| 摘要 |
An inflatable device (10) has a vent (42) for enabling venting of inflation fluid. A patch (50) covers the vent (42). A release thread (70) releasably secures the patch (50) to the device to close the vent (42). A holding mechanism (82) has a first condition in response to sensor means (30) sensing a condition requiring venting of inflation fluid, and a second condition when venting is not required. The holding mechanism (82) when in the first condition holds the release thread (70) so that at least a portion of it pulls away from the patch (50) and the device (10), when the device inflates, thereby releasing the patch to open the vent (42). The holding mechanism (82) when in the second condition releases the release thread (70) for movement with the patch (50) in a direction away from the holding mechanism, when the device (10) inflates.
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