| 摘要 |
A diving helmet includes a cylindrical portion with a dome shaped top for the head and neck of a user. An air line is attached to a fitting adjacent the dome shaped top and to one side and rear thereof while a slight glass is held in a protrusion extending forwardly from the cylindrical portion. The cylindrical portion terminates in a rim designed to fit over the shoulders, front chest and rear torso of the user, and the rim is weighted with lead weights. The cylindrical portion dome and rim are preferably formed of fiberglass and in the rim the fiberglass completely surrounds the lead. On the under side of the rim on each side thereof there is attached as by gluing flexible pockets consisting of water inpenetrateable leaves stitched together so that one leaf will remain glued to the bottom of the rim while the other leaf is free to open under the pressure of air within the helmet when it is not in use but to close against the other leaf when contacted by the shoulders of a user. The leaves increase the volume of air within the helmet when not in use to provide floatation, but the volume is decreased when in use so that the helmet will remain in place without the necessity of straps.
|
