Question

why the four-bar chain is considered a basic chain mechanism

Answer 1

Answer:

Four bar chain mechanism is the most common type of mechanism. ... The links in the mechanism can have any length but they have to follow a certain law called Grashof's law. Grashof's law says that the sum of the shortest and the longest four-bar mechanism should be less than the sum of the length of the other two links.

Answer 2

• It is one of the most useful and most common mechanisms.
• In this mechanisms, the link which can make complete rotation is known as crank.
• The link which oscillates is known as rocker or lever.
• The link connecting these two is known as coupler.
• In four bar chain, the relative motion is completely constrained. The four bar chain is considered to be the basic chain because there are many practical mechanisms which are absed on the four bar chain.
• Four bar linkages can be used for many mechanical purposes, including to: convert rotational motion to reciprocating motion, For example- pumpjack convert reciprocating motion to rotational motion.
• The kinematic chain is a combination of four or more kinematic pairs, such that the relative motion between the links or elements is completely constrained.
• The simplest and the basic kinematic chain is a four bar chain or quadric cycle chain.

Hence, four bar chain is considered a basic chain mechanism.

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