Concrete pavement contraction joint

Claim 1

A CONCRETE PAVEMENT CONTRACTION JOINT COMPRISING A STRIP OF CONCRETE ROADWAY, A DIVIDING PLATE EMBDEDDED IN SAID CONCRETE ON A TRANSVERSE VERTICAL PLANE TO PROVIDE A CONTROLLED BREAK UPON CONTRACTION OF THE STRIP OF CONCRETE, SAID PLATE HAVING A WIDTH APPROXIMATELY HALF THE THICKNESS OF THE CONCRETE STRIP AND BEING DISPOSED CENTRALLY OF THE THICKNESS THEREOF, A COMPRESSIBLE FILLER STRIP OF SUBSTANTIALLY RECTANGULAR SECTION DISPOSED EDGEWISE IN THE CONCRETE STRIP ABOVE SAID PLATE AND SUBSTANTIALLY IN THE PLANE THEREOF AND EXTENDING ACROSS THE WIDTH OF THE CONCRETE STRIP, THE UPPER EDGE OF SAID FILLER STRIP BEING DISPOSED BELOW THE SURFACE OF THE CONCRETE STRIP TO PROVIDE A SEALING GROOVE AND SEALING MATERIAL DISPOSED IN SAID GROOVE.