and fixed relative to the clamp the distances between the object and the clamps may be precisely controlled application_number US 8554302 A description referring to fig1 3 there is shown a clamp generally indicated at 10 clamped to an overhead beam 12 the overhead beam 12 is depicted as an u201c i u201d beam but it could be a beam or support of any shape that would accept the clamp 10 the clamp 10 has a generally u201c c u201d shaped body 14 with a threaded fastener 16 threaded through one leg of the u201c c u201d shaped body 14 a lock nut 18 is included on the threaded fastener 16 to lock the fastener in place after the clamp 10 is secured to beam 12 a vertical bore 20 fig3 is provided through the body 14 of clamp 10 the vertical bore 20 has a conical end 22 at the lower end of the clamp 10 within the vertical bore 20 is positioned a wedge retainer 24 which is generally conical in shape with an extended cylindrical end portion 24 a and which has a bore extending through the length of the wedge retainer 24 to accept a cable the wedge retainer 24 retains wedges 26 about its periphery the wedges 26 are depicted as balls but they could also be wedges of other shapes without departing from the spirit of this invention the wedge retainer 24 is urged downwardly relative to the clamp body 14 by a spiral spring 28 that is secured at the upper end of the body 14 by a spring cap 30 fixed to the body 14 a retainer lock nut 32 is threaded onto the outer extension of the wedge retainer 24 for a purpose to be described a cable.