Four-bar linkage

Rarity: Common

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At a glance

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Notion

Domain

Science and technology

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What Wikipedia says

In the study of mechanisms, a four-bar linkage, also called a four-bar, is the simplest closed-chain movable linkage. It consists of four bodies, called bars or links, connected in a loop by four joints.

Excerpt from the Wikipedia article “Four-bar linkage”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Alberthyang, CC BY-SA 3.0, via Wikimedia Commons.