| 摘要 |
The roller has a casing (10) for fixing to an external component, and a wheel (14) attached to it by an axle (12). The casing is divided in two. It consists of an upper part (16) and a lower part (18) pivoted to it which guides the wheel. The lower part is sprung by a spring-elastic return element (30). The lower part may be at an angle to the upper part. |
