Theory of Machine
Open pairs are those which have

Elements of pairs not held together mechanically
Two elements that permit relative motion
Surface contact between the two elements when in motion
Point or line contact between the two elements when in motion

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Theory of Machine
Pitch point on a cam is

Any point on pitch curve
Any point on pitch circle
The point on cam pitch curve having the maximum pressure angle
The point on cam pitch curve having the minimum pressure angle

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Theory of Machine
In a single slider crank chain

One is a turning pair and three are sliding pairs
Two are turning pairs and two are sliding pairs
Each of the four pairs is a turning pair
Three are turning pairs and one is a sliding pair

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