| 摘要 |
Arrangement for electrical box 10 of plastic for securing the box in a through opening 14 made to fit the outer contour of the box in a wall or ceiling board 15, with the box inserted in the opening from the back of the board and the mouth of the box placed essentially level with the front of the board. The arrangement consists of a plastic ring 16 which is slid axially onto the box and is fixed in an axial position on the box by contact between shoulders on the ring and reinforcing flanges 12, 13 arranged around the outside of the box in a known way. Externally, the ring has ridges or tongues 20, 21 to engage with the edge surface of the opening. <IMAGE> |
