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A synchrotilt chair includes a base, a back, a seat, and a pair of parallel links pivoted to a rear of the base and to a bottom of the back to form a four-bar linkage arrangement. A spring arrangement includes leaf springs that extend between each link and the base to bias the link and in turn the b

A synchrotilt chair includes a base, a back, a seat, and a pair of parallel links pivoted to a rear of the base and to a bottom of the back to form a four-bar linkage arrangement. A spring arrangement includes leaf springs that extend between each link and the base to bias the link and in turn the back and seat toward an upright position, with the back and seat pivoting with a synchronous motion upon recline of the back. The base, the back, the seat, and the links are shaped to receive identical chairs along a stacking direction to form a densely nested stacked arrangement for compact storage. The base has a distinctive horizontal U-shaped mid-frame structure defining a plurality of corners, and further having up legs and down legs extending upwardly and downwardly, respectively, from each of the corners, with the pair of links attached to the two rearmost ones of the up legs. The base (and also separately the back and the seat structures) are injection molded as single pieces from a reinforced polymeric material in a manner that provides a lightweight, yet surprisingly rigid and sturdy construction. Armrests are pivoted to the back and have a shape configured to allow nested stacking while also providing excellent comfort, durability, and style.

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1. A chair comprising:a base; a seat pivoted to the base; a back pivoted to the seat; an upwardly extending link pivoted to a rear of the base at a lower pivot and to a bottom of the back at an upper pivot; the base, the seat, the back, and the link defining a linkage arrangement where, when the bac

1. A chair comprising:a base; a seat pivoted to the base; a back pivoted to the seat; an upwardly extending link pivoted to a rear of the base at a lower pivot and to a bottom of the back at an upper pivot; the base, the seat, the back, and the link defining a linkage arrangement where, when the back is reclined at a first angular rate, the seat rotates at a second angular rate in synchronous motion with the back; and an energy device operably connected to the linkage arrangement and biasing the back toward an upright position.