boettner

Claim 1

A REUSABLE PANEL SYSTEM FOR FORMING CONCRETE FORM STRUCTURES COMPRISING A PLURALITY OF PANELS ARRANGED TO BE POSITIONED EDGEWISE ADJACENT ONE ANOTHER IN A COMMON PLANE AND TO FORM A CONCRETE CONTAINING SURFACE, EACH PANEL INCLUDING A SMOOTH, PLANAR CONCRETE CONTAINING SURFACE AND AN OUTSIDE SURFACE SANDWICHED OVER A STRENGTHENING CORE, AN EDGING MEMBER MOUNTED ON THE EDGES OF SAID ADJACENT PANELS, THERE BEING AT LEAST ONE RACEWAY IN EACH SAID EDGING MEMBER EXTENDING ALONG THE LENGTH OF EACH MEMBER AND ARRANGED TO BE COOPERATIVELY POSITIONED WITH AND FORM WITH A SIMILAR RACEWAY IN THE ADJACENT ABUTTING PANEL AN OUTWARDLY OPENING GROOVE THEREBETWEEN, THE RACEWAY IN EACH PANEL INCLUDING AN UNDERCUT, A PLURALITY OF KEYS ARRANGED TO SLIDABLY FIT IN SAID RACEWAYS AND HAVING A PORTION TO SECURE AGAINST THE UNDERCUTS OF THE ADJACENT PANELS FOR TEMPORARILY HOLDING ADJACENT PANELS TOGETHER, CLAMP MEANS EXTERNALLY OF AND ADJACENT SAID GROOVE CONNECTED WITH EACH SAID KEY AND BEARING AGAINST AT LEAST ONE OF SAID PANELS FOR CLAMPING SAID KEYS IN SAID KEYWAYS AND THEREBY MAINTAIN SAID PANELS TOGETHER, AND MEANS COOPERATIVE WITH MEANS EXTENDING FROM SAID KEYS IN SAID KEYWAY AND SAID CLAMP MEANS FOR SECURING THE SAME TO SHORING MEMBERS.