Apparatus for forming a weakened zone in pavements

Claim 1

IN COMBINATION WITH APPARATUS FOR FORMING PAVEMENT, INCLUDING MEANS FOR COMPACTING FRESHLY POURED CEMENTITIOUS MATERIAL, THE IMPROVEMENT OF A STRIP-INSERTING DEVICE MOUNTED REARWARDLY OF SAID PAVING APPARATUS AND ADAPTED TO BE ADVANCED THEREWITH,SAID DEVICE COMPRISING MEANS INCLUDING A PAIR OF SPACED PALTES DEFINING A SLOTTED GUIDE, SAID GUIDE BEING ADAPTED TO BE POSITIONED IN THE PATHWAY OF FRESHLY POURED BUT COMPACTED AND RELATIVELY RIGID CEMENTITIOUS MATERIAL FOR TORMING A GROOVE THEREIN, SAID GUIDE BEING LONGITUDINALLY ALIGNED IN THE DIRECTION OF ADVANCEMENT AND HAVING A RELATIVELY THIN AND FORWARDLY INCLINED LEADING EDGE EXTENDING FROM THE BOTTOM OF THE GUIDE TO POINT ABOVE THE LEVEL OF FRESHLY COMPACTED CONCRETE, MEANS FOR SUPPLYING AND FEEDING A DIVIDER STRIP THROUGH SAID SLOTTED GUIDE INCLUDING A SUPPLY OF DIVIDER STRIP MATERIAL, AND A RECIPROCATING VIBRATING MEANS MOUNTED UPON SAID GUIDE FOR IMPARTING VIBRATION THERETO IN A DIRECTION SUBSTANTIALLY TRANSVERSE OF THE DIRECTION OF ADVANCEMENT