Clamping apparatus and apparatus for use in erecting temporary guard rails

An apparatus for use in clamping onto an edge of a structure, said structure having opposed surfaces, said apparatus comprising:

• a stanchion;
• a first clamping assembly attached to said stanchion;
• and
• a second clamping assembly selectively, slidably moveable longitudinally along said stanchion, said second clamping assembly including a first collar slidably movable on said stanchion, said first collar including a first frame attached to said first collar, said first frame having a first rib and a second spaced rib, there being a dog attached to said second rib, said stanchion being received between said first and second ribs, said stanchion having a series of longitudinally spaced openings. the spacing between said first and second ribs being sufficient to permit rocking movement of said first frame relative to said stanchion, whereby said dog can engage a preselected one of said openings upon movement of said first collar longitudinally along said stanchion, said second clamping assembly further including for supporting a post, said support plate extending laterally outward in a direction away from said stanchion, said second clamping assembly further comprising attached to said first frame and a bearing plate spaced from and connected to said support plate, said support plate being positioned closely adjacent one of said opposed surfaces of said structure when said structure is clamped between said first and second clamping assemblies, said force imparting assembly acting on said bearing plate to compressively urge said support plate into operative, compressive engagement with said one of said opposed surfaces of said structure.