An adjustable anchor comprising a vertical cylinder including a helical spring supported on a puck depending from a vertical rod terminating in an eye projecting above the cylinder. Three anchors 120.degree. apart are pivotally supported by the puck so that upward pull on the eye by a rope will effect progressive retraction of the three anchors into corresponding openings in the cylinder against the resistance of the helical spring. An internally threaded cap of the cylinder screws onto external threads of the cylinder to adjust the tension of the spring.
