Heavy window balance assembly

Claim 1

A HEAVY BALANCE ASSEMBLY COMPRISING: A PAIR OF SPRING OPERATED BALANCE UNITS EACH HAVING A CHANNEL UNIT WITH A SINGLE COIL SPRING POSITIONED THEREIN AND ANCHORED AT ONE EXTREMITY TO ONE END OF THE CHANNEL UNIT, A FLOATING ANCHOR CONNECTED TO THE OTHER EXTREMITY OF THE COIL SPRING AND HAVING A PLURAL GROOVE ROLLER UNIT JOURNALLED THEREIN, A FIXED ANCHOR POSITIONED AT THE OTHER EXTREMITY OF THE CHANNEL UNIT AND CONNECTED THERETO WITH A SECOND PLURAL GROOVED ROLLER UNIT JOURNALLED THEREIN AND AT LEAST ONE GROOVED NON-ROTATABLE CYLINDRICAL GUIDE POSITIONED THEREON, A BALANCE CORD CONNECTED TO THE FLOATING ANCHOR AND WOUND ALTERNATELY AROUND THE JOURNALLED ROLLER UNITS OF THE FLOATING AND FIXED ANCHORS IN THE GROOVES THEREIN WITH THE FREE EXTREMITY OF THE CORD BEING DIRECTED OVER THE NON-ROTATABLE GUIDE TO SLIDE IN THE GROOVE THEREIN AND THROUGH AN APERTURE IN THE CHANNEL UNIT OPPOSITE THE OPEN SURFACE THEREOF; CATCH MEANS SECURED TO THE FREE EXTREMITY OF THE BALANCE CORD AND ADAPTED TO BE CONNECTED TO A FOOT MEMBER SECURED TO THE BOTTOM SIDE OF THE WINDOW SASH, SAID PAIR OF BALANCE UNITS BEING ADAPTED TO BE MOUNTED ON ONE SIDE JAMB OF A WINDOW CASING IN AN END TO END RELATIONSHIP WITH THE EXTREMITIES OF THE BALANCE UNITS HAVING THE NON-ROTATABLE GUIDES WITH THE CORDS DIRECTED OVER THE SAME AND THE APERTURES IN THE CHANNEL UNIT BEING POSITIONED IN ABUTTING RELATIONSHIP.