| 摘要 |
The ring flange (6) has a blunt conical shape and on it are teeth (7) which extend outwards from the flange periphery. The extending parts of the individual teeth have front and rear edges, the inner and outer surfaces of which run together into a free end or point. - The teeth (7) in the area of their points have at least the same thickness, reckoned as the distance between the inner and outer surfaces, as they have in the area of the ring flange (6) periphery. The teeth comprise plates (7) which have the same thickness along the whole of their extent, and amounting pref. to around 20 mm. |
