Scotch Yoke
Second Inversion (Scotch Yoke)
If any of the slide-blocks of the first inversion is fixed, the second inversion of the double-slider-crank chain is obtained as shown in Figure (a). This mechanism gives SHM. Its early application was on steam pumps, but it is now used as a mechanism on a test machine to produce vibrations. It is also used as a sine-cosine generator for computing elements Figure [(a) and (b)] shows a sketch of scotch yoke mechanism.
A Scotch-Yoke mechanism is used to convert the rotary motion into a sliding motion. As the crank 3 rotates, the horizontal portion of the link 1 slides or reciprocates in the fixed link 4.
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