Transit-mix concrete truck

Abstract

Abstract A TRANSIT-MIX CONCRETE TRUCK IS DISCLOSED WHICH UTILIZES A STATIONARY MIXING DRUM IN WHICH IS LOCATED A ROTATABLE CONICAL HELIX SCREW. THE SCREW IS COAXIAL WITH THE DRUM AND HAS SUBSTANTIALLY THE SAME DIAMETER AS THE INNER DIAMETER OF THE DRUM, WITH THE SCREW AND THE DRUM BOTH BEING TAPERED TO FORM TRUNCATED CONES. THE SCREW IS CONSTRUCTED IN THREE STAGES, THE FIRST STAGE HAVING A LARGE AVERAGE DIAMETER AND COARSE PITCH FOR MIXING CONCRETE. THIS LARGE DIAMETER SCREW TAPERS TOWARD THE SECOND STAGE WHICH IS OF SMALLER AVERAGE DIAMETER AND FINER PITCH TO COMPRESS CONCRETE DURING DELIVERY. THE THIRD STAGE, WHICH IS SMALLEST IN DIAMETER AND FINEST IN PITCH, SERVES AS AN EXTRUSION STAGE WHICH PROVIDES SUFFICIENT PRESSURE TO EXTRUDE CONCRETE THROUGH AN ORIFICE AND INTO A DELIVERY LINE. ROTATION OF THE SPIRAL SCREW IN ONE DIRECTION CAUSES THE CONCRETE TO MOVE TOWARD THE REAR OF THE DRUM, FORCING IT TO SPILL OVER THE INNER EDGES OF THE SCREW FOR MIXING AND AGITATING. ROTATION OF THE SCREW IN THE OPPOSITE DIRECTION CAUSES THE CONCRETE TO BE MOVED INTO THE COMPRESSION AND EXTRUSION STAGES AT THE FRONT OF THE DRUM FOR SUBSEQUENT CONVEYANCE UNDER PRESSURE TO A SUITABLE DISTRIBUTION HEAD.

Inventors

• 👤 Brahim Ijac Kader

Bibliographic Details