Importance

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Abstract

A fastening device includes a body having an engaging surface and threads concentric with the rotational axis of the body. The engaging surface has formed therein a plurality of ratchet-like projections having a sawtooth-type circumferential cross section. Each projection includes a first radially outer edge and a second radially inner edge which together define a leading point which forms a most prominent portion of the projection. Each first edge of each projection extends along a respective first tangent line of a plurality of first tangent lines which extend from an inner periphery to an outer periphery of the engaging surface in directions tangentially inclined with respect to the radial. Each second edge of each projection extends along a respective second tangent line of a plurality of second tangent lines which extend from the inner periphery to the outer periphery of the engaging surface in directions tangentially inclined with respect to the radial and in a direction of inclination opposite to that of the first tangent lines. The first and second tangent lines are spaced at regular intervals to intersect such that there are formed a plurality of the leading points along each tangent line between the inner and outer peripheries of the engaging surface.

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First Claim