Abstract: A cap (10) for accumulators suited for the automatic refill of distilled water includes a main body (20) inside which there is a chamber (13) suited for the distribution of the distilled water through a hole (14). The hole is shut by a valve (32) controlled by a float (30) and connected to the float by means of a toggle joint. The toggle joint consists of a right-angled lever (35) and of a shaft (34) connected by a hinge to the lever and to the valve. The toggle joint ensures a very high force for the shutting of the valve, such as to stand high deliveries of liquid even under pressure. The cap is also equipped with a float (30) in the shape of an upside-down glass, that is, open at the bottom on the side of the liquid upper surface, so that the push on the float is determined by the over-pressure of the air and the gasses contained in the interior of the float. The overpressure increases in direct relation to the rising of the electrolyte level.

Abstract: The lid of the invention is suited to be closed by pressure on containers for electric accumulators, without the need for welding or gluing. Said lid (4; 20) presents two perimetric edges (5, 6; 21, 22), each of which goes to contrast against the vertical walls (3, 11; 24) of the container (1; 25) by means of at least a projection (7, 9; 23) forming a continuous tightening cord. Moreover, on at least one of the two edges (5, 6; 21, 22) a cog (8, 10; 26) is foreseen, said cog being seated in an indentation of the container, thereby preventing it from coming out. The container is of the type obtained with the blow-moulding process and it presents at its upper edge a perimetric indentation (24) or impression (2) with an indentation (11) suited to block at least one cog belonging to one of the two lid edges. The lid has an external edge which does not protrude in relation to the overall surface of the container.