| 摘要 |
The muff (1) end turned towards a wall (2) is formed with one or more sprung tongues (4) under which is located a deepened part (5) through which the tongues (4) spring through the wall (2) aperture. The tongues then spring outwards locking the muff (1) in the wall. A lege (6) prevents the muff axial movement in the opposite direction, and/or sprung tongues (4) are alternately positioned towards one another. This allows the muff to be inserted into the wall opening from both sides with the wall located in an alternating manner between the counterposed tongue (4) ends. The deepened part (5) under the locking tongues (4) contains one or more intermediary walls which permit the tongues (4) to be set back into the locking position, and reinforced them. (Provisional Basic advised 85/01) |
