Patent ID: 9481107
Filing Date: 2016-11-01
CPC Classification: B01F,B28C

Claim Text:
1. A dual spiral mixing fin assembly adapted to mix and guide material contained in a rotatable mixing drum of a type used in a transit concrete vehicle mixing system, the assembly comprising: (a) dual spiral metal mixing fins having an upper edge and a lower edge and extending transversely along a mixing space of a mixing drum, the lower edge being attachable to an inner drum surface; (b) wherein the dual spiral mixing fins comprise a plurality of large openings spaced apart along the fins for allowing mixed concrete and ingredient materials to migrate along a drum mixing space through the openings in the fins in both a forward and rearward direction; (c) wherein the dual spiral mixing fins further comprise a plurality of small openings spaced apart along the fins and spaced from the lower edge but closer to the lower edge than the large openings that accommodate the passage of cleanout materials along a drum mixing space; and (d) a plurality of strut members attached to forward portions of the mixing fins and adapted to be fixed to the front interior surface of a mixing drum.