Abstract: A reusable packaging system is disclosed in which a series of thermoformed trays are used to mount six spider type office chair bases. Three bases are mounted in an inverted position on the tray and three bases are mounted upright. A stack of load trays may be constructed with the bottom-most tray fastened to a standard pallet. The stack is plastic wrapped and shipped. After unloading, empty trays may be stacked in a nested arrangement and returned for reuse making for a simple, reliable and inexpensive system.

Abstract: A height adjustment cylinder for use with a desk chair, where the cylinder is simple, reliable and easily assembled with the chair. The cylinder includes a piston shaft which has a threaded region that is of constant diameter or straight walled, and the threaded region includes a high load helical thread.