Cable hold-down anchor device

Claim 1

A HOLD-DOWN ANCHOR DEVICE FOR POSITIONING THE TENSIONING CABLES OF A PRESTRESSED CONCRETE GIRDER WITHIN A GIRDER FORM PREPARATORY TO CONCRETE POURING OPERATIONS SAID HOLD-DOWN ANCHOR DEVICE COMPRISING, IN COMBINATION, A PAIR OF SPACED, GENERALLY PARALLEL, SIDE MEMBERS, EACH SIDE MEMBER INCLUDING A VERTICALLY ELONGATED FLAT PLATE OF SHEET METAL STOCK AND A PAIR OF TRANSVERSELY SPACED PARALLEL VERTICAL SUPPORTING RODS EXTENDING ALONG THE MARGINAL EDGE REGIONS OF THE PLATE AND OVERHANGING THE LOWER EDGE OF THE PLATE SO AS TO PRESENT PORTIONS WHICH DEPEND BELOW THE PLATE, SAID RODS BEING SECURED TO THE SAME SIDE OF THE PLATE BY WELDING A CLOSELY-WOUND HELICAL COIL OF ROD STOCK INTERPOSED BETWEEN THE DEPENDING PORTIONS OF THE RODS OF EACH PLATE AND SECURED BY WELDING THERETO ALONG AXIAL LINES OF TANGENCY, SAID COIL BEING FORMED WITH AN INTERNALLY THREADED BORE ADAPTED TO RECEIVE THERIN THE THREADED END OF A LAG BOLT WHEREBY THE SIDE MEMBERS MAY BE SECURED TO THE BASE SUPPORT OF THE GIRDER FORM WITHIN THE CONFINES OF THE FORM, SAID SIDE PLATES BEING FORMED WITH A SERIES OF OPPOSED PAIRS OF HOLES THEREIN WITH THE VARIOUS PAIRS BEING SPACED PROGRESSIVELY ALONG THE SIDE PLATES UPWARDLY FROM SAID COIL, A TRACTION PIN RECEIVED THROUGH EACH PAIR OF OPPOSED HOLES AND HAVING ITS OPPOSITE ENDS PROJECTING OUTWARDLY BEYOND THE REMOTE SIDES OF SAID SIDE PLATES, CABLE-ENGAGING ROLLERS IN SUBSTANTIAL VERTICAL ALIGNMENT MOUNTED ON THE PROJECTING PORTIONS OF EACH END OF THE TRACTION PINS AND ADAPTED TO OVERLIE AND TRACTIONALLY ENGAGE A PLURALITY OF THE TENSIONING CABLES SO AS TO RECEIVE THE UPWARD THRUST THEREOF AND SPACE THE SAME FROM SAID BASE SUPPORT AT THE POINTS OF CONTACT THEREWITH WHEN THE CABLES ARE DRAWN TAUT, A PLURALITY OF VERTICALLY SPACED ELONGATED STRUTS, EACH DISPOSED TRANSVERSELY OF THE ADJACENT VERTICAL SIDE EDGES OF SAID PLATES AND TERMINATING AT EACH OF ITS ENDS IN LOOPED PORTIONS IN SUBSTANTIAL VERTICAL ALIGNMENT, SAID PORTIONS LYING SUBSTANTIALLY IN A PLANE COMMON WITH THE OUTER VERTICAL FACES OF THE CABLE-ENGAGING ROLLERS, SAID STRUTS BEING SECURED TO SAID PLATES AND, IN COMBINATION WITH SAID COIL, SERVING TO MAINTAIN THE SIDE MEMBERS IN THEIR SPACED PARALLEL RELATIONSHIP, AND A KEEPER ROD EXTENDING THROUGH THE ALIGNED LOOPED PORTIONS ON EACH END OF THE STRUTS AND REMOVABLY SEATED THEREIN, SAID KEEPER RODS, IN COMBINATION WITH THE ADJACENT SIDE PLATES BEING ADAPTED TO CONFINE THEREBETWEEN THE VARIOUS CABLES SO AS TO MAINTAIN THE SAME IN VERTICAL REGISTER WITH SAID ROLLERS.