| 摘要 |
The invention relates to a rolling device for chairs, comprising: a casing (2) which can be built into the lower end of the corresponding foot of a chair and which is provided with an opening at the lower end thereof; a sphere (1) disposed inside the casing (2) such that it can rotate and move longitudinally between a non-operating position in which it remains inside the casing and an operating position in which is extends beyond the opening in the casing (2); and a separator (3) which is pressed by a spring (4) located inside the casing (2) and which maintains the sphere (1) in the position in which is extends beyond the opening in the casing (2). |
