Re-filling and fume-discharging device for electric accumulator batteries

An automatic filling device for introducing electrolyte refill liquid into an electric accumulator, said device adapted to be inserted into a hole formed in the lid of an electric accumulator having at least one first duct for fume discharge and at least one second duct for refill liquid, comprising:

• a body sealingly insertable into the hole having a cavity and top, said body having at least one first hole for fume discharge, communicating with the corresponding first duct for the discharge of the fumes and at least one second hole for refill, communicating with the corresponding second duct for the inlet of the re-fill liquid;
• a tubular element including an outer tubular section having a side wall portion sized for matching said cavity in said body having at least one through-opening for communicating with said at least one second hole;
• and a cylindrical guiding element co-axial with said outer tubular section;
• a transversal surface formed within the tubular element having a central throughhole;
• a tubular stick having an open upper end, said stick being slidingly secured in said hole and passing through said transversal surface;
• a float formed at a lower end of the stick co-operating with the liquid within the accumulator to produce an upward pushing force on the float;
• a flexible membrane having a central opening and an outer edge, being connected with said tubular stick at the upper end;
• first sealing locking means for securing the stick in the opening of the central membrane, and second sealing locking means for connecting the outer edge of the flexible membrane to the side wall of the tubular section;
• said tubular stick further including closing means located intermediate the ends thereof for engaging with said hole in said transversal surface to seal it, to selectively permit and prevent passage of re-fill liquid flowing from said at least one second hole, said flexible membrane defining on one side thereof within said tubular member an exhaust chamber communicating with said at least one first hole and with the open end of said tubular stick and, on an opposite side, a build-up chamber for allowing build-up of the refill liquid, communicating with said at least one second hole and within which pressure of said built-up refill liquid contained therein causes the deformation of said membrane, to produce on said tubular stick a force which increases the pushing force provided by said float.