Fastener recess

Details Fastener recess Fastener recess

1977-09-16

1980-10-21

McCall, James T.

Tools

Wrench, screwdriver, or driver therefor

Having work engaging and force exerting portion inserted...

85 45, F16B 2300

Patent

active

042287235

ABSTRACT:
A recess for fasteners such as screws, bolts and the like having, in axial alignment with the shank, a central recess of a conic-frustum shape which serves as a natural center for a driver tool or for a drill bit if it becomes necessary to drill out the fastener. The wrenching elements consist of a plurality of truncated conic segments having their common center line axis coincident with the central recess. The wrenching walls for loosening lying in a plane containing the center line axis of the fastener while the walls for tightening being sloped toward the tightening direction to provide for torque limiting.

REFERENCES:
patent: 2066484 (1937-01-01), Phillips
patent: 2556155 (1951-06-01), Stellin

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