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Pull the sides of a closed zip and it won't budge, yet no single pair of teeth is holding anything. Here's how a zipper actually works: cup-shaped teeth staggered by half a tooth, a chain that locks itself, a Y-shaped slider that meshes about 300 teeth a second, why zips split (and the gentle fix), and how a rubber boot gave the fastener its name. Chapters 0:00 The joint that holds 0:49 Two tapes and a row of cups 1:43 Why the row holds 2:37 The slider is a wedge 3:27 Why zips split, and the fix 4:28 Twenty-two years: Howe and Judson 5:30 Sundback's zipper and his machine 6:34 A name from a boot Sources • G. Sundback, US 1,219,881 "Separable fastener" (filed 27 Aug 1914, granted 20 Mar 1917) — https://patents.google.com/patent/US1219881A/en • G. Sundback, US 1,243,458 "Separable fastener" (1917) — https://patents.google.com/patent/US1243458A/en • G. Sundback, US 1,060,378 (hook-and-eye type, 1913) — https://patents.google.com/patent/US1060378A/en • G. Sundback, US 1,467,015 "Method and machine for making fasteners" (1923) — https://patents.google.com/patent/US1467015A/en • W. L. Judson, US 504,038 "Clasp locker or unlocker for shoes" (filed 7 Nov 1891, granted 29 Aug 1893) — https://patents.google.com/patent/US504038A/en • E. Howe Jr., US 8,540 (25 Nov 1851) — https://patents.google.com/patent/US8540A/en • YKK, automatic locking slider patent US 4,679,281 — https://patents.google.com/patent/US4679281A/en • Robert Friedel, "The History of the Zipper", Invention & Technology 10(1), 1994 — https://www.inventionandtech.com/node/85706 • National Inventors Hall of Fame, Gideon Sundback — https://www.invent.org/inductees/gideon-sundback • B. F. Goodrich Co. v. Kenilworth Mfg. Co., 40 F.2d 121 (C.C.P.A. 1930) (trademark Reg. No. 197,090, 7 Apr 1925) — https://static.case.law/f2d/40/cases/0121-01.json • Smithsonian NMAH, Original B.F. Goodrich Zipper Boot — https://americanhistory.si.edu/collections/object/nmah_860362 • JSTOR Daily, "How WWI Made the Zipper a Success" — https://daily.jstor.org/how-wwi-made-the-zipper-a-success/ • worldsfairchicago1893.com on the 1893 World's Fair claim — https://worldsfairchicago1893.com/2022/01/16/which-of-the-6-everyday-inventions-debuted-at-1893-worlds-fair/ • YKK Corporation, history — https://www.ykk.com/english/corporate/group/outline.html • YKK Americas, pin-lock vs auto-lock sliders — https://ykkamericas.com/difference-between-pin-lock-sliders-and-auto-lock-sliders/ • Forbes, "Zipping Up the World", 24 Nov 2003 (45% market share, a 2003 figure) — https://www.forbes.com/global/2003/1124/089.html • iFixit, Coil Zipper Diagnosis — https://www.ifixit.com/Guide/Coil+Zipper+Diagnosis/19454 Notes • Tooth spacing (2.54 mm, 1.27 mm) and "about 300 teeth a second" are our arithmetic from ~10 teeth per inch and a 20 cm zip closed in half a second. • The 1893 World's Fair debut is widely repeated but hard to confirm in the fair's own records. • The "Zipper" trademark covered boots and overshoes, not the fastener. It was the Goodrich company, not B. F. Goodrich himself (d. 1888), that named it. • Sources differ on exactly where to squeeze a worn slider; go gently, a little at a time. • Patent drawings are US patents, public domain. All other visuals are drawn schematics.

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