Dish-spring lock-washers

Claim 1

A LOCK-WASHER COMPRISING A CONTINUOUS SUBSTANTIALLY CONICALLY SHAPED WALL HAVING AN UNINTERRUPTED CIRCULAR INNER EDGE DEFINING A CENTRAL HOLE AND AN UNINTERRUPTED CIRCULAR PERIPHERAL OUTER EDGE, THE OPPOSED SURFACES OF SAID WALL EACH HAVING A MULTIPLE NUMBER OF LINEAR TEETH DISTRIBUTED ABOUT THE CIRCUMFERENCE OF THE WALL AND EXTENDING IN THE DIRECTION BETWEEN SAID INNER AND OUTER EDGES, THE OUTER SURFACE OF SAID SUBSTANTIALLY CONICALLY SHAPED WALL BEING FLATTENED IN THE FORM OF A PLANAR SHOULDER IMMEDIATELY ADJACENT SAID INNER EDGE DEFINING SAID CENTRAL HOLE, SAID FLATTENED SHOULDER EXTENDING IN A PLANE SUBSTANTIALLY NORMAL TO THE AXIS OF SAID HOLE, AND TEETH ON SAID OUTER SURFACE TERMINATING AT SAID FLATTENED SHOULDER, THE INNER SURFACE OF SAID SUBSTANTIALLY CONICALLY SHAPED WALL HAVING A SECOND FLATTENED SHOULDER SUBSTANTIALLY PARALLEL TO SAID FIRST-MENTIONED FLATTENED SHOULDER IMMEDIATELY ADJACENT SAID OUTER EDGE, THE TEETH ON SAID INNER SURFACE TERMINATING ADJACENT SAID SECOND FLATTENED SHOULDER AND THE ENDS THEREOF LYING IN THE PLANE OF SAID SECOND SHOULDER.