Apparatus for manufacturing pretensioned reinforced concrete slabs

Claim 1

IN AN APPARATUS FOR MANUFACTURING CONCRETE SLABS HAVING SPACED PRE-TENSIONED STRANDS EXTENDING THEREALONG, A MOBILE FRAME SUSPENDED FOR MOVEMENT ALONG THE GROUND IN VERTICALLY SPACED RELATION WITH RESPECT THERETO, A FIRST BIN MOUNTED ON SAID FRAME ADJACENT THE FORWARD END THEREOF, A SECOND BIN MOUNTED ON SAID FRAME AND SPACED REARWARDLY OF SAID FIRST BIN, A VIBRATING COMPACITOR EXTENDING ACROSS SAID FRAME IN THE SPACE BETWEEN SAID FIRST AND SECOND BINS AND SUSPENDED FROM SAID FRAME, SAID COMPACTOR HAVING A SERIES OF PARALLEL SPACED ELONGATED VIBRATING COMPACTING SHOES HAVING ADVANCE PLOW-LIKE ENDS FOR PLOWING THE CONCRETE OVER SAID STRANDS, MEANS FOR VIBRATING SAID SHOES FOR COMPACTING THE CONCRETE BETWEEN AND ABOUT SAID STRANDS AND FORMING CHANNELS BETWEEN SAID STRANDS, A TRANSVERSE SHAFT EXTENDING ACROSS SAID FRAME REARWARDLY OF SAID SECOND BIN AND SUSPENDED FROM SAID FRAME AND HAVING A SERIES OF HIGH FREQUENCY VIBRATING SHOES INDIVIDUALLY PIVITED THERETO, SAID SHOES HAVING RELATIVELY FLAT COMPACTING BOTTOM SURFACES FOR COMPACTING THE CONCRETE LAID BY SAID SECOND BIN, LINKS MOVABLY MOUNTED ON SAID FRAME AT THEIR UPPER ENDS AND SUSPENDING SAID SHAFT FROM SAID FRAME FOR LIMITED MOVEMENT WITH RESPECT THERETO, SPRING MEANS BIASING SAID SHAFT AND SHOES IN CONCRETE COMPACTING POSITIONS, AND INDIVIDUAL HIGH FREQUENCY VIBRATORS MOUNTED ON SAID SHOES FOR INDEPENDENT FLOATING ENGAGEMENT WITH THE GROUND.