H) and a multiplicity of radial blades (3) on a lower horizontal geometric cutting plane (C), and a protection grid (7), which is fixedly mounted with the cutting deck and covers the entire action range of said cutting blade (1), comprising a multiplicity of connecting means (9) between a support boundary element (76) and an inner ring (8) with an obstruction-free through opening (800). (Figure 1).
