Recessed head fastener and driver therefor

Details Recessed head fastener and driver therefor Recessed head fastener and driver therefor

1980-01-24

1982-07-13

Jones, Jr., James L.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

B25B 1348

Patent

active

043388353

ABSTRACT:
A fastener, such as a screw or bolt, has a recessed head for receiving a driver therein. Four arcs intersect, providing a squarish opening to the recess, which has circularly concave walls descending from the arcs to the base of the recess. The driver comprises a shaft having a somewhat spherical head in profile. Four arcs intersect to form the external surfaces and a squarish cross-section for the head. The recessed arcs are not concentric with the head arcs when the fastener and driver are mated, and the arc radii of the recess exceed the corresponding arc radii of the mated head. Transmission of force between driver and fastener is efficient even when the driver is tilted relative to the fastener axis.

REFERENCES:
patent: 3213719 (1965-10-01), Kloack
patent: 3498173 (1970-03-01), Wright

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