Importance

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Abstract

A hat-shaped push-on fastener for telescopic application to a male member comprises a single piece structure with an annular flange defining a washer-like base and an inverted cup with the bottom of the cup constituting the top of the hat formation. The side wall of the cup is a cylindrical sleeve perpendicular to the washer-like base and adatped to closely surround the male member to which the fastener is telescopically applied. A pair of relatively rigid and inflexible teeth have tips extending radially inward and axially upward. The teeth are located on diametrically opposite sides of the sleeve and are struck inwardly from the metal of the sleeve. The roots of the teeth are at the level of the washer-like base and the ends of the tips are spaced a relatively substantial distance from the top of the hat formation with each tooth being inclined at a slight angle to the axis of the sleeve and arranged such that the end of each tip is tilted to engage the surface of the male member to which it is telescopically applied along an imaginary helical path having the same hand and substantially the same helix angle. An elongated slot is provided for receiving a screw driver for manually rotating said fastener. The slot extends through the bottom of the cup along a diametrical line generally transverse to an imaginary line extending generally diametrically between said pair of teeth with the ends of the slot being spaced radially inwardly from the side wall of the cup.

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First Claim