Plasticizer mixer and method

A road surfacing machine comprising, in combination

• a chassis frame having front and rear sets of wheels;
• a burner assembly suspended in front of said chassis frame at a predetermined distance above the road surface for heating a plurality of spaced strips along the surface transverse to the road whereby the surface is heated and softened to a predetermined depth while maintaining the heated surface layer below a predetermined temperature by moving the machine along the road surface;
• a scarifier assembly adjustably attached beneath the chassis frame behind the burner assembly for raking the heated and softened road surface to substantially the predetermined depth;
• a plurality of beams secured to the chassis frame in spaced relation and parallel to the line of travel of the frame as it is carried along the road surface;
• a plurality of disc assemblies for lifting and turning portions of the scarified road surface material, each including a yoke, a shaft journalled for rotation on the yoke, and a plurality of discs secured to the shaft, each yoke being mechanically coupled to one of said beams for angular movement with respect to the longitudinal axis of the beam thereby permitting each disc assembly to rotate about its longitudinal axis and also to move angularly with respect to the axis of the beam to which it is attached in response to variations in the elevation of the road surface engaged by the disc assembly;
• and,
• a spray nozzle suspended beneath the chassis and near each disc assembly, the nozzle being aimed to spray a liquid plasticizing agent over exposed surfaces of the scarified road surface material as it is lifted and turned by the disc assemblies, whereby the liquid plasticizing agent is coated substantially uniformly over the exposed surfaces of the scarified road surface material throughout the heated layer.