Inside corner form and clamp

Claim 1

IN A PREFABRICATED WALL FORM, INSIDE WALL FORMING MEANS COMPRISING A FIRST UPRIGHT PANEL HAVING A WALL FORMING SURFACE ON THE INNER SIDE THEREOF, A SECOND UPRIGHT PANEL DISPOSED AT RIGHT ANGLES WITH RESPECT TO THE FIRST PANEL AND WITH AN END OF SAID SECOND PANEL ADJACENT TO BUT SPACED FROM AN END OF SAID FIRST PANEL, SAID SECOND PANEL ALSO HAVING A WALL FORMING SURFACE ON THE INNER SIDE THEREOF, A GENERALLY V-SHAPED UPRIGHT CORNER FORMING SHEET METAL MEMBER HAVING FLANGES WHICH EXTEND AT A RIGHT ANGLE TO ONE ANOTHE RAND RESPECTIVELY OVERLAP AND ENGAGE THE INNER WALL FORMING SURFACES OF SAID PANELS, AN ELONGATED, STRAIGHT, HORIZONTAL ANCHOR PIN EXTENDING DIAGONALLY ACROSS SAID CORNER AND TERMINALLY SECURED TO SAID FLANGES, AND A CORNER CLAMP FOR CLAMPING SAID FLANGES OF SAID CORNER FORMING MEMBER FIRMLY AGAINST SAID WALL FORMING SURFACES, SAID CLAMP INCLUDING AN ELONGATED GENERALLY HORIZONTAL BRACE EXTENDING DIAGONALLY ACROSS SAID CORNER IN GENERALLY PARALLEL RELATION TO SAID ANCHOR PIN, SAID BRACE ENGAGING SAID PANELS ADJACENT ITS ENDS TO APPLY A GENERALLY INWARD PRESSURE THEREAGAINST, AN ELONGATED GENERALLY HORIZONTAL JAW EXTENDING TRANSVERSELY OF SAID BRACE AND BEING LONGITUDINALLY SLIDABLE WITH RE-