| 摘要 |
The cover (3) of flexible thermoplastic material is anchored to the ground by a flexible, water filled tube. There is a zip fastener (7) with one toothed side (11) attached to the water filled tube (4), the other toothed side (13) is attached to the base (17) of the cover (3). The zip is inserted by passing a lace through eyelets near the base (17) of the cover (3) and through a strip of film (12) attached to the water filled ballast (4). The zip consists of a single length running from one side (9) of the door (8) to the other side (10) of the door. The zip has two sliders (14) running in opposite directions. Two zips may be used, leaving a section of the cover fixed directly to the base (4). The upper edge of a strip of film (18) is attached to the base (17) of the cover (3) and is pressed against the zip by the pressure of the air used to inflate the cover.
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