Device for suspending forms from structural beams

Claim 1

A GRADE BOARD SUSPENSION DEVICE FOR ADJUSTABLY MOUNTING FROM GRADE BOARDS RELATIVE TO AN ADJACENT PARALLEL JOIST, SAID DEVICE COMPRISING A FLAT RELATIVELY SHORT HORIZONTAL PLATE POSITIONABLE TRANSVERSELY ACROSS SAID JOIST, A PAIR OF DEPENDING PANELS SECURED TO OPPOSITE EDGES OF SAID PLATE SO AS TO FORM A DOWNWARDLY OPENING SLOT FOR THE RECEPTION OF THE JOIST, A PAIR OF HORIZONTAL PANELS, ONE HORIZONTAL PANEL RIGID WITH AND EXTENDING OUTWARDLY FROM EACH DEPENDING PANEL IN A PLANE BELOW THE HORIZONTAL PLATE FOR POSITIONING BELOW A GRADE BOARD, A PAIR OF VERTICAL FLANGES, ONE FLANGE RIGID WITH AND EXTENDING UPWARDLY FROM EACH HORIZONTAL PANEL AT A POINT SPACED OUTWARDLY FROM THE CORRESPONDING DEPENDING PANEL SO AS TO FORM AN UPWARDLY OPENING SLOT THEREBETWEEN FOR THE RECEPTION OF A GRADE BOARD, A LEVELLING BOLT EXTENDING VERTICALLY AND CENTRALLY DOWNWARD THROUGH THE HORIZONTAL PLATE AND INTO THE DOWNWARDLY OPENING SLOT THE LOWER END OF SAID BOLT TERMINATING IN A BEARING HEAD ENGAGEABLE IN ABUTTING RELATIONSHIP AGAINST SAID JOIST, AND THREAD MENS INTEGRAL WITH SAID PLATE FOR THREADINGLY RECEIVING SAID BOLT, SAID THREAD MEANS ENABLING A SELECTIVE EXTENSION AND RETRACTION OF THE BOLT WITHIN THE DOWNWARD OPENING, SO AS TO VARY THE HEIGHT OF THE HORIZONTAL PLATE ABOVE SAID JOIST, AND THEREBY THE HEIGHT OF THE BOARD CARRYING UPWARDLY OPENING SLOTS, SAID LEVELLING BOLT BEARING HEAD BEING INTEGRAL THEREWITH AND LATERALLY ENLARGED RELATIVE TO SAID BOLT, SAID BEARING HEAD INCLUDING A DOWNWARDLY DIRECTED FLAT FACE PROVIDING A STABLE SUPPORT SURFACE.