| 摘要 |
<p>A membrane (1) made of flexible material, which has a cover surface (2) in the form of a truncated cone with fixture flanges (7) at its edge (6). These flanges are disc shaped, and located in relation to the axis (5) of vertical membrane surfaces. Alternatively, the flanges are constituted by prolongations of the membrane cover surface and each take the form of a truncated cone, or the uppermost flange can be a membrane prolongation and truncated conical in form, with the lower flange ring shaped. The wall thickness of the membrane is not uniform. Also the cover surface of the membrane can be in the form of a truncated cone with arched ends.</p> |
