Abstract: A spring activated cam anchor has a frame with a forward end and a rearward end and a pair of spaced apart legs that extend from the forward end and each of the legs has a substantially planar upper and lower surface. A shaft is disposed between the legs and a first and second cam are rotatably mounted to the shaft and adapted for rotating in a common direction between an insert position and a withdrawal position. Each of the cams has an engagement portion extending outwardly beyond the upper surface when in the insert position and disposed between the surfaces when in the withdrawal position. A lever actuated assembly is connected to each of the cams for rotating the cams between the insert position and the withdrawal position. The cams further include a lost motion system permitting the cams to independently rotate between the insert position and the withdrawal position when the chockstone is inserted into a fissure in a rock face.