Portable vibrating concrete screed

A portable vibrating concrete screed comprising:

• (a) an elongate open structure frame mounting three spaced apart and fixedly positioned parallel blades adapted to engage and level concrete and to support the screed as said screed is moved over the concrete and with the most forward of said blades being adapted to effect a rough smoothing puddling-like action, said elongate open structure frame being in the form of an isosceles triangle in cross section, with the forward and trailing said screed blades being positioned at the lower outer corners of said triangle, said frame including a tubing member positioned at the apex of said triangle, the middle of said three blades being positioned below said apex and substantially evenly spaced between the forward and trailing blades and including cross braces fixed to and extending between said screed blades and said tubing member;
• (b) bearings mounted on said frame between the trailing pair of said blades and spaced inwardly from each end of said frame;
• (c) a vibrating element including a shaft supported for rotation in said bearing above said trailing pair of blades and extending throughout the length of said frame and beyond said bearings spaced inwardly from each end of said frame and structural means associated with said shaft designed upon rotation of said shaft to allow said shaft to vibrate said frame;
• and
• (d) a drive source carried by said frame for rotating said shaft at a sufficient speed to cause said shaft to impart uniform vibrations throughout the length of the trailing pair of said blades, said drive source comprising a gasoline engine fixed on said frame above the trailing pair of said blades, and belt and pulley means drivingly connecting said engine to said shaft, said engine being mounted in such manner on said frame to cause said screed to creep forwardly during operation thereof.