Hold-down anchor device for prestressed grouped cables

Claim 1

AS A NEW ARTICLE OF MANUFACTURE, IN COMBINATION, A HOLD-DOWN ANCHOR DEVICE FOR POSITIONING THE TENSIONING CABLES OF A PRESTRESSED CONCRETE GIRDER WITH A GIRDER FORM PREPARATORY TO CONCRETE POURING OPERATIONS, SAID ANCHOR DEVICE COMPRISING A UNITARY METAL CASTING OF ROUGHLY M-SHAPE CONFIGURATION AND PROVIDING AN UPPER BRIDGE PORTION FROM WHICH THERE DEPEND THREE SPACED PARALLEL LEGS INCLUDING A CENTRAL LEG AND TWO OUTSIDE LEGS, THE TWO OUTSIDE LEGS, IN COMBINATION WITH THE CENTRAL LEG, DEFINING A PAIR OF RELATIVELY DEEP DOWNWARDLY OPENING NOTCHES DESIGNED FOR RECEPTION THEREIN OF RESPECTIVE GROUPS OF TENSIONING CABLES AND FOR ASSIMILATION OF THE COMBINED UPWARD THRUST OF SUCH CABLES WHEN THE SAME ARE DRAWN TAUT, SAID BRIDGE PORTION BEING FORMED WITH AN UPWARDLY EXTENDING INTEGRAL CYLINDRICAL BOSS IN AXIAL ALIGNMENT WITH THE CENTRAL LEG SAID BOSS AND CENTRAL LEG HAVING FORMED THEREIN A VERTICAL BORE ADAPTED TO RECEIVE LOOSELY THERETHROUGH A GUIDE CABLE ON WHICH THE DEVICE AS A WHOLE IS VERTICALLY SLIDABLE, THE UPPER REGION OF SAID BORE PRESENTING A FRUSTO-CONICAL INNER WALL SURFACE OF RELATIVELY SMALL SLANT ANGLE, BORE AND HAVING COLLET SURFACES IN DISPOSED WITHIN BORE AND HAVING COLLET SURFACES IN OPERATIVE ENGAGEMENT WITH SAID FRUSTRO-CONICAL INNER WALL SURFACE OF THE BORE, SAID COLLET ASSEMBLY BEING ADAPTED TO RECEIVE SAID GUIDE CABLE THERETHROUGH.