| 摘要 |
Flexible bushing for supporting a pipe conduit on each side of a wall having an opening for receiving the bushing. The bushing includes an inner component forming a pipe portion adapted for mounting the pipe conduits coaxially thereof, an outer fastening component secured in gas-tight fashion to the wall at the opening and an annular rubber element forming a gas-tight connection between the inner and outer components. Annular protective flanges are associated with either the inner or outer component and under normal temperature conditions define an open slot between the inner and outer components and the annular rubber element. A barrier creator borders the slot and is adapted to be activated by the action of heat to close off the slot in a flame-protecting and, preferably, gas-tight manner.
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