ABSTRACT
Cog chain was developed in the early 1800s to transmit power or motion between the shafts of treadmills to water elevators, weaving looms, and harvesting machinery. This chain, shown in Figure 1-4, consisted of rectangular cast links connected by looped and riveted iron bands. It became known as cog chain because the links contacted the sprocket tooth, or “cog,” as it was then called. This chain was used to mechanize farm implements, but it broke easily and was difficult to repair in the field.
