Apparatus for making structural concrete slabs

Claim 1

APPARATUS FOR MAKING STRUCTURAL CONCRETE SLABS OF SUBSTANTIALLY H-SHAPE IN CROSS SECTION, COMPRISING AN ELONGATED BASE BLOCK, A PAIR OF SUBSTANTIALLY PARALLEL CHANNELS UPON AND EXTENDING LENGTHWISE OF SAID BLOCK, AN UPWARDLY OPENING ELONGATED PAN EXTENDING LENGTHWISE OF AND MOUNTED UPON SAID CHANNELS, UPRIGHT ARMS PIVOTED ADJACENT THEIR LOWER ENDS TO OPPOSITE SIDES OF SAID BASE BLOCK AND MOVABLE FROM AN UPRIGHT POSITION EXTENDING ABOVE THE LATTER TO AN OUTER INCLINED POSITION, TRANSVERSELY SPACED OPPOSITELY OPENING ELONGATED CHANNEL SHAPED FORMS TO EXTEND LENGTHWISE OF AN ENGAGE THE UPPER EDGES OF OPPOSITE SIDE WALLS OF SAID PAN WHEN SAID ARMS ARE IN AN UPRIGHT POSITION, AND MEANS FOR DETACHABLY HOLDING SAID ARMS IN AN UPRIGHT POSITION INCLUDING MEMBERS CARRIED BY SAID CHANNELS AND EXTENDING THROUGH SAID ARMS, AND REMOVABLE MEANS UPON THE OUTER SIDES OF SAID ARMS DETACHABLY ENGAGING SAID MEMBERS.