| 摘要 |
<p>PURPOSE: To secure certain blocking by arranging an outer plate which has a gas passage located on an inflatable body around an aperture, and a flat inner plate which has a center bore hole arranged inside the inflatable body on an upper side of the aperture. CONSTITUTION: An inflatable body has an aperture 2, while the aperture 2 is closed by a valve 3. The valve 3 has an outer plate 4 positioned around the aperture 2. A gas passage 5 is formed on the opposite side of the aperture 2. An inner plate 6 is arranged inside the inflatable body 1 together with a valve film 7 composing a valve body. The inner plate 6 has a center bore hole 8 located around a gas inlet 9 formed on the valve film 7. The valve film 7 is pressed against a closing circle 11 arranged on a surface 10 of the outer plate 4 at its center valve part with the small internal excessive pressure. The aperture 2 of the inflatable body 1 is closed and the gas passage 5 is blocked between the circle 11 and the valve film 7.</p> |
