Four Bar Chain Apparatus
Product Code : EL-AMLE-10624
Quick Answer: The Four Bar Chain Apparatus is an experimental unit built around a drive disk with a crank and coupling and an output disk with a rocker, used to demonstrate how a four-bar pivot gear converts a uniform continuous rotation into a non-uniform rotation or oscillation. Angular scales on both the input and output discs, together with a crank pin that can be located at different radii, allow students to adjust the crank radius, oscillation radius and coupling length and investigate the crank-rocker mechanism, the double rocker mechanism and the double crank. All elements are mounted on a base plate fitted with two handles for easy carrying and stacking.
Four-bar linkages are used to convert a uniform continuous rotation into a non-uniform rotation or oscillation. The experimental unit comprises the drive disk with the crank and coupling and the output disk with the rocker, and the apparatus has a disc with an angular scale that is used to measure the exact input angle; the crank pin can be located at different radii on the disc. The four-joint link is a four-bar pivot gear that converts rotary motion into oscillating motion, with its elements connected to each other via pivot joints. The positions of these pivot joints can be varied to adjust the crank radius, oscillation radius and coupling length. The drive disk can be driven by the crank, with the input angle adjusted using the drive disk and read on an angle scale integrated into the base plate, while the output angle is read at the angle scale on the output disk. The elements are mounted on a base plate, and two handles make it easy to carry and stack the unit. The unit can be used to investigate the crank-rocker mechanism, the double rocker mechanism and the double crank.
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Last Updated: September 2026
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