Phillips Screw Company

Frederick A Simmons

A screw head is provided with projections on selected of the driver-engageable surfaces of the head to interlock with surfaces and edges of the driver to reduce the tendency for the driver to slip out of the recess during driving and also to provide a temporary stick-fit between the driver and the recess.

Recessed screw heads and drivers

A punch for forming a screw head is provided with grooves which will form projections on selected of the driver-engageable surfaces of the head. The projections are arranged to interlock with surfaces and edges of the driver to reduce the tendency for the driver to slip out of the recess during driving and also to provide a temporary stick-fit between the driver and the recess.

Tools for punching fastener heads

A screw head is provided with projections on selected of the driver-engageable surfaces of the head to interlock with surfaces and edges of the driver to reduce the tendency for the driver to slip out of engagement with the screw during driving and also to provide a temporary stick-fit between the driver and the screw.

Growing community of inventors

Framingham, MA, United States of America

Frederick A Simmons