Rotating work stool is supported by column, on which ring is mounted which supports user's feet, ring being attached to tube with slots which engage with studs on column, allowing its height to be adjusted

摘要

The rotating work stool is supported by a column (3), on which a ring (5) is mounted which supports the user's feet. This is attached to a tube (6) with slots (7) which engage with studs on the column, allowing its height to be adjusted.