| 摘要 |
<p>A buoyancy float (1) which comprises a hollow inflatable body (2) of a blow moulded plastics material is provided. Adjacent each end of the body member (2), there is a pair of spaced-apart anchorages (7) on one end, together with a handle (8) and on the other end, there is a further pair of anchorages (7) and a spigot 9 in which is mounted a one way valve (not shown). The one way valve is threaded and is screwed into the spigot (9) before the plastics material has cooled so that the one way valve cuts its own thread in the plastics material. <IMAGE></p> |
