| 摘要 |
The device has two bent deflecting passages completely provided in section in four deflecting assemblies (120b). The deflecting passages connect a rolling surface (31a) with a return passage of a base and a longitudinal section such that a rolling body runs in an endless manner. The deflecting assemblies are arranged at the base such that a rolling surface part (31) stays in alignment contact with the deflecting assemblies. The surface part has two flat longitudinal front surfaces (31b), where the return passage is completely closed by the base. |
