A blender, for producing ice-cream and similar, has a box-shaped outer casing; a substantially cylindrical tubular bowl having a horizontal axis and extending from the surface of, and inwards of, the box-shaped casing; and a cover fitted movably to the box-shaped casing so as to be positioned closing the inlet of the bowl, a hopper projecting from the body of the cover, a safety grille fixed removably to the body of the cover and designed to partly occupy the inlet of the hopper. The cover has a number of parallel, aligned, projecting pins projecting from the body of the cover. The safety grille has a supporting crosspiece extending astride the projecting pins and having a number of transverse dead holes engaged firmly, but easily removably, by respective aforementioned projecting pins; and a rigid grille structure projecting from the supporting crosspiece to engage the inlet of the hopper.