| 摘要 |
<p>The sealing ring (2) rests with its rear side against the rigid pressure ring (4), the latter pressing the sealing ring with sprung location with its front side against a ring-shaped part around the ear of a user. In its unloaded state, the sealing ring front side has a concave, vaulted shape; permitting a tight fit against the head of a user along at least the major part of its front surface. It has a virtually rectangular cross-section along its length, with low height in relation to its width.</p> |
