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 34 is positioned within the body 14 of clamp 10 the cable 304 may be moved upwardly in the direction shown by the arrow a in fig3 if cable 4 is attempted to be moved downwardly against the direction of arrow a the wedges 26 within the wedge retainer 24 are wedged against the cable as the wedge retainer 24 moves downwardly and the wedges 26 enter the lower conical portion 22 of vertical bore 20 it will be seen that the position of the cable 34 relative to the clamp body 14 may be adjusted by moving the cable 34 upwardly in the direction of arrow a once the cable 34 is positioned in the desired location the retainer lock nut 32 is threaded upwardly against the body 14 of clamp 10 to prevent movement of the wedge retainer 24 relative to the body 14 and thereby lock the cable 34 in place referring to fig4 and 5 there is show in a second embodiment of a clamp adapted to fix a cable to an overhead beam the clamp shown generally at 40 has a generally u201c c u201d shaped body 44 with a threaded fastener 46 threaded through one leg of the body 44 a lock nut 48 is positioned on the threaded fastener 46 to lock it in place once the threaded fastener 46 clamps the body 44 of clamp 10.