| 摘要 |
<p>A net (28) is yieldably supported in an elevator shaft (22) to permit a controlled, decelerated descent of an object (26) falling down the shaft (22). The net (28) is automatically closed and maintained in a closed state by closure rings (80,82) that slide along tethers (58,60,62,64) attached to the net (28). <IMAGE></p> |
