Concrete slab key joint forming strip

Claim 1

A CONCRETE FORM OF THE TYPE USED IN FORMING A KEY CONTRACTION JOINT BETWEEN ADJACENT CONCRETE SLABS, COMPRISING IN COMBINATION: (A) A PLURALITY OF STAKES ADAPTED TO BE VERTICALLY SET IN TRANSVERSELY ALIGNED RELATIONSHIP WITH THE UPPER ENDS THEREOF DISPOSED UNIFORMLY BELOW GRADE LEVEL; AND, (B) AN ELONGATED STRIP ADAPTED TO THE SUPPORT ON SAID STAKES, SAID STRIP HAVING: (1) LONGITUDINAL UPPER AND LOWER SUBSTANTIALLY COPLANER MEMBER ADAPTED TO ABUT AGAINST SAID STAKES UPON BEING SUPPORTED THEREON; (2) A LONGITUDINAL KEY DEFORMATION MEMBER INTERPOSED BETWEEN AND CONNECTED TO THE UPPER AND LOWER COPLANAR MEMBERS; AND, (3) AN INVERTED SOCKET FORMED ON THE UPPER COPLANAR MEMBER AND ADAPTED TO BE RECEIVED OVER SAID STAKES TO SUPPORT SAID STRIP THEREON, SAID SOCKET COMPRISING: (A) A FIRST PORTION EXTENDING LONGITUDIANLLY OF AND LATERALLY FROM THE UPPER EDGE OF THE UPPER OF SAID COPLANAR MEMBERS; (B) A SECOND PORTION EXTENDING LONGITUDINALLY OF SAID SUBSTANTIALLY VERTICALLY FROM SAID FIRST PORTION TO DEFINE A THIN SECTION; AND, (C) A THIRD PORTION EXTENDING FROM AND LONGITUDINALLY OF SAID SECOND PORTION IN SPACED RELATIONSHIP TO THE UPPER EDGE THEREOF AND IN SPACED SUBSTANTIALLY OPPOSED RELATIONSHIP TO THE UPPER OF SAID COPLANAR MEMBERS.