The Zip Fastener
In the 19th century most of the garments
that people wore were fastened by a great many hooks, eyes, buttons or
laces. The inventors at the time tried to develop a better way of doing
Dr.Sundack, a Swedish/American, patented a slide fastener in 1914. In
1931 the patent expired allowing anybody to use the original design. Zips
have become all-purpose. They are made all over the world and can be found
in most items of clothing.
A Zip-Fastener consists of two chains of metal or plastic teeth attached
to a strip of fabric. Each chain has many teeth, each one with a small
projection which fits into a recess in the opposite chain.