| 摘要 |
A central shaft is arranged for positioning through an opening within a vessel hull, with the central shaft including first and second collars spaced to slidably mount a second collar, wherein a first collar is positioned in adjacency relative to a first end of the shaft, with the first collar having a plurality of positioning legs pivotally mounted to the first collar, and the positioning legs each including a link pivotally mounting each positioning leg to the second collar. A central mounting web includes a pneumatic chamber for effecting a fluid-tight sealing relationship against the hull, with the mounting web including the central shaft directed therethrough, having an externally threaded portion that threadedly receives a lock collar. A pull handle directed through the shaft in adjacency to the lock collar permits pivoting in an over-center relationship of the positioning legs relative to the first collar to permit the positioning and subsequent replacement and removal of the apparatus relative to the ship hull.
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