The Slider Crank Chain
When one of the turning pairs of a four-bar chain is replaced by a sliding pair, it becomes a single slider crank chain or simply a slider-crank chain.
In fact, the slider-crank mechanism, which has a well-known application in engines, is a special case of the crank-rocker mechanism. Notice that if rocker 3 in Fig. (a) is very long, it can be replaced by a block sliding in a curved slot or guide as shown. If the length of the rocker is infinite, the guide and block are no longer curved.
Rather they are apparently straight, as shown in Fig. (b), and the linkage takes the form of the ordinary slider-crank mechanism.
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