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*PHILLIP’S HEAD*
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*SYMBOL* —>
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*henry F phillips* –>
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(June 4, 1889 – April 13, 1958)
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Henry Frank Phillips was an American businessman from Portland, Oregon.
The Phillips-head (“crosshead”) screw and screwdriver are named after him.[1]
The importance of the crosshead screw design lies in its self-centering property, useful on automated production lines that use powered screwdrivers.[2]
Phillips’ major contribution was in driving the crosshead concept forward to the point where it was adopted by screwmakers and automobile companies. The credited inventor of the Phillips screw was John P. Thompson who, in 1932, patented (#1,908,080) a recessed cruciform screw and in 1933, a screwdriver for it.[3]
After failing to interest manufacturers, Thompson sold his self-centering design to Phillips in 1935.[4] Phillips formed the Phillips Screw Company in 1934. After refining the design (U.S. Patent #2,046,343, U.S. Patents #2,046,837 to 2,046,840) for the American Screw Company of Providence, Rhode Island, Phillips succeeded in bringing the design to industrial manufacturing and promoting its rapid adoption as a machine screw standard.[5] American Screw then spent $500,000 originating a method of manufacture.[6] One of the first customers was General Motors who used the innovative design in 1936 for its Cadillac assembly-lines. By 1940, 85% of U.S. screw manufacturers had a license for the design.[7]
Due to failing health, Phillips retired in 1945. He lost his patent in 1949.[8] He died in 1958.
^ US2046837A, Phillips, Henry F., “Means for uniting a screw with a driver”, issued 1936-07-07
^ Adams, Cecil (24 November 1989). “Why did this guy Phillips think we needed a new type of screw?”. The Straight Dope. Retrieved 9 May 2014.
^ “Patent Application”. Retrieved 23 November 2019.
^ “Phillips Timeline – 1935”. Phillips Screw Company. Archived from the original on 2 March 2012. Retrieved 18 November 2011.
^ “Cross Shaped Slots Help Guide Screws” Popular Science, January 1936, page 38 middle of page
^ “July 7, 1936: Get a Grip Phillips Screws Up the Toolbox”. Retrieved 2023-04-25.
^ “About Phillips – A Historic View”. Phillips Screw Company. Archived from the original on 2011-07-10. Retrieved 2010-01-11.
^ Origin and meaning of Phillips by Etymonline https://www.etymonline.com/word/Phillips
en.wikipedia.org /wiki/Henry_F._Phillips
Henry F. Phillips
Contributors to Wikimedia projects3-3 minutes 6/10/2003
From Wikipedia, the free encyclopedia
Phillips screw head
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The Phillips screw drive (specified as an ANSI Type I Cross Recess[10] and type H in ISO documentation) was created by John P. Thompson, who, after failing to interest manufacturers, sold his design to businessman Henry F. Phillips.[11][12]
Phillips is credited with forming a company (Phillips Screw Company), improving the design, and promoting the adoption of his product.[11]
The original 1932 patent[13] expired in 1966, but the Phillips Screw Company continued to develop improved designs.[11]
The American Screw Company of Providence, Rhode Island, was responsible for devising a means of efficiently manufacturing the screw, and successfully patented and licensed their method;
other screw makers of the 1930s dismissed the Phillips concept because it called for a relatively complex recessed socket shape in the head of the screw, as distinct from the simple milled slot of a slotted screw.
The Phillips screw design was developed as a direct solution to several problems with slotted screws:
high cam-out potential;
need for precise alignment to avoid slippage and damage to driver, fastener, and adjacent surfaces;
and difficulty of driving with powered tools.
Phillips drive bits are often designated by the letters “PH”,[11] plus a size code 0000, 000, 00, 0, 1, 2, 3, or 4 (in order of increasing size);
the numerical bit size codes do not necessarily correspond to nominal screw size numbers.[3][14]
The design is often criticized for its tendency to cam out at lower torque levels than other “cross head” designs.
There has long been a popular belief that this was a deliberate feature of the design, to assemble aluminium aircraft without overtightening the fasteners.
There is no good evidence for this suggestion, and the property is not mentioned in the original patents
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