CHAIR BASE HUB WITH MOLDED RING AND OPPOSITELY-DIRECTED TAPERS

摘要

A hub is provided for the base of a swivel-type chair in which the hub includes a passage forming an interior wall which receives and retains therein a gas cylinder joining the base with a seat of the chair. The interior wall of the hub is formed with an upper portion, a ring portion, and a lower portion. The upper portion slopes downwardly and inwardly at a first taper angle relative to a longitudinal axis of the gas cylinder and the passage. The ring portion has an upper segment sloping downwardly and inwardly from the upper portion at a second taper angle greater than the first taper angle, a medial segment extending vertically from the upper segment, and a lower segment sloping downwardly and outwardly from the medial segment at a third taper angle less than the second taper angle but greater than the first taper angle. The lower portion slopes downwardly and outwardly from the lower segment of the ring portion at a fourth taper angle relative to the longitudinal axis of the gas cylinder and the passage and slightly greater than the first taper angle. The upper portion cooperates with a first similarly-shaped portion of the gas cylinder to prevent wobbling of the cylinder relative to the base. The upper segment of the ring portion engages a second similarly-shaped portion of the gas cylinder to preclude longitudinal movement of the cylinder relative to the base.