Support of guard rails

Claim 1

A CLAMP FOR GUARD RAILS COMPRISING, A FRAME IN SUBSTANTIALLY C-SHAPE, SAID FRAME INCLUDING SPACED HORIZONTAL LEGS CONNECTED BY A VERTICAL LEG, THE UPPERMOST OF THE HORIZONTAL LEGS CARRYING AN ATTACHED UPWARDLY-DIRECTED TUBE HAVING AN INTERNALLY-THREADED PORTION, THE TUBE BEING STATIONARILY ATTACHED TO THE FRAME AND BEING THUS NON-ROTATIVE IN RESPECT THERETO, A THREADED ROD ADJUSTABLY EXTENDING THROUGH THE UPPERMOST LEG AND PROJECTING UPWARDLY WITHIN THE TUBE AND THREADABLY ENGAGING THE INTERNALLY-THREADED PORTION OF THE TUBE, SAID ROD BEING ROTATIVELY ADJUSTABLE RELATIVELY TO THE TUBE, A CLAMPING PLATE ENGAGED BY ONE END OF THE ROD AT A POINT BETWEEN THE HORIZONTAL LEGS OF THE FRAME, SAID PLATE CLAMPING A BUILDING ELEMENT BETWEEN IT AND THE LOWERMOST HORIZONTAL LEG OF THE FRAME, THE ROD HAVING A NON-ROUND END LOCATED WITHIN THE TUBE AND LOCATED WELL BELOW THE UPPER END OF THE TUBE FOR ENGAGEMENT BY A TOOL REQUIRED TO BE EXTENDED DOWN INTO THE TUBE AND ENGAGED WITH SAID NON-ROUND END AND TURNED TO THREADABLY ADJUST THE ROD AXIALLY IN RESPECT TO THE TUBE, THE NON-ROUND ANF OF THE ROD BEING ACCESSIBLE FOR THE ROTATIVE ADJUSTMENT OF THE ROD ONLY BY A TOOL INSERTED DOWN INTO THE TUBE FROM THE UPPER END OF THE SAME.