Abstract: A stabilized oscillating chair has a base means, a column extending upwardly from the base, a seat assembly having bottom, back and arm rest portions, and a yoke assembly supported on the upper portion of the column for roll rotation. The yoke assembly is pivotable for yaw rotation relative to the base, and extends under the arm rests for pivotal connection for pitch rotation of the chair assembly. Roll pivot means are provided between the column and the yoke assembly, and pitch pivot means are provided between the yoke assembly and the arm rests. Pitch bias springs are connected with the pitch pivots to urge the chair assembly to normal attitude and have such resilience as to accommodate maintenance of the seat assembly level when occupied.

Abstract: A pulling tool for removing from a shaft either a rotor, such as a squirrel cage blower rotor, having an axially projecting hub, or a fan having radially projecting blades spaced about and joined at their inner ends to a hub. The tool has a screw for seating against one end of the shaft and a nut threaded on the screw including gripping means for engaging the hub of a rotor on the shaft or behind a fan on the shaft in such a way that the rotor or fan is pulled from the shaft by threading the screw against the shaft.