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chains A roller chain is a development of the block chain in
which the block is replaced by two side plates, a pair of
bushings, and rollers. (See Figure 3.) This type of chain is
used on bicycles and is adaptable to many other needs, from
small-strand drives for microfilm projectors to multiple-strand
chains for heavy-duty service in oil-drilling equipment. Roller
chains are assembled from pin links... use in bicycles ...drives
to lower the pedals and the rider. These were called safety
bicycles. Chain-driven rear wheels were used on tricycles and
prototype bicycles during the 1870s. Hans Renold invented the
bush roller chain in Manchester, England, in 1880. This improved
reliability and facilitated development of the safety bicycle.
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