| 摘要 |
Grating (1) for floor drains is described, having at least two screws (2) at the edge area of the grating for securing the grating to a waste water bowl (4). Each screw is provided with a washer (7) for securing the screw onto the grating. Each washer is resilient and has a central opening (14) engaging a recess (6) below the screw head (5) and having a diameter which is smaller than the outer diameter of the screw thread (17). |
