Henry F. Phillips

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Part of the series on
Screw draw types
Image:Screw a.png	Slotted
Image:Screw b.png	Phillips
Image:Screw c.png	Pozidriv
Image:Screw d.png	Torx
Image:Screw e.png	Hex
Image:Screw f.png	Robertson
Image:Screw g.png	Tri-Wing
Image:Screw h.png	Torq-Set
Image:Screw i.png	Spanner Head
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Henry F. Phillips (1890 – 1958) was a U.S. businessman from Portland, Oregon, and inventor of the Phillips-head screw and screwdriver. His inventions built on an earlier concept credited to the inventor J. P. Thompson.

[edit] General notes

Image:Phillips screw head.jpg

The importance of the crosshead screw design is its self-centering properties, useful on automated production lines which use powered screwdrivers. Phillips' major contribution was in driving the crosshead concept forwards to a point where it was adopted by screwmakers and automobile companies.

Although he received patents for the design in 1936 (US Patent #2,046,343, US Patents #2,046,837 to 2,046,840), it was so widely copied that by 1949 Phillips lost his patent.

The American Screw Company was responsible for devising a means of manufacturing the screw, and successfully patented and licensed their method; other screw makers of the 1930s dismissed the Phillips concept since it calls for a relatively complex recessed socket shape in the head of the screw — as distinct from the simple milled slot of a flathead screw.

The Phillips Screw Company and the American Screw Company went on to devise the Pozidriv screw, which differs from the Phillips in that it is designed to accommodate greater torque than the Phillips.