what products use parallel motion linkage
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In very crude terms, rotary motion is round & round, reciprocating motion is back & forth. A piston engine has both kinds of motion. The crankshaft displays rotary motion, the pistons display reciprocating motion. The camshaft displays rotary motion, the valves display reciprocating motion. Out on the suspension, the wheels display rotary motion and the shock absorbers display reciprocating motion. (One might say the shocks don't display "true" reciprocating motion because they're not CONSTANTLY in motion, but that one drives on better roads than they have here!)
Type your answer here...When the motion between the elements,forming a pair is such that the constrained motion is not completed by itself,but by some other means,then the motion is said to be successfully constrained motion
The Cam
The crankshaft and connecting rod (or piston rod).
The scotch yoke is a mechanism that reciprocates motion and converts the horizontal motion of a bar that is constantly sliding into a rotational motion. This device is commonly used to control valve actuators that can be found in gas pipelines.