Editing Adjustable spanner (section)

==Forms and names==

There are many forms of adjustable spanners; many of them are [[screw thread|screw]]-adjusted, whereas others use [[lever]]s, and some early ones used [[wedge]]s. The early taper-locking spanners needed a hammer to set the movable jaw to the size of the nut. The modern screw-adjusted spanner and lever types are easily and quickly adjusted. Some adjustable spanners automatically adjust to the size of the nut, using a motor and battery. Simpler models use a serrated edge to lock the movable jaw to size, while more sophisticated versions are digital types that use sheets or feelers to set the size.

Geesin (2015)<ref name="Geesin-2015">{{Citation |last=Geesin |first=Ron |year=2015 |title=The Adjustable Spanner: History, Origins and Development to 1970 |publisher=Crowood Press |isbn=9781785000362 |postscript=.}}</ref> shows that wrenches with screw adjustment of various kinds were well known in the early 19th century and that one by William Barlow in 1808 was prescient.<ref name="Geesin-2015"/> By the 1830s, many designs with a central screw and a lower jaw moved by a nut were well known.<ref name="Geesin-2015"/> Geesin<ref name="Geesin-2015"/> and others<ref name="murray1845">{{cite book |first=John |last=Murray |title=The Journal of the Royal Agricultural Society of England|url=https://archive.org/details/journalroyalagr03murrgoog|year=1845|pages=[https://archive.org/details/journalroyalagr03murrgoog/page/n430 388]–}}</ref><ref name="LloydMitchinson2012">{{cite book|author1=John Lloyd|author2=John Mitchinson|author3=James Harkin|title=1,227 QI Facts To Blow Your Socks Off|url=https://books.google.com/books?id=uZaYmyvrY34C&pg=PT44|date=30 October 2012|publisher=Faber & Faber|isbn=978-0-571-29795-5|pages=44–}}</ref><ref name="DayMcNeil2002">{{cite book|author1=Lance Day|author2=Ian McNeil|title=Biographical Dictionary of the History of Technology|url=https://books.google.com/books?id=FmoTeX3aGl4C&pg=PT206|date=11 September 2002|publisher=Routledge|isbn=978-1-134-65019-4|pages=206–}}</ref> document that English engineers Richard Clyburn and [[Edwin Beard Budding]] presented some influential new designs in 1842 and 1843. The one by Clyburn had the form of thumbwheel screw with [[worm drive|worm]]-on-[[rack gear|rack]] arrangement that would later be the most famous via subsequent adaptations. Improvements followed. In 1885 Enoch Harris received US patent 326868<ref>{{US patent|326868}}</ref> for his spanner that permitted both the jaw width and the angle of the handles to be adjusted and locked.

One of the most widely known forms of adjustable wrench in the 21st century is an improved version of the Clyburn type; it was developed in 1891–1892. The Swedish company [[Bahco]] attributes its invention to [[Johan Petter Johansson]],<ref name=BAHCO>{{Cite web|url=http://www.bahco.com/en/about/|title=About Us {{!}} BAHCO|website=www.bahco.com|access-date=2016-11-04}}</ref><ref name="bahco"/> who in 1892 received a Swedish [[patent]] for it.<ref>{{cite web |url=http://www.datamp.org/patents/displayPatent.php?pn=4066&id=57764 |title=SE Patent: SE-4,066 Stallbar skrufnyckel|last=Johansson|first=Johan Petter|date=May 11, 1892 |website=Directory of American Tool and Machinery Patents}}</ref><ref name="Bergh2014">{{cite book|author=Andreas Bergh|title=Sweden and the Revival of the Capitalist Welfare State|url=https://books.google.com/books?id=60kjBAAAQBAJ&pg=PA11|date=31 July 2014|publisher=Edward Elgar Publishing|isbn=978-1-78347-350-2|pages=11–}}</ref> In Canada and the United States, this type is often known as a Crescent wrench owing to widespread [[generic trademark|genericization]] of the brand name<ref name="gc">{{cite web |url= https://www.genericides.org/trademark/crescent-wrench|title= Has crescent wrench become a generic trademark?  |access-date= April 29, 2021 |website= genericides.org |date= 12 January 2020 }}</ref> of the company that held the original 1915 U.S. patent for this type ({{US patent|1133236A}}), the Crescent Tool Company. (The [[Crescent (brand)|Crescent brand]] is now owned by the [[Apex Tool Group]]). As Geesin 2015 documents,<ref name="Geesin-2015"/> the worm-on-rack type (regardless of which terminology is used to name it) was invented in Britain,<ref name="Geesin-2015"/> and later popularized in Scandinavia via the Bahco/Johansson improvement, before its manufacture in the United States was patented. The Bahco/Johansson/Crescent category (regardless of which terminology is used to name it) became so dominant in the 20th century that in North America, the very term ''adjustable wrench'' usually elicits the meaning of this type in general usage today, unless another type is specified. In Australia it is sometimes referred to as a "shifting spanner" or its abbreviated form of "shifter".<ref name="shifter" />

[[Monkey wrench]]es are another type of adjustable spanner with a long history; the origin of the name is not entirely clear, but Geesin reports that it originated in Britain with a fancied resemblance of the wrench's jaws to that of a monkey's face, and that the many convoluted folk etymologies that later developed were baseless.<ref name="Geesin-2015"/> Before the Bahco/Johansson/Crescent type became widespread in the United States, during the industrial era of the 1860s to the 1910s, various monkey wrench types were the dominant form of adjustable wrench there.

Another popular type of adjustable spanner has a base and jaws that form four sides of a hexagon, and is therefore particularly suited for hexagonal nuts ("hex nuts") and hexagonal headed ("hex head") [[List of screw drives#Hex|cap screws]] and bolts.

In some parts of Europe, adjustable spanners are often called a Bahco,<ref name="bahco">[http://www.bahco.com/files/Leaflet%20Adjustable%20Wrenches_ijqrefqqkcekocbournjsajpr.pdf Swedish Bahco leaflet about the development history of adjustable spanners (including photos)] {{webarchive |url=https://web.archive.org/web/20061015183634/http://www.bahco.com/files/Leaflet%20Adjustable%20Wrenches_ijqrefqqkcekocbournjsajpr.pdf |date=October 15, 2006 }}</ref><ref name="gc2">{{cite web |url= https://www.genericides.org/trademark/bahco|title= Has bahco become a generic trademark?  |access-date= April 29, 2021 |website= genericides.org |date= 12 January 2020 }}</ref> owing to genericization of the name of the Bahco/Johansson type. In Denmark, this type of spanner is commonly referred to as a "svensknøgle", which basically translates to Swedish key. The Swedes themselves call the key "skiftnyckel", which is translated into adjustable key (shifting key).<ref>''Basic Swedish: A Grammar and Workbook'' {{ISBN|1-351-16966-1}} p. 177</ref> In Australia, adjustable spanners are also referred to as "shifters". In Spain, this kind of spanner is commonly called "llave inglesa", which means literally English key. Remarking the difference with the pipe wrench, also adjustable, in Spain this one is called "grifa", and it does not have any accurate translation.<ref name="shifter">{{Cite CD.com|shifting spanner}}</ref>