| 摘要 |
Accident protection device (1) to be mounted in a mainly vertical well casing (2), including one or more protection means (5) extending radially, diagonally or in another way across the well casing (2). The protection means (5) are joined with one or more adjusting means (7, 8) or are constituted by portions expanding at their mounting or loading, by means of which the accident protection means (5) can be attached to the inner wall of the well casing (2). |
