| 摘要 |
A sealing ring of the kind which is adapted to be moulded into a socket of concrete pipe at an inner, substantially cylindrical surface of the socket is provided with a device for preventing positional changes of the sealing ring on a portion of the mould for moulding the concrete pipe, on which portion the sealing ring is tensioned during the supply of concrete to the mould. This device is constituted by engagement means (24, 26) adapted to prevent or obstruct sliding of surfaces of the sealing ring contacting each other. <MATH> |
