Robertson screwdriver

Robertson screwdriver

__NOTOC__A Robertson screwdriver (also called a square drive screwdriver) is a type of screwdriver with a square-shaped tip with a slight taper (in the same way that flatheads, Phillips, hex, and Torx have flat, ×-shaped, hexagonal, and hexagrammal tips, respectively). Robertson screws are used mainly in Canada, though they can be found elsewhere.

Canadian P.L. Robertson invented the Robertson screw and screwdriver in 1908. He received a patent in 1909, and later applied for and received other patents. The last patent expired in 1964.

Robertson screwdrivers are easy to use one-handed (i.e., without using the second hand to hold the screw), in fact, when vertically driving a screw one handed, the user can let go of the driver, and the driver will stay put in the screw. They also allow for the use of angled screw drivers and trim head screws. This greatly enhances productivity.

Robertson had licensed the screw in England, but the party with which he was dealing intentionally drove the company into bankruptcy and purchased the rights from the trustee, thus circumventing Robertson.Fact|date=February 2007 He spent a small fortune buying back the rights. After that, he refused to ever allow anyone to make the screws under license. When Henry Ford tried out the Robertson screws he found they saved considerable time in the production of cars but when Robertson refused to license the screws to Ford, he realized that the use of the screws would not be guaranteed and stopped using them. [Cite web| url=http://www.mysteriesofcanada.com/Ontario/robertson_screws.htm| title=Robertson Screws] [Cite web| url=http://inventors.about.com/od/sstartinventions/a/screwdriver.htm| title=History of Screws and Screwdrivers] [Cite web| url=http://books.google.com/books?id=sCZuETU7u5oC&pg=PA58&lpg=PA58&dq=ford+robertson+screw&source=web&ots=G6rG-rlis3&sig=nDpc5ijkfNi8lvSPcaMXsLo8hb0#PPA58,M1| title=Caledonia: Along the Grand River]

Recess dimensions

Robertson-head screwdrivers are available in range of tip-sizes. A given driver's suitability for use with a particular size of screw and recess size is indicated upon its handle according to the following colour code:

Footnotes

References

* cite book
last = Rybczynski
first = Witold
year = 2000
title =
location = Toronto, ON, Canada
publisher = Harper Flamingo
isbn = 0-002-00031-8

External links

* [http://www.robertsonscrew.com/ Robertson Inc.] official web site
* [http://www.cbc.ca/inventions/inventions.html?inventionID=39 Robertson screw on Canadian Broadcasting Corporation's 50 Greatest Canadian Inventions list]
* [http://www.mcfeelys.com/ McFeely's Square Drive Screws]


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