Cylindrical lead acid cell

Claim 1

A LEAD-ACID CELL COMPRISING A CELL RECEPTACLE HAVING A CYLINDRICAL SHAPE AND A COVER LID FOR THE SAID RECEPTACLE HAVING AT LEAST THREE OPENINGS THEREIN, A PLURALITY OF POSITIVE GRIDS HAVING ESSENTIALLY IDENTICAL CONICAL SHAPES AND EACH HAVING A GRID STRUCTURE WHICH INCLUDES A PERIPHERAL RETAINING RING FOR RETAINING THE GRID STRUCTURE AGAINST RADIAL DISTENSION, THE SAID RING COINCIDEING WITH THE PERIPHERY OF THE BASE OF THE CONE, AND EACH GRID HAVING A CENTRAL, ESSSENTIALLY CIRCULAR OPENING AT THE APEX OF THE CONE WHICH DEFINESS AN INTERNAL CONCENTRIC RUNG, SAID POSITIVE GRIDS STACKED IN VERTICAL ALIGNMENT SO THAT EACH IS SUPPORTED BY, AND JOINED SO S TO MAKE ELECTRICAL CONTACT WITH, THE ADJACENT UNDERLYING GRID AT THE AFORESAID PERIPHERAL RING, A PLURALITY OF NEGATIVE GRIDS HAVING ESSENTIALLY IDENTIAL CONICAL SHAPES WITH THE SAME APROXIMATE ANGLE OF INCLINATION AS THOSE OF THE POSITIVE GRID, SAID HUB LOCATED AT THE APEX OF EACH NEGATIVE GRID, SAID NEGATIVE GRIDS STACKED IN VERTICAL ALIGNEMENT SO THAT EACH IS SUPPORTED BY, AND JOINED SO AS TO MAKE ELECTRICAL CONTACT WITH, THE HUB OF THE UNDERLYING GRID, THE AFORESAID STACK FORMED WITH THE PERIPHERAL PORTION OF EACH NEGATIVE GRID ALTERNATING IN AN INTERLEAVING ARRANGEMENT WITH THE INTERNAL CONCENTRIC RING PORTION OF EACH POSITIVE GRID SO THAT THE INTERNAL CONCENTRIC RING SURROUNDS, AND IS CONCENTRICALLY SPACED FROM, THE HUB OF THE NEGATIVE GRID, INSULATING MEANS FOR MAINTAINING EACH POSITIVE GRID ELECTRICALLY ISOLATED FROM EACH NEGATIVE GRID, A POSITIVE POST ELECTRICALLY CONNECTED TO THE ASSEMBLY OF POSITIVE GRIDS AND EXTENDING THROUGH THE COVER LID OF THE RECEPTACLE, A NEGATIVE POST ELECTRICALLY CONNECTED TO THE ASSEMBLY OF NEGATIVE GRIDS AND EXTENDING THROUGH THE COVER LID OF THE RECEPTACLE AND A VENT EXTENDING THROUGH THE COVER LID OF THE RECEPTACLE FOR VENTING ASES FROM THE INTERIOR OF THE CELL TO THE ATMOSPHERE.