Door closer

Claim 1

IN A HINGE AND DOOR CLOSURE UNIT ARRANGED TO CLOSE HEAVY DOORS THE COMBINATION OF AN UPPER HINGE ASSEMBLY CONNECTING THE UPPER PORTION OF A DOOR TO A STATIONARY CONSTRUCTION, SAID ASSEMBLY HAVING A LOWER FIXED BLADE BOLTED TO THE STATIONARY CONSTRUCTION, AN UPPER ROTATABLE BLADE BOLTED TO THE DOOR AND A CYLINDRICAL HINGE PIN PIVOTALLY JOINING SAID BLADES, SAID PIN DRIVEN INTO POSITION FROM TOP TO BOTTOM IN A VERTICAL CYLINDRICAL OPENING FORMED IN SAID BLADES AND SAID PIN BEING OF A LENGTH LESS THAN THE HEIGHT OF SAID UPPR HINGE ASSEMBLY; A LOWER HINGE ASSEMBLY CONNECTING THE LOWER PORTION OF THE DOOR TO THE STATIONARY CONSTRUCTION, SAID ASSEMBLY HAVING A LOWER FIXED BLADE BOLTED TO THE STATIONARY CONSTRUCTION, AN UPPER ROTATABLE BLADE BOLTED TO THE DOOR AND A CYLINDRICAL HINGED PIN PIVOTALLY JOINING SAID BLADES, SAID PIN DRIVEN INTO POSITION FROM BOTTOM TO TOP IN THE VERTICAL CYLINDRICAL OPENINGS FORMED IN SAIDBLADES AND SAID PIN BEING OF A LENGTH LESS THAN THE HEIGHT OF SAID LOWER HINGE AS SEMBLY; AN UPPER SPRING CONNECTOR AND A LOWER SPRING CONNECTOR EACH COMPRISING A CYLINDRICAL LOCKING BODY AND A CONCENTRIC CYLINDRICAL SPRING HOLDING BODY BEING SHOULDER THEREBETWEEN, SAID SPRING HOLDING BODY BEING OF A DIAMETER EQUAL TO THE OUTSIDE DIAMETER OF SAID CYLINDRICAL OPENINF OF SAID BLADES, SAID DIAMETER OF THER LOCKING BODY EQUAL TO THE DIAMETER OF SAID HINGE PIN, SAID LOCKING BODY OF THE UPPER SPRING CONNECTOR INSETED INTO THE BOTTOM OF SAID CYLINDRICAL OPENING OF THE UPPER HINGE ASSEMBLY BLADES UP TO SAID SHOULDER, SAID LOCKING BODY OF THE LOWER SPRING CONNECTOR INSERTED INTO THE TOP OF SAID CYLINDRICAL OPENING OF THE LOWER HINGE ASSEMBLY BLADES UP TO SAID SHOULDER, SAID UPPER AND LOWER LOCKING BODIES CONTACTING SAID RESPECTIVE UPPER AND LOWER HINGE PINS, AND EACH OF SAID SPRING HOLDING BODIES PROVIDED WITH DEEP, VERTICAL SPRING RECEIVING SLOTS AND SPRING FASTENING MEANS; A LONG, FLAT, VERTICAL TORSION SPRING EXTENDING BETWEEN SAID UPPER AND LOWER HINGE ASSEMBLIES AND SECURED WITHIN SAID SPRING RECEIVING SLOTS; A HOLLOW, GENERALLY CYLINDRICAL SHIELD, SAID SHIELD CONTAINING SAID TORSION SPRING AND COVERING SAID UPPER AND LOWER SPRING CONNECTOS AND SAID SHIELD EXTENDING BETWEEN AND COVERING A PORTION OF SAID UPPER AND LOWER HINGE ASSEMBLIES; AND TORSION SPRING ADJUSTING MEANS PROVIDED IN SAID UPPER AND LOWER SPRING CONNECTORS SAID MEANS COVERED BY SAID SHIELD.