Four-bar linkage

Types of four-bar linkages, s = shortest link, l = longest link.

A four-bar linkage, also called a four-bar, is the simplest movable closed chain linkage. It consists of four bodies, called bars or links, connected in a loop by four joints. Generally, the joints are configured so the links move in parallel planes, and the assembly is called a planar four-bar linkage.

单词	Four bar linkage
释义	Four bar linkage 英语百科 Four-bar linkage A four-bar linkage, also called a four-bar, is the simplest movable closed chain linkage. It consists of four bodies, called bars or links, connected in a loop by four joints. Generally, the joints are configured so the links move in parallel planes, and the assembly is called a planar four-bar linkage.
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Four bar linkage

Four-bar linkage