The relation l = 2/3(j+2) apply to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to

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Simple Mechanisms topics: Simple mechanisms, kinematic links and chains, links types, mechanism, grublers criterion, single and double slider crank chain inversions, kutzbach criterion applications, kinematics chains and its types. A simple mechanism is a mechanical device that uses mechanical advantage to multiply force and change the direction or magnitude of a force. A mechanism with four links is considered a simple mechanism.  Here are some examples of simple mechanisms: Lever: A rigid body that can rotate on a point on itself. A lever is a bar or board that rests on a support called... Show more

The relation l = 2/3(j+2) apply to kinematic chains in which lower pairs are used. This may be used to kinematic chains in which higher pairs are used, but each higher pair may be taken as equivalent to