Clamping device for display structures

A clamping device comprising, in combination, a pair of socket-forming assemblies each mounted for independent pivotable movement relative to the other about a given pivot axis, each of said socket-forming assemblies comprising a pair of confronting members having confronting surfaces forming a socket, the longitudinal axes of the sockets of said confronting members being perpendicular to the pivot axis of each socket-forming assembly so that the angular position of said socket-forming assemblies can be adjusted to various positions between those where said socket axes are parallel and where they are generally perpendicular to one another, the socket-forming surface of one of the members of each of said pairs of confronting members providing a socket-forming surface extending over a greater arc than that of the other member and terminating at points which provide a socket entryway occupying an appreciable portion of a quadrant and which is asymmetrically related to a reference line extending transversely of its pivot axis, said pair of members of each socket-forming assembly being reversible in position in the clamping device so that the socket entryways of the two socket-forming assemblies can be asymmetrically related to said reference line on either side thereof, each of said pairs of confronting members forming a clamp and being mounted for relative movement wherein the confronting socket-forming surfaces thereof are progressively movable toward one another to clamp around an elongated member or slotted panel-receiving insert member when placed in the socket formed therebetween, and clamp-forming means for forcing each of said pair of members toward each other to tighten the same around an insert member or elongated member placed within the socket thereof.